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Now-a-days, multimedia services over wireless networks are increasingly popular. With multicast, many mobile stations can join the same video group and share the same radio resource to efficiently increase frequency utilization. However, users may be located at different positions, and so suffer different degrees of path loss and interference, and receive a different Signal-to-Interference and Noise Ratio (SINR). Users at the cell-edge receiving a lower SINR may degrade the multicast efficiency. In this paper, the authors propose four schemes that consider Fractional Frequency Reuse (FFR) over relay networks in multi-cells.
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