WO2012126410A2

WO2012126410A2 - Data transfer method, node and system

Info

Publication number: WO2012126410A2
Application number: PCT/CN2012/074746
Authority: WO
Inventors: 操时宜
Original assignee: 华为技术有限公司
Priority date: 2012-04-26
Filing date: 2012-04-26
Publication date: 2012-09-27
Also published as: CN102742229B; CN102742229A; WO2012126410A3

Abstract

Disclosed is a data transfer method, comprising: receiving first control information sent by an upstream node and receiving the OB sent by the upstream node taking the defined period as reference, wherein first marker information corresponding to the OB is included in the first control information; querying a marker forwarding table according to the first marker information to acquire the forwarding information about the OB; and forwarding the OB at the optical layer according to the forwarding information. Also disclosed are a corresponding node and a transfer system. During the implementation of the embodiments of the present invention, forwarding the OB according to the forwarding table is advantageous for realizing statistical multiplexing of bandwidth and improving the utilization efficiency of resources and further improving the throughput rate of the network, that is, increasing the optical layer forwarding ability and performance of the communication network.

Description

Data transmission method, node and system

The present invention relates to the field of optical communications, and in particular, to a data transmission method, a node, and a system.

Background technique

With the rise of high-bandwidth services and the growth in the number of broadband users, network traffic in communication networks has increased exponentially, resulting in ever-increasing demands on the capacity of routers in nodes. At present, in order to support the large capacity required by the communication network, the power consumption of the router has reached an unacceptable level, and the capital expenditure and operation cost are high. Therefore, reducing the power consumption and cost of the routers in the nodes, that is, reducing the power consumption and cost of the communication network nodes, is an urgent problem to be solved.

All-optical switching technology is considered to be a better solution to the problem of router power consumption and cost. All-optical switching technologies include: Optical Packet Switching (OPS) and Optical Burst Switching (OBS).

Different from the existing network, in the OPS and OBS technologies, the transmission particles are equal to the exchange particles, and the transmission and exchange of the service data are all performed in the optical layer, and the burst optical signal is transmitted on the line, as shown in FIG. OPS directly realizes the exchange of optical packets in the optical layer, and the optical packet duration is in the nanosecond range; OBSB' J aggregates the packets into bursts, and the optical layer realizes the exchange of optical bursts, and the optical burst duration is in microseconds to milliseconds. level. As can be seen from Figure 1, at the intermediate node, the service data only passes through the optical buffer, the fast optical switching matrix, and the wavelength conversion of the possible optical layer, etc., and does not require photoelectric conversion, thereby reducing the power consumption and cost of the node. .

Since both OPS and OBS technologies are based on a packet switching system, when applied to any network, especially a mesh (Mesh) network, an arbitrary random access memory (RAM) is required. Cache, but flexible optical cache implementation is difficult, and OPS and OBS technologies are not expected to be practical on Mesh networks for a long time. That is to say, with the proposed OPS and OBS technologies, the optical layer conflicts are severe and the network throughput rate is low. Summary of the invention

The technical problem to be solved by the present invention is to provide a data transmission method, node and system to reduce optical layer conflict and improve network throughput. In order to solve the above technical problem, an embodiment of the present invention provides a data transmission method, including: receiving first control information sent by an upstream node, and receiving an OB sent by the upstream node according to a determined period, where the The first tag information corresponding to the OB is included in a control information;

Querying the label forwarding table according to the first label information, acquiring forwarding information of the OB; and forwarding the OB in the optical layer according to the forwarding information.

Correspondingly, the embodiment of the present invention further provides another method for data transmission, including:

Receiving the input service data, and encapsulating the service data to generate an OB;

Acquiring the first tag information corresponding to the OB; and querying the tag forwarding table to obtain forwarding information corresponding to the OB;

And the first tag information corresponding to the OB is encapsulated into the first control information, and the first control information is sent to the downstream node according to the forwarding information; and the method is sent according to the determined period of the forwarding information. OB to the downstream node.

Correspondingly, the embodiment of the present invention further provides a node, including a receiving unit, a maintenance unit, a forwarding information acquiring unit, and a forwarding unit, where:

a receiving unit, configured to receive the first control information sent by the upstream node, and receive the OB sent by the upstream node as a reference, where the first control information includes the first tag information corresponding to the OB;

And a forwarding information obtaining unit, configured to query, according to the first tag information, the tag forwarding table received by the receiving unit, to obtain forwarding information of the OB;

a maintenance unit, configured to establish and/or maintain a tag forwarding table, and obtain the forwarding information from the tag forwarding table according to the query request;

And a forwarding unit, configured to forward the OB received by the receiving unit to the optical layer according to the forwarding information acquired by the forwarding information acquiring unit.

