WO2010130227A1

WO2010130227A1 - Method for releasing multicasting and broadcasting data path and system thereof

Info

Publication number: WO2010130227A1
Application number: PCT/CN2010/072785
Authority: WO
Inventors: 褚丽; 宋翠溪; 许玲; 曲红云; 宋建全
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-05-15
Filing date: 2010-05-14
Publication date: 2010-11-18
Also published as: JP5436664B2; CN101888594B; CN101888594A; JP2012527138A

Abstract

A method for releasing a multicasting and broadcasting data path and a system thereof are disclosed. Wherein, the method comprises: the Access Service Network (ASN) originates the releasing of a data path which bears the multicasting and broadcasting service when needed, and notifies the Core Service Network (CSN) to terminate the corresponding multicasting and broadcasting service on the data path. In the invention, the releasing of the data path which bears the multicasting and broadcasting service is originated by the ASN, consequently, the flexibility of the flow is enhanced. The invention applies to various scenarios and saves network resources to the maximum extent.

Description

Method and system for releasing multicast broadcast data channel

TECHNICAL FIELD The present invention relates to mobile multimedia multicast broadcasting technologies, and more particularly to a method and system for releasing multicast broadcast data channels.

Background technique

Multicast broadcast service (MBS or MCBCS) is a widely studied business in the field of wireless communications. When the service is applied, the same radio resource, or the same network resource, can be shared by multiple or all terminals (MS) that receive the service. That is, in a multicast broadcast area, the terminal can receive the same multicast broadcast service. A multicast broadcast area is composed of one or more base stations belonging to the same geographical area, which transmit the same program content and transmit downstream using the same resources. The multicast broadcast system is as shown in FIG. 1, and includes: a multicast broadcast data channel entity (MBS DPF) located in an access network, a multicast broadcast proxy (MBS Proxy), and a multicast broadcast service distribution data channel entity (MBS Distribution DPF). Anchoring the traffic flow authorization entity (Anchor SFA) and the multicast broadcast controller/server (MCBCS Controller/Server) and the AAA server (authentication, authorization and accounting server) located in the core network. In the figure, the CSN is the core network, ASN. For the access network, the access network includes a physical entity base station (BS) and a gateway (ASN-GW), where: a multicast broadcast data channel entity (MBS DPF): is a functional entity in the access network, usually set on the base station , which supports access network multicast broadcast service bearer control management; multicast broadcast proxy (MBS Proxy): is a functional entity in the access network, and is responsible for managing the control plane functional entities related to the multicast broadcast service in the access network. For example: interaction with the core network to support the management of the multicast broadcast service session, allocation of multicast broadcast access parameters, support for multicast broadcast service transmission, and multicast The broadcast distribution data channel entity interacts to control the establishment and maintenance of the multicast broadcast data channel in the multicast broadcast area, and the like; the multicast broadcast service distribution data channel entity (MBS Distribution DPF): is responsible for the functional entity in the access network, responsible for Data surface, for example: Responsible for the distribution of data in the access network, but also responsible for many The broadcast broadcast bearer control management includes performing the establishment, release and maintenance of the data channel, and is also responsible for the management and distribution of the data packet sequence number; anchoring the traffic flow authorization entity (Anchor SFA): being the functional entity in the access network, responsible for Managing a request by a given terminal for a multicast broadcast service, such as: assigning a service flow identifier for a given multicast broadcast service flow of the terminal, supporting establishment, modification, and release of a multicast broadcast service flow, etc.; Proxy, multicast broadcast service distribution data channel entity and anchor service flow authorization entity are usually located in the gateway of the access network; multicast broadcast controller (also known as multicast broadcast server, in this paper, using multicast broadcast control) The form of the device/server, ie MCBCS Controller/Server): is a functional entity in the core network, including all the functional units of the multicast broadcast service in the core network, such as: IP multicast group management, multicast broadcast service program management , multicast broadcast service notification management, multicast broadcast service session management, etc. In the data transmission of the multicast broadcast service, the data channel in the access network serves as a bearer resource and can be used by all terminals participating in the service. For a given multicast broadcast service, once the data channel is established, it is not necessary to additionally establish or re-establish the number of terminals joining the multicast broadcast service. The release of the data channel of the given multicast broadcast service is usually initiated by the core network according to the service characteristics and policies, such as the end time of the service. Specifically, the multicast broadcast server (or the multicast broadcast controller) in the core network notifies the multicast broadcast agent to initiate the release of a certain packet service flow.

