CN1331367C - A method for controlling reversed service channel occupation by cluster user - Google Patents

Abstract

The present invention discloses a control method for occupying a reversed service channel by a cluster user. The method comprises that A, the priority of a cluster user in a cluster group is arranged in advance; B, when a reversed service channel does not occupy, a cluster service center causes a cluster user first sent a reversed calling request to occupy a reversed channel for communication; when the reversed service channel is occupied, the cluster service center causes the cluster user with high priority to occupy the reversed service channel for communication. The method ensures rapid access when the cluster service with high priority occupies the reversed service channel, and decreases the loads of BSS, and TSC or dispatching desks.

Description

A control method for trunking users to occupy reverse traffic channel

technical field

The invention relates to the trunking service field of a digital cellular system, in particular to a control method for a trunking user to occupy a reverse service channel.

Background technique

It is a technical development direction of the public mobile communication system to provide professional dispatching functions on the digital cellular system. The digital cellular system supporting the trunking service is a dedicated dispatching communication system, which can enable multiple trunking users to automatically share a small number of wireless channels and use these wireless channels dynamically. The digital cellular trunking system effectively collects the available time of all wireless channels through the dynamic allocation of frequencies, thereby providing each trunking user with the maximum available working time and minimizing channel blocking.

In order to enable the digital cellular system to support the trunking service, the forward traffic channel must be shared, and the reverse traffic channel is multiplexed by the preemption of the trunking users in the trunking group, so as to realize the reverse call function. An implementation process for cluster users in the cluster group to preempt the reverse traffic channel is as follows:

Step 1, a plurality of trunking users with push-to-talk (PTT) in the trunking group send a reverse preemption request message by pressing a button, and the message is sent to the trunking service center (TSC) or dispatcher by the base station subsystem (BSS);

Step 2. The TSC or the dispatching station performs operations such as forcibly inserting the reverse call of a certain trunking user or forcibly interrupting the reverse call of a certain trunking user to determine which trunking user can use the reverse traffic channel to make a call;

Step 3. The TSC or the dispatcher sends a confirmation message for accessing the reverse traffic channel message to the cluster user, and at the same time periodically broadcasts a forward prohibition message to the traffic channel through the BSS to prevent other PTTs in the cluster group The cluster user repeatedly sends preemption messages until the reverse call of the cluster user ends.

This process has the following disadvantages: Disadvantage 1, the cluster users in the cluster group do not have a preset priority, so the cluster users in the cluster group cannot preempt the reverse service channel according to their priority levels, so that high-priority services cannot be realized. The cluster user has the function of preempting the reverse service channel first; the second disadvantage is that since the number of cluster users in the cluster group is not limited, there may be a large number of cluster users simultaneously preempting the reverse service channel, so there are a large number of reverse call request messages All are sent to the TSC or dispatching station through the BSS, which has a greater impact on the BSS, TSC or dispatching station.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a control method for cluster users to occupy the reverse traffic channel, which can not only ensure the fast access of high-priority cluster users when they seize the reverse traffic channel, but also reduce Load of BSS and TSC or dispatcher.

According to above-mentioned purpose, concrete realization scheme of the present invention is as follows:

A method for controlling a cluster user to occupy a reverse traffic channel, the method comprising:

A. Set the priority for the cluster users in the cluster group in advance;

B. When the reverse service channel is not occupied, the cluster service center makes the first cluster user who sends a reverse call request occupy the reverse channel for communication;

When the reverse service channel is occupied, the cluster user who confirms that its own priority is higher than the priority of the cluster user currently communicating sends a reverse call request. After receiving the reverse call request, the cluster service center makes the cluster user with higher priority Users occupy the reverse traffic channel for communication.

In the step B, the step of enabling the cluster user with high priority to occupy the reverse traffic channel to communicate includes: the cluster user with high priority sends a reverse call request, and the request is forwarded to the cluster service center through the base station subsystem to which it belongs, The cluster service center interrupts the reverse communication of the current cluster user, so that the cluster user occupies the reverse channel for communication;

The process of step B confirming that its own priority is higher than the priority of the cluster user currently communicating is: the cluster user judges whether its own priority is higher than the cluster user currently communicating, if not, the cluster user is prohibited from sending a reverse call request; if yes, perform the steps of determining that it has a higher priority than the current communicating cluster user.

