WO2015100651A1

WO2015100651A1 - Registration activation method, device and system for orthogonal frequency division multiplexing passive optical network

Info

Publication number: WO2015100651A1
Application number: PCT/CN2013/091190
Authority: WO
Inventors: 叶飞
Original assignee: 华为技术有限公司
Priority date: 2013-12-31
Filing date: 2013-12-31
Publication date: 2015-07-09
Also published as: CN105264795A; CN105264795B

Abstract

　Provided are a registration activation method, device and system for an orthogonal frequency division multiplexing passive optical network. A registration activation method for an orthogonal frequency division multiplexing passive optical network, comprising: sending, by an optical line terminal, a downlink training sequence to an authenticated optical network unit; receiving, by the optical line terminal, a downlink bit bearer table of the optical network unit and an uplink training sequence which are sent by the optical network unit, the downlink bit bearer table of the optical network unit being calculated by the optical network unit according to the downlink training sequence; calculating, by the optical line terminal, an uplink bit bearer table of the optical network unit according to the uplink training sequence; calculating and updating, by the optical line terminal, a system downlink bit bearer table and a system uplink bit bearer table according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit, and sending the system downlink bit bearer table and the system uplink bit bearer table to the optical network unit, so that the optical network unit updates the system downlink bit bearer table and the system uplink bit bearer table.

Description

Orthogonal frequency division multiplexing passive optical network registration activation method, device and system

Embodiments of the present invention relate to the field of optical communications, and in particular, to a method, an apparatus, and a system for registering activation of an orthogonal frequency division multiplexing passive optical network. Background technique

Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation technology that is applied to the field of optical communication to generate Optical Orthogonal Frequency Division Multiplexing (OOFDM) technology. . OFDM-PON is a passive optical network (PON) based on OOFDM technology.

The OFDM-PON consists of an optical line terminal (OLT) on the central office, an optical network unit (ONU) on the user side, or an optical network terminal (ONT) and an optical distribution network (Optical Distribution Network). , ODN) Composition, generally, the ONU and ONT are collectively referred to as ONUs.

OFDM-PON mainly has single-wavelength OFDM-PON, Nyquist-based OFDM-PON, and Wavelength Division Multiplexing (WDM)-based multi-wavelength OFDM-PON. Network Architecture.

Since there is a difference between each subcarrier in the OFDM-PON system, when the OLT and the ONU use different subcarriers to transmit data, the bit bearer value (the maximum number of bits that can be carried) of each subcarrier is different, and the current OFDM- In the PON system, after the ONU is registered and activated in the OLT, the OLT does not know the bit bearer value of each subcarrier when transmitting data with the ONU, and the link capacity of the OFDM-PON system is not maximized. Summary of the invention

Embodiments of the present invention provide a method, an apparatus, and a system for registering and activating an orthogonal frequency division multiplexing passive optical network for maximizing the link capacity of an OFDM-PON system.

The first aspect provides a method for registering activation of an orthogonal frequency division multiplexing passive optical network, including: The optical line terminal sends a downlink training sequence to the optical network unit that has passed the authentication; the optical line terminal receives a downlink bit bearer table and an uplink training sequence of the optical network unit that are sent by the optical network unit, where the optical network unit The downlink bit bearer table is calculated by the optical network unit according to the downlink training sequence;

The optical line terminal calculates an uplink bit bearer table of the optical network unit according to the uplink training sequence;

The optical line terminal calculates and updates the system downlink bit bearer table and the system uplink bit bearer table according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit;

The optical line terminal sends the system downlink bit bearer table and the system uplink bit bearer table to the optical network unit, so that the optical network unit updates the system downlink bit bearer table and the system uplink bit bearer table.

In a first possible implementation manner of the first aspect, the optical line terminal calculates an uplink bit bearer table of the optical network unit according to the uplink training sequence, including:

And calculating, by the optical line terminal, a signal to noise ratio of each uplink subcarrier that receives the uplink training sequence according to the uplink training sequence;

The optical line terminal calculates an uplink bit bearer table of the optical network unit according to a signal to noise ratio of each uplink subcarrier that receives the uplink training sequence.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner, the optical line terminal is configured according to a downlink bit bearer table of the optical network unit and an uplink of the optical network unit The bit bearer table calculates and updates the system downlink bit bearer table and the system uplink bit bearer table, including Γ

The optical line terminal uses the smaller one of the bit bearer values of the downlink subcarriers of the downlink bit bearer table of the system and the downlink bit bearer table of the optical network unit as the bit bearer value of the downlink subcarrier, to update the location System downlink bit bearer table;

The optical line terminal uses the smaller one of the bit bearer values of the uplink subcarriers of the uplink bit bearer table of the system and the uplink bit bearer table of the optical network unit as the bit bearer value of the uplink subcarrier, to update the location The system uplink bit bearer table is used; or the optical line terminal uses the uplink bit bearer table of the optical network unit together with the uplink bit bearer table of other optical network units as the system uplink bit bearer table. With reference to the first aspect to any possible implementation of the second possible implementation manner of the first aspect, in a third possible implementation manner, the optical line terminal sends the system downlink to the optical network unit The bit bearer table and the system uplink bit bearer table, after the optical network unit updates the system downlink bit bearer table and the system uplink bit bearer table, further includes:

Transmitting, by the optical line terminal, a second ranging request message to the optical network unit;

The optical line terminal receives the second ranging response message sent by the optical network unit to obtain a second ranging result.

With reference to the first aspect to any possible implementation manner of the third possible implementation manner of the first aspect, in a fourth possible implementation manner, the optical line terminal sends downlink training to the certified optical network unit Before the sequence, it also includes:

The optical line terminal sends a registration request message to the optical network unit by using a default downlink bit bearer table;

The optical line terminal receives a registration response message sent by the optical network unit by using a default uplink bit bearer table, where the registration response message includes a sequence number of the optical network unit;

The optical line terminal determines that the optical network unit represented by the serial number has passed the authentication and allocates an optical network unit identifier to the optical network unit represented by the serial number;

The optical line terminal transmits the optical network unit identifier to the optical network unit.

With reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation, the optical line terminal determines that the optical network unit represented by the serial number has been authenticated and is an optical network represented by the serial number. The unit assigns an optical network unit identifier, including:

And if the optical line terminal determines that the optical network unit represented by the serial number is configured and activated, the optical line terminal determines that the optical network unit represented by the serial number has passed the authentication and is the light represented by the serial number. The network element assigns the optical network unit identity.

With reference to the fourth possible implementation manner of the first aspect, in a sixth possible implementation, the optical line terminal determines that the optical network unit represented by the serial number has been authenticated and is an optical network represented by the serial number. The unit assigns an optical network unit identifier, including:

And if the optical line terminal determines that the optical network unit represented by the serial number is configured but not activated, the optical line terminal sends an authentication request message to the optical network unit;

The optical line terminal receives an authentication response message sent by the optical network unit, where the authentication response message includes an authentication identifier and/or an authentication password of the optical network unit; If the optical line terminal determines that the sequence number of the optical network unit and the authentication identifier and/or the authentication password of the optical network unit are legal, the optical line terminal determines that the optical network unit represented by the serial number has passed the authentication. And assigning the optical network unit identifier to the optical network unit represented by the serial number.

With reference to the fourth possible implementation manner of the first aspect, in a seventh possible implementation, the optical line terminal determines that the optical network unit represented by the serial number has been authenticated and is an optical network represented by the serial number. The unit assigns an optical network unit identifier, including:

If the optical line terminal determines that the sequence number of the optical network unit is not configured, the optical line terminal allocates a temporary optical network unit identifier to the optical network unit;

Transmitting, by the optical line terminal, an authentication request message to the optical network unit;

Receiving, by the optical line terminal, an authentication response message sent by the optical network unit, where the authentication response message includes an authentication identifier and/or an authentication password of the optical network unit;

And if the optical line terminal determines that the sequence number of the optical network unit and the authentication identifier and/or the authentication password of the optical network unit are legal, the optical line terminal determines that the optical network unit has passed the authentication;

The optical line terminal sends a downlink command to the optical network unit, and releases the temporary network identifier;

The optical line terminal resends the registration request message to the optical network unit; the optical line terminal receives the registration response message retransmitted by the optical network unit, and is an optical network unit represented by the serial number Assigning the optical network unit identity.

With the seventh possible implementation of the first aspect, in an eighth possible implementation, before the optical line terminal sends the authentication request message to the optical network unit, the method further includes:

Transmitting, by the optical line terminal, a third ranging request message to the optical network unit;

The optical line terminal receives a third ranging response message sent by the optical network unit to obtain a third ranging result.

With reference to any one of the possible implementations of the fourth to eighth possible implementations of the first aspect, in the ninth possible implementation, the optical line terminal uses a default downlink bit bearer table to the optical network. The unit sends a registration request message including:

The optical line terminal sends a registration request message to the optical network unit using a default downlink bit bearer table in a default spectrum range or all downlink spectrum ranges or management channels. With reference to the ninth possible implementation manner of the first aspect, in a tenth possible implementation manner, before the optical line terminal receives the first ranging response message sent by the optical network unit, the optical line terminal further includes: the optical line The terminal transmits spectrum allocation information to the optical network unit, so that the optical network unit adjusts the spectrum working range to the target band by adjusting the electrically tunable filter according to the spectrum allocation information.

With reference to the ninth possible implementation manner of the first aspect, in an eleventh possible implementation manner, before the optical line terminal resending the registration request message to the optical network unit, the method further includes: The terminal transmits spectrum allocation information to the optical network unit, so that the optical network unit adjusts the spectrum working range to the target band by adjusting the electrically tunable filter according to the spectrum allocation information.

With reference to any one of the possible implementations of the fourth to eighth possible implementations of the first aspect, in a twelfth possible implementation, the optical line terminal uses a default downlink bit bearer table to the light The network unit sends a registration request message including:

The optical line terminal sends a registration request message to the optical network unit by using a default downlink bit bearer table on all downlink wavelengths or default initial wavelengths or common management wavelengths;

Receiving, by the optical line terminal, the registration response message sent by the optical network unit by using a default uplink bit bearer table, including:

Receiving, by the optical line terminal, the optical network unit, by using an initial uplink bit bearer table, after adjusting the optical tunable transmitter, on any upstream wavelength or an uplink wavelength corresponding to a downlink wavelength that is sent by the optical network unit to send a registration request message. The registration response message includes the serial number of the optical network unit in the registration response message.

With reference to the twelfth possible implementation manner of the first aspect, in a thirteenth possible implementation manner, before the optical line terminal receives the first ranging response message sent by the optical network unit, the method further includes: The optical line terminal allocates an uplink wavelength and a downlink wavelength to the optical network unit;

The optical line terminal transmits wavelength allocation information to the optical network unit to cause the optical network unit to adjust a wavelength of the optical network unit optical transmitter and the optical receiver according to the wavelength allocation information.

With reference to the twelfth possible implementation manner of the foregoing aspect, in a fourteenth possible implementation, before the optical line terminal resending the registration request message to the optical network unit, the method further includes: The line terminal allocates an uplink wavelength and a downlink wavelength to the optical network unit; The optical line terminal transmits wavelength allocation information to the optical network unit, so that the optical network unit adjusts wavelengths of the optical network unit optical transmitter and the optical receiver according to the wavelength allocation information.

A second aspect of the present invention provides a method for registering an OFDM-based passive optical network, comprising: receiving, by an authenticated optical network unit, a downlink training sequence sent by an optical line terminal; the optical network unit according to the downlink training sequence Calculating a downlink bit bearer table of the optical network unit;

The optical network unit sends a downlink bit bearer table and an uplink training sequence of the optical network unit to the optical line terminal, so that the optical line terminal calculates an uplink bit bearer of the optical network unit according to the uplink training sequence. And calculating and updating a system downlink bit bearer table and a system uplink bit bearer table according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit;

The optical network unit receives and updates the system downlink bit bearer table and the system uplink bit bearer table sent by the optical line terminal.

In a first possible implementation manner of the second aspect, the optical network unit calculates, according to the downlink training sequence, a downlink bit bearer table of the optical network unit, including:

The optical network unit calculates, according to the downlink training sequence, a signal to noise ratio of each downlink subcarrier that receives the downlink training sequence;

The optical network unit calculates a downlink bit bearer table of the optical network unit according to a signal to noise ratio of each downlink subcarrier that receives the downlink training sequence.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner, the optical network unit receives and updates a downlink bit bearer table and an uplink bit bearer table sent by the optical line terminal After that, it also includes:

Receiving, by the optical network unit, a second ranging request message sent by the optical line terminal; the optical network unit sending a second ranging response message to the optical line terminal, so that the optical line terminal acquires the second Ranging results.

With reference to the second aspect, the second possible implementation manner of the second possible implementation manner, in the third possible implementation manner, the authenticated optical network unit receives the downlink sent by the optical line terminal Before the training sequence, it also includes:

The optical network unit receives a note sent by the optical line terminal using a default downlink bit bearer table Request message

The optical network unit sends a registration response message by using a default uplink bit bearer table, where the registration response message includes a sequence number of the optical network unit;

Receiving, by the optical network unit, an optical network unit identifier sent by the optical line terminal, where the optical network unit identifier is that the optical network terminal determines that the optical network unit represented by the serial number has been authenticated and is represented by the serial number. The optical network unit is allocated.

With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation, the optical network unit receives an optical network unit identifier that is sent by the optical line terminal, where the optical network unit identifier is the light The line terminal determines that the optical network unit represented by the serial number has been allocated for the optical network unit represented by the serial number after being authenticated, and includes:

Receiving, by the optical network unit, an optical network unit identifier sent by the optical line terminal, where the optical network unit identifier is that the optical line terminal determines that the optical network unit represented by the serial number is configured and activated to be the sequence The number represented by the optical network unit is assigned.

With reference to the third possible implementation manner of the second aspect, in a fifth possible implementation, the optical network unit receives an optical network unit identifier that is sent by the optical line terminal, where the optical network unit identifier is the light The line terminal determines that the optical network unit represented by the serial number has been allocated for the optical network unit represented by the serial number after being authenticated, and includes:

Receiving, by the optical network unit, an authentication request message sent by the optical line terminal, where the authentication request message is sent by the optical line terminal after determining that the optical network unit represented by the serial number is configured but not activated;

The optical network unit sends an authentication response message to the optical line terminal, where the authentication response message includes an authentication identifier and/or an authentication password of the optical network unit;

Receiving, by the optical network unit, an optical network unit identifier sent by the optical line terminal, where the optical network unit identifier determines, by the optical line terminal, a serial number of the optical network unit and an authentication identifier of the optical network unit Or the authentication password is legally assigned to the optical network unit represented by the serial number.

With reference to the third possible implementation manner of the second aspect, in a sixth possible implementation, the optical network unit receives an optical network unit identifier that is sent by the optical line terminal, where the optical network unit identifier is the light The line terminal determines that the optical network unit represented by the serial number has been allocated for the optical network unit represented by the serial number after being authenticated, and includes:

Receiving, by the optical network unit, an authentication request message sent by the optical line terminal, where the authentication is requested The request message includes a temporary optical network unit identifier, where the authentication request message is sent by the optical line terminal after determining that the serial number of the optical network unit is not configured and is not activated;

Receiving, by the optical network unit, a downlink command sent by the optical line terminal, where the offline command is a sequence number of the optical network unit of the optical line terminal and an authentication identifier and/or an authentication password of the optical network unit Sent after legality;

Receiving, by the optical network unit, the registration request message retransmitted by the optical line terminal; the optical network unit resending the registration response message to the optical line terminal; the optical network unit receiving the optical line terminal The optical network unit ID that was sent.

With reference to the sixth possible implementation manner of the second aspect, in a seventh possible implementation, before the optical network unit receives the authentication request message sent by the optical line terminal, the method further includes:

Receiving, by the optical network unit, a third ranging request message sent by the optical line terminal; the optical network unit sending a third ranging response message to the optical line terminal, so that the optical line terminal acquires the third measurement From the result.

