在双向中继系统(TWRN)中,由于源节点发送到中继节点数据包的时延非对称性,如果将网络编码作为中继节点唯一的传输方式,将会增加系统时延,甚至会导致系统的不稳定.针对双向中继系统在时延非对称条件下的传输问题,构建了一种基于二项分布的分析模型,提出了一种中继擦除协议,并利用马尔科夫过程和概率论分析了系统的平均队列长度、平均逗留时间和编码概率.仿真结果表明,该方法有效改善了系统时延,保证了系统的稳定性.%In a two-way relay network (TWRN), the time delays of the packet from two sources to the nodes are increased due to the asymmetry. Aiming at the problem of transmission under the condition of asymmetric two-way relay network, a binomial distribution model is built up, and a kind of relay-erasure protocol proposed. Based on this model and by using Markov process and relevant knowledge of probability theory, the average queue length of the system, the mean sojourn time, encoding probability and the delay under the constraints of the encoding probability are analyzed. Simulation results indicate that the theoretical analysis is quite consistent with the actual situation.
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