CN110876118B

CN110876118B - Method and device for processing group service and configuring group service area

Info

Publication number: CN110876118B
Application number: CN201811014359.9A
Authority: CN
Inventors: 闫翠翠; 王玮
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2018-08-31
Filing date: 2018-08-31
Publication date: 2022-08-19
Anticipated expiration: 2038-08-31
Also published as: WO2020042585A1; CN110876118A

Abstract

The invention provides a method and a device for group service processing and group service area configuration, wherein the group service processing method comprises the following steps: the MCPTT server receives a group service request message initiated by the MCPTT client; the MCPTT server identifies a target service area corresponding to the group identifier and the cell identifier, and activates a TMGI corresponding to the target service area; the MCPTT server informs the UE in the service group of the mapping relation between the group identification and the TMGI; the MCPTT server sends a TMGI activation message to the BM-SC; the MCPTT server notifies the MCPTT client to receive data on a Multicast Transport Channel (MTCH) corresponding to the TMGI. In the invention, the service limited area is configured at the MCPTT server side, and the MBSFN area is identified according to the position of the service initiator, so that the service is initiated and always limited to a specific MA area, thereby overcoming the problem that the MCPTT service cannot be adapted to a specific use scene.

Description

Method and device for processing group service and configuring group service area

Technical Field

The invention relates To the field of communication, in particular To a method and a device for processing a key task Push To Talk (MCPTT) group service and configuring a group service area.

Background

Currently, a broadband digital trunking system based on Long Term Evolution (LTE) technology has become a development direction of a next generation trunking system, and research and establishment of relevant standards have been started internationally. The third Generation partnership Project (3 GPP) has proposed to be applied to a Group Communication/trunking Communication standard framework (GCSE) on top of the LTE technology, and has formulated the MCPTT trunking voice Service standard and the enhanced Multimedia broadcast Multicast Service (eMBMS) specification. The MCPTT standardizes the realization standard of the PTT service in the LTE network, designs a call control process at an application layer, and realizes a perfect voice cluster function. The eMBMS is used as a technical scheme of a wireless side, provides a point-to-multipoint multimedia service technology for simultaneously transmitting the same type of service from a data service source to a plurality of users in a specific range, and improves the utilization rate of air interface resources.

In the existing MCPTT protocol, before service initiation, the binding of group service and eMBMS multicast bearer is completed according to a predefined bearer mode, and UE completes the acquisition of the multicast bearer during registration. Since the Service coverage of eMBMS is developed according to a Service Area (MBSFN Area, abbreviated as MA) of a Multicast broadcast Service (MBMS), group communication is developed in a user group unit, and does not support a Service form in which a trunking Service is developed in a specific Service Area. For example, in a dispatching department for train command on a railway, such as a marshalling yard and a dispatching station, a group of users needs to process a large amount of shunting operation in a service area, the service area is concentrated, and the group of users in the group, which are not in the service area, does not need to participate in the service. However, the current MCPTT service cannot adapt to the usage scenario of such specific service areas.

Disclosure of Invention

The embodiment of the invention provides a method and a device for group service processing and group service area configuration, which at least solve the problem that the MCPTT service in the related technology can not be adapted to a specific service area.

According to an embodiment of the present invention, a method for processing a group service is provided, including: a key task push-to-talk (PTT) MCPTT server receives a group service request message initiated by an MCPTT client, wherein the group service request message carries a service identifier of the group service, a group identifier of a service group and a cell identifier of a cell where the MCPTT client resides; the MCPTT server identifies a target service area corresponding to the Group identifier and the cell identifier, and activates a Temporary Mobile Group Identity (TMGI) corresponding to the target service area; the MCPTT server informs the UE in the service group of the mapping relation between the group identification and the TMGI; the MCPTT server sends a TMGI (multimedia messaging Service) activation message to a Broadcast-Multicast Service center (BM-SC), wherein the TMGI activation message carries the target Service area, the TMGI and the group identifier; the MCPTT server notifies the MCPTT client to receive data on a Multicast Traffic Channel (MTCH) corresponding to the TMGI.

Wherein identifying the target service area corresponding to the group identity and the cell identity comprises: acquiring group information of the service group represented by the group identifier, wherein the group information comprises a service area corresponding to the service group, a Multicast Broadcast Single Frequency Network (MBSFN) area contained in the service area, and a cell list contained in the MBSFN area; identifying a target MBSFN area of which the cell list comprises the cell identifier and the target service area comprising the target MBSFN area in the group information.

