CN1852492B - Method and system for establishing group call - Google Patents

Abstract

The invention discloses a method for establishing a group call, which comprises the steps of: when a user initiates a group call on the network side of the trunking communication system of the GSM system, index the location of the user according to the group call identification carried in the group call initiation message sent by the user; and according to the other user identifiers in the group where the user belongs to the index, page other users in the group in turn to the group call initiated by the user, and complete the establishment of the group call. Correspondingly, the present invention also proposes a system for establishing a group call. The invention can save NCH channel resources and improve the operation quality of group call communication services in the trunking communication system of GSM standard.

Description

Method and system for establishing group call

technical field

The invention relates to the technical field of trunking communication, in particular to a method and system for establishing a group call.

Background technique

The digital trunking communication network is a new type of mobile communication system emerging at the end of the 20th century. In addition to the personal mobile communication services that public mobile communication networks (such as GSM and CDMA networks, etc.) can provide, it can also realize arbitrary communication between individuals and groups. .

Among them, GT800 trunking communication technology is a new professional digital trunking communication technology based on time division multiple access. It combines cellular communication technology, and through the optimization and combination of TDMA and TD-SCDMA communication technology, it can provide professional trunking users with high performance, Large-capacity trunking communication service; and GT800 trunking communication system has the advantages of stable system performance, strong sustainable development capability, fast connection performance and high-speed data service.

At present, in the GT800 trunking communication system, when a user initiates a group call service, the network side needs to send a group call notification message on the notification channel (NCH, Notification Channel) of all cells. The group call notification message sent includes the group call notification message. Identification (group call ID); other users in the corresponding group monitor the NCH channel in the cell where they are, once they find the group call ID and their own Subscriber Identity Module (SIM) contained in the group call notification message sent on the NCH channel , the pre-written group call ID in the Subscriber Identity Module) is the same, and immediately responds to the group call notification message and joins the group call initiated by the above-mentioned user, thereby completing the establishment of the group call.

Since the NCH channel resources are very limited in the current GT800 trunking communication system, generally one cell may be assigned one NCH channel. In this way, after a large number of group calls are initiated at the same time, the network side needs to periodically send different group call notification messages on each NCH channel. Since the NCH channel resources are relatively tight, when multiple group call notification messages need to be sent, it is necessary Each group call notification message needs to be queued and sent on the NCH channel. Therefore, when the number of group call notification messages to be sent by the network side is too large, it may cause the delay or loss of the group call notification message sending, which will definitely affect the The running quality of the group call communication service.

Contents of the invention

The technical problem to be solved by the present invention is to propose a group call establishment method and system thereof, so as to save NCH channel resources and improve the operation quality of group call communication services in the trunking communication system of the GSM standard.

In order to solve the above problems, the technical scheme proposed by the present invention is as follows:

A method for setting up a group call, comprising the steps of:

A. When the network side of the trunking communication system of the GSM system initiates a group call, according to the group call identifier carried in the group call initiation message sent by the user, the group where the user is located is indexed; and

B. Paging other users in the group to the group call initiated by the user in turn according to the other user identifiers in the group where the user is indexed, and completing the establishment of the group call;

C. In the established group call, the receiving user implements mobility management through cell reselection processing, specifically including:

c1. The receiving user locates a new cell, and sends a reselection notification message to the network side in the new cell;

c2. After receiving the reselection notification message, the network side judges whether there is a group call channel in the new cell, and if so, assigns the receiving user to the group call channel in the new cell; otherwise, the group call channel in the new cell The new cell allocates a group call channel, and assigns the receiving user to the allocated group call channel.

Preferably, the group call identifier is a group call number.

Preferably, the user identifier is a user number.

Preferably, said step B specifically includes the steps of:

B1, the network side of the trunking communication system of the GSM standard obtains the International Mobile Subscriber Identity code corresponding to each user according to the other user number information in the group where the user is located; and

B2. Initiate paging for other users in the group in turn according to the acquired IMSI of each user;

B3. After receiving the paging message sent by the network side, each other user in the group feeds back a paging response message to the network side;

B4, the network side, for each user who feeds back the paging response message, judges whether a group call channel has been assigned for the user who feeds back the paging response message, if so, assign the user to the assigned group call channel; otherwise The user is assigned a group call channel, and the user is assigned to the assigned group call channel.

Preferably, in the established group call, the speaking user implements mobility management through cell handover processing.

Preferably, the process for the receiving user to implement mobility management through cell reselection further includes:

c3. The network side performs downlink detection in the original cell where the receiving user is located to determine whether there is still a receiving user in the original cell, and if so, retain the group call channel in the original cell; otherwise delete the original cell Group call channel in the cell.

