WO2006007792A1

WO2006007792A1 - Trunked traffic frame distributing method and base station controller for distributing traffic frame

Info

Publication number: WO2006007792A1
Application number: PCT/CN2005/001084
Authority: WO
Inventors: Xiong Luo; Jun Zhang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2004-07-20
Filing date: 2005-07-20
Publication date: 2006-01-26
Also published as: RU2345504C2; CN100384266C; CN1725880A; RU2007105774A

Abstract

A trunked traffic frame distributing method includes the following steps: When establishing trunked call, the BSS assigns the same selection distribution unit for establishing forward traffic channel to MSs in the same trunked group in the same cell; When the BSS is distributing the traffic frame, it sends the traffic frame to every SDU that has established the forward traffic channel for every MS in the same trunked group, and then every SDU distributes the traffic frame to every forward traffic channel that has been established. A system for said method is also provided. According to the method and system, the traffic frames that are distributed on the forward traffic channel for every MS in the same trunked group in the same cell are aligned, and a lot of SDU processing resource is saved.

Description

Cluster service frame distribution method and base station controller for realizing service frame distribution

The present invention relates to a service frame distribution technique, and more particularly to a cluster service frame distribution method and a base station controller (BSC) for implementing service frame distribution. Background of the invention

At present, when implementing digital trunking services in CDMA, CDMA2000 or CDMA IX systems, in order to save base station power, a method of sharing a forward traffic channel is generally adopted, and the base station transmits a service frame through a forward shared traffic channel, and multiple users (MS Simultaneously listening to the forward shared traffic channel to obtain the service frame. One implementation of the forward shared traffic channel is: For the same group under the same cell, the base station jointly transmits a forward traffic channel (F-TCH) through multiple channel units (CEs), and all transmitted F-TCHs have the same The Walsh (WALSH) code and the long code, the MS combines and decodes the received F-TCH, and the received power is equal to the sum of all F-TCH transmit powers of the same WALSH code and the long code of the cell, so that the slave logic The purpose of sharing F-TCH is reached. The F-TCH described herein merely represents the forward traffic channel established for the MS and is not limited to a particular channel type.

When the F-TCH is established, different MSs establish F-TCHs in different selective distribution units (SDUs). Therefore, in the downlink service frame transmission process, different MSs in the same group in the same cell send service frames by different SDUs. . FIG. 1 is a schematic diagram of a processing method for an existing cluster system to establish an F-TCH for the same cluster group MS. In the existing cluster system, the cluster server (PTT Server) serves as the control center of the cluster service, and is mainly responsible for call control and media stream distribution of the cluster service. When a cluster call is initiated to a cluster group MS, each MS will call. The setup request is sent to the respective base station system (BSS) to which the call is established, the call setup request It can be an origin call request, a page response, or a join group call request. As shown in FIG. 1 , the same cluster group MS currently performing the call includes: MS1, MS2, MS3, MS4, and MS5, where MS1, MS2, and MS3 belong to BSS1, and MS4 and MS5 belong to BSS2, when the cluster is When the group MS initiates a call, the PTT Server sends a call setup request to BSS1 and BSS2, respectively, and BSS1 and BSS2 respectively establish an F-TCH for each MS according to the MS information in each call setup request. Since different MSs establish F-TCHs in different SDUs, BSS1 allocates SDUus for MS1 to establish F-TCH11, SDUs ₁₂ for MS2 to establish F-TCH12, and SDUs ₁₃ for MS3 to establish F-TCH13; BSS2 is The MS4 allocates the SDU ₂₁ to establish the F-TCH ₂₁ and the SDU ₂₂ to the MS 5 to establish the F-TCH ₂₂ .

However, for the MS, if the F-TCHs of all the MSs in the same group in the same cell are successfully combined and decoded, the service frames sent on each F-TCH must be aligned. Otherwise, the MS may be interfered with the MS. Receive service frames correctly. It can be seen from the process of establishing an F-TCH for the MS as shown in FIG. 1. If MS1, MS2, and MS3 are the same cell MS, and their F-TCHs are respectively established on different SDUs, thus, it is necessary to combine the decoded F-s. The TCH is established in different SDUs. It is difficult to ensure that the service frames sent on each F-TCH can be aligned when they arrive at the MS, so that the service frames cannot be transmitted correctly. Here, the so-called service frame alignment means that the frame numbers of the service frames sent from the respective F-TCHs are the same, and the time interval at which each service frame arrives at the MS is within a predetermined delay range.