After acquiring the group information of the service group represented by the group identifier, the method further includes: and under the condition that a target MBSFN (multicast broadcast single frequency network) area containing the cell identifier in the cell list is not identified in the group information, the MCPTT server confirms that the MCPTT client is not in the target service area, and the MCPTT server refuses to send the group service to the MCPTT client.

Wherein the obtaining the TMGI corresponding to the target service area includes: and interacting with the BM-SC to acquire the TMGI when the group information identifies that the cell list comprises the target MBSFN area of the cell identifier and the target service area comprising the target MBSFN area.

Wherein interacting with the BM-SC comprises: transmitting a TMGI acquisition message to the BM-SC by a Policy and Charging Rules Function (PCRF), wherein the TMGI acquisition message carries the service identifier, the group identifier, and the identifier of the target MBSFN area; and acquiring the TMGI which is transmitted by the BM-SC and corresponds to the service identifier and the identifier of the target MBSFN area.

Wherein, in notifying the MCPTT client to receive data on the MTCH channel corresponding to the TMGI, the method further comprises: notifying the MCPTT client to parse a Multicast Control Channel (MCCH), receive Multicast Channel scheduling Information (MSI) and a Physical Multicast Channel (PMCH), and receive Multicast data.

According to an embodiment of the present invention, there is also provided a method for configuring a group service area, including: the key task push-to-talk (PTT) MCPTT server configures one or more service areas for a service group, wherein each service area comprises one or more Multicast Broadcast Single Frequency Network (MBSFN) areas, and each MBSFN area comprises a cell list; the MCPTT server informs a group management server to record information of the configured service areas, wherein the information of the service areas comprises the identification of the one or more service areas.

Wherein, the said MCPTT server informs the group management server of recording the information of the configured service area includes: and the MCPTT server informs the group management server to record the configured identification of the service area in a field added in the group configuration data.

Wherein, the said MCPTT server informs the group management server of recording the information of the configured service area includes: the MCPTT server informs a group management server to record the identifiers of the one or more service areas, the identifiers of the one or more MBSFN areas and the cell list which have the mapping relation.

According to an embodiment of the present invention, there is also provided a device for processing a group service, including: a receiving module, configured to receive a group service request message initiated by a key task push-to-talk MCPTT client, where the group service request message carries a service identifier of the group service, a group identifier of a service group, and a cell identifier of a cell where the MCPTT client resides; the identification module is used for identifying a target service area corresponding to the group identifier and the cell identifier and activating a Temporary Mobile Group Identifier (TMGI) corresponding to the target service area; a first notification module, configured to notify the UE in the service group of the mapping relationship between the group identifier and the TMGI; a sending module, configured to send a TMGI activation message to a broadcast multicast service center BM-SC, where the TMGI activation message carries the target service area, the TMGI, and the group identifier; a second notifying module, configured to notify the MCPTT client to receive data on the multicast transport channel MTCH corresponding to the TMGI.

Wherein the acquisition module comprises: a first obtaining unit, configured to obtain group information of the service group, where the group information includes a service area corresponding to the service group, a multicast broadcast single frequency network MBSFN area included in the service area, and a cell list included in the MBSFN area; a second obtaining unit, configured to identify, in the group information, a target MBSFN area whose cell list includes the cell identifier and the target service area including the target MBSFN area.

According to an embodiment of the present invention, there is also provided a device for configuring a group service area, including: a configuration module, configured to configure one or more service areas for a service group, where each service area includes one or more multicast broadcast single frequency network MBSFN areas, and each MBSFN area includes a cell list; and the notification module is used for notifying the group management server to record the information of the configured service areas, wherein the information of the service areas comprises the identification of the one or more service areas.

Wherein the notification module comprises: a first notifying unit, configured to notify the group management server to record the identifier of the configured service area in a field added in group configuration data.

Wherein the notification module comprises: a second notifying unit, configured to notify the group management server to record the identifiers of the one or more service areas, the identifiers of the one or more MBSFN areas, and the cell list, which have a mapping relationship.

According to an embodiment of the present invention, there is also provided a storage medium having a computer program stored therein, wherein the computer program is configured to perform the method described in the preceding embodiment when executed.

According to an embodiment of the present invention, there is also provided an electronic apparatus, including a memory and a processor, the memory storing therein a computer program, the processor being configured to execute the computer program to perform the method described in the foregoing embodiment.

