Cognitive radio based efficient video multicast in TV white space

The wireless video multicast in TV White Space (TVWS) is a challenging task due to the characteristics of the wireless channels and the video streaming. This paper studies the optimized real-time video multicast in TVWS, and proposes a practical and bandwidth-efficient TVWS video multicast framework. First, a TVWS-based efficient quasi-static spectrum access scheme is employed to reduce the spectrum switch delay. Second, a cross-layer optimized resource scheduling scheme is proposed to further improve the multicast performance, which considers various cross-layer design factors, including scalable video coding, adaptive modulation-coding, to maximize the overall received video quality. Finally, the proposed resource scheduling problem is formulated as a mixed-integer non-linear programming problem. Considering that the video streaming is delay-sensitive, the problem is addressed with a proposed sub-optimal but computational efficient algorithm. The simulation results demonstrate the effectiveness and superiority of the proposed scheme.