Preferably, the trunking communication system of the GSM standard is a GT800 trunking communication system.

A group call establishment system, comprising a network side and a terminal device of a trunked communication system of the GSM standard, the network side comprising:

The indexing unit is used to index the group where the user belongs to according to the group call identifier carried in the group call initiation message sent by the user when the network side of the trunking communication system of the GSM system initiates a group call;

a paging unit, configured to sequentially page other users in the group to the group call initiated by the user according to the other user identifiers in the group where the user is indexed by the indexing unit, to complete the establishment of the group call;

The terminal equipment includes:

The cell positioning unit is used to locate a new cell when the user acts as a receiving user after the group call is established successfully;

A reselection notification sending unit, configured to send a reselection notification message to the network side in the new cell located by the cell positioning unit;

The network side also includes:

A first judging unit, configured to judge whether there is a group call channel in the new cell according to the reselection notification message sent by the reselection notification sending unit;

A first channel assignment unit, configured to assign the receiving user to a group call channel in the new cell when the judgment result of the first judging unit is yes;

a channel allocation unit, configured to allocate a group call channel to the new cell when the determination result of the first determination unit is negative; and

The second channel assignment unit is configured to assign the receiving user to the group call channel assigned by the channel assignment unit.

Preferably, the paging unit specifically includes:

The obtaining subunit is used to obtain the International Mobile Subscriber Identity code corresponding to each user according to other user identifiers in the group where the user is indexed by the indexing unit;

The paging subunit is used to sequentially initiate paging for other users in the group according to the International Mobile Subscriber Identity codes of the users obtained by the obtaining subunit;

A paging response receiving subunit, configured to receive a paging response message fed back to the network side by other users in the group after receiving the paging message initiated by the paging subunit;

The judging subunit is configured to, for each user who feeds back a paging response message to the paging response receiving subunit, judge whether a group call channel has been assigned to the user who feeds back a paging response message;

The first channel assignment subunit is used to assign the user to the assigned group call channel when the judgment result of the judging subunit is yes;

a channel allocation subunit, configured to allocate a group call channel to the user when the determination result of the determination subunit is negative; and

The second channel assignment subunit is configured to assign the user to the group call channel assigned by the channel assignment subunit.

Preferably, the network side also includes:

a downlink detection unit, configured to perform downlink detection in the original cell where the receiving user is located;

The second judging unit is configured to judge whether there is still an answering user in the original cell according to the detection result of the downlink detection unit;

A channel deletion unit, configured to delete the group call channel in the original cell when the judgment result of the second judging unit is negative.

The beneficial effect that the present invention can reach is as follows:

The solution of the present invention proposes that when a user initiates a group call on the network side of a GSM-based trunking communication system (such as a GT800 trunking communication system), the network side indexes the group call ID (group call ID) carried in the group call initiation message sent by the user. The group where the user is in; and according to other user identifications (user IDs) in the group where the user is in the index, the other users in the group are paged in turn in the group call initiated by the user, thereby Complete the establishment of the group call. Through the solution of the present invention, it can be realized that the trunking communication system of the GSM system (such as the GT800 trunking communication system) does not need to occupy the NCH channel resources during the group call establishment process, thereby saving the NCH channel resources and improving the group communication system in the GSM system. At the same time, group users do not need to monitor the NCH channel in real time, but monitor the paging channel (PCH, PagingChannel) through discontinuous reception (DRX, Discontinuous Reception), thereby saving the battery power of the user terminal.

In addition, based on the solution of the present invention, there is no need to write the group call ID into the SIM card of the group user, so that when the user applies for the group call service, the grouping process at the network side is simpler and more convenient.

Description of drawings

Fig. 1 is the flow chart of the main realization principle of the group call establishment method of the present invention;

Fig. 2 is in the method of the present invention, the network side calls other users in the group into the group call through the paging mode, and sets up the processing flowchart of the group call;

Fig. 3 is the flow chart of the process of realizing mobility management by the receiving user through the cell reselection process in the method of the present invention;

Fig. 4 is a block diagram of the main components of the group call establishment system of the present invention;

Fig. 5 is the concrete structural block diagram of paging unit in the system of the present invention;

FIG. 6 is a structural block diagram of the main components of the network side and the terminal equipment side in order to realize the mobility management problem in the system of the present invention.

Detailed ways

The design idea of the solution of the present invention is: in the trunking communication system of GSM standard (such as the GT800 trunking communication system), realize the technology of setting up group call service in paging mode, so as to save the NCH channel resources in the trunking communication system. That is, in the trunking communication system of the GSM standard, the initiator of the group call adopts the normal group call initiation process (same as the prior art), and the users in other groups will adopt the paging method proposed by the solution of the present invention when joining the group call.

