WO2007006220A1

WO2007006220A1 - A method for finding adjacent station and establishing connection with adjacent station by coexistence bs when initializing

Info

Publication number: WO2007006220A1
Application number: PCT/CN2006/001613
Authority: WO
Inventors: Xuyong Wu; Ruobin Zheng
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2005-07-08
Filing date: 2006-07-07
Publication date: 2007-01-18
Also published as: CN100502548C; CN1863366A

Abstract

A method for finding adjacent station and establishing connection with adjacent station by coexistence BS when initializing, the method comprises: setting a DCTFS (downlink coexistence dedicated time frequency piece) in downlink frame structure of the coexistence BS; the BS started up newly transmits connection request message to terminals located in the overlapped area with adjacent station by utilizing said DCTFS, finding adjacent station and establishing connection with the adjacent station In accordance with the connection message returned. By using the method of the present invention, coexistence BS can find adjacent station quickly and establish connection and the adjacent station when initializing.

Description

Method for coexisting base station to discover neighboring stations and establish contact with neighboring stations at initialization time

The present invention relates to the field of communications, and in particular, to a method for coexistence base stations to discover neighboring stations and establish contact with neighboring stations at initialization. Background of the invention

Broadband wireless access BWA (Broadband wireless access) devices can provide users with convenient broadband access. There are currently broadband wireless access devices based on proprietary protocols, as well as broadband wireless access devices based on standard protocols. Broadband wireless access technology is currently booming, and the technology of using broadband resources to carry out broadband metro access has strong vitality and market space.

In wireless communication systems, wireless spectrum resources are invaluable. Especially in some areas that are not well planned or some networks that have unlicensed frequency bands, there are often multiple base stations operating on the same channel, resulting in signal phase mutual interference of different base stations. Therefore, in order to coordinate the coexistence between the base station devices in the same frequency band, especially between the base station devices on the unlicensed frequency band, it is necessary to establish a coexistence mechanism between the base station devices.

Before introducing the existing coexistence base station system, we first introduce the definition of the neighbor station.

A neighboring station is a base station that has a common coverage area and that has a valid terminal in the common coverage area. For example, in the network shown in FIG. 1, although BS1 and BS2 are geographically close, and the BS1 and BS2 stations themselves are each in the coverage area of the other party, since there is no valid terminal in the common coverage area of the BS1 and BS2 sites, The BS1 and BS2 stations are not considered neighbors. However, although the overlapping areas between BS2 and BS3 are relatively small, each of them is not in the coverage area of the other party, but there is a valid terminal in the overlapping coverage area, which constitutes interference to the wireless network of the opposite party, so BS2 and BS3 are called neighboring stations.

In a coexisting base station system, it is often required that the base stations must be synchronized with each other between the base stations, and the transmission and reception signal frame timings between the base stations are strictly aligned, so that the stations with similar geographical locations are not caused to interfere with each other. . For example, in BS1 and BS2 in Fig. 1, if BS2 is transmitting when BS1 is transmitting, the IjBS1 will cause serious interference to the signal that BS2 receives the subordinate terminal.

The basic structure of the coexistence base station is shown in Figure 2. It consists of three parts: the wireless function part, the wired function part, and the coexistence function part (including the coexistence database). The coexistence function part and the other two parts have interfaces, the wired function part is connected to the wired core network or the access network is responsible for the transmission and reception and processing related to the wired communication, and the wireless function part is connected to the air interface for the wireless communication receiving and processing and processing, the wired function Partially connected to the wireless function section.

The base station is divided into a normal working state and a startup initial state. In a coexisting base station system, in a case where a base station is often connected to a core network through a wired path and can be interconnected by wire, a newly activated base station is in a certain normal working state. When initializing near a base station, there are many problems in the interaction of establishing messages with neighboring stations.

Taking the coexistence base station network shown in FIG. 3 as an example, the starting base station SBS1 faces multiple base stations with similar geographical locations: WBS1.

WBS2, WBS3, and WBS4, in Figure 3, there are terminals A and B in the common coverage area of WBS1 and SBS1, and terminals C in the common coverage area of WBS2 and SBS1, and terminal D in the common coverage area of WBS3 and SBS1. . Therefore, WBS1, WBS2, WBS3 and SBS1 are neighbors. The terminal G is in the overlapping portion of the coverage areas of the base stations WBS1 and WBS2. The other terminals E/F/H/I/J/K are not in the overlapping area between the base stations. At this time, SBS1 cannot directly communicate with each WBS on the air interface, and the contact side (such as IP address) of the other party is not known on the wired side. Therefore, SBS1 cannot discover its neighbors and establish contact with neighbors. However, the SBS1 in the air interface will directly interfere with the terminal in the overlapping part of the WBS coverage area with the SBS1. The uncoordinated terminals of the multiple WBSs interfere with each other for the SBS1, so that the SBS1 cannot parse the information carried by the SBS1.

