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, the connection establishment process between different network element devices in MBMS is unidirectional. From BM-SC to GGSN, SGSN, BSC / RNC, each network element device establishes a session with each other in turn. If two network element devices When the establishment of a session fails due to the unavailability of the resources of the downstream network element equipment, there is no corresponding processing procedure in the existing technology to ensure that the session can still be established between the two network element equipment, even if the subsequent downstream network element equipment resources are available, However, 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, a session cannot be established between the two network element devices, resulting in users in the area of ​​the corresponding network element device always MBMS services cannot be enjoyed, so the method for establishing a session in MBMS in the prior art is not very reliable. For example, after the GGSN sends the "MBMS Session Start Request" message to the SGSN, if the "MBMS Session Start Response" returned by the SGSN to the GGSN indicates that the reason is When resources are unavailable and session establishment fails, the existing technology does not have a corresponding processing procedure, and the session between the GGSN and the SGSN may not be established all the time, which will cause users in the corresponding SGSN service area to be unable to receive the MBMS session

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

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