In the embodiment of the invention, the service limited area is configured at the MCPTT server side, and the MBSFN area is identified according to the position of the service initiator, so that the service is always limited to a specific MA area during service initiation and service execution, and the problem that the MCPTT service cannot be adapted to a specific use scene is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:

FIG. 1 is a schematic diagram of an MBSFN area according to an embodiment of the present invention;

fig. 2 is a flowchart of a group service processing method according to an embodiment of the present invention;

FIG. 3 is a flow chart of a group zone configuration method according to an embodiment of the invention;

fig. 4 is a schematic diagram of an MCPTT server architecture according to an embodiment of the present invention;

fig. 5 is a schematic diagram of an MCPTT server architecture according to an embodiment of the present invention;

fig. 6 is a schematic diagram of MCPTT + MBMS function architecture according to an embodiment of the present invention;

fig. 7 is a flowchart of bearer creation and activation thereof for an eMBMS-based regional group call service according to an embodiment of the present invention;

fig. 8 is a flowchart of network element interaction in an originating phase of an eMBMS-based regional group call service according to an embodiment of the present invention;

FIG. 9 is a flowchart illustrating a scenario moving across service areas according to an embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the drawings and embodiments. It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The terms used in the examples of the present invention are explained below:

MBMS Service Area: refers to a geographical area of a network in which MBMS services are transmitted, i.e., an area in which eMBMS services are provided. The area comprises a cell for executing the MBSFN service and a cell which does not execute the MBSFN but is matched with the MBSFN for power control.

MBSFN Synchronization Area: refers to a geographical area within which synchronization between enodebs can be achieved and MBSFN transmission can be performed. On a given frequency, an eNodeB can only belong to one MBSFN Synchronization Area.

Synchronization refers to the region having the capability to transmit the same eMBMS service; the capability ensures that the air interfaces of all eNodeBs in the same multicast service area are simultaneously transmitted, and when a user moves in the area and receives a certain multicast service, the service is ensured to be received in a seamless way in time.

MBSFN Area (SA), a set of cells coordinated to enable MBSFN transmission in an MBSFN synchronization Area. One cell in an MBSFN synchronization area may belong to multiple MBSFN areas, where each MBSFN area has different services and cell sets, and the cells in these areas transmit the same content for MBSFN merging on a UE. MBSFN areas transmissions from multiple cells must adhere to strict time synchronization.

The MA is a multicast cell, which is a logical concept, and it can be understood that multicast is a super cell, and only all physical resources in the cell are scheduled uniformly, but each cell takes out a part of resources for scheduling uniformly.

Fig. 1 below illustrates the relationship of these regions as an example. As shown in fig. 1, one MBSFN synchronization area supports one independent MBSFN area a and two overlapping MBSFN areas B and C.

Group1 is an independent cell for non-MBSFN MBMS transmission, and is a single cell for transmitting MBMS service on an MBMS service area, and the cell does not belong to an MBSFN synchronization area, so that the MBSFN transmission mode cannot be used. Single cell MBMS transmission can still be used in LTE, which does not require the synchronization mechanism required for MBSFN operation and therefore cannot achieve strict synchronization. The single-cell MBMS transmission uses a normal DLSCH downlink shared channel, and the selection between MBSFN transmission and single-cell transmission is performed by a multi-zone/Multicast Coordination Entity (MCE) when MBMS service transmission is established.

Groups 2-5 belong to the same MBSFN synchronization area, and MBSFN transmission is possible in their respective MBSFN areas. Group 2, group 3, and group 5 may MBSFN transmit within their respective MBSFN areas a, B, and C. Group 4 is formed of overlapping cells belonging to MBSFN area B and area C.

The present embodiment provides a group service processing method, and fig. 2 is a flowchart of a group service processing method according to an embodiment of the present invention, and as shown in fig. 2, the flowchart includes the following steps:

step S202, an MCPTT server receives a group service request message initiated by an MCPTT client, wherein the group service request message carries a service identifier of the group service, a group identifier of a service group and a cell identifier of a cell where the MCPTT client resides;

step S204, the MCPTT server identifies a target service area corresponding to the group identifier and the cell identifier, and activates a TMGI corresponding to the target service area;

step S206, the MCPTT server informs the UE in the service group of the mapping relation between the group identification and the TMGI;

step S208, the MCPTT server sends a TMGI activation message to the BM-SC, wherein the TMGI activation message carries the target service area, the TMGI and the group identifier;

step S210, the MCPTT server notifies the MCPTT client to receive data on the MTCH channel corresponding to the TMGI.

