On Performance Evaluation of Loss-Based Overload Control Mechanism in Signaling System with SIP Protocol

In this paper, we compare two approaches of deploying a loss-based overload control mechanism in a signaling system with the SIP protocol, hop-by-hop, and end-to-end. For deploying these mechanisms, we propose a simple, non-preemptive priority queueing scheme for a SIP server. In this scheme, overload control messages receive high priority while other signaling messages are served with a low priority. This approach allows effective support of performance of the loss-based overload control mechanism in the system. To get knowledge about advantages of the proposed solution, we compare both approaches (hop-by-hop and end-to-end) with a system without overload control. The measured performance metrics are related to average call setup time and goodput.