The OB generating unit, the OB generating unit, Receiving the input service data, encapsulating the service data, and generating an OB;

The tag information acquiring unit is configured to acquire first tag information corresponding to the OB generated by the OB generating unit;

The maintenance unit is configured to establish and/or defend a tag forwarding table; The forwarding information obtaining unit is configured to query the label forwarding table to obtain forwarding information corresponding to the OB;

The encapsulating unit is configured to encapsulate the first tag information corresponding to the OB into the first control information;

The sending unit is configured to send the first control information to a downstream node according to the forwarding information, and send the OB to a downstream node according to a determined period of the forwarding information.

In the embodiment of the present invention, the intermediate node in the data transmission receives the OB sent by the upstream node by receiving the first control information of the upstream node and using the determined period as a reference, and then performs forwarding. In this way, bandwidth control and time slot grooming can be implemented based on the determined period, thereby reducing optical layer collision probability or eliminating optical layer collision, and improving network throughput. In the embodiment, the OB is forwarded through the forwarding table, which facilitates statistical multiplexing of bandwidth, improves resource utilization efficiency, and further improves network throughput, that is, improves optical layer forwarding capability and performance of the communication network. . BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in the claims Other drawings may also be obtained from these drawings without the use of creative labor.

1 is a schematic structural diagram of a communication network in the prior art; FIG. 2 is a schematic structural diagram of a communication network according to an embodiment of the present invention; FIG. 3 is a schematic diagram of an embodiment of an embodiment 0B and control information according to the present invention; FIG. 5 is a schematic flowchart diagram of a first embodiment of a data transmission method according to the present invention; FIG. 6 is a schematic flowchart diagram of a second embodiment of a data transmission method according to the present invention; A schematic diagram of a first embodiment of a node device provided by the present invention; FIG. 8 is a schematic diagram of a composition of a tag information acquiring unit in a first embodiment of a node device according to the present invention; FIG. 9 is a schematic diagram showing the composition of a second embodiment of a node device according to the present invention. detailed description

BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions in the embodiments of the present invention will be described in detail with reference to the accompanying drawings. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative work are within the scope of the present invention.

The technical solutions of the embodiments of the present invention are further described in detail below through the accompanying drawings and embodiments. FIG. 2 is a schematic structural diagram of a communication network according to an embodiment of the present invention. As shown in FIG. 2, the communication network consists of at least two edge nodes (edge node A and edge node B) and at least one intermediate node. It should be noted that, in an actual network system, it is also possible to include only two edge nodes, and the edge nodes are directly interconnected without an intermediate node. In addition, one edge node may be connected to two or more intermediate nodes. It is also possible for intermediate nodes to be connected to two or more edge nodes.

In Figure 2, edge node A includes processing in both directions of the line transmitting side and the line receiving side (referred to as a two-way network). The line side refers to the side where the device and the device are connected to the network, which corresponds to the client side, and the client side refers to the side where the device accesses the client signal.

It should be noted that the network can only support one-way processing. For example, the edge node A only includes the processing of the service data on the line sending side, and the edge node B only includes the processing of the service data on the line receiving side (in the one-way network, some control) The processing of information may still be two-way). This kind of application situation still exists in the existing network, and the cylinderization of the corresponding equipment is also obvious, so it will not be described again.

Taking the line sending direction of the edge node A as an example to illustrate the process of service data transmission and processing (it is obvious that the processing of the line receiving direction of the edge node A is similar, and will not be described again):

After the edge node A accesses the service data input by the client side, the service data is encapsulated into 0B (0pt i ca l Bur st, light burst)

And encapsulating the corresponding control related information into the first control information; then, the edge node A sends the OB and the control information to the network, and sends the information to the intermediate node. Wherein, the edge node sends 0B in a determined period. Further, the first control information includes the first tag information corresponding to the 0B, and the first control information or the first tag information can carry the location information of the 0B in the determined period.

The intermediate node receives the first control information sent by the edge node A, and receives the OB sent by the edge node A based on the determined period, where the first control information includes the first label information corresponding to the OB; A tag information query tag forwarding table obtains forwarding information of the OB; and forwards the OB to the optical layer according to the forwarding information. As described above, the first control information or the first tag information sent by the edge node carries the location information of the OB corresponding to the tag information in the determined period, so the first node receives the first information. The control information or the first tag information also has the same characteristics.

Further, acquiring, according to the forwarding information, second marking information corresponding to the 0B;

The second tag information is encapsulated into the second control information, the second control information is transmitted to the downstream node, and the 0B is transmitted to the downstream node based on the determined period.

The edge node B receives the second control information sent by the intermediate node, and receives the 0B sent by the intermediate node based on the determined period;

The received 0B from the upstream node is decapsulated, and the outputted business data is extracted. It can be understood that, in the above network, there may be multiple intermediate nodes, and the edge node B receives the control information and 0B sent by the intermediate node directly connected thereto. In this case, the related processing of each node in the network is similar and will not be described again.

