Network-Coded Relaying in Multiuser Multicast D2D Network

Mingjun Dai,Hongwei Liu,Hui Wang,Shengli Zhang,Li Zhang,Bin Chen,Xiaohui Lin

doi:10.1155/2014/589794

Mingjun Dai, Hongwei Liu + Show 5 more

Open Access

https://doi.org/10.1155/2014/589794

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Abstract

D2D communication trades short-range communication for achieving high communication rate and short communication latency. Relay aided D2D communication can further tackle the problem of intermediate obstacles blocking the communication. In this work, multidevice multicast communication via a layer of parallel relay nodes is considered. Two relaying strategies, respectively, called the conventional relaying (CR) and network-coded relaying (NCR), are proposed. The throughput of these two schemes is analytically derived and evaluated through numerical study. Theoretically, NCR shows advantage over CR in twofold: one is higher throughput and the other is requiring less relay nodes and, hence, consuming less aggregate power. Numerical studies verify the analysis and show that the throughput performance gap between the two schemes increases significantly, actually exponentially with the number of devices.

Highlights

The main idea of D2D communication is to use short-range communication to trade for high rate communication, short delivery latency, and low aggregate consumption power [1,2,3]
We propose a method based on network-coded multicast relaying (NCMCR)
We first derive the achievable rate region obtained by conventional multicast relaying (CMCR) and refined network-coded multicast relaying (RNCMCR), respectively

Summary

Introduction

The main idea of D2D communication is to use short-range communication to trade for high rate communication, short delivery latency, and low aggregate consumption power [1,2,3]. We investigate a more general and practical model by considering the scenario where multiple devices exchange information via a layer of intermediate relays, namely, relay-aided D2D multicasting communication. For this model, we propose two relaying protocols based on the physical-layer and NC technique, respectively. The most desirable feature of NCMCR is that the interference can be reduced to some extent, since more devices’ signals are decoded at each relay and less devices’ signals are treated as interference This does not involve power allocation among the information streams at each relay node, which embodies NC’s advantage over the physical relaying technique

System Model

Proposed Transmission Protocols

Numerical Study

Conclusion