CN1297164C - A method of high-priority user uplink preemption - Google Patents

Abstract

The invention discloses a method for uplink preemption of high-priority users. One or more base station subsystems in charge of a trunking group respectively allocate uplink and downlink group call channels to the trunking group within their own jurisdictions, and the trunking group The speaking party in the system occupies the uplink group call channel assigned by the base station subsystem that governs the talking party. The method includes: A. The listening party initiates an uplink access request message through an uplink idle channel not occupied by the talking party, and the message carries the listening party's Priority level; B. The network side of the trunking system that receives the message determines that the listener has a higher priority than the speaker, releases the uplink group call channel occupied by the speaker, and the listener occupies the uplink group call assigned by the base station subsystem that governs the listener Channel; C. The listener, as the current speaker, speaks through the allocated uplink group call channel, and other users in the cluster group, as listeners, listen through the allocated downlink group call channel.

Description

A method for uplink preemption of high-priority users

technical field

The present invention relates to the technology of preempting uplink conversation in trunking wireless communication system, in particular to a method for uplink preemption of high-priority users.

Background technique

Trunking wireless communication system, hereinafter referred to as trunking system, is a relatively economical and flexible command and dispatch communication system developed in recent years, widely used in government agencies, energy transportation, airport terminals, industrial and mining enterprises, fire police, water conservancy and The military and other units are used to meet the needs of internal communication of each unit.

The most basic service provided by the trunking system is the Voice Group Call Service (VGCS). VGCS allows a user to set up a call to a group of group users belonging to a given service area with the same group ID (ID), said service area consists of several mobile services switching center (MSC) or different MSC The VGCS adopts a half-duplex mode. During a call, all users in a group of users can become speakers, but only one speaker is allowed at any time, and other members of the group are listeners.

Fig. 1 is a schematic diagram of a group call process in the prior art, as shown in Fig. 1: assuming that a group of group users belongs to a base station, a pair of uplink and downlink group call channels are assigned to users in the group when a group call is established, wherein A user as the current speaker speaks through the group transmit mode on the uplink group call channel of the group call channel, and other users in the group as listeners listen to the speaker through the group accept mode on the downlink group call channel of the group call channel speech. The notification message for group call channel configuration is broadcast on the notification channel (NCH).

Users of the cluster system can belong to different cluster groups, and different cluster groups have different priority levels. In a cluster group, in order to enable different users to obtain the following service characteristics at different levels, different priority levels are set for different users in the cluster group:

1. The parameters of the random access process of users with different priority levels in the cluster group are different, such as: retransmission times and retransmission intervals, etc., resulting in different access success rates;

2. When users with different priority levels in the trunking group initiate uplink group call channel access at the same time, the trunking system will prioritize the allocation of uplink group call channels for users with high priority levels according to their priority levels;

3. When the low-priority users in the trunking group speak through the uplink group call channel, the high-priority users can interrupt the speech of the low-priority users and obtain the uplink group call channel to speak.

The first two service features are easy to implement. You only need to set different priority levels for different users in the cluster group, and the cluster system performs corresponding processing procedures according to the priority levels set by users who initiate the uplink access or random access process. , but the third, which is the most useful and important one, is currently more difficult to implement.

Fig. 2 is the flow chart of the method for realizing that high-priority users seize the uplink group call channel in the prior art trunking group, as shown in Fig. 2: the user in the trunking group is provided with the priority level in advance, the priority level and the priority level of each user The cluster group ID is written into the Subscriber Identity Module (SIM) card of the user together, and the network side of the cluster system can set or modify the priority of the user through the air interface, and the concrete steps of the method are:

Step 200, the user presses a push-to-talk (PTT) key to initiate a voice group call request, and the group call request carrying the user's priority level is reported to the trunking system network side through a layer 3 message;

Step 200 can be performed when the group call is established, or when the group call has been established, that is, the trunking system network side has allocated a pair of uplink and downlink group call channels to the group call area of the user group and broadcasts that the uplink group call channel is idle through the NCH (UPLINK FREE) message;

Step 201, when the trunking system network side receives the request, if the request is initiated when the group call is established, the trunking system network side allocates a pair of uplink and downlink group call channels to the group call area of the trunking group where the user is located, and Assign the uplink group call channel to the user; if the request is initiated when the group call has been established, directly assign the uplink group call channel to the user;