In the above case, a neighboring station discovers and establishes a contact method in the prior art: After the base station is started, the message sent by the neighboring station is detected by the signal of the air interface, and the message is parsed to obtain the information of the neighboring station.

The disadvantages of this method are as follows: Since neighboring stations often cannot directly receive signals from each other's stations, they cannot resolve the information of the neighboring neighbors. For example, in the network of Figure 3, SBS1 cannot directly detect the signal of WBS1.

Another method for discovering and establishing a contact between neighboring stations in the prior art is as follows: After the base station is started, the SBS detects the signal of the terminal of the neighboring station through a simple detection method, and parses the message to obtain the information of the neighboring station.

The disadvantages of this method are as follows: Since there is no guarantee mechanism, the terminals of multiple neighboring stations interfere with each other on SBS1, so that SBS1 can receive the signal, but cannot correctly parse the content in the signal. For example, in Figure 2, A, B, The signals of the four terminals C and D may collide, causing SBS1 to receive the signals sent by each terminal when starting, but cannot parse the information carried in each signal. '

Another method for discovering and establishing a connection between neighboring stations in the prior art is as follows: After the base station SBS1 is started, information such as its latitude and longitude is registered by wire to a coexistence information server (CIS), and the server judges its neighboring station by using information such as latitude and longitude, and Information (IP address, etc.) sent to these neighbors of SBS1.

The disadvantages of this method are as follows: Since the neighboring stations cannot directly judge whether they interfere with each other according to the distance from other stations, the server cannot provide reliable neighbor information to the base station SBS1. In addition, since the coexistence base station system is often not owned by a unified fixed operator, the setup and management of the coexistence information server is also problematic. In addition, the method requires the introduction of devices other than the coexisting base station system, which increases the cost.

Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for a coexisting base station to discover a neighboring station and establish a contact with a neighboring station at the time of initialization, so that the coexisting base station can quickly discover the neighboring station and establish contact with the neighboring station upon startup.

The object of the invention is achieved by the following technical solutions:

The present invention provides a method for coexistence base stations to discover neighboring stations and establish contact with neighboring stations upon initialization, including -

A. setting a downlink coexistence dedicated time-frequency block DCTFS in the downlink frame structure of the coexisting base station;

B. The newly activated base station actively sends a contact request message to the terminal in the overlapping area with the neighboring station by using the DCTFS, and discovers the neighboring station according to the contact information carried by the returned contact message and establishes contact with the neighboring station.

The step A described specifically includes:

One DCTFS is set in the downlink frame of each coexistence base station, or one DCTFS is set only in the downlink frame of the coexistence base station that satisfies the set condition.

The step A described further includes:

In a certain area, the time start point, the duration of the length, the initial frequency and the frequency combination of the DCTFS are fixed and unified under the conditions of each frequency band.

The step B described specifically includes:

Bl, the newly activated base station uses the DCTFS to send a contact request message to the terminal in the overlapping area with the neighboring station, and the terminal will connect The valid information carried in the contact request message or the contact request message received is submitted to the neighboring station to which the terminal belongs;

B2. The neighboring station to which the terminal belongs returns a contact message to the newly activated base station according to the received contact request message or the valid information carried in the message converted by the terminal format, and the newly activated base station receives the contact according to the received contact. The message establishes contact with the neighboring station.

The step B1 specifically includes:

Bll. The newly activated base station uses the DCTFS to send a contact request message including the contact information of the newly activated base station to the terminal in the overlapping area with the neighboring station;

B12. The terminal sends a request for reporting a coexistence message to the neighboring station to which the terminal belongs, and after receiving the report that can be reported by the neighboring station, the terminal submits the received contact request message to the neighboring station. .

The step B12 further includes:

The terminal directly submits the received contact request message to the neighboring station to which it belongs by using the remaining bandwidth originally allocated by the terminal. The step B2 specifically includes:

B21, when the newly activated base station and the neighboring station to which the terminal belongs can communicate with each other through a wired intercommunication, the neighboring station returns a contact message to the newly activated base station by using a wired path;

B22. After receiving the contact message, the newly activated base station initiates communication interaction with the neighboring station, and the two parties establish an effective wired connection.

The step B2 specifically includes:

B23, when the newly activated base station and the neighboring station to which the terminal belongs cannot be interconnected by wire, set an uplink coexistence dedicated time-frequency block UCTFS in the uplink frame structure of the coexisting base station;

B24. The neighboring station to which the terminal belongs selects a coexisting contact terminal, and instructs the coexisting contact terminal to use the UCTFS to send the returned contact message to the newly activated base station on behalf of the network of the neighboring station;

B25. After receiving the contact message, the newly activated base station initiates a communication interaction with the neighboring station, and the newly activated base station and the neighboring station use the DCTFS and the UCTFS to perform information interaction through the contact terminal, and the two parties establish an effective wireless contact. .

