CN104936154A - A method for determining and adjusting group business area information - Google Patents

Abstract

The invention discloses a method of determining and adjusting group service area information. The method comprises the following steps that a network side sends a sending indication of a group paging message to base stations corresponding to all the cells included in initial group service area information; the base station which receives the sending indication issues a cluster paging message to the cell and the cluster paging message carries a physical random access channel PRACH resource and indication information of a Preamble code; if a group user which receives the cluster paging message determines to receive an own group service, the Preamble code indicated by the indication information is sent to a PRACH channel indicated by the indication information; after the base station receives the Preamble code, a corresponding group service is determined according to the PRACH channel resource used by the Preamble code and a code word of the Preamble code; the network side updates the group service area information according to a feedback condition of each cell.

Description

A method for determining and adjusting group business area information

technical field

The present application relates to the field of mobile communication technology, in particular to a broadband digital trunking communication system based on TD-LTE technology, and in particular to a method for determining and adjusting group service area information.

Background technique

The broadband digital trunking communication system based on TD-LTE technology can not only support various multimedia services of the TD-LTE mobile communication system itself, but also provide basic trunking call services and trunking multimedia services. Group services (such as group calls, etc.) are typical services in the trunking system, which are jointly participated by multiple users. In order to realize fast call establishment of group services, according to the characteristics of point-to-multipoint services, control plane signaling and user plane data are generally transmitted in the downlink mode by broadcasting, and group users in the idle state can directly Receive control plane signaling and user plane data, thereby speeding up call establishment and service data reception.

Due to the randomness of the location of group users, they may be scattered in different cells of the same base station or different cells of different base stations, and the mobility management devices attached to the terminals are different, and the states (including connected state and idle state) of the terminals are also different. not exactly. The trunking system needs to determine group service area information, and the group service area information determines the group service establishment area. When a group service is initiated, the trunking system notifies all cells included in the information to allocate downlink shared wireless resources according to the group service area information, and broadcasts a paging message for group service establishment, so that each group user joins the group Group business.

The group business establishment area of the traditional trunking system generally adopts a fixed area method, which can determine a fixed group business area for the group by statistically analyzing the regular activity range of each group user in a certain group , and manually configure the determined group service area information in the system. However, in practical applications, this approach is only applicable to scenarios where the distribution of group users is relatively concentrated and the range of activities is relatively fixed, and has certain limitations. If the group users have a relatively large range of activities, such as activities within the entire city of a certain city, using a fixed area method, it is necessary to determine the entire city as the group service establishment area. When the group service is established, the group users may only be distributed in some cells within the entire city, and there are no users in the group in most of the cells. All cells allocate downlink shared radio resources and broadcast group service establishment paging messages, which will undoubtedly cause serious waste of system radio resources and affect resource allocation of other cluster services in the area. Therefore, for cluster application scenarios with relatively large activity range or mobility requirements, a dynamic area method is required.

In LTE technology, the network side allocates a tracking area list for each registered terminal. When the terminal in the idle state of radio resource control (RRC) moves in the cell contained in the tracking area list, in addition to periodic tracking area update, the terminal It is not necessary to initiate the tracking area update process, which can reduce the signaling load of the network. When a service arrives, the network side will page the terminal in the cells included in the tracking area list. The specific implementation method is: during the process of attaching the terminal when it is turned on, the mobility management device attached to the terminal assigns it a tracking area identification list; after the terminal enters the idle state, except for periodic tracking area When the tracking area of the terminal moves, the tracking area update process will not be initiated; when the terminal moves to other tracking areas other than the tracking area indicated by the tracking area identification list, the tracking area update process will occur. During this process, the mobility management device will According to the location of the terminal, re-allocate a tracking area identification list for it. It can be seen that due to the introduction of the tracking area concept, the network side does not know the exact location of the terminal in the RRC idle state.

In the Chinese application "A Method for Determining and Adjusting Group Call Area Information" with the application number 201010100197.8, a method for dynamically determining and adjusting the group call area is mentioned, which specifically includes: the network side records the process of group users attaching The location information reported in the group call area information is formed according to the location information of the group users, and the location information is the identity of the cell where the group users are located. When the group user changes from the connected state to the idle state, the location information of the group user in the group call area information is replaced with the cell included in the tracking area list allocated to it by the network side. Afterwards, if the location information of group users changes, the network side updates the group call area information of the group in real time. In the technical solution of this application, the dynamic group call area is composed of the cells where the group users in the RRC connection state are located and the cells included in the tracking area list where the group users are in the RRC idle state. A group user in the RRC idle state will camp on one of the cells included in the tracking area list where the user resides. In this way, for the group call area determined by using the tracking area list, there will be some cells in which there are no users in the group. If the downlink shared radio resources are still allocated in these cells, it will inevitably cause a serious waste of system radio resources, resulting in The limited wireless resources in the trunking system cannot be reasonably allocated and effectively managed, which affects system performance.