Further, it is also possible that there is no intermediate node in the network, and the edge node B directly receives the edge. The first control information sent by the edge node A and the associated processing of the edge node A and the edge node B are similar, and will not be described again. As shown in FIG. 5, it is a schematic flowchart of a first embodiment of a data transmission method provided by the present invention. The method is applied to an intermediate node in a communication network, and the data transmission method includes: Step S101: Receive first control information sent by an upstream node. Receiving, by the determined period, the OB sent by the upstream node, where the first control information includes the first label information corresponding to the OB;

For example, in this embodiment, the first control information or the first tag information carries location information of the OB corresponding to the first tag information in the determined period.

3 is a schematic diagram of an embodiment of 0B and control information according to the present invention. In this embodiment, the first control information carries location information indicating that the 0B is in a determined period.

As shown in Figure 3, both control information and 0B are transmitted (and received) using a determined period. Obviously, as long as the timing between the control information and the 0B can be properly arranged, the control information can also be sent without using a certain period. For example, a delay field is added to the control information to indicate the delay relationship between the control information and the 0B. (In this case, the control information is not sent in a determined cycle). The control information is also transmitted using a determined period, which facilitates the node to perform synchronization timing, tube control information processing, and the like.

In Figure 3, the length of 0B in one cycle can be different, and different 0Bs may represent different connection relationships. For example, 0B1 represents 0B sent by edge node A and required to be received by edge node B; 0B2 represents 0B sent by another edge node C and needs to be received by another edge node D;

However, as long as each node in the network processes 0B according to a certain period, each node can accurately know the utilization of the bandwidth resources, and can perform corresponding operations according to the determined and determined period, thereby evading the light. Layer conflicts or minimize optical layer conflicts. In this embodiment, it can be known from the single reasoning that as long as the distribution information of 0B is known in advance through the control information, the optical layer collision can be avoided.

In Fig. 3, the position information of 0B is indicated by the start position and the end position in the control information, that is, the control information carries the position information of 0B in the determined period.

Obviously, in Fig. 3, the length of 0B may of course be the same.

4 is a schematic diagram of still another embodiment of the OB and control information of the present invention, as shown in FIG. In an embodiment, the first tag information carries sequence information indicating the 0Β in the determined period. The first control information and 0Β are both transmitted in a determined period, and the lengths of the 0Β are all determined and identical. Different 0Β may correspond to different source and sink. For example, 0B1 represents an OB sent by the edge node 需要 that requires the edge node B to receive; 0B2 represents another OB that is sent by the edge node C and needs to be received by another edge node D;

In FIG. 4, the specific implementation manner of the tag information is a label, and the label is applicable to a case where an MPLS-related protocol is used. Obviously, if an IP forwarding protocol is adopted, the tag information may be an IP address or the like. In the present embodiment, since the length of 0B is determined and the same, the order information of 0B in the determination period can indicate its position information. For example, first, knowing the bit rate of optical signal transmission, based on the determined period value (in units of time), you can know how many bytes are included in one cycle (so the following description is done in bytes. For the unit of the cycle). Assuming that the length of 0B is X bytes, and the interval between 0B is y bytes, then as long as the description is the zth 0B in the determination period (calculated from 1), it can be known that the zth 0B is from the Determine the (z-1) * (x + y) of the period +1 byte begins, to the end of (zl) * (x + y) + x bytes. The zth OB described above is the order information of 0B in the determination period, and the position information is from the first byte of the determined period to the end of the first byte. Therefore, in the present embodiment, the flag information is actually used to indicate the order information of the 0B in the determined period, thereby indirectly indicating the position information of the 0B in the determined period. Preferably, in this embodiment, the node may receive the first control information sent by the upstream node based on the determined period. Since the length of each field in the control information can be determined in advance, the flag information corresponding to the 0B (label in FIG. 4) can be placed in the same order as the determination period by the 0B corresponding to the control information. For example, in FIG. 4, the label 1 corresponds to 0B1, the label 2 corresponds to 0B2, and the like. Therefore, in the present embodiment, the flag information actually indicates the order information of 0B in the determined period in the same order as 0B in the determined period, thereby indirectly indicating 0B in the determined Location information in the cycle.

Obviously, those skilled in the art should understand that in the present embodiment, it is not necessary that the mark information and the order of 0B in the determined cycle are the same. For example, the tag information may be determined by using the corresponding 0B. The reverse order in the cycle indicates the order information of OB in the determined period (eg, label n and OB1 correspondence, label 1 and OBn correspondence, etc.).

The order information of the corresponding OB in the determined period is indicated by the order of the marker information in the determined period, in particular, the same order is used, and the processing of the control information (marker information) can be compressed. Thereby improving the speed of control information processing, speeding up the forwarding speed, thereby improving the network throughput rate (reducing the optical layer collision probability or eliminating the optical layer conflict).

In particular, 0B transmits (and receives) with a determined period, and particularly in the present embodiment, the length of 0B is determined and the same, which can greatly reduce the optical layer collision probability and even eliminate optical layer collision.

