CN100384266C - A service frame distribution method in digital trunking system - Google Patents

Abstract

The invention discloses a method for distributing service frames in a digital trunking system. The processing steps are as follows: a. When a base station system (BSS) establishes a trunking call, the trunking group where the calling user (MS) is located is in the same cell Each MS of the group allocates the same selection distribution unit (SDU) to establish the forward traffic channel; b. When the BSS distributes the business frame, it sends the business frame to each SDU that establishes the forward traffic channel for the group MS, and then the Each SDU distributes the service frame to each forward service channel established by itself. By adopting the method of the invention, the service frames distributed on the forward service channels of the MSs of the same cluster group in the same cell can be aligned, and a large amount of SDU processing resources can be saved.

Description

A service frame distribution method in digital trunking system

technical field

The invention relates to a service frame distribution technology, in particular to a service frame distribution method in a digital trunking system.

Background technique

At present, when digital trunking services are implemented in CDMA, CDMA 2000 or CDMA 1X systems, in order to save base station power, the method of sharing forward traffic channels is generally adopted. The base station sends service frames through forward shared traffic channels, and multiple users (MS ) while monitoring the forward shared traffic channel to obtain traffic frames. An implementation scheme of the forward shared traffic channel is: for the same group under the same cell, the base station jointly transmits the forward traffic channel (F-TCH) through multiple channel elements (CEs), and all transmitted F-TCHs have the same Walsh (WALSH) code and long code, the MS decodes the received F-TCH together, and its received power is equal to the sum of all F-TCH transmit powers with the same WALSH code and long code in this cell, thus from the logic To achieve the purpose of sharing F-TCH. The F-TCH described herein only represents the forward traffic channel established for the MS, and is not limited to a specific channel type.

Among them, when establishing F-TCH, different MSs establish F-TCHs in different selection and distribution units (SDUs), so in the process of sending downlink service frames, different MSs of the same group under the same cell send service frames through different SDUs . FIG. 1 is a schematic diagram of a processing method for establishing an F-TCH for MSs in the same trunking group in an existing trunking system. In the existing trunking system, the trunking server (PTT Server), as the control center of the trunking service, is mainly responsible for the call control of the trunking service, media stream distribution, etc. When a trunking call is initiated to a trunking group MS, each MS will call The establishment request is sent to the respective base station systems (BSS), and the call establishment request may be a call origination request, a paging response, or a request to join a group call. As shown in Figure 1, the same cluster group MS that is currently calling includes: MS1, MS2, MS3, MS4, and MS5, wherein MS1, MS2, and MS3 belong to BSS1, and MS4 and MS5 belong to BSS2. When a group of MSs initiates a call, the PTT Server sends call establishment requests to BSS1 and BSS2 respectively, and BSS1 and BSS2 establish F-TCHs for each MS according to the MS information in each call establishment request. Because different MSs establish F-TCH in different SDUs, therefore, BSS1 allocates SDU ₁₁ for MS1 to establish F-TCH11, allocates SDU ₁₂ for MS2 to establish F-TCH12, and allocates SDU ₁₃ for MS3 to establish F-TCH13; BSS2 Allocate SDU ₂₁ for MS4 to establish F-TCH21, and allocate SDU ₂₂ for MS5 to establish F-TCH22.

However, for an MS, if the F-TCHs of all MSs in the same group under the same cell are to be successfully combined and decoded, the service frames sent on each F-TCH must be aligned, otherwise it will cause interference to the MS, making the MS unable to Receive business frames correctly. It can be seen from the process of establishing F-TCH for MS shown in Figure 1 that if MS1, MS2 and MS3 are MSs in the same cell, and their F-TCHs are respectively established on different SDUs, in this way, it is necessary to combine and decode each F-TCH Based on 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 each F-TCH are the same, and the time interval of each service frame arriving at the MS is within the specified time delay range.

