摘要
To reduce the potential signaling traffic in IP multimedia subsystem （IMS）, the session establishment procedures were investigated. The serving call session eontrol function （S-CSCF） is the major bottleneck in IMS and the existing 3GPP service triggering algorithm （STA） based on initial filter eriteria （iFC） increases the end-to-end session setup delay remarkably. To reduce the session setup delay and improve the system performanee, 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 traffie load of the S-CSCF and application server （AS） effectively, reduce the session setup delay eonsiderably, increase the throughput of the S-CSCF and improve 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.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.
基金
Supported by National Science Fund for Distinguished Young Scholars (No. 60525110)
National Basic Research Program of China (No.2007CB307100, 2007CB307103)
Program for New Century Excellent Talents in University (No. NCET-04-0111 )
Development Fund Project for Electronic and Information Industry (Mobile Service and Application System Based on 3G)
