CN1315337C - Resource allocating method for cellular cluster communication system - Google Patents

Abstract

The present invention relates to a resource allocating method for a cellular cluster communication system, which is used for effective management for service channels to ensure system capacity. The method comprises: a group call is initiated by a user in a group; service channels are allocated by the system for the district of the user; group status messages are respectively broadcast to group users in all districts of the service region of the group; the group users of other districts of the service region of the group demand to participate the group call; service communication channels are respectively allocated for the districts of the group users demanding participation by the system; the group users of the districts use the allocated service channels for communication; group status messages are broadcast for all group users in the districts by the districts with the allocated service communication channels; when all group users in the districts secede from cluster communication, the service channels allocated to the districts are released by the system, and group status messages are broadcast to the group users of the districts by the districts of releasing the service channels. Because the service channels are allocated according to requests, a source utilization rate is high, and the method is favorable for reducing operating costs.

Description

Resource Allocation Method for Cellular Trunking Communication System

technical field

The present invention relates to mobile communication technology, more specifically to a resource allocation method of a cellular trunking communication system, which is used for managing service channels in the cellular trunking communication system.

Background technique

As a dedicated dispatching communication system, the trunking communication system has the characteristics of channel resource sharing, user grouping, multi-level priority control, and large system capacity. A typical application of the trunking service is a group call, which is characterized in that calls are made between members of multiple groups (group members are referred to as group members for short).

The cellular system is a system with large area and wide coverage. Its basic components include Mobile Switching Center (MSC: Mobile Switching Center), Base Station Controller (BSC: Base Station Controller) and Base Transceiver Station (BTS: Base Tranceiver Station) , Each MSC can have multiple BSCs, each BSC can have multiple BTSs, and each BTS can be divided into multiple cells (CELL).

In a cellular trunking communication system, the group service area may be concentrated in a certain cell, or may span multiple cells, multiple base transceiver station (BTS) coverage areas, multiple base station controller (BSC) coverage areas, or even across multiple Each mobile switching center (MSC) coverage area, group members also present different types of distribution. In order to effectively manage traffic channel resources, it is necessary to solve the allocation problem of traffic channel resources that has a great impact on system capacity in the cellular trunking communication system.

The current cluster system resource allocation strategy is only for resource allocation in a single cell, mainly including message cluster, transmission cluster and quasi-transmission cluster.

Message clustering means that after the user presses the push-to-talk key (PTT: Push To Talk), the system assigns a channel to the user. If the user presses the PTT key again within the reserved time, the original channel will continue to be used; if the user does not press the PTT key within the channel reserved time, the system will release the channel.

Transmission trunking means that after the user presses the PTT button, the system allocates a channel for the user, and when the user releases the PTT button, the system immediately releases the channel.

The quasi-transmission cluster is between the message cluster and the transmission cluster, but the channel retention time is shortened (such as 0.5-6 seconds) after the user releases the PTT key.

In the cellular trunking communication system, because the group service area may be concentrated in a certain cell, or may span multiple cells, multiple BTS coverage areas, multiple BSC coverage areas, or even multiple MSCs, the group members also present different types. state distribution. However, the above trunking system resource allocation technology does not solve how to allocate the resources of these cells in the cellular trunking communication system.

Contents of the invention

The object of the present invention is to design a resource allocation method for a cellular trunking communication system, which is used for effectively managing service channels in the cellular trunking communication system to ensure system capacity.

The technical solution for realizing the object of the present invention is as follows: a resource allocation method of a cellular trunking communication system, characterized in that it includes:

A. A user in the group initiates a group call, the system allocates a traffic channel to the cell where the user is located, and the group users in the cell use the assigned traffic channel;

B. The cell where the group user who initiated the group call in the group service area broadcasts the group status message including the group number information and the forward/reverse traffic channel attribute information to the group users in the cell, and other cells broadcast the group status message to the group users in their respective cells Broadcast group status messages including group number information;

C. Group users in other cells under the service area of the group request to join the group call, and the system allocates traffic channels to the cells where the group users requesting to join, and the group users in these cells use the allocated traffic channels;

D. The cell that has allocated the traffic channel broadcasts a group status message including group number information and forward/reverse traffic channel attribute information to all group users in the cell;

E. When all group users in a cell quit the group call, the system releases the traffic channel assigned to the cell, and the cell that released the traffic channel broadcasts group status messages to the group users in the cell.

In the step A, the user initiates a group call by sending a group call establishment request message, and the group call establishment request message contains group number information.

