With the rapid advance in multimedia streaming and multicast transport technology, current IP multicast protocols, especially\r\nPIM-SM, become the major channel delivery mechanism for IPTV system over Internet. The goals for IPTV service are to provide\r\ntwo-way interactive services for viewers to select popular program channel with high quality for watching during fast channel\r\nsurfing period.However, existing IPmulticast protocol cannot meet above QoS requirements for IPTV applications between media\r\nserver and subscribers. Therefore, we propose a cooperative scheme of hybrid-tree based on explicit routedmulticast, called as HTERM\r\nto combine the advantages of shared tree and source tree for QoS-supported IPTV service. To increase network utilization,\r\nthe constrained shortest path first (CSPF) routing algorithm is designed for construction of hybrid tree to deliver the high-quality\r\nvideo stream over watching channel and standard quality over surfing channel. Furthermore, the Resource Reservation Protocol-\r\nTraffic Engineering (RSVP-TE) is used as signaling mechanism to set up QoS path for multicast channel admission control. Our\r\nsimulation results demonstrated that the proposed HT-ERM scheme outperforms other multicast QoS-based delivery scheme in\r\nterms of channel switching delay, resource utilization, and blocking ratio for IPTV service.
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