SUMMARY OF THE INVENTION In the prior art, the process of releasing a multicast broadcast service data channel initiated by a core network is not flexible enough to cover all scenarios. For example, if the service does not reach the end time, it ends early. At this time, the core network and the access network still retain resources of the service, such as data channel resources, which causes a great waste of resources. The technical problem to be solved by the present invention is to provide a method and system for releasing a multicast broadcast data channel, which can cover all application scenarios and save network resources to the utmost extent. In order to solve the above technical problem, the present invention provides a method for releasing a multicast broadcast data channel, The method includes: the access network initiates release of a data channel for carrying the multicast broadcast service when needed, and notifies the core network to terminate the corresponding multicast broadcast service on the data channel. Preferably, in the step of initiating the release of the data channel for carrying the multicast broadcast service when the access network needs it, when no user participation is involved in all the multicast broadcast services on a data channel, the access network initiates The release of the data channel; or the release of the data channel when the access network finds that the resource is insufficient; or when the access network finds that the multicast broadcast service on the data channel is abnormal, the release of the data channel is initiated. Preferably, the method further includes: determining, by the access network, whether there is user participation in the multicast broadcast service on the data channel, or determining, by the core network, whether the user participates in the multicast broadcast service on the data channel, and The judgment result is notified to the access network. Preferably, in the step of determining, by the access network, whether the user participates, the access network performs judgment when the user exits the multicast broadcast service, or periodically determines; in the step of determining whether the user participates in the core network, the core network is in the user The judgment is made when exiting the multicast broadcast service, or is notified by the access network or periodically. Preferably, in the step of determining whether there is any user participation in the multicast broadcast service on the access network or the core network, determining, by one of the following information, whether the user is still involved: the statistical information of the terminal corresponding to the multicast broadcast service, Terminal information corresponding to the multicast broadcast service. Preferably, in the step of determining, by the terminal information corresponding to the multicast broadcast service, whether there is any user participation on the multicast broadcast service, the access network or the core network determines whether the multicast broadcast service has a corresponding terminal identifier or user. The billing information, if any, is also attended by the user of the multicast broadcast service; otherwise, no user participates. Preferably, the method further includes: The access network determines the multicast broadcast service by one of the following message combinations: a multicast broadcast service transmission area identifier and a packet data stream identifier, a multicast broadcast area identifier and a packet data stream identifier in which the multicast broadcast service is located, and a multicast broadcast area. Identification and connection ID. Preferably, the step of the access network notifying the core network to terminate the corresponding multicast broadcast service on a data channel comprises: the multicast broadcast agent in the access network sending the terminating multicast broadcast to the multicast broadcast controller in the core network Business message. Preferably, in the step of the multicast broadcast agent sending a message for terminating the multicast broadcast service, the multicast broadcast agent uses one of the following messages as a message for terminating the multicast broadcast service: for the access network and the core network The message of the interaction, the newly added message for initiating the multicast broadcast service termination to the multicast broadcast controller; the message used for the interaction between the access network and the core network includes: access interaction message and/or The right to change the message. Preferably, the method further includes: if the corresponding service connection exists between the core network corresponding to the multicast broadcast service and the access network, the access network notifies the core network to terminate the corresponding multicast broadcast on the data channel In the case of the service, the service connection corresponding to the termination of the multicast broadcast service is also initiated to the core network. In order to solve the above technical problem, the present invention provides a system for releasing a multicast broadcast data channel, including an access network and a core network, where: the access network is configured to: initiate a data channel for carrying a multicast broadcast service. Release, and notify the core network to terminate the corresponding multicast broadcast service on the data channel; the core network is configured to: terminate the corresponding multicast broadcast service on the data channel. Advantageously, said access network comprises a multicast broadcast data channel entity, a multicast broadcast agent and a multicast broadcast service distribution data channel entity, said core network comprising a multicast broadcast controller, wherein: said multicast broadcast proxy setting Generating: releasing the data channel when needed, and notifying the multicast broadcast controller to terminate the corresponding multicast broadcast service on the data channel; the multicast broadcast data channel entity is set to: in the multicast broadcast agent or Multicast broadcasting industry Release the data channel under the control of the data channel entity;