In the above embodiment, the MBSFN area of the group service is determined according to the location of the service initiator, so that the service initiation and execution are always limited to a specific MA area, thereby solving the problem that the MCPTT service in the prior art cannot adapt to a specific usage scenario.

The present embodiment further provides a method for configuring a group service area, and fig. 3 is a flowchart of a method for configuring a group service area according to an embodiment of the present invention, as shown in fig. 3, the flowchart includes the following steps:

step S302, an MCPTT server configures one or more service areas for a service group, wherein each service area comprises one or more MBSFN areas, and each MBSFN area comprises a cell list;

step S304, the MCPTT server informs a group management server to record the configured information of the service areas, wherein the information of the service areas comprises the identifications of the one or more service areas.

In the above embodiment, by configuring the limited area of the group service on the MCPTT server side, the MBSFN area of the group service can be determined according to the location of the service initiator, so that service initiation and service execution are always limited to a specific MA area, thereby solving the problem that the MCPTT service cannot adapt to a specific use scenario in the prior art.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention or portions thereof contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes several instructions for enabling a terminal device (computer, server, network device, or the like) to execute the methods according to the embodiments of the present invention.

In this embodiment, an MCPTT server is further provided, where the MCPTT server is configured to implement the foregoing embodiments and preferred embodiments, and details are not described again after the description is given. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Fig. 4 is a block diagram of an MCPTT server according to an embodiment of the present invention. The present embodiment mainly describes the functions of the modules of the MCPTT server from the viewpoint of the proceeding of the group service. As shown in fig. 4, the apparatus includes a receiving module 10, an obtaining module 20, a first notifying module 30, a sending module 40 and a second notifying module 50.

A receiving module 10, configured to receive a group service request message initiated by an MCPTT client, where the group service request message carries a service identifier of the group service, a group identifier of a service group, and a cell identifier of a cell where the MCPTT client resides;

an identifying module 20, configured to identify a target service area corresponding to the group identifier and the cell identifier, and activate a TMGI corresponding to the target service area;

a first notification module 30, configured to notify the UE in the service group of the mapping relationship between the group identifier and the TMGI;

a sending module 40, configured to send a TMGI activation message to the BM-SC, where the TMGI activation message carries the target service area, the TMGI, and the group identifier;

a second notifying module 50, configured to notify the MCPTT client to receive data on the MTCH channel corresponding to the TMGI.

Fig. 5 is a block diagram of an MCPTT server according to another embodiment of the present invention. In the present embodiment, the functions of the modules of the MCPTT server are mainly described in detail from the configuration perspective of the group service area. As shown in fig. 5, the MCPTT server includes a configuration module 60 and a notification module 70.

A configuration module 60, configured to configure one or more service areas for a service group, where each service area includes one or more MBSFN areas, and each MBSFN area includes a cell list;

a notifying module 70, configured to notify the group management server to record information of the configured service areas, where the information of the service areas includes the identifiers of the one or more service areas.

In this embodiment, the MCPTT server structure module is mainly described from the configuration perspective of the group service area, but of course, this embodiment may be combined with the MCPTT server shown in fig. 4, that is, the MCPTT server in this embodiment may also include each functional module of the MCPTT server shown in fig. 4, thereby forming an MCPTT server having group service area configuration and corresponding group service processing.

It should be noted that the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.

Fig. 6 is a schematic diagram of the MCPTT + MBMS functional architecture according to an embodiment of the present invention. The following embodiments can all be implemented based on this functional architecture.

As shown in fig. 6, GCSE Application and GCSE Application Server are Application layers, and provide end-to-end trunking services for trunking users. The eNB is a radio access network and is an air interface access part of 3 GPP. The EPC is an evolved packet core network and provides unicast and multicast bearer processing, wherein the MME, the S-GW and the P-GW are unicast core network elements. The MUSE comprises multicast core network elements such as MBMS-GW, BM-SC and the like.

The embodiment provides an eMBMS-based method for restricting the MCPTT area service based on the existing eMBMS protocol and MCPTT protocol. By configuring a group service limited AREA at the MCPTT server side and a limited relation with the MBSFN AREA, the MBSFN AREA is identified according to the position of an initiator, so that the service is initiated and carried out to be always limited to the specific MBSFN AREA.

The embodiment is mainly described in detail from the following two parts:

1. and (4) area configuration.