For example, the time slot scheduling function is set in the intermediate node, which can implement the non-blocking scheduling of the 0B time slot in this embodiment, that is, the 0B in the same cycle can be arbitrarily scheduled to any time slot in the optical layer (for example, 0B1 scheduling to 0B4) The corresponding time slot, OBn is scheduled to the time slot corresponding to 0B1, and so on). The length of 0B is determined, which means that the delay unit with a certain length can be delayed in the optical layer. The number of 0B in one cycle is limited, which means that the optical delay unit required for non-blocking time slot scheduling is realized. The quantity is limited. These all help to construct a practical, relatively single slot scheduling unit to solve the optical layer collision problem: After constructing a non-blocking time slot scheduling unit, you can use the corresponding control plane technology, such as extending RSVP-TE ( The Resource Reservation Protocol (TRAF ic Eng ineering) supports the allocation of bandwidth (the number of 0Bs that can be quantized into one cycle), thus completely avoiding optical layer collisions. Of course, it is also possible to carry out some extensions on this basis, relax the strict control of bandwidth, and take a flat between the service transmission delay and the network throughput rate. Step S102: Query the tag forwarding table according to the first tag information, and obtain forwarding information of the OB. Here, the label forwarding table in this embodiment may be pre-configured, or may be generated according to related information such as a routing protocol, a label distribution protocol, and the like. For example, the label forwarding table may be a Forward Information Base (FIB) similar to the IP forwarding technology, or a label forwarding information base (LFIB) in the MPLS switching technology.

In an embodiment in which the IP forwarding protocol is adopted, the tag information includes an IP address and a MAC address, and is generated according to a routing protocol related signaling packet and link layer operation, management, and maintenance (OAM) operation, administration and maintenance information. A routing information table (RIB) is generated, and a forwarding information base (FIB) is generated according to the routing information table (RIB).

In the embodiment adopting the MPLS exchange protocol, the tag information is an MPLS label, and a routing information table (RIB) is generated according to a routing protocol related signaling packet and link layer OAM information, and then according to a routing information table (RIB) and a label. A signaling packet related to the LDP (label distribution protocol) and a link layer OAM information generation label forwarding information table (LFIB).

In this embodiment, after receiving the first control information from the upstream node, the signaling packet and the OAM information of the OB layer are extracted from the first control information; and the OAM information of the OB layer is converted into a chain. The OAM information of the layer layer; and establishing and/or updating the label forwarding table according to the OAM information of the signaling packet and the link layer.

In this embodiment, after the step of obtaining the forwarding information of the OB according to the first tag information query tag forwarding table, the step further includes: acquiring, according to the forwarding information, the OB corresponding to the OB And marking the second tag information into the second control information, transmitting the second control information to the downstream node, and transmitting the OB to the downstream node based on the determined period. Preferably, the second control information is transmitted to the downstream node based on the determined period.

When the Internet Protocol (IP) forwarding protocol is adopted, the acquiring the second tag information corresponding to the OB according to the forwarding information may be implemented by:

Obtaining a new media access control (MAC) address and an IP address according to the forwarding information, replacing the original MAC address and the IP address in the first tag information with the new MAC address and the IP address, and generating the OB corresponding Second mark information; When the multi-label switching (MPLS) protocol is adopted, the second tag information corresponding to the OB is directly extracted from the forwarding information. Further, in this embodiment, a new signaling packet may be generated by using a related signaling protocol, and new link layer OAM information is generated, and the new link layer OAM information is converted into a new OB layer OAM information. The new signaling packet and the new OB layer OAM information are further encapsulated into the second control information.

Here, the second control information is similar to the first control information, and the second control information or the second tag information may carry the OB corresponding to the second tag information in the determined period. Location information in .

Step S103: Forward the OB in the optical layer according to the forwarding information.

In a specific implementation, the OB may be forwarded based on the determined period. When the OB is sent by another upstream node based on the determined period of the node, the OB from the upstream node and/or the OB from the other upstream node are delayed at the optical layer, so that the upstream The count start position of the determined period corresponding to the OB of the node and the OB from the other upstream node is aligned or maintained for a determined time interval. A person skilled in the art should understand that when the OBs sent by other multiple upstream nodes are received on the basis of the determined period of the node, the delay processing is performed, thereby ensuring the corresponding OBs of the multiple upstream nodes. The count start position of the determined period is aligned or maintained for a determined time interval. In the specific implementation, the optical delay processing and the optical layer forwarding of the OB may be performed sequentially through different devices, or the optical delay and optical layer forwarding may be simultaneously implemented in the same physical device.

