WO2006131047A1

WO2006131047A1 - A method and system for real-time locating the group calling/multicast mobile station

Info

Publication number: WO2006131047A1
Application number: PCT/CN2006/000995
Authority: WO
Inventors: Zhili Xia
Original assignee: Shanghai Huawei Technologies Co., Ltd.
Priority date: 2005-06-10
Filing date: 2006-05-16
Publication date: 2006-12-14
Also published as: CN1882161A; CN100459794C

Abstract

A method and system for real-time locating the group calling/multicast mobile station are disclosed. The method and the system are suitable for trunking communication system based on public network. The method includes: dividing SDCCH channel into multiple sub-channels and assigning these sub-channels for group calling/multicast groups, and sending the description information of the assigned sub-channel to the mobile station; each mobile station determines its report location in the sub-channel, and reports access burst (AB) carrying its information in the report location periodically; the network side receives AB on the sub-channels assigned for group calling/multicast groups, and locates the mobile station based on the location of AB and the carrying information of the mobile station. The system includes channel dividing and assignment process unit, locating information reporting unit and locating unit. With the invention, the network side could locate the mobile station in a designated group calling/multicast group at any moment during the group calling/multicast of the trunking communication system based on public network, thus it is convenient to control and schedule the trunking communication system.

Description

Method and system for real-time positioning of group call/multicast mobile station

Technical field

The present invention relates to a communication method of a trunking communication system based on a public communication network, and more particularly to a method and system for real-time positioning of a group call/multicast mobile station in a group call/multicast process of a trunking communication system. Background of the invention

The trunking communication system is a more economical and flexible command and dispatch communication system developed in recent years. It is widely used in government agencies, energy transportation, airport terminals, industrial and mining enterprises, fire police, water conservancy and military units to meet each The need for internal communication of the unit.

Initially, the trunking communication system uses a cluster private network to build a networking. However, because each group independently builds a cluster private network, the technology and test-making between groups are not uniform, so it is easy to form a separate construction situation, resulting in low frequency utilization efficiency, network construction costs, and high network maintenance costs. Recently, with the development of trunking communication technology from analog to digital, the network construction of cluster communication network has shown a trend of development from independent cluster private network construction to cluster public network construction. In particular, since the global mobile communication system (GSM) technology system has been developed relatively well, and there are a wide range of public networks in the country and around the world, the development of cluster communication systems based on GSM communication networks has received much attention from the industry. .

At present, Europe has developed a set of international standard GSM-R for railway mobile communication. It uses GSM communication network as the service bearer and can complete basic group call (VGCS) / multicast (VBS) and other trunking communication services. Basic voice dispatch call function. The group call is a call that multiple mobile stations participate at the same time, wherein the speaker mobile station can receive and send information, the listener mobile station can only receive information, and the speaker mobile station can change; the multicast is a special type The group call, special in its speaker mobile station can not be changed. However, due to the different user groups of the public network and the private cluster network, the requirements for the business are also very different. The GSM communication network used to be mainly for the public, and related services were more suitable for public services. Some special requirements for the cluster communication system could not be met.

In the trunking communication system, the mobile station (MS) in the group call/multicast needs to be located in real time, that is, the network side needs to know the real-time cell-level location information of each mobile station in the specified group call/multicast. For example, it is known in which cell the group call/multicast mobile station is located and from the base station of the cell; the specific location parameters include the cell identity of the mobile station and the distance from the base station in the cell.

However, in the existing GSM system, only a single mobile station can be located. The positioning method is as follows: The mobile station reports the location information by occupying the uplink resource, and the network side locates the mobile station according to the reported location information. . Since the group call/multicast is a group of mobile stations, if the existing positioning method utilizes a large amount of uplink resources, the existing GSM-based trunking communication system cannot implement the group call. /Multicast mobile station for real-time positioning. Summary of the invention

In view of this, the main object of the present invention is to provide a method for real-time positioning of a group call/multicast mobile station, so that the network communication system based on the public network can be specified at any time during the group call/multicast process. The mobile station in the group call/multicast group is positioned to facilitate the command and dispatch of the cluster communication system.

Another object of the present invention is to provide a system for real-time positioning of a group call/multicast mobile station, so that the cluster communication system based on the public network can call the designated group at any time during the group call/multicast process. The multicast station in the multicast group is positioned to facilitate the command and dispatch of the trunking communication system.

A method for real-time positioning of a group call/multicast mobile station, which is suitable for public network-based The cluster communication system, the method divides the SDCCH channel into multiple SDCCH subchannels; assigns the divided SDCCH subchannels to the group call/multicast, and sends the description information of the allocated SDCCH subchannels to the group call/group All mobile stations in the broadcast; the respective mobile stations learn the allocated SDCCH subchannel according to the description information of the SDCCH subchannel, and determine that the location of the access burst sequence AB is reported in the allocated SDCCH subchannel, The reporting location periodically reports the AB carrying its own information; the network side receives the AB on the SDCCH subchannel allocated for the group call/multicast, and locates the mobile station according to the location of the AB and the mobile station information carried by the AB. .