2. And (5) service initiation process.

The area configuration part mainly comprises the following steps:

the MCPTT Server configures a cluster service area, and specifically, the configuration of the service area is added in a Group management Server of the MCPTT Server. The trunking service area is based on a specific group (Goup), and one group may correspond to multiple service areas, i.e., a set of multiple MA areas may be configured. The service AREAs are logical concepts, and the mapping of the relationship between each service AREA and the corresponding MBSFN AREA needs to be completed when the service AREAs correspond to the physical AREAs. And simultaneously, all physical cell identifications contained in the MBSFN AREA are quoted.

For the service initiation process, the method mainly comprises the following steps:

1. the MCPTT Client1 initiates an MCPTT Group service, carries the Group ID and the position information of the resident cell. And after the message reaches the MCPTT Server, judging the corresponding relation between the initiating position of the MCPTT Client1 and the cluster service area. Namely, the limited AREA initiated by the service is matched according to the mapping relation among the group ID, the MBSFN AREA and the cell list contained in the MBSFN AREA.

2. The MCPTT Server adopts a dynamic establishment mode for the establishment of the multicast bearer.

The step 2 is divided into the following detailed steps:

1) the MCPTT Server sends a TMGI acquisition message corresponding to the service region signing service to the BM-SC, and the TMGI acquisition message carries a corresponding Group service identifier, a service region identifier (namely a plurality of MA sets) and a Group ID. BM-SC returns Service ID configured in the Service region to form TMGI, which responds to MCPTT Server.

2) The MCPTT Server uses a GC1 port to inform the mapping relation between the Group IDs of all users in a Group (Group) and the TMGI corresponding to the service through SIP messages.

3) And after receiving the message, the UE in the Group stores the mapping relation between the Group ID and the TMGI corresponding to the service.

3.MCPTT SERVER initiates the activation process of the TMGI, and the message is sent to BM-SC, at least carrying the service area, TMGI and Group ID. After receiving the message, BM-SC completes the scheduling of radio resource in multicast sub-frame through MCE network element and responds the activation result of TMGI to GCS AS. At this time, the MCE organizes to send an MBSFNAreaConfiguration message over the air interface, where the message includes the MBSFN area information, the TMGI for resource scheduling, and the Session information. After resolving PMCH, eNodeB adds IP multicast address distributed by MBMS-GW to prepare to receive media stream.

4. The MCPTT Client analyzes the MCCH channel, receives MSI and PMCH, receives an MTCH channel corresponding to the TMGI, and receives multicast data.

The first embodiment is as follows: MCPTT Server configuration

The embodiment describes the implementation process of the MCPTT Server configuring a certain service area in detail. The configuration process refers to the configuration of the wireless side MCE for the MBSFN AREA and the cell list information of all base stations corresponding to the MBSFN AREA. The configuration of the service area corresponds to a certain specific cluster group user of the MCPTT, for example, a user group of a certain group call service. Accordingly, this user group can set a plurality of service areas. The selection of the service area depends on the matching of the user location of the originator with the pre-configured service area.

The specific configuration steps are as follows:

the MCPTT Server plans the AREA of a specific user group, and completes the AREA configuration of the MCE for each MBSFN AREA.

2. Adding service AREA identification for a specific user Group in a Group Management Server (Group Management Server) of the MCPTT Server, wherein the number of corresponding service AREAs can be 1 or more, each service AREA corresponds to the MBSFN AREA, and a cell list contained in the MBSFN AREA.

3. In this embodiment, a new field needs to be added to the Group management server corresponding to the protocol (i.e., a new field needs to be added to the Group configuration data), which is specifically shown in the italic part in table 1 below.

Watch 1

Example two

In this embodiment, the MCPTT Server service area analysis process is described in detail, and the specific steps are as follows:

1. the Group user initiates a Group service, carrying a service identifier, an MCPTT Group ID, and a cell ID where the user resides.

And 2, after receiving the service initiating message, the MCPTT Server authenticates the user, interacts with the Group management Server, and acquires the Group information, the Group member list and the Group service area. According to the protocol, the MCPTT Server accesses the group management Server through the CSC-3 interface to acquire group information, wherein the group information comprises all service areas corresponding to the group, an MA list contained in the service areas and a cell list contained in the MA;

and 3, the MCPTT Server judges the MA to which the user belongs according to the cell in which the user resides, and then queries the service area to which the user belongs according to the MA. When the cell initiated by the user does not belong to any MBSFN AREA in the group service AREA, the user is considered not to be in the service AREA, and the MCPTT Server rejects the initiation request of the user; otherwise, the MCPTT Server interacts with the BM-SC according to the service area where the group service is located, obtains the TMGI, and completes the activation process of the multicast bearer.

