Interference Aware Algorithm For D2D Communications Underlay Cellular Network A Mixed Strategy Approach

Abstract

Device to Device D2D communication is recognized as a key technology of the evolving 5G networks. Its main objective is to allow direct communication between proximity devices without routing data via eNodeB. It can take place either overlay or underlay cellular network. In the first case, dedicated Resource Blocks (RBs) are always allocated for D2D communication, leading to an expected waste of spectral resources. While in the second, D2D pairs share common RBs with the residual cellular users, resulting to highly better network performances, such as spectral efficiency, energy efficiency, and coverage extension. But it implies new challenges especially for interference management. For this reason, we will focus in this paper on the design and implementation of an interference aware RB allocation algorithm for D2D communications in order to maximize advantages from its integration in 5G networks without disturbing basic cellular or other D2D communicating pairs. Unlike most of previous game theoretic studies on resource allocation problems considering only pure strategies, firstly we propose a mathematical game theory model for our resource allocation problem as an interpretation of mixed strategy game in normal form and investigate mixed strategy Nash equilibrium (MSNE) points. This concept allows users to adopt more accurate strategies in order to maximize their utilities according to random network specificities. Furthermore we design a distributed spectral efficient resource allocation algorithm, based on interference minimization schema, leading to performance maximization for the entire networks' communication. Finally, we interpret our MSNE points and final RBs allocation table and compare interference factor and spectral efficiency obtained from our algorithm to other previous solutions through computer simulations.