Preferably, the specific method for dividing the SDCCH subchannel is: dividing the SDCCH channel according to a division manner in which each of the SDCCH subchannels occupies one burst sequence BURST in N 2x51 multiframes, where N is a positive integer .

Preferably, the specific method for allocating the divided SDCCH subchannels for the group call/multicast is: one group call/multicast correspondingly assigning one or more SDCCH subchannels.

Preferably, the method for the mobile station to determine that it reports the AB position in the allocated SDCCH subchannel is:

Determining whether the cell frame number in the SDCCH subchannel meets the following formula:

(FN) Mode ( Kmax_idxNx 102 ) ) Integer ( Nx 102 ) = Num — id where FN is the cell frame number, and Kmaxjd is the maximum number of mobile stations in the group call/multicast group that the network side sends to the mobile station. The Num_id is the number of the mobile station in the group call/multicast; the Num_id is pre-configured and stored in the mobile station; the N is pre-configured and stored in the mobile station or sent to the mobile station by the network side. ;

If the cell frame number conforms to the above formula, AB is reported at the cell frame number position.

Preferably, the length of the AB is 8 bits, and the information of the mobile station carried by the AB is the intra-group number information of the mobile station, specifically: a value obtained by modulo Num-id to 256.

Preferably, the network side according to the location of the received AB and the mobile station letter carried by the AB The method for locating the mobile station is: verifying the AB according to the location of the receiving AB and the mobile station information carried by the AB. After the verification succeeds, determining, by receiving the position of the AB, receiving the cell identifier of the AB and 4. The distance between the mobile station of the AB and the base station of the cell completes the positioning of the mobile station.

Preferably, the verification method is: calculating a value of ((FN) Mode ( Kmax - idxNxl02 ) ) Mode ( 256 ), where FN is a cell frame number corresponding to the received AB; determining the movement carried by the received AB Whether the station information is equal to the value of ((FN) Mode ( Kmax_idxN l02 ) ) Mode ( 256 ). If they are equal, the verification is successful, otherwise the verification fails.

Preferably, the specific method for sending the description information of the allocated SDCCH subchannel to all mobile stations in the group call/multicast is: the network side notification of the cell involved in the group call/multicast The group call/multicast identifier and the description information of the SDCCH subchannel allocated for the group call/multicast are periodically sent on the channel, and the mobile station in the cell obtains the group call/multicast by listening to the notification channel. And identifying the SDCCH subchannel description information, and determining, by the group call/multicast identifier, whether the mobile station is subordinate to the group call/multicast, and accepting the SDCCH subchannel description information; otherwise, no processing is performed.

Preferably, the specific method for sending the description information of the allocated SDCCH subchannel to all mobile stations in the group call/multicast is: the network side is in the downlink of the cell involved in the group call/multicast The group of call/multicast identifiers and the description information of the SDCCH subchannels allocated for the group call/multicast are periodically sent on the fast associated control channel, and the mobile station in the cell monitors the downlink fast on-channel control The channel obtains the description information of the group call/multicast identifier and the SDCCH subchannel, and determines whether the mobile station is subordinate to the group call/multicast by using the group call/multicast identifier, and accepts the SDCCH subchannel description information; Otherwise, no processing is done.

Preferably, the public network is a mobile communication network based on a global mobile communication system. Preferably, the network side mainly includes a base station subsystem BSS, a mobile switching center MSC, a group call/multicast control register GCR, and a scheduling system; and the network side is a group call/multicast distribution station. For the divided SDCCH subchannels, the specific steps of sending the description information of the allocated SDCCH subchannels to all mobile stations in the group call/multicast are:

a. The scheduling system sends the group call/multicast identifier that needs real-time positioning to the MSC and the maximum number of mobile stations in the group of the group/multicast;

b. The MSC sends the group call/multicast identifier to the GCR.

The GCR queries the correspondence between the cell list of the group call/multicast mobile station and the group call/multicast identifier according to the received group call/multicast identifier; and obtains the cell list corresponding to the group call/multicast identifier. Returning the cell list information to the MSC;

The MSC queries the pre-set BSS and the cell identifier according to the received cell list information, obtains the BSS involved in the cell list, and the cell identifier corresponding to the BSS, and sends the group call/multicast identifier to the BSS. , the maximum number of mobile stations in the group, and the cell identifier corresponding to the BSS;

After receiving the group call/multicast identifier, the maximum number of mobile stations in the group, and the cell identifier corresponding to the BSS, the BSS allocates the divided SDCCH subchannel for the group call/multicast, and specifies the cell identifier in the group. The notification message carrying the description information of the allocated SDCCH subchannel is sent in each of the cells, and the group call/multicast identifier and the maximum number of mobile stations in the group are further carried in the notification message.

