Interference‐aware resource sharing in D2D underlaying LTE‐A networks

Abstract

AbstractIn a device‐to‐device (D2D) underlaying cellular system, intra‐cell interference is no longer negligible, and such interference exists for sharing both uplink (UL) and downlink (DL) resources. This work presents a power and Physical Resource Blocks (PRBs) allocation algorithm to coordinate UL and DL interference in the D2D underlaying Long‐Term Evolution‐Advanced (LTE‐A) network. The objective is to find an effective and efficient mechanism to mitigate the interference between the two subsystems while maximising the weighted sum throughput. This optimisation problem is formulated as a mixed integer nonlinear programming, which is further decomposed into PRBs assignment and transmission power allocation. Analysis reveals that the proposed PRBs allocation strategy is energy‐efficient, and it suppresses the interference not only suffered by the LTE‐A system but also to the D2D users. In another side, the optimal power allocation is resolved by using a low‐complexity technique, and results show the optimal power resides in one of at most four feasible power vectors. Specifically, the scenario of applying partial channel state information (CSI) is also taken into account in our study. Simulations prove that the optimal power allocation combined with the proposed PRBs assignment achieves higher weighted sum throughput as compared with traditional algorithms, even when partial CSI is utilised. Copyright © 2015 John Wiley & Sons, Ltd.