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中文摘要：
蜂窝网小区内，中继终端的移动性会引起协同中继信道的不稳定，进而造成组播码流的频繁中断．为解决这一问题，提出了一种既能保持协同网络高带宽特性，又能改善组播服务连续性的分层中继组播策略．利用抽象信道模型和非衰减无线信道模型，对满足该策略的分层多节点中继信道的容量进行了分析．理论分析和仿真结果表明，同普通非分层中继网络相比，新策略虽然在信道容量上略有降低，但保证了组播服务的连续性．
英文摘要：
Within cells of cellular system, the mobility of relay terminals causes the cooperative relay channels instability, brings frequent interruptions to multicast stream. To solve this problem, a layered relay muhieast scheme with high-capacity and continuity of multicast service is proposed. Based on a lay- ered abstract model and a non-fading wireless model for satisfying the scheme, the capacity of layered multiple relay channel is studied. Analysis and simulation show that the scheme guarantees the continuity of multicast service when compared with general non-layered relay networks, though it causes a slight loss on capacity.
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