After the network side of the trunking system allocates the uplink group call channel to the user, the uplink group call channel is busy (UPLINK BUSY) message is broadcast through the NCH, and the message carries the priority level of the user occupying the uplink group call channel;

Step 202, the user who initiates the voice group call request speaks through the uplink group call channel, and other users in the group monitor the downlink group call channel;

Step 203, when other users in the group want to preempt the uplink channel, judge whether their own priority level is higher than the priority level broadcast by the network side of the trunking system, if yes, go to step 204; otherwise, go to step 206;

Step 204, the user initiates an uplink access preemption request to the trunking system network side through a random access process on the uplink group call channel;

Step 205: After receiving the request, the network side of the trunking system releases the uplink group call channel of the user currently occupying the uplink group call channel, assigns the uplink group call channel to the user who initiates the preemption request, and broadcasts an UPLINK BUSY message through the NCH, the message It carries the priority level of the user who initiates the preemption request, and the user who initiates the preemption request can speak through the uplink group call channel;

Step 206, the user cannot initiate an uplink access preemption request to the trunking system network side through a random access process on the uplink group call channel, and the user currently occupying the uplink group call channel continues to occupy the uplink group call channel.

It can be seen from the above scheme that although the existing technology defines priority levels for different users in the trunking group, it also stipulates that users with high priority in the trunking group can preempt the uplink group call channel, however, under the same base station , when a high-priority user in the trunking group preempts the uplink group call channel, a preemption request is initiated to the trunking system network side through the uplink group call channel where the low-priority user is speaking, that is, the step 204, the trunking system Since the network side is processing the speech of the low-priority user, the received speech will be processed and sent to other users in the trunking group through the downlink group call channel, so the trunking system network side cannot receive and interpret the speech correctly at the same time. Calling out the preemption request signaling initiated by the high-priority users through the same uplink group call channel ultimately fails to realize the process of preempting the uplink group call channel by the high-priority users in the group.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for uplink preemption of high-priority users, which can realize the successful uplink preemption of high-priority users in the group, so as to speak uplink as the speaking party.

A method for uplink preemption of high-priority users. One or more base station subsystems that govern the cluster group allocate uplink and downlink group call channels to the cluster group within their own jurisdictions, and the speaking parties in the cluster group Occupying the uplink group call channel assigned by the base station subsystem that governs the speaker, the method includes:

A. The listening party initiates an uplink access request message through an uplink idle channel not occupied by the speaking party, and the message carries the priority level of the listening party;

B. The network side of the trunking system that receives the message judges that the listener has a higher priority than the speaker. If so, release the uplink group call channel occupied by the speaker, and the listener occupies the uplink group call assigned by the base station subsystem that governs the listener channel, go to step C; otherwise, jump out of this process;

C. The listener, as the current speaker, speaks through the allocated uplink group call channel, and other users in the cluster group, as the listener, listen through the allocated downlink group call channel.

Before step A, the method further includes:

A1. The listener in the trunking group receives the uplink group call channel occupancy message carrying the speaker's priority level broadcast by the trunking system network side, and judges whether its own priority level is higher than the broadcasted speaker's priority level. If so, Execute step A2; otherwise, the listener cannot initiate an uplink access request message, and end this process;

A2. The listener sends an uplink preemption request to the network side of the trunking system through the uplink idle channel not occupied by the speaker;

A3. After receiving the request, the network side of the trunking system sends a response to the request to the listener, and broadcasts an uplink group call channel occupation message carrying the highest priority level in the trunking group;

A4. The listener who receives the response executes step A.

The uplink group call channel occupancy message is broadcast through the notification channel.

If the listening party and the talking party belong to the jurisdiction of the same base station subsystem, the uplink idle channel is a random channel of the base station subsystem governing the listening party;

If the listening party and the speaking party are not under the jurisdiction of the same base station subsystem, the uplink idle channel is an uplink group call channel allocated by the base station subsystem governing the listening party.

Set the uplink group call channel occupancy flag for one or more base station subsystems in charge of the cluster group, and set the uplink group call channel occupancy flag of the base station subsystem in charge of the talking party to determine whether the listening party and the talking party belong to the same base station The process of the subsystem is:

The listener judges whether the uplink group call channel occupancy flag of the base station subsystem to which the listener belongs is set. If yes, the listener and the speaker belong to the same base station subsystem; otherwise, the listener and the speaker do not belong to the same base station subsystem.

