Path Diversity Based Techniques for Resilient Overlay Multimedia Multicast
نویسندگان
چکیده
Network Losses due to congestion and node failures severely impair the performance of multimedia streaming on the Internet. In previous work [14], we proposed a content distribution mechanism based on k-DAGs, a special Directed Acyclic Graph (DAG) with k parents per receiver, exploiting path-diversity and rate-adaptation to improve the performance of multicast multimedia streaming. In this paper, we propose and evaluate two new techniques. In the first scheme, each receiver streams an independent multimedia stream, such as the Forward Error Corrected (FEC) bit-stream or a Multiple Description Coded (MDC) description, from a parent, depending upon the existing error conditions in the network. This simplifies the receiver implementation as no packetpartitioning [5], [14] is required. In the second scheme, we construct multiple interior-node disjoint k-DAGs, and stream mutually exclusive stripes of content on each k-DAG. This improves tolerance to nodefailures [1], [4], as any node is an interior node in at most one of the k-DAGs. Our results show that the proposed techniques are very effective in dealing with packet losses in the network, improving FEC goodput by 20-35% and MDC connectivity by 15-20%.
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