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MS是3GPP在Release 5版本提出的支持IP多媒体业务的子系统,其核心特点是采用SIP协议和与接入的无关性。就IMS支持SIP协议和与接入的无关性,在带宽资源有限的情况下针对窄带无线用户接入IMS,重点提出了一种典型的无线接入控制技术,并详细分析其在系统中的位置、框架结构、系统结构、接口定义以及典型功能的实现方式。
MS is a subsystem supported by 3GPP in Release 5 that supports IP multimedia services. Its core features are the SIP protocol and access independence. In view of IMS’s support of SIP protocol and its independence from access, this paper proposes a typical wireless access control technology for narrow-band wireless users accessing IMS with limited bandwidth resources, and analyzes its position in the system , Frame structure, system structure, interface definition, and how to implement typical functions.