Interference-constrained routing over P2P-share enabled multi-hop D2D networks

The exponentially-increasing demands on ubiquitous information exchange have inspired wide research interests and efforts on the 5th Generation (5G) of mobile communications system. Among diverse cutting-edge revolutionary technologies towards 5G networks, device-to-device (D2D) networks, where device nodes can communicate with each other by reusing the cellular network’s spectrum in an underlay fashion. We in this paper propose the interference-constrained routing schemes over peer-to-peer (P2P) share enabled multi-hop D2D networks, where multiple D2D subscribers attempt to download the common data from multiple distributed D2D servers. In particular, we aim at optimizing the average download rate over subscribers subject to the interference constraint for cellular network’s spectrum. We first focus on a typical case with two subscribers, two file servers, and two cellular users. We propose a Routing scheme with Direct P2P-Share (R-DPS), which allows subscribers to distribute their received data to each other via a detoured route. To offer better performances, we develop an improved Routing scheme, named Coverage-based P2P-Share (R-CPS). The R-CPS scheme can effectively make use of the broadcast nature of wireless channels to assure that each selected route can cover the other subscriber, rather than directly pass through them in the R-DPS scheme. We further study the generalized case where the number of subscribers, servers, and cellular users can be arbitrary. Particularly, we propose a Routing scheme with Location-Aware P2P-Share (R-LPS) mechanism, the core idea of which is to find a route passing by or directly through other subscribers. Simulation evaluations demonstrate that our proposed R-DPS and R-CPS schemes for the two-subscriber case and the R-LPS scheme for the generalized case all have the capability to effectively improve the data download rate as compared to the approach without enabling P2P support.