In addition, for a digital trunking system, it is usually necessary to establish an F-TCH for a large number of MSs in multiple cells to transmit a service frame, which wastes a large amount of SDU processing resources of the system, which is not conducive to the implementation of the digital trunking system. Summary of the invention

In view of this, the main purpose of the present invention is to provide a cluster service frame distribution method and a BSC for realizing service frame distribution, which can effectively use the SDIJ resource to establish a forward service letter. And distribute cluster service frames.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

The present invention provides a cluster service frame distribution method, and the method includes:

When establishing a trunking call, the base station system (BSS) allocates the same selective distribution unit (SDU) to each MS of the same cluster group in the same cell to establish a forward traffic channel;

When distributing the service frame, the BSS sends the service frame to each SDU of the forward traffic channel for each MS of the same cluster group, and then each SDU distributes the service frame to each of the respective forward traffic channels established.

The method for determining the cluster call is as follows: The BSS determines whether the current call is a trunk call according to the service option SO or the message type in the current call setup request.

The process of allocating the SDU to establish the forward traffic channel specifically includes: all. The BSS determines whether the SDU has been allocated to the cluster group of the call, and if yes, performs step al3; otherwise, performs step al2;

Al2. The BSS allocates a new SDU to establish a forward traffic channel for the MS of the call, and ends the process of establishing the forward traffic channel;

Al3. The BSS determines the SDU that has been assigned to the call cluster group and establishes a forward traffic channel for the MS of the call on the SDU.

In the step a3, the method for determining, by the BSS, the SDU that has been allocated to the current call cluster group is as follows: The BSS queries the cluster group state information saved by the BSR according to the group identification information in the current call setup request, and determines the cluster as the cluster. Group of assigned SDUs.

The process of allocating the SDU to establish the forward traffic channel specifically includes: a21. The BSS determines whether the SDU has been allocated to the cluster group of the call, and if yes, step a22; otherwise, step a23;

A22. The BSS determines whether there is an SDU that can establish a forward traffic channel for each MS that is allocated to the current call cluster group. If yes, the current call can be the current call. The MS that establishes the forward traffic channel of the MS establishes the SDU to establish a forward traffic channel for the MS of the call, and ends the process of establishing the forward traffic channel; otherwise, step a23 is performed.

A23. The BSS allocates a new SDU to establish a forward traffic channel for the MS of the call. The SDU is configured to determine whether the cluster group of the call has been assigned the SDU according to the group identifier in the current call setup request.

In the step a22, the determining is: the BSS queries the cluster group status information according to the group identifier in the current call setup request, determines the SDU that has been allocated to the cluster group, and then determines according to the information of the allocated SDU.

In step a22, the selecting the SDU is: arbitrarily selecting one SDU from all SDUs that can establish a forward traffic channel for the MS that can be the current call, or establishing a forward direction for all MSs capable of the current call according to a predetermined selection criterion. The SDU of the traffic channel is selected.

The assigning an SDU to establish a forward traffic channel is: a forward traffic channel established for an MS of the same set group in the same cell has the same Walsh (WALSH) code and a long code.

The BSS distributes the service frame to the SDU as follows: The BSS distributes the service frame to each SDU according to the total number of SDUs allocated by the cluster group of the call.

The SDU distribution service frame: each SDU distributes the service frame to each forward traffic channel according to the total number of forward traffic channels established by each SDU.

The present invention also provides a base station controller (BSC) for implementing service frame distribution, the BSC comprising: a control unit (CC) and an SDU; when establishing a trunk call, the CC receives a trunk call setup request, and the SDU is based on The received channel establishment indication is used to establish a forward traffic channel for the MS. When the service frame is distributed, the SDUs of the forward traffic channel are set up for the current cluster group MS to receive the service frames and are distributed to the respective forward traffic channels established by the respective clusters. The feature is that the BSC further includes:

The SDU allocation module receives the cluster call setup request from the CC, and queries the cluster through the CC. Group status information, select the same selection distribution unit for each MS of the same cluster group in the same cell

SDU, and sends a channel establishment indication to the selected SDU.