The uplink idle channel is a set dedicated group call uplink channel.

The process of the speaking party in the cluster group occupying the uplink group call channel assigned by the base station subsystem that governs the speaking party is:

a. The speaking party initiates an uplink access request message to the trunking system network side through the allocated uplink group call channel, and the message carries the priority level of the speaking party;

b. The network side of the trunking system that receives the message makes the talking party occupy the uplink group call channel allocated by the base station subsystem that governs the talking party.

Before step a, the method further includes:

a1. The speaker sends an uplink access request to the network side of the trunking system;

a2. After receiving the request, the network side of the trunking system sends a response to the request to the talking party, and broadcasts an uplink group call channel occupation message carrying the highest priority level in the trunking group;

a3. The speaker who receives the response executes step a.

The process for the talking party in the trunking group to occupy the uplink group call channel assigned by the base station subsystem that governs the talking party is when the trunking group establishes a group call or when the trunking system network side broadcasts an uplink group call channel idle message ongoing.

It can be seen from the above scheme that when the listener with a higher priority than the speaker initiates uplink preemption, if the speaker and the listener belong to the same base station, the listener does not initiate uplink preemption through the uplink group call channel occupied by the speaker. And the uplink preemption is initiated through the random channel of the base station; if the speaking party and the listening party do not belong to the same base station, because the speaking party does not occupy the uplink group call channel assigned by the base station governing the listening party, but occupies the base station governing the speaking party If the assigned uplink group call channel is not available, the listener initiates uplink preemption through the uplink group call channel assigned by the base station in charge of the listener. In the method provided by the present invention, the uplink preemption request of the listener and the speech of the speaker do not need to share an uplink group call channel to access the network side of the trunking system, so that the network side of the trunking system can correctly receive and demodulate the call sent by the speaker at the same time. The preemption request signaling initiated by the speaking and listening parties finally realizes the process of preempting the uplink group call channel by users with high priority in the group. Therefore, the method can realize that the high-priority users in the group can successfully perform uplink preemption, so as to perform uplink speech as a talking party.

Description of drawings

FIG. 1 is a schematic diagram of a group call process in the prior art.

Fig. 2 is a flow chart of a method for realizing high-priority users preempting an uplink group call channel in a trunking group in the prior art.

Fig. 3 is a flow chart of the group call establishment process in the trunk group of the present invention.

Fig. 4 is a flow chart of the user uplink access process in the cluster group according to the present invention.

Fig. 5 is a flow chart of the uplink preemption process of high-priority users in the cluster group according to the present invention.

FIG. 6 is a schematic diagram of an embodiment of an uplink preemption process of a high-priority user in a cluster group according to the present invention.

Fig. 7 is a schematic diagram of another embodiment of an uplink preemption process of a high-priority user in a cluster group according to the present invention.

Detailed ways

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

When a high-priority user in the trunking group initiates an uplink preemption request, if the user and the user currently occupying the uplink group call channel are under the jurisdiction of the same base station, the uplink preemption request is sent to the trunking system network through the random access channel of the base station side, the uplink group call channel not allocated by the base station is sent to the trunking system network side, so that the trunking system network side can receive the preemption request, and perform the process of preempting the uplink channel for the user who initiated the preemption request; if the user The user who is currently occupying the uplink group call channel is not under the jurisdiction of the same base station. Since the speaking user does not occupy the uplink group call channel allocated by the base station that governs the user that initiated the uplink preemption request, the uplink preemption request will pass through the jurisdiction of the user that initiated the uplink preemption request. The uplink group call channel allocated by the base station is sent to the trunking system network side, so that the trunking system network side can receive the preemption request, and perform the process of preempting the uplink channel for the user who initiated the preemption request.

The present invention sets different priority levels for different users in the same cluster group, and the priority level of each user and the cluster group ID are written into the SIM card of the user together, and the network side of the cluster system can set or modify the user through the air interface. priority level.

The technical solution of the present invention includes three basic processes, one is the group call establishment process in the trunking group, the other is the uplink access process of users in the trunking group, and the third is the uplink preemption of other users in the trunking group process. In the following, three basic processes are respectively described by taking the users in a trunking group belonging to different base station subsystems (BSS) of the same MSC as an example.

