A method for multimedia broadcast multicast service linking for pmm idle mobiles

Abstract

The present invention relates to methods and arrangements for initiating Multimedia Broadcast Multicast Service (MBMS) to User Equipment (UE) in PMM-idle mode controlled by a Radio Network Controller (RNC) connected to a Serving GPRS Support Node (SGSN). The above method in the RNC according to one embodiment comprises the following steps: (a) - instruct the SGSN to transition the UE to circuit switched connected mode; (b) - receive the MBMS UE context from the SGSN; and (c) - add the MBMS UE context in the RNC UE context to let the RNC know that it controls the UE connected to MBMS.

Description

technical field [0001] The invention relates to a mobile telecommunication system. [0002] More particularly, the present invention relates to a method and apparatus for handling Multimedia Broadcast Multicast Service (MBMS) in a third generation mobile telecommunication system. Background technique [0003] Work Item Multimedia Broadcast Multicast Service (MBMS) is being standardized for the R6 (Release 6) version within the 3rd Generation Partnership Project (3GPP). Two working modes are defined in the industry: broadcast mode and multicast mode. The present invention relates to multicast mode. [0004] MBMS can be used, for example, to provide streaming services or download services in a point-to-multipoint manner. That is, instead of each user listening / downloading an individual service, a large number of users utilize the same transmission. In this manner, when the number of users sharing the same service is large, the utilization rate of radio resources can be gre...

AI Technical Summary

Problems solved by technology

[0022] A disadvantage of the second solution is the increased number of PMM-connection states that must be handled by the SGSN

This creates an additional load in the CN

Another disadvantage of the [0023] second solution is the need to handle additional authentication / security procedures in the SGSN

[0024] A disadvantage of the third solution is that it causes some possible delay, since the process starts when the "session start" is received, after all signal transmissions are completed May take some time before

[0025] Another disadvantage is that the third solution requires the UE to always transition to a PMM-connection, thus this implies additional signaling, i.e. at the radio interface as well as at the SGSN and RNC Increased load on the interface between

This solution also has the disadvantage that the transition to PMM-connected mode sometimes requires UE authentication, which results in more Iu and Uu signaling

[0026] Moreover, the third and fourth solutions also have the following disadvantages: in the identification list of the UE in the session start message and already stored in the RNC have valid There is a high processing load in the RNC when cross-checking the identity list of UEs connected by RRC

In addition, the peak load conflicts with the start time of the service, and the RNC may also need to perform counting of MBMS UEs

All of these processes may include Uu signaling that can congest the radio interface

Another disadvantage is that the fourth scheme is more complicated and requires two processes of Uu and MM

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