The SDU allocation module is an entity that is independently set; or is integrated in the CC. It can be seen from the foregoing solution that the key to the present invention is that each MS of the same cluster group in the same cell establishes a forward traffic channel in the same SDU, and each forward traffic channel established by each SDU that establishes the forward traffic channel in itself. Distribute service frames on.

Therefore, the cluster service frame distribution method provided by the present invention and the implementation of service frame distribution

The BSC can save SDU processing resources when establishing a cluster call and distribute the cluster service frame, and ensure that the service frames sent on the forward traffic channel of the same cluster group MS in the same cell can be aligned, so that the MS can correctly correct the service frame. Merge, decode. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a processing method for an existing cluster system to establish an F-TCH for the same cluster group MS;

2 is a schematic diagram of a BSS distribution service frame processing flow in the method of the present invention;

FIG. 3 is a schematic structural diagram of a BSC for implementing service frame distribution according to the present invention; FIG.

4 is a schematic diagram of a process flow for a BSS to establish an F-TCH for an MS in a method according to the present invention;

FIG. 5 is a schematic diagram showing an implementation principle of a cluster system for establishing an F-TCH for the same cluster group MS in the method of the present invention. Mode for carrying out the invention

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

In the method of the present invention, the same SDU is built for each MS of the same cluster group in the same cell. Establish F-TCH and distribute service frames. The processing of the method of the present invention will be described in detail below by taking a CDMA system as an example.

When a cluster call is established, the MSs of the same cluster group in the same cell establish an F-TCH in the same SDU. Based on the call setup method, the service plane of the service plane data is distributed by the SDU.

2 is a schematic diagram of a BSS distribution service frame processing flow in the method of the present invention, and the specific processing steps are as follows:

Step 201: The BSS receives the service frame sent from the PTT Server.

Step 202: The BSS allocates a service frame to each SDU of the F-TCH to the cluster group of the call.

The SDU allocates an SDU to the MS. The total number of SDUs added to the current SDU is increased by one, and finally the total number of SDUs allocated for the cluster group is obtained. Therefore, in this step, the BSS can distribute the service frames to the respective SDUs according to the total number of SDUs.

Step 203: Each SDU in step 202 separately distributes the received service frame to each F-TCH that is established.

Here, in the call setup process of a cluster group, when the SDU establishes an F-TCH for the MS, the number of F-TCHs is counted by the SDU, for example: The total number of F-TCHs set in advance is 0, and each is an MS. When the F-TCH is established, the total number of current F-TCHs is increased by 1, so that the total number of F-TCHs established by itself is finally obtained. Therefore, in this step, the SDU can distribute the service frame to each F-TCH according to the total number of F-TCHs.

Step 204: Each MS combines and decodes the F-TCHs of the same cluster group in the same cell, and finally receives the service frame.

In the method of the present invention, for a cluster group, it is in the same cell on the SDU. The F-TCH established by the MS has the same WALSH code and long code, so that the F-TCH of the same cluster group MS in the same cell necessarily has the same WALSH code and long code, so each MS can merge these F-TCHs. decoding.

In the call setup process, the F-TCH of the same cluster group MS in the same cell is established in the same SDU. In addition, for the existing soft handover, the system establishes a soft handover for the MS in the same SDU. Channel branching, and distributing the service frame to a soft handover channel branch according to the Frame Processing (FP) protocol of the CDMA system, and the frame number and delay adjustment of the service frame distributed in each channel branch according to the FP protocol can ensure frame alignment. Therefore, the MS performing the soft handover can perform the combined decoding on each channel branch. Therefore, the method of the present invention can use the processing specified by the FP protocol when the service frame is distributed by the same SDU, so as to ensure that the service frames distributed in each F-TCH can be aligned. Enables the MS to correctly combine and decode each F-TCH of the same cluster group in the same cell.

The key to the method for distributing the service frame shown in FIG. 2 is that, in the call setup process, the BSS establishes the F-TCHs of the same cluster group MS in the same cell in the same SDU, and the call setup process of the method of the present invention is as follows. The processing in the details is explained in detail.