(1) The group call establishment process in the trunking group:

As shown in Fig. 3, Fig. 3 is the flow chart of the group call establishment process in the trunking group of the present invention, the user who occupies the uplink group calling channel is set in advance on the BSS in charge of the trunking group in this BSS, and the specific steps are as follows :

Step 300, the user in the cluster group presses the push-to-talk (PTT) key to initiate a voice group call request, and the group call request carrying the user's priority level is reported to the BSS in charge of the user through a layer three message, that is, a CM SERVICEREQEUST message ;

Step 301, when the BSS receives the request, set the identity of the user occupying the uplink group call channel of the BSS in the BSS to true, forward the request to the MSC in charge of the group, and send the request to the group where the user belongs. The group call area allocates a pair of uplink and downlink group call channels, and broadcasts the UPLINK BUSY message through the NCH, which carries the priority level of users occupying the uplink group call channel;

Step 302, the MSC notifies all BSSs in charge of the cluster group of the priority level of users who occupy the uplink group call channel this time through the uplink group call channel occupation message, and all BSSs except the BSS in charge of the user who initiated the group call request received the message , respectively assign a pair of uplink and downlink group call channels to the group call area of the trunk group, respectively set the identity of the user occupying the uplink group call channel in the BSS as false, and broadcast the UPLINK BUSY message through the NCH, the message It carries the priority level of users occupying the uplink group call channel;

Step 303, the user who initiates the voice group call request occupies the uplink group call channel assigned by the BSS that governs the user to speak, and other users in the trunk group monitor the downlink group call channel;

Step 304, the BSS in charge of initiating the voice group call requesting user judges in real time whether the user has finished speaking, that is, judges whether the user has released the PTT key, and if so, executes step 305; otherwise, executes step 306;

Step 305, the BSS in charge of the user who initiated the voice group call request releases the uplink group call channel occupied by the user, and broadcasts the UPLINK FREE message through the NCH, and notifies the MSC of the UPLINK FREE message, and the MSC passes through all the BSSs in charge of the cluster group Broadcast UPLINK FREE message;

Step 306: The BSS in charge of the user who initiated the voice group call request does not release the uplink group call channel occupied by the user who initiated the voice group call request, and other high-priority users in the trunk group need to preempt uplink to speak.

The entire group call establishment process is basically the same as the prior art except that the broadcast UPLINK BUSY message carries the identification of whether the user occupying the uplink group call channel is in the BSS.

(2) User uplink access process in the cluster group:

When the network side of the trunking system broadcasts the UPLINK FREE message, the users in the trunking group can perform the uplink access process, as shown in Figure 4:

Step 400, the user in the trunking group initiates an uplink access request (UPLINKACCESS) to the BSS in charge of the user through a random access process on the uplink group call channel in the allocated pair of uplink and downlink group call channels;

Step 401. After receiving the UPLINK ACCESS, the BSS sends a response (VGCS UPLINK GRANT) to the user after receiving the UPLINK ACCESS, and broadcasts an UPLINK BUSY message through the NCH, which carries the highest priority level in the cluster group. It is used to prevent other users in the cluster group from preempting uplink at this time;

Step 402, the user receiving the VGCS UPLINK GRANT sends a layer 3 message to the BSS, namely TALKER INDICATION, which carries the priority level of the user;

Step 403: After receiving the message, the BSS sets the identity of the user occupying the uplink group call channel in the BSS as true, and broadcasts an UPLINK BUSY message through the NCH, which carries the priority level of the user, and sends the message forwarded to the MSC in charge of the cluster group;

Step 404: The MSC notifies all BSSs in charge of the trunking group of the priority levels of the users who occupy the uplink group call channel through the uplink group call channel occupancy message, except for the BSS in charge of the user who initiates the uplink access request after receiving the message All BSSs set the identity of the users occupying the uplink group call channel in their own BSS as false, and broadcast the UPLINK BUSY message through the NCH, which carries the priority level of the user who will occupy the uplink group call channel;

Step 405, the BSS in charge of the user who initiated the uplink access request starts the group call channel modification process, and allocates an uplink group call channel to the user;

Step 406, the user speaks through the uplink group call channel, and other users in the trunking group make group calls through the downlink group call channel allocated when the group call is established.