The main realization principle and specific implementation manner of the solution of the present invention will be described in detail below in conjunction with each accompanying drawing.

Please refer to Fig. 1, this figure is the main realization principle flowchart of the group call establishment method of the present invention, and its main realization process is as follows:

Step S10, when the network side of the trunked communication system of the GSM system initiates a group call, according to the group call identification (group call ID) carried in the group call initiation message sent by the user, index the group where the user is located; This initiating process of the call is the same as that of the prior art, and the present invention will not go into details here;

Among them, the most typical example of the trunking communication system of the GSM standard is the GT800 trunking communication system (that is, the GSM 800M trunking communication system);

Step S20, the network side of the trunking communication system of the GSM system pages each other user in the group to the group initiated by the user in turn according to other user identifications (user IDs) in the group where the user is located in the indexed group. call, so as to complete the establishment of the group call, that is, the network side pages each user through the PCH channel according to the identification information (such as number information, etc.) of other users in the group, so that each user can join the group call after receiving the paging message. The initiated group call is in progress.

The group call identifier (group call ID) mentioned in the above step S10 may be, but not limited to, group call number information; meanwhile, the user identifier (user ID) mentioned in the above step S20 may be, but not limited to, user number information.

Please refer to Fig. 2, this figure is that in the method of the present invention, the network side calls other users in the group into the group call through the paging mode, and sets up a processing flowchart of the group call, and its specific implementation process is as follows:

Step S201, the network side of the trunked communication system of the GSM standard obtains the International Mobile Subscriber Identity (IMSI) corresponding to each user according to the other user number information (MSISDN information of each user) in the group where the user is located in the above-mentioned index ;

Step S202, the network side of the trunked communication system of the GSM standard initiates paging for each other user in the group in turn according to the IMSI of each user obtained above;

Step S203, after receiving the paging message from the network side, each other user in the group feeds back a paging response message to the network side;

Step S204, the network side of the trunked communication system of the GSM system judges whether a group call channel has been allocated for the user who feeds back the paging response message for each user who feeds back the paging response message, and if so, executes step S205; otherwise executes step S205. S206;

In step S205, the network side of the trunking communication system of the GSM standard assigns the user to the assigned group call channel;

In step S206, the network side of the trunked communication system of the GSM standard allocates a new group call channel for the user, and assigns the user to the newly allocated group call channel.

An embodiment that realizes the process of setting up a group call according to the principle of the solution of the present invention:

The network side of the GT800 trunking communication system queries the MSISDN number of each user corresponding to the group call through the group call ID, and obtains the IMSI number of each user according to each MSISDN number, and then executes the paging process according to the IMSI number of each user, that is, through The IMSI numbers of the users in the group page each user in the group in turn. After receiving the paging message, each user in the group responds to the paging response message, and the network side allocates a group call channel to the user who responds to the paging response message, and assigns the user to the assigned group call channel; If the channel has been established, users are directly assigned to the assigned group call channel.

The network side connects to the network according to the occupancy of the uplink channel, that is, the uplink channel of the speaker is connected to the downlink channel of each listener in the group.

After the group call is established, it enters the current normal group call uplink occupancy process, that is, the user preempts the uplink channel through the push-to-talk (PTT, Push To Talk) preemption method and speaks.

If the uplink channel is unoccupied for a long time, the network side will actively dismantle the group call and release the group call channel occupied by each user. Each user can exit the group call by hanging up.

After the group call is successfully established, during the subsequent group call communication of each user in the group, both the speaker user and the receiver user may move between different cells, which involves mobility management. Solution, wherein the method of the present invention proposes that in the successfully established group call, the speaking user realizes mobility management through cell handover processing (the specific implementation process is the same as the cell handover processing in the prior art); Optional processing to implement mobility management.

Please refer to Fig. 3, this figure is the processing flow diagram that the answering user realizes mobility management through cell reselection processing in the method of the present invention, and its specific implementation process is as follows:

Step S301, during the group call communication process, the receiving user locates a suitable new cell according to the signal conditions of each neighboring cell;

Step S302, the receiving user sends a reselection notification message to the network side in the located new cell;

Step S303, after receiving the reselection notification message, the network side judges whether there is an established group call channel in the new cell, if yes, executes step S304; otherwise executes step S305;

Step S304, the network side assigns the receiving user to the group call channel in the new cell, and then goes to step S306;

Step S305, the network side allocates a new group call channel for the new cell, and assigns the receiving user to the newly allocated group call channel;

Step S306, the network side performs downlink detection processing in the original cell where the receiving user is located;

Step S307, the network side judges whether there is still an answering user in the original cell according to the above-mentioned downlink detection result, if yes, execute step S308; otherwise, execute step S309;

Step S308, the network side reserves the group call channel in the original cell;

Step S309, the network side deletes the group call channel in the original cell.