The multicast broadcast service distribution data channel entity is configured to: release the data channel under the control of the multicast broadcast agent; the multicast broadcast controller is configured to: terminate the data channel according to the notification of the multicast broadcast agent The corresponding multicast broadcast service. In order to solve the above technical problem, the present invention provides a gateway for an access network, including a multicast broadcast proxy and a multicast broadcast service distribution data channel entity, wherein: the multicast broadcast proxy is configured to: initiate a data channel when needed Release, and notifying the core network to terminate the corresponding multicast broadcast service on the data channel; the multicast broadcast service distribution data channel entity is configured to: release the data channel under the control of the multicast broadcast agent. Preferably, the gateway further includes an anchor service flow authorization entity, where the multicast broadcast agent is further configured to: when no user participation is involved in all multicast broadcast services on a data channel, or the resource channel is insufficient to release the data channel, If the multicast broadcast service on a certain data channel is abnormal, the data channel is released. Preferably, the gateway further includes an anchor service flow authorization entity, where the anchor service flow authorization entity is configured to: send a request message to the multicast broadcast agent to leave the multicast broadcast service, indicating that the terminal will leave the multicast a broadcast service; the multicast broadcast agent is further configured to: after receiving the request message of the multicast broadcast service sent by the anchor service flow authorization entity, update the statistics information of the terminal corresponding to the multicast broadcast service or the The terminal information corresponding to the multicast broadcast service, the multicast broadcast agent determining, according to the statistical information or the terminal information, whether there is any user participation in the multicast broadcast service.

The method of the invention enhances process flexibility, is applicable to various scenarios, and maximizes network resources. 1 is a schematic diagram of a multicast broadcast system; FIG. 2 is a flowchart of releasing a multicast broadcast data channel according to an embodiment of the present invention; FIG. 3 is a flowchart of releasing a multicast broadcast data channel according to Embodiment 3 of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION The inventive concept of the present invention is that the access network can initiate the release of the data channel whenever necessary and notify the core network to terminate the corresponding multicast broadcast service on the data channel. One or more multicast broadcast services can be carried on one data channel. When there is no user participation in all multicast broadcast services (sessions) on a data channel, or when the access network finds insufficient resources, or when the access network discovers that the multicast broadcast service on a certain data channel is abnormal. The access network initiates release of the data channel, and notifies the core network to terminate the corresponding multicast broadcast service on the data channel. The timing of the access network notifying the core network may be after determining that the last multicast broadcast service on the data channel has no user participation, or in the data channel release process corresponding to the initiation of the multicast broadcast service.

Whether or not the user participates in the multicast broadcast service can be judged by the access network through the information saved by itself, or can be notified to the access network after being judged by the core network. The access network or the core network can judge when the user exits a multicast broadcast service, or can set the timer timing. The access network or the core network can determine whether there is any user participation in the multicast broadcast service by using one of the following information: the statistics of the terminal corresponding to the multicast broadcast service (the count value of the number of terminals), and the multicast broadcast service corresponding to the multicast broadcast service. Terminal information, such as terminal identification (MSID), user's charging information, and the like. The statistic information can be used to determine whether there is any user participation in the multicast broadcast service, and the terminal information, such as the terminal identifier or the user charging information, is indirectly determined, if the multicast broadcast service corresponds to the terminal identifier or the user billing. If terminal information such as information is saved, it means that there is user participation, otherwise it means that no user has participated.