In addition, for digital trunking systems, it is usually necessary to establish F-TCHs for a large number of MSs in multiple cells at the same time to send service frames, which will waste a large amount of SDU processing resources in the system, which is not conducive to the realization of digital trunking systems.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for distributing service frames in a digital trunking system, so that the service frames distributed on the forward traffic channel of the same cluster group MS in the same cell can be aligned, and can save a lot of SDU handles resources.

In order to achieve the above object, the technical solution of the present invention is achieved in the following way: the present invention discloses a service frame distribution method in a digital trunking system, and the processing steps are:

a. When the BSS establishes a trunking call, it allocates the same SDU to each MS in the same cell of the trunking group where the calling MS is located to establish a forward traffic channel;

b. When the BSS distributes the service frame, it sends the service frame to each SDU that establishes the forward traffic channel for the trunk group MS, and then each SDU distributes the service frame to each forward traffic channel established by itself.

In step a, the process of establishing the forward traffic channel specifically includes:

a11. The BSS judges whether the SDU has been allocated to the cluster group where the calling MS is located, if yes, execute step a13; otherwise, execute step a12;

a12. The BSS assigns a new SDU to establish a forward traffic channel for the MS of this call, and executes step b;

a13. The BSS establishes a forward traffic channel for the MS of this call on the allocated SDU of the cluster group.

In step a11, the judgment is: the BSS inquires the trunk group state information stored by itself according to the group identification information in the call establishment request to make the judgment.

In step a13, the method for the BSS to obtain the allocated SDU information of the cluster group is as follows: the BSS queries the status information of the cluster group stored by itself according to the group identification information in the call establishment request, and obtains the allocated SDU information of the cluster group. SDU information.

In step a, the process of establishing the forward traffic channel specifically includes:

a21. The BSS judges whether the SDU has been allocated to the cluster group where the calling MS is located, if yes, execute step a22; otherwise, execute step a23;

a22. The BSS judges whether there is an SDU that can establish a forward traffic channel for the MS of this call. If yes, select an SDU from the SDUs allocated by the trunking group to establish a forward traffic channel for the MS, and execute step b; otherwise Execute step a23.

a23. The BSS allocates a new SDU to establish a forward traffic channel for the MS of this call.

In step a21, the judgment is: the BSS inquires the trunk group state information saved by itself according to the group identification information in the call establishment request to make the judgment.

In step a22, the judgment is: the BSS queries the cluster group state information according to the group identification information in the call setup request, obtains the cluster group state information where the calling MS is located, and then according to the cluster group state information in the cluster group state information SDU information for judgment.

In step a22, the selection of the SDU is: arbitrarily select an SDU from all SDUs that can establish forward traffic channels for the MSs of this call, or select an SDU among all the MSs that can establish forward traffic channels for this call according to predetermined selection criteria. The selection is made in the SDU of the traffic channel.

Wherein, when the forward traffic channel is established for the MS on the SDU, the forward traffic channel established for the MS in the same cell of the cluster group has the same WALSH code and long code.

In step b, the BSS distributes the service frame to each SDU according to the total number of SDUs allocated by itself for the cluster group where the calling MS is located.

In step b, each SDU distributes service frames to each forward traffic channel according to the total number of forward traffic channels established by itself.

As can be seen from the above scheme, the key of the present invention is: each MS of the same cluster group in the same cell establishes a forward traffic channel in the same SDU, and each SDU that establishes a forward traffic channel establishes a forward traffic channel in each forward traffic channel established by itself. Distribute service frames on the network.

Therefore, the service frame distribution method in the digital trunking system provided by the present invention can align the service frames sent on the forward service channels of MSs in the same cluster group in the same cell, thereby ensuring that the MSs can correctly process the service frames Merge decoding and greatly save SDU processing resources.

Description of drawings

FIG. 1 is a schematic diagram of a processing method for establishing an F-TCH for MSs in the same cluster group in an existing trunking system;

Fig. 2 is the schematic flow chart of BSS distributing business frames in the method of the present invention;

Fig. 3 is a schematic diagram of the processing flow of a preferred embodiment in which the BSS establishes an F-TCH for the MS in the method of the present invention;

Fig. 4 is a schematic diagram of the implementation principle of establishing an F-TCH for MSs in the same cluster group by the trunking system in the method of the present invention.

