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UBC Theses and Dissertations

Performance evaluations for multimedia applications over PR-SCTP Wang, Xiao Lei


As multimedia applications over the Internet proliferate, the efficient transport of both the signaling and multimedia data becomes increasingly important. Transmission Control Protocol (TCP) and User Datagram Protocol (UDP), the two most widely used but limited transport protocols, are not well suited to contemporary multimedia applications involving digital voice, audio and video communications. In recent years, a new transport protocol, SCTP, has attracted much attention in the technical community. Compared to TCP and UDP, SCTP is considered to meet the requirements for a wider set of applications. With the extension of the partial reliable SCTP (PR-SCTP), SCTP provides an even more flexible transport service. We propose schemes to effectively apply PR-SCTP to multimedia signaling and real media data. In this thesis, our proposed scheme for multimedia signaling is SIP over PRSCTP. In this scheme, SIP messages are sent with either partial reliable, reliable or unreliable services according to their types and requirements, Both application and transport layer retransmission mechanisms are properly coordinated to efficiently retransmit lost data. Our proposed differentiated services of PR-SCTP are applied to multimedia data. In this scheme, therefore, network resources are used more efficiently by treating media data differently. The performance of SIP over UDP, SCTP and PR-SCTP are compared in the thesis. Simulation results show that, compared with UDP and SCTP, the proposed scheme using PR-SCTP improves the performance of SIP transport under both high and low SIP traffic. The scheme for running multimedia data over PR-SCTP achieves more successful transmissions for high-priority messages in a congested network.

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