D2D网络中基于机会网络编码的重传方法研究

Retransmission Method based on Opportunity Network Coding in D2D Networks

针对D2D无线网络中多终端的数据重传问题,研究了结合蜂窝与D2D链路的机会网络编码重传方法。在无线网络编码广播场景下,假设终端设备间彼此靠近且均配有双接口,那么在重传阶段可以同时结合蜂窝与D2D链路来恢复丢失的数据信息。为了能够最大程度化地削减重传次数,合理地进行编码调度,针对机会网络编码策略下的结合蜂窝与D2D链路的场景,提出了一种结合启发式编码算法的双接口重传方式。仿真结果表明,与传统的方式相比,所提方式可以进一步削减D2D无线网络的重传次数、进而有效地提高重传效率。

Aiming at the multi-terminal data retransmission problem in D2D wireless network,an opportunistic network coding retransmission method combining cellular and D2D links is discussed.In the wireless network coded broadcast scenario,assuming that the terminal devices are close to each other and both are equipped with dual interfaces,the lost data information may be recovered by combining simultaneously the cellular and D2D links in the retransmission phase.In order to minimize the number of retransmissions and reasonably perform coding scheduling,a dual interface retransmission method combining heuristic coding algorithm is proposed for the scenario of combining cellular and D2D links under the opportunistic network coding strategy.The simulation results indicate that compared with the traditional method,the proposed method can further reduce the retransmission number of D2D wireless network and effectively improve the retransmission efficiency.