Method and network system for establishing conversation in multimedia broadcast multicast service

Abstract

The embodiment of the present invention discloses a method by which a session can be established in a multimedia broadcast multicast service (MBMS). The method includes three steps; firstly, while the session of the multimedia or broadcast service starts the process of Session start, a transmit end sends a session establishing request message to a receive end; secondly, a response message returned by the receive end is received; thirdly, if the returned response message indicates that the session establishment fails because resources are unavailable, then the transmit end resends a session establishing request message to the receive end. Accordingly, the embodiment of the present invention also provides a multimedia broadcast multicast service (MBMS) network system. The technical scheme provided by the present invention can reliably establish a session in the multimedia broadcast multicast service.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method and a network system for establishing a session in a multimedia broadcast multicast service. Background technique [0002] Multimedia Broadcast / Multicast Service MBMS (Multimedia Broadcast / Multicast Service), defined by the 3rd Generation Partnership Project 3GPP (3rd Generation Partnership Project), is used for point-to-multipoint unidirectional multimedia services. MBMS uses the air interface to send multimedia broadcast services to users in the cell through public channels, or to send multicast services subscribed by users to users in the cell in multicast mode, thereby saving air interface resources. The main application of MBMS is the mobile TV service. In addition, it can also support services such as broadcast download and music TV MTV interaction. MBMS is based on the GPRS (General Packet Radio Service) / WCDMA (Wide band Code Division Multiple Access) packe...

AI Technical Summary

Problems solved by technology

[0021] In the prior art MBMS, the connection establishment process between different network element devices is unidirectional, from BM-SC to GGSN, SGSN, BSC / RNC, each network element The devices establish a session between each other in turn. If the establishment of a session between two network element devices fails due to the unavailability of the resources of the downstream network element device, the existing technology does not have a corresponding processing flow to ensure that the connection between the two network element devices Sessions can also be established, even if the resources of subsequent downstream network element devices are available, but because the connection establishment process is unidirectional, as long as the upstream network element device does not initiate a request to the downstream network element device again, the connection between the two network element devices is still The session cannot be established, so that users in the area of ​​the corresponding network element equipment cannot enjoy the MBMS service, so the method for establishing a session in the prior art MBMS is not very reliable, for example, when the GGSN sends the "MBMS Session Start Request" message to the SGSN If the "MBMSSession Start Response" returned by the SGSN to the GGSN indicates that the session establishment fails due to resource unavailability, the existing technology does not have a corresponding processing flow, and the session between the GGSN and the SGSN may not be established all the time, which will cause Subscribers in the service area of ​​the corresponding SGSN cannot receive MBMS sessions

In addition, there are similar problems in establishing sessions between BM-SC and GGSN, and between SGSN and BSC / RNC

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