A call‐state‐based service triggering algorithm for IMS network

Abstract

SUMMARYTo determine the potential signaling traffic reductions, the session establishment procedures were investigated. The investigation showed that the serving call session control function (S-CSCF) is the major bottleneck in IP multimedia subsystem (IMS) network and the existing third-generation partnership project (3GPP) service triggering algorithm (3GPP STA) based on initial filter criteria (iFC) increases largely the end-to-end session setup delay (SSD). To reduce the SSD and improve the system performance, a call-state-based application triggering architecture (CATA) was proposed. In CATA, the call-state-based filter criteria and the call-state-based service triggering algorithm (CSTA) were proposed, and then the modeling of 3GPP STA and CSTA was presented. Theoretical analysis and simulation results showed that the CSTA avoids the additional signaling traffic load of the S-CSCF and application server effectively, which exists in 3GPP STA, reduces the SSD considerably, increases the throughput of the S-CSCF and improves the quality of service of IMS network.