According to the protocol, one cell in the MBSFN synchronization area can belong to a plurality of MBSFN areas, and when a user initiates a group service in a public cell, MA information to which the initiating cell belongs can be specified. Thus, when the user initiates the group service, a unique service area can be selected according to the group identifier and the resident cell ID.

Example three:

the eMBMS multicast bearer dynamic creation and activation procedure is described in detail in this embodiment. After the mechanism is introduced in this embodiment, when the creation of the eMBMS bearer occurs during service initiation, the creation is triggered by the GCS AS without pre-establishment, so that the utilization rate of radio resources is improved to a greater extent. As shown in fig. 7, the specific steps of this embodiment are as follows:

1, when GCSE AS establishes multicast load for a specific user Group, the request needs to request the BM-SC for TMGI, the request is transmitted to the BM-SC through PCRF network element, and the message carries MA list, Group ID and service identification.

And 2, the BM-SC acquires the TMGI according to the service identifier and the MA identifier and responds to the GCS AS.

And 3, the GCS AS stores the mapping relation of the Group ID, the TMGI and the service area.

And 4. the GCS AS informs the mapping relation of TMGI, Group ID and service identification of the users in the Group through a GC1 port by using SIP messages, for example, SIP MESSAGE messages can be used for informing the users in the Group.

5. The mapping relation between the TMGI and the Group ID is received by the user UE in the Group and then stored, and the mapping relation can not be received by the user UE outside the area.

And 6, the GCS AS initiates an activation flow process of the TMGI in the MBSFN AREA AREA, and the activated flow process carries the corresponding TMGI, the Group ID and the service AREA, namely the MA list.

And 7, the BM-SC interacts with multicast network elements in the area, completes multicast mode resource scheduling at an air interface, and simultaneously returns the information of the activated result of the load, the activated multicast load identification Flow ID, service description and the like to the GCS AS, and the GCS AS maintains the mapping relation between the load and the group service.

Example four

The present embodiment describes the overall group service flow in detail. In the embodiment, when a user initiates a group service defined by an area, the GCS AS completes the process from service area determination, bearer activation to service establishment. It should be emphasized that, for the convenience of illustration in this embodiment, the coverage of each GCS service area is simplified to be independent areas.

The specific implementation process of this embodiment is as follows:

presetting conditions:

the MCPTT Client1, the MCPTT Client2, the MCPTT Client3 and the MCPTT Client4 are configured to be the same Group MCPTT Group1 in the MCPTT Server, wherein 4 users in the Group are taken as an illustration, and at least 2 users in the Group are in practical application.

And 2, configuring a corresponding service restricted AREA by the MCPTT Group1, and assuming that the MBSFN AREA1 and the MBSFN ARE2 ARE configured here, the configuration number of the user Group service AREAs in practical application is not limited.

MBSFN AREA1 contains

cells

1 and 2, MBSFN AREA2 contains cells 3 and 4.

MCPTT Client1 and MCPTT Client2 are located in

cells

1 and 2, and MCPTT Client3 and MCPTT Client4 are located in cells 3 and 4.

The service initiation flow is shown in fig. 8:

1. the Group user MCPTT Client1, which initiates a Group service, carries the MCPTT Group ID, and the cell ID where the MCPTT Client1 resides, i.e., cell 1.

After receiving the service initiation message, the MCPTT Server accesses the Group management Server through a CSC-3 interface to obtain Group information including all service areas corresponding to the Group, an MA list contained in the service areas and a cell list contained in the MA.

And 3, the MCPTT Server analyzes the limited AREA of the current service, and the service is initiated only in the MBSFN AREA1 because the position information of the user reported by the MCPTT Client1 is contained in the MBSFN AREA 1.

And 4, the MCPTT Server acquires the TMGI corresponding to the service channel signed by the corresponding MBSFN AREA1 from the BM-SC, and carries the corresponding MBSFN AREA 1.

And 5, the BM-SC returns the Service identifier configured in the Service area according to the configuration information to form a TMGI, and the TMGI responds to the MCPTT Server.

And 6, the MCPTT Server stores the mapping relation of the TMGI, the Group ID and the MBSFN AREA 1.