The group call establishment method of the present invention realizes the establishment of the group call by sending a paging message on the PCH channel instead of sending a group call notification message on the NCH channel when the group call user scale is relatively small. Location area transmission does not need to be sent across the entire network; in this way, when the number of users is relatively small, only part of the PCH channel resources are needed to realize the establishment of group calls; and for this small-scale group call, sampling is done on the NCH channel To send a group call notification message, it needs to be sent in the whole network, so it will cause a serious waste of NCH channel resources.

Correspondingly, the present invention also proposes a system for establishing a group call. Please refer to FIG. 4 , which is a block diagram of the main components of the group call establishment system of the present invention, wherein the group call establishment system of the present invention includes a trunked communication system network side and terminal equipment of the GSM standard, wherein the trunked communication system network side of the GSM standard includes Index unit 10 and paging unit 20, the effect of each part is as follows:

The indexing unit 10 is used to index the group where the user is located according to the group call identification (group call ID) carried in the group call initiation message sent by the user when the network side of the trunked communication system of the GSM system initiates a group call ;

The paging unit 20 is used to, according to the other user identifications (user IDs) in the group where the user is indexed by the indexing unit 10, page other users in the group to the group call initiated by the user in turn. In this way, the establishment of the group call is completed.

Please refer to Fig. 5, this figure is the specific structural block diagram of paging unit in the system of the present invention, and its paging unit 20 specifically comprises obtaining subunit 201, paging subunit 202, paging response receiving subunit 203, judging subunit 204. The first channel assignment subunit 205, the channel assignment unit 206, and the second channel assignment subunit 207, the functions of their components are as follows:

The obtaining subunit 201 is used to obtain the International Mobile Subscriber Identity IMSI corresponding to each user according to other user IDs in the group where the user is indexed by the indexing unit 10;

The paging subunit 202 is configured to, according to the IMSI of each user acquired by the acquiring subunit 201, sequentially initiate paging for other users in the group;

The paging response receiving subunit 203 is configured to receive a paging response message fed back to the network side by other users in the group after receiving the paging message initiated by the paging subunit 202;

The judging subunit 204 is configured to, for each user who feeds back the paging response message to the paging response receiving subunit 203, judge whether a group call channel has been allocated for the user who feeds back the paging response message;

The first channel assignment subunit 205 is configured to assign the user to the assigned group call channel when the judging result of the judging subunit 204 is yes;

A channel allocation subunit 206, configured to allocate a new group call channel for the user when the judgment result of the judging subunit 204 is negative;

The second channel assignment subunit 207 is configured to assign the user to the new group call channel assigned by the channel assignment subunit 206 .

Please refer to Fig. 6, which is a structural block diagram of the main components of the network side and the terminal equipment side in order to realize the mobility management problem in the system of the present invention, wherein the terminal equipment includes a cell positioning unit 401 and a reselection notification sending unit 402, and each component The section works as follows:

The cell locating unit 401 is used for locating a suitable new cell according to the signal quality of each neighboring cell when the group call is successfully established and the user is a receiving user;

A reselection notification sending unit 402, configured to send a reselection notification message to the network side in the new cell located by the cell positioning unit 401;

The network side specifically further includes a first judgment unit 301, a first channel assignment unit 302, a channel assignment unit 303, a second channel assignment unit 304, a downlink detection unit 305, a second judgment unit 306, and a channel deletion unit 307, each of which The main functions of the components are as follows:

The first judging unit 301 is configured to judge whether there is an established group call channel in the new cell according to the reselection notification message sent by the reselection notification sending unit 402;

The first channel assignment unit 302 is configured to assign the receiving user to an existing group call channel in the new cell when the judgment result of the first judging unit 301 is yes;

A channel allocation unit 303, configured to allocate a new group call channel for the new cell when the determination result of the first determination unit 301 is negative;

The second channel assignment unit 304 is configured to assign the receiving user to the new group call channel assigned by the channel assignment unit 303;

A downlink detection unit 305, configured to perform downlink detection processing in the original cell where the receiving user is located;

The second judging unit 306 is configured to judge whether there are other receiving users in the original cell according to the detection result of the downlink detecting unit 305;

The channel deletion unit 307 is configured to delete the group call channel in the original cell when the second determination unit 306 determines that the result is negative.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (10)

