CN100372425C - A method for realizing group call roaming of trunking service - Google Patents

Abstract

The invention discloses a method for realizing group call roaming of trunking services. The method includes: presetting a comprehensive group call register, storing group information of each group service cell under the jurisdiction of multiple switching centers; the originating switching center receiving the communication terminal The group call originating call that sends, requests group information to integrated group call register; Integrated group call register provides group information to originating switching center, and this group information includes service switching center identification list, and originating switching center receives described For group information, the originating switching center sends a group call request to the service switching center corresponding to the service switching center identifier according to the received service switching center identification list. According to the present invention, group calls can be initiated for all group serving cells stored in the integrated group call register, thereby realizing group call roaming. Since the integrated group call register centrally stores the group information, the present invention can also realize the centralized management of the group information.

Description

A method for realizing group call roaming of trunking service

technical field

The invention relates to a trunking service group call technology, in particular to a method for realizing trunking service group call roaming.

Background technique

With the rapid development of communication technology, the national security system, public security system, public health system, railway system, etc. need to apply a large number of trunking services. The most important feature of the trunking service is that it can be dispatched and group called. The dispatching function of the trunking service refers to calling a certain number of communication terminals at the same time, so that these communication terminals can talk at the same time; The terminal initiates calls and conducts simultaneous calls at the same time, so as to achieve the effect of "response to all calls".

In the digital trunking system, services such as group call and multicast need to be widely used. For the characteristics of group calls and multicast services facing groups, the group call register (GCR) is set to store group information, such as group serving cell list, relevant mobile switching center (MSC) list, dispatcher information, etc., the described The list of group serving cells only refers to the information of each group serving cells under the jurisdiction of the same MSC. Currently, the GCR is set for each MSC, so the group information stored in the GCR is the group information corresponding to each MSC's jurisdiction. When performing a group call service, the MSC receiving the initial group call obtains the group information from the GCR.

With the widespread application of trunking services, it is necessary for trunking services to support group call roaming, that is, group members make group calls during roaming and group calls are made in multiple group service cells under the jurisdiction of different MSCs. However, since the group information stored in the GCR is group information corresponding to each MSC jurisdiction, if group call roaming is realized, it is necessary to store group information in all GCRs corresponding to roaming MSCs. In this way, GCR needs Store a large amount of group information. The MSC that receives the group call originating call sends a group call notification to the relevant MSC according to the group call information stored in its own GCR, and the relevant MSC performs group call service processing according to the group information stored in its own GCR.

In addition, since the GCR is set for each MSC, even for different groups, the group IDs (IDs) stored in different GCRs are likely to be the same. When implementing group call roaming, the same group ID will be stored in the same GCR, which will lead to some unpredictable problems. For example, the MSC cannot correctly perform the group call service according to the group ID, so that the The group cannot perform group call service. If a communication terminal with group call authority roams to another MSC, and the GCR corresponding to the MSC does not store the information of the group to which it belongs, the group call service cannot be performed either.

In addition, because each MSC needs to set up GCR to store group information, the group information stored in each GCR is relatively independent, which increases the difficulty of group information management and cannot realize centralized management of group information. Group member information is stored in the Home Location Register (HLR). When performing a group call service, the MSC needs to query the HLR for group member rights, which further increases the difficulty of group information management.

Contents of the invention

In view of this, the purpose of the present invention is to provide a method for implementing group call roaming of trunking services, so that the group calls of trunking services can realize roaming.

In order to achieve the above object, the present invention provides a method for realizing group call roaming of the trunking service, the method comprising:

A. Pre-set the integrated group call register to store the group information of each group service cell under the jurisdiction of multiple switching centers;

B. The originating switching center receives the group call originating call sent by the communication terminal, and requests group information from the integrated group call register;

C. The integrated group call register provides group information to the originating switching center, the group information includes a service switching center identification list, and the originating switching center receives the group information, and switches according to the received service A list of center identifiers, sending a group call request to the service switching center corresponding to the service switching center identifier.

Before the step C, it further includes: the comprehensive group call register judges whether the communication terminal identification provided by the originating switching center has the authority to initiate a group call originating call according to the stored group member group call authority, and if so, execute step C .

The step A is: pre-setting a plurality of integrated group call registers, and each integrated group call memory stores the group information of each group service cell under the jurisdiction of a plurality of switching centers;

The step B includes: the originating switching center receives the group call originating call sent by the communication terminal, the group calling originating call carries a group identifier, and the originating switching center routes to the corresponding integrated The group call register requests group call information from the corresponding integrated group call register.