The method further includes: the cluster service center periodically broadcasts to the base station subsystem a reverse traffic channel occupancy message carrying a priority level, the priority level being the priority level of the cluster user with high priority as described in step B;

The base station subsystem periodically broadcasts a reverse traffic channel occupation message carrying a priority level to the cluster users to which it belongs, and the priority level is the priority level of the high priority cluster user described in step B. The method further includes: the cluster service center sends a message to the base station subsystem to release the reverse communication of the current cluster user, the base station subsystem releases the reverse communication of the current cluster user and returns a confirmation to the cluster service center, and the cluster service center sends a message through the base station subsystem The reverse call request of the cluster user with high priority described in step B is established, and the cluster user accesses the reverse traffic channel for reverse communication.

When the reverse traffic channel is not occupied, the step B further includes:

B1. A cluster user in the cluster group sends a reverse call request to the base station subsystem to which it belongs;

B2. The base station subsystem processes the reverse call request of the first cluster user who sends the reverse call request, and forwards the reverse call request to the cluster service center;

B3. The trunking service center processes the reverse call request of the first base station subsystem that sends the reverse call request message, and enables the trunking user sending the reverse call request to occupy the reverse traffic channel for communication through the base station subsystem.

Described step B2 further comprises:

The base station subsystem discards the received reverse talk request message sent subsequently.

Described step B2 further comprises:

The base station subsystem periodically broadcasts a reverse traffic channel occupation message carrying a priority level to all trunking users belonging to the base station subsystem, and the priority level is the priority level of the trunking user currently occupying the reverse traffic channel.

Described step B3 further comprises:

After the trunking service center returns a confirmation message to the base station subsystem that sent the first reverse call request message, it periodically broadcasts a reverse traffic channel occupation message with a priority level to all base station subsystems under its jurisdiction. The priority level is the currently occupied The priority level of the trunking users of the reverse traffic channel;

The trunking service center returns a reverse call rejection message to the base station subsystem that subsequently sends the reverse call request;

The base station subsystem that sent the first reverse talk request message forwards the confirmation message to the trunking user that sent the first reverse talk request message.

The reverse call rejection message carries a cause value, and the cause value is that the trunking group channel of the trunking service center is occupied.

The method further includes:

When the base station subsystem receives the confirmation message returned by the cluster service center, it updates the base station subsystem cluster group information, which includes the idle state of the base station subsystem cluster group and the cluster user information to perform reverse calls;

When the base station subsystem receives the reverse call rejection message returned by the cluster service center, it judges whether the cause value of the message is channel occupation, and if so, periodically broadcasts the reverse service channel occupation with priority to the cluster users under its jurisdiction message, the priority level is the priority level of the cluster user occupying the reverse traffic channel, set the channel preemption processing flag of the cluster group of the base station subsystem to idle; otherwise, set the channel preemption processing flag of the cluster group of the base station subsystem and the channel The occupied flag is set to free.

After the base station subsystem described in step B2 forwards the reverse call request to the cluster service center, the method further includes:

After the base station subsystem sends a reverse call request message to the trunking service center, it judges whether it has neither received the confirmation message from the trunking service center nor the reverse call rejection message from the trunking center within the time threshold; The channel preemption processing flag of the subsystem cluster group is set to idle; otherwise, no processing is performed.

Before the base station subsystem described in step B2 processes the first reverse call request sent by the cluster user, the method further includes:

The base station subsystem judges whether the channel preemption processing flag of the base station subsystem cluster group is idle, and if it is idle, then executes step B2, updates the base station subsystem cluster group information, and sets the flag as occupied; if it is occupied, then Finish.

Before the cluster service center described in step B3 processes the first reverse call request message received, the method further includes:

The cluster service center judges whether the cluster group channel occupancy flag of the cluster service center and the cluster group channel preemption processing flag of the cluster service center are idle; Set the preemption processing flag to occupied, then perform step B3, update the cluster group information of the cluster service center, and set the cluster service center cluster group channel preemption processing flag to idle after the processing is completed; if the cluster service center cluster group channel preemption processing flag To seize, respond to the base station subsystem with a reverse call reject message.