The system for implementing the above method is as shown in FIG. 1, and includes: a core network (CSN) and an access network (ASN). The access network is configured to: initiate a release of a data channel for carrying the multicast broadcast service, and notify the core network to terminate the corresponding multicast broadcast service on the data channel; the core network is configured to: terminate the data Corresponding multicast broadcast service on the channel. Further, the access network includes: a multicast broadcast data channel entity (MBS DPF), a multicast broadcast proxy (MBS Proxy), and a multicast broadcast service distribution data channel entity (MBS Distribution DPF), and the core network includes a multicast broadcast controller. /Server (MCBCS Controller/Server), where:

• The multicast broadcast agent is configured to initiate a release of the data channel when needed, and notify the multicast broadcast controller to terminate the corresponding multicast broadcast service on the data channel; if needed: on a data channel There is no user participation in all the multicast broadcast services, or the data channel needs to be released, or the multicast broadcast service on a certain data channel is abnormal. The multicast broadcast agent is further configured to: determine whether a user participates in the multicast broadcast service on a data channel.

• the multicast broadcast data channel entity is configured to: release the data channel under control of the multicast broadcast agent or the multicast broadcast service distribution data channel entity;

• a multicast broadcast service distribution data channel entity configured to: release a data channel under control of the multicast broadcast agent; • the multicast broadcast controller is configured to: terminate the notification according to the notification by the multicast broadcast agent Corresponding multicast broadcast service on the data channel. The multicast broadcast controller is further configured to: determine whether there is user participation in the multicast broadcast service on a certain data channel, and notify the multicast broadcast agent of the judgment result.

Whether or not the user participates in the multicast broadcast service is determined when the user exits a multicast broadcast service, or periodically. Can be done by one of the following messages: The multicast broadcast service pair The statistical information of the terminal and the terminal information corresponding to the multicast broadcast service.

The access network further includes an anchor service flow authorization entity, where the anchor service flow authorization entity is configured to: send a request message to the multicast broadcast agent to leave the multicast broadcast service, indicating that a terminal will leave the multiple Broadcasting the broadcast service; the multicast broadcast agent is further configured to: after receiving the request message for leaving the multicast broadcast service sent by the anchor service flow authorization entity, update the statistics information of the terminal corresponding to the multicast broadcast service or The terminal information corresponding to the multicast broadcast service, the multicast broadcast agent determining, according to the statistical information or the terminal information, whether there is any user participation in the multicast broadcast service.

Correspondingly, the gateway of the access network according to the embodiment of the present invention includes the multicast broadcast agent and the multicast broadcast service distribution data channel entity as described above, and may further include the anchor service flow authorization entity as described above.

