A Relay-based Video Multicast Scheme with Network Coding over Multi-rate Wireless Networks
Date Issued
2010
Date
2010
Author(s)
Lee, Su-Ting
Abstract
Multi-rate video multicast is a effective way to provide streaming video service to many clients. However, it can be a challenging problem over wireless networks because of the heterogeneity of channel condition. Most of prior works focus on the rate-adaptation to improve QoS of such issue; however, all of them focus on the one-hop manner and do not explore the possibility of multiple hops. We present a relay-based scheme such that nodes with better channel condition can forward data to nodes with worse channel condition. First we introduce a time scheduling problem and formulate two optimization models to schedule relays. The throughput-based model schedules the transmission time of each node to maximize total throughput, and the quality-based model describes the problem more specifically through exploring which frames should be transmitted by which nodes to maximize the total visual quality. However, solving the quality-based model is NP-hard, hence we apply the throughput-based model for cost-efficiency. Then we describe a network coding scheme to avoid packet duplication. Simulation results show that the relay-based scheme improve the visual quality by up to 6 db, as compared with the one-hop optimal scheme.
Subjects
video multicast
multi-rate
rate-adaptation
relay-based
network coding
Type
thesis
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