Intra-Cluster Device-to-Device Multicast Algorithm Based on Small World Model

Device-to-Device (D2D) communication has been considered as a promising technique to provide better wireless services in local area. In this paper, we propose an improved intra-cluster D2D multicast protocol to enable data sharing among users. In our scheme, several D2D users take turns to multicast the corresponding packets. The sequence of packet transmissions is determined according to the data demand. In addition, we introduce relay based transmission into the multicast process so as to overcome transmission rate restriction caused by link heterogeneity. Greedy algorithm is applied to select relay nodes inspired by small world phenomenon. Through simulation, we show that the proposed method not only improves the delay performance and capacity gain, but also expands the D2D transmission range.