In this embodiment, the OB sent by the upstream node is received on the basis of the determined period, and then forwarded. In this way, bandwidth control and time slot grooming can be implemented based on the determined period, thereby reducing optical layer collision probability or eliminating optical layer collision, and improving network throughput. For the method of reducing the optical layer collision probability or eliminating the optical layer conflict, refer to the description of the corresponding embodiment in FIG. 3 and FIG. 4, and details are not described herein again. In the embodiment, the OB is forwarded through the forwarding table, which facilitates statistical multiplexing of bandwidth, improves resource utilization efficiency, and further improves network throughput, that is, improves optical layer forwarding capability and performance of the communication network. .

As shown in FIG. 6, it is a schematic flowchart of a second embodiment of a data transmission method provided by the present invention. The method method applies an edge node in a communication network, and the data transmission method includes:

In step S201, the input service data is received, and the service data is encapsulated to generate an OB. Here, the input service data is service data from the client side.

Step S202, acquiring tag information corresponding to the OB; and querying the tag forwarding table to obtain the OB Corresponding forwarding information;

Here, the label forwarding table is the same as in the first embodiment of the data transmission method provided by the present invention, and details are not described herein.

Step S203, the first tag information corresponding to the OB is encapsulated into the first control information, and the first control information is sent to the downstream node according to the forwarding information; and the determined period according to the forwarding information is The reference sends the OB to the downstream node.

Optionally, in the embodiment, the first control information or the first tag information carries location information of the OB corresponding to the first tag information in the determined period. For a specific implementation method, refer to the first embodiment of the data transmission method provided by the present invention, and details are not described herein again.

Preferably, in this embodiment, the first control information is transmitted to the downstream node based on the determined period according to the forwarding information. According to the first embodiment of the data transmission method provided by the present invention, the control information may also be transmitted based on a determined period.

The length of the OB is determined; the first control information or the first tag information carries sequence information of the OB of the first tag information tag in the determined period; or the first tag information The order in the determined period and the OB of the first mark information flag are the same in the determined period. For a specific implementation, refer to the first embodiment of the data transmission method provided by the present invention.

In addition, in this embodiment, the edge node may further generate a first signaling packet according to the relevant signaling protocol, and generate first link layer OAM information, and convert the first link layer OAM information into OB layer OAM information, The first signaling packet and the OB layer OAM information are further encapsulated into the first control information.

In this embodiment, the edge node further receives the second control information sent by the upstream node, and receives the OB sent by the upstream node based on the determined period, and further solves the received OB from the upstream node. Encapsulate, extract the output business data.

Further, the node further extracts the second signaling packet and the OB layer OAM information from the received second control information, and converts the extracted OB layer OAM information into the second link layer OAM information, And further, the tag forwarding table is established and/or updated according to the second signaling packet and/or the second link layer OAM information.

Optionally, the node may receive the second control information sent by the upstream node based on the determined period.

As shown in FIG. 7 , it is a schematic diagram of a first embodiment of a node device provided by the present invention. The node device is an intermediate node in a communication network, and the node includes, and includes, a receiving unit 11 and a maintenance unit 12 . The forwarding information obtaining unit 13 and the forwarding unit 14 are:

The receiving unit 11 is configured to receive the first control information sent by the upstream node, and receive the OB sent by the upstream node as a reference, where the first control information includes the first tag information corresponding to the OB. The receiving unit 11 includes:

The OB receiving unit 111 receives the OB sent by the upstream node based on the determined period. The control information receiving unit 112 is configured to receive the first control information sent by the upstream node, where the first control information includes the first tag information corresponding to the OB received by the OB receiving unit. .

Optionally, the first control information or the first tag information carries location information of the OB corresponding to the first tag information in the determined period. For a specific implementation method, reference may be made to the first embodiment of the data transmission method provided by the present invention, and details are not described herein again.

The forwarding information obtaining unit 13 is configured to obtain the forwarding information of the OB according to the first tag information query tag forwarding table received by the receiving unit.

The maintenance unit 12 is configured to establish and/or maintain a tag forwarding table, and obtain the forwarding information from the tag forwarding table according to the query request.

The forwarding unit 14 is configured to forward the OB received by the receiving unit to the optical layer according to the forwarding information acquired by the forwarding information acquiring unit.

Further, the node further includes:

The tag information obtaining unit 15 is configured to acquire the second tag information corresponding to the OB according to the forwarding information acquired by the forwarding information acquiring unit.

The information encapsulating unit 16 is configured to encapsulate the second tag information acquired by the tag information acquiring unit into the second control information.

The transmitting unit 17 is configured to transmit the second control information to the downstream node, and transmit the OB forwarded by the forwarding unit to the downstream node based on the determined period. In a specific implementation, the sending unit 17 includes:

The OB sending unit 171 transmits the OB forwarded by the forwarding unit to the downstream node based on the determined period.

The control information transmitting unit 172 transmits the second control information to the downstream node based on the determined period.