The BSS is composed of a BSC and a number of base transceiver stations (BTSs) controlled by the BSC. The BSC can establish a forward traffic channel for each MS through the BTS, and the BSC is composed of a control unit (CC) and a number of SDUs controlled by the BSC. In the existing BSC, when establishing a trunk call, the CC receives a trunk call setup request from the MS and allocates an SDU for the current call, and then sends a channel establishment indication to the allocated SDU, before the SDU is established for the MS corresponding to the indication. To the traffic channel; when the service frame is distributed, each SDU allocated for the cluster group receives the service frame and distributes to each of the respective forward traffic channels established. In order to achieve the purpose of the present invention, an SDU allocation module needs to be added to the BSC, and the SDU allocation module receives a cluster call setup request of each MS from the CC, queries the cluster group status information through the CC, and selects an SDU according to the queried cluster group status information. And transmitting a channel establishment indication to the selected SDU to establish a forward traffic channel. Here, the principle that the SDU allocation module selects the SDU is: selecting the same SDU for each MS of the same cluster group in the same cell, the SDU allocation module may be integrated in the CC, or may be an entity independently set in the BSC, and the SDU The distribution module can be implemented in software or hardware.

FIG. 3 is a schematic structural diagram of a BSC for implementing service frame distribution according to the present invention. In this embodiment, the SDU allocation module is integrated in the CC. As shown in FIG. 3, the BSS includes: a BSC and each BTS controlled by the BSC, where the BSC includes: a CC integrated with an SDU allocation module, and SDU1, SDU2, and SDU3 controlled by the CC.

In Figure 3, six MSs in a total of three cluster groups send cluster call setup requests to the CC. The SDU allocation module selects SDU1 for MS1 and MS2 of cluster group 1 and sends a channel establishment indication to SDU1 twice. The SDU allocation module selects SDU2 for MS3, MS4, and MS5 of cluster group 2 and sends three channel establishment indications to SDU2, SDU. The allocation module selects SDU3 for MS6 of cluster group 3 and sends a channel establishment indication to SDU3. In this way, SDU1 can establish a forward traffic channel for MS1 and MS2, SDU2 can establish a forward traffic channel for MS3, MS4 and MS5, and SDU3 can establish a forward traffic channel for MS6. The SDU establishes a forward traffic channel for the MS through the BTS. Since the processing of the BTS is not a problem related to the present invention, it will not be described in detail herein. Based on the above-described composition of the BSC of the present invention, the processing flow of the method of the present invention is as follows.

4 is a schematic diagram of a process flow for a BSS to establish an F-TCH for an MS in the method of the present invention. As shown in Figure 4, the specific processing steps are as follows:

Step 401: The CC receives the call setup request. Here, the call setup request may be an origin call request, a paging response, or a join group call request, etc., and the BSS receives a call setup request from the MS side.

Step 402: The CC determines, according to the call setup request, whether the current call is a trunk call, if yes, step 403 is performed; otherwise, the current process is ended. The cc may determine whether the current call is a trunked call according to the service option (so) in the call setup request or according to the message type of the call setup request. Here, other fields indicating the message type may be added to the call setup request, and the BSS may also judge according to the added field indicating the message type.

Step 403: The CC sends a call setup request to the SDU allocation module, and the SDU allocation module reads the group identification information in the call setup request, and queries the cluster group status information saved by the BSC according to the group identification information, and determines Whether the SDU has been assigned to the cluster group where the call MS is located, and if yes, go to step 404; otherwise, go to step 405. The MS of the current call in this paper refers to the calling MS for the initial call request, and refers to the MS requesting to join the group call for the paging response or joining the group call request.

In a cluster system, cluster components are of two types: permanent group and temporary group; the so-called permanent group is a fixed cluster group in which the system is divided into MSs in advance, and the system will permanently save such cluster group information; the so-called temporary group is MS. A cluster group that is temporarily composed. When the call of this cluster group ends, the system will release the cluster group information.