In the step C, the group users in each cell join the group call simultaneously or successively.

In the step C, the group user requesting to join the group call sends a join request to the cell to which it belongs, and the join request includes group number information.

In the step E, when multiple users join the same group call in a cell, any user still uses the traffic channel assigned to the cell before all the users in the group quit.

In the step E, the group user requesting to exit the group call sends an exit request to the cell to which it belongs, and the exit request includes group number information.

In the step E, the broadcasted group status message includes group number information, but does not include traffic channel attribute information.

In the steps B, D, and E, the broadcast group status message is sent periodically.

It also includes that after the group user who initiates the group call exits, the system releases the traffic channel allocated to the cell where the group user is located.

The resource allocation method of the cellular trunking communication system of the present invention is a request allocation method. That is to say, the technical solution of multi-cell group call, and service channels are allocated according to the application. Since service channels are allocated according to applications, the resource utilization rate is high, which is beneficial to reduce operating costs.

Description of drawings

Fig. 1 is a schematic diagram of group call distribution of 4 users of the same group under 3 cells;

FIG. 2 is a flowchart of group call process fragments in the distribution shown in FIG. 1 .

Detailed ways

The resource allocation method in the cellular trunking communication system of the present invention is a method for allocating traffic channel resources according to requests.

When a group call is initiated, the system only allocates traffic channels for the cell where the user who initiates the group call resides, and only broadcasts the group status to other cells where the group members reside. The cell where the user is located allocates a corresponding traffic channel. When no group user in the cell uses the traffic channel allocated to the cell, the system releases the traffic channel allocated to the cell.

Referring to Figure 1, suppose there are 3 cells CELL1-CELL3, these cells can be distributed under different or the same BTS, BSC, MSC, there are 4 mobile stations (users) MS1-MS4 (MS: Mobile Station). Among them, there is group user MS1 under CELL1, group users MS2 and MS3 under CELL2, and group user MS4 under CELL3.

Referring to FIG. 2 , the figure shows fragments of the group call process distributed as shown in FIG. 1 .

(1) Any user in the group, such as MS1, initiates a group call setup request (Group Call Setup), and the group call setup request contains information such as the group number gid;

(2) The system allocates a service channel to the cell CELL1 where the user MS1 who initiated the group call establishment request resides. If there are group users under the cell CELL1, the allocated service channel can be used for push-to-talk;

(3) Cells CELL1-CELL3 where users MS1-MS4 in the group are located respectively broadcast the group status to the group users in the cell through broadcast messages, including CELL1 sending broadcast messages to MS1, CELL2 sending broadcast messages to MS2 and MS3 at the same time, and CELL3 sending broadcast messages to MS2 and MS3. MS4 sends a broadcast message, in which the broadcast message Broadcast sent by CELL1 to MS1 contains the group number gid and forward/reverse traffic channel attribute (f/r-tch) information, etc., and the broadcast sent by CELL2 to MS2, MS3 and CELL3 to MS4 The message Broadcast contains the group number gid information, etc., and these broadcast messages are sent periodically;

(4) MS2 joins the group call, and sends a join request to the cell CELL2 to which it belongs. The join request contains information such as the group number gid, and the user may join the group call without notifying the system;

(5) The system allocates a service channel for the cell CELL2, and MS2 uses the service channel allocated to CELL2 to perform push-to-talk (PTT);

(6) The cell CELL2 that has allocated traffic channel to all group users in this cell simultaneously, comprises MS2, MS3 broadcast group status message, has group number gid and forward reverse/reverse traffic channel attribute ( f/r-tch) information, etc.;

(7) MS3 joins the group call, and sends a join group call request Join to the cell CELL2 to which it belongs. The join request contains information such as the group number gid, and the user does not need to notify the system of joining the group call, because the system has allocated a service channel to CELL2. MS3 uses the traffic channel allocated to CELL2 for push-to-talk (PTT);

(8) MS4 joins the group call, and sends a join group call request Join to the cell CELL3 to which it belongs. The join request contains information such as the group number gid, and the user may join the group call without notifying the system;

(9) The system allocates a service channel for the cell CELL3, and MS4 uses the service channel allocated to CELL3 for push-to-talk (PTT);

(10) The cell CELL3 that has allocated the traffic channel broadcasts the group status message to all group users in the cell, including MS4. At this time, the broadcast message Broadcast has the group number gid and the forward/reverse traffic channel attribute (f/r -tch) information, etc.;

