联合蜂窝与D2D链路的网络编码广播重传方案

Network Coding Retransmission Method for Cellular and D2D Communication Based Wireless Broadcasting

移动设备之间的合作以及利用蜂窝和D2D链路等多个接口有望满足日益增长的吞吐量需求。考虑设备配备有双接口的网络编码广播(Network coding for dual interfaces,NCDI)场景,重传阶段,设备同时利用蜂窝与D2D链路来恢复丢失数据包。然而,如何合理的进行编码调度,充分发挥网络编码增益显得至关重要。为最小化重传次数,文章旨在设计联合蜂窝与D2D链路的网络编码广播重传方案。针对随机线性网络编码(RLNC)与立即可译网络编码(IDNC),分别提出了NCDI-RLNC以及NCDI-IDNC方案。仿真结果表明,与其他方案相比,提出的两种方案均能够有效地提高重传效率、减少重传次数。

Cooperation among mobile devices and utilization of multiple interfaces,such as cellular and local area links,are promising to meet the growing throughput demand over cellular links. Consider a wireless D2 D broadcast scenario in which devices are equipped with dual interfaces. During the retransmission phase,each device can utilize both cellular and D2 D links to recover lost packets. However,it is crucial to make reasonable coding schedule and give full play to the network coding gain. In order to minimize the retransmission times,this paper aims to design network coding retransmission schemes for joint cellular and D2 D link scheduling. For random linear network coding（ RLNC） and instantly decodable network coding（ IDNC）,we develop NCDI-RLNC scheme and NCDI-IDNC scheme respectively. Simulation results show that our proposed schemes significantly reduce the retransmission times compared with others.