Here, the group identifier is a fixed group ID for the permanent group, a temporary dynamically assigned group ID for the temporary group, or the calling MS number or the device identifier in the current call request. No., such as: Mobile Station Number (MDN), International Mobile Subscriber Identity (IMSI) or Electronic Serial Number (ESN). The CC can query the corresponding cluster group status information according to the group ID, or obtain the index value by using the hash (HASH) algorithm according to the calling MS number or the device identification number to find the corresponding cluster group status information.

The cluster group status information includes: an activation status, an MS connection status, and the like, and, for the activated cluster group, the cluster group status information further includes: the accessed MSs are located The ID of the cell and the information of the assigned SDU. Therefore, the BSS can determine whether the SDU is allocated to the cluster group where the MS of the call is located according to the MS connection situation or the activation condition, if no MS establishes a call connection or a cluster group. If it is not activated, it can be determined that the cluster group where the MS of the call is located has not been assigned an SDU, otherwise it is determined that the SDU is allocated to the cluster group where the MS of the call is located.

The state information of the cluster group is static, that is, the state control block is allocated to each cluster group in advance, and the state information of each cluster group is recorded. Whenever a cluster group establishes a call, the cluster group The status control block will record its status information, and the cluster group status information includes: the cluster group is activated and the MS information of the established call connection, etc.; and the establishment of the cluster group status information can also be dynamic, that is, : The status control block is not assigned to each cluster group in advance, and the status information of each cluster group is not recorded. Whenever a cluster group establishes a call, the state control block is assigned to the cluster group, and the cluster is assigned to the cluster. Group status information is recorded. Therefore, if the cluster group status information is established in a dynamic manner, when 888 > can not query the cluster group status information according to the group ID of the current call, the cluster group in which the MS of the current call is located can be determined. The SDU is not assigned, otherwise the SDU is assigned to the cluster group where the MS of the call is located.

Step 404: The SDU allocation module queries the cluster group status information saved by the BSC according to the group identifier by the CC, and determines the SDU that has been allocated for the current call cluster group, according to the information of the allocated SDU, such as the SDU ID, etc., in the SDU. The F-TCH is established on the MS for this call, and the current processing is ended.

Here, the process of establishing an F-TCH on the SDU according to the information of the SDU includes: the SDU allocation module sends a channel establishment indication to the SDU according to the information of the allocated SDU, where the SDU establishes an F-TCH for the MS of the current call. .

Step 405: The SDU allocation module selects a new SDU, and sends a channel establishment indication to the SDU. The SDU establishes an F-TCH for the MS of the call, and ends the current processing. Here, the process in which the SDU allocation module selects the SDU and transmits the channel establishment indication may be referred to as a process of allocating SDUs.

The steps 401 to 405 are processing of a call setup request for an MS according to the present invention, and the BSS performs the above steps for each call setup request received. The processing of 401 to 405, so that the F-TCHs of the MSs of the same cluster group in the same BSS coverage are all established in the same SDU, so that the F-TCHs of the same cluster group MS in the same cell can be ensured to be established in the same In the SDU.

The above-mentioned processing is the first solution of the method of the present invention. In this solution, the F-TCHs of the same cluster group MS in the same BSS coverage are all established in the same SDU, and the scheme 1 is applicable to the cluster group. A cluster system with a small number of MSs and a cluster of MSs in the same group. If the number of MSs in a cluster group is 4艮 or is distributed in many cells, the above processing method is difficult to implement. For this case, the cluster system can be implemented by using the second method of the method of the present invention. After step 403, the processing steps are as follows:

Step 404: The SDU allocation module queries the group status information of the cluster group saved by the BSC according to the group identifier, determines the SDU that has been allocated for the current call cluster group, and determines the current call cluster group according to the information of the allocated SDU. Whether there is an SDU that can establish an F-TCH for the MS of the call for each of the allocated SDUs, if yes, go to step 406; otherwise, go to step 405.

Step 405: The SDU allocation module selects a new SDU, and sends a channel establishment indication to the SDU. The SDU establishes an F-TCH for the MS of the call, and ends the current processing.

Step 406: The SDU allocation module selects an SDU from all SDUs that can establish an F-TCH for the MS according to the information of the queried SDU, and sends a channel establishment indication to the selected SDU, where the SDU establishes an F-TCH for the MS of the current call. End the current process.

