Delay Performance of Voice Call Continuity (VCC) for Circuit-Switched to Packet-Switched Domain Transfer

In this paper, we analyze the session initiation protocol (SIP) based delay of voice call continuity (VCC) signaling for circuit-switched (CS) to packet-switched (PS) domain transfer. For the analysis, we consider universal mobile telecommunications system (UMTS) and worldwide interoperability for microwave access (WiMAX) networks. In our delay analysis, we take into account three types of delays: transmission delay, processing delay, and queuing delay. The results show that in low channel rate networks, the main delay of VCC signaling is the delay incurred due to the transmission delay while for high channel rate networks, transmission delay is negligible and the dominant delays are processing and queuing delays.