(11) MS2 exits the group call, MS2 sends an exit group call request Exit to the cell CELL2 to which it belongs, and the exit request contains information such as the group number gid, and the user does not need to notify the system when exiting, and MS3 continues to use the service assigned to CELL2 at this time channel for push-to-talk (PTT);

(12) MS4 exits the group call, MS4 sends an exit request Exit to the cell CELL3 to which it belongs, and the exit request contains information such as the group number gid, and the user may exit without notifying the system;

(13) Since the traffic channel assigned to CELL3 has not been used by group users, the system releases the traffic channel assigned to CELL3;

(14) The cell CELL3 after releasing the traffic channel includes MS4 broadcast group status message to the group users in this cell, with information such as group number gid in this broadcast message, but without traffic channel attribute information;

(15) MS3 exits the group call, MS3 sends an exit request Exit to the cell CELL2 to which it belongs, and the exit request contains information such as the group number gid, and the user may exit without notifying the system;

(16) Since the traffic channel assigned to CELL2 has not been used by group users, the system releases the traffic channel assigned to CELL2;

(17) The cell CELL2 after releasing the traffic channel broadcasts a group status message to the group users in the cell, including MS2 and MS3. The broadcast message contains information such as the group number gid, but does not carry traffic channel attribute information.

When the user MS1 who initiates the group call set-up request exits (hangs up), releases the traffic channel assigned to CELL1, and stops the group status announcement in steps 14 and 17 simultaneously.

Fig. 2 only shows the broadcast message when the parameter changes, but actually the broadcast message is sent periodically.

The traffic channel resource allocation method of the cellular trunking communication system of the present invention solves the allocation of group call traffic channel resources in multiple cells through the method of allocation according to application.

The method for allocating service channel resources according to the request of the present invention and the method for allocating channel resources of the trunking system introduced in the background art are two aspects, and there is no contradiction between them, and they can be used in combination.

Claims (9)

1. the resource allocation methods of a honeycomb trunked communication system is characterized in that comprising:

A. a user initiates group calling in the group, and system is the cell allocation Traffic Channel at this user place, and the group user in this sub-district uses the Traffic Channel of being distributed;

B. the group users broadcasting of sub-district in its sub-district of organizing under the service area group user place of initiating group calling comprises the group status message of group number information and preceding/reverse traffic channel attribute information, and other sub-district comprises the group status message of group number information to the group users broadcasting in the sub-district separately;

C. the group user of other sub-district asks to add group calling under this group service area, and system is each distribution service channel of sub-district at the group user place of request adding, and the group user of these sub-districts uses the Traffic Channel of being distributed;

D. the sub-district of having distributed Traffic Channel all group users broadcastings in this sub-district comprise the group status message of group number information and preceding/reverse traffic channel attribute information;

When E. the group of all in sub-district user withdrawed from group calling, system discharged the Traffic Channel of distributing to this sub-district, has discharged the group users broadcasting group status message of the sub-district of Traffic Channel to this sub-district.

2. the resource allocation methods of honeycomb trunked communication system according to claim 1, it is characterized in that: in the described steps A, the user initiates group calling, sets up the request message realization by sending group calling, and described group calling is set up and had group number information in the request message.

3. the resource allocation methods of honeycomb trunked communication system according to claim 1 is characterized in that: among the described step C, group user's while or priority in each sub-district add group calling.

4. the resource allocation methods of honeycomb trunked communication system according to claim 1 is characterized in that: among the described step C, the group user that request adds group calling joins request to its affiliated subdistrict transmission, comprises group number information in joining request.

5. the resource allocation methods of honeycomb trunked communication system according to claim 1, it is characterized in that: in the described step e, when having a plurality of users to add same group calling in the sub-district, wherein arbitrary user still uses the Traffic Channel of distributing to this sub-district before all this group users withdraw from.

6. the resource allocation methods of honeycomb trunked communication system according to claim 1 is characterized in that: in the described step e, the group user that group calling is withdrawed from request withdraws from request to its affiliated subdistrict transmission, withdraws to comprise group number information in the request.

7. the resource allocation methods of honeycomb trunked communication system according to claim 1 is characterized in that: in the described step e, the group status message of broadcasting comprises group number information, does not comprise the Traffic Channel attribute information.

8. the resource allocation methods of honeycomb trunked communication system according to claim 1 is characterized in that: among described step B, D, the E, the group status message of broadcasting is periodically to send.

9. the resource allocation methods of honeycomb trunked communication system according to claim 1 is characterized in that: comprise that also after the group user of initiation group calling withdrawed from, system discharged the Traffic Channel of distributing to sub-district, this group user place.

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