The trunking service center is the upper-level control center of the base station subsystem in the digital cellular trunking system.

The method further comprises after step C:

C. The cluster user occupying the reverse service channel ends the reverse communication, sends a reverse call release request message to the base station subsystem to which it belongs, and the message is forwarded to the cluster service center through the base station subsystem;

D. The trunking service center updates the trunking group channel information of the trunking service center, and periodically broadcasts a message that the reverse traffic channel is idle to the base station subsystem under its jurisdiction;

E. The base station subsystem periodically broadcasts a message that the reverse traffic channel is idle to the cluster users belonging to the base station subsystem.

Before the trunking service center described in step D periodically broadcasts a message that the reverse traffic channel is idle to the base station subsystem, the method further includes:

The cluster service center sets the cluster group channel occupancy flag of the cluster service center as idle.

Before the base station subsystem described in step E periodically broadcasts a message that the reverse traffic channel is idle to the cluster users belonging to the base station subsystem, the method further includes:

The base station subsystem sets the cluster group channel preemption processing flag of the base station subsystem as idle.

Under the basic principle of first-come-first-served for cluster users, the method provided by the present invention enables high-priority cluster users who send reverse preemption requests later to receive priority services, that is, after the TSC forcibly interrupts the reverse call of the current cluster users, Immediately connect the high-priority cluster user requesting the reverse call to the reverse traffic channel to perform the reverse call, so this method ensures the fast access of the high-priority cluster user when preempting the reverse traffic channel. When the first-come-first-served cluster users are implemented, both BSS and TSC only accept the reverse preemption request sent by the first cluster user in the preemption process, and the BSS immediately sends the BSS range to the BSS through the forward channel after accepting the message. The cluster users in the cluster group broadcast the reverse traffic channel occupation message, and the TSC immediately broadcasts the reverse traffic channel occupation message on the forward channel to all BSSs within the TSC range after receiving the first reverse preemption request. Cluster users with a lower priority than the cluster user currently in the reverse conversation and equal to the cluster user currently in the reverse conversation are prohibited from sending a reverse conversation request after receiving the occupation message. Therefore, this method reduces the load on BSS and TSC or dispatcher.

Description of drawings

Fig. 1 is a flow chart of the reverse traffic channel preemption performed by the trunking users of the present invention.

Fig. 2 is a flow chart of the reverse traffic channel release performed by the trunking user in the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail by citing the following embodiments and referring to the accompanying drawings.

The invention assigns priority levels to the cluster users in the cluster group, the cluster users save the priority levels of their own cluster users, and the TSC saves the priority levels of all the cluster users in the cluster group.

In the present invention, when the trunking user preempts the reverse service channel, that is, when the reverse traffic channel is idle and the trunking user initiates a reverse call request, the trunking users in the trunking group are not prioritized, but adopt the principle of first-come-first-served Guaranteed to seize the reverse traffic channel for fast access to reverse calls. After the reverse service channel preemption is completed, that is, when the first access cluster user performs a reverse call, the cluster user with a higher priority than the cluster user can also initiate a reverse call request. The reverse call is forcibly interrupted by the TSC, and the TSC allocates the reverse traffic channel to the high-priority trunking user who initiated the reverse call request.

In the present invention, when the reverse service channel is occupied, only the cluster user with a higher priority than the cluster user in the reverse call can initiate a reverse call request, and then the TSC passes through the BSS after processing the reverse call request with high priority each time. The reverse traffic channel occupation message carrying the priority level of the cluster user who initiates the reverse call request is broadcast to the cluster users, so that only the cluster users with higher priority are allowed to send the reverse call request.

The TSC in the present invention is the upper-level control center of the BSS in the digital cellular trunking system, and is not limited to a specific physical entity, for example, it can be integrated in a mobile switching center (MSC).

Hereinafter, the present invention will be described by taking the cluster user as the PTT cluster user as an example.

