A SIP Signaling Retransmission Scheme for Efficient Mobile IPTV Service over 3G Wireless Networks

The rapid advancement of mobile communication technologies recently has led to the advent of mobile IPTV service. For a variety of multimedia services, a process of session setup using SIP (session initiation protocol) is required. However, high frame error rate (FER) of typical wireless network causes failure and delay in session setup. In this paper we propose a new scheme minimizing the session setup delay. The proposed scheme estimates the congestion probability by analyzing the FERs of successive transmissions. Through this, the retransmission timer interval (RTI) is set to minimize the session setup delay time. Computer simulation confirmed that the proposed scheme significantly reduces the setup time by properly adjusting the RTI in the rapidly changing wireless network in comparison to the previously proposed retransmission scheme.