With reference to any one of the possible implementation manners of the third to the seventh possible implementations of the second aspect, in an eighth possible implementation, the optical network unit receives the optical downlink terminal using a default downlink bit bearer. The registration request message sent by the table includes:

The optical network unit receives a registration request message sent by the optical line terminal in a default spectrum range or all downlink spectrum ranges or a management channel using a default downlink bit bearer table.

With reference to the eighth possible implementation manner of the second aspect, in a ninth possible implementation, before the sending, by the optical network unit, the first ranging response message to the optical line terminal, the method further includes:

Receiving, by the optical network unit, spectrum allocation information sent by the optical line terminal;

The optical network unit adjusts the spectrum operating range to the target band by adjusting the electrically tunable filter according to the spectrum allocation information.

With reference to the eighth possible implementation of the second aspect, in a tenth possible implementation, before the optical network unit receives the registration request message that is resent by the optical line terminal, the method further includes:

The optical network unit adjusts the spectrum by adjusting the electrically tunable filter according to the spectrum allocation information The range is adjusted to the target band.

With reference to any one of the possible implementation manners of the third to the seventh possible implementations of the second aspect, in an eleventh possible implementation, the optical network unit receives the default downlink bit of the optical line terminal The registration request message sent by the bearer table includes:

Receiving, by the optical network unit, a registration request message sent by the optical line terminal by using a default downlink bit bearer table on all downlink wavelengths or a default initial wavelength or a common management wavelength;

Transmitting, by the optical network unit, a registration response message by using a default uplink bit bearer table, including: the optical network unit adjusting an optically adjustable transmitter, transmitting a registration request message at any upstream wavelength, or with receiving the optical network unit On the corresponding uplink wavelength, the registration response message is sent by using a default uplink bit bearer table, where the registration response message includes the sequence number of the optical network unit.

With reference to the eleventh possible implementation manner of the second aspect, in a twelfth possible implementation, before the sending, by the optical network unit, the first ranging response message to the optical line terminal, Receiving, by the network unit, wavelength allocation information sent by the optical line terminal, where the wavelength allocation information is allocated by the optical line terminal to the optical network unit;

The optical network unit adjusts wavelengths of the optical network unit optical transmitter and the optical receiver according to the wavelength allocation information.

With reference to the eleventh possible implementation manner of the second aspect, in a thirteenth possible implementation manner, before the optical network unit receives the registration request message resent by the optical line terminal, the method further includes:

The optical network unit receives wavelength allocation information sent by the optical line terminal, where the wavelength allocation information is allocated by the optical line terminal to the optical network unit;

A third aspect provides an optical line terminal, including:

a sending module, configured to send a downlink training sequence to the optical network unit that has passed the authentication, and a receiving module, configured to receive a downlink bit bearer table and an uplink training sequence of the optical network unit sent by the optical network unit, where the optical network The downlink bit bearer table of the unit is calculated by the optical network unit according to the downlink training sequence;

a calculation module, configured to calculate an uplink bit of the optical network unit according to the uplink training sequence Bearer table

And an update module, configured to calculate and update a system downlink bit bearer table and a system uplink bit bearer table according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit;

The sending module is further configured to send the system downlink bit bearer table and the system uplink bit bearer table to the optical network unit, so that the optical network unit updates the system downlink bit bearer table and the system Upstream bit bearer table.

In a first possible implementation manner of the third aspect, the calculating module is specifically configured to calculate, according to the uplink training sequence, a signal to noise ratio of each uplink subcarrier that receives the uplink training sequence; The signal to noise ratio of each uplink subcarrier of the sequence calculates an uplink bit bearer table of the optical network unit.

With reference to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner, the updating module is specifically configured to: use the downlink bit bearer table of the system and the downlink of the optical network unit The smaller one of the bit bearer values of the same downlink subcarrier in the bit bearer table is used as the bit bearer value of the downlink subcarrier to update the system downlink bit bearer table; and the system uplink bit bearer table and the optical network unit The smaller one of the bit bearer values of the same uplink subcarrier in the uplink bit bearer table is used as the bit bearer value of the uplink subcarrier to update the system uplink bit bearer table; or the optical line terminal will be the optical network unit The uplink bit bearer table is used together with the uplink bit bearer table of other optical network units as the system uplink bit bearer table.

With reference to any one of the possible implementation manners of the third aspect to the second possible implementation manner of the third aspect, in a third possible implementation, the sending module is further configured to send the first to the optical network unit Second ranging request message;

The receiving module is further configured to receive a second ranging response message sent by the optical network unit to obtain a second ranging result.

With reference to the third aspect to the third possible implementation manner of the third possible implementation manner, in a fourth possible implementation manner, the sending module is further configured to use a default downlink bit bearer table The optical network unit sends a registration request message;

The receiving module is further configured to receive a registration response message that is sent by the optical network unit by using a default uplink bit bearer table, where the registration response message includes a sequence number of the optical network unit, and the optical line terminal further includes: An authentication module, configured to determine an optical network represented by the serial number The unit has been authenticated and assigned an optical network unit identifier to the optical network unit represented by the serial number. The sending module is further configured to send the optical network unit identifier to the optical network unit. With reference to the fourth possible implementation manner of the third aspect, in a fifth possible implementation, the authentication module is specifically configured to determine, if it is determined that the optical network unit represented by the serial number is configured and activated, The optical network unit represented by the serial number has been authenticated and assigned the optical network unit identifier for the optical network unit represented by the serial number.

With reference to the fourth possible implementation manner of the third aspect, in a sixth possible implementation, the determining, where the determining, by the authentication module, is configured to determine that the optical network unit represented by the serial number is configured but not activated, The optical network unit sends an authentication request message, and receives an authentication response message sent by the optical network unit, where the authentication response message includes an authentication identifier and/or an authentication password of the optical network unit; if the optical network unit is determined The sequence number and the authentication identifier and/or the authentication password of the optical network unit are legal, and then determining that the optical network unit represented by the serial number has been authenticated and allocating the optical network unit to the optical network unit represented by the serial number Logo.

With reference to the fourth possible implementation manner of the third aspect, in a seventh possible implementation, the authentication module is specifically configured to: if it is determined that the serial number of the optical network unit is not configured and is not activated, The optical network unit allocates a temporary optical network unit identifier; sends an authentication request message to the optical network unit; and receives an authentication response message sent by the optical network unit, where the authentication response message includes an authentication identifier of the optical network unit And determining an authentication password; if it is determined that the serial number of the optical network unit and the authentication identifier and/or the authentication password of the optical network unit are legal, determining that the optical network unit has passed the authentication; sending the optical network unit to the optical network unit a line instruction, and releasing the temporary network identifier; resending the registration request message to the optical network unit; receiving the registration response message retransmitted by the optical network unit, and is an optical network represented by the serial number The unit assigns the optical network unit identity.

With reference to the seventh possible implementation manner of the third aspect, in the eighth possible implementation, the sending module is further configured to send a third ranging request message to the optical network unit;

The receiving module is further configured to receive a third ranging response message sent by the optical network unit to obtain a third ranging result.

With reference to any one of the possible implementations of the fourth to the eighth possible implementations of the third aspect, in the ninth possible implementation, the sending module is specifically configured to use the default spectrum range or all the downlinks. The spectrum range or management channel uses the default downlink bit bearer table to the optical network The meta sends a registration request message.

With reference to the ninth possible implementation manner of the third aspect, in the tenth possible implementation, the optical line terminal further includes:

And a spectrum allocation module, configured to send spectrum allocation information to the optical network unit, so that the optical network unit adjusts the spectrum working range to the target band by adjusting the electrically tunable filter according to the spectrum allocation information.

With reference to any one of the possible implementation manners of the fourth to the eighth possible implementation manners of the third aspect, in the eleventh possible implementation manner, the sending module is specifically used at all downlink wavelengths or default Sending a registration request message to the optical network unit using a default downlink bit bearer table on the initial wavelength or the common management wavelength;

The receiving module is configured to receive, by using the optical network unit, a default uplink bit on an uplink wavelength corresponding to a downlink wavelength that is sent by the optical network unit to receive a registration request message by adjusting the optical adjustable transmitter. And a registration response message sent by the bearer table, where the registration response message includes a sequence number of the optical network unit.

With reference to the eleventh possible implementation manner of the third aspect, in the twelfth possible implementation, the optical line terminal further includes:

a wavelength distribution module, configured to allocate an uplink wavelength and a downlink wavelength to the optical network unit; and send wavelength allocation information to the optical network unit, so that the optical network unit adjusts the optical network unit light according to the wavelength allocation information The wavelength of the transmitter and optical receiver.

A fourth aspect provides an optical network unit, including:

a receiving module, configured to receive a downlink training sequence sent by the optical line terminal;

a calculation module, configured to calculate a downlink bit bearer table of the optical network unit according to the downlink training sequence;

a sending module, configured to send, to the optical line terminal, a downlink bit bearer table and an uplink training sequence of the optical network unit, so that the optical line terminal calculates an uplink bit bearer of the optical network unit according to the uplink training sequence And calculating and updating a system downlink bit bearer table and a system uplink bit bearer table according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit;

And an update module, configured to receive and update the system downlink bit bearer table and the system uplink bit bearer table sent by the optical line terminal. In a first possible implementation manner of the fourth aspect, the calculating module is configured to calculate, according to the downlink training sequence, a signal to noise ratio of each downlink subcarrier that receives the downlink training sequence; Calculating a signal to noise ratio of each downlink subcarrier of the sequence calculates a downlink bit bearer table of the optical network unit.

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a second possible implementation manner, the receiving module is further configured to receive a second ranging request message sent by the optical line terminal;

The sending module is further configured to send a second ranging response message to the optical line terminal, so that the optical line terminal acquires a second ranging result.

With reference to any one of the possible implementation manners of the fourth aspect to the fourth possible implementation manner, in a third possible implementation, the receiving module is further configured to receive the default by using the optical line terminal. a registration request message sent by the downlink bit bearer table;

The sending module is further configured to send a registration response message by using a default uplink bit bearer table, where the registration response message includes a sequence number of the optical network unit;

The receiving module is further configured to receive an optical network unit identifier that is sent by the optical line terminal, where the optical network unit identifier is that the optical line terminal determines that the optical network unit represented by the serial number has been authenticated. The serial number represents the assigned by the optical network unit.

With reference to the third possible implementation manner of the fourth aspect, in a fourth possible implementation, the receiving module is configured to receive an optical network unit identifier that is sent by the optical line terminal, where the optical network unit identifier is The optical line terminal determines that the optical network unit represented by the serial number is configured and activated, and is allocated to the optical network unit represented by the serial number.

With reference to the third possible implementation manner of the fourth aspect, in a fifth possible implementation, the receiving module is configured to receive an authentication request message sent by the optical line terminal, where the authentication request message is The optical line terminal determines that the optical network unit represented by the serial number is configured but not activated, and is sent to;

The sending module is specifically configured to send an authentication response message to the optical line terminal, where the authentication response message includes an authentication identifier and/or an authentication password of the optical network unit;

The receiving module is further configured to receive an optical network unit identifier sent by the optical line terminal, where the optical network unit identifier determines, by the optical line terminal, a serial number of the optical network unit and an authentication of the optical network unit The optical network unit represented by the serial number after the identification and/or authentication password is legal distributed.

With reference to the third possible implementation manner of the fourth aspect, in a sixth possible implementation, the receiving module is configured to receive an authentication request message sent by the optical line terminal, where the authentication request message includes a temporary An optical network unit identifier, where the authentication request message is sent by the optical line terminal after determining that the serial number of the optical network unit is not configured and is not activated;

The receiving module is further configured to receive a downlink command sent by the optical line terminal, where the offline command is a sequence number of the optical network unit of the optical line terminal and an authentication identifier of the optical network unit Or sending the authentication password after being sent; receiving the registration request message resent by the optical line terminal;

The sending module is further configured to resend the registration response message to the optical line terminal; the receiving module is further configured to receive an optical network unit identifier sent by the optical line terminal. With reference to the sixth possible implementation manner of the fourth aspect, in a seventh possible implementation, the receiving module is further configured to receive a third ranging request message sent by the optical line terminal;

The sending module is further configured to send a third ranging response message to the optical line terminal, so that the optical line terminal acquires a third ranging result.

With reference to any one of the possible implementations of the third to seventh possible implementations of the fourth aspect, in an eighth possible implementation, the receiving module is specifically configured to receive the optical line terminal by default. The spectrum request range or all downlink spectrum ranges or management channels use the registration request message sent by the default downlink bit bearer table.

With reference to the eighth possible implementation of the fourth aspect, in the ninth possible implementation, the optical network unit further includes:

And a spectrum adjustment module, configured to receive spectrum allocation information sent by the optical line terminal; and adjust a spectrum working range to a target band by adjusting an electrically tunable filter according to the spectrum allocation information.

With reference to any one of the possible implementations of the third to seventh possible implementations of the fourth aspect, in a tenth possible implementation, the receiving module is specifically configured to receive the optical line terminal at all a registration request message sent by using a default downlink bit bearer table on the downlink wavelength or the default initial wavelength or the common management wavelength;

The sending module is specifically configured to adjust the optical adjustable transmitter after any upstream wavelength or Receiving, by the optical network unit, the registration response message sent by using the default uplink bit bearer table on the uplink wavelength corresponding to the downlink wavelength of the registration request message, where the registration response message includes the sequence number of the optical network unit.

With reference to the tenth possible implementation manner of the fourth aspect, in an eleventh possible implementation manner, the method further includes:

a wavelength distribution module, configured to receive wavelength allocation information sent by the optical line terminal, where the wavelength allocation information is allocated by the optical line terminal to the optical network unit; and the optical network unit is adjusted according to the wavelength allocation information The wavelength of the optical transmitter and optical receiver.

The fifth aspect provides an Orthogonal Frequency Division Multiplexing Passive Optical Network System, including:

An optical line termination provided by any of the possible implementations of the third aspect;

An optical network unit as provided by any of the possible implementations of the fourth aspect;

Optical distribution network.