The step B23 specifically includes: setting a UCTFS in an uplink frame of each coexistence base station, or setting only one UCTFS in an uplink frame of a coexistence base station that satisfies the set condition.

The step B23 further includes:

In a certain area, the time start point, the duration length, the initial frequency and the frequency combination of the UCTFS are fixed and unified under the conditions of each frequency band.

The step B24 specifically includes:

The contact terminals for a pair of newly activated base stations and neighboring stations may be one or more, and the contact terminals may be temporary or fixed for a period of time.

A method for coexisting a base station to discover a neighboring station and establish contact with a neighboring station at initialization, including:

C. Using the ranging slot Ranging Slot in the protocol or one UCTFS set in the uplink frame of each coexistence base station, let the terminal transmit the interrogation signal to the base station outside the original base station in turn, and the bearer terminal in the interrogation signal The communication information of the original base station; D. The base station that is receiving the initialization state of the signal or the base station that is in the normal working state will obtain the contact information of the original base station of the terminal.

The step C described further includes: In a certain area, the time start point, the duration length, the initial frequency and the frequency combination of the UCTFS are fixed and unified under the conditions of each frequency band.

It can be seen from the technical solution provided by the above invention that the present invention has the following advantages compared with the prior art:

1. The present invention can quickly discover neighboring stations through a simple mechanism for a newly activated base station SBS, and establish a wired or wireless connection with neighboring stations, thereby avoiding hidden problems of neighboring stations;

2. The working base station WBS can also know the situation of the base station being started in time, collect the status information of each terminal in the overlapping interference area, and quickly make the coexistence negotiation and corresponding operation with SBS;

3. The present invention is compatible with the existing 802.16 frame format, and the neighboring station discovery phase does not require a public server, which reduces the requirements for network setup and management. The DCTFS and UCTFS provided by the present invention can also be used to solve some low levels other than initialization. Coexistence of informational information interaction. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of the concept of a neighboring station;

2 is a schematic diagram of a basic structure of a coexistence base station;

3 is a schematic diagram of a network of a coexisting base station according to the illustrated example of the present invention;

4 is a flow chart of a specific process of the method of the present invention;

5 is a schematic diagram of frequency domain description of OFDM or 0FDMA symbols;

6 is a schematic diagram showing the position of a DCTFS in a frame structure according to the present invention;

Figure 7 is a schematic diagram of setting a DCTFS in a multi-physical frame;

FIG. 8 is a schematic diagram showing the timing of sending and receiving of the air interface of the SBS before the SBS is started when only the DCTFS is set;

Figure 9 is a schematic diagram of the specific working process of the SBS during the initialization process;

10 is a schematic diagram of a specific working process of a terminal in an overlapping area between an SBS and a WBS in an SBS initialization process;

Figure 11 is a schematic diagram showing the specific working flow of the WBS in the SBS initialization process;

12 is a schematic diagram of setting a pair of UCTFS and DCTFS in multiple frames;

13 is a schematic diagram of setting UCTFS and DCTFS in different frames in multiple frames;

FIG. 14 is a schematic diagram showing the timing of transmitting and receiving SBS air ports during SBS startup process when only DCTFS is set;

FIG. 15 is a schematic diagram showing the timing of transmitting and receiving SBS air ports during SBS startup process when DCTFS and UCTFS are simultaneously set;

Figure 16 is a schematic diagram of the air interface occupation of the SBS after the SBS is started;

FIG. 17 is a schematic diagram of a coexistence base station network according to an embodiment of the present invention; FIG.

FIG. 18 is a schematic diagram of a network topology structure according to an embodiment of the present invention; FIG.

FIG. 19 is a schematic diagram of an interaction process between SBS1, terminal A, and WBS1 according to an embodiment of the present invention;

20 is a schematic diagram of a coexistence base station network according to another embodiment of the present invention;

FIG. 21 is a schematic diagram of a network topology structure according to another embodiment of the present invention; FIG.

FIG. 22 is a schematic diagram of an interaction process between SBS1, terminal A, and WBS1 in another embodiment of the present invention;

FIG. 23 is a schematic diagram showing the specific implementation structure of the device and system according to the present invention.

Mode for carrying out the invention

The present invention provides a method for coexistence base stations to discover neighboring stations and establish contact with neighboring stations upon initialization.

The core of the present invention is: in the downlink frame structure of the coexistence base station, a downlink coexistence dedicated time-frequency block DCTFS is opened, which is used for interacting with the terminal in the overlapping area of the neighboring station, and obtaining the information according to the interaction of the information. Contact information for neighboring stations. The present invention is described in detail below with reference to the accompanying drawings. The specific processing procedure of the method of the present invention is as shown in FIG. 4, and includes the following steps: Step 4-1: In the downlink frame structure channel of the coexistence base station, a section of downlink coexistence dedicated is opened. Time-frequency block DCTFS.