Therefore, in this solution, when an SDU establishes an F-TCH for the MS of the call, it must follow a criterion that the MSs of the same cell in the same cluster group must establish an F-TCH in the same SDU. Therefore, in determining whether there is an SDU capable of establishing an F-TCH for the MS of the current call, it is necessary to first check the IDs of all cells in which the F-TCH has been established in each SDU, as long as the cell in which one of the SDUs has established the F-TCH In the cell where the MS of the current call is located, the SDU must establish an F-TCH for the MS. Thus, in the determining and selecting process described in step 404, it is first necessary to check the ID of the cell in which the current call MS is located with the IDs of all cells in which the F-TCH has been established in each SDU, as long as one of the SDUs has established F- If the cell of the TCH includes the cell where the MS of the current call is located, it is determined that there is an SDU capable of establishing an F-TCH for the MS, and the SDU is selected to establish an F-TCH for the MS; if each SDU has established a F-TCH cell The cell in which the MS of the current call is not included is determined by the set access control threshold as described below. The access control threshold may be: an MS number threshold, a load threshold, or a cell number threshold. Here, the BSS can query the cluster group status information according to the group identifier of the current call, obtain the cluster group status information of the current call MS, and then retrieve the SDU information according to the SDU information in the cluster group status information. Establishing an ID of all cells of the F-TCH; the SDU information includes: an SDU ID, an MS number, a cell ID, a load level, and the like, and since one cluster group can occupy one or more SDU resources, the SDU retrieves the SDU The information can be one or more SDU information.

If the MS number threshold or the load threshold is set, the MS number and the load level of each SDU after accessing the current call MS are estimated according to the SDU information, and it is determined whether the MS number or the load level estimation value of the SDU does not exceed the corresponding threshold. If yes, it is determined that there is an SDU capable of establishing an F-TCH for the MS; otherwise, there is no SDU for establishing an F-TCH for the MS.

If the cell number threshold is set, the SDU information further includes a cell range, and then it is determined whether the cell range in the SDU information includes the cell where the MS of the current call is located, and if yes, it is determined that the F- can be established for the MS. SDU of the TCH; otherwise the decision does not have an SDU that can establish an F-TCH for the MS.

The BSS allocates a cell range for each SDU according to the number of cells of each SDU, and the cell range may be identified by one or more cell IDs, so that the judgment may be performed when the judgment is performed. ID and each cell of the cell where the current MS is called The cell ID of the cell range is matched in the SDU information. If the cell ID of the cell range is included in the SDU, and the cell ID of the current SDU does not exceed the threshold of the cell number set by the SDU, the cell range is indicated. The cell where the MS of the current call is located; otherwise, the cell range does not include the cell where the MS of the current call is located. Here, the number of cells of the SDU is the number of cells that have established an F-TCH in the SDU, and the cell ID in the SDU information is an ID of a cell that has established an F-TCH in the SDU, and thus may be based on the SDU information. The cell ID counts the number of cells described. Obviously, if the threshold of the number of cells is set to 1, the implementation of the current cluster system is to allocate an SDU to each cell in the same cluster group to establish an F-TCH. According to the implementation of the existing network, the scheme is also currently implemented. The preferred solution for cluster system implementation.

In addition, the method for selecting an SDU to establish an F-TCH for the calling MS is also arbitrarily selected: an SDU can be arbitrarily selected from all SDUs that can establish an F-TCH for the current calling MS; or according to a preset selection criterion. An SDU with the lowest current load, or an SDU having the smallest number of MSs, or an SDU with the smallest number of cells, and the like are selected from the SDUs. However, the present invention is not limited.

The steps 401 to 406 in the foregoing solution 2 are the processing of a call setup request for an MS, and the BSS performs the processing of the foregoing steps 401 to 406 for each call setup request received, according to the above In the method of selecting and allocating SDUs, the solution can establish all F-TCHs of each MS of the same cluster group in the same cell in the same BSS coverage in the same SDU.