The method, device and system for registering an Orthogonal Frequency Division Multiplexed Passive Optical Network are provided. The OLT sends a downlink training sequence to the authenticated ONU, and receives the downlink bit bearer table and uplink of the ONU sent by the ONU. The training sequence can be used to calculate the uplink bit bearer table of the ONU, and use the downlink bit bearer table and the uplink bit bearer table of the ONU to update the system downlink bit bearer table and the system uplink bit bearer table, and send the same to the ONU, so that the OLT and the ONU can be enabled. The updated system downlink bit bearer table and the system uplink bit bearer table are used to transmit data, thereby maximizing the link capacity of the OFDM-PON. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a schematic diagram of a typical single-wavelength OFDM-PON architecture;

2 is a schematic diagram of an OFDM-PON architecture based on Nyquist multiplexing technology;

FIG. 3 is a flowchart of Embodiment 1 of an OFDM-PON registration activation method according to an embodiment of the present disclosure;

FIG. 4 is a flowchart of Embodiment 2 of an OFDM-PON registration activation method according to an embodiment of the present invention Figure

FIG. 5 is a flowchart of Embodiment 3 of an OFDM-PON registration method according to an embodiment of the present invention;

6 is a flow chart of Embodiment 4 of an OFDM-PON registration method according to an embodiment of the present invention;

FIG. 7 is a flowchart of Embodiment 5 of an OFDM-PON registration method according to an embodiment of the present invention;

FIG. 8 is a flowchart of Embodiment 6 of an OFDM-PON registration method according to an embodiment of the present invention;

FIG. 9 is a flowchart of Embodiment 7 of an OFDM-PON registration method according to an embodiment of the present invention;

10 is a flow chart of Embodiment 8 of an OFDM-PON registration method according to an embodiment of the present invention;

FIG. 11 is a flowchart of Embodiment 9 of an OFDM-PON registration method according to an embodiment of the present invention;

FIG. 12 is a flowchart of Embodiment 10 of an OFDM-PON registration method according to an embodiment of the present invention;

FIG. 13 is a flowchart of a signaling procedure of an OFDM-PON registration method according to an embodiment of the present invention;

14 is a flowchart of a signaling process of Embodiment 12 of an OFDM-PON registration method according to an embodiment of the present invention;

15 is a flowchart of a signaling process of Embodiment 13 of an OFDM-PON registration method according to an embodiment of the present invention;

16 is a flowchart of a signaling process of Embodiment 14 of an OFDM-PON registration method according to an embodiment of the present invention;

17 is a flow chart of a signal sequence of Embodiment 15 of an OFDM-PON registration method according to an embodiment of the present invention;

18 is a flowchart of a signaling process of Embodiment 16 of an OFDM-PON registration method according to an embodiment of the present invention;

19 is a ninth embodiment of an OFDM-PON registration method according to an embodiment of the present invention. Flow chart

20 is a flowchart of an eighteenth embodiment of an OFDM-PON registration activation method according to an embodiment of the present invention;

FIG. 21 is a flowchart of a ninth embodiment of an OFDM-PON registration activation method according to an embodiment of the present invention;

FIG. 22 is a schematic structural diagram of Embodiment 1 of an optical line terminal according to an embodiment of the present invention; FIG. 23 is a schematic structural diagram of Embodiment 2 of an optical line terminal according to an embodiment of the present invention; FIG. 24 is an optical line terminal according to an embodiment of the present invention; FIG. 25 is a schematic structural diagram of Embodiment 4 of an optical line terminal according to an embodiment of the present invention; FIG. 26 is a schematic structural diagram of Embodiment 1 of an optical network unit according to an embodiment of the present invention; FIG. 28 is a schematic structural diagram of Embodiment 3 of an optical network unit according to an embodiment of the present invention; FIG. 29 is a schematic structural diagram of Embodiment 1 of an OFDM-PON system according to an embodiment of the present invention; Schematic. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In the PON system, the OLT provides a network side interface for the PON system, and connects one or more ODNo ONUs to provide a user side interface for the PON system, and is connected to the ODN. If the ONU directly provides user port functions, such as an Ethernet user port for personal computers (PCs), it is called ONT. The ONUs mentioned below in the present invention collectively refer to ONUs and ONTs. The ODN is a passive optical splitting device used to connect OLT devices and ONU devices for distributing or multiplexing data signals between the OLT and the ONU. In an OFDM-PON system, the OLT to the ONU is called the downlink direction; conversely, the ONU to the OLT is the uplink direction.

FIG. 1 is a schematic diagram of a typical single-wavelength OFDM-PON architecture. As shown in FIG. 1, in a single-wavelength OFDM-PON system, there are only one wavelength in each of the uplink and downlink directions. In the downstream direction, the Medium Access Control (MAC) layer 111 of the OLT 110 is used to implement ONU management, Dynamic Bandwidth Allocation (DBA), ONU registration activation, data transceiving, etc.; Physical Medium Dependent (PMD) layer 112 is used to modulate data into quadrature amplitude modulation according to parameters configured by the MAC layer 111 ( Quadrature Amplitude Modulation (QAM) format and converted by Inverse Fast Fourier Transformation (IFFT), digital signal is converted into electrical signal by Digital to Analog Converter (DAC) 113; optical transmitter (Optical Transmitter, Tx) 114 is used to convert an electrical signal into an optical signal; the optical signal is transmitted to the ONU 130 via an optical fiber and a passive device, such as an optical splitter 120 (an optical fiber and a passive component ODN); an optical receiver of the ONU 130 (Optical) Receiver, Rx) 131 converts the optical signal into an electrical signal, converts the analog electrical signal into a digital signal by analog to digital converter (ADC) 132, and implements synchronous, fast Fourier transform (Fast Fourier) by PMD layer 133. Transformation, FFT), equalization, and QAM demodulation, the recovered data is passed to the MAC layer 134 for processing. In the uplink direction, the MAC layer 134 of the ONU 130 is used for implementing ONU management, DBA, data transceiving, and the like, and transmitting data at a time specified by the DBA; functions of the PMD layer 133, DAC135, and Txl36 in the ONU 130 and corresponding modules in the downstream direction of the OLT 110; The functions of the Rxll6, ADC115, and PMD layer 112 in the OLT 110 are similar to those of the corresponding modules in the downstream ONU 130. The Wavelength Division Multiplexing (WDM) 117 in the OLT 110 and the WDM 137 in the ONU 130 are used to enable different optical signals to be transmitted in the same optical fiber. In addition, there are multiple ONU devices such as ONU140 and ONU150 in the system, and their specific structures and functions are the same as those of OUN130.

2 is a schematic diagram of an OFDM-PON architecture based on Nyquist multiplexing technology. As shown in FIG. 2, in an OFDM-PON system based on the Nyquist multiplexing technique, there are only one wavelength in the uplink and downlink directions. Unlike the single-wavelength OFDM-PON system, there are two DACs in the upstream and downstream directions based on the Nyquist multiplexing technique, which operate in baseband mode and mixed mode, respectively. The DAC outputs a Radio Frequency (RF) carrier in the second or third order Nyquist zone in mixed mode. In the downlink direction, the MAC layer 211 of the OLT 210 is used to implement functions such as ONU management, DBA, ONU registration activation, data transmission and reception, etc. The PMD layer 212 is configured to modulate data into a QAM format according to parameters configured by the MAC layer 211 and after being converted by IFFT. The digital signal is converted into an electrical signal by the DAC213 and DAC214; wherein the DAC213 operates in baseband mode to convert the data to the baseband carrier; the DAC214 operates in a mixed mode to convert the data to the carrier of the radio; that is, after conversion by the DAC213 and DAC214 Data in different spectral ranges or bands, converted data from DAC213 and DAC214 After being combined by the electrical multiplexer 215, the electrical signal is converted into an optical signal by the Tx216; the optical signal is transmitted to the ONU 230 via the optical fiber and a passive device, such as the optical splitter 220 (the optical fiber and the passive component constitutes the ODN); the Rx231 of the ONU 230 emits light. After the signal is converted into an electrical signal, an appropriate band is selected by a Tunable Filter (TF) 232, and then the analog electrical signal is converted into a digital signal by the ADC 233, and the synchronization, FFT, equalization, and QAM solution are implemented by the PMD layer 234. Adjust, the recovered data is handed over to the MAC layer 235 for processing. In the uplink direction, the MAC layer 235 of the ONU 230 is used for implementing ONU management, DBA, data transceiving, and the like, and transmitting data at a time specified by the DBA; the functions of the PMD layer 234, the DAC layer 236, and the Tx237 in the ONU 230 are as shown in FIG. The functions of the PMD layer 133, the DAC 135, and the Txl36 in the ONU 130 are similar. The functions of the Rx217, the ADC 218, and the PMD layer 212 in the OLT 210 are similar to those of the Rx11, ADC 115, and PMD layers 112 in the OLT 110 of FIG. The WDM 219 in the OLT 210 and the WDM 238 in the ONU 230 are used to enable different optical signals to be transmitted in the same optical fiber. In addition, there are multiple ONU devices such as ONU240 and ONU250 in the system, and their specific structures and functions are the same as those of OUN230.

In addition, the multi-wavelength OFDM-PON system based on WDM technology differs from the single-wavelength OFDM-PON system in that there are four different wavelengths of optical signals in the downlink and uplink directions. The ONU's optical transmitter is typically a tunable laser. The ONU's optical receiver typically includes a tunable filter, which means that the ONU's optical and optical receivers can select the appropriate operating wavelength.

For the above OFDM-PON systems, the OFDM signal transmits data through multiple subcarriers. The maximum number of bits that a single subcarrier can carry is called bitloading (or B value), and each subcarrier and its bit bearer The mapping table of values is called a bit table (or a B table). In the OFDM-PON, the transmission distance between the OLT and the different ONUs is different. The signal-to-noise ratio of the links between different ONUs and OLTs is also different. The bit bearer table of each ONU may also be different. The bit bearer value of each subcarrier in the table is the smallest one of the bit bearer values of the same subcarrier in the bit bearer table of each ONU, so as to ensure normal data transmission between the OLT and each ONU. The bit bearer tables in the uplink and downlink directions in the OLT are respectively referred to as a system uplink bit bearer table and a system downlink bit bearer table. Management and Maintenance The system uplink bit bearer table and system downlink bit bearer table in the OLT can improve the link capacity utilization of the OFDM-PON system.

FIG. 3 is a flowchart of Embodiment 1 of an OFDM-PON registration activation method according to an embodiment of the present invention. As shown in FIG. 3, the method in this embodiment includes: Step S301: The optical line terminal sends a downlink training sequence to the optical network unit that has passed the authentication. Specifically, the embodiment provides an OFDM-PON registration activation method. When an ONU in an OFDM-PON system needs to join the network, it needs to be registered on the OLT and authenticated by the OLT. After the OLT determines that there is a registered and authenticated ONU in the network, the downlink training sequence is sent to the ONU, and the downlink training sequence is sent by using the downlink subcarrier between the OLT and the ONU, and each downlink subcarrier carries the downlink training sequence. Different bits.

The OLT has not obtained the downlink bit bearer table of the ONU. Therefore, the OLT sends the downlink training sequence to the ONU to use the default downlink bit bearer table. The bit bearer value of each downlink subcarrier in the default downlink bit bearer table is generally small. All ONUs can receive the downlink training sequence.

Step S302: The optical line terminal receives the downlink bit bearing table and the uplink training sequence of the optical network unit sent by the optical network unit, where the downlink bit bearer table of the optical network unit is calculated by the optical network unit according to the downlink training sequence.

Specifically, after the OLT sends the downlink training sequence to the ONU, the ONU calculates the downlink bit bearer table of the ONU according to the downlink training sequence, and the downlink bit bearer table of the ONU reflects the best of all downlink subcarriers of the ONU and the OLT. Bit carries the value. The OLT receives the downlink bit bearer table sent by the ONU, and the OLT also receives the uplink training sequence sent by the ONU.

It should be noted that the downlink training sequence sent by the OLT to the ONU and the uplink training sequence sent by the OLT to the ONU are preset in the OLT and the ONU, and the downlink training sequence and the uplink training sequence may be the same sequence or different. the sequence of.

Step S303: The optical line terminal calculates an uplink bit bearer table of the optical network unit according to the uplink training sequence.

Specifically, after the OLT receives the uplink training sequence sent by the ONU, the uplink training sequence is sent by the ONU through the uplink subcarrier, and each uplink subcarrier carries different bits in the uplink training sequence, and the OLT can perform the uplink training according to the received uplink. The sequence can calculate the uplink bit bearer table of the ONU.

Step S304, the optical line terminal calculates and updates the system downlink bit bearer table and the system uplink bit bearer table according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit.

Specifically, since OFDM-PON is a point-to-multipoint system, an OLT may connect to multiple ONUs and transmit data, and transmit data to different ONUs through the same subcarrier. The specific bearer value may be different. In order to ensure that each ONU connected to the OLT can send and receive data normally, and in order to maximize the link transmission capacity between the OLT and the ONU, the system downlink bit bearer table and system uplink are saved and maintained in the OLT. Bit bearer table. The system downlink bit bearer table indicates the bit bearer value of all downlink subcarriers of the OLT when transmitting data, which is the minimum value of the bit bearer values of the same subcarriers in the ONU downlink bit bearer table of all ONUs, which can ensure that each ONU is guaranteed. Can receive data sent by the OLT. The system uplink bit bearer table indicates the bit bearer value of all uplink subcarriers of all ONUs when transmitting data, which is the minimum value of the bit bearer values of the same subcarriers in the ONU uplink bit bearer table of all ONUs, which can ensure that the OLT can receive Data sent to all ONUs. After receiving the downlink bit bearer table sent by the ONU and calculating the uplink bit bearer table, the OLT updates the system downlink bit bearer table and the system uplink bit bearer table according to the downlink bit bearer table and the uplink bit bearer table of the ONU, respectively. The purpose of the OLT to update the system downlink bit bearer table and the system uplink bit bearer table is to enable all ONUs connected to the OLT to use the system downlink bit bearer table and the system uplink bit bearer table to transmit data between the OLT and the OLT.

Step S305: The optical line terminal sends a system downlink bit bearer table and a system uplink bit bearer table to the optical network unit, so that the optical network unit updates the system downlink bit bearer table and the system uplink bit bearer table.

Specifically, after the OLT updates the system downlink bit bearer table and the system uplink bit bearer table, the updated system downlink bit bearer table and the system uplink bit bearer table are sent to the ONU, so that the ONU also saves and updates the system downlink bit bearer table. And the system uplink bit bearer table, so that the ONU can also use the downlink bit bearer table of the system and the information in the system uplink bit bearer table to transmit data between the OLT and the OLT. In this way, both the OLT and the ONU can use the updated system downlink bit bearer table and the system uplink bit bearer table to transmit data, because the updated system downlink bit bearer table and the system uplink bit bearer table represent the optimal bits of all subcarriers of the OLT. The bearer value, so the OLT and the ONU use the updated system downlink bit bearer table and the system uplink bit bearer table to transmit data to maximize the link capacity of the OFDM-PON.

In this embodiment, the OLT sends a downlink training sequence to the authenticated ONU, and receives the downlink bit bearer table and the uplink training sequence of the ONU sent by the ONU, so that the uplink bit bearer table of the ONU can be calculated, and the downlink of the ONU is used. The bit bearer table and the uplink bit bearer table update the system downlink bit bearer table and the system uplink bit bearer table and send the data to the ONU, so that the OLT and the ONU can use the updated system downlink bit bearer table and the system uplink bit bearer table to transmit data. The link capacity of the OFDM-PON is maximized.

It should be noted that in the OFDM-PON system, between the OLT and the ONU transmitting data normally,

The OLT needs to measure the distance between the ONU and the ONU. In this embodiment, the process of updating and maintaining the system downlink bit bearer table and the system uplink bit bearer table is added to the ranging process, so that the system does not need to update and maintain the system downlink bit bearer table and The system uplink bit bearer table allocates a new signaling flow, thereby saving system resources. When an ONU in an OFDM-PON system needs to join the network, it needs to be registered on the OLT and authenticated by the OLT. After the OLT determines that there is a registered and authenticated ONU in the network, the first ranging request message is sent to the ONU, and the downlink training sequence is also sent while the first ranging request message is sent. After the OLT sends the first ranging request message to the ONU, the ONU calculates the downlink bit bearer table of the ONU according to the downlink training sequence in the first ranging request message, and the downlink bit bearer table of the ONU reflects the ONU and the OLT. The optimal bit-bearing value for all downlink subcarriers. Then, the OLT receives the first ranging response message sent by the ONU, so that the OLT obtains the first ranging result, and also receives the downlink bit bearer table and the uplink training sequence of the ONU. Further, the OLT can complete the process of calculating and updating the system uplink bearer table and the system downlink bearer table.

In the process of ranging between the OLT and the OUN, the process of calculating and updating the system downlink bit bearer table and the system uplink bit bearer table is added to maximize the link capacity of the OFDM-PON, thereby further saving system resources.

Further, in the embodiment shown in FIG. 3, the optical line terminal calculates an uplink bit bearer table of the optical network unit according to the uplink training sequence, and the method includes: calculating, by the optical line terminal, the signal and noise of each uplink subcarrier that receives the uplink training sequence according to the uplink training sequence. The optical line terminal calculates an uplink bit bearer table of the optical network unit according to the signal to noise ratio of each uplink subcarrier that receives the uplink training sequence.

Specifically, the OLT calculates the uplink bit bearer table of the ONU that sends the uplink training sequence according to the uplink training sequence, and calculates the signal to noise ratio (SNR) of each uplink subcarrier that receives the uplink training sequence. The OLT can obtain the SNR of each uplink subcarrier when receiving the uplink training sequence sent by the ONU through the uplink subcarriers, and calculate the bit bearer value that each uplink subcarrier can bear according to the SNR of each uplink subcarrier, that is, each uplink The uplink bit bearer value of the subcarrier. The OLT aggregates the uplink bit bearer values of the uplink subcarriers into an uplink bit bearer table of the ONU.

