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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.
In the cell of cellular network, the mobility of the relay terminal will cause the instability of the cooperative relay channel, and then cause the frequent interruption of the multicast stream.In order to solve this problem, a new method is proposed to maintain the high bandwidth of the cooperative network, But also improve the multicast service continuity of the hierarchical relay multicast strategy.Using the abstract channel model and non-decaying wireless channel model, the capacity of the hierarchical multi-node relay channel that meets this strategy is analyzed.Statistical analysis and simulation The result shows that compared with ordinary non-hierarchical relay networks, the new strategy has a slight decrease in channel capacity, but ensures the continuity of multicast services.