通信网络中基于协作中继重传策略

Re-transmission strategy based on cooperative relay in communication networks

针对信息包在通信网络中多播传输进行了研究,提出通信网络中基于协作中继重传策略。当信息包直传失败时,源节点协作多个中继节点对多个丢失的信息包进行编码重传。在重传阶段根据反馈机制结果采取随机接入方式优先对有机会编码的丢失信息包进行组合,然后通过牺牲之前重传过程中传输失败的节点为信息提供空间分集增益,从而减少重传次数。最后在不同信道环境下,该策略与未协作NCARQ和传统ARQ进行Monte Carlo仿真。仿真结果表明,在多中继信道条件优于源—目的信道的情况下,利用协作网络编码进行重传有效地提高网络吞吐量,且该策略利用协作空间分集降低了由于相干性而导致性能不佳的状况。

This paper studied the information packets multicast in communication networks,it proposed the re-transmission strategy based on cooperative relay in communication networks( CRRS). When the packet failed to transmit directly,the source node,coordinated with the relaying nodes could encode and then re-transmit lost packets. During re-transmission,those lost packets accessible to encoding would assemble by way of random access according to the results derived from the feedback system. Subsequently,there would provide more spacial diversity gain for information restoration by obsoleting the nodes previously failed to transmit so as to reduce the frequency of the re-transmission. Finally,through diverse information channels,this strategy could simulate with non-coordinated NCARQ and traditional ARQ in Monte Carlo. The simulation results show that,on the condition that multiple relaying channels provide better conditions than source-destination channels,the use of coordination-based network encoding for the purpose of re-transmission will not only effectively promote network throughput capability,but also largely reduce the possibilities of poor performances due to coherence issues by way of coordinated spacial diversity.