In the foregoing solution 2, how to ensure that the MSs in the same cell in the same cluster group are allocated in the same SDU in the access control threshold, which is related to the setting of the cluster group and the specific implementation of the SDU, is not the design of the present invention. Therefore, it is set here that the MSs in the same cell in the same cluster group can be allocated in the same SDU within the access control threshold, that is, the current call is included in the cell in which one of the SDUs has established the F-TCH. The cell where the MS is located, When the SDU is connected to the MS, the SDU can be prevented from accessing the current access control threshold according to the access control threshold. The MS of the cell can ensure that the SDU can access all the MSs of the cluster group in the cell where the currently called MS is located in subsequent calls.

In addition, in the foregoing schemes 1 and 2, when a new SDU is allocated to the calling MS, whether the allocated new SDU can access the call within the access control threshold during the subsequent call establishment process. All the MSs in the cluster group where the MS is located in the same BSS, or the MSs in the same cell group and the same cluster group, and the cluster group settings and SDU implementation. Related, it is not a problem of the design of the present invention, so it is set here: the allocated new SDU can access all the MSs under the BSS of the cluster group of the MS in which the call is located according to the current system implementation, or this time The MSs that are calling belong to the same cell and all MSs of the same cluster group.

In addition, in the above two schemes, an F-TCH is established for each MS on the SDU, and the F-TCHs established for the MSs of the same cell in the same cluster group have the same WALSH code and long code, which are the same cluster. The F-TCH established by the MSs of different groups of cells may have the same or different WALSH codes and long codes. Here, when an F-TCH having the same WALSH code and a long code is established for the MSs of the same cell in the same cluster group, the BSS can be automatically set according to the cluster group and the cell where the current MS is located, and the specific implementation process is not in the present invention. Focus, so I won't go into details here.

The foregoing processing is performed by the method of the present invention for a BSS. For a cluster call, the MSs of the same cluster group may be distributed within the coverage of multiple BSSs. For a call of a cluster group, each MS will establish a call. The request is sent to the BSS to which they belong, and each BSS performs the above processing for each call setup request received, thereby establishing an F-TCH for each MS of the cluster group.

It can be seen from the above BSS that the F-TCH is established for the MS, using the method of the present invention, When a cluster call is established, the MSs of the same cell or different cells in the same cluster group can establish an F-TCH in the same SDU. FIG. 5 is a schematic diagram of the implementation principle of the cluster system establishing an F-TCH for the same cluster group MS in the method of the present invention. . In FIG. 5, the same cluster group MS currently performing the call includes: MS1, MS2, MS3, MS4, MS5, where MS1, MS2, and MS3 belong to BSS1, and MS4 and MS5 belong to BSS2, when the cluster group MS When the call is initiated, each MS sends a call setup request to BSS1 and BSS2, respectively, and BSS1 and BSS2 respectively establish an F-TCH for each MS according to the MS information in each call setup request. For MS1, MS2, and MS3 in the same cell under BSS1, BSS1 allocates SDU _U to establish F-TCH11, F-TCH12, and F-TCH13 for the three MSs respectively; for MS4 and MS5 in the same cell under BSS2, BSS2 allocates SDUs ₂₁ F-TCH21 and F-TCH22 are established for MS4 and MS5, respectively. In this way, in the service frame distribution process, the MS1, the MS2, and the MS3 of the same cell receive the service frame from the same SDUn, and the MS4 and the MS5 of the same cell receive the service frame from the same SDU ₂₁ , so that each MS merges the received service frame. The service frame can guarantee alignment during decoding.

In the method of the present invention, the service frame distribution process described in FIG. 2 and the process of establishing an F-TCH for the MS allocation SDU described in FIG. 4 belong to two relatively independent processes, but for a cluster call of an MS, the BSS It is necessary to first allocate the SDU, establish the F-TCH as described in FIG. 4, and then distribute the service frame as described in FIG. The BSS performs the processing described in FIG. 4 every time the call setup request of the MS is received, and as long as a cluster group is activated, the BSS continues to perform the processing of the distribution service frame described in FIG. 2 for the cluster group, for example: The service frame is distributed once every 20 ms, but each time the service frame is distributed, the BSS will transmit according to the number of SDUs currently allocated for the cluster group and the number of F-TCHs established on the SDU.

