CN1486119A - Method and device for generating and distributing temporary mobile group identifiers when user equipment roams - Google Patents

Abstract

A method for generating and distributing a temporary mobile group identifier when a user equipment roams, comprising the steps of: a) sending a message to a serving GPRS support node when the user equipment joins a multicast group; b) serving the GPRS support node to obtain the The temporary mobile group identification of business; c) the serving GPRS support node revises the temporary mobile group identification roaming indication bit according to the roaming situation of the user equipment; d) the serving GPRS support node sends a message to the user equipment, and returns the modified temporary mobile group identification. In the case of user equipment roaming, the probability of repeated assignment of the temporary mobile group identifier is reduced, so that the unity of the temporary mobile group identifier can be better maintained. The content of the paging message is enhanced, so that when the serving GPRS support node sends the paging message, the user equipment will judge whether the target of the paging is itself.

Description

Method and device for generating and distributing temporary mobile group identifiers when user equipment roams

technical field

The present invention relates to multimedia broadcast/multicast service (referred to as MBMS), and in particular to a method for generating and distributing temporary mobile group identifiers of user equipment in a roaming state.

Background technique

The multimedia broadcast/multicast service is a new service being standardized by the Third Generation Partnership Project (abbreviated as 3GPP). The multimedia broadcast/multicast service is a one-way point-to-multipoint service. The biggest feature of this service is that it can effectively utilize wireless resources and network resources. In this service, the multimedia data sent from the data source is sent to multiple users through the transmission network. This point-to-multipoint service can save network resources. Multimedia broadcast/multicast services are mainly used in wireless communication network systems, such as Wideband Code Division Multiple Access (WCDMA for short), Global System for Mobile (GSM for short), and the like. The transmission of multimedia broadcast/multicast service data basically goes through several processes: data source transmission, intermediate network transmission, destination cell air transmission, and user reception. FIG. 5 is a diagram of a logical network device capable of providing multimedia broadcast/multicast services. In this figure, the multimedia broadcast/multicast services actually utilize a General Packet Radio Service (GPRS for short) network as the core transmission network. As shown in Figure 5, the broadcast/multicast service center (abbreviated as BM-SC) is the data source for sending multimedia broadcast/multicast service data; the gateway GPRS support node (abbreviated as GGSN) is used for the connection between the GRPS network and the external network, such as INTERNET, used in multimedia broadcast/multicast services to connect broadcast/multicast service centers and send multimedia broadcast/multicast service data to specific service GPRS support nodes (SGSN for short); Cell Broadcast Center (CBC for short) is a cell The broadcast data source, in the multimedia broadcast/multicast service, by interconnecting the cell broadcast center with the broadcast/multicast service center, the cell broadcast center can provide the multimedia broadcast/multicast service announcement function; the serving GPRS support node is used to The user equipment performs access control and mobility management and at the same time sends the multimedia broadcast/multicast service data from the gateway GPRS support node to a specific radio unit controller (RNC for short); the radio unit controller is used to control a group of base stations ( Referred to as NODE B) and transmits multimedia data to a specific base station; the base station establishes an air physical channel for the multimedia broadcast/multicast service of a certain cell under the control of the wireless unit controller; the terminal user equipment (referred to as UE) is the receiver Terminal equipment for multimedia broadcast/multicast service data.

Figure 6 shows the entire process of the multimedia broadcast/multicast service from service announcement, user joining, service notification, radio bearer establishment to final user leaving.

000 Subscription Once the connection between the user and the service provider is established, the authorized user can receive related multimedia broadcast/multicast services.

001 Service Announcement—Notifies the user of the service to be provided. For example, the system wants to broadcast a football match in downtown Beijing at 7:00 pm.

002 join-indicates that the user joins a group, that is, the user tells the network that he or she is willing to receive the multicast service.

003 Multimedia Broadcast/Multicast Service Multicast Bearer—Establish network resources for multimedia broadcast/multicast service data transmission.

004 Multimedia Broadcast/Multicast Service Notification—informing the user of the upcoming multimedia broadcast/multicast service data transmission.

005 data transmission—represents the process of transmitting multimedia broadcast/multicast service data to users.

006 Multicast Bearer Release for Multimedia Broadcast/Multicast Service—indicates that network resources are released after multimedia broadcast/multicast service data transmission is completed.

007 Leave corresponds to 002 Join, which means that the user wants to leave a group, that is, he no longer wants to receive data of a certain service.

Since the multimedia broadcast/multicast service is provided to multiple users at the same time, paging blocking is likely to occur during the process of multimedia broadcast/multicast service notification. A Temporary Mobile Group Identity (TMGI for short) is allocated to the users belonging to the same group, so that the defect of paging blocking that is easily caused by simultaneously paging multiple users one by one can be solved. The temporary mobile group identity is sent to the user equipment by the serving GPRS support node through GPRS attach, routing area update or packet-temporary mobile subscriber identity (referred to as P-TMSI) redistribution process before multimedia broadcast/multicast service data transmission. The first assignment should be when the user joins the multimedia broadcast/multicast service. Different multicast services are marked by different temporary mobile group identifiers under the same serving GPRS support node. With the temporary mobile group identity, it is possible to prevent signaling congestion on the radio interface during paging.