Preferably, the network side receives the AB on the SDCCH subchannel allocated for the group call/multicast, and the specific steps of locating the mobile station according to the location of the AB and the mobile station information carried by the AB are:

A. The BSS receives the AB reported by the mobile station on the SDCCH subchannel allocated for the group call/multicast, the maximum number of mobile stations in the group using the group call/multicast, the description information of the SDCCH subchannel, and the received AB. The corresponding location is used to check the information carried by the AB. If the verification succeeds, the identifier of the cell base station that receives the AB and the distance between the mobile station reporting the AB and the cell base station are determined by using the AB, and the group call is performed. /multicast identity, the move The intra-group number, the identifier of the cell base station, and the distance between the mobile station and the cell base station are reported to the MSC, and step B is performed; if the verification fails, the AB is not processed;

B. The MSC forwards the group call/multicast identifier, the intra-group number of the mobile station, the identifier of the cell base station, and the distance between the mobile station and the cell base station to the scheduling system;

C. The scheduling system according to the group call/multicast identifier, the intra-group number of the mobile station, the identifier of the cell base station, and the distance between the mobile station and the cell base station to the group call/multicast mobile station Positioning.

A system for real-time positioning of a group call/multicast mobile station is set in a cluster communication system of a public network, including:

a channel division and allocation processing unit, disposed on a network side of the trunking communication system, configured to divide the SDCCH channel into channel division units of multiple SDCCH subchannels, and allocate the divided SDCCH subchannels for group call/multicast, and And sending the description information of the allocated SDCCH subchannel to the mobile station in the group call/multicast;

a positioning information reporting unit, configured to be located on the mobile station of the trunking communication system, configured to learn the allocated SDCCH subchannel according to the description information of the SDCCH subchannel received by the mobile station, and determine that the mobile station is in the allocated SDCCH sub The location of the AB is reported in the channel, and the AB carrying the mobile station information is periodically reported in the reporting position;

a positioning unit, disposed on a network side of the trunking communication system, configured to receive an AB on an SDCCH subchannel allocated for the group call/multicast, and the mobile station according to the location of the AB and the mobile station information carried by the AB Positioning.

Preferably, the channel division and allocation processing unit delivers the allocated SDCCH subchannel to the mobile station in the group call/multicast by using the network side on the notification channel of the group call/multicast involved cell. Descriptive information.

Preferably, the channel division and allocation processing unit sends, by the network side, a mobile station in the group call/multicast on a downlink fast associated control channel of the group call/multicast involved cell. The description information of the allocated SDCCH sub-channel is issued.

Preferably, the positioning unit further includes a check unit: configured to check the AB according to the location of the receiving AB and the information carried by the AB.

Preferably, the public network is a mobile communication network based on a global mobile communication system. Preferably, the channel division and allocation processing unit is disposed in a BSS of the trunking communication system; the positioning unit further includes a first positioning unit and a second positioning unit; the first positioning unit is disposed in the BSS, The identifier of the cell base station that receives the AB and the distance between the mobile station that reports the AB and the cell base station are determined by using the AB; the second positioning unit is disposed in the scheduling system of the trunking communication system, and according to the mobile station information reported by the AB And identifying, by the identifier of the cell base station, and the distance between the mobile station reporting the AB and the base station of the cell, the mobile station.

The invention has the following beneficial effects:

1. Since the present invention divides the SDCCH channel of the global mobile communication system into a plurality of SDCCH subchannels and allocates them to multiple group call/multicast, the mobile station of the group call/multicast passes the AB cycle in real time on the allocated SDCCH subchannel. The local information is reported on the ground, and the network side locates the mobile station according to the reported AB, so that real-time positioning of the group call/multicast mobile station can be realized, which facilitates the command and dispatch communication of the cluster communication system during group call/multicast.

2. Since the mobile station in the present invention uses the access burst sequence (AB, Access Burst) to report information, and the time taken by an AB is very short, generally only 0.577 ms, so the listener moves the station to leave the group call when reporting information. The time of the multicast channel is very short, the reporting speed is fast, and the normal communication of the mobile station is not affected, and has no effect on the basic services of the group call/multicast.

3. The present invention does not occupy the uplink of the group call/multicast channel, and has no influence on the communication between the mobile station and the network side, thereby avoiding waste of link resources.

4. Since the present invention determines the distance to which the mobile station belongs and the mobile station to the base station according to the AB reported by the mobile station in real time, the small group/multicast mobile station can be implemented. Real-time location-level positioning, that is, it can be known in which cell the mobile station in the group call/multicast is currently located, and how far away from the base station of the cell, and the positioning accuracy is high.

