With the rapid advance in multimedia streaming and multicast transport technology, current IP multicast protocols, especially PIM-SM, become the major channel delivery mechanism for IPTV system over Internet. The goals for IPTV service are to provide two-way interactive services for viewers to select popular program channel with high quality for watching during fast channel surfing period. However, existing IP multicast protocol cannot meet above QoS requirements for IPTV applications between media server and subscribers. Therefore, we propose a cooperative scheme of hybrid-tree based on explicit routed multicast, called as HT-ERM to combine the advantages of shared tree and source tree for QoS-supported IPTV service. To increase network utilization, the constrained shortest path first (CSPF) routing algorithm is designed for construction of hybrid tree to deliver the high-quality video stream over watching channel and standard quality over surfing channel. Furthermore, the Resource Reservation Protocol- Traffic Engineering (RSVP-TE) is used as signaling mechanism to set up QoS path for multicast channel admission control. Our simulation results demonstrated that the proposed HT-ERM scheme outperforms other multicast QoS-based delivery scheme in terms of channel switching delay, resource utilization, and blocking ratio for IPTV service. 1. Introduction As the rapid growth of broadband network applications with streaming transport over Internet, the Internet Protocol Television (IPTV) system has been widely deployed to provide multimedia service anywhere at any time. This is because IPTV enables digital service convergence of communications, computing, and media content over IP network with desired QoS guarantee [1]. From the perspective of the quality of experience (QoE), IPTV system operates as the same with broadcasting TV service, which would deliver the watching and surfing programs over different channels. However, the most difference is that IPTV works in a two-way interactive communications between service providers and subscribers. We need to consider the effective channel and delivery control problem to achieve video streaming with desired quality over Internet. To efficiently satisfy multiple viewers’ own quality requirements, IP multicast is considered a promising solution for IPTV application. Nevertheless, quality of service (QoS) support to IPTV system still poses challenging issues for multicast channel delivery and resource utilization through IP networks. The QoS-supported IPTV multicast service architecture is to deploy an efficient
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