analysis - AN ANALYSIS OF IP MULTIMEDIA SUBSYSTEMS (IMS)...

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A N A NALYSIS O F IP M ULTIMEDIA S UBSYSTEMS (IMS) Lava N. Saleem and Seshadri Mohan University of Arkansas at Little Rock, Little Rock, Arkansas, USA 72204 ABSTRACT This paper analyzes the complexity of IP Multimedia Subsystems (IMS) proposed by 3GPP/3GPP2. Using two different mobility models, the paper provides a methodology to determine the number of accesses to the IMS servers. The analysis considers mobility of users across registration areas, which generates IMS registration requests as well as signaling to IMS Servers due to service requests initiated by users. This analysis is intended to guide network architects and designers in sizing IMS deployments and to help them improve the utilization of IMS systems. ANALYSIS OF IP MULTIMEDIA SUBSYSTEM Recently, carriers have been not only rolling out 3G networks, but also increasingly offering new data and multimedia services. By adopting standards developed by the Internet Engineering Task Force (IETF), the IMS standard is expected to provide a major impetus behind the offering of new services. The goal of IMS is to bring forth the flexibility and power of internet to 3G cellular systems and to evolve cellular networks along their path towards and beyond 3G. Among the services facilitated by IMS are video conferencing, chat, instant messaging, Push-to-Talk. The Session Initiation Protocol (SIP), whose purpose is to handle sessions, forms a major protocol of the IMS standard. SIP facilitates the establishment, modification, and termination of sessions in IMS. Three different servers form the core network of IMS represented by the Proxy-, Interrogating-, and Serving-Call Session Control Function servers (P-CSCF, I-CSCF, S-CSCF). P-CSCF is the first contact in the IMS system
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analysis - AN ANALYSIS OF IP MULTIMEDIA SUBSYSTEMS (IMS)...

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