5. The BSS can send a notification message through the notification channel and the FACCH channel, and the mobile station in the idle state acquires the notification message by monitoring the notification channel, and the mobile station in the call mode can obtain the notification message by listening to the FACCH channel, so the present invention The mobile station in the group in the idle state can be located, and the mobile station in the call mode can be located. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic diagram of a physical channel mapped by a SDCCH channel in a GSM system; FIG. 2 is a flowchart of real-time positioning of a group call mobile station according to an embodiment of the present invention; FIG. 3 is a schematic structural diagram of a system according to the present invention. . Mode for carrying out the invention

The method for carrying out the invention will be further described below in conjunction with the drawings and specific embodiments.

The present invention is applicable to a group call/multicast process of a trunked wireless communication system based on a public network. The embodiment of the present invention describes the present invention by taking a cluster wireless communication system based on a GSM public network as an example.

In this embodiment, an independent dedicated control channel (SDCCH) in the GSM communication system is designated as a dedicated control channel for group call/multicast mobile station ^=艮 location information, all movements within a group call/multicast The station shares a SDCCH channel. Since the SDCCH channel does not need to establish a link in advance, the mobile station only needs to report the AB to the fixed point, and the time used is extremely short, generally only a few ms, so it does not affect the normal communication of the listener's mobile station.

In the GSM communication system, the SDCCH is a dedicated signaling channel, and the physical channel mapped by the SDCCH is a plurality of time slots in the multiframe. The invention uses a multiframe as a unit physical letter The multiframe can be of different types. In this embodiment, 2x51 multiframe is used as a unit physical channel, 102 frames are used in each 2x51 multiframe, and 8 SDCCHs are mapped in each 2x51 multiframe. Each SDCCH is mapped on 12 time slots, which respectively occupy 12 burst sequences (BURST).

Figure 1 is a schematic diagram of the physical channel mapped by the SDCCH channel in the GSM system. As shown in Figure 1, the 2x51 multiframe sequence is transmitted in a round-robin fashion, including 102 frames in each 2x51 multiframe, for example, 102 in 2x51 multiframes with frame numbers "0" and "N-1". Frame, one SDCCH channel occupies 12 BURSTs in a 2x51 multiframe.

There may be multiple group calls/multicasts in the communication system. In order to enable different group call/multicast mobile stations to use the SDCCH channel to report positioning information without interference, the SDCCH channel of the existing GSM system needs to be further subdivided. Divided into different SDCCH subchannels, assigned to different group calls/multicasts. The specific division of the subchannels can be performed according to the requirements of the operator.

The following are specific methods for dividing the SDCCH subchannel for group call/multicast:

According to the difference in the number of BURSTs occupied by the SDCCH subchannel, multiple types of SDCCH channels can be divided:

If each SDCCH subchannel occupies 12 BURSTs in a 2x51 multiframe, it is divided according to a 2x51 multiframe period, and one SDCCH channel can be divided into one subchannel;

If each SDCCH subchannel occupies 6 BURSTs in a 2x51 multiframe, it is divided according to a 2x51 complex frame period, and one SDCCH channel can be divided into 2 subchannels;

If each SDCCH subchannel occupies 4 BURSTs in a 2x51 multiframe, it is divided according to a 2x51 complex frame period, and one SDCCH channel can be divided into three subchannels;

If each SDCCH subchannel occupies 3 BURSTs in a 2x51 multiframe, it is divided according to a 2x51 complex frame period, and one SDCCH channel can be divided into 4 subchannels;

If each SDCCH subchannel occupies 2 BURSTs in a 2x51 multiframe, it is divided according to a 2x51 multiframe period, and one SDCCH channel can be divided into 6 subchannels; If each SDCCH subchannel occupies 1 BURST in a 2x51 multiframe, it is divided according to a 2x51 multiframe period, and one SDCCH channel can be divided into 12 subchannels;

If each SDCCH subchannel occupies one BURST in two 2x51 multiframes, it is divided according to two 2x51 multiframe periods, one SDCCH channel can be divided into 24 subchannels; and so on.

If each SDCCH subchannel occupies 1 BURST in N 2x51 multiframes, it is divided according to N 2x51 multiframe periods, and one SDCCH channel can be divided into Nxl2 subchannels; Nxl2 subchannels are respectively represented as SDCCH_subN(k) , k is 0, 1 , 2, k, k + 1, , Νχ 12-1.

In the specific implementation process, the type of SDCCH used in the above-mentioned type is determined according to the number of groups of group call/multicast services in GSM. In this embodiment, each SDCCH subchannel adopts a subchannel allocation mode in which one BURST is occupied by N 2x51 multiframes, where N is a positive integer. In this manner, each SDCCH is divided into a plurality of subchannels, and can support multiple groups. . For example: If the SDCCH subchannel is divided by 2x2x51 multiframe period (about 941 milliseconds), one SDCCH channel can be divided into 24 SDCCH subchannels, which can support 24 groups.