The uplink access process of users in the entire trunking group is roughly the same as the existing technical solution, except that the priority level of users occupying the uplink group call channel is carried in the UPLINK BUSY message, and the priority level of users occupying the uplink group call channel is carried in the TALKER INDICATION message. The priority level of the user and the identification of whether the user occupying the uplink group call channel is set on all BSSs in charge of the cluster group or not in this BSS.

(3) Uplink preemption process of other users in the cluster group:

When the trunking system network side does not release the uplink group call channel occupied by the user who initiated the voice group call request, other high-priority users in the trunking group need to preempt the uplink to speak, and the process is shown in Figure 5:

Step 500, the user who wants to initiate uplink preemption judges whether his own priority level is higher than the priority level received from the broadcast, if yes, execute step 501; otherwise, execute step 510;

Step 501, the user judges whether the identity of the user occupying the uplink group call channel owned by the BSS governing the user in the BSS is true, if yes, execute step 502; otherwise, execute step 503;

The process of judging in step 501 may be that the user sends a request to inquire about the status of the identification to the BSS in charge of the user, and the BSS returns a message about the status of the identification, and the user judges according to the returned message;

Step 502, the user initiates UPLINK ACCESS to the BSS governing the user through a random access process on a random channel;

Step 503, the user initiates an UPLINK ACCESS to the BSS in charge of the conversation through the random access process on the uplink group call channel assigned by the BSS in charge of the user;

Step 504, the BSS that receives the UPLINK ACCESS sends a VGCSUPLINK GRANT to the user, releases the uplink group call channel occupied by the user who is currently talking, and sets the identity of the user occupying the uplink group call channel that it has in this BSS to be false. NCH broadcasts UPLINK BUSY message, which carries the highest priority level in the cluster group to prevent other users in the cluster group from preempting uplink at this time;

After the BSS receives the UPLINK ACCESS, it can first determine whether the priority level carried by the message is higher than the priority level of the user occupying the group call channel, if yes, continue to execute the following process; otherwise, jump out of this process;

Step 505, the user sends a layer 3 message, namely TALKER INDICATION, to the BSS in charge of the user, and the message carries the priority level of the user;

Step 506: After receiving the message, the BSS sets the identity of the user occupying the uplink group call channel in the BSS as true, and broadcasts an UPLINK BUSY message through the NCH, which carries the priority level of the user, and sends the message forwarded to the MSC in charge of the cluster group;

Step 507, the MSC notifies all the BSSs in charge of the trunking group of the priority level of users who occupy the uplink group call channel through the uplink group call channel occupancy message, and all BSSs receiving the message broadcast the UPLINK BUSY message through the NCH, the message It carries the priority level of users who want to occupy the uplink group call channel;

Step 508, the BSS in charge of the user who initiated the uplink access request starts the group call channel modification process, and allocates an uplink group call channel to the user;

Step 509, the user speaks through the uplink group call channel, and other users in the trunking group make group calls through the downlink group call channel allocated when the group call is established;

Step 510, the user cannot initiate an uplink access request to the trunking system network side, and the currently talking user continues to occupy the uplink group call channel.

When the priority level of the user who wants to initiate an uplink preemption request is lower than the priority level in the trunk group received from the broadcast, the uplink preemption process cannot be initiated, and the mobile station used by the user can indicate to the user through the man-machine interface that the uplink is blocked at this time. Occupied by high-priority users in the cluster group.

As shown in Figure 6, Figure 6 is a schematic diagram of an embodiment of the uplink preemption process of high-priority users in the cluster group of the present invention: assuming that the current speaker and the listener in the cluster group are under the same base station, the current speaker Speak through the uplink group call channel, and the current listener monitors the speaker's speech through the pre-allocated downlink group call channel through the trunking system. The channel sends the uplink preemption request to the base station, and the base station implements the uplink preemption process of the listener who initiates the uplink preemption request and enables the user to perform uplink speech.

As shown in FIG. 7, FIG. 7 is a schematic diagram of another embodiment of the uplink preemption process of high-priority users in the cluster group of the present invention: assuming that the current talking party and the listening party in the cluster group are under different base stations, the current The speaker speaks through the uplink group call channel, and the current listener monitors the speaker's speech through the pre-assigned downlink group call channel through the trunking system. The uplink group call channel assigned by the base station that preempts the user sends the uplink preemption request to the base station, and the base station implements the uplink preemption process of the listener who initiates the uplink preemption request and enables the user to perform uplink speech.