Contents of the invention

This application provides a method for determining and adjusting group service area information. Compared with the prior art, the determined group service area information is more accurate, and can more reasonably allocate and effectively manage the limited wireless network in the trunking system. resources and improve system performance.

The embodiment of this application provides a method for determining and adjusting group business area information, including:

A. Generate initial group service area information according to the location information of all group users in the same group currently recorded on the network side;

B. The network side sends a sending instruction of the group paging message to the base stations corresponding to all the cells included in the initial group service area information;

C. The base station that has received the sending instruction sends a cluster paging message in the cell, and the cluster paging message carries physical random access channel PRACH resources and Preamble code indication information; and records the PRACH resources and Preamble The association between the code and the group business;

D. If the group user receiving the group paging message determines to receive the group service to which he belongs, the Preamble code indicated by the indication information is sent on the PRACH channel indicated by the indication information;

E. After the base station receives the Preamble code, determine the corresponding group service according to the PRACH channel resource used by the Preamble code and the code word of the Preamble code;

F. The network side updates the group service area information according to the feedback from each cell.

Preferably, the location information in step A is the cell ID in the tracking area list of the group user.

Preferably, if the group user is in the RRC connection state, the location information in step A is the cell identity of the cell where the group user is located; if the group user is in the RRC idle state, the location information in step A is the group user The cell ID in the tracking area list of the

Preferably, step C further includes: the base station allocates downlink shared wireless resources for group services in the cell;

Step F further includes: the network side determines the cells that have allocated downlink shared radio resources for the group service and have not fed back the Preamble code, and delete the downlink shared radio resources of these cells for the group service.

Preferably, step F further includes: the network side allocates downlink shared radio resources for the group service in the cell corresponding to the updated group service area information.

From the above technical solutions, it can be seen that the network side receives the group service feedback information sent by the group user, and the feedback information is carried by the designated PRACH resource indicated by the base station and uses the designated Preamble code; Determine and adjust group service area information, and allocate downlink shared radio resources for the group service according to the updated group service area information. The technical solution of the present application can feed back the group call information without the group user entering the RRC connection state, and more accurately determine and adjust the group service area information.

Description of drawings

FIG. 1 is a schematic flowchart of a method for determining and adjusting group service area information provided by an embodiment of the present application.

Detailed ways

A method for determining and adjusting group service area information provided in this application, its basic design concept is: the network side receives group service feedback information, and the feedback information indicates the designated physical random access channel (PRACH) resource through eNode B Carry and use the specified preamble (Preamble); the network side determines and adjusts the group service area information according to the feedback of each cell, and allocates downlink shared wireless resources for the group service according to the updated group service area information . The technical solution of the present application can feed back the group call information without the group user entering the RRC connection state, and more accurately determine and adjust the group service area information.

In order to make the technical principles, features and technical effects of the technical solution of the present application clearer, the technical solution of the present application will be described in detail below in conjunction with specific embodiments.

The flow of the method for determining and adjusting group service area information provided by the embodiment of the present application is shown in Figure 1, including the following steps:

Step 101: Generate initial group service area information according to the location information of all group users in the same group currently recorded by the network side.

Step 102: The network side sends a group paging message sending instruction to the base stations corresponding to all the cells included in the initial group service area information.

Step 103: The base station that has received the sending instruction sends a group paging message in the cell, and records the association between the PRACH resource and the Preamble code and the group service. The group paging message carries indication information of PRACH resource and Preamble code.

Step 104: If the group user receiving the trunking paging message determines to receive the group service to which he belongs, he will send the Preamble code indicated by the indication information on the PRACH channel indicated by the indication information to feed back the presence of the group in the cell. The user receives group services.

Step 105: After receiving the Preamble code, the base station determines the corresponding group service according to the PRACH channel resource used by the Preamble code and the code word of the Preamble code.

Step 106: The network side updates the group service area information according to the feedback from each cell. That is, the cells that have received the Preamble code will continue to be retained in the group service area information, and the cells that have not received the Preamble code will be deleted from the group service area information.