Further comprise the following steps after the step C:

D. The service switching center corresponding to the service switching center identification receives the group call request, and requests the group service cell list corresponding to the service switching center to the integrated group call register;

E. The integrated group call register provides the group service cell list to the service switching center, and the service switching center receives the group service cell list.

After the step E, it further includes: the serving switching center returns a group call response to the originating switching center.

The switching center is a mobile switching center, and after the step E, it further includes: the serving mobile switching center notifies the BSS under its jurisdiction corresponding to the group serving cell to establish group call radio resources.

The step B further includes: the originating switching center assigns a group call origination identifier for the current group call, and sends the group call origination identifier to the integrated group call register, and the integrated group call register stores the group call origination identifier ;

Before the step E, it further includes: the integrated group call register judges whether the group call origination identifier is stored, if yes, execute step E, otherwise, execute step C.

In step C, after the originating switching center receives the group information provided by the integrated group call register, it further includes: the originating switching center notifies the base station subsystem under its jurisdiction to establish group call radio resources.

The group information in step A includes at least: a group identifier, a list of service switching center identifiers and a list of group serving cells; the group information further includes: a group name, or a list of dispatchers, or a group encryption key .

According to the present invention, by setting the integrated group call register to centrally store group information, the switching center that receives the group call originating call only needs to be routed to the integrated group call register to obtain all information related to the group call group, Then, according to the obtained information, a group call request is initiated to a relevant switching center. In this way, group calls can be initiated for all group service cells stored in the integrated group call register, whether they are group service cells under the jurisdiction of the same switching center or group service cells under the jurisdiction of different switching centers, thus realizing group call roaming. Since the group information is centrally stored in the comprehensive group call register, the invention also realizes the centralized management of the group information.

In addition, the integrated group call register also stores the group call authority of the group members. The exchange center does not need to provide other devices to query the group member authority. call authority.

Description of drawings

Fig. 1 is a flow chart of implementing group call roaming in the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

In the present invention, an integrated group call register (IGCR) is set to centrally store group information, and the switching center acquires group information through the IGCR, thereby performing group call services. The group information stored in the IGCR may include: group ID, group name, dispatcher list, group serving cell list, service switching center list, group encryption key, group member identification, etc., and may further include group Group call rights of group members. The group serving cell list may be the group serving cell information corresponding to the group ID managed by the same or different switching centers. The service switching center refers to the switching center that participates in the group call service of a certain group. The switching center mentioned above includes the switch in the fixed communication network and the MSC in the mobile communication network.

Fig. 1 is the flow chart that realizes group call roaming in the present invention, as shown in Fig. 1, the realization process of group call roaming comprises the following steps:

Step 1: The communication terminal initiates a group call origination (call origination) to the MSC where it is located through the base station subsystem (BSS), and the group call origination call carries a group ID (Group ID). After the MSC where the communication terminal is located receives the originating call of the group call, it judges whether it is the originating call of the group call, and if so, executes step 2; otherwise, processes it as a general call.

Step 2: The MSC where the communication terminal is located assigns a group call origination identifier for the current group call, then routes to the IGCR where the group information corresponding to the Group ID is located according to the Group ID, and sends a Group Local Request to the IGCR ), the group call request carries Group ID, MSC ID, group call originator identifier and the identifier of the communication terminal that initiates the group originator call, and requests IGCR to provide group information corresponding to the Group ID. The group call origination identifier is used to identify a group call. After IGCR receives the group call request, it judges whether the communication terminal has the authority to initiate a group call according to the group information corresponding to the Group ID stored by itself, and if so, executes step 3; otherwise, sends a message to the MSC according to the MSC ID A failure response notifies the MSC that the communication terminal is not allowed to initiate a group call, and then the MSC sends a failure response to the communication terminal through the BSS, notifying the communication terminal that it is not allowed to initiate a group call.

Multiple IGCRs can be set in the network, and each IGCR stores different group information. Therefore, it is necessary to determine the IGCR to be accessed according to the Group ID, and the switching center obtains the information for performing the corresponding group call service through the IGCR.

Steps 3 to 4: IGCR stores the originating identifier of the group call, and returns a Group Local Response (Group Local Response) to the MSC where the communication terminal is located according to the MSC ID. The Group Local Response carries group information, such as the serving MSC identifier (MSC ID) list, group serving cell list and other group information. After receiving the group information returned by the IGCR, the MSC notifies the BSS under the jurisdiction of the MSC corresponding to the group serving cell to establish the radio resources required for the current group call.