Optionally, the OB receiving unit 171 is further configured to receive another upstream based on the determined period. The OB sent by the node; further, the node further includes:

a first optical delay unit 18, configured to delay, at the optical layer, the OB from the upstream node and/or the OB from another upstream node received from the OB receiving unit, so that the OB from the upstream node Corresponding to the counting start position of the determined period corresponding to each of the OBs from another upstream node, or maintaining the determined time interval, and delaying the processing of the OB from the upstream node and the An OB of an upstream node is transmitted to the forwarding unit.

It should be noted that, in specific implementation, the first optical delay unit may also be combined with the forwarding unit, that is, the forwarding and optical delay are simultaneously implemented in one unit.

Referring to FIG. 8, when the Internet Protocol (IP) forwarding protocol is adopted, the tag information acquiring unit 15 includes:

The address obtaining unit 151 is configured to obtain a new media access control MAC address and an IP address according to the forwarding information acquired by the forwarding information acquiring unit.

The tag information generating unit 152 is configured to replace the original MAC address and the IP address in the first tag information according to the new MAC address and IP address acquired by the address obtaining unit, and generate a second tag corresponding to the OB. Information

When the multi-label switching (MPLS) protocol is adopted, the tag information acquiring unit 15 extracts the second tag information corresponding to the OB from the forwarding information of the OB acquired by the forwarding information acquiring unit 13.

Optionally, the node further includes:

The information extracting unit 19 is configured to extract, from the first control information received by the receiving unit, the signaling packet and the OAM information of the OB layer;

The OAM information conversion unit 110 is configured to convert OAM information of the OB layer extracted by the information extraction unit into OAM information of the link layer;

The maintenance module 12 is further configured to establish and/or update the label forwarding table according to the OAM information of the link layer from the OAM information conversion unit 110 according to the signaling information and the OAM information of the link layer.

As shown in FIG. 9 , it is a schematic diagram of a second embodiment of a node device provided by the present invention. The node includes an OB generating unit 21, a tag information acquiring unit 22, a maintenance unit 23, a forwarding information acquiring unit 24, and a packaging unit 25. And a sending unit 26, wherein:

The OB generating unit 21 is configured to receive input service data, and encapsulate the service data to generate an OB. The tag information acquiring unit 22 is configured to acquire first tag information corresponding to the OB generated by the OB generating unit;

The maintenance unit 23 is configured to establish and/or maintain a tag forwarding table;

The forwarding information obtaining unit 24 is configured to query the label forwarding table to obtain forwarding information corresponding to the OB.

The encapsulating unit 25 is configured to encapsulate the first tag information corresponding to the OB into the first control information;

The sending unit 26 is configured to send the first control information to the downstream node according to the forwarding information, and send the OB to the downstream node according to the determined period of the forwarding information. In a specific implementation, the sending unit 26 further includes:

a control information sending unit 261, configured to transmit the first control information to a downstream node based on the determined period;

The OB sending unit 262 is configured to send the OB to the downstream node according to the determined period of the forwarding information.

The node also includes:

a signaling packet generating unit 27, configured to generate a first signaling packet;

The OAM information generating unit 28 is configured to generate first link layer OAM information.

An OAM information conversion unit 29, configured to use the first link layer generated by the OAM information generating unit

Convert OAM information into OB layer OAM information;

The encapsulating unit 25 is further configured to encapsulate the first signaling packet from the signaling packet generating unit 28 and the OB layer OAM information from the OAM information converting unit 29 into the first control information.

The node also includes:

The receiving unit 30 is configured to receive the second control information sent by the upstream node and receive the OB sent by the upstream node as a reference.

The OB decapsulation unit 32 is configured to decapsulate the OB received by the OB receiving unit to extract service data.

The extracting unit 33 is configured to extract, from the second control information received by the control information receiving unit, a second signaling packet and OB layer OAM information;

The OAM information conversion unit 29 is further configured to convert the extracted OB layer OAM information into second link layer OAM information. The maintenance unit 23 is further configured to establish and/or update the label forwarding table according to the second signaling packet and/or the second link layer OAM information.

In a specific implementation, the receiving unit 30 includes:

The control information receiving unit 301 is configured to receive second control information sent by the upstream node;

The OB receiving unit 302 is configured to receive the OB sent by the upstream node based on the determined period; those skilled in the art may understand that all or part of the processes in implementing the foregoing embodiments may be related by a computer program. The hardware is used to complete, and the program can be stored in a computer readable storage medium, and when executed, the program can include the flow of an embodiment of the methods described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and the equivalent changes made by the claims of the present invention are still within the scope of the present invention.

Claims

Rights request

A method for data transmission, comprising:

Receiving the first control information sent by the upstream node, and receiving the optical burst OB sent by the upstream node, and the first control information includes first marking information corresponding to the OB according to the determined period; The first tag information query tag forwarding table acquires forwarding information of the OB; and forwards the OB in an optical layer according to the forwarding information.

The method according to claim 1, wherein the first control information or the first tag information carries location information of the OB corresponding to the first tag information in the determined period. .