Detailed ways

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

In the method of the invention, the same SDU establishes F-TCH for each MS of the same cluster group in the same cell and distributes service frames. Taking the CDMA system as an example, the processing of the method of the present invention will be described in detail below.

When establishing a cluster call, MSs of the same cluster group in the same cell establish F-TCH in the same SDU. Based on this call establishment method, the method of distributing service frames in the SDU during the data processing of the service plane is shown in Figure 2.

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

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

Step 202: The BSS distributes the service frame to each SDU that establishes the F-TCH for the cluster group where the MS of this call is located.

Wherein, in the call establishment process of a trunking group, when the BSS allocates SDUs to the MS, the number of allocated SDUs is counted, for example: the total number of SDUs is set to 0 in advance, and each time a SDU is allocated to the trunking group, It will add 1 to the current total number of SDUs, and finally obtain the total number of SDUs allocated for the cluster group. Therefore, in this step, the BSS can distribute the service frames to each SDU according to the total number of SDUs.

Step 203: Each SDU described in step 202 distributes the received service frame to each F-TCH established by itself.

Here, during the call establishment process of a trunking group, when the SDU establishes an F-TCH for the MS, the SDU counts the number of F-TCHs. For example, the total number of F-TCHs is set to 0 in advance, and each MS To establish an F-TCH, the total number of current F-TCHs will be added by 1, so as to finally obtain the total number of F-TCHs established by itself. Therefore, in this step, the SDU can distribute service frames to each F-TCH according to the total number of F-TCHs.

Step 204: Each MS performs combined decoding on the F-TCH of the same cluster group in the same cell, so as to finally receive the service frame.

In the method of the present invention, for a cluster group, the F-TCHs set up for MSs in the same subdistrict on the SDU have the same WALSH code and long code, so the F-TCHs of the same cluster group MSs in the same subdistrict must be With the same WALSH code and long code, each MS can decode these F-TCHs in combination.

Because, in the call establishment process of the method of the present invention, the F-TCH of the same cluster group MS in the same cell must be established in the same SDU. In addition, for the existing soft handover, the system establishes a soft handover channel for the MS in the same SDU branch, and distribute the service frame to a soft handoff channel branch according to the frame processing (FP) protocol of the CDMA system, and the frame sequence number and time delay adjustment of the service frame distributed in each channel branch according to the FP protocol can ensure frame alignment, thereby The MS performing soft handover can combine and decode each channel branch. Therefore, the method of the present invention can also follow the processing specified in the FP protocol when distributing service frames in the same SDU, thereby ensuring that the service frames distributed in each F-TCH can be aligned. The MS can correctly combine and decode the F-TCHs of the same cluster group in the same cell.

The key of the method of the present invention to realize the service frame distribution method shown in Figure 2 is that in the call setup process, the F-TCH of the same cluster group MS in the same cell is set up on the same SDU, the method of the present invention in the call setup process below processing is described in detail. Fig. 3 is a schematic diagram of a processing flow of a preferred embodiment in which the BSS establishes an F-TCH for the MS in the method of the present invention. As shown in Figure 3, the specific processing steps are as follows:

Step 301: The BSS receives a call setup request. Here, the call establishment request may be a call origination request, a paging response, or a group call joining request, etc., and the BSS receives the call establishment request from the MS side.

Step 302: The BSS judges whether the current call is a group call according to the call establishment request, and if so, executes step 303; otherwise, ends the current processing.

Wherein, the BSS can judge whether the current call is a group call according to the service option (SO) in the call setup request, or according to the message type of the call setup request. Here, according to specific implementation conditions, a field indicating a message type may be added to the call establishment request.