And 7, the MCPTT Server uses the mapping relation between the Group IDs of all users in a SIP message notification Group (Group) and the TMGI corresponding to the service through a GC1 port.

And 8, after receiving the message, the MCPTT Client stores the mapping relation between the Group ID and the TMGI corresponding to the service.

And 9, the MCPTT Server initiates an activation process of the TMGI corresponding to the MBSFN AREA1, and the message is sent to the BM-SC and carries the MBSFN AREA1, the TMGI and the Group ID.

And 10, after receiving the message, the BM-SC completes multicast bearer activation on the MBMB AREA1 where the TMGI is positioned, and sends a Session Start Request to the downstream MBMS-GW through configuring downstream MBMS-GW node information and Session related parameters in the background.

And 11, after receiving the Session Start Request, the MBMS-GW creates an MBMS bearing context, stores the Session attribute and a control node list in the MBMS bearing context, and allocates a network transmission IP multicast address and TEID for the Session. A Session Start Response message is returned to the BM-SC. And the MBMS-GW sends a Session Start Request message to the MME in the control node list.

After receiving the Session Start Request, the MME creates an MBMS bearer context and stores the Session attribute; and sending a Session Start Request message to the MCE.

The MCE creates an MBMS bearing context according to the QOS parameter and the wireless resource condition in the message, saves the Session attribute and sends a Session Start Request message to the eNB managed by the MCE;

14, if the eNB accepts the Session Start Request message, the eNB creates an MBMS bearing context; and join the IP multicast group through IGMP agreement, return the Session Start Response message to MCE at the same time;

the MCE returns a Session Start Response message to the MME.

And 16, the MME returns a Session Start Response message to the MBMS-GW.

MBMS-GW responds Session Start Response message to BM-SC.

And the BM-SC responds to the MCPTT Server to carry a bearing activation result and carries bearing information such as TMGI, FlowID, expiration time, service description, BM SC-IP address and port and the like.

And 19, the MCE sends an MBMS Scheduling Information message to the eNB and schedules radio resources for the MBSFN AREA according to the configured multicast subframe. The message includes PMCH information included in each MBSFN area, Session information included in each PMCH, subframe configuration of MBSFN, common subframe allocation period, and MBSFN area ID. After receiving the MBMS Scheduling Information message, the eNB returns an MBMS Scheduling Information Response message to the MCE and simultaneously establishes multicast resources for MBMS transmission, that is, sends an MCCH change notification to an air interface for the MBSFN AREA1 according to a configured multicast subframe, and organizes sending an MBSFNAreaConfiguration message to the air interface according to MBMS bearer context and content in the MBMS Scheduling message, where the message includes PMCH Information of the MBSFN AREA, Session Information included in each PMCH, subframe configuration of the MBSFN, a common subframe allocation period, and an MBSFN AREA ID.

And the eNodeB joins the address according to the configured IP multicast address allocated by the MBMS-GW and the TEID, and prepares to receive the media stream.

And 21, the MCPTT Server initiates a call request sent by the user in the Group, and the call request carries the MCPTT Group ID and the media parameters.

And 22, after the MCPTT Client finishes the negotiation of the media data, starting to receive the media stream by using the multicast. NOTE, since MCPTT Client2 receives the call setup message in MBSFN AREA1, MCPTT Client2 joins the session. And the MCPTT Client3 and MCPTT Client4 do not receive the call setup message and do not join the service.

Example five:

the user cross-service area movement process is described in detail in this embodiment. Specifically, when a user signed with the same Group ID develops a service in a different service area, the user moves from one area to another service area.

The preset conditions are as follows:

1. the precondition for the implementation of this embodiment is that in the service implementation process of the above embodiment 3.

2. When MCPTT Client3 originates the same traffic in cell 3 as MCPTT Client1, similarly, traffic will only be established over MBSFN AREA 2. At this time, the group service is limited by the region, and there are two current service instances which are independent of each other.

The service flow of this embodiment is shown in fig. 9:

during the Group service developed by the MBSFN AREA1, any user (including UE1 and UE2) in the Group is in progress, it is assumed here that MCPTT Client 2(UE2) cannot receive the service after leaving the cell corresponding to the MBSFN AREA1 during the service progress, the GCSE AS does not guarantee service continuity here, starts the switch from multicast to unicast, and deletes the correspondence between Group and TMGI on the UE2 after the service on the MCPTT Client2 is interrupted.