The method according to any one of claims 1-2, wherein the step of: querying the tag forwarding table according to the first tag information, and acquiring the forwarding information of the OB further comprises:

Acquiring the second tag information corresponding to the OB according to the forwarding information;

The second tag information is encapsulated into the second control information, the second control information is transmitted to the downstream node, and the OB is transmitted to the downstream node based on the determined period.

The method according to any one of claims 1-2, wherein the step of receiving the first control information sent by the upstream node is:

Receiving, by the determined period, a first control information sent by the upstream node.

The method according to any one of claims 1 to 2, wherein the length of the OB is determined;

The first control information or the first tag information carries sequence information of the OB of the first tag information tag in the determined period.

The method according to any one of claims 1 to 2, wherein the length of the OB is determined, the order of the first mark information in the determined period and the first mark Information tag The OBs are in the same order in the determined cycle.

The method according to any one of claims 1 to 6, wherein the method further comprises: receiving an OB sent by another upstream node based on the determined period;

Before the step of forwarding the OB in the optical layer according to the forwarding information, the method further includes: delaying, by the optical layer, the OB from the upstream node and/or the OB from another upstream node, so that the The count start position of the determined period corresponding to the OB from the upstream node and the OB from the other upstream node is aligned or maintained for a determined time interval.

8. The method of claim 3, wherein

When the Internet Protocol IP forwarding protocol is adopted, the step of acquiring the second tag information corresponding to the OB according to the forwarding information is:

Obtaining a new media access control MAC address and a new IP address according to the first forwarding information, and replacing the original MAC address and the IP address in the first tag information with the new MAC address and the new IP address. Generating second marking information corresponding to the OB;

When the multi-label switching MPLS protocol is adopted, the step of acquiring the second tag information corresponding to the OB according to the forwarding information is:

Extracting the second tag information corresponding to the OB from the forwarding information.

The method according to any one of claims 1 to 6, wherein the step of receiving the first control information sent by the upstream node further comprises:

Extracting signaling packets and OAM information of the OB layer from the first control information;

Converting OAM information of the OB layer into OAM information of the link layer; and

A tag forwarding table is established and/or updated according to the signaling packets and OAM information of the link layer.

The method according to any one of claims 3 to 3, wherein the step of transmitting the second control information to the downstream node further comprises:

Generate a new signaling packet;

Generating new link layer OAM information, converting the new link layer OAM information into a new OB Layer OAM information;

The new signaling packet and the new OB layer OAM information are encapsulated into the second control information.

11. A method of data transfer, comprising:

The method according to claim 11, wherein the first control information or the first tag information carries location information of the OB corresponding to the first tag information in the determined period. .

The method according to any one of claims 11 to 12, wherein the step of transmitting the first control information to the downstream node according to the forwarding information is specifically:

The first control information is transmitted to the downstream node based on the determined period of the forwarding information.

The method according to any one of claims 11 to 12, wherein the length of the OB is determined;

The method according to any one of claims 11 to 12, wherein the order of the first mark information in the determined period and the OB of the first mark information mark are in a determined period The order is the same.

The method according to any one of claims 11 to 15, wherein the step of transmitting the first control information to the downstream node according to the forwarding information further comprises:

Generating a first signaling packet;

Generating first link layer OAM information, and converting the first link layer OAM information into OB layer OAM information;

The first signaling packet and the OB layer OAM information are encapsulated into the first control information.

The method of any one of the preceding claims, further comprising: receiving second control information sent by the upstream node, and receiving the OB sent by the upstream node based on the determined period;

The received OB from the upstream node is decapsulated, and the outputted business data is extracted.

The method according to claim 17, wherein the step of receiving the second control information sent by the upstream node further comprises:

And extracting, by the input second control information, the second signaling packet and the OB layer OAM information, and converting the extracted OB layer OAM information into the second link layer OAM information.

And establishing and/or updating the tag forwarding table according to the second signaling packet and/or the second link layer OAM information.

A node, comprising: a receiving unit, a maintenance unit, a forwarding information acquiring unit, and a forwarding unit, wherein:

a forwarding unit, configured to send, according to the forwarding information acquired by the forwarding information acquiring unit, the receiving The OB received by the element is forwarded at the optical layer.

The node according to claim 19, wherein the first control information or the first tag information carries location information of the OB corresponding to the first tag information in the determined period.

The node according to any one of claims 19 to 20, further comprising: a tag information acquiring unit, configured to acquire, according to the forwarding information acquired by the forwarding information acquiring unit, the OB corresponding to the OB Second mark information;

An information encapsulating unit, configured to encapsulate the second tag information acquired by the tag information acquiring unit into the second control information;

And a sending unit, configured to: send the second control information to the downstream node, and transmit the OB forwarded by the forwarding unit to the downstream node as a reference.

The node according to any one of claims 19 to 21, wherein the receiving unit comprises:

The OB receiving unit is configured to receive the OB sent by the upstream node based on the determined period. And a control information receiving unit, configured to receive, by using the determined period, a first control information sent by the upstream node, where the first control information includes first tag information corresponding to an OB received by the OB receiving unit.