As shown in Figure 1, Fig. 1 is the flow chart that the trunking user of the present invention carries out reverse traffic channel preemption, assumes that a part of trunking users in this group belongs to BSS 1, such as trunking user k, trunking user m and trunking user n Belong to BSS1, another part of cluster users belong to BSS2, set the priority authority PR1 of cluster user k to be lower than the priority authority PR2 of cluster user m, and the priority authority PR2 of cluster user m is less than the priority authority PR3 of cluster user n, the specific process for:

Steps 100-102, when the reverse traffic channel is idle, the TSC periodically broadcasts a reverse traffic channel idle (Uplink State Ind (free)) message on the forward channel, and the message is sent to the group in the cluster through BSS1 and BSS2 All cluster users;

Steps 103-105, after receiving the Uplink State Ind (free) message, the cluster users in the cluster group send a push-to-talk request (PTT setup request) message to preempt the reverse traffic channel, and the PTT setup request message carries The priority of users in this cluster;

Steps 106-108, when BSS1 receives the first PTT setup request message, assuming it is the PTT setup request message sent by cluster user k, judge whether the BSS1 cluster group channel preemption processing flag is true, if the BSS1 cluster group channel If the preemption processing flag is not true, it means that BSS1 has no reverse preemption request being processed. Set the BSS1 cluster group channel preemption processing flag to true, save the priority level of cluster user k, and forward the reverse call of cluster user k to TSC The request (PTTuplink request) message discards subsequent PTTsetup request messages sent by other cluster users belonging to BSS1 in the cluster group, such as discarding the PTT setup request message sent by cluster user m and the PTT setup request message sent by cluster user n, and at the same time BSS1 periodically broadcasts the reverse service channel occupancy (Uplink State Ind (PR1)) message through the forward channel. The Uplink State Ind (PR1) message carries the priority level of cluster user k, so that cluster users with a priority level lower than cluster user k are prohibited from sending PTT setup request message; if the BSS1 cluster group channel preemption processing flag is true, no PTT setup request message of any cluster user will be processed;

By analogy, BSS2 performs the same processing on the PTT setup request message sent by the cluster user belonging to BSS2;

Steps 109-112, after the TSC receives the first PTT uplink request message, it judges whether the TSC trunking group channel occupancy flag and the TSC trunking group channel preemption processing flag are both true, assuming that the first PTT uplink request message is sent by BSS1 Sent, the TSC trunking group channel occupancy flag and the TSC trunking group channel preemption processing flag are both true, and the PTT uplink request message is processed, and the TSC trunking group channel occupancy flag and the TSC trunking group channel preemption processing flag are set to True, update the TSC cluster group information, that is, convert the reverse traffic channel in the TSC cluster group information from idle to occupied, and record the cluster user information that sent the first PTT uplink request message and save the priority of the cluster user , which saves the information and priority of cluster user k. Return a reverse call request response (PTT uplink ack) message to BSS1. At the same time, TSC broadcasts an Uplink State Ind (PR1) message to BSS1 and BSS2. The Uplink State Ind (PR1) message carries the priority level of cluster user k, and the PTT is processed After the uplink request message, set the TSC cluster group channel preemption processing flag to false; if the TSC trunking group channel preemption processing flag is true, then other BSS will send a PTT uplink request message to the TSC, and the TSC will directly respond to the BSS. To the call rejection (PTT uplink reject) message, the carrying reason value is TSC cluster group channel occupation, if TSC directly responds to the BSS2 with the PTT uplink reject message, for example: when BSS2 receives the PTT uplink reject message sent by TSC, check the reason value, if the cause value is TSC cluster group channel occupation, broadcast an Uplink State Ind (PR1) message carrying cluster user k priority level to the cluster users belonging to BSS2, and then set the BSS2 cluster channel preemption processing flag to false, that is, BSS2 can Receive the PTT setup request message of the high-priority cluster user; if the reason value is not occupied by the TSC cluster group channel, directly set the BSS2 cluster channel preemption processing flag to false, that is, BSS2 can receive the PTT setup request of the high-priority cluster user information;;

Step 113, when BSS1 receives the PTT uplink ack message sent by TSC, update the BSS1 cluster group information, that is, record the information of the cluster user who sent the first PTT uplink request message, and send a PTT setup request to the first one belonging to BSS1 The cluster user k of the message returns a reverse call confirmation (PTT setup confirm) message, and the BSS1 cluster group channel preemption processing flag is set to false, that is, BSS1 can receive the PTT setup request message of the high-priority cluster user;

