Performance study of IMS signaling plane

The convergence of telecom and Internet are yet to be matured enough to effectively solve the major challenges, like quality of service, different kinds of charging, and security. IP multimedia subsystems (IMS) techniques are one of the strong contenders to solve the above problems by proposing overlay network architecture. It is imperative to find out an optimum network design to support rapidly increasing users efficiently, for signaling and services. Our present work addresses the issues involved in predicting the performance (end-to-end node delay) for signaling in the IMS network. We have implemented IMS-signaling prototype test bed and also did the simulation of the same model. Moreover, we have introduced in this case a rule engine to dynamically alter the call flow direction through different network nodes, to effectively study the performance of the various nodes. Our observed results from the implementation and simulation are close. Furthermore, we found out that amongst the nodes involved in call processing, the maximum delay takes place at serving-call session control function (SCSCF).