【摘 要】
：
To reduce the potential signaling traffic in IP multimedia subsystem (IMS), the session establishment procedures were investigated. The serving call session con
【机 构】
：
State Key Laboratory of Networking and Switching Technology,Eastcom-BUPT Information Technology Co.
【基金项目】
：
国家杰出青年科学基金;国家重点基础研究发展规划(973计划);教育部新世纪优秀人才支持计划;Development Fund Project for Electronic and Information Industry (Mobile Service and Application System Based on 3G)
论文部分内容阅读
To reduce the potential signaling traffic in IP multimedia subsystem (IMS), the session establishment procedures were investigated. The serving call session control function (S-CSCF) is the major bottleneck in IMS and the existing 3GPP service triggering algorithm (STA) based on initial filter criteria (iFC) increases the end-to-end session setup delay remarkably. To reduce the session setup delay and improve the system performance, a SIP response message based filter criteria (rFC) was proposed. Based on the rFC, a SIP response message based STA (RSTA) was further proposed. The modeling and theoretical analysis of 3GPP STA and RSTA were presented. Simulation results show that, compared with 3GPP STA, the RSTA can avoid the additional signaling traffic load of the S-CSCF and application server (AS) effectively, reduce the session setup delay considerably, increase the throughput of the S-CSCF and improve the quality of service (QoS) of IMS network.
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