The present invention firstly needs to use OFDM (Orthogonal Frequency Division Multiplexing) technology in a coexistence base station, and the related coexisting base stations have wired or wireless network interworking, and thus, the coexisting base station constitutes an 0FDM system.

The 0FDM technology belongs to the multi-carrier modulation technique. Its basic idea is to divide the channel into many orthogonal sub-channels, use one sub-carrier for modulation on each sub-channel, and transmit each sub-carrier in parallel. This technology has the ability to transmit signals under clutter interference and is often used in transmission media that are susceptible to external interference or poor resistance to external interference.

A channel of an 0FDM system (e.g., an 802.16 system) includes a number of subchannels (Subchannels), each subchannel consisting of a number of subcarriers. There are three types of subcarriers according to the type of data to be transmitted: data subcarriers: subcarriers for transmitting data; pilot subcarriers: subcarriers for transmitting pilots; null subcarriers: subcarriers not used for transmitting any data, including Guard Band and DC Subcarrier.

The various subcarriers may constitute an OFDM or 0FDMA (Orthogonal Frequency Division Multiple Access) symbol, and the number of subcarriers determines the number of points of the FFT (Fast Fourier Transform) transform. The subcarriers constituting one subchannel may or may not be adjacent. For example, in the frequency domain description diagram of the 0FDM or 0FDMA symbols shown in Figure 5, the subcarriers are adjacent.

In an 0FDM system composed of related coexisting base stations, different uplink FFT spaces are allocated for different users, and each user transmits on one or more subchannels. In the 0FDM system, the subchannel division is an FDMA method, and each subchannel transmits a carrier subset. There are three main methods for dividing the subchannel:

The first method is: dividing the carriers of different subchannels into consecutive groups. This method is the simplest to implement, and the adjacent subchannels are less disturbed, but the obtained frequency diversity is less effective.

The second method is: interleaving the carriers of different subchannels in a regular manner. The frequency diversity obtained by this method is better, but the system is more sensitive to interference between subchannels.

The third method is: interleaving carriers of different subchannels in a pseudo-random manner, and using different sequence change codes by different base stations to reduce interference between base stations.

The present invention needs to define a DCTFS (Coexistence Dedicated Time-Frequency Block) in the downlink (DL) portion of the frame structure of the coexisting radio base station based on the OFDM technology, which is composed of one or more subchannels and one or more OFDM or 0FDMA symbols. The frequency space is formed. Of course, a certain subchannel can also be defined as a DCTFS. The time initial position (T _DOTS _ _start ) at which the time-frequency block is located, the time-frequency block length (consisting of one or more '0FDM or 0FMA symbols' time domains), the initial frequency (F _DOTS _ _stot ), and the frequency combination (ie The frequency domain of one or more subchannels must be easily known and unified by all relevant base stations. The time start point, the duration length, the initial frequency and the frequency combination can be fixed and unified in a certain country region under various frequency conditions, so that the base station can initiate the contact request in an accurate time when starting. The time-frequency block is not occupied by any base station when there is no coexistence message interaction.

For example, DCTFS can be set to a fixed-length time-frequency block at a fixed position after the start of the frame, as shown in Figure 6. The time-frequency block may not need to be set in each frame, and all the frames may be uniformly labeled, and the DCTFS is set only on a regular part of the frame, as shown in FIG. After numbering frames of all base stations, DCTFS is set on each frame whose frame number can be divisible by N.

The DCTFS is used to send an initialization message to the SBS. Therefore, before the SBS is started, the time-frequency block is idle and is not occupied by the base station. At this time, the timing diagram of the air interface transmission and reception of the SBS is as shown in FIG. 8.

Step 4-2. The newly activated base station (SBS) uses the DCTFS to issue a contact request to the terminal in the overlapping area with the neighboring station (WBS). In this method, the specific working process of the SBS (newly activated base station) in the initialization process is as shown in FIG. 9, and the specific description is as follows: After the SBS (newly activated base station) is powered on, the initialization of the wired part is completed first. For example, obtain an IP address, etc. Then select the target channel. Detecting whether there is interference on the target channel. If there is no interference, it indicates that there is no interference between the base station and the neighboring station in the overlapping area, and the independent default configuration initialization procedure is started. If there is interference, the base station and the base station are There is a valid terminal in the overlapping area of the neighboring station, so the timing frequency information of the coexistence dedicated time-frequency block DCTFS is obtained by the full-time timing frequency information. And transmitting, in the DCTFS, the contact request message to the neighboring base station to the active terminal, where the message contains information required by the neighboring station to contact the SBS.

In the process described above, the process of detecting the target channel is optional (the effective terminal is likely to have limited the transmission power when the SBS is started due to the communication requirement, which may cause the SBS to interfere with the terminal's signal reception but the SBS detection. Not the terminal's transmit signal, which is one of the reasons for detecting the target channel process).