Step 303: The BSS reads the group identification information in the call establishment request, and queries the trunk group status information saved by itself according to the group identification information, so as to determine whether the SDU has been allocated to the trunk group where the calling MS is located , if yes, go to step 304; otherwise, go to step 305. The MS of this call mentioned in this paper refers to the calling MS for the call origination request, and refers to the MS requesting to join the group call for the paging response or the request to join the group call.

In the cluster system, cluster groups are divided into two types: permanent group and temporary group; the so-called permanent group is the fixed cluster group that the system divides MS into in advance, and the system will permanently store the information of such cluster group; the so-called temporary group is MS Temporarily formed trunking group, when the trunking group call ends, the system will release the trunking group information.

Here, the group identification information is a fixed group ID for a permanent group, and may be a temporarily dynamically allocated group ID for a temporary group, or may be the calling MS number or device identification in this call request Number, such as: Mobile Station Number (MDN), International Mobile Subscriber Identity (IMSI) or Electronic Serial Number (ESN), etc. The BSS can query the corresponding cluster group status information according to the group ID, or can use the hash (HASH) algorithm to obtain the index value according to the calling MS number or the device identification number to find the corresponding cluster group status information.

Wherein, the cluster group state information includes: activation status, MS connection status and other information, and, for the cluster group that has been activated, the cluster group status information further includes: each MS that has been connected The ID of the cell where it is located and the information of the allocated SDUs. Therefore, the BSS can judge whether the SDU has been allocated to the cluster group where the MS of this call is located according to the MS connection status or activation status. The cluster group where the MS is located has not allocated an SDU, otherwise it is determined that an SDU has been allocated for the cluster group where the MS of this call is located.

The establishment of the state information of the above trunking groups is static, that is, each trunking group is assigned a state control block in advance to record the state information of each trunking group. Whenever a trunking group establishes a call, the trunking group The state control block of the state control block will record its state information, and the state information of the group group includes: the MS information that the group group is activated and the call connection has been established, etc.; the establishment of the state information of the group group can also be dynamic, namely : No status control block is 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 status control block is allocated for the cluster group, and the status information of the cluster group is not recorded. Group status information is recorded. Therefore, if the trunking group status information is established in a dynamic manner, when the BSS cannot find the trunking group status information according to the group identification information of this call, it can judge whether the trunking group where the MS of this call is located is still No SDU is allocated, otherwise it is judged that the SDU has been allocated for the cluster group where the MS of this call is located.

Step 304: BSS inquires the trunking group state information saved by itself according to the group identification information, obtains the SDU information for which the F-TCH has been established for the trunking group, such as SDU ID, etc., and establishes the F-TCH for the calling MS on this SDU. F-TCH, end the current processing.

Step 305: The BSS allocates a new SDU to establish the F-TCH for the MS of this call, and ends the current processing.

The steps 301 to 305 are the processing of the present invention for a call establishment request of an MS, and the BSS will execute the processing of the above steps 301 to 305 for each call establishment request received, so that the same BSS coverage All the F-TCHs of MSs in the same cluster group are established in the same SDU, so it can be guaranteed that the F-TCHs of MSs in the same cluster group in the same cell are established in the same SDU.

The above-mentioned processing is the first scheme of the method of the present invention. In this scheme, the F-TCHs of the MSs of the same cluster group within the coverage of the same BSS are all established in the same SDU. This scheme one is suitable for smaller clusters. , A cluster system with a small number of MS. If the number of MSs in a cluster group is large or distributed in many cells, then the above-mentioned processing method is just more difficult to realize. In this case, the scheme two of the method of the present invention can be used to realize the cluster system, and then the above steps are performed. After 303, the processing steps are as follows:

Step 304: The BSS judges whether there is an SDU capable of establishing an F-TCH for the calling MS, and if yes, executes step 306; otherwise, executes step 305.

Step 305: The BSS allocates a new SDU to establish the F-TCH for the MS of this call, and ends the current processing.

Step 306: The BSS selects an SDU from all SDUs capable of establishing an F-TCH for the MS to establish an F-TCH for the MS, and ends the current process.

