A new IFC-SFC-based dynamic service triggering algorithm for IMS network

The S-CSCF (Serving Call Session Control Function) is the major bottleneck in IMS network and the existing 3GPP (the 3rd Generation Partnership Project) Service Triggering Algorithm (3GPP STA) based on iFC (initial Filter Criteria) increases largely the end to end session setup delay. To reduce the session setup delay and improve the system performance, an implementation of subsequent Filter Criteria (sFC) is proposed. Based on iFC and sFC, a New Dynamic Service Triggering Algorithm (NDSTA) is proposed. And then the performance modeling of 3GPP STA and NDSTA are presented. Theoretical analysis and simulation results show that, NDSTA can efficiently reduce the signaling traffic load of the S-CSCF and Application Server (AS), increase the throughput of the system and considerably reduce the session setup delay, improve IMS network quality of service.