The foregoing is a specific method for the BSS to divide the SDCCH subchannel for the group call/multicast mobile station. After being divided, the divided SDCCH subchannel information is separately set and stored in the BSS system and the mobile station, for example, the SDCCH subchannel of this embodiment. The information is SDCCH— subN ( k ) , k is 0, 1, 2, k, k + 1 , , NX12-L

Since the real-time positioning of the group call and the real-time positioning of the multicast are the same for the real-time positioning, the present invention is described by taking the group call as an example in the following embodiments.

In order to provide the cell information, the active area information of the supported group call mobile station is set in the group call control register (GCR) on the network side, and the active area is the approximate active range of all the mobile stations of the group call, and the active area information may be a group call. The list of cells to which the mobile station belongs may also be a list of location areas, where the group call identifier (GID) is used as an index. 2 is a flow chart of real-time positioning of a group call mobile station according to an embodiment of the present invention. As shown in Figure 2, the process includes:

Step 201: The scheduling system on the network side sends a group call mobile station location request application message VGCS_Subscrber_Position-Req (GID, Kmaxjd) to the mobile switching center (MSC), where the message includes the GID of the group call that needs to be real-time located. And the maximum number of mobile stations (Kmax_id) in the group.

Step 202: After receiving the VGCS-Subscrber_Position-Req (GID, Kmax_id) message, the MSC sends a group call area request message VGCS_Area-Req (GID) to the GCR, where the message carries the GID.

Step 203: After receiving the VGCS-Area-Req (GID) message, the GCR queries the pre-set cell list and searches for the approximate activity range information of the mobile station in the group. The activity range information is the group. a cell list of a cell to which the mobile station belongs in the call group, the Cell list reflects the area of the group call; and then returns a group call mobile station location result message VGCS_Area_Result (Cell list) to the MSC, where the message includes Cell list.

Step 204: After receiving the VGCS-Area-Result (Cell list) message, the MSC queries the corresponding relationship between the cell and the BSS configured by the Cell list, and learns all the BSSs involved in the group call area. Each of the BSSs in the group call area sends a group call mobile station location query message VGCS_Subscrber_Position_Req (GID, Cell_list_bss, Kmaxjd), and the message includes: a group call GID, the group call area is in the Cell list information Cell_list_bss in the BSS, the maximum number of mobile stations Kmax_id in the group of the group call.

Step 205: After receiving the VGCS_Subscrber_Position-Req (GID, Cell_list_bss, Kmax_id) message, each BSS in the group call area follows the stored SDCCH subchannel information SDCCH. —subN ( k ) , k is 0, 1 , 2, k, k + 1 , , Νχ12-1 , assigning one or more SDCCH subchannels to the group call whose group identity is GID, for the group Call the positioning of the mobile station; The correspondence between the GID, Kmax_id and the SDCCH subchannel is recorded.

In a specific implementation, multiple SDCCH subchannels may be allocated to one group call. In this embodiment, only one SDCCH subchannel is allocated to one group call as an example. H is set as the SDCCH subchannel allocated by the current group call is SDCCH_subN(i), and each N of the SDCCH subchannels The 2x51 multiframe period can be used to determine the mobile station positioning information in a group. Which SDCCH subchannel is specifically allocated, that is, the specific value of the i may be in various manners, for example, may be in the order of GID, or may be valued according to a specific law, and the specific value is not discussed in this patent. The list, but to ensure that the assigned SDCCH subchannel is not assigned to other group calls.

Step 206: The BSS periodically sends a notification message Notification (GID, Kmax_id, SDCCH_subN(i)) on the notification channel of each cell listed in the Cell_list_bss received by the BSS, where The group call GID, the SDCCH subchannel description information SDCCH_subN(i) assigned to the group call, and the maximum number of mobile stations Kmax_id of the group. The SDCCH subchannel description information includes a parameter i or includes parameters N and i. In order to support the positioning of the group call or multicast mobile station in the call mode, Notification (GID, Kmax_id, SDCCH_subN(i)) may also be in the downlink fast associated control channel (FACCH) of each cell traffic channel. ) Send on the channel.

The present invention pre-stores GID list information of each group call subordinate to the subscription mobile station in the mobile station or in the SIM card, and the intra-group number information Num_id of the subordinate group of the subscription mobile station; a mobile station may belong to a different group. Call, and within each group call, there is a Num_id corresponding to the mobile station.

Step 207: On the mobile station side, the mobile station in the idle mode in the cell receives the notification message by monitoring the notification channel, where the mobile station receives the notification message by listening to the FACCH channel in the call mode; the mobile station is receiving After each notification message, it is determined whether the GID carried in the notification message is subordinate to the group call GID list stored by the mobile station, such as If yes, the mobile station decodes the SDCCH subchannel description information SDCCH_subN(i) in the notification message, and accepts that the SDCCH subchannel allocated by the network side for the group call identified as GID is SDCCH_subN(i), and simultaneously decodes the notification. The maximum number of mobile stations in the message Kmax_id; if not, the mobile station does not belong to the group call of the GID identifier, so the mobile station does not process.