In the above solution, the F-TCHs of each MS in one or more cells in the same cluster group are established in the same SDU, thereby saving a large amount of SDU processing resources, reducing the load of the BSS, optimizing system resources, and F-TCH establishment of MSs of the same cluster group in a small area In the same SDU, the service frame distribution enables the service frame alignment to be ensured, so that the cluster group MS can correctly merge and decode the service frames distributed on each F-TCH.

The method of the present invention can also be applied to CDMA 2000 and CDMA IX systems, and the processing method is the same as the above-described processing applied to the CDMA system, and will not be described in detail herein.

In summary, the method of the present invention can align the service frames distributed on the F-TCHs of the MSs of the same cluster group in the same cell, thereby ensuring correct reception of service frames and greatly saving SDU processing resources.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A method for distributing a cluster service frame, the method comprising: the base station system BSS, when establishing a trunking call, allocates the same selective distribution unit SDU to each MS of the same cluster group in the same cell to establish a forward traffic channel. ;

2. The method according to claim 1, wherein the method for determining a trunk call is: the BSS determines whether the call is a trunk call according to a service option SO or a message type in the call setup request. .

The method according to claim 1, wherein the process of allocating an SDU to establish a forward traffic channel specifically includes:

all.BSS determines whether the SDU has been assigned to the cluster group of the call, and if so, performs step al3; otherwise, step al2;

The method according to claim 3, wherein, in step a3, the method for determining, by the BSS, that the SDU is allocated to the current call cluster group is: the BSS is based on the group in the current call setup request. The identifier information is used to query the cluster group status information saved by itself, and is determined as the SDU that has been allocated by the cluster group.

The method according to claim 1, wherein the processing of allocating the SDU to establish the forward traffic channel specifically includes: A21. The BSS determines whether the SDU has been allocated to the cluster group of the call, and if yes, step a22; otherwise, step a23;

A22. The BSS determines whether there is an SDU that can establish a forward traffic channel for each of the allocated SDUs of the call cluster group, and if so, establish a forward direction from the MS that can be the current call. The SDU of the service channel selects the SDU to establish a forward traffic channel for the MS of the call, and ends the process of establishing the forward traffic channel; otherwise, step a23 is performed.

A23. The BSS allocates a new SDU to establish a forward traffic channel for the MS of the call.

The method according to claim 3 or 5, wherein the determining whether the SDU has been assigned to the cluster group of the call is: a group identifier in the current call setup request, and a cluster saved by itself. Group status information is judged.

The method according to claim 5, wherein, in step a22, the determining is: the BSS queries the cluster group status information according to the group identifier in the current call setup request, and determines that the cluster group is the cluster group. The assigned SDU is further determined based on the information of the allocated SDU.

The method according to claim 5, wherein, in step a22, the selecting the SDU is: arbitrarily selecting an SDU from all SDUs that can establish a forward traffic channel for the MS that can be the current call, or pressing The predetermined selection criteria are selected in all SDUs that can establish a forward traffic channel for the MS that is the current call.

9. The method of claim 1, 3 or 5, wherein the assigning the SDU to establish the forward traffic channel is: the forward traffic channels established for the MSs of the same cluster group in the same cell have the same Walsh WALSH code and long code.

The method according to claim 1, wherein the BSS distribution service frame to the SDU is: the BSS distributes the service frame to each SDIL according to the total number of SDUs allocated by the cluster group of the call.

The method according to claim 1, wherein the SDU distributes a service frame: each SDU distributes a service frame to each forward service according to a total number of forward traffic channels established by each SDU. Traffic channel.

12. A base station controller BSC for implementing service frame distribution, the BSC comprising: a control unit CC and an SDU; when establishing a trunk call, the CC receives a trunk call setup request, and the SDU is configured according to the received channel establishment indication The MS establishes a forward traffic channel; when distributing the service frame, the SDU receives the service frame for each SDU of the current cluster group MS and distributes to each of the established forward traffic channels; and the BSC is characterized in that the BSC Also includes:

The SDU allocation module receives the cluster call setup request from the CC, queries the cluster group status information through the CC, selects the same selection distribution unit SDU for each MS of the same cluster group in the same cell, and sends a channel establishment indication to the selected SDU.

The BSC according to claim 12, wherein the SDU allocation module is an independently set entity; or is integrated in the CC.