Further, in the embodiment shown in FIG. 3, the optical line terminal is based on the downlink bit of the optical network unit. The uplink bit bearer table of the bearer table and the optical network unit calculates and updates the system downlink bit bearer table and the system uplink bit bearer table, and the method includes: the optical line terminal sets the downlink bit bearer table and the downlink bit bearer table of the optical network unit to be the same downlink subcarrier The smaller one of the bit bearer values is used as the bit bearer value of the downlink subcarrier to update the system downlink bit bearer table; the optical line terminal sets the system uplink bit bearer table to the same uplink subcarrier of the optical network unit as the uplink bit bearer table. The smaller one of the bit bearer values is used as the bit bearer value of the uplink subcarrier to update the system uplink bit bearer table; or the optical line terminal shares the uplink bit bearer table of the optical network unit with the uplink bit bearer table of other optical network units. As the system uplink bit bearer table. The calculation and update method of the system uplink bearer bit table is divided into two types. In the first method, the optical line terminal sets the uplink bit bearer table of the system and the uplink bit bearer table of the optical network unit to be the same as the bit bearer value of the uplink subcarrier. One of the bit bearer values of the uplink subcarrier, the updated system uplink bearer table can be used by all optical network units in the system to send uplink data; in the second method, the optical line terminal uplinks the optical network unit The bit bearer table is used together with the uplink bit bearer table of other optical network units as the system uplink bit bearer table, and then each optical network unit uses the respective uplink bit bearer table to transmit uplink data, and the optical line terminal switches different lights according to the BWMAP information. The uplink bit bearer table of the network unit receives uplink data sent by different optical network units. In the first method, the bandwidth utilization performance is compromised, but the complexity is low. In the second method, the bandwidth utilization performance is the highest, but the complexity is high.

FIG. 4 is a flowchart of Embodiment 2 of an OFDM-PON registration activation method according to an embodiment of the present invention. As shown in FIG. 4, the method in this embodiment includes:

Step S401: The optical line terminal sends the first ranging request message and the downlink training sequence to the authenticated optical network unit.

Step S402: The optical line terminal receives the first ranging response message sent by the optical network unit, and the downlink bit bearer table and the uplink training sequence of the optical network unit, to obtain a first ranging result.

Step S403: The optical line terminal calculates an uplink bit bearer table of the optical network unit according to the uplink training sequence.

Step S404: The optical line terminal calculates and updates the system downlink bit bearer table and the system uplink bit bearer table according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit.

Step S405: The optical line terminal sends a system downlink bit bearer table and a system uplink bit bearer table to the optical network unit, so that the optical network unit updates the system downlink bit bearer table and the system uplink bit bearer. Loading the table.

Step S406: The optical line terminal sends a second ranging request message to the optical network unit.

Specifically, when the OLT sends the first ranging request message to the ONU in step S501, the OLT has not acquired the downlink bit bearer table of the ONU, and the ONU does not obtain the uplink of the ONU when the OLT receives the first ranging response message. Bit bearer table. Therefore, when the OLT obtains the first ranging result, the OLT and the ONU do not know the bit bearer values of the uplink and downlink subcarriers, so the first ranging result is not necessarily accurate. Therefore, after both the OLT and the ONU update the system downlink bit bearer table and the system uplink bit bearer table, the OLT sends a second ranging request message to the ONU to perform a second ranging procedure.

Step S407: The optical line terminal receives the second ranging response message sent by the optical network unit, to obtain a second ranging result.

Specifically, the OLT receives the second ranging response message sent by the ONU, thereby obtaining a second ranging result. The second ranging result obtained by the OLT is obtained after updating the system downlink bit bearer table and the system uplink bit bearer table, so the second ranging result is more accurate than the first ranging result, and the OLT uses the second ranging result and The performance of the ONU to transfer data is better.

In this embodiment, in the process of ranging between the OLT and the OUN, the process of calculating and updating the system downlink bit bearer table and the system uplink bit bearer table is added, and after updating the system downlink bit bearer table and the system uplink bit bearer table, The second ranging process is performed to maximize the link capacity of the OFDM-PON, thereby further saving system resources and improving system performance.

FIG. 5 is a flowchart of Embodiment 3 of an OFDM-PON registration activation method according to an embodiment of the present invention. This embodiment is a process for an ONU to register in an OLT. As shown in FIG. 5, the method in this embodiment includes:

Step S501: The optical line terminal sends a registration request message to the optical network unit by using a default downlink bit bearer table.

Specifically, when the OLT determines that there is an ONU that needs to be registered in the network, it sends a registration request message to the ONU. Since the ONU is not registered, the OLT does not know the bit bearer table of the ONU, and cannot guarantee the bit bearer table of the OLT and the ONU through the OLT. Communication. Therefore, the OLT sends a registration request message to the ONU using the default downlink bit bearer table. The default downlink bit bearer table and the default uplink bit bearer table use lower bit bearer values on each subcarrier to ensure that all ONUs can communicate normally with the OLT in a standard specified network. Step S502: The optical line terminal receives a registration response message sent by the optical network unit by using a default uplink bit bearer table, where the registration response message includes a sequence number of the optical network unit.

Specifically, the unregistered ONU also has no updated downlink bit bearer table and uplink bit bearer table. Therefore, the OLT receives the registration response message sent by the ONU using the default uplink bit bearer table. Each ONU has a unique serial number (SN) for the OLT to distinguish the ONUs. The registration response message received by the OLT includes the serial number of the ONU.

Step S503: The optical line terminal determines that the optical network unit represented by the serial number has passed the authentication and allocates an optical network unit identifier to the optical network unit represented by the serial number.

Specifically, after receiving the sequence number sent by the ONU, the OLT determines, according to the sequence number, whether the ONU represented by the sequence number is configured in the OLT. If the OLT determines that the ONU represented by the serial number is configured, the optical network unit identifier (ONU-ID) is allocated to the ONU represented by the serial number. The ONU-ID is the network identifier assigned by the OLT to the ONU.

The first authentication method: After the OLT receives the serial number sent by the ONU, after determining that the serial number of the ONU is configured in the OLT, it is also necessary to determine whether the ONU has been activated. If the OLT determines that the ONU is configured and activated, the OLT determines that the ONU represented by the sequence number has passed the authentication and assigns an ONU-ID to the ONU, otherwise the ONU-ID is not assigned.

The second authentication method: First, the OTL sends an authentication request message to the ONU; then the OLT receives an authentication response message sent by the ONU, where the authentication response message includes an authentication identifier (RegistrationJD) and/or an authentication password (password) of the ONU; If the serial number of the ONU and the authentication identifier and/or the authentication password of the ONU are legal, the OLT determines that the ONU represented by the serial number has passed the authentication and assigns an optical network unit identifier to the ONU represented by the serial number. If the OLT determines that the serial number of the ONU and the authentication identifier and/or authentication password of the ONU are invalid, the ONU is rejected for authentication, and the registration process ends.

The third authentication method: After receiving the serial number sent by the ONU, the OLT first allocates a temporary ONU-ID to the ONU; then the OLT sends an authentication request message to the ONU; then the OLT receives the authentication response message sent by the ONU, and the authentication response message Including the authentication identifier and/or the authentication password of the ONU; if the OLT determines that the serial number of the ONU and the authentication identifier and/or the authentication password of the ONU are legal, the OLT determines that the ONU has passed the authentication; then the OLT sends a downlink command to the ONU, and Release the temporary ONU-ID; then the OLT resends the registration request message to the ONU; finally, the OLT receives the registration response message resent by the ONU, and the re-transmitted registration response message includes the ONU The serial number, and the official ONU-ID is assigned to the ONU represented by the serial number.

Step S504: The optical line terminal sends the optical network unit identifier to the optical network unit.

Specifically, the OLT needs to send the OUN-ID assigned to the ONU to the ONU.

This embodiment is a process in which the ONU is registered in the OLT. After the ONU is registered in the OLT and authenticated, the OLT can start calculating and updating the system downlink bit bearer table and the system uplink bit bearer table.

In the embodiment shown in FIG. 2 to FIG. 5, only the case of a single-wavelength OFDM-PON system is considered, and for the OFDM-PON system based on the Nyquist multiplexing technology and the multi-wavelength OFDM-PON system based on the WDM technology, There are differences in how to register activation.

FIG. 6 is a flowchart of Embodiment 4 of an OFDM-PON registration activation method according to an embodiment of the present invention. This embodiment is a registration activation method of an OFDM-PON system based on a Nyquist multiplexing technology. As shown in FIG. The methods include:

Step S601: The optical line terminal sends a registration request message to the optical network unit by using a default downlink bit bearer table in a default spectrum range or all downlink spectrum ranges or management channels.

Step S602: The optical line terminal receives a registration response message sent by the optical network unit by using a default uplink bit bearer table, where the registration response message includes a sequence number of the optical network unit.

Step S603, the optical line terminal determines that the optical network unit represented by the serial number has passed the authentication and allocates the optical network unit identifier to the optical network unit represented by the serial number.

Step S604, the optical line terminal sends the optical network unit identifier to the optical network unit.

Step S605: The optical line terminal sends the first ranging request message and the downlink training sequence to the authenticated optical network unit.

Step S606: The optical line terminal sends the spectrum allocation information to the optical network unit, so that the optical network unit adjusts the spectrum working range to the target wave band by adjusting the electrically tunable filter according to the spectrum allocation information.

Step S607: The optical line terminal receives the first ranging response message sent by the optical network unit, the downlink bit bearer table of the optical network unit, and the uplink training sequence, to obtain a first ranging result.

Step S608, the optical line terminal calculates an uplink bit bearer table of the optical network unit according to the uplink training sequence.

Step S609, the optical line terminal calculates and updates the downlink bit bearer table and the uplink bit bearer table according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit. Step S610: The optical line terminal sends a downlink bit bearer table and an uplink bit bearer table to the optical network unit, so that the optical network unit updates the downlink bit bearer table and the uplink bit bearer table.

Step S611: The optical line terminal sends a second ranging request message to the optical network unit.

Step S612: The optical line terminal receives the second ranging response message sent by the optical network unit to obtain a second ranging result.

The specific method of this embodiment is similar to that of the single-wavelength OFDM-PON system embodiment, and details are not described herein again.

In addition, in the embodiment shown in FIG. 6, step S606 is performed after the OLT receives the sequence number sent by the ONU, and determines that the ONU represented by the sequence number is configured in the OLT. If the OLT receives the sequence number sent by the ONU, and determines that the ONU represented by the sequence number is not configured in the OLT and is not activated, there is no step S606, but is similar to step S503 in the embodiment shown in FIG. 5, in the optical line. Before the terminal resends the registration request message to the optical network unit, the method further includes: the optical line terminal transmitting the spectrum allocation information to the optical network unit, so that the optical network unit adjusts the spectrum working range by adjusting the electrically tunable filter according to the spectrum allocation information. Go to the target band.

FIG. 7 is a flowchart of Embodiment 5 of an OFDM-PON registration activation method according to an embodiment of the present invention. This embodiment is a registration activation method of a multi-wavelength OFDM-PON system based on WDM technology. As shown in FIG. The methods include:

Step S701: The optical line terminal sends a registration request message to the optical network unit by using a default downlink bit bearer table on all downlink wavelengths or default initial wavelengths or common management wavelengths.

Step S702, the optical line terminal receives the registration response sent by the optical network unit by using the default uplink bit bearer table on the uplink wavelength corresponding to the downlink wavelength of the receiving optical network unit and the downlink wavelength of the receiving optical network unit by adjusting the optical adjustable transmitter. The message, the registration response message includes the serial number of the optical network unit.

Specifically, when the uplink and downlink wavelengths of the OFDM-PON system are not bound, the optical line terminal receives the registration response message sent by the optical network unit by using the default uplink bit bearer table on any upstream wavelength after adjusting the optical adjustable transmitter; When the uplink and downlink wavelengths of the OFDM-PON system are bound, the optical line terminal receiving optical network unit uses the default uplink bit bearer on the uplink wavelength corresponding to the downlink wavelength corresponding to the sending optical network unit to send the registration request message by adjusting the optical adjustable transmitter. The registration response message sent by the table.

Step S703, the optical line terminal determines that the optical network unit represented by the serial number has passed the authentication and is The optical network unit represented by the serial number allocates an optical network unit identifier.

Step S704, the optical line terminal sends the optical network unit identifier to the optical network unit.

Step S705: The optical line terminal sends the first ranging request message and the downlink training sequence to the authenticated optical network unit.

Step S706: The optical line terminal allocates an uplink wavelength and a downlink wavelength to the optical network unit.

Step S707: The optical line terminal sends the wavelength allocation information to the optical network unit, so that the optical network unit adjusts the wavelengths of the optical network unit optical transmitter and the optical receiver according to the wavelength allocation information.

Step S708: The optical line terminal receives the first ranging response message, the downlink bit bearer table, and the uplink training sequence sent by the optical network unit, to obtain a first ranging result.

Step S709, the optical line terminal calculates an uplink bit bearer table of the optical network unit according to the uplink training sequence.

Step S710: The optical line terminal calculates and updates the downlink bit bearer table and the uplink bit bearer table according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit.

Step S711: The optical line terminal sends a downlink bit bearer table and an uplink bit bearer table to the optical network unit, so that the optical network unit updates the downlink bit bearer table and the uplink bit bearer table.

Step S712, the optical line terminal sends a second ranging request message to the optical network unit.

Step S713: The optical line terminal receives the second ranging response message sent by the optical network unit, to obtain a second ranging result.

In addition, in the embodiment shown in FIG. 7, step S706 and step S707 are performed after the OLT receives the sequence number sent by the ONU, and determines that the ONU represented by the sequence number is configured in the OLT. If the OLT receives the sequence number sent by the ONU, and determines that the ONU represented by the sequence number is not configured in the OLT and is not activated, there is no step S706 and step S707, but is similar to step S503 in the embodiment shown in FIG. Before the OLT resends the registration request message to the ONU, the method further includes: the optical line terminal allocates an uplink wavelength and a downlink wavelength to the optical network unit; the optical line terminal sends the wavelength allocation information to the optical network unit, so that the optical network unit allocates according to the wavelength. Information adjusts the wavelength of the optical network unit optical transmitter and optical receiver.

FIG. 8 is a flowchart of Embodiment 6 of an OFDM-PON registration activation method according to an embodiment of the present invention. As shown in FIG. 8, the method in this embodiment includes: Step S801, the authenticated optical network unit receives the downlink training sequence sent by the optical line terminal.

Specifically, the present embodiment provides an OFDM-PON registration activation method. When an ONU in an OFDM-PON system needs to join a network, it needs to be registered on the OLT and authenticated by the OLT. After the OLT determines that there is a registered and authenticated ONU in the network, the ONU receives the downlink training sequence sent by the OLT, and the downlink training sequence is sent by the downlink subcarrier between the OLT and the ONU, and each downlink subcarrier carries the downlink training sequence. Different bits.

Since the ONU has not obtained the system downlink bit bearer table, the OLT can use the default downlink bit bearer table to send the downlink training sequence to the ONU. The bit bearer value of each downlink subcarrier in the default downlink bit bearer table is generally small, so that all The ONU is able to receive the downlink training sequence.

Step S802, the optical network unit calculates a downlink bit bearer table of the optical network unit according to the downlink training sequence.

Specifically, after the ONU receives the downlink training sequence sent by the OLT, because the downlink training sequence is sent by the OLT through the downlink subcarrier, the downlink training sequence sent by the OLT through different subcarriers may be different, and the ONU may be based on The received downlink training sequence can calculate a downlink bit bearer table of the ONU.