Step 208: The mobile station periodically reports the access pulse (AB, ACCESS BURST) at the location determined on the SDCCH-subN(i) subchannel, and the interval of the transmission interval is Kmax_idxNxl02; the AB described in this embodiment has 8 BIT, which carries the The intra-group number information of the mobile station, the value of 8BIT is (Num_id) Mode (256); the maximum binary number that can be represented by 8 bits is 11111111, so if the 8 bits are used to record the listener mobile station group The internal ID can only represent up to 256 ID numbers. For a group call/multicast with more than 256 mobile stations in the group, the listener mobile station whose ID number is greater than 256 cannot be represented in the group. Therefore, in this embodiment, listening The intra-group ID information of the mobile station is expressed as: MODE [ID/256] „ If 6 bits are used to record the ID information of the listener mobile station group in AB, then only 64 ID numbers can be identified, so AB in this case The ID information of the carried mobile station group can be MODE [ID/64].

The position at which the mobile station transmits AB on the SDCCH-subN(i) subchannel conforms to the following formula (1):

( (FN) Mode ( Kmax — idxNx 102 ) ) Integer (N l02) = Num — id

In the above formula (1): FN is the unified frame number of the current mobile station's home cell. Since one frame corresponds to one AB, the FN is also the location where the current mobile station transmits AB; N indicates that the SDCCH subchannel is divided into Nx2x51 complex. The frame, N is carried in the SDCCH_subN(i) subchannel description in the above notification message; (FN) Mode (Kmax_idxN l02) indicates that the modulus of Kmax_idxNxl02 is taken for FN, ((FN) Mode (Kmax_idxNx102)) Integer (Nxl02) indicates (FN) Mode ( Kmax_idxN l02 ) divided by (Nxl02) After taking an integer.

In a specific implementation, the mobile station sequentially determines whether the cell frame number in the SDCCH subchannel conforms to the above formula (1), and if yes, determines that the cell frame number is the location frame of the mobile station in the SDCCH_subN(i) subchannel. No., reporting AB at the cell frame number position; otherwise, determining that the cell frame number is not the location frame number of the mobile station reporting the AB in the SDCCH_subN(i) subchannel.

Step 209: The BSS monitors AB in real time on the subchannel SDCCH_subN(i) of the group call that is identified as GID, determines the frame number FN of the frame corresponding to the received AB, and decodes the 8BIT value of the AB.

Step 210: The BSS calculates a value of ((FN) Mode ( Kmax — idxNxl02 ) ) Mode ( 256 ) according to the determined FN, the N in the subchannel description information SDCCH — subN ( i ), and the Kmax — id corresponding to the GID. And determining whether the 8BIT value of the AB is equal to the value of ((FN) Mode (Kmax_ idxNx 102)) Mode (256). If they are equal, the BSS determines that the AB is the location information reported by the group call mobile station identified as the GID. Go to step 210; No, ij, determine that AB is an interference signal, ignore the AB, and end the process.

Step 211: The BSS determines the distance information TA between the mobile station and the base station by using the AB according to the existing determining manner, and reports the group mobile station in-position message VGCS_Subscrber_Position (GID, Num_id, Cell_id) to the MSC. (TA), wherein the group call identifier GID, the group mobile station identifier Num_id of the group call, that is, the 8BIT value of the AB, the identifier Cell_id of the cell where the group mobile station is located, and the mobile station and Distance information TA of the base station. The Cell_id may be determined according to an identifier of a base station that receives the AB.

Step 212: After receiving the VGCS-Subscrber_Location (GID, Num_id, Cell_id, TA) message, the MSC forwards the VGCS-Subscrber JPosition (GID, Num_id, Cell_id, TA) message to the scheduling system. .

Step 213: The scheduling system receives the VGCS-Subscrber_ Position (GID, Num_id, 5

After the Cell_id, TA) message, the cell in which the mobile station identified as Num_id is located and the distance of the mobile station from the cell base station in the group call identified as GID can be known, so that the mobile station can be located. . Since the BSS monitors the AB on the subchannel SDCCH_subN(i) in real time, the mobile station in the group call can be located in real time. If the scheduling system supports display, the scheduling manager may be prompted to call the mobile station in place or record the mobile station in-position information in the group call mobile station location log.

According to the above process, all mobile stations in the group call can be located in real time and displayed in the scheduling system.