The temporary mobile group identifier can be allocated by the gateway GPRS support node, or can be allocated by the broadcast/multicast service center to ensure its uniqueness in the same public land mobile network. However, when the user equipment roams to other public land mobile networks, there is no way to ensure that the temporary mobile group identity in the visited public land mobile network does not overlap with the temporary mobile group identity in the home public land mobile network. If the temporary mobility group identifier is repeated, when the serving GPRS support node sends paging to the user equipment, it will cause confusion, resulting in multiple paging failures.

Contents of the invention

The purpose of the present invention is to provide a method for generating and distributing temporary mobile group identifiers of user equipment in a roaming state, so as to avoid or establish and reduce the probability of occurrence of situations where the same temporary mobile group identifier indicates different multimedia broadcast/multicast services .

A method for generating and distributing temporary mobile group identifiers when user equipment roams, comprising steps:

a) sending a message to the serving GPRS support node when the user equipment joins the multicast group;

b) the serving GPRS support node obtains the temporary mobile group identity of the service from the gateway GPRS support node;

c) The serving GPRS support node modifies the roaming indication bit of the temporary mobile group identifier according to the roaming situation of the user equipment;

d) The serving GPRS support node sends a message to the user equipment, and returns the modified temporary mobility group identifier.

In the case of user equipment roaming, the probability of repeated allocation of temporary mobile group identifiers is reduced,

Therefore, the uniqueness of the temporary mobile group identifier can be better maintained. The content of the paging message is enhanced, so that when the serving GPRS support node sends the paging message, the user equipment will judge whether the target of the paging is itself.

Description of drawings

FIG. 1 is a process of updating a routing area of a user equipment in a roaming state;

Fig. 2 is the solution of the paging problem under repeated distribution of temporary mobile group identification;

Fig. 3 is when the user equipment joins the multimedia broadcast/multicast service multicast group, the distribution process of the temporary mobile group identifier;

Fig. 4 is the generation process of temporary mobile group identification roaming indication bit;

Fig. 5 is a logical network device diagram of a multimedia broadcast/multicast service;

FIG. 6 is a multicast service flow of the multimedia broadcast/multicast service.

Detailed ways

1) Generation method of the temporary mobile group identifier roaming indication bit When the serving GPRS support node paging the multicast group of the multimedia broadcast/multicast service, the temporary mobile group identifier is used to perform group paging. The temporary mobile group identifier for a certain multimedia broadcast/multicast service is generated by the gateway GPRS support node or the broadcast/multicast service center, and distributed to the serving GPRS support node when the serving GPRS support node joins the multicast group. The serving GPRS support node judges whether this service is for the local user equipment or for the roaming user equipment. According to different situations, the serving GPRS support node sets the roaming indication bit in the temporary mobility group identifier, for example, 0 indicates a local user equipment, and 1 indicates a roaming user equipment.

2) For roaming user equipment, the distribution process of the temporary mobile group identity

Usually, the temporary mobile group identifier is allocated during the process of joining the multicast group of the multimedia broadcast/multicast service by the user equipment. For the user equipment in the roaming state, when the user equipment updates the routing area, the serving GPRS support node knows the temporary mobile group identity of the multimedia broadcast/multicast service that the user equipment joins, and the temporary mobile group identifier in the response message The group identifier is modified, and the new temporary mobile group identifier is included in the response message and sent to the user equipment.

3) Signaling process when the temporary mobile group identifier is repeated

If the same temporary mobile group identifier is assigned to different services from two different public land mobile networks, when the serving GPRS support node sends paging, different roaming users will receive the paging message marked with the temporary mobile group identifier. The paging message also carries the APN identifying the multimedia broadcast/multicast service and the IP multicast address or public land mobile network identifier, so as to help the user equipment to be sure that the service belongs to itself.

4) New paging message

When the serving GPRS support node knows that the paging object is a user equipment in a roaming state, the serving GPRS support node carries the APN and IP multicast address or public land mobile network identifier of the multimedia broadcast/multicast service in the paging message, so that the user Devices can be distinguished. The parameters in the paging include: APN and IP multicast address or public land mobile network identifier.

Example

Fig. 4 is the generation process of the roaming indication bit of the temporary mobile group identifier. After the serving GPRS support node joins the multimedia broadcast/multicast service multicast group for the first time, it can obtain the temporary mobile group identification for this service from the gateway GPRS support node, and the temporary mobile group identification can be obtained by the gateway GPRS support node Or broadcast/multicast service center distribution. The serving GPRS support node stores the mapping relationship between the temporary mobile group identifier and the corresponding multimedia broadcast/multicast service APN and IP multicast address, and maintains a mapping relationship between the temporary mobile group identifier and the user equipment identifier. The serving GPRS support node checks whether the user equipment is in a roaming state, sets the roaming indication bit of the temporary mobile group identity according to the roaming state of the user equipment, and then notifies the user equipment of the temporary mobile group identity through a corresponding message.

