Bottlenecks elimination and performance enhancements in IMS presence service

Presence service is one of the most important IP Multimedia Subsystem (IMS) services which allow the user to express their availability and willingness to communicate with each other. Several studies have shown that Call Session Control Function (CSCF) may become the bottleneck in the IMS network, but when a crucial IMS service presence service (PS) is combined with the web services (WS), the number of bottlenecks may change or may shift to some other node. In this paper, simulation results have been presented which shows that when PS and WS are combined together then AS and WS may become the performance bottlenecks. The simulation results are then analyzed and compared with the theoretical analysis and they show a good agreement with it. A solution to improve the performance and to eliminate the bottlenecks has been suggested through this paper.