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To reduce the potential signaling traffic in IP multimedia subsystem(IMS),the session establish-ment procedures were investigated.The serving call session control function(S-CSCF)is the major bot-tleneck 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 andimprove the system performance,a SIP response message based filter criteria(rFC)was proposed.Basedon the rFC,a SIP response message based STA(RSTA)was further proposed.The modeling and theoret-ical analysis of 3 GPP STA and RSTA were presented.Simulation results show that,compared with 3 GPPSTA,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 im-prove the quality of service(QoS)of IMS network.
To reduce the potential signaling traffic in IP multimedia subsystem (IMS), the session establish-ment procedures were investigated. The serving call session control function (S-CSCF) is the major bot-tleneck 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 andimprove 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 theoret-ical analysis of 3 GPP STA and RSTA were presented. Simulation results show that, compared with 3 GPPSTA, the RSTA can avoid the additional signaling traffic load of the S-CSCF and application server (AS) effectively reduce the session setup delay delay, increase the throughput of the S-CSCF and im-prove the quality of service (QoS) of IMS network.