Step S803, the optical network unit sends the downlink bit bearer table and the uplink training sequence of the optical network unit to the optical line terminal, so that the optical line terminal calculates the uplink bit bearer table of the optical network unit according to the uplink training sequence and the downlink bit according to the optical network unit. The uplink bit bearer table of the bearer table and the optical network unit calculates and updates the system downlink bit bearer table and the system uplink bit bearer table.

Specifically, the ONU sends the calculated downlink bit bearer table and the uplink training sequence to the OLT. Since the OFDM-PON is a point-to-multipoint system, one OLT may connect with multiple ONUs and transmit data, but pass the same sub- The bit-bearing value of the data transmitted by the carrier to different ONUs may be different. To ensure that each ONU connected to the OLT can send and receive data normally, and to maximize the transmission capacity between the OLT and the ONU, save and maintain it in the OLT. System downlink bit bearer table and system uplink bit bearer table. The system downlink bearer table indicates the bit bearer value of all downlink subcarriers of the OLT when transmitting data, which is the minimum value of the bit bearer values of the same subcarriers in the ONU downlink bit bearer table of all ONUs, and can ensure that each ONU is guaranteed. Ability to receive data sent by the OLT. The system uplink bit bearer table indicates the number of transmissions of all uplink subcarriers of all ONUs. The bit bearer value of the time base is the minimum value of the bit bearer values of the same subcarrier in the ONU uplink bit bearer table of all ONUs, and can ensure that the OLT can receive data sent by all ONUs. After receiving the downlink bit bearer table sent by the ONU and calculating the uplink bit bearer table, the OLT updates the system downlink bit bearer table and the system uplink bit bearer table according to the downlink bit bearer table and the uplink bit bearer table of the ONU, respectively. The purpose of the OLT to update the system downlink bit bearer table and the system uplink bit bearer table is to enable all ONUs connected to the OLT to use the system downlink bit bearer table and the system uplink bit bearer table to transmit data between the OLT and the OLT.

Step S804, the optical network unit receives and updates the system downlink bit bearer table and the system uplink bit bearer table sent by the optical line terminal.

Specifically, after the OLT updates the system downlink bit bearer table and the system uplink bit bearer table,

The ONU receives the updated system downlink bit bearer table and the system uplink bit bearer table sent by the OLT to the ONU, so that the ONU also saves and updates the system downlink bit bearer table and the system uplink bit bearer table, so that the ONU can also use the system downlink bit. The data in the bearer table and the system uplink bit bearer table is transmitted between the OLT and the OLT. In this way, both the OLT and the ONU can use the updated system downlink bit bearer table and the system uplink bit bearer table to transmit data, because the updated system downlink bit bearer table and the system uplink bit bearer table represent the optimal bits of all subcarriers of the OLT. The bearer value, so the OLT and the ONU use the updated system downlink bit bearer table and the system uplink bit bearer table to transmit data to maximize the link capacity of the OFDM-PON.

In this embodiment, the OLT sends a downlink training sequence to the authenticated ONU, and receives the downlink bit bearer table and the uplink training sequence of the ONU sent by the ONU, so that the uplink bit bearer table of the ONU can be calculated, and the downlink of the ONU is used. The bit bearer table and the uplink bit bearer table update the system downlink bit bearer table and the system uplink bit bearer table and send the data to the ONU, so that the OLT and the ONU can use the updated system downlink bit bearer table and the system uplink bit bearer table to transmit data, thereby The link capacity of OFDM-PON is maximized.

The OLT needs to measure the distance between the ONU and the ONU. In this embodiment, the process of updating and maintaining the system downlink bit bearer table and the system uplink bit bearer table is added to the ranging process, so that the system does not need to update and maintain the system downlink bit bearer table and The system uplink bit bearer table allocates a new signaling flow, thereby saving system resources. When an ONU in an OFDM-PON system needs to join the network, it needs to be registered on the OLT and authenticated by the OLT. When the OLT determines that the network is registered and passed After the authenticated ONU, the ONU receives the first ranging request message sent by the OLT, and the 0NU receives the downlink ranging sequence while receiving the first ranging request message. After receiving the first ranging request message sent by the OLT, the 0NU calculates the downlink bit bearer table of the ONU according to the downlink training sequence in the first ranging request message, and the downlink bit bearer table of the ONU reflects the ONU and the The bit-bearing value of all downlink subcarriers of 0LT. Then, the ONU sends a first ranging response message to the OLT, so that the 0LT obtains the first ranging result, and the ONU also sends the 0NU downlink bit bearer table and the uplink training sequence to the 0LT. Further, the 0LT can complete the process of calculating and updating the system uplink bearer table and the system downlink bearer table.

Further, in the embodiment shown in FIG. 8, the optical network unit calculates the downlink bit bearer table of the optical network unit according to the downlink training sequence, and the method includes: the optical network unit calculates, according to the downlink training sequence, the signal and noise of each downlink subcarrier that receives the downlink training sequence. The optical network unit calculates a downlink bit bearer table of the optical network unit according to a signal to noise ratio of each downlink subcarrier that receives the downlink training sequence.

Specifically, the ONU calculates the downlink bit bearer table of the ONU according to the downlink training sequence, and can calculate according to the SNR of each downlink subcarrier that receives the downlink training sequence. The ONU can obtain the SNR of each downlink subcarrier when receiving the downlink training sequence sent by the OLT through the downlink subcarriers, and calculate the bit bearer value that each downlink subcarrier can bear according to the SNR of each downlink subcarrier, that is, each downlink The downlink bit-bearing value of the subcarrier. The ONU aggregates the downlink bit bearer values of the downlink subcarriers together to be the downlink bit bearer table of the ONU.

FIG. 9 is a flowchart of Embodiment 7 of an OFDM-PON registration activation method according to an embodiment of the present invention. As shown in FIG. 9, the method in this embodiment includes:

Step S901: The authenticated optical network unit receives the first ranging request information and the downlink training sequence sent by the optical line terminal.

Step S902: The optical network unit sends the first ranging response message and the downlink bit bearer table and the uplink training sequence of the optical network unit to the optical line terminal, so that the optical line terminal obtains the first ranging result.

Step S903: The optical network unit sends the downlink bit bearer table and the uplink training sequence of the optical network unit to the optical line terminal, so that the optical line terminal calculates the uplink bit bearer table of the optical network unit according to the uplink training sequence, and the downlink bit according to the optical network unit. Upstream bits of bearer and optical network elements The bearer table calculates and updates the system downlink bit bearer table and the system uplink bit bearer table.

Step S904, the optical network unit receives and updates the system downlink bit bearer table and the system uplink bit bearer table sent by the optical line terminal.

Step S905: The optical network unit receives the second ranging request message sent by the optical line terminal.

Specifically, the OLT has not acquired the downlink bit bearer table of the ONU when the first ranging request message sent by the OLT is received by the OLT in the step S1101, and the ONU does not acquire the downlink ranging bearer message when the ONU sends the first ranging response message to the OLT. Upstream bit bearer table of the ONU. Therefore, when the OLT obtains the first ranging result, the OLT and the ONU do not know the bit-bearing values of the uplink and downlink subcarriers, so the first ranging result is not necessarily accurate. Therefore, after both the OLT and the ONU update the system downlink bit bearer table and the system uplink bit bearer table, the ONU receives the second ranging request message sent by the OLT, and performs a second ranging procedure.

Step S906, the optical network unit sends a second ranging response message to the optical line terminal, so that the optical line terminal acquires the second ranging result.

Specifically, the ONU sends a second ranging response message to the OLT, so that the OLT obtains the second ranging result. The second ranging result obtained by the OLT is obtained after updating the system downlink bit bearer table and the system uplink bit bearer table, so the second ranging result is more accurate than the first ranging result, and the OLT uses the second ranging result and The performance of the ONU to transfer data is better.

FIG. 10 is a flowchart of Embodiment 8 of an OFDM-PON registration activation method according to an embodiment of the present invention. This embodiment is a process in which an ONU is registered in an OLT. As shown in FIG. 10, the method in this embodiment includes:

Step S1001: The optical network unit receives a registration request message sent by the optical line terminal by using a default downlink bit bearer table.

Specifically, when the OLT determines that there is an ONU that needs to be registered in the network, the ONU receives the registration request message sent by the OLT. Since the ONU is not registered, the ONU bit bearer table is not known, and the OLT and the ONU cannot pass the OLT bit. Bearer table communication. Therefore, the ONU receives the registration request message sent by the OLT using the default downlink bit bearer table. Default downlink bit bearer table and The default upstream bit bearer table uses lower bit-bearing values on each subcarrier to guarantee all

The ONU is able to communicate normally with the OLT in a standard-defined network.

Step S1002: The optical network unit sends a registration response message by using a default uplink bit bearer table, where the registration response message includes a sequence number of the optical network unit.

Specifically, the unregistered ONU does not have the updated downlink bit bearer table and the uplink bit bearer table. Therefore, the ONU sends a registration response message to the OLT by using the default uplink bit bearer table, and the bit bearer value in the default uplink bit bearer table is compared. small. Each ONU has a unique serial number (SN), which is used to make the OLT distinguish each ONU. The registration response message sent by the ONU includes the serial number of the ONU.

Step S1003: The optical network unit receives the optical network unit identifier sent by the optical line terminal, where the optical network unit identifier is that the optical network unit determines that the optical network unit represented by the serial number has been authenticated and allocated for the optical network unit represented by the serial number. .

Specifically, after receiving the sequence number sent by the ONU, the OLT determines, according to the sequence number, whether the ONU represented by the sequence number is configured in the OLT. If the OLT determines that the ONU represented by the serial number is configured, the ONU-ID is assigned to the ONU represented by the serial number. The ONU-ID is the network identifier assigned by the OLT to the ONU. The ONU receives the OUN-ID sent by the OLT.

The second authentication method: If the OLT determines that the ONU represented by the serial number is configured but not activated, the OLT needs the ONU to perform authentication. First, the ONU receives the authentication request message sent by the OLT; then the ONU sends an authentication response message to the OLT, where the authentication response message includes the authentication identifier and/or the authentication password of the ONU; if the OLT determines the serial number of the ONU and the authentication identifier of the ONU and/or If the authentication password is valid, the OLT determines that the ONU represented by the serial number has passed the authentication and assigns an optical network unit identifier to the ONU represented by the serial number, and the ONU receives the ONU-ID sent by the OLT. If the OLT determines that the ONU's serial number and the ONU's authentication ID and/or authentication password are invalid, the ONU is rejected for authentication and the registration process ends.

The third authentication method: After the OLT receives the serial number sent by the ONU, and determines that the ONU represented by the serial number is not configured in the OLT and is not activated, the ONU receives the authentication sent by the OLT. The message requesting that the OLT includes the temporary ONU-ID for the ONU; the ONU sends an authentication response message to the OLT, where the authentication response message includes the authentication identifier and/or the authentication password of the ONU; if the OLT determines the sequence of the ONU If the authentication identifier and/or authentication password of the ONU and the ONU are legal, the OLT determines that the ONU has passed the authentication; then the ONU receives the offline command sent by the OLT; then the ONU receives the registration request message retransmitted by the OLT; the ONU resends the registration response to the OLT. The message, the re-sent registration response message includes the serial number of the ONU; finally, the ONU receives the official ONU-ID sent by the OLT.

In addition, after the OLT receives the sequence number sent by the ONU, it is determined that the ONU represented by the sequence number is not configured in the OLT and is not activated. Before the ONU receives the authentication request message sent by the OLT, the OLT further includes: The third ranging request message; the ONU sends a third ranging response message to the OLT, so that the OLT acquires the third ranging result.

In the embodiment shown in FIG. 8 to FIG. 10, only the case of a single-wavelength OFDM-PON system is considered, and for the OFDM-PON system based on the Nyquist multiplexing technology and the multi-wavelength OFDM-PON system based on the WDM technology, There are differences in how to register activation.

FIG. 11 is a flowchart of Embodiment 9 of an OFDM-PON registration activation method according to an embodiment of the present invention. This embodiment is a registration activation method of an OFDM-PON system based on a Nyquist multiplexing technology, as shown in FIG. The methods include:

Step S1101: The optical network unit receives a registration request message sent by the optical line terminal in a default spectrum range or all downlink spectrum ranges or a management channel using a default downlink bit bearer table.

Step S1102: The optical network unit uses a registration response message sent by using a default uplink bit bearer table, where the registration response message includes a sequence number of the optical network unit.

Step S1103: The optical network unit receives the optical network unit identifier sent by the optical line terminal, where the optical network unit identifier is that the optical network unit determines that the optical network unit represented by the serial number has been authenticated and allocated for the optical network unit represented by the serial number. .

Step S1104: The authenticated optical network unit receives the first ranging request information and the downlink training sequence sent by the optical line terminal.

Step S1105: The optical network unit receives spectrum allocation information sent by the optical line terminal. Step S1106: The optical network unit adjusts the spectrum working range to the target band by adjusting the electrically tunable filter according to the spectrum allocation information.

Step S1107: The optical network unit sends the first ranging response message and the downlink bit bearer table and the uplink training sequence of the optical network unit to the optical line terminal, so that the optical line terminal obtains the first ranging result.

Step S1108: The optical network unit sends a downlink bit bearer table and an uplink training sequence of the optical network unit to the optical line terminal, so that the optical line terminal calculates an uplink bit bearer table of the optical network unit according to the uplink training sequence, and downlink bits according to the optical network unit. The uplink bit bearer table of the bearer table and the optical network unit calculates and updates the system downlink bit bearer table and the system uplink bit bearer table.

Step S1109: The optical network unit receives and updates the system downlink bit bearing table and the system uplink bit bearer table sent by the optical line terminal.

Step S1110: The optical network unit receives the second ranging request message sent by the optical line terminal. Step S1111: The optical network unit sends a second ranging response message to the optical line terminal, so that the optical line terminal acquires the second ranging result.

In addition, in the embodiment shown in FIG. 11, step S1105 and step S1106 are performed after the OLT receives the sequence number sent by the ONU, and determines that the ONU represented by the sequence number is configured in the OLT. If the OLT receives the sequence number sent by the ONU, and determines that the ONU represented by the sequence number is not configured in the OLT and is not activated, there is no step S1105 and step S1106, but is similar to step S1003 in the embodiment shown in FIG. Before the optical network unit receives the registration request message retransmitted by the optical line terminal, the method further includes: the optical network unit receiving the spectrum allocation information sent by the optical line terminal; and the optical network unit adjusting the spectrum working range by adjusting the electrically tunable filter according to the spectrum allocation information Adjust to the target band.

12 is a flowchart of a tenth embodiment of an OFDM-PON registration activation method according to an embodiment of the present invention. This embodiment is a registration activation method of a multi-wavelength OFDM-PON system based on WDM technology. As shown in FIG. 12, the embodiment of the present invention is as shown in FIG. Methods include:

Step S1201: The optical network unit receives a registration request message sent by the optical line terminal using the default downlink bit bearer table at all downlink wavelengths or default initial wavelengths or common management wavelengths.

Step S1202: The optical network unit uses the default on the uplink wavelength corresponding to the downlink wavelength of the registration request message sent by the optical network unit after adjusting the optical adjustable transmitter. The registration response message sent by the row bit bearer table, where the registration response message includes the sequence number of the optical network unit.

Specifically, when the uplink and downlink wavelengths of the OFDM-PON system are not bound, the optical network unit adjusts the registration response message sent by using the default uplink bit bearer table on any upstream wavelength after adjusting the optical tunable transmitter; when the OFDM-PON system When the uplink and downlink wavelengths are bound, the optical network unit uses the registration response message sent by using the default uplink bit bearer table on the uplink wavelength corresponding to the downlink wavelength of the registration request message sent by the optical network unit after adjusting the optical adjustable transmitter.

Step S1203: The optical network unit receives the optical network unit identifier sent by the optical line terminal, where the optical network unit identifier is that the optical network unit determines that the optical network unit represented by the serial number has been authenticated and allocated for the optical network unit represented by the serial number. .

Step S1204: The authenticated optical network unit receives the first ranging request information and the downlink training sequence sent by the optical line terminal.

