Abstract
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.
Highlights
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
To improve performance of quality of service (QoS)-supported IPTV multicast channel, our hybrid-tree-based explicit routed multicast (HT-ERM) routing algorithm is designed based on constrained shortest path first (CSPF) [8], and HT-ERM channel admission control is employed by Reservation ProtocolTraffic Engineering (RSVP-TE) mechanism [9]
We found that the number of multicast forwarding entries for HT-ERM is increasing largely from 3,199 to 6,301 in condition of high definition (HD) QoS stream distribution ratio (β = 0.2) and multicast channel switching ratio (α = 0.8, 0.5 and 0.25), when group joining member requests are more than 5000 times
Summary
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. The QoS-supported IPTV multicast service architecture is to deploy an efficient multicast transmission system via IP multicast delivery tree with the integration of resource provisioning and channel admission control. The typical PIM protocols are represented by source specific multicast (SSM) [5], and PIM-sparse mode (SM) [6] Those two multicast protocols are integrated by QoS routing algorithm with traffic control to construct source tree, shared tree, and even hybrid-tree structures. Existing core functionality of PIMSM protocol in rendezvous point (RP) node still lacks the efficient control mechanism for hybrid-tree switchover operations to realize IPTV QoS multicast during channel change period. To improve performance of QoS-supported IPTV multicast channel, our HT-ERM routing algorithm is designed based on constrained shortest path first (CSPF) [8], and HT-ERM channel admission control is employed by RSVP-TE mechanism [9].
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