Step 4-3: The terminal in the overlapping area between the SBS and the WBS submits the received contact request message to the WBS to which the terminal belongs. In this method, the specific working process of the terminal in the overlapping area between the SBS and the WBS in the SBS initialization process is as shown in FIG. 10, and the specific description is as follows:

The terminal in the overlapping area between the SBS and the WBS listens to the signal on the DCTFS time-frequency block while receiving the normal data transmission and reception, and upon receiving the contact request of the base station (SBS), reports the received signal to the original base station (WBS). Message. .

The terminal may directly send the original bandwidth allocated to the original base station (WBS), or may send a request to report the coexistence message first, and then wait for the WBS indication, if the WBS indication is received. If the terminal can report the request, it reports the valid information in all the contact request messages received.

Since the uplink bandwidth is allocated on demand, the terminal does not necessarily have sufficient uplink bandwidth. In principle, the user of the terminal needs to pay for a larger amount of traffic, and the traffic is used for the base station, so The application and reporting methods are more reasonable. In this way, the base station can allocate a free reporting bandwidth for the terminal that needs to be reported.

Step 4 4. The WBS sends a contact message to the SBS using the wired network or the contact terminal according to the received contact request.

In this method, the specific working process of the WBS in the SBS initialization process is as shown in FIG. 11, and the specific description is as follows:

If the coexisting base station WBS that is working is receiving the request for reporting the coexistence message, the terminal allocates the uplink bandwidth to the reporting terminal according to all the reporting requests received in a certain period of time, and then indicates the The terminal reports the contact request message obtained by the terminal, and the contact request message contains the necessary information of the wired contact SBS. Of course, the WBS can also receive the message that the terminal directly reports the remaining bandwidth without requesting.

After receiving the contact request information, the WBS can initiate a contact message to the SBS through the cable between the coexistence stations. When the WBS is an independent network or the WBS cannot interact with the SBS through the wired core network, the WBS may also designate a contact terminal, and then initiate a contact message to the SBS through the contact terminal.

In this case, it is necessary to define a UCTFS (uplink coexistence dedicated time-frequency block) in the UL (upstream) part of the original frame format of the coexisting base station, which is composed of one or more subchannels and one or more OFDM or 0FDMA symbols. The composition of the time-frequency space. When a subchannel can also be defined as UCTFS. The initial location of the time and the time slice length (ie, the time domain of one or more OFDM or OFDM symbols), the initial frequency and frequency combination (ie, the frequency domain configuration of one or more subchannels) must be easily associated with all base stations. Obtained and unified. UCTFS and DCTFS time-frequency blocks can be set in each frame. All frames can be uniformly labeled, and DCTFS and UCTFS can be determined only on a regular part of the frame. DCTFS can also be configured on some frames. With UCTFS, for example, after numbering frames for all base stations, a DCTFS and UCTFS are given for every N frames (N is a natural number), such as frames that are divisible by frame number N (0, N, 2N,

3N-..); For example, DCTFS is given on a frame that can be divisible by N, and UCTFS is given on a frame divided by N by 1. A schematic diagram of setting a pair of UCTFS and DCTFS in a multi-frame is shown in FIG. 12, and a schematic diagram of setting UCTFS and DCTFS in different frames in a multi-frame is shown in FIG.

Then, after the terminal reports the contact request message to the WBS, the BS can designate it as the CLSS (Coexistence Contact Terminal) with the SBS. At this time, the base station WBS sends a contact indication, instructing the CLSS to use the UCTFS to send the specific coexistence to the SBS. Sexual negotiation signaling. After receiving the indication, the terminal buffers other signaling that needs to be sent, and uses the UCTFS to send a corresponding contact message to the SBS as required.

If the terminal is not designated as CLSS, the terminal will continue to monitor the signal on the DCTFS time-frequency block. The CLSS is selected by the WBS and can be temporary. For example, each message specifies a CLSS, or it can be fixed for a period of time. It can specify a CLSS for a pair of WBS and SBS connections, or multiple CLSSs at the same time.

The message sent to the WBS and sent by the SBS as described above can adopt the ARQ mechanism (Automatic Retransmission Request).

In the SBS startup process described above, when only the DCTFS is set, the timing diagram of the air interface transmission and reception of the SBS is as shown in FIG. 14. In the SBS startup process described above, when DCTFS and UCTFS are set at the same time, the timing diagram of the air interface transmission and reception of the SBS is as shown in FIG. 15.

Step 4-5: After receiving the WBS contact message, the SBS and the WBS complete mutual coexistence configuration, and the two parties establish effective contact communication. .

After using the DCTFS to send a contact request to the terminal in the overlapping area with the WBS, the SBS waits for the contact message returned by the WBS (possibly multiple).

If the SBS receives the contact information sent by the neighboring WBS through the wired mode within the specified time, the communication interaction with the neighboring station is initiated, and the two parties establish an effective wired connection to complete the coexistence negotiation and configuration of the local station and the neighboring station. And carry on the subsequent communication interaction, after the SBS completes the initialization, it starts to work normally and becomes the WBS.

