Abstract
The delay in transmitting SIP messages over the wireless link for session resetup at handover is still major bottleneck for interactive multimedia service. In this paper, a proxy agent-based scheme is proposed to minimize the SIP session setup delay over a wireless link in 3G inter-subnet handover scenarios. This scheme is based on the two characteristics. One is that the major factor of SIP session re-setup delay is generally caused by the retransmissions in the unreliable wireless links, and the other is that most of the fields in request messages as well as response messages are duplicated when a set of SIP messages are exchanged during session re-setup procedure. In this scheme, no change is required in the SIP message processing except for the proxy agents in both BS and MH.
Highlights
SIP has been used as a signaling protocol for enabling multimedia session management functions in the Internet
All BSs located together with SGSN have proxy agents, which play a significant role in processing SIP session request message triggered by the mobile host (MH) or the corresponding hosts (CHs)
We proposed the proxy agent-based scheme in order to minimize the SIP session re-setup delay over a wireless link in 3G inter-subnet handover scenario
Summary
SIP (session initiation protocol) has been used as a signaling protocol for enabling multimedia session management functions in the Internet It has been considered as an attractive mobility management protocol at application layer for heterogeneous networks. It has been selected as a major protocol in the IMS (IP multimedia subsystem) by the third Generation Partnership Project (3GPP) [1, 2]. Pack and Lee [7] analyze call setup latency analysis in SIP-based voice over WLANs. Munir [8] studies SIP-based signaling delay for IMS session establishment in WiMax and 3G networks.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