Based on the above method, the structural diagram of the positioning system of the present invention is shown in FIG. 3:

The positioning system can perform real-time positioning on the group call/multicast mobile station, and is set in the trunking communication system of the public network. The public network can be a mobile communication network based on the global mobile communication system, and the positioning system includes:

a channel division and allocation processing unit, configured in the BSS of the network side of the trunking communication system, for dividing the SDCCH channel into channel division units of multiple SDCCH subchannels, and allocating the divided SDCCH subchannels for group call/multicast And sending the description information of the allocated SDCCH subchannel to the mobile station in the group call/multicast. The channel division and allocation processing unit may send, by using the network side, the description information of the allocated SDCCH subchannel to the mobile station in the group call/multicast on the notification channel of the group call/multicast involved cell. And the description information of the allocated SDCCH subchannel is sent to the mobile station in the group call/multicast by the network side on the downlink fast associated control channel of the group call/multicast related cell.

a positioning information reporting unit, configured on the MS of the trunking communication system, configured to learn the allocated SDCCH subchannel according to the description information of the SDCCH subchannel received by the mobile station, and determine that the mobile station is in the allocated SDCCH subchannel In the position of the upper report AB, the AB carrying the mobile station information is periodically reported at the reporting position. 00995 a positioning unit, disposed on a network side of the trunking communication system, configured to be in the group call

The multicast is received on the SDCCH subchannel of the multicast, and the mobile station is located according to the location of the AB and the mobile station information carried by the AB. The locating unit further includes a check unit, a first locating unit, and a second locating unit. The check unit is disposed in the BSS, and is configured to check the AB according to the location of the receiving AB and the information carried by the AB. The first positioning unit is disposed in the BSS, configured to determine, by using AB, an identifier of a cell base station that receives the AB, and a distance between the mobile station that reports the AB and the cell base station; and the second positioning unit is configured to perform cluster communication. In the scheduling system of the system, the mobile station is located according to the mobile station information reported by the AB, the identifier of the cell base station, and the distance between the mobile station reporting the AB and the cell base station.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope of the present invention. All should be covered by the scope of the present invention.

Claims

Claim

A method for real-time positioning of a group call/multicast mobile station, which is applicable to a cluster communication system based on a public network, characterized in that the SDCCH channel is divided into multiple SDCCH subchannels; group call/multicast allocation Deriving the SDCCH subchannel, and transmitting the description information of the allocated SDCCH subchannel to all mobile stations in the group of call/multicast; the each mobile station knows the allocated according to the description information of the SDCCH subchannel. The SDCCH subchannel is determined to report the location of the access burst sequence AB in the allocated SDCCH subchannel, and the AB carrying the self information is periodically reported in the reporting position; the network side is allocated for the group call/multicast. The AB is received on the SDCCH subchannel, and the mobile station is located according to the location of the AB and the mobile station information carried by the AB.

The method according to claim 1, wherein the specific method for dividing the SDCCH subchannel is:

The SDCCH channel is divided according to a division manner in which each of the SDCCH subchannels occupies one burst sequence BURST in N 2x51 multiframes, where N is a positive integer.

The method according to claim 2, wherein the specific method for allocating the divided SDCCH subchannels for group call/multicast is: assigning one or more SDCCH subchannels to one group call/multicast correspondingly .

The method according to claim 2, wherein the mobile station determines that the method for reporting the location of the AB in the allocated SDCCH subchannel is:

(FN) Mode ( Kmax_idxNx 102 ) ) Integer ( N l02 ) = Num_id where FN is the cell frame number, and Kmax_id is the maximum number of mobile stations in the group call/multicast group that the network side sends to the mobile station. Num_id is the number of the mobile station in the group call/multicast; the Num_id is pre-configured and stored in the mobile station; the N is pre-configured and stored in Delivered to the mobile station in the mobile station or by the network side;

The method according to claim 4, wherein the length of the AB is 8 bits, and the information of the mobile station carried by the AB is the intra-group number information of the mobile station, specifically: Num_id modulo 256 The value obtained afterwards.

The method according to claim 5, wherein the network side locates the mobile station according to the location of the received AB and the mobile station information carried by the AB: according to the location of the receiving AB and the carrying of the AB The mobile station information is verified by the mobile station information. After the verification is successful, the location of the mobile station is determined by determining the cell identity of the AB and the distance between the mobile station reporting the AB and the cell base station by receiving the location of the AB.

The method according to claim 6, wherein the verification method is: calculating a value of ((FN) Mode ( Kmax_idxNxl02 ) ) Mode ( 256 ), where

FN is the cell frame number corresponding to the received AB; determining whether the received mobile station information carried by the AB is equal to the value of ((FN) Mode ( Kmax_idxNx 102 ) ) Mode ( 256 ), if equal, the verification is successful, otherwise The verification failed.