The process for releasing the multicast broadcast data channel judged and initiated by the access network according to whether the user participates in the multicast broadcast service on the data channel is as shown in FIG. 2, and includes the following steps: Step 110: Multicast Broadcast Agent (MBS) Proxy) determines that a multicast broadcast service has no user participation, and then terminates the multicast broadcast service (by sending a message for terminating a multicast broadcast service) to the multicast broadcast controller/server (MCBCS Controller/Server); multicast The broadcast agent can periodically determine whether there is a user in a multicast broadcast service, or can determine whether the user is the last user of the multicast broadcast service when a terminal leaves a multicast broadcast service, that is, determine the number of users. Whether there is user participation in the broadcast service. If there is a corresponding service connection between the core network and the access network corresponding to the multicast broadcast service, that is, the corresponding service connection exists between the multicast broadcast controller/server and the multicast broadcast agent, the access network may also Simultaneously initiating to the core network to terminate the service connection corresponding to the multicast broadcast service, that is, The multicast broadcast agent initiates termination of the service connection corresponding to the multicast broadcast service. When the service connection is started at the beginning of the multicast broadcast service, the core network selects a multicast broadcast agent in the access network for the service, and the multicast broadcast service is managed on the relevant control plane of the access network, once selected, The service connection is successfully established. The service connection can also be pre-configured, and if it is pre-configured, the service connection does not need to be terminated. Step 120: The multicast broadcast controller/server terminates the multicast broadcast service, and returns a response message to the multicast broadcast proxy to confirm termination of the multicast broadcast service. If the previous step also includes requesting to terminate the service connection, The multicast broadcast controller/server also terminates the service connection and acknowledges the termination of the service connection in the response message. In step 110 and step 120, the multicast broadcast agent and the multicast broadcast controller/server may pass an existing access interaction message (including an access request message Access Request, an access response message Access Response) or an authentication change message. The interaction message between the access network and the core network, such as the change of authorization (referred to as Co A, including the authentication change request message and the authentication change response message), performs the multicast broadcast service termination interaction, for example, the multicast broadcast proxy sends The access request message or the authentication change request initiates termination of the multicast broadcast service, and the multicast broadcast controller/server sends an access response message or an authentication change response as a response to the termination of the multicast broadcast service; for example, when multicast broadcast The controller/server first sends an access request or an authentication change request. At this time, the multicast broadcast agent may also initiate the termination of the multicast broadcast service by using an access response or an authentication change response. Alternatively, new messages can be reconstructed specifically for initiating and responding to the termination of multicast broadcast services. In the above messages, it is necessary to indicate the terminated multicast broadcast service, that is, the information carrying the multicast broadcast service that needs to be terminated. Step 130: The multicast broadcast agent initiates release of the data channel corresponding to the multicast broadcast service to all base stations in the multicast broadcast area of the multicast broadcast service (the multicast broadcast data channel entity is included in the base station), and the data channel is released. Request message ( Path_Dereg_Req ); When the data channel is allocated for use by multiple multicast broadcast services, the multicast broadcast agent also needs to determine whether there are other activated multicast broadcast services on the data channel, and if not, initiate release . Step 140: After receiving the data channel release request, the multicast broadcast data channel entity of each base station releases the corresponding data channel, and sends a release response cancellation packet to the multicast broadcast agent respectively. ( Path Dereg Rsp ) Confirm the release of this data channel.

The difference between the process of determining the release of the access network by the core network and the process of the first embodiment is that the core network notifies the access network after determining that a multicast broadcast service has no user participation, and the access network The decision is whether to initiate the suspension of the multicast broadcast service or the release of the data channel corresponding to the multicast broadcast service. The core network can also be judged periodically, or when a terminal leaves a multicast broadcast service. The multicast broadcast controller/server or AAA server (authentication, authorization, and accounting server) in the core network can complete the judgment.