Step S1205: The optical network unit receives the wavelength allocation information sent by the optical line terminal, where the wavelength allocation information is allocated by the optical line terminal for the optical network unit.

Step S1206: The optical network unit adjusts wavelengths of the optical network unit optical transmitter and the optical receiver according to the wavelength allocation information.

Step S1207: The optical network unit sends the first ranging response message and the downlink bit bearer table and the uplink training sequence of the optical network unit to the optical line terminal, so that the optical line terminal obtains the first ranging result.

Step S1208: The optical network unit sends the downlink bit bearer table and the uplink training sequence of the optical network unit to the optical line terminal, so that the optical line terminal calculates the uplink bit bearer table of the optical network unit according to the uplink training sequence, and the downlink bit according to the optical network unit. The uplink bit bearer table of the bearer table and the optical network unit calculates and updates the system downlink bit bearer table and the system uplink bit bearer table.

Step S1209: The optical network unit receives and updates a system downlink bit bearing table and a system uplink bit bearer table sent by the optical line terminal.

Step S1210: The optical network unit receives the second ranging request message sent by the optical line terminal. Step S1211: The optical network unit sends a second ranging response message to the optical line terminal, so that the optical line terminal acquires the second ranging result.

In addition, in the embodiment shown in FIG. 12, step S1205 and step S1206 are that the OLT receives the ONU. After the serial number is sent, it is determined that the ONU represented by the serial number is configured after being configured in the OLT. If the OLT receives the sequence number sent by the ONU, and determines that the ONU represented by the sequence number is not configured in the OLT and is not activated, there is no step S1205 and step S1206, but is similar to step S1003 in the embodiment shown in FIG. Before the optical network unit receives the registration request message retransmitted by the optical line terminal, the method further includes: the optical network unit receiving the wavelength allocation information sent by the optical line terminal, where the wavelength allocation information is allocated by the optical line terminal for the optical network unit; The wavelengths of the optical network unit optical transmitter and the optical receiver are adjusted according to the wavelength allocation information.

FIG. 13 is a signaling flowchart of an OFDM-PON registration activation method according to an embodiment of the present invention. This embodiment is a registration activation method of a single-wavelength OFDM-PON system. In this embodiment, an ONU is configured in an OLT. And being activated, as shown in FIG. 13, the method in this embodiment includes: Step S1301: The OLT sends an ONU registration request in a default bit bearer table.

Step S1302: The ONU responds to the registration request with a default bit bearer table.

Step S1303: If the SN is configured and activated, the OLT allocates an ONU-ID to the ONU represented by the SN, that is, the authentication is completed by the SN.

Step S1304, the OLT initiates the first ranging, and is completed by the cooperation of the ONU.

Step S1305: The downlink PMD frame sent by the OLT includes a training sequence, and the ONU calculates the SNR of each subcarrier according to the received training sequence, and calculates a downlink bit bearer table of the ONU, and calculates the calculated downlink bit bearer table of the ONU. Send it to the OLT.

Step S1306, the training sequence is also included in the uplink PMD frame sent by the ONU, and the OLT calculates the SNR of each subcarrier according to the training sequence of the received ONU, and calculates an uplink bit bearer table of the ONU, and uses the default bit bearer table to set the uplink bit. The bearer table is sent to the ONU.

Step S1307: The OLT calculates a system downlink bearer table according to the received downlink bit bearer table of the ONU, and sends the system to the ONU.

Step S1308, the OLT and the ONU update the uplink bit bearer table of the system, the OLT restarts the ranging, and the ONU responds and completes the second ranging.

FIG. 14 is a signaling flowchart of Embodiment 12 of an OFDM-PON registration activation method according to an embodiment of the present invention. This embodiment is a registration activation method of a single-wavelength OFDM-PON system. In this embodiment, an ONU is configured in an OLT. However, the method is not activated. As shown in FIG. 14, the method in this embodiment includes: Step S1401: The OLT sends an ONU registration request in a default bit bearer table.

In step S1402, the ONU responds to the registration request with a default bit bearer table. Step S1403: The OLT sends an authentication request, and the authentication request may be completed in one frame with the ONU registration request or the ranging request.

Step S1404: The ONU responds to the authentication request, including an authentication password (Password) or an authentication identifier (RegisterlD).

Step S1405: If SN+ (Password or RegisterlD) is legal, the OLT allocates an ONU-ID to the ONU, that is, the authentication is completed.

Step S1406, the OLT initiates the first ranging, and is completed by the cooperation of the ONU.

Step S1407: The downlink PMD frame sent by the OLT includes a training sequence, and the ONU calculates the SNR of each subcarrier according to the received training sequence, and calculates a downlink bit bearer table of the ONU, and calculates the calculated downlink bit bearer table of the ONU. Send it to the OLT.

Step S1408, the training sequence is also included in the uplink PMD frame sent by the ONU, and the OLT calculates the SNR of each subcarrier according to the training sequence of the received ONU, and calculates an uplink bit bearer table of the ONU, and uses the default bit bearer table to set the uplink bit. The bearer table is sent to the ONU.

Step S1409: The OLT calculates a system downlink bearer table according to the received downlink bit bearer table of the ONU, and sends the system to the ONU.

Step S1410: The OLT and the ONU update the uplink bit bearer table of the system, and the OLT restarts the ranging, and the ONU responds and completes the second ranging.

FIG. 15 is a signaling flowchart of Embodiment 13 of an OFDM-PON registration activation method according to an embodiment of the present invention. This embodiment is a registration activation method for a single-wavelength OFDM-PON system. In this embodiment, an ONU is not configured in an OLT. As shown in FIG. 15, the method in this embodiment includes: Step S1501: The OLT sends an ONU registration request in a default bit bearer table.

Step S1502: The ONU responds to the registration request with a default bit bearer table.

Step S1503: For the ONU of the unknown SN, the OLT first allocates a temporary ONU-ID.

Step S1504, the OLT initiates the first ranging, and is completed by the cooperation of the ONU.

Step S1505: The OLT sends an authentication request, and the authentication request may be completed in one frame with the ONU registration request or the ranging request.

Step S1506: The ONU responds to the authentication request, including an authentication password (Password) or an authentication identifier (RegisterlD).

Step S1507: If SN+ (Password or RegisterlD) is legal, the OLT allocates an ONU-ID to the ONU, that is, the authentication is completed. In step S1508, the OLT issues an ONU offline command Deactivate_ONU-ID, and releases the temporary ONU-ID.

Step S1509: The OLT re-initiates the ONU registration request.

In step S1510, the ONU responds to the registration request.

Step S1511: The OLT allocates a corresponding ONU-ID to the known SN, that is, an official ONU-ID. In step S1512, the OLT initiates a second ranging, which is completed by the cooperation of the ONU.

Step S1513: The downlink PMD frame sent by the OLT includes a training sequence, and the ONU calculates the SNR of each subcarrier according to the received training sequence, and calculates a downlink bit bearer table of the ONU, and calculates the calculated downlink bit bearer table of the ONU. Send it to the OLT.

Step S1514: The training sequence is also included in the uplink PMD frame sent by the ONU. The OLT calculates the SNR of each subcarrier according to the training sequence of the received ONU, and calculates an uplink bit bearer table of the ONU, and uses the default bit bearer table to set the uplink bit. The bearer table is sent to the ONU.

Step S1515: The OLT calculates a system downlink bearer table according to the received downlink bit bearer table of the ONU, and sends the system to the ONU.

Step S1516: The OLT and the ONU update the uplink and downlink bit bearer tables of the system, and the OLT restarts the ranging, and the ONU responds and completes the third ranging.

In the embodiment shown in FIG. 13 to FIG. 15, for the downlink data, in the normal operation phase, there are two working modes, that is, the downlink subcarriers are operated in Time Division Multiplexing (TDM) mode, and g1 is used. The symbol only transmits the data of one ONU. When an ONU data is sent, its bit bearer table is sent as the bit bearer table of the symbol by the OLT. The header of each symbol contains the ONU-ID information, and the default bit carries the value. The sub-carriers in the downlink are operated in a frequency division multiplexing (FDM) mode, that is, different subcarriers are allocated to different ONUs, and the downlink bit bearer table is composed of bit bearer values of subcarriers corresponding to each ONU. The uplink data ONU works in the TDM mode in the optical domain, that is, one symbol transmits only one ONU data. In the normal operation phase, the OLT switches the bit bearer table used for receiving according to the bandwidth map (BWMAP), and the existing TDM. Similar to PON, such as Gigabit Passive Optical Network (GPON), Ethernet Passive Optical Network (EPON), 10G-EPON, 10G-GPON.

FIG. 16 is a signaling flowchart of Embodiment 14 of an OFDM-PON registration activation method according to an embodiment of the present invention. This embodiment is a registration activation of an OFDM-PON system based on a Nyquist multiplexing technology. In this embodiment, the ONU is configured and activated in the OLT. As shown in FIG. 16, the method in this embodiment includes:

Step S1601: The OLT sends an ONU registration request in a default bit bearer table in a default spectrum range or all downlink spectrum ranges or management channels.

Step S1602: The ONU adjusts the electrically tunable filter to have a spectrum range in a default spectrum range corresponding to the OLT, or all downlink spectrum ranges, or a management channel, and receives the downlink frame in a default bit bearer table, and sends the frame in a default bit bearer table. Its serial number SN, in response to the registration request.

Step S1603: If the SN is configured and activated, the OLT allocates an ONU-ID to the ONU represented by the SN, that is, the authentication is completed by the SN.

Step S1604, the OLT initiates the first ranging, and is completed by the cooperation of the ONU.

Step S1605: The OLT allocates a downlink spectrum working range of the ONU, that is, determines whether the ONU operates in a baseband mode or a mixed mode.

Step S1606: The ONU adjusts the spectrum working range of the downlink tunable filter to the target band according to the received information.

Step S1607: The OLT sends the training sequence in a default bit bearer table on the new downlink spectrum. Step S1608: The ONU calculates the SNR of each subcarrier according to the received training sequence, and calculates a downlink bit bearer table of the ONU, and sends the calculated downlink bit bearer table of the ONU to the OLT.

Step S1609: The training sequence is also included in the uplink PMD frame sent by the ONU. The OLT calculates the SNR of each subcarrier according to the training sequence of the received ONU, and calculates an uplink bit bearer table of the ONU, and uses the default bit bearer table to set the uplink bit. The bearer table is sent to the ONU.

Step S1610: The OLT calculates a system downlink bearer table according to the received downlink bit bearer table of the ONU, and sends the system to the ONU.

Step S1611: The OLT and the ONU update the uplink bit bearer table of the system, and the OLT restarts the ranging, and the ONU responds and completes the second ranging.

FIG. 17 is a signaling flowchart of Embodiment 15 of an OFDM-PON registration activation method according to an embodiment of the present invention. This embodiment is a registration activation method of an OFDM-PON system based on a Nyquist multiplexing technology. In this embodiment, an ONU is in The OLT is configured but not activated. As shown in FIG. 17, the method in this embodiment includes:

Step S1701: The OLT sends an ONU registration request in a default bit bearer table in a default spectrum range or all downlink spectrum ranges or management channels. Step S1702, the ONU adjusts the electrically tunable filter to have a spectrum range in a default spectrum range corresponding to the OLT, or all downlink spectrum ranges, or a management channel, and receives the downlink frame in a default bit bearer table, and sends the frame in a default bit bearer table. Its serial number SN, in response to the registration request.

Step S1703: The OLT sends an authentication request, and the authentication request may be completed in one frame with the ONU registration request or the ranging request.

Step S1704, the ONU responds to the authentication request, including an authentication password (Password) or an authentication identifier (RegisterlD).

Step S1705: If SN+ (Password or RegisterlD) is legal, the OLT allocates an ONU-ID to the ONU, that is, the authentication is completed.

Step S1706, the OLT initiates the first ranging, and is completed by the cooperation of the ONU.

Step S1707: The OLT allocates a downlink spectrum working range of the ONU, that is, determines whether the ONU operates in a baseband mode or a mixed mode.

Step S1708: The ONU adjusts the spectrum working range of the downlink tunable filter to the target band according to the received information.

Step S1709: The OLT sends the training sequence in a default bit bearer table on the new downlink spectrum. Step S1710: The ONU calculates the SNR of each subcarrier according to the received training sequence, and calculates a downlink bit bearer table of the ONU, and sends the calculated downlink bit bearer table of the ONU to the OLT.

Step S1711: The training sequence is also included in the uplink PMD frame sent by the ONU. The OLT calculates the SNR of each subcarrier according to the training sequence of the received ONU, and calculates an uplink bit bearer table of the ONU, and uses the default bit bearer table to set the uplink bit. The bearer table is sent to the ONU.

Step S1712: The OLT calculates a system downlink bearer table according to the received downlink bit bearer table of the ONU, and sends the system to the ONU.

Step S1713: The OLT and the ONU update the upper and lower bit bearer tables of the system, and the OLT restarts the ranging, and the ONU responds and completes the second ranging.

FIG. 18 is a signaling flowchart of Embodiment 16 of an OFDM-PON registration activation method according to an embodiment of the present invention. This embodiment is a registration activation method of an OFDM-PON system based on a Nyquist multiplexing technology. In this embodiment, an ONU is in The unconfigured in the OLT is not activated. As shown in FIG. 18, the method in this embodiment includes:

Step S1801, the OLT is in a default spectrum range or all downlink spectrum ranges or management channels, The ONU registration request is sent in the default bit bearer table.

Step S1802, the ONU adjusts the electrically tunable filter to have a spectrum range in a default spectrum range corresponding to the OLT, or all downlink spectrum ranges, or a management channel, and receives the downlink frame in a default bit bearer table, and sends the frame in a default bit bearer table. Its serial number SN, in response to the registration request.

Step S1803: For the ONU of the unknown SN, the OLT first allocates a temporary ONU-ID.

Step S1804, the OLT initiates the first ranging, and is completed by the cooperation of the ONU.

Step S1805: The OLT sends an authentication request, and the authentication request may be completed in one frame with the ONU registration request or the ranging request.

Step S1806: The ONU responds to the authentication request, including an authentication password (Password) or an authentication identifier (RegisterlD).

Step SI 807, if SN+ (Password or RegisterlD) is legal, the OLT assigns an ONU-ID to the ONU, that is, the authentication is completed.

Step S1808, the OLT allocates the downlink spectrum working range of the ONU, that is, determines whether the ONU operates in a baseband mode or a mixed mode.

Step S1809, the OLT issues an ONU offline instruction Deactivate_ONU-ID, and releases the temporary

ONU-ID

Step S1810: The ONU adjusts the spectrum working range of the downlink tunable filter to the target band according to the received information.

Registration request.

Step S1813: The OLT allocates a corresponding ONU-ID to the known SN, that is, an official ONU-ID. Step S1814, the OLT initiates a second ranging, which is completed by the cooperation of the ONU.

Step S1815: The downlink PMD frame sent by the OLT includes a training sequence, and the ONU calculates the SNR of each subcarrier according to the received training sequence, and calculates a downlink bit bearer table of the ONU, and calculates the calculated downlink bit bearer table of the ONU. Send it to the OLT.

Step S1816: The training sequence is also included in the uplink PMD frame sent by the ONU. The OLT calculates the SNR of each subcarrier according to the training sequence of the received ONU, and calculates an uplink bit bearer table of the ONU, and uses the default bit bearer table to set the uplink bit. The bearer table is sent to the ONU.

Step S1817: The OLT calculates a system downlink bit bearer table according to the received downlink bit bearer table of the ONU, and sends the bearer to the ONU. Step S1818, the OLT and the ONU update the uplink bit bearer table of the system, and the OLT restarts the ranging, and the ONU responds and completes the third ranging.