If the SBS receives the contact information sent by the CLSS through the UCTFS within the specified time, the communication interaction with the neighboring station (the base station to which the CLSS belongs) is initiated, and the coexistence negotiation and configuration of the local station and the neighboring station are completed by using the DCTFS and the UCTFS. And the subsequent communication interaction, the SBS starts the normal work of the base station after the initialization is completed, and becomes the WBS.

If the SBS does not receive the contact information within the specified time, the DCTFS contact request can be resent. After repeating the above process several times and still not obtaining the neighbor message, the default configuration initialization scheme is started, and the SBS starts the normal operation of the base station after the initialization is completed, and becomes the WBS.

After the SBS is started, the DCTFS and UCTFS will be idle again. The air interface occupation of the SBS is shown in Figure 16.

The present invention further provides an embodiment of the method according to the present invention. The coexistence base station network shown in FIG. 17 is taken as an example, and the network topology structure is as shown in FIG. 18.

Each base station is connected by a wired network. Each base station has its own terminal connected below it. A/B/E/G terminal is connected under WBS1, a C/F terminal is connected under WBS2, and D/H is hung under WBS3. terminal. (The terminal connected to SBS1 cannot be initialized before SBS1 works normally.) The corresponding terminal in the coverage area of SBS1 has A/B/C/D, and G is in the coverage of WBS2 at the same time. However, before completing the coexistence contact, SBS1 could not know the wired contact information of the neighboring station, such as the IP address.

In the startup process of SBS1, according to the method of the present invention, the interaction process between SBS1, terminal A and WBS1 is as shown in FIG. The specific process is as follows:

1. SBS1 starts and completes the wired part initialization, obtains the information for wired connection with the neighboring station, such as the IP address of the station, selects the wireless channel, and then uses DCTFS to send the contact to all the terminals (including terminal A) reachable by the air interface. Request message, the contact request The message includes information such as the IP address of SBS 1;

2. The terminal A intercepts the contact request message, and sends the coexistence message request to the original base station WBS1 after receiving the contact request message, and the qualified terminal that receives the contact request message on the DCTFS sends a coexistence message to the TOS 1 to which the terminal belongs. Reporting request;

3. After the WBS1 learns the report request, it allocates the bandwidth for reporting the coexistence message to the designated terminal and specifies that it performs coexistence message reporting. For example, if both terminals A and B apply for coexistence message reporting, WBS1 can specify that A reports it. The coexistence message can also report all the terminals that apply for reporting in order;

4. After receiving the report indication, the terminal A reports the obtained contact request message sent by the SBS1 to the WBS1;

5. After receiving the contact request message reported by the terminal A, the WBS1 sends a contact message to the SBS1 through the wired network according to the obtained wired contact information (such as an IP address, etc.);

6. SBS1 knows the contact method with the neighboring station WBS1 from the message, and then sends a contact message to the WBS1 through the wired network. After the WBS1 receives the contact message of the SBS1 again from the cable, the SBS1 and the WBS1 are established. Wired contact. The two parties can then begin various information interactions, including coexistence negotiations.

Take the coexistence base station network shown in Figure 20 as an example. The network topology is shown in Figure 21.

The base stations WBS2 and WBS3 are connected by wired network, and SBS1 and WBS1 cannot communicate with each other on the wired network. Before the wireless side interface completes the coexistence contact, SBS1 cannot know the specific contact mode of the neighboring station. Each base station has its own terminal connected below, and the A/B/E/G terminal is hung under WBS1, the C/F terminal is hung under WBS2, and the D/H terminal is hung under WBS3. (The terminal connected to SBS1 cannot be initialized before SBS1 works normally.) The corresponding terminal in the coverage area of SBS1 has A/B/C/D, and G is in the coverage of WBS2 at the same time.

During the startup process of SBS1, the interaction process between SBS1, terminal A and WBS1 is as shown in Fig. 22 according to the method of the present invention. The specific process is as follows:

1. SBS1 starts and completes the cable and some parts of its initialization, obtains some necessary information for connecting with the neighboring station, such as the site ID of the station, selects the wireless channel, and then uses DCTFS to reach all the terminals that are reachable to the air interface (including The terminal A) sends a contact request message, where the contact request message includes information such as the ID of the SBS1;

2. The terminal A intercepts the contact request message, and sends the coexistence message report request to the original base station WBS1 after receiving the contact request message, and the qualified terminal that receives the contact request message on the DCTFS sends a coexistence message report request to the WBS1 to which the terminal belongs. ;

5. The WBS selects one or more reporting terminals as coexistence contact terminals (CLSS) according to the received information, and instructs it to forward the signaling of the coexistence contact by UCTFS through a normal downlink channel.