The multicast broadcast agent in the access network determines whether there is user participation in a multicast broadcast service according to information stored by itself, and the multicast broadcast agent first determines the multicast broadcast service, and then according to the number of terminals (count value) Or terminal information (terminal identification or user's charging information) or the like to determine whether there is user participation in the multicast broadcast service. The multicast broadcast agent obtains the statistical information and/or the terminal information corresponding to the multicast broadcast service by using the following method, as shown in FIG. 3: Step 310: The anchor service flow authorization entity (Anchor SFA) sends the departure message to the multicast broadcast agent. Broadcasting a service request message (MBS Leave Request), indicating that a terminal will leave the multicast broadcast service; Step 320, after receiving the message, the multicast broadcast agent determines the multicast broadcast service, and updates the saved multicast message. Broadcast terminal information or statistical information related to the service, and send a response message (MBS Leave Response) to the anchor service flow authorization entity. Further, the multicast broadcast agent may determine the multicast broadcast service by one of the following message combinations: a multicast broadcast service transmission area identifier and a packet data stream identifier, and a multicast broadcast area identifier and a packet data stream identifier in which the multicast broadcast service is located , multicast broadcast zone ID and connection ID. In addition, when a user joins a multicast broadcast service, the multicast broadcast agent can also obtain multicast. The statistical information and/or the terminal information corresponding to the broadcast service specifically includes: Step 410: The anchor service flow authorization entity (Anchor SFA) sends a request message (MBS Join Request) to the multicast broadcast agent to join the multicast broadcast service, indicating a certain The terminal will join the multicast broadcast service; Step 420: After receiving the message, the multicast broadcast agent updates the saved terminal information or statistical information related to the multicast broadcast service, and sends a response to the anchor service flow authorization entity. Message (MBS Join Response). Similarly, the multicast broadcast agent can determine the multicast broadcast service by one of the following message combinations: a multicast broadcast service transmission area identifier and a packet data stream identifier, a multicast broadcast area identifier and a packet data stream identifier in which the multicast broadcast service is located. , multicast broadcast zone ID and connection ID.

The multicast broadcast agent may directly realize that the last terminal is about to leave the service by using the information of the corresponding terminal that is saved by the multicast broadcast service or the corresponding terminal of the multicast broadcast service; or The other network entity notifies the multicast broadcast agent or the information related to the multicast broadcast agent of the indication (ie, indicating that the last terminal is about to leave the service, or the multicast broadcast service has no terminal) (to jointly determine the last terminal) Will be leaving the service or the multicast broadcast service has no terminal use), and indirectly realize that the last terminal is about to leave the service or the multicast broadcast service has no terminal use. For the latter, other network entities store information about the corresponding terminal that joins the multicast broadcast service, such as the AAA server of the core network, and may store the service information that the terminal joins because of the charging requirement. The above "last terminal" refers to the terminal that exits the service (stops receiving the service) in the terminal that accepts the multicast broadcast program service, and the terminal may be in an active state or in a power saving mode (sleep mode or idle mode). ).

While the invention has been described in connection with the specific embodiments, the modifications and the modifications Such modifications and variations are considered to be within the scope of the invention and the scope of the appended claims. Industrial Applicability The present invention provides a method and system for releasing a multicast broadcast data channel, which is used by an access network to initiate release of a data channel for carrying a multicast broadcast service, thereby enhancing process flexibility and being applicable to various scenarios. Maximize network resources savings.

Claims

Claim

A method for releasing a multicast broadcast data channel, comprising:

The access network initiates the release of the data channel for carrying the multicast broadcast service when needed, and notifies the core network to terminate the corresponding multicast broadcast service on the data channel.

2. The method of claim 1, wherein: in the step of initiating release of a data channel for carrying a multicast broadcast service when the access network needs it, in all multicast broadcast services on a data channel When no user participates, the access network initiates the release of the data channel; or when the access network finds that the resource is insufficient, the data channel is released; or the access network discovers that the multicast broadcast service on the data channel is abnormal, The release of this data channel.

3. The method according to claim 2, further comprising: determining, by the access network, whether there is user participation in the multicast broadcast service on the data channel, or determining, by the core network, whether there is a multicast broadcast service on the data channel The user participates and informs the access network of the judgment result.

4. The method according to claim 3, wherein: in the step of determining, by the access network, whether the user participates, the access network performs judgment when the user exits the multicast broadcast service, or periodically determines; whether the core network determines whether there is In the step of user participation, the core network judges when the user exits the multicast broadcast service, or is informed by the access network or periodically.

The method according to claim 3 or 4, wherein: in the step of determining whether the user or the user participates in the multicast broadcast service on the access network or the core network, It is judged by one of the following information whether or not the user participates: the statistical information of the terminal corresponding to the multicast broadcast service, and the terminal information corresponding to the multicast broadcast service.