Because, in this solution, when the SDU establishes the F-TCH for the MS of this call, a rule must be followed, that is: MSs in the same cell in the same cluster group must establish the F-TCH in the same SDU. Therefore, when judging whether there is an SDU that can establish F-TCH for the MS calling this time, you must first check the IDs of all the cells that have established F-TCH in each SDU, as long as there is a cell that has established F-TCH in one of the SDUs If the cell where the MS of this call is included in the SDU, the F-TCH must be established for the MS by the SDU.

In this way, in the judgment and selection process described in step 304, it is first necessary to check the ID of the cell where the calling MS is located with the IDs of all cells that have established F-TCH in each SDU, as long as one of the SDUs has established F-TCH The cell of the TCH includes the cell where the MS of this call is located, judge that there is an SDU that can establish an F-TCH for the MS, and select the SDU to establish an F-TCH for the MS; if the cell of the F-TCH has been established for each SDU The cell where the MS of this call is not included in the cell is judged according to the set access control threshold as described below. The access control threshold may be: a threshold for the number of MSs, a threshold for load, or a threshold for the number of cells. Here, the BSS can query the trunking group state information according to the group identification information of this call, obtain the trunking group state information where the calling MS is located, and then retrieve the SDUs established in each SDU according to the SDU information in the trunking group state information. The IDs of all cells of F-TCH; the SDU information includes: SDU ID, MS number, cell ID and load level, etc., and since a cluster group can occupy one or more SDU resources, the SDU information retrieved by the BSS Can be one or more SDU information.

If the MS number threshold or load threshold is set, estimate the MS number and load level of each SDU after accessing the calling MS according to the SDU information, and judge whether the estimated value of the MS number or load level of any SDU does not exceed the corresponding threshold , if there is, it is judged that there is an SDU that can establish the F-TCH for the MS; otherwise, it is judged that there is no SDU that can establish the F-TCH for the MS.

If the threshold of the number of cells is set, the SDU information further includes the cell range, and it is judged whether the cell range in the SDU information includes the cell where the MS of this call is located, and if so, it is judged that it is possible to establish an F- SDU of TCH; otherwise, it is judged that there is no SDU of F-TCH for the MS.

Wherein, when setting the cell number threshold, the BSS will configure the cell range for each SDU according to the cell number threshold of each SDU, and the cell range can be identified by one or more cell IDs. In this way, the judgment can be made Match the ID of the cell where the calling MS is located with the cell ID representing the cell range in each SDU information. If an SDU can be found, the cell ID representing the cell range includes this cell ID, and the number of cells in the current SDU does not exceed itself If the threshold of the number of cells is set, it means that the cell range includes the cell where the MS calling this time is located; otherwise, it means that the cell range does not include the cell where the MS calling this time is located. Here, the number of cells in the SDU is the number of cells that have established F-TCH in this SDU, and the cell ID in the SDU information is the ID of a cell that has established F-TCH in this SDU. Therefore, according to the number of cells in the SDU information, The cell ID counts the number of cells mentioned above. Obviously, if the threshold of the number of cells is set to 1, the current implementation of the 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, this solution is also the current cluster system The preferred solution for system implementation.

In addition, there are many ways to select the SDU to establish the F-TCH for the calling MS: one SDU can be arbitrarily selected from all SDUs that can establish the F-TCH for the calling MS; Select an SDU with the lowest current load, or an SDU with the smallest number of MSs, or an SDU with the smallest number of cells, etc. from these SDUs, but the specific criteria to be set are not limited by the present invention.

Steps 301 to 306 described in the above scheme 2 are the processing of a call establishment request of an MS in the present invention, and the BSS will execute the processing of the above steps 301 to 306 for each call establishment request received, according to the above The method for selecting and allocating SDUs is described above. In this solution, all the F-TCHs of MSs in the same cluster group in the same cell within the coverage of the same BSS can be established in the same SDU.