In the embodiment shown in Fig. 16 to Fig. 18, for downlink data, the downlink spectrum is divided into two bands, which are operated by frequency division or Nyquist multiplexing, and the ONU selects one of the bands by an electrically tunable filter. In the normal operation phase, there are two working modes on each band, which are respectively working in the TDM mode for the downlink subcarriers, that is, one symbol transmits only one ONU data, and when transmitting an ONU data, its bit bearer table is sent. As the OLT sends the bit bearer table of the symbol, the header of each symbol includes ONU-ID information, which is represented by a default bit bearer value; or the downlink subcarriers work in FDM mode, that is, different subcarriers are allocated to different ONUs. The downlink bit bearer table is composed of bit bearer values of the corresponding subcarriers of each ONU. The uplink data ONU works in the TDM mode in the optical domain, that is, one symbol transmits only one ONU data. In the normal operation phase, the OLT uses the bit bearer table for receiving and receiving according to the BWMAP, similar to the existing TDM-PON, such as GPON and EPON. , 10G-EPON, 10G-GPON.

FIG. 19 is a signaling flowchart of Embodiment 17 of an OFDM-PON registration activation method according to an embodiment of the present invention. This embodiment is a registration activation method of a multi-wavelength OFDM-PON system based on WDM technology. In this embodiment, an ONU is in The OLT is configured and activated. As shown in FIG. 19, the method in this embodiment includes:

Step S1901: The OLT sends an ONU registration request in a default bit bearer table on all downlink wavelengths or default initial wavelengths or common management wavelengths.

Step S1902, the ONU adjusts the optical tunable filter to any of the downlink wavelengths or the default initial wavelength or the common management wavelength, and receives the downlink frame by using the default bit bearer table, and the ONU adjusts the optical transmitter to the uplink wavelength corresponding to the downlink wavelength (up and down) The line wavelength binding scenario) or any wavelength (uplink and downlink wavelengths are unbound), and its serial number SN is sent in the default bit bearer table, in response to the registration request.

Step S1903: If the SN is configured and activated, the OLT allocates an ONU-ID to the ONU represented by the SN, that is, the authentication is completed by the SN.

Step S1904, the OLT initiates the first ranging, and is completed by the cooperation of the ONU.

Step S1905: The OLT allocates the upper and lower working wavelengths of the ONU, and sends the ONU to the ONU by using a default bit bearer table.

Step S1906, the ONU sets the operating wavelength of the optical transmitter and the receiver of the ONU according to the wavelength allocation information. Step S1907: The OLT sends the training sequence in a default bit bearer table on the new downlink wavelength. Step S1908, the ONU calculates the SNR of each subcarrier according to the received training sequence, calculates a downlink bit bearer table of the ONU, and then uses the default bit bearer table on the new uplink wavelength.

The downlink bit bearer table and training sequence of the ONU are sent to the OLT.

Step S1909: The OLT calculates the SNR of each subcarrier according to the training sequence of the received ONU, and calculates an uplink bit bearer table of the ONU, and sends the uplink bit bearer table to the ONU by using a default bit bearer table.

Step S1910: The OLT calculates a system downlink bearer table according to the received downlink bit bearer table of the ONU, and sends the system to the ONU.

Step S1911: The OLT and the ONU update the uplink bit bearer table of the system, and the OLT restarts the ranging, and the ONU responds and completes the second ranging.

FIG. 20 is a signaling flowchart of Embodiment 18 of an OFDM-PON registration activation method according to an embodiment of the present invention. This embodiment is a registration activation method of a multi-wavelength OFDM-PON system based on WDM technology. In this embodiment, an ONU is in The OLT is configured but not activated. As shown in FIG. 20, the method in this embodiment includes:

Step S2001: The OLT sends an ONU registration request in a default bit bearer table on all downlink wavelengths or default initial wavelengths or common management wavelengths.

Step S2002, the ONU adjusts the optical tunable filter to any of the downlink wavelengths or the default initial wavelength or the common management wavelength, and receives the downlink frame by using the default bit bearer table, and the ONU adjusts the optical transmitter to the uplink wavelength corresponding to the downlink wavelength (up and down) The line wavelength binding scenario) or any wavelength (uplink and downlink wavelengths are unbound), and its serial number SN is sent in the default bit bearer table, in response to the registration request.

Step S2003, the OLT sends an authentication request, and the authentication request may be completed in one frame with the ONU registration request or the ranging request.

Step S2004, the ONU responds to the authentication request, including an authentication password (Password) or an authentication identifier (RegisterlD).

In step S2005, if SN+ (Password or RegisterlD) is legal, the OLT allocates an ONU-ID to the ONU, that is, the authentication is completed.

Step S2006, the OLT initiates the first ranging, and is completed by the cooperation of the ONU.

In step S2007, the OLT allocates the upper and lower working wavelengths of the ONUs, and sends them to the ONUs in the default bit bearer table. In step S2008, the ONU sets the working wavelength of the optical transmitter and the receiver of the ONU according to the wavelength allocation information.

Step S2009, the OLT sends the training sequence in a default bit bearer table on the new downlink wavelength. Step S2010, the ONU calculates the SNR of each subcarrier according to the received training sequence, calculates a downlink bit bearer table of the ONU, and then uses the default bit bearer table on the new uplink wavelength.

Step S2011: The OLT calculates the SNR of each subcarrier according to the training sequence of the received ONU, and calculates an uplink bit bearer table of the ONU, and sends the uplink bit bearer table to the ONU by using a default bit bearer table.

Step S2012: The OLT calculates a system downlink bearer table according to the received downlink bit bearer table of the ONU, and sends the system to the ONU.

Step S2013, the OLT and the ONU update the upper and lower bit bearer tables of the system, and the OLT restarts the ranging, and the ONU responds and completes the second ranging.

FIG. 21 is a signaling flowchart of Embodiment 19 of an OFDM-PON registration activation method according to an embodiment of the present invention. This embodiment is a registration activation method of a multi-wavelength OFDM-PON system based on WDM technology. In this embodiment, an ONU is in The unconfigured in the OLT is not activated. As shown in FIG. 21, the method in this embodiment includes:

Step S2101: The OLT sends an ONU registration request in a default bit bearer table on all downlink wavelengths or default initial wavelengths or common management wavelengths.

Step S2102: The ONU adjusts the optical tunable filter to any of the downlink wavelengths or the default initial wavelength or the common management wavelength, and receives the downlink frame by using the default bit bearer table, and the ONU adjusts the optical transmitter to the uplink wavelength corresponding to the downlink wavelength (uplink and downlink) The wavelength-bound scenario) or any wavelength (uplink and downlink wavelengths are unbound), and its serial number SN is sent in the default bit bearer table, in response to the registration request.

Step S2103: For the ONU of the unknown SN, the OLT first allocates a temporary ONU-ID.

Step S2104: The OLT initiates the first ranging, and is completed by the cooperation of the ONU.

Step S2105: The OLT sends an authentication request, and the authentication request may be completed in one frame with the ONU registration request or the ranging request.

Step S2106: The ONU responds to the authentication request, including an authentication password (Password) or an authentication identifier (RegisterlD).

Step S2107, if SN+ (Password or RegisterlD) is legal, the OLT is the ONU. Assign the ONU-ID, that is, complete the authentication.

Step S2108: The OLT allocates the upper and lower working wavelengths of the ONU, and sends the ONU to the ONU by using a default bit bearer table.

Step S2109: The OLT sends an ONU offline command Deactivate_ONU-ID, and releases the temporary step S2110. The ONU sets the working wavelength of the ONU optical transmitter and the receiver according to the wavelength allocation information.

Step S2111: The OLT re-initiates the ONU registration request.

Step S2112, the ONU responds to the registration request.

Step S2113: The OLT allocates a corresponding ONU-ID to the known SN, that is, an official ONU-ID. Step S2114: The OLT initiates a second ranging, which is completed by the cooperation of the ONU.

Step S2115: The downlink PMD frame sent by the OLT includes a training sequence, and the ONU calculates the SNR of each subcarrier according to the received training sequence, and calculates a downlink bit bearer table of the ONU, and calculates the calculated downlink bit bearer table of the ONU. Send it to the OLT.

Step S2116: The training sequence is also included in the uplink PMD frame sent by the ONU, and the OLT calculates the SNR of each subcarrier according to the training sequence of the received ONU, and calculates an uplink bit bearer table of the ONU, and uses the default bit bearer table to set the uplink bit. The bearer table is sent to the ONU.

Step S2117: The OLT calculates a system downlink bearer table according to the received downlink bit bearer table of the ONU, and sends the system to the ONU.

Step S2118, the OLT and the ONU update the upper and lower bit bearer tables of the system, and the OLT restarts the ranging, and the ONU responds and completes the third ranging.

In the embodiment shown in FIG. 19 to FIG. 21, for downlink data, the downlink is divided into different channels according to the wavelength of the optical carrier, and the ONU selects one of the downlink wavelengths by using the optical tunable filter, and the wavelength of the adjustable transmitter can be adjusted by adjusting the wavelength of the adjustable transmitter. Choose one of the upstream wavelengths to work. In the normal operation phase, there are two working modes on each wavelength channel, that is, the downlink subcarriers work in TDM mode, that is, one symbol transmits only one ONU data, and when an ONU data is sent, its bit is carried. The table is used as the OLT to send the bit bearer table of the symbol, and the header of each symbol includes ONU-ID information, which is represented by a default bit bearer value; or the downlink subcarriers work in FDM mode, that is, different subcarriers are allocated to different ONUs. The downlink bit bearer table is composed of bit bearer values of the corresponding subcarriers of each ONU. The uplink data ONU works in TDM mode in the optical domain, that is, 1 symbol. Only one ONU data is transmitted. In the normal operation phase, the 0LT uses a bit bearer table for receiving and receiving according to the BWMAP, similar to the existing TDM-PON, such as GPON, EPON, 10G-EPON, and 10G-GPON.

FIG. 22 is a schematic structural diagram of Embodiment 1 of an optical line terminal according to an embodiment of the present invention. As shown in FIG. 22, the optical line terminal of this embodiment includes:

The sending module 221 is configured to send a downlink training sequence to the optical network unit that has passed the authentication. The receiving module 222 is configured to receive a downlink bit bearer table and an uplink training sequence of the optical network unit that are sent by the optical network unit, where a downlink bit bearer table of the optical network unit is configured by the optical network unit according to the downlink training The sequence is calculated.

The calculating module 223 is configured to calculate an uplink bit bearer table of the optical network unit according to the uplink training sequence.

The updating module 224 is configured to calculate and update the system downlink bit bearer table and the system uplink bit bearer table according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit.

The sending module 221 is further configured to send the system downlink bit bearer table and the system uplink bit bearer table to the optical network unit, so that the optical network unit updates the system downlink bit bearer table and the system uplink Bit bearer table.

The optical line terminal of this embodiment is used to implement the technical solution of the method embodiment shown in FIG. 3, and the principle and the technical effect are similar, and details are not described herein again.

Further, in the embodiment shown in FIG. 22, the calculating module 223 is specifically configured to calculate, according to the uplink training sequence, a signal to noise ratio of each uplink subcarrier that receives the uplink training sequence; and according to each of the uplink training sequences received The signal to noise ratio of the uplink subcarrier calculates an uplink bit bearer table of the optical network unit.

Further, in the embodiment shown in FIG. 22, the updating module 224 is specifically configured to use the same one of the bit bearer values of the downlink subcarriers of the downlink bit bearer table of the system and the downlink bit bearer table of the optical network unit. And as a bit bearer value of the downlink subcarrier, to update the system downlink bit bearer table; the system uplink bit bearer table is the same as the uplink bit bearer table of the optical network unit, and the bit bearer value of the uplink subcarrier is smaller One of the bit bearer values of the uplink subcarrier to update the system uplink bit bearer table; or the optical line terminal shares the uplink bit bearer table of the optical network unit with an uplink bit bearer table of other optical network units As the system Upstream bit bearer table.

Further, in the embodiment shown in FIG. 22, the sending module 221 is further configured to send a second ranging request message to the optical network unit, and the receiving module 222 is further configured to receive the second measurement sent by the optical network unit. From the response message, to obtain the second ranging result.

FIG. 23 is a schematic structural diagram of Embodiment 2 of an optical line terminal according to an embodiment of the present invention, as shown in FIG.

23, the optical line terminal of this embodiment is based on FIG. 22,

The sending module 221 is further configured to send a registration request message to the optical network unit by using a default downlink bit bearer table.

The receiving module 222 is further configured to receive a registration response message sent by the optical network unit by using a default uplink bit bearer table, where the registration response message includes a sequence number of the optical network unit; the optical line terminal further includes: an authentication module 225. Determine an optical network unit that is represented by the serial number has been authenticated and allocate an optical network unit identifier for the optical network unit represented by the serial number.

The sending module 221 is further configured to send the optical network unit identifier to the optical network unit. The optical line terminal of this embodiment is used to implement the technical solution of the method embodiment shown in FIG. 5. The principle and the technical effect are similar, and details are not described herein again.

Further, in the embodiment shown in FIG. 23, the authentication module 225 is specifically configured to: if it is determined that the optical network unit represented by the serial number is configured and activated, determine that the optical network unit represented by the serial number has been authenticated and Assigning the optical network unit identifier to the optical network unit represented by the serial number.

Further, in the embodiment shown in FIG. 23, the authentication module 225 is specifically configured to: if it is determined that the optical network unit represented by the serial number is configured but not activated, send an authentication request message to the optical network unit; Determining, by the optical network unit, an authentication response message, where the authentication response message includes an authentication identifier and/or an authentication password of the optical network unit; and determining a sequence number of the optical network unit and an authentication identifier of the optical network unit And/or the authentication password is legal, it is determined that the optical network unit represented by the serial number has been authenticated and the optical network unit identifier is allocated for the optical network unit represented by the serial number.

Further, in the embodiment shown in FIG. 23, the authentication module 225 is specifically configured to allocate a temporary optical network unit identifier to the optical network unit if it is determined that the serial number of the optical network unit is not configured and is not activated; The optical network unit sends an authentication request message, and receives an authentication response message sent by the optical network unit, where the authentication response message includes an authentication identifier and/or an authentication password of the optical network unit; if the optical network unit is determined Serial number and the authentication identifier of the optical network unit and / Or determining that the authentication password is legal, determining that the optical network unit has passed the authentication; sending a downlink command to the optical network unit, and releasing the temporary network identifier; resending the registration request message to the optical network unit; receiving And the optical network unit re-transmits the registration response message, and allocates the optical network unit identifier to the optical network unit represented by the serial number.

Further, in the embodiment shown in FIG. 23, the sending module 221 is further configured to send a third ranging request message to the optical network unit, and the receiving module 222 is further configured to receive the third measurement sent by the optical network unit. From the response message, to obtain the third ranging result.

Further, in the embodiment shown in FIG. 23, the sending module 221 is specifically configured to send a registration request message to the optical network unit by using a default downlink bit bearer table in a default spectrum range or all downlink spectrum ranges or management channels.

FIG. 24 is a schematic structural diagram of Embodiment 3 of an optical line terminal according to an embodiment of the present invention. As shown in FIG. 24, the optical line terminal of this embodiment further includes:

The spectrum allocation module 226 is configured to send spectrum allocation information to the optical network unit, so that the optical network unit adjusts the spectrum working range to the target band by adjusting the electrically tunable filter according to the spectrum allocation information.

The optical line terminal of this embodiment is used to perform the technical solution of the method embodiment shown in FIG. 6. The principle and the technical effect are similar, and details are not described herein again.

Further, in the embodiment shown in FIG. 23, the sending module 221 is specifically configured to send a registration request message to the optical network unit by using a default downlink bit bearer table on all downlink wavelengths or default initial wavelengths or common management wavelengths; The module 222 is specifically configured to receive, by using the default uplink bit bearer table, the uplink network wavelength corresponding to the downlink wavelength corresponding to the downlink wavelength of the optical network unit that receives the registration request message after adjusting the optical tunable transmitter. The registration response message is sent, and the registration response message includes a sequence number of the optical network unit.

