Network coding retransmission method for Cellular and D2D communication based wireless broadcasting

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 D2D broadcast scenario in which devices are equipped with dual interfaces. During the retransmission phase, each device can utilize both cellular and D2D 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 D2D 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.