In the above scheme two, how to ensure that the MSs in the same cell in the same cluster group can be allocated to the same SDU within the access control threshold is related to the setting of the cluster group and the specific implementation of the SDU, which does not belong to the design of the present invention Therefore, it is set here that MSs in the same cell in the same cluster group can be assigned to the same SDU within the access control threshold, that is, when one of the SDUs is retrieved, the cell that has established the F-TCH includes this call The cell where the MS is located, and when the SDU accesses the cell MS, it can be guaranteed that the MS access status of the SDU will not exceed the set access control threshold; or, when it is judged according to the access control threshold that a certain SDU can When accessing the MS in the calling cell this time, it can be guaranteed that this SDU can access all MSs in the cluster group in the cell where the currently calling MS is located in subsequent calls.

In addition, in the above schemes 1 and 2, when a new SDU is allocated to the MS for this call, whether the allocated new SDU can access this call within the access control threshold during the subsequent call establishment process The problem of all MSs in the cluster group where the MS belongs to the BSS, or all MSs belonging to the same cell and the same cluster group as the calling MS is related to the setting of the cluster group and the specific implementation of the SDU, not to the The problem of the design of the present invention, so it is set here: the new SDU allocated can be connected to all MSs under the BSS in the cluster group where the MS of this call is located according to the current system implementation situation, or belong to the same MS as the MS of this call. All MSs in the same cell and 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-TCH established for the MSs in the same cell of the same cluster group has the same Walsh code and long code, which is the same cluster The WALSH code and long code of the F-TCH established by MSs in different cells can be the same or different. Here, when an F-TCH with the same WALSH code and long code is established for MSs in the same cluster group and the same cell, the BSS can automatically set it according to the cluster group and cell where the current MS is located, and its specific implementation process does not belong to the present invention important, so it will not be detailed here.

The above-mentioned processing is the processing 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 set up the call The requests are sent to their respective BSSs, and each BSS will perform the above processing for each received call establishment request, so as to establish an F-TCH for each MS in the cluster group.

It can be seen from the above processing that BSS establishes F-TCH for MS, using the method of the present invention, when establishing a cluster call, MSs in the same cell or different cells of the same cluster group can establish F-TCH in the same SDU, Figure 4 shows the method of the present invention Schematic diagram of the implementation principle of establishing F-TCH for MSs in the same trunking group by the trunking system. In Fig. 4, the same cluster group MS currently calling includes: MS1, MS2, MS3, MS4, MS5, wherein MS1, MS2 and MS3 belong to BSS1, MS4 and MS5 belong to BSS2, when the cluster group MS When initiating a call, each MS sends a call establishment request to BSS1 and BSS2 respectively, and BSS1 and BSS2 establish F-TCHs for each MS according to the MS information in each call establishment request. For MS1, MS2, and MS3 in the same cell under BSS1, BSS1 allocates SDU ₁₁ to establish F-TCH11, F-TCH12, and F-TCH13 for the three MSs; for MS4 and MS5 in the same cell under BSS2, BSS2 allocates SDUs ₂₁ Establish F-TCH21 and F-TCH22 for MS4 and MS5 respectively. In this way, in the service frame distribution process, MS1, MS2 and MS3 in the same cell receive the service frame from the same SDU ₁₁ , and MS4 and MS5 in the same cell receive the service frame from the same SDU ₂₁ , so that each MS performs a process on the received service frame Service frames can be aligned when combined and decoded.

In the method of the present invention, the service frame distribution process described in Figure 2 and the process of distributing SDUs for MSs and establishing F-TCHs as described in Figure 3 belong to two relatively independent processes, but for a cluster call of an MS, the BSS It is necessary to perform the processing of allocating SDUs and establishing the F-TCH as described in FIG. 3 first, and then perform the processing of distributing service frames as described in FIG. 2 . The BSS will execute the processing described in Figure 3 every time it receives a call establishment request from the MS, and as long as a cluster group is activated, the BSS will continue to process the distribution service frame described in Figure 2 for this cluster group, for example: A service frame is distributed every 20ms, but each time a service frame is distributed, the BSS will send it according to the number of SDUs currently allocated to the cluster group and the number of F-TCHs established on the SDUs.