FIG. 25 is a schematic structural diagram of Embodiment 4 of an optical line terminal according to an embodiment of the present invention. As shown in FIG. 25, the optical line terminal of this embodiment further includes:

The wavelength distribution module 227 is configured to allocate an uplink wavelength and a downlink wavelength to the optical network unit, and send the wavelength allocation information to the optical network unit, so that the optical network unit adjusts the optical network unit according to the wavelength allocation information. The wavelength of the optical transmitter and optical receiver.

The optical line terminal of this embodiment is used to implement the technical solution of the method embodiment shown in FIG. 7. The implementation principle and the technical effect are similar, and details are not described herein again. FIG. 26 is a schematic structural diagram of Embodiment 1 of an optical network unit according to an embodiment of the present invention. As shown in FIG. 26, the optical network unit of this embodiment includes:

The receiving module 261 is configured to receive a downlink training sequence sent by the optical line terminal.

The calculating module 262 is configured to calculate a downlink bit bearer table of the optical network unit according to the downlink training sequence.

The sending module 263 is configured to send, to the optical line terminal, a downlink bit bearer table and an uplink training sequence of the optical network unit, so that the optical line terminal calculates an uplink bit of the optical network unit according to the uplink training sequence. The bearer table and the system downlink bit bearer table and the system uplink bit bearer table are calculated and updated according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit.

The update module 264 is configured to receive and update the system downlink bearer table and the system uplink bit bearer table sent by the optical line terminal.

The optical network unit of this embodiment is used to implement the technical solution of the method embodiment shown in FIG. 8. The principle and technical effects are similar, and details are not described herein again.

Further, in the embodiment shown in FIG. 26, the calculating module 263 is specifically configured to calculate, according to the downlink training sequence, a signal to noise ratio of each downlink subcarrier that receives the downlink training sequence; according to each of receiving the downlink training sequence. The signal to noise ratio of the downlink subcarrier calculates a downlink bit bearer table of the optical network unit.

Further, in the embodiment shown in FIG. 26, the receiving module 261 is further configured to receive a second ranging request message sent by the optical line terminal, and the sending module 262 is further configured to send the second time to the optical line terminal. The ranging response message is such that the optical line terminal acquires the second ranging result.

Further, in the embodiment shown in FIG. 26, the receiving module 261 is further configured to receive a registration request message sent by the optical line terminal by using a default downlink bit bearer table, and the sending module 262 is further configured to send by using a default uplink bit bearer table. a registration response message, the registration response message includes a sequence number of the optical network unit, and a receiving module 261, configured to receive an optical network unit identifier sent by the optical line terminal, where the optical network unit identifier is the light The line terminal determines that the optical network unit represented by the serial number has been authenticated and allocated for the optical network unit represented by the serial number.

Further, in the embodiment shown in FIG. 26, the receiving module 261 is specifically configured to receive an optical network unit identifier sent by the optical line terminal, where the optical network unit identifier determines that the optical line terminal represents the serial number. The optical network unit is configured and activated to be the optical network represented by the serial number Unit assigned.

Further, in the embodiment shown in FIG. 26, the receiving module 261 is specifically configured to receive an authentication request message sent by the optical line terminal, where the authentication request message is used by the optical line terminal to determine an optical network represented by the serial number. The sending module 262 is configured to send an authentication response message to the optical line terminal, where the authentication response message includes an authentication identifier and/or an authentication password of the optical network unit. The receiving module 261 is further configured to receive an optical network unit identifier sent by the optical line terminal, where the optical network unit identifier determines, by the optical line terminal, a serial number of the optical network unit and an authentication of the optical network unit The identification and/or authentication password is legally assigned to the optical network unit represented by the serial number.

Further, in the embodiment shown in FIG. 26, the receiving module 261 is specifically configured to receive an authentication request message sent by the optical line terminal, where the authentication request message includes a temporary optical network unit identifier, where the authentication request message is The optical line terminal determines that the sequence number of the optical network unit is not configured and is not activated, and the sending module 262 is configured to send an authentication response message to the optical line terminal, where the authentication response message includes Determining an authentication identifier and/or an authentication password of the optical network unit; the receiving module 261 is further configured to receive a downlink command sent by the optical line terminal, where the offline command is a sequence of the optical network unit of the optical line terminal And transmitting, after the authentication identifier and/or the authentication password of the optical network unit is legal; receiving the registration request message retransmitted by the optical line terminal; and sending module 262, further configured to resend to the optical line terminal The registration response message; the receiving module 261 is further configured to receive the optical network unit identifier sent by the optical line terminal

Further, in the embodiment shown in FIG. 28, the receiving module 261 is further configured to receive a third ranging request message sent by the optical line terminal, and the sending module 262 is further configured to send the third measurement to the optical line terminal. From the response message, the optical line terminal acquires the third ranging result.

Further, in the embodiment shown in FIG. 26, the receiving module 261 is specifically configured to receive a registration request message sent by the ray path terminal in a default spectrum range or all downlink spectrum ranges or a management channel using a default downlink bit bearer table.

FIG. 27 is a schematic structural diagram of Embodiment 2 of an optical network unit according to an embodiment of the present invention. As shown in FIG. 27, the optical network unit of this embodiment further includes:

The spectrum adjustment module 265 is configured to receive spectrum allocation information sent by the optical line terminal, and adjust the spectrum working range to the target band by adjusting the electrically tunable filter according to the spectrum allocation information. The optical network unit of this embodiment is used to implement the technical solution of the method embodiment shown in FIG. 11, and the implementation principle and technical effects are similar, and details are not described herein again.

Further, in the embodiment shown in FIG. 26, the receiving module 261 is specifically configured to receive a registration request message sent by the optical line terminal by using a default downlink bit bearer table at all downlink wavelengths or default initial wavelengths or common management wavelengths; The sending module 262 is specifically configured to: use the default uplink bit bearer table to send the registration response message after adjusting the optical tunable transmitter at any upstream wavelength or the uplink wavelength corresponding to the downlink wavelength that receives the registration request message by the optical network unit. The registration response message includes a sequence number of the optical network unit.

FIG. 28 is a schematic structural diagram of Embodiment 3 of an optical network unit according to an embodiment of the present invention. As shown in FIG. 28, the optical network unit of this embodiment further includes:

a wavelength distribution module 266, configured to receive wavelength allocation information sent by the optical line terminal, where the wavelength allocation information is allocated by the optical line terminal to the optical network unit; and the optical network is adjusted according to the wavelength allocation information The wavelength of the unit optical transmitter and optical receiver.

The optical network unit of this embodiment is used to implement the technical solution of the method embodiment shown in FIG. 12, and the principle and the technical effect are similar, and details are not described herein again.

FIG. 29 is a schematic structural diagram of Embodiment 1 of an OFDM-PON system according to an embodiment of the present invention. As shown in FIG. 29, the OFDM-PON system of this embodiment includes:

Optical line terminal 291, at least one optical network unit 292 and optical distribution network 293. The optical path terminal 291 is an optical line terminal provided by any embodiment of the present invention, and the optical network unit 292 is an optical network unit provided by any embodiment of the present invention.

Finally, it should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting thereof; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

claims

1. An orthogonal frequency division multiplexing passive optical network registration activation method, which is characterized by including: the optical line terminal sends a downlink training sequence to the certified optical network unit;

The optical line terminal receives the downlink bit bearer table and the uplink training sequence of the optical network unit sent by the optical network unit. The downlink bit bearer table of the optical network unit is the downlink bit bearer table of the optical network unit according to the downlink training sequence. computational;

The optical line terminal calculates the uplink bit bearing table of the optical network unit according to the uplink training sequence;

2. The method according to claim 1, characterized in that the optical line terminal calculates the uplink bit bearer table of the optical network unit according to the uplink training sequence, including:

The optical line terminal calculates the signal-to-noise ratio of each uplink subcarrier receiving the uplink training sequence according to the uplink training sequence;

The optical line terminal calculates the uplink bit carrying table of the optical network unit based on the signal-to-noise ratio of each uplink subcarrier that receives the uplink training sequence.

3. The method according to claim 1 or 2, characterized in that, the optical line terminal calculates and updates the system downlink bits according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit. Bearer table and system uplink bit bearer table, including:

The optical line terminal uses the smaller one of the bit bearer values of the downlink subcarriers in the same downlink bit bearer table of the system downlink bit bearer table and the downlink bit bearer table of the optical network unit as the bit bearer value of the downlink subcarrier to update all The downlink bit carrying table of the above system;

The optical line terminal uses the smaller one of the bit bearing values of the uplink subcarrier in the system uplink bit bearing table and the uplink bit bearing table of the optical network unit as the bit bearing value of the uplink subcarrier to update all The system uplink bit bearer table; or the optical line terminal uses the uplink bit bearer table of the optical network unit and the uplink bit bearer table of other optical network units as all The above system uplink bit bearer table.

4. The method according to any one of claims 1 to 3, characterized in that the optical line terminal sends the system downlink bit bearer table and the system uplink bit bearer table to the optical network unit, so that After the optical network unit updates the system downlink bit bearer table and the system uplink bit bearer table, it also includes:

The optical line terminal sends a second ranging request message to the optical network unit;

5. The method according to any one of claims 1 to 4, characterized in that, before the optical line terminal sends the downlink training sequence to the certified optical network unit, it also includes:

The optical line terminal uses the default downlink bit bearer table to send a registration request message to the optical network unit;

The optical line terminal receives a registration response message sent by the optical network unit using the default uplink bit bearer table, and the registration response message includes the serial number of the optical network unit;

The optical line terminal determines that the optical network unit represented by the serial number has passed authentication and allocates an optical network unit identification to the optical network unit represented by the serial number;

The optical line terminal sends the optical network unit identification to the optical network unit.

6. An orthogonal frequency division multiplexing passive optical network registration activation method, characterized by including: the certified optical network unit receives the downlink training sequence sent by the optical line terminal; the optical network unit performs the following steps according to the downlink The training sequence calculates the downlink bit carrying table of the optical network unit;

The optical network unit sends the downlink bit bearer table and the uplink training sequence of the optical network unit to the optical line terminal, so that the optical line terminal calculates the uplink bit bearer of the optical network unit based on the uplink training sequence. table and calculate and update the system downlink bit bearer table and the system uplink bit bearer table according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit;

7. The method according to claim 6, characterized in that, the optical network unit calculates the downlink bit bearer table of the optical network unit according to the downlink training sequence, including: The optical network unit calculates the signal-to-noise ratio of each downlink subcarrier receiving the downlink training sequence according to the downlink training sequence;

The optical network unit calculates the downlink bit carrying table of the optical network unit based on the signal-to-noise ratio of each downlink subcarrier that receives the downlink training sequence.

8. The method according to claim 6 or 7, characterized in that, after the optical network unit receives and updates the downlink bit bearer table and the uplink bit bearer table sent by the optical line terminal, it further includes:

The optical network unit receives the second ranging request message sent by the optical line terminal; the optical network unit sends a second ranging response message to the optical line terminal, so that the optical line terminal obtains the second ranging request message. Ranging results.

9. The method according to any one of claims 6 to 8, characterized in that, before the certified optical network unit receives the downlink training sequence sent by the optical line terminal, it further includes:

The optical network unit receives the registration request message sent by the optical line terminal using the default downlink bit bearer table;

The optical network unit uses the default uplink bit bearer table to send a registration response message, and the registration response message includes the serial number of the optical network unit;

The optical network unit receives the optical network unit identification sent by the optical line terminal. The optical network unit identification is the representative of the serial number after the optical line terminal determines that the optical network unit represented by the serial number has passed authentication. of optical network units allocated.

10. An optical line terminal, characterized by: including:

The sending module is used to send the downlink training sequence to the certified optical network unit; the receiving module is used to receive the downlink bit bearing table and the uplink training sequence of the optical network unit sent by the optical network unit, the optical network The unit's downlink bit carrying table is calculated by the optical network unit based on the downlink training sequence;

A calculation module, configured to calculate the uplink bit bearing table of the optical network unit according to the uplink training sequence;

An update module, configured to calculate and update the system downlink bit bearer table and the system uplink bit bearer table according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit;

The sending module is also configured to send the system downlink bit bearer table to the optical network unit. and the system uplink bit bearer table, so that the optical network unit updates the system downlink bit bearer table and the system uplink bit bearer table.

11. The optical line terminal according to claim 10, wherein the calculation module is specifically configured to calculate the signal-to-noise ratio of each uplink subcarrier receiving the uplink training sequence according to the uplink training sequence; The signal-to-noise ratio of each uplink subcarrier of the uplink training sequence is calculated from the uplink bit bearing table of the optical network unit.

12. The optical line terminal according to claim 10 or 11, characterized in that the update module is specifically configured to use the same downlink subcarrier as the system downlink bit bearer table and the downlink bit bearer table of the optical network unit. The smaller one of the bit bearer values is used as the bit bearer value of the downlink subcarrier to update the system downlink bit bearer table; make the system uplink bit bearer table the same as the uplink bit bearer table of the optical network unit The smaller one of the bit bearer values of the subcarrier is used as the bit bearer value of the uplink subcarrier to update the system uplink bit bearer table; or the optical line terminal compares the uplink bit bearer table of the optical network unit with other The uplink bit bearer table of the optical network unit jointly serves as the system uplink bit bearer table.

13. The optical line terminal according to any one of claims 10 to 12, characterized in that the sending module is also used to send a second ranging request message to the optical network unit;

The receiving module is also configured to receive a second ranging response message sent by the optical network unit to obtain a second ranging result.

14. The optical line terminal according to any one of claims 10 to 13, characterized in that the sending module is also used to send a registration request message to the optical network unit using a default downlink bit bearer table;

The receiving module is also configured to receive a registration response message sent by the optical network unit using the default uplink bit bearer table, where the registration response message includes the serial number of the optical network unit; the optical line terminal also includes: The authentication module is used to determine that the optical network unit represented by the serial number has passed authentication and assigns an optical network unit identification to the optical network unit represented by the serial number; the sending module is also used to send the optical network unit to the optical network unit. The optical network unit identifier.

15. An optical network unit, characterized by: including:

The receiving module is used to receive the downlink training sequence sent by the optical line terminal;

A calculation module, configured to calculate the downlink bit bearing table of the optical network unit according to the downlink training sequence; A sending module, configured to send the downlink bit bearer table and the uplink training sequence of the optical network unit to the optical line terminal, so that the optical line terminal calculates the uplink bit bearer of the optical network unit according to the uplink training sequence. table and calculate and update the system downlink bit bearer table and the system uplink bit bearer table according to the downlink bit bearer table of the optical network unit and the uplink bit bearer table of the optical network unit;

An update module, configured to receive and update the system downlink bit bearer table and the system uplink bit bearer table sent by the optical line terminal.

16. The optical network unit according to claim 15, characterized in that: the calculation module is specifically configured to calculate the signal-to-noise ratio of each downlink subcarrier that receives the downlink training sequence according to the downlink training sequence; The signal-to-noise ratio of each downlink subcarrier of the downlink training sequence is used to calculate the downlink bit carrying table of the optical network unit.

17. The optical network unit according to claim 15 or 16, wherein the receiving module is further configured to receive the second ranging request message sent by the optical line terminal;

The sending module is also configured to send a second ranging response message to the optical line terminal, so that the optical line terminal obtains the second ranging result.

18. The optical network unit according to any one of claims 15 to 17, wherein the receiving module is further configured to receive a registration request message sent by the optical line terminal using the default downlink bit bearer table;

The sending module is also configured to send a registration response message using the default uplink bit bearer table, where the registration response message includes the serial number of the optical network unit;

The receiving module is also used to receive an optical network unit identifier sent by the optical line terminal. The optical network unit identifier is the optical network unit after the optical line terminal determines that the optical network unit represented by the serial number has passed the authentication. The serial number represents the assigned optical network unit.

19. An orthogonal frequency division multiplexing passive optical network system, characterized by: including:

The optical line terminal according to any one of claims 10 to 14;

At least one optical network unit as claimed in any one of claims 15 to 18;

Optical distribution network.