An Experimentation Testbed For Scalable Video Coding On IMS-Based IPTV

Nowadays IPTV services are gaining more and more attention from both providers and end users as the development of IP multimedia service and wideband technology. There is a large effort toward the integration of these services into emerging next generation network architectures. In particular, one of the most relevant solutions is being proposed by ETSI-TISPAN and is based on the IP multimedia subsystem. IMS based IPTV platform is service platform architecture which is able to provide IPTV services controlled and handled by IMS core subsystem and delivered independently from underlying IP transport networks. It specifies IPTV functions supported by the IMS subsystem and employs these functions to allow reused IMS functions and also make service initiation and control based on SIP (Session Initiation Protocol). However, in a NGN network, One of the key features of the IMS framework is the ability to interconnect different access networks. This complicates IPTV services since different access networks have differing amounts of bandwidth available, and varying client capabilities of the terminals connecting to these networks place restrictions on various content parameters, e.g. video spatial resolution and bit-rate. Adaption of multimedia content is therefore required in order to support these different access networks and client terminals.Based on Joint Scalable Video Model and UCT Advanced IPTV open source platform, We have designed SIP session procedure, which includes four parts:user registration, service selection, session establishment and session update. We also completed SIP signaling interaction and negotiated QoS parameters between users and providers so that we can introduce Scalable Video Coding on IMS based IPTV, according to different access network characteristics and different client terminal devices, we transmit scalable video to some certain user which is in terms of temporal, spatial and quality domain. We have comprised different dynamic transmission and coding efficiency curves between SVC and Non-SVC. Scalable video coding is a very hot topic which foreshow the future of video delivery, which is a highly attractive solution to the problems posed by the characteristics of modern video transmission systems. The term "scalability" refers to the removal of parts of the video bit stream in order to adapt it to the various needs or preferences of end users as well as to varying terminal capabilities or network conditions. Hence, SVC provides functionalities such as graceful degradation in lossy transmission environments as well as bit rate, format, and power adaptation. These functionalities provide enhancements to transmission and storage applications.We can see from simulation results, when there is a low bandwidth, the quality of Non-SVC is too poor to be transmitted, however, when the transmitted bandwidth is more than the bandwidth of basic layer, SVC video can be transmitted normally, and the more of the bandwidth the better of video quality. After a series of testing work, we also prove that SVC on IMS-based IPTV testbed has well endurance ability of call establishment and maintenance ability of long time call, and the call quality of IPTV service on this testbed is guaranteed. The performance of this improvement testbed is stable.