6. The method according to claim 5, wherein: in the step of determining, by the terminal information corresponding to the multicast broadcast service, whether there is any user participation on the multicast broadcast service, the access network or the core network determines the multicast broadcast. Whether the service has a corresponding terminal identifier or user's charging information. If there is, the multicast broadcast service also has user participation. Otherwise, no user participates.

7. The method according to claim 5, further comprising: the access network determining the multicast broadcast service by one of the following message combinations: a multicast broadcast service transmission area identifier and a packet data stream identifier, where the multicast broadcast service is located Broadcast broadcast area identification and packet data flow identification, multicast broadcast area identification and connection identification.

8. The method according to claim 1, wherein: the step of the access network notifying the core network to terminate the corresponding multicast broadcast service on a data channel comprises: the multicast broadcast agent in the access network to the core network The multicast broadcast controller sends a message to terminate the multicast broadcast service.

9. The method of claim 8, wherein: in the step of the multicast broadcast agent transmitting a message terminating the multicast broadcast service, the multicast broadcast agent uses one of the following messages as a message to terminate the multicast broadcast service : a message for interaction between the access network and the core network, a new message for initiating multicast broadcast service termination to the multicast broadcast controller; the message used for interaction between the access network and the core network Including: access interaction message and/or authentication change message.

10. The method according to claim 1, further comprising: if there is a corresponding service connection between the core network corresponding to the multicast broadcast service and the access network Then, when the access network notifies the core network to terminate the corresponding multicast broadcast service on the data channel, it also initiates to the core network to terminate the service connection corresponding to the multicast broadcast service.

A system for releasing a multicast broadcast data channel, comprising an access network and a core network, wherein: the access network is configured to: initiate a release of a data channel for carrying a multicast broadcast service, and notify the core network to terminate Corresponding multicast broadcast service on the data channel; the core network is configured to: terminate the corresponding multicast broadcast service on the data channel.

12. The system of claim 11, the access network comprising a multicast broadcast data channel entity, a multicast broadcast agent, and a multicast broadcast service distribution data channel entity, the core network comprising a multicast broadcast controller, wherein The multicast broadcast agent is configured to: initiate a release of the data channel when needed, and notify the multicast broadcast controller to terminate the corresponding multicast broadcast service on the data channel; the multicast broadcast data channel entity is set to: Freeing the data channel under the control of the multicast broadcast agent or the multicast broadcast service distribution data channel entity;

The multicast broadcast service distribution data channel entity is configured to: release the data channel under the control of the multicast broadcast agent; the multicast broadcast controller is configured to: terminate the data channel according to the notification of the multicast broadcast agent The corresponding multicast broadcast service.

13. A gateway for an access network, comprising: a multicast broadcast agent and a multicast broadcast service distribution data channel entity, wherein: the multicast broadcast agent is configured to: initiate a release of the data channel when needed, and notify the core network Terminating the corresponding multicast broadcast service on the data channel; the multicast broadcast service distribution data channel entity is configured to: release the data channel under the control of the multicast broadcast agent.

14. The gateway of claim 13 further comprising an anchor service flow authorization entity, The multicast broadcast agent is further configured to: when there is no user participation in all the multicast broadcast services on a data channel, or if the resources are insufficient to release the data channel, or the multicast broadcast service on a certain data channel is abnormal, Initiate the release of the data channel.

15. The gateway of claim 13 or 14, further comprising an anchor service flow authorization entity, the anchor service flow authorization entity configured to: send a request message to the multicast broadcast agent to leave the multicast broadcast service, Instructing the terminal to leave the multicast broadcast service; the multicast broadcast agent is further configured to: after receiving the request message for leaving the multicast broadcast service sent by the anchor service flow authorization entity, updating the multicast broadcast service corresponding The statistical information of the terminal or the terminal information corresponding to the multicast broadcast service, the multicast broadcast agent determines, according to the statistical information or the terminal information, whether there is any user participation in the multicast broadcast service.