The method according to claim 1, wherein the specific method of sending the description information of the allocated SDCCH subchannel to all mobile stations in the group call/multicast is:

The network side periodically sends the group call/multicast identifier and the description information of the SDCCH subchannel allocated for the group call/multicast on the notification channel of the group call/multicast involved cell, where the cell is in the cell The mobile station obtains the group call/multicast identifier and the SDCCH subchannel description information by listening to the notification channel, and determines whether the mobile station is subordinate to the group call/multicast through the group call/multicast identifier, and the accepting station SDCCH subchannel description information; otherwise, no processing.

9. The method according to claim 1, wherein said assigning The specific method for sending the description information of the SDCCH subchannel to all the mobile stations in the group call/multicast is:

The network side periodically sends the group call/multicast identifier and the description information of the SDCCH subchannel allocated for the group call/multicast on the downlink fast associated control channel of the group call/multicast involved cell, The mobile station in the cell obtains the description information of the group call/multicast identifier and the SDCCH subchannel by listening to the downlink fast associated control channel, and determines whether the mobile station belongs to the group by using the group call/multicast identifier. Multicast, yes, accepts the SDCCH subchannel description information; otherwise, it does not process.

The method according to any one of claims 1 to 9, wherein the public network is a mobile communication network based on a global mobile communication system.

The method according to claim 10, wherein the network side mainly comprises a base station subsystem BSS, a mobile switching center MSC, a group call/multicast control register GCR, and a scheduling system; The specific steps of sending the description information of the allocated SDCCH subchannel to all the mobile stations in the group call/multicast are as follows:

b. The MSC sends the group call/multicast identifier to the GCR.

The MSC queries the pre-set BSS and the cell identifier according to the received cell list information, obtains the BSS involved in the cell list, and the cell identifier corresponding to the BSS, and sends the group call/multicast identifier to the BSS. , the maximum number of mobile stations in the group, and the cell identifier corresponding to the BSS; After receiving the group call/multicast identifier, the maximum number of mobile stations in the group, and the cell identifier corresponding to the BSS, the BSS allocates the divided SDCCH subchannel for the group call/multicast, and specifies the cell identifier in the group. The notification message carrying the description information of the allocated SDCCH subchannel is sent in each of the cells, and the group call/multicast identifier and the maximum number of mobile stations in the group are further carried in the notification message.

The method according to claim 11, wherein the network side receives the AB on the SDCCH subchannel allocated for the group call/multicast, according to the location of the AB and the mobile station information carried by the AB. The specific steps of the mobile station for positioning are:

A. The BSS receives the AB reported by the mobile station on the SDCCH subchannel allocated for the group call/multicast, the maximum number of mobile stations in the group using the group call/multicast, the description information of the SDCCH subchannel, and the received AB. The corresponding location is used to check the information carried by the AB. If the verification succeeds, the identifier of the cell base station that receives the AB and the distance between the mobile station reporting the AB and the cell base station are determined by using the AB, and the group call is performed. The multicast/identity identifier, the intra-group number of the mobile station, the identifier of the cell base station, and the distance between the mobile station and the cell base station are reported to the MSC, and step B is performed; if the verification fails, the AB is not processed;

C> the scheduling system according to the group call/multicast identifier, the intra-group number of the mobile station, the identifier of the cell base station, and the distance between the mobile station and the cell base station to the group call/multicast mobile station Positioning.

13. A system for real-time positioning of a group call/multicast mobile station, which is set in a trunking communication system of a public network, and is characterized in that:

a channel division and allocation processing unit, disposed on a network side of the trunking communication system, configured to divide the SDCCH channel into channel division units of multiple SDCCH subchannels, and allocate the divided SDCCH subchannels for group call/multicast, and Description of the assigned SDCCH subchannel The information is sent to the mobile station in the group call/multicast;

The system according to claim 13, wherein the channel division and allocation processing unit sends the group call/multicast to the group on the notification channel of the group call/multicast involved cell by the network side. The mobile station in the downlink delivers the description information of the allocated SDCCH subchannel.

The system according to claim 13, wherein the channel division and allocation processing unit passes the network side to the group on a downlink fast associated control channel of the group call/multicast involved cell. The mobile station in the call/multicast delivers the description information of the allocated SDCCH subchannel.

The system according to any one of claims 13 to 15, wherein the positioning unit further comprises a checking unit: configured to perform the AB according to the location of the receiving AB and the information carried by the AB check.

The system according to any one of claims 13 to 15, wherein the public network is a mobile communication network based on a global mobile communication system.

The method according to claim 17, wherein the channel division and allocation processing unit is disposed in a BSS of the trunking communication system; the positioning unit further includes a first positioning unit and a second positioning unit; The first positioning unit is disposed in the BSS, and is configured to determine, by using the AB, an identifier of the cell base station that receives the AB, and a distance between the mobile station that reports the AB and the cell base station; and the second positioning unit is configured to be configured in the trunking communication system. System The mobile station is located according to the mobile station information reported by the AB, the identifier of the cell base station, and the distance between the mobile station reporting the AB and the cell base station.