1. A method for setting up a group call, characterized in that, comprising steps: A. When the network side of the trunking communication system of the GSM system initiates a group call, according to the group call identifier carried in the group call initiation message sent by the user, the group where the user is located is indexed; and B. Paging other users in the group to the group call initiated by the user in turn according to the other user identifiers in the group where the user is indexed, and completing the establishment of the group call; C. In the established group call, the receiving user implements mobility management through cell reselection processing, specifically including: c1. The receiving user locates a new cell, and sends a reselection notification message to the network side in the new cell; c2. After receiving the reselection notification message, the network side judges whether there is a group call channel in the new cell, and if so, assigns the receiving user to the group call channel in the new cell; otherwise, the group call channel in the new cell The new cell allocates a group call channel, and assigns the receiving user to the allocated group call channel. 2. The method according to claim 1, wherein the group call identifier is a group call number. 3. The method according to claim 1, wherein the user identifier is a user number. 4. The method according to claim 3, wherein said step B specifically comprises the steps of: B1, the network side of the trunking communication system of the GSM standard obtains the International Mobile Subscriber Identity code corresponding to each user according to the other user number information in the group where the user is located; and B2. Initiate paging for other users in the group in turn according to the acquired IMSI of each user; B3. After receiving the paging message sent by the network side, each other user in the group feeds back a paging response message to the network side; B4. For each user who feeds back the paging response message, the network side judges whether a group call channel has been assigned for the user who feeds back the paging response message, if yes, assign the user to the assigned group call channel; otherwise The user is assigned a group call channel, and the user is assigned to the assigned group call channel. 5. The method according to claim 1, wherein in the established group call, the speaking user implements mobility management through cell handover processing. 6. The method according to claim 1, wherein the process of realizing mobility management of the receiving user through cell reselection further comprises: c3. The network side performs downlink detection in the original cell where the receiving user is located to determine whether there is still a receiving user in the original cell, and if so, retain the group call channel in the original cell; otherwise delete the original cell Group call channel in the cell. 7. The method according to claim 1 or 4, characterized in that the trunking communication system of the GSM standard is a GT800 trunking communication system. 8. A group call establishment system, characterized in that it comprises a trunked communication system network side and terminal equipment of the GSM standard, and the network side comprises: The indexing unit is used to index the group where the user belongs to according to the group call identifier carried in the group call initiation message sent by the user when the network side of the trunking communication system of the GSM system initiates a group call; a paging unit, configured to sequentially page other users in the group to the group call initiated by the user according to the other user identifiers in the group where the user is indexed by the indexing unit, to complete the establishment of the group call; The terminal equipment includes: The cell positioning unit is used to locate a new cell when the user acts as a receiving user after the group call is established successfully; A reselection notification sending unit, configured to send a reselection notification message to the network side in the new cell located by the cell positioning unit; The network side also includes: A first judging unit, configured to judge whether there is a group call channel in the new cell according to the reselection notification message sent by the reselection notification sending unit; A first channel assignment unit, configured to assign the receiving user to a group call channel in the new cell when the judgment result of the first judging unit is yes; a channel allocation unit, configured to allocate a group call channel to the new cell when the determination result of the first determination unit is negative; and The second channel assignment unit is configured to assign the receiving user to the group call channel assigned by the channel assignment unit. 9. The system according to claim 8, wherein the paging unit specifically comprises: The obtaining subunit is used to obtain the International Mobile Subscriber Identity code corresponding to each user according to other user identifiers in the group where the user is indexed by the indexing unit; The paging subunit is used to sequentially initiate paging for other users in the group according to the International Mobile Subscriber Identity codes of the users obtained by the obtaining subunit; A paging response receiving subunit, configured to receive a paging response message fed back to the network side by other users in the group after receiving the paging message initiated by the paging subunit; The judging subunit is configured to, for each user who feeds back a paging response message to the paging response receiving subunit, judge whether a group call channel has been assigned to the user who feeds back a paging response message; The first channel assignment subunit is used to assign the user to the assigned group call channel when the judgment result of the judging subunit is yes; a channel allocation subunit, configured to allocate a group call channel to the user when the determination result of the determination subunit is negative; and The second channel assignment subunit is configured to assign the user to the group call channel assigned by the channel assignment subunit. 10. The system according to claim 8, wherein the network side further comprises: a downlink detection unit, configured to perform downlink detection in the original cell where the receiving user is located; The second judging unit is configured to judge whether there is still an answering user in the original cell according to the detection result of the downlink detection unit; A channel deletion unit, configured to delete the group call channel in the original cell when the judgment result of the second judging unit is negative.

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