The node according to any one of claims 19 to 21, wherein the transmitting unit comprises:

An OB sending unit, configured to transmit, by using the determined period, an OB forwarded by the forwarding unit to a downstream node;

The control information transmitting unit transmits the second control information to the downstream node based on the determined period.

The node according to any one of claims 19 to 21, wherein the OB receiving order The element is further used to receive an OB sent by another upstream node based on the determined period;

The node further includes:

a first optical delay unit, configured to delay, at the optical layer, the OB from the upstream node and/or the OB from another upstream node received by the OB receiving unit, so that the OB corresponding to the upstream node corresponds to Aligning or maintaining the determined start time interval of the determined period corresponding to each of the OBs from another upstream node, and delaying the processed OB from the upstream node and the other from the other The OB of the upstream node is transferred to the forwarding unit.

The node according to any one of claims 19 to 24, characterized in that

When the Internet Protocol IP forwarding protocol is adopted, the tag information acquiring unit includes:

An address obtaining unit, configured to acquire a new media access control MAC address and an IP address according to the forwarding information acquired by the forwarding information acquiring unit; and replace the original MAC address and the IP address in the first tag information with the IP address, and generate an Describe the second tag information corresponding to the OB;

When the multi-label switching MPLS protocol is adopted, the tag information acquiring unit extracts the second tag information corresponding to the OB from the forwarding information of the OB acquired by the forwarding information acquiring unit.

The node according to any one of claims 19 to 24, wherein the node further comprises: an information extracting unit, configured to extract a signaling packet from the first control information received by the receiving unit And OAM information of the OB layer;

An OAM information conversion unit, configured to convert OAM information of the OB layer extracted by the information extracting unit into OAM information of the link layer;

The maintenance module is further configured to establish and/or update a label forwarding table according to the OAM information of the link layer from the OAM information conversion unit according to the OAM information of the signaling packet and the link layer.

The node according to any one of claims 19 to 20, wherein the length of the OB is determined;

The first control information or the first tag information carries the first tag information tag Sequence information of the OB in the determined period.

The node according to any one of claims 19 to 20, wherein the length of the OB is determined, the order of the first tag information in the determined period, and the first flag The OBs of the information tag are in the same order in the determined cycle.

A node, comprising: an OB generating unit, a tag information acquiring unit, a maintenance unit, a forwarding information acquiring unit, a packaging unit, and a sending unit, wherein:

The OB generating unit is configured to receive input service data, and encapsulate the service data to generate an OB.

The maintenance unit is configured to establish and/or maintain a tag forwarding table;

The forwarding information obtaining unit is configured to query the label forwarding table to obtain forwarding information corresponding to the OB;

The node according to claim 29, wherein the first control information or the first tag information carries location information of the OB corresponding to the first tag information in the determined period. .

The node according to any one of claims 29 to 30, wherein the sending unit further comprises:

a control information sending unit, configured to transmit the first control information to a downstream node based on the determined period;

An OB sending unit, configured to send the OB to the reference according to the determined period of the forwarding information Downstream node.

The node according to any one of claims 29 to 31, wherein the node further comprises: a signaling packet generating unit, configured to generate a first signaling packet;

An OAM information generating unit, configured to generate first link layer OAM information;

An OAM information conversion unit, configured to convert the first link layer OAM information generated by the OAM information generating unit into OB layer OAM information;

The encapsulating unit is further configured to encapsulate the first signaling packet from the signaling packet generating unit and the OB layer OAM information from the OAM information converting unit into the first control information.

The node according to any one of claims 29 to 31, further comprising: a receiving unit, configured to receive second control information sent by the upstream node, and receive the upstream according to the determined period The OB sent by the node.

34. The node of claim 33, the receiving unit comprising:

a control information receiving unit, configured to receive second control information sent by the upstream node;

An OB receiving unit, configured to receive an OB sent by the upstream node, according to the determined period; the node further includes:

The OB decapsulation unit is configured to decapsulate the OB received by the OB receiving unit to extract service data.

The node according to claim 34, wherein the node device further comprises: an extracting unit, configured to extract a second signaling packet and an OB from the second control information received by the control information receiving unit Layer OAM information;

The OAM information conversion unit is further configured to convert the extracted OB layer OAM information into second link layer OAM information.

The maintenance unit is further configured to establish and/or update the label forwarding table according to the second signaling packet and/or the second link layer OAM information.

36. The node of claim 30, wherein:

The length of the OB is determined;

37. The node of claim 30, wherein:

The length of the OB is determined;

The order of the first mark information in the determined period and the order of the OB of the first mark information mark in the determined period are the same.

38. A data transfer system, comprising at least two nodes as claimed in claims 29-36.

39. A data transmission system as claimed in claim 38, characterized in that it further comprises at least one node according to claims 19-28.