6. After receiving the contact message sent by the WBS, the CLSS sends the contact message to the SBS by using UCTFS;

7. The SBS learns the contact message of the neighboring WBS from the contact message forwarded by the CLSS, and then sends a coexistence message to the CLSS by using the DCTFS;

8. The CLSS will report the coexistence message received by the SBS and send it to the WBS. Since then, effective wireless communication has been established between SBS and WBS. The two parties can then begin information interactions including coexistence negotiations.

The present invention also provides an alternative to the present invention: using a Ranging Slot in an existing protocol or a UCTFS according to the present invention to cause a terminal to transmit an interrogation signal to a base station outside the original base station in turn. Bearer terminal in the signal or mechanism Contact information of the original base station, such as an IP address. The base station SBS or WBS receiving the signal will obtain the contact information of the original base station of the terminal. However, this solution increases the burden of the Ranging Slot ranging slot, and requires uniform coordination of the Ranging slot ranging slots between the stations.

The present invention also provides a device for discovering a neighboring station and establishing a contact with a neighboring station at the time of initialization, and the specific implementation structure is as shown in FIG. 23, the device is disposed in the base station, and includes - (1) a contact message. Text sending unit

The unit is configured to send a contact request message by using a DCTFS set in a downlink frame structure in the newly activated base station, and the contact message sending unit may specifically include:

a contact request message sending processing unit, configured to send, by the DCTFS, a contact request message to a terminal in an overlapping area with the neighboring station in the newly activated base station, and send the contact request message or contact through the terminal The valid information carried in the request packet is submitted to the neighboring station to which the terminal belongs;

The contact message receiving unit is configured to receive a contact request message received by the neighboring station to which the terminal belongs or a contact message returned after the valid information carried in the message formatted by the terminal format, that is, the contact request message received back The response message of the text is submitted to the establishment of the contact processing unit.

(2) Establish a contact processing unit

The unit is configured to discover the neighboring station and establish contact with the neighboring station according to the contact information carried by the returned contact message.

In the device of the present invention, if the newly activated base station and the neighboring station to which the terminal belongs can be interconnected by wire, the newly activated base station receives the contact report returned by the neighboring station through the wired path. Text. If the newly activated base station and the neighboring station to which the terminal belongs cannot communicate with each other through the wired connection, the neighboring station to which the terminal belongs selects the coexisting contact terminal, and instructs the coexisting contact terminal to use the UCTFS to represent the neighbor. The station's network sends the returned contact message to the newly activated base station.

The present invention also provides a system for discovering a neighboring station and establishing a contact with a neighboring station at the time of initialization, and the specific implementation structure is still as shown in FIG. 23, including a contact message sending unit and establishing a contact set in the base station. a processing unit, and a contact message relay processing unit disposed in the terminal, and a contact message response unit disposed in the neighboring base station, where:

The liaison message transfer processing unit is configured to submit, in the terminal, the valid information carried in the received contact request message or the contact request message to the neighboring station to which the terminal belongs, and the message is processed in transit The specific processing manner of the unit includes: the terminal sending a request for reporting a coexistence message to the neighboring station to which the terminal belongs, and submitting the received contact request message after receiving the report that can be reported by the neighboring station to which the terminal belongs To the adjacent station;

Or,

The terminal directly submits the received contact request message to the neighboring station to which it belongs by using the remaining bandwidth originally allocated by the terminal. The liaison message response unit is configured to return a liaison message to the newly activated base station according to the received contact request message or the valid information carried by the terminal format converted message in the neighboring station to which the terminal belongs. Text.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Rights request

A method for coexisting a base station to discover a neighboring station and establish a contact with a neighboring station at the time of initialization, characterized in that it comprises -

A, setting a downlink coexistence dedicated time-frequency block DCTFS in a downlink frame structure of the coexistence base station;

The method of claim 1, wherein the step A includes: - setting one in a downlink frame of each coexistence base station. DCTFS, or only one DCTFS is set in the downlink frame of the coexistence base station that satisfies the set condition. '

The method of claim 2, wherein the coexistence base station finds a neighboring station and establishes a contact with the neighboring station according to claim 2, wherein the step A further includes:

In a certain area, the time start point, the duration length, the initial frequency and the frequency combination of the DCTFS are fixed and unified under the conditions of each frequency band.

The method for establishing a neighboring station and establishing a connection with a neighboring station by the coexistence base station according to claim 1, 2 or 3, wherein the step B specifically includes -

Bl, the newly activated base station uses the DCTFS to send a contact request message to the terminal in the overlapping area with the neighboring station, and the terminal submits the valid information carried in the received contact request message or the contact request message to the terminal. Neighboring station

The method of claim 4, wherein the step B1 comprises:

Bl l, the newly activated base station uses the DCTFS to send a contact request message including the contact information of the newly activated base station to the terminal in the overlapping area with the neighboring station;

B12. The terminal sends a request for reporting a coexistence message to the neighboring station to which the terminal belongs, and after receiving the reportable report sent by the neighboring station, the terminal submits the received contact request message to the neighboring station. .

