Voice over IP
IP telephony: packet-based multimedia communications systems
IP telephony: packet-based multimedia communications systems
Voice QoS in third-generation mobile systems
IEEE Journal on Selected Areas in Communications
Optimal routing for SIP-based session set up over IMS in mobile environment
International Journal of Internet Protocol Technology
Benchmark of middleware protocols for application and service interaction
Proceedings of the 7th International Conference on Mobile and Ubiquitous Multimedia
Analysis and measurement of session setup delay and jitter in VoWLAN using composite metrics
Proceedings of the 7th International Conference on Mobile and Ubiquitous Multimedia
Quality of protection analysis and performance modeling in IP multimedia subsystem
Computer Communications
FIE'09 Proceedings of the 39th IEEE international conference on Frontiers in education conference
Performance enhancement of signaling compression in IP multimedia subsystem
ISCIT'09 Proceedings of the 9th international conference on Communications and information technologies
A group based service triggering algorithm for IMS network
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Minimizing SIP session re-setup delay over wireless link in 3G handover scenarios
EURASIP Journal on Wireless Communications and Networking
Evaluating extensions to IMS session setup for multicast-based many-to-many services
Computer Networks: The International Journal of Computer and Telecommunications Networking
Analysis of Ongoing SIP Session with Resource Reservation in Vertical Handover Scenario
Wireless Personal Communications: An International Journal
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Wireless networks beyond 2G aim at supporting real-time applications such as VoIP. Before a user can start a VoIP session, the end-user terminal has to establish the session using signaling protocols such as H.323 and session initiation protocol (SIP) in order to negotiate media parameters. The time interval to perform the session setup is called the session setup time. It can be affected by the quality of the wireless link, measured in terms of frame error rate (FER), which can result in retransmissions of packets lost and can lengthen the session setup time. Therefore, such protocols should have a session setup time optimized against loss. One way to do so is by choosing the appropriate retransmission timer and the underlying protocols. In this paper, we focus on SIP session setup delay and propose optimizing it using an adaptive retransmission timer. We also evaluate SIP session setup performances with various underlying protocols (transport control protocol (TCP), user datagram protocol (UDP), radio link protocols (RLPs)) as a function of the FER. For 19.2 Kbps channel, the SIP session setup time can be up to 6.12s with UDP and 7s with TCP when the FER is up to 10 percent. The use of RLP (1, 2, 3) and RLP (1, 1, 1, 1, 1, 1) puts the session setup time down to 3.4s under UDP and 4s under TCP for the same FER and the same channel bandwidth. We also compare SIP and H.323 performances using an adaptive retransmission timer: SIP outperforms H.323, especially for a FER higher than 2 percent.