Step 5 to Step 7: After receiving the group information returned by IGCR, the MSC sends a Group Call Notification (Group Call Notification) to the MSC related to the current group call service according to the MSC ID list in the group information. The group call notification carries There are Group ID, MSC ID and group call origination identification. After receiving the group call notification, the corresponding MSC routes to the IGCR where the group information corresponding to the Group ID is located according to the Group ID, and sends a group call request to the IGCR. The group call request carries the Group ID and the group call origination identifier. After the IGCR receives the group call request, it judges whether it has stored the originating identifier of the group call, and if so, executes step 7; otherwise, executes step 3.

Steps 7 to 10: The IGCR returns a group call response to the relevant MSC, and the MSC returns the group call response carrying the group service cell information under the jurisdiction of the MSC corresponding to the Group ID. After receiving the group call response, the MSC sends a group call notification response (Group Call Notification Answer) to the MSC that received the group call originating call according to the MSC ID. The relevant MSC notifies the BSS corresponding to the group serving cell under its jurisdiction of the radio resources needed to establish the current group call. At this point, the group call channel has been established, and the group call is in the communication state.

It can be seen from the above description that since the group information is stored centrally in the IGCR, the MSC that receives the call initiated by the group call only needs to be routed to the IGCR to obtain all the information related to the group call group, and then according to the obtained information, Initiate a group call request to the relevant MSC. In this way, group calls can be initiated for all group serving cells stored in the IGCR, whether they are under the jurisdiction of the same MSC or under the jurisdiction of different MSCs, thereby realizing group call roaming. Due to the centralized storage of the group information, the present invention also realizes the centralized management of the group information.

In addition, the IGCR also stores the group call rights of the group members, and the MSC does not need to inquire about the group member rights from the HLR, but only needs to exchange information with the IGCR to obtain the group call rights of the group members.

In a word, the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (10)

1. A method for realizing trunking service group call roaming, characterized in that the method comprises the following steps: A. Pre-set the integrated group call register to store the group information of each group service cell under the jurisdiction of multiple switching centers; B. The originating switching center receives the group call originating call sent by the communication terminal, and requests group information from the integrated group call register; C. The integrated group call register provides group information to the originating switching center, the group information includes a service switching center identification list, and the originating switching center receives the group information, and switches according to the received service A list of center identifiers, sending a group call request to the service switching center corresponding to the service switching center identifier. 2. The method of claim 1, wherein, Before the step C, it further includes: the comprehensive group call register judges whether the communication terminal identification provided by the originating switching center has the authority to initiate a group call originating call according to the stored group member group call authority, and if so, execute step C . 3. The method of claim 1, wherein, The step A is: pre-setting a plurality of integrated group call registers, and each integrated group call memory stores the group information of each group service cell under the jurisdiction of a plurality of switching centers; The step B includes: the originating switching center receives the group call originating call sent by the communication terminal, the group calling originating call carries a group identifier, and the originating switching center routes to the corresponding integrated The group call register requests group call information from the corresponding integrated group call register. 4. The method according to claim 1 or 2, characterized in that, further comprising the following steps after the step C: D. The service switching center corresponding to the service switching center identification receives the group call request, and requests the group service cell list corresponding to the service switching center to the integrated group call register; E. The integrated group call register provides the group service cell list to the service switching center, and the service switching center receives the group service cell list. 5. The method according to claim 4, further comprising: after step E, the serving switching center returns a group call response to the originating switching center. 6. The method according to claim 4, wherein the switching center is a mobile switching center, and after step E, it further comprises: the serving mobile switching center notifies the jurisdiction of the service cell corresponding to the group The base station subsystem establishes group call radio resources. 7. The method according to claim 4, wherein said step B further comprises: the originating switching center assigns a group call origination identifier for the current group group call, and sends the group call origination identifier to the integrated group call register. send out the identification, and the integrated group call register stores the group call originating identification; Before the step E, it further includes: the integrated group call register judges whether the group call origination identifier is stored, if yes, execute step E, otherwise, execute step C. 8. The method according to claim 1, 2 or 3, characterized in that, In step C, after the originating switching center receives the group information provided by the integrated group call register, it further includes: the originating switching center notifies the base station subsystem under its jurisdiction to establish group call radio resources. 9. The method according to claim 1, wherein the group information in step A at least includes: a group identifier, a list of service switching center identifiers and a list of group serving cells. 10. The method according to claim 9, wherein the group information further comprises: a group name, or a dispatcher list, or a group encryption key.

Images