Rateless Code Based Opportunistic Multicasting over Cognitive Radio Networks

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Cognitive Radio (CR) represents an exciting new paradigm on spectrum utilization and potentially more bandwidth for exploding multimedia traffic. The authors focus on the layer encoded video multicast problem over CR and contribute an opportunistic multicasting framework, based on rateless Forward Error Correction (FEC) codes, a mechanism for adaptation of data fragment size to improve transmission efficiency, a joint Secondary Channel (SC) and video data selection algorithm. By adapting fragment size, tracking video group receiving rate, and adapting transmission parameters, they are able to realize the opportunistic multicasting advantage in a challenging CR environment.