Specifically, the network side uses the location information of all group users in the same group to generate initial group service area information, and the user location information specifies two methods:

The first way is not to distinguish the status information of each user in the group, and the cell identifier in the tracking area list of the group user is used as the location information of the user;

The second way is to distinguish the status information of each user in the group. The cell ID of the cell where the user is located in the RRC connected state is the user's location information, and the cell ID in the tracking area of the RRC idle state user is the user's location information.

Method 1 is simple to implement, but the determination of the group service area is not accurate enough, while method 2 is relatively accurate in determining the group service area, but the implementation is more complicated than method 1. You can choose to use method 1 or method 2 to determine the group service area according to the actual situation.

When a group of users initiates a group service, the network side instructs all cells included in the initial group service area information to send a group paging message and allocate downlink shared radio resources according to the initial group service area information. The eNode B will allocate the PRACH resource and Preamble code used by the group user feedback for the group service, and the specified PRACH resource and the specified Preamble code are associated with the group service. When the eNode B sends the group paging message on the air interface, it carries the specified PRACH resource and the specified Preamble code corresponding to the group service.

After receiving the group paging message, if the group user determines to receive the group service to which he belongs, the group user, according to the specified PRACH channel resource and the specified Preamble code information corresponding to the group service indicated by the eNode B, Use the specified Preamble code to send the Preamble code on the specified PRACH channel resource to feedback that there are users receiving the group service in the cell.

The network side determines and adjusts the actual service area of the group service according to the Preamble code fed back by the user. When the eNode B receives the Preamble code and determines the corresponding group service according to the PRACH channel resource and the Preamble code used by the Preamble code, it indicates that there are cluster users in the cell receiving the group service, and the eNode B will be in the cell Allocate downlink shared radio resources for the group service.

In another embodiment of the present application, the following method may be adopted for allocating downlink shared wireless resources for group services: the network side may form initial group service area information according to the location information of all group users in the same group, and in the initial group The cell where the service area is located sends a group paging message, and at the same time allocates downlink shared wireless resources for the group service in these areas, and then determines the actual service area according to the feedback. For the cell that does not receive the group service, delete the group Services share radio resources in the downlink of these cells.

In another embodiment of the present application, the network side may also form the initial group service area information based on the location information of all group users in the same group, and send a cluster paging message in the cell where the initial group service area is located. The cell receives the feedback of the Preamble code from the user to determine and adjust the group service area, and then allocates downlink shared radio resources for the group service in the cell corresponding to the updated group service area information.

Specific examples are given below. Indication information of PRACH channel resource and Preamble code can be added in the group paging message. The trunking paging message TrunkingPaging message in the embodiment of this application is as follows:

TrunkingPaging message

Among them, the meanings of the cells related to the technical solution of the present application are shown in Table 1:

Table 1

The above descriptions are only preferred embodiments of the application, and are not intended to limit the scope of protection of the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the technical solutions of the application are It should be included within the protection scope of this application.

Claims (5)

1. determine and adjust a method for group service area information, it is characterized in that, comprising:

A, generate original group service area information according to the positional information of all group user in the same group of network side current record;

The transmission instruction of the base station transmission group page message that all communities that B, network side comprise in original group service area information are corresponding;

C, receive described send instruction base station issue clustered paging message in this community, carry the indication information of Physical Random Access Channel PRACH resource and Preamble code in described clustered paging message; And record described PRACH resource and the incidence relation between Preamble code and this group service;

If D, the group user receiving clustered paging message determine the group service received belonging to oneself, then on the PRACH channel indicated by described indication information, send the Preamble code indicated by described indication information;

E, after base station receives Preamble code, the PRACH channel resource used according to this Preamble code and the code word of Preamble code determine corresponding group service;

F, network side, according to the feedback of each community, upgrade group service area information.

2. method according to claim 1, is characterized in that, positional information described in steps A is the cell ID in the tracking area list of group user.

3. method according to claim 1, is characterized in that, if group user is in RRC connection status, positional information described in steps A is the cell ID of this community, group user place; If group user is in RRC idle condition, positional information described in steps A is the cell ID in the tracking area list of this group user.

4. method according to claim 1, is characterized in that, step C comprises further: described base station is that group service allocation of downlink shares Radio Resource in this community;

Step F comprises further: network side is determined, for group service allocation of downlink shares Radio Resource and do not feed back the community of Preamble code, to delete the descending shared Radio Resource of group service in these communities.

5. method according to claim 1, is characterized in that, step F comprises further: network side shares Radio Resource in the community that the group service area information upgraded is corresponding for this group service allocation of downlink.