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1引言自3GPP在2002年R5版本中提出第一个全IP的核心网——IMS (IP Multimedia Subsystem,IP多媒体子系统)架构以来,经过R6、R7版本的逐步细化,IMS已经成为NGN研究的一个热点,并得到了ITU、ETSI TISPAN和3GPP2等标准组织的广泛认可。
1 Introduction Since 3GPP put forward the first all-IP core network (IP Multimedia Subsystem) architecture in R5 of 2002, after the gradual refinement of R6 and R7 versions, IMS has become an NGN research Has been widely recognized by ITU, ETSI TISPAN and 3GPP2 standards organizations.