NETWORK ADAPTIVE LAYERED MULTICAST FOR HETEROGENEOUS WIRELESS AD HOC NETWORKS
Keywords:
Adaptive Multicast, Wireless networksAbstract
Layered transmission is a promising solution to video multicast over Heterogeneous Wireless Networks. However, since the number of layers is practically limited, noticeable mismatches would occur between the coarse-grained layer subscription levels and the heterogeneous and dynamic rate requirements from the receivers. In this paper, we propose a Network-adaptive Layered Multicast (NALM) approach, that exploits the increasing computing and communications capabilities of wireless devices. We show that by having few multicast nodes (about 10% the number of receivers) to encode and decode the video, an improvement of more than 30% in bandwidth efficiency could be achieved. Furthermore, due to the proximity of such encoding/decoding nodes to the receivers than the source itself, more accurate and faster evaluation of network conditions would be possible leading to faster convergence and further improvement in efficiency.
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