TMGI GENERATION AND DISTRIBUTION METHOD IN ROAMING STATUS

摘要

A method of generating and assigning TMGI for UE in roaming, the method comprises the steps of: a) UE sends a message to SGSN when joining a multicast group; b) SGSN obtains TMGI of a service from GGSN; c) SGSN modifies a roaming indication bit of the TMGI according to the roaming state of the UE; d) SGSN sends a message to the UE and returns the modified TMGI. In the case where the UE is roaming, it reduces the probability of repeated TMGI assignment, so as to maintain the uniqueness of TMGI well. And it enhances the contents of paging message, so as to allow UE to be able to judge whether it is the paging target.