In the above solution, the F-TCH of MSs in one or more cells in the same cluster group is established in the same SDU, which saves a lot of SDU processing resources, reduces the load on the BSS, and optimizes system resources. In addition, in the same cell The F-TCHs of the MSs in the same cluster group are established on the same SDU, and the alignment of the service frames can be ensured during the distribution of service frames, so that the MSs of the cluster group can correctly combine and decode the service frames distributed on each F-TCH.

The inventive method can also be applied to CDMA 2000 and CDMA 1X systems, and the processing method is the same as the above-mentioned processing applied to the CDMA system, and will not be described in detail here.

To sum up, the method of the present invention can align service frames distributed on the F-TCH of 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 descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (11)

1. the service frame distribution method in the digital cluster system is characterized in that treatment step is:

A. base station system BSS is when setting up trunked call, for each MS of cluster group in same sub-district at this calling party MS place distributes same selection Dispatching Unit SDU to set up forward traffic channel;

B.BSS sends each SDU that this cluster group MS most sets up forward traffic channel with traffic frame when the distribution service frame, traffic frame is distributed to each forward traffic channel of self setting up by this each SDU again.

2. method according to claim 1 is characterized in that, among the step a, described processing of setting up forward traffic channel specifically comprises:

A11.BSS judges whether to call out for this cluster set of dispense SDU at MS place, if, execution in step a13; Otherwise execution in step a12;

A12.BSS distributes new SDU to come to set up forward traffic channel for the MS of this calling, execution in step b;

A13.BSS sets up forward traffic channel for the MS of this calling on the SDU that this cluster group has been distributed.

3. method according to claim 2 is characterized in that, among the step a11, described being judged as: the BSS cluster group state information that inquiry self is preserved according to the group identity information in this setup requests is judged.

4. method according to claim 2, it is characterized in that, among the step a13, the method that BSS obtains the SDU information that described this cluster group distributed is: the BSS cluster group state information that inquiry self is preserved according to the group identity information in this setup requests obtains the SDU information that this cluster group has been distributed.

5. method according to claim 1 is characterized in that, among the step a, described processing of setting up forward traffic channel specifically comprises:

A21.BSS judges whether to call out for this cluster set of dispense SDU at MS place, if, execution in step a22; Otherwise execution in step a23;

A22.BSS judges whether and can set up the SDU of forward traffic channel for the MS of this calling, if having, selects SDU to set up forward traffic channel, execution in step b for this MS from the SDU that this cluster group has been distributed; Otherwise execution in step a23.

A23.BSS distributes new SDU to come to set up forward traffic channel for the MS of this calling.

6. method according to claim 5 is characterized in that, among the step a21, described being judged as: the BSS cluster group state information that inquiry self is preserved according to the group identity information in this setup requests is judged.

7. method according to claim 5, it is characterized in that, among the step a22, described being judged as: BSS is according to the group identity information query set group state information in this setup requests, obtain the cluster group state information that this calls out the MS place, judge according to the SDU information in this cluster group state information again.

8. method according to claim 5, it is characterized in that, among the step a22, described selection SDU is: select a SDU arbitrarily from all can set up the SDU of forward traffic channel for the MS of this calling, perhaps select in all can set up the SDU of forward traffic channel for the MS of this calling by the preset selection criterion.

9. according to claim 1,2 or 5 described methods, it is characterized in that described when setting up forward traffic channel for MS on SDU, the forward traffic channel of setting up for the MS in this same sub-district of cluster group has identical Walsh WALSH sign indicating number and long code.

10. method according to claim 1 is characterized in that, among the step b, BSS is by from the SDU sum that is distributed as this cluster group of calling out the MS place traffic frame being distributed to each SDU.

11. method according to claim 1 is characterized in that, among the step b, each SDU is distributed to each forward traffic channel by the forward traffic channel sum of self setting up with traffic frame.

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