2, after the MCPTT Client2 moves to the MBSFN AREA2, the MCPTT Client2 in any Group in the MBSFN AREA1 receives the mapping relationship between the TMGI and the Group ID sent by the GCS AS, and when the received notification message of establishing the service instance 2 is received, the MCPTT Client2 can access the service.

An embodiment of the present invention further provides a storage medium having a computer program stored therein, wherein the computer program is configured to perform the steps in any of the method embodiments described above when executed.

The storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.

Embodiments of the present invention further provide an electronic device, comprising a memory in which a computer program is stored and a processor configured to execute the computer program to perform the steps in any of the above method embodiments.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for processing a group service, comprising:

a key task push-to-talk (MCPTT) server receives a group service request message initiated by an MCPTT client, wherein the group service request message carries a service identifier of the group service, a group identifier of a service group and a cell identifier of a cell where the MCPTT client resides;

the MCPTT server identifies a target service area corresponding to the group identifier and the cell identifier, and activates a Temporary Mobile Group Identifier (TMGI) corresponding to the target service area;

the MCPTT server informs the UE in the service group of the mapping relation between the group identification and the TMGI;

the MCPTT server sends a TMGI activation message to a broadcast multicast service center BM-SC, wherein the TMGI activation message carries the target service area, the TMGI and the group identification;

the MCPTT server notifying the MCPTT client to receive data on a Multicast Transport Channel (MTCH) corresponding to the TMGI;

wherein identifying the target service area corresponding to the group identity and the cell identity comprises:

acquiring group information of the service group represented by the group identifier, wherein the group information comprises a service area corresponding to the service group, a Multicast Broadcast Single Frequency Network (MBSFN) area contained in the service area, and a cell list contained in the MBSFN area;

identifying a target MBSFN area of which the cell list comprises the cell identifier and the target service area comprising the target MBSFN area in the group information.

2. The method of claim 1, wherein after obtaining group information of the service group represented by the group identifier, the method further comprises:

and under the condition that the target MBSFN area containing the cell identification is not identified in the group information, the MCPTT server confirms that the MCPTT client is not in the target service area, and refuses to send the group service to the MCPTT client.

3. The method of claim 1, wherein activating the TMGI corresponding to the target service region comprises:

and interacting with the BM-SC to acquire the TMGI when the group information identifies that the cell list comprises the target MBSFN area of the cell identifier and the target service area comprising the target MBSFN area.

4. The method of claim 3, wherein interacting with the BM-SC comprises:

transmitting a TMGI acquisition message to the BM-SC through a PCRF network element, wherein the TMGI acquisition message carries the service identifier, the group identifier and the identifier of the target MBSFN area;

and acquiring the TMGI which is transmitted by the BM-SC and corresponds to the service identifier and the identifier of the target MBSFN area.

5. The method of claim 1, wherein in notifying the MCPTT client to receive data on the MTCH channel corresponding to the TMGI, further comprising:

and informing the MCPTT client to analyze a multicast control channel MCCH, receiving multicast channel scheduling information MSI and a physical multicast channel PMCH, and receiving multicast data.

6. An apparatus for processing a group service, comprising:

a receiving module, configured to receive a group service request message initiated by a key task push-to-talk MCPTT client, where the group service request message carries a service identifier of the group service, a group identifier of a service group, and a cell identifier of a cell where the MCPTT client resides;

the identification module is used for identifying a target service area corresponding to the group identifier and the cell identifier and activating a Temporary Mobile Group Identifier (TMGI) corresponding to the target service area;

a first notification module, configured to notify the UE in the service group of the mapping relationship between the group identifier and the TMGI;

a sending module, configured to send a TMGI activation message to a broadcast multicast service center BM-SC, where the TMGI activation message carries the target service area, the TMGI, and the group identifier;

a second notifying module, configured to notify the MCPTT client to receive data on a multicast transport channel MTCH corresponding to the TMGI;

wherein the identification module comprises:

a first obtaining unit, configured to obtain group information of the service group, where the group information includes a service area corresponding to the service group, a multicast broadcast single frequency network MBSFN area included in the service area, and a cell list included in the MBSFN area;

a second obtaining unit, configured to identify, in the group information, a target MBSFN area whose cell list includes the cell identifier and the target service area including the target MBSFN area.

7. A computer-readable storage medium, in which a computer program is stored, wherein the computer program, when being executed by a processor, performs the method of any one of claims 1 to 5.

8. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, and wherein the processor is arranged to execute the computer program to perform the method of any of claims 1 to 5.