Step 114, after receiving the PTT setup confirm message, the first cluster user k who belongs to BSS1 to send the PTT setup request message enters the reverse communication state;

Steps 115-117, when BSS1 or BSS2 receives a PTT setup request message sent by a cluster user with a higher priority than cluster user k currently in the reverse conversation, for example: the PTT setup request message of cluster user m is sent to BSS1, BSS1 Set the BSS1 cluster group channel preemption processing flag to true, send the reverse call acquisition request (PTT uplink seizerequest) message of the cluster user m to the TSC, and broadcast the Uplink carrying the priority level of the cluster user m to the cluster users to which it belongs State Ind (PR2) message to prohibit cluster users below and equal to this priority level from sending PTT uplink request messages;

Steps 118 to 120, after the TSC receives the PTT uplink seize request message, it is judged whether the TSC cluster group channel preemption processing flag is true, if not, the TSC sets the flag to true, and sends the current reverse call release to BSS1 ( PTT uplink seize release ind(k)) message, so that the cluster user k belonging to BSS1 interrupts the reverse call, and at the same time broadcast the Uplink State Ind (PR2) message carrying the priority level of cluster user m to each BSS;

Steps 121-122, after receiving the PTT uplink seize release ind(k) message, BSS1 sends a PTT uplink release message to cluster user k, interrupts the reverse call of cluster user k, and sends the current reverse call release confirmation (PTT uplink seize release ack(k)) message;

Step 123, TSC sends a reverse call acquisition confirmation (PTT uplink seize ack) message, so that the cluster user m accesses the reverse traffic channel through BSS1, and the TSC cluster group channel preemption processing flag is set to false, so that the higher priority Level cluster users send PTT setup request message;

Steps 124-125, BSS1 updates BSS1 cluster group information, that is, records the information of cluster user m, such as recording the priority and cell information of cluster user m, sends a PTT setupconfirm message to cluster user m, and preempts the BSS1 cluster group channel The processing flag is set as false, and the cluster user m enters the reverse conversation state.

In the present invention, when the current traffic channel is occupied, it can be executed directly from step 115 .

In this process, BSS1 and BSS2 periodically broadcast an Uplink State Ind message to the terminal, indicating whether the state of the reverse traffic channel is free or busy. When a cluster user receives a broadcast message other than an Uplink State Ind (free), judge whether its own priority level is lower than or equal to the priority level carried in the Uplink State Ind (priority) message, and if so, prohibit sending the PTT setup request message. Until the Uplink State Ind (free) message is received; otherwise, the PTT setup request message can continue to be sent. When the cluster user receives the broadcast Uplink StateInd (free) message, any priority cluster user can send a PTT setup request message.

In this process, after the BSS sends a reverse call request message to the TSC, a timer can be set to time a time threshold, and the BSS judges whether it has neither received a confirmation message from the TSC nor a response from the TSC within the time threshold. To the call rejection message, if it is, the BSS cluster group channel preemption processing flag is set to false; otherwise, the timer is stopped after receiving any one of the messages.

As shown in Fig. 2, Fig. 2 is the flow chart of the release of the reverse traffic channel by the cluster users of the present invention, assuming that a part of the cluster users in the cluster group belong to BSS1, such as cluster user k, cluster user m and cluster user n belong to BSS1, another part of cluster users belong to BSS2, set the priority authority of cluster user k to be lower than that of cluster user m, and the priority authority of cluster user m is less than that of cluster user n, the specific process is as follows:

Steps 200-201, the cluster user occupying the reverse traffic channel for reverse call releases the PTT button to end the reverse call state, and sends a PTT uplink release request message to its BSS1;

Step 202, BSS1 sends the PTT uplink release request message to TSC;

Steps 203-204, TSC updates the cluster group status, that is, converts the reverse service channel occupation in the TSC cluster group information to idle, and deletes the cluster user information occupying the reverse service channel, and broadcasts Uplink State to BSS1 and BSS2 Ind (free) message, TSC cluster group channel occupancy sign is set to false;

Step 205, BSS1 and BSS2 respectively set the BSS1 trunking group channel preemption processing flag and the BSS2 trunking group channel preemption processing flag to false, and broadcast an Uplink State Ind (free) message to the trunking users belonging to BSS1 and BSS2;

Step 206, the reverse traffic channel is in an idle state, and cluster users of any priority level can preempt the reverse traffic channel again after receiving the Uplink State Ind (free) message.