The method of claim 5, wherein the step B12 further comprises:

The terminal directly submits the received contact request message to the neighboring station to which it belongs by using the remaining bandwidth originally allocated by the terminal.

The method of claim 4, wherein the step B2 comprises:

B21. When the newly activated base station and the neighboring station to which the terminal belongs can communicate with each other through a wire, the neighboring station passes Returning the contact message to the newly activated base station via the wired path;

B22. After receiving the contact message, the newly activated base station initiates a communication interaction with the neighboring station, and the two parties establish an effective wired connection.

The method of claim 4, wherein the step B2 comprises:

B23, when the newly activated base station and the neighboring station to which the terminal belongs cannot be interconnected by wire, set an uplink coexistence dedicated time-frequency block UCTFS in the uplink frame structure of the coexistence base station;

The method of claim 8, wherein the step B23 comprises:

A UCTFS is set in the uplink frame of each coexistence base station, or only one UCTFS is set in the uplink frame of the coexistence base station that satisfies the set condition.

The method of claim 9, wherein the step B23 further comprises:

In a certain area, the time start point, the duration length, the initial frequency and the frequency combination of the UCTFS are fixed and unified under the conditions of each frequency band. '

The method for discovering a neighboring station and establishing a connection with a neighboring station by the coexistence base station according to claim 8, wherein the step B24 specifically includes: - contacting a pair of newly activated base stations and neighboring stations The terminal is one or more, and the contact terminal is temporary or fixed for a period of time.

12. A method for coexisting a base station to discover a neighboring station and establish a contact with a neighboring station at the time of initialization, and the method includes:

C. Using the ranging slot Ranging Slot in the protocol or one UCTFS set in the uplink frame of each coexistence base station, let the terminal transmit the interrogation signal to the base station outside the original base station in turn, and the bearer terminal in the interrogation signal Contact information of the original base station;

D. The base station in the initial state in which the signal is received or the base station in the normal working state will obtain the contact information of the original base station of the terminal.

The method of claim 12, wherein the coexistence base station finds a neighboring station and establishes a contact with the neighboring station according to claim 12, wherein the step C further comprises:

14. A device for coexisting a base station to discover a neighboring station and establishing a connection with a neighboring station at the time of initialization, wherein the device is disposed in the base station, and includes:

a contact message sending unit, configured to send, by using a DCTFS set in a downlink frame structure, a contact request message in the newly activated base station;

A contact processing unit is established for discovering the neighboring station and establishing contact with the neighboring station based on the contact information carried by the returned contact message.

The device for discovering a neighboring station and establishing a connection with a neighboring station by the coexistence base station according to claim 14, wherein the liaison message sending unit comprises:

a contact request message sending and processing unit, configured to send, by the DCTFS, a contact request message to a terminal in an overlapping area with the neighboring station in the newly activated base station, and send the contact request message or contact through the terminal The valid information carried in the request packet is submitted to the neighboring station to which the terminal belongs;

The contact message receiving unit is configured to receive a contact request message received by the neighboring station to which the terminal belongs or a contact message returned after the valid information carried by the referee after the terminal format conversion, and submit the contact message to the establishing contact processing unit .

16. The apparatus for discovering a neighboring station and establishing a communication with a neighboring station by the coexistence base station according to claim 14 or 15, wherein if the newly activated base station and the neighboring station to which the terminal belongs The wired intercommunication can be performed, and the newly activated base station receives the contact message returned by the neighboring station through the wired path.

17. The apparatus for discovering a neighboring station and establishing a communication with a neighboring station at the time of initialization according to claim 14 or 15, wherein if said newly activated base station and said neighboring station to which said terminal belongs If the wired interworking is not possible, the neighboring station to which the terminal belongs selects the coexisting contact terminal, and instructs the coexisting contact terminal to use the UCTFS to send the returned contact message to the newly activated base station on behalf of the network of the neighboring station.

18. A system for coexisting a base station to discover a neighboring station and establishing a contact with a neighboring station at the time of initialization, comprising: a contact message sending unit and a contact establishing processing unit disposed in the base station, and a contact set in the terminal a message transfer processing unit, and a contact message response unit disposed in the neighboring base station, where:

The contact message transfer processing unit is configured to submit, in the terminal, the valid information carried by the received contact request message or the contact request message to the neighboring station to which the terminal belongs;

The contact message response unit is configured to return a contact message to the newly activated base station according to the received contact request message or the valid information carried by the terminal format converted message in the neighboring station to which the terminal belongs.

The system for discovering a neighboring station and establishing a connection with a neighboring station at the time of initialization according to claim 18, wherein the message transfer processing unit comprises:

The terminal sends a request for reporting a coexistence message to the neighboring station to which the terminal belongs, and after receiving the report that can be reported by the neighboring station, the terminal submits the received contact request message to the neighboring station;

Or,