FIG. 1 is a process of updating a routing area of a user equipment in a roaming state. When the user equipment arrives in a new routing area, it will initiate a routing area update request message to the new serving GPRS support node. The new service GPRS support node exchanges the multimedia broadcast/multicast service context of the user equipment with the old service GPRS support node, and can know the multimedia broadcast/multicast service multicast group and its APN and IP multicast address and the multicast group that the user equipment has joined. Temporary mobile group ID of the multicast group. The serving GPRS support node knows that the user equipment is in a roaming state, so it modifies the roaming indication bit of the temporary mobile group identifier, and then notifies the user equipment of the new temporary mobile group identifier in the routing area update acceptance.

Fig. 3 is a distribution process of the temporary mobile group ID when the user equipment joins the multicast group of the multimedia broadcast/multicast service. When the user equipment joins the multimedia broadcast/multicast service multicast group, the user equipment sends a request for activating the multimedia broadcast/multicast service context to the serving GPRS support node, and the message includes the APN and IP multicast address of the multimedia broadcast/multicast service. After the serving GPRS support node receives the request, it receives from the gateway GPRS support node the temporary mobile group identity distributed by the gateway GPRS support node or the broadcast/multicast service center. The serving GPRS support node knows that the user equipment is a local user, correspondingly sets the temporary mobile group identifier roaming indication bit, and notifies the user equipment of the temporary mobile group identifier in the context acceptance message for activating multimedia broadcast/multicast services. Fig. 2 is a solution to the paging problem under repeated allocation of temporary mobile group identifiers. When the same temporary mobile group identity is assigned to different services, the serving GPRS support node shall carry the APN and IP group of the multimedia broadcast/multicast service in the paging message when performing paging for such temporary mobile group identity broadcast address or public land mobile network identity. When user equipment 1 and user equipment 2 receive the paging message, they check whether the APN and IP multicast address are the same as those of the multimedia broadcast/multicast service multicast group they have joined or check whether the public land mobile network identity is the same as that of the user The network identification of the device itself is consistent. If the received parameters of user equipment 1 are consistent with the saved parameters, it initiates a service request to the serving GPRS support node, and if the parameters of user equipment 2 are inconsistent, no response is necessary.

Claims (6)

1. the generation and the distribution method of Temporary Mobile Group Identity during a user's set roaming comprise step:

Send message to Serving GPRS Support Node when a) subscriber equipment adds multicast group;

B) Serving GPRS Support Node obtains this professional Temporary Mobile Group Identity from Gateway GPRS Support Node;

C) Serving GPRS Support Node is provided with Temporary Mobile Group Identity roaming indicating bit according to the roaming condition of subscriber equipment;

D) Serving GPRS Support Node sends message to subscriber equipment, returns the Temporary Mobile Group Identity of setting.

2. method according to claim 1 is characterized in that the roaming indicating bit is arranged in the Temporary Mobile Group Identity.

3. method according to claim 1 is characterized in that also comprising step:

Serving GPRS Support Node changes the Temporary Mobile Group Identity that obtains from Gateway GPRS Support Node, whether is in roaming state according to subscriber equipment and changes the roaming indicating bit.

4. the generation and the distribution method of Temporary Mobile Group Identity during a user's set roaming comprise step when Temporary Mobile Group Identity is duplicatedly distributed:

A) Serving GPRS Support Node obtains the data of multimedia broadcast/group broadcast service from Gateway GPRS Support Node;

B) Serving GPRS Support Node sends beep-page message to subscriber equipment;

C) beep-page message carries APN and the IP multicast address or the Public Land Mobile Nerwork sign of Temporary Mobile Group Identity and multimedia broadcast/group broadcast service;

D) subscriber equipment is received beep-page message, checks and oneself whether has applied for this Temporary Mobile Group Identity corresponding service or checked whether the Public Land Mobile Nerwork sign is consistent with the network identity of oneself;

E) if not, subscriber equipment abandons this message, if subscriber equipment checks whether APN and IP multicast address corresponding with Temporary Mobile Group Identity;

F) if corresponding, then carry out service request, otherwise subscriber equipment abandons this beep-page message.

5. by the described method of claim 4, it is characterized in that carrying in the beep-page message APN and the IP multicast address or the Public Land Mobile Nerwork sign of MBMS business.

6. the device that can revise Temporary Mobile Group Identity is characterized in that and the roaming indicating bit in the Temporary Mobile Group Identity can be made amendment according to the roaming state of subscriber equipment; Obtain Temporary Mobile Group Identity from Gateway GPRS Support Node at a certain MBMS business; Give subscriber equipment with amended message by response pass.

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