The TSC described in the present invention can also be replaced by a dispatcher.

When the cluster user does not work in the PTT mode, the cluster user can also enter the data communication state through the method for the cluster user to seize the reverse service channel in the present invention.

In the preemption process of the reverse service channel, the present invention does not distinguish the priority of the cluster users in the cluster group, and accesses the cluster users for reverse conversation according to the principle of first-come-first-served, thereby ensuring the time delay of accessing the reverse service channel Minimal; the present invention is still in the preemption process, BSS only processes the first PTT uplinkrequest message, and directly discards subsequent reverse call requests, does not forward subsequent PTT uplink request messages to TSC, and does not send corresponding messages to cluster users The response message ensures the simple and reliable processing of BSS, TSC and cluster users.

In the present invention, during the reverse call process of the current cluster user, the higher priority cluster user can initiate a PTT uplink request message, interrupt the reverse call of the current cluster user, and ensure that the higher priority cluster user immediately accesses the reverse service The channel performs a reverse call, so that high-priority cluster users can be served first.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention. within the scope of protection.

Claims (17)

1, a kind of control method of reverse service channel in group user is characterized in that, this method comprises:

A, for the cluster user in the cluster group priority is set in advance;

B, when reverse traffic channel is vacant, cluster service center makes first cluster user that sends reverse call request take backward channel and communicates;

When reverse traffic channel takies, confirm that the cluster user that self priority is higher than the current cluster user priority that communicates sends reverse call request, after cluster service center receives described reverse call request, the high reverse service channel in group user of priority is communicated.

2, the method for claim 1, it is characterized in that, the step that the high reverse service channel in group user of priority is communicated comprises: the cluster user that this priority is high sends reverse call request, this request is forwarded to cluster service center by affiliated base station sub-system, cluster service center is interrupted the reverse link communication of current cluster user, makes this cluster user take backward channel and communicates;

Confirm among the described step B that the process that self priority is higher than the current cluster user priority that communicates is: cluster user judges whether the priority of self is higher than the current cluster user that communicates, if not, this cluster user forbids sending reverse call request; If determine that then the priority of self is higher than the current cluster user that communicates.

3, the method for claim 1, it is characterized in that, this method further comprises: cluster service center takies message to the reverse traffic channel that the base station sub-system periodic broadcasting carries priority level, and this priority level is the priority level of the high cluster user of the described priority of step B;

Base station sub-system takies message to the reverse traffic channel that affiliated cluster user periodic broadcasting carries priority level, and this priority level is the priority level of the high cluster user of the described priority of step B.

4, the method for claim 1, it is characterized in that, this method further comprises: cluster service center sends the message that discharges current cluster user reverse link communication to base station sub-system, base station sub-system discharges the reverse link communication of current cluster user and returns and confirm to give cluster service center, cluster service center is sent the reverse call request of the high cluster user of the described priority of establishment step B by base station sub-system, and this cluster user inserts reverse traffic channel and carries out reverse link communication.

5, the method for claim 1 is characterized in that, when reverse traffic channel was unoccupied, described step B further comprised:

Cluster user in B1, the cluster group sends reverse call request to affiliated base station sub-system;

B2, base station sub-system are handled the reverse call request of first cluster user that sends reverse call request, and transmit this reverse call request to cluster service center;

B3, cluster service center are handled the reverse call request of first base station sub-system that sends reverse call request message, by this base station sub-system the reverse service channel in group user that sends this reverse call request are communicated.

6, method as claimed in claim 5 is characterized in that, described step B2 further comprises:

Base station sub-system abandons the reverse call request message of the follow-up transmission that receives.

7, method as claimed in claim 5 is characterized in that, described step B2 further comprises:

Base station sub-system takies message to the reverse traffic channel that all cluster user periodic broadcastings that belong to this base station sub-system carry priority level, and this priority level is the current priority level that takies the cluster user of reverse traffic channel.