Since the uplink preemption request of the listener and the speech of the talker do not share the same uplink group call channel, the network side of the trunking system can correctly receive and demodulate the speech sent by the talker and the preemption request signaling initiated by the listener at the same time. Finally, the process of preempting the uplink group call channel by users with high priority in the group is realized.

The present invention enables the high-priority listener to initiate a group call preemption request through the uplink idle channel not occupied by the speaker, such as: the unoccupied uplink idle channel is a preset dedicated channel for initiating the group call preemption request.

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 protection of the present invention. scope.

Claims (9)

1, the method for the other uplink rob of user of a kind of high priority, it is characterized in that, one or more base station sub-systems of administration cluster group are given this cluster set of dispense up-downgoing group-calling channel respectively in the compass of competency of self, speaker in this cluster group takies the uplink group cal channel of the base station sub-system distribution of administration speaker, and this method comprises:

A, obedient square tube are crossed the unappropriated up idle channel of speaker and are initiated up access request message, and this message has been carried obedient side's priority level;

B, the group system network side that receives this message judge that the priority level of obedient side is higher than speaker, if, discharge the uplink group cal channel that speaker takies, obedient side takies the uplink group cal channel of the base station sub-system distribution of the obedient side of administration, execution in step C; Otherwise, jump out this flow process;

Talk by the uplink group cal channel that distributes as current speaker in C, obedient side, other users in this cluster group monitor as the descending group-calling channel of obedient square tube over-allocation.

2, the method for claim 1, it is characterized in that, before steps A, this method further comprises: the obedient side in A1, the cluster group receives the uplink group cal channel occupancy message of having carried the speaker priority level of group system network side broadcasting, whether the priority level of judging self is higher than the speaker priority level of being broadcasted, if, execution in step A2; Otherwise obedient side can not initiate up access request message, process ends;

A2, obedient square tube are crossed the unappropriated up idle channel of speaker and are sent the uplink rob request for the group system network side;

After A3, group system network side receive this request, send this request responding for obedient side, and other uplink group cal channel occupancy message of limit priority in this cluster group has been carried in broadcasting;

A4, receive obedient side's execution in step A of this response.

3, method as claimed in claim 2 is characterized in that, described uplink group cal channel occupancy message is broadcasted by notification channel.

4, method as claimed in claim 1 or 2 is characterized in that, if obedient side belongs to same base station sub-system administration with speaker, described up idle channel is the accidental channel of the base station sub-system of the obedient side of administration;

If obedient side does not belong to same base station sub-system administration, the uplink group cal channel that described up idle channel distributes for the base station sub-system of the obedient side of administration with speaker.

5, method as claimed in claim 4, it is characterized in that, uplink group cal channel occupancy sign is set for one or more base station sub-systems of administration cluster group, and will administer the uplink group cal channel occupancy sign set of the base station sub-system of speaker, judge that obedient side and the process whether speaker belongs to same base station sub-system are:

Obedient side judges under the obedient side that the uplink group cal channel occupancy of base station sub-system identifies whether set, if then obedient side and speaker belong to same base station sub-system; Otherwise then obedient side and speaker do not belong to same base station sub-system.

6, the method for claim 1 is characterized in that, the special-purpose group calling up channel of described up idle channel for being provided with.

7, the method for claim 1 is characterized in that, the process that the speaker in described this cluster group takies the uplink group cal channel of the base station sub-system distribution of administering speaker is:

The uplink group cal channel that a, speaker are passed through to be distributed is initiated up access request message to the group system network side, and this message has been carried the priority level of speaker;

The uplink group cal channel that the base station sub-system that b, the group system network side that receives this message make speaker take the administration speaker is distributed.

8, method as claimed in claim 7 is characterized in that, before step a, this method further comprises:

A1, speaker send up access request for the group system network side;

After a2, group system network side receive this request, send this request responding, and other uplink group cal channel occupancy message of limit priority in this cluster group has been carried in broadcasting to speaker;

A3, receive the speaker execution in step a of this response.

9, method as claimed in claim 7, it is characterized in that the process of the uplink group cal channel that described base station sub-system of taking the administration speaker for speaker in this cluster group is distributed is carried out when this cluster is set up upright group calling or during group system network side broadcast upstream group-calling channel idle message.

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