8, method as claimed in claim 5 is characterized in that, described step B3 further comprises:

Cluster service center is after the base station sub-system that sends first reverse call request message is returned acknowledge message, the reverse traffic channel that carries priority level to all base station sub-system periodic broadcastings of being administered takies message, and this priority level is the current priority level that takies the cluster user of reverse traffic channel;

Cluster service center supervention backward send the base station sub-system of reverse call request to return reverse conversation refuse information;

The base station sub-system that sends first reverse call request message is transmitted to this acknowledge message the cluster user that sends first reverse call request message.

9, method as claimed in claim 8 is characterized in that, carries cause value in the described reverse conversation refuse information, and this cause value is a cluster service center cluster group channel occupancy.

10, method as claimed in claim 9 is characterized in that, this method further comprises:

When base station sub-system receives the affirmation message that cluster service center returns, upgrade base station sub-system cluster group information, this information comprises the idle condition of base station sub-system cluster group and the cluster user information that will oppositely converse;

When the reverse conversation refuse information that base station sub-system receives that cluster service center returns, whether the cause value of judging this message is channel occupancy, if, the reverse traffic channel that carries priority level to the cluster user periodic broadcasting of being administered takies message, this priority level is the priority level that takies the cluster user of reverse traffic channel, this base station sub-system cluster group lchannel preempting is handled sign be changed to the free time; Otherwise, this base station sub-system cluster group lchannel preempting processing sign and channel occupancy sign are changed to the free time.

11, method as claimed in claim 5 is characterized in that, after cluster service center was transmitted this reverse call request, this method further comprised in the described base station sub-system of step B2:

Base station sub-system is judged the affirmation message of whether both not received cluster service center in time threshold after cluster service center sends reverse call request message, do not receive the reverse conversation refuse information of cluster centers yet, if then base station sub-system cluster group lchannel preempting is handled sign and is changed to the free time; Otherwise do not process.

12, method as claimed in claim 5 is characterized in that, before first reverse call request that the described base station sub-system Processing Cluster of step B2 user sends, this method further comprises:

Base station sub-system judges whether this base station sub-system cluster group lchannel preempting is handled sign is idle, if be idle, and execution in step B2 then, renewal base station sub-system cluster group information, and this sign is changed to takies; If for taking, then finish.

13, method as claimed in claim 5 is characterized in that, before the described cluster service center of step B3 was handled first the reverse call request message that receives, this method further comprised:

Cluster service center judges whether cluster service center cluster group channel occupancy sign and cluster service center cluster group lchannel preempting are handled sign is idle, if be idle, cluster service center cluster group channel occupancy sign and cluster service center cluster group lchannel preempting are handled sign to be changed to and to take, execution in step B3 then, upgrade cluster service center cluster group information, after finishing dealing with cluster service center cluster group lchannel preempting is handled sign and be changed to the free time; If cluster service center cluster group lchannel preempting is handled to be masked as and taken, respond oppositely conversation refuse information to base station sub-system.

14, the method for claim 1 is characterized in that, described cluster service center is the upper level control centre of base station sub-system in the digital cellular group system.

15, the method for claim 1 is characterized in that, this method further comprises behind step B:

C, the cluster user that takies reverse traffic channel finish reverse link communication, send oppositely to affiliated base station sub-system that conversation discharges request message, and this message is transmitted to cluster service center by this base station sub-system;

D, cluster service center are upgraded cluster service center cluster group channel information, to the message of the base station sub-system periodic broadcasting reverse traffic channel free time of being administered;

E, base station sub-system are to the message of the cluster user periodic broadcasting reverse traffic channel free time that belongs to this base station sub-system.

16, method as claimed in claim 15 is characterized in that, before the base station sub-system periodic broadcasting message of reverse traffic channel free time, this method further comprises in the described cluster service center of step D:

Cluster service center is changed to the free time with this cluster service center cluster group channel occupancy sign.

17, method as claimed in claim 15 is characterized in that, before the message of the cluster user periodic broadcasting reverse traffic channel free time that belongs to this base station sub-system, this method further comprises in the described base station sub-system of step e:

Base station sub-system is handled sign with this base station sub-system cluster group lchannel preempting and is changed to the free time.

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