Self-sorted D2D discovery for alleviating in-band emission in LTE networks

Abstract

Proximity service (ProSe) enables the adjacent mobile devices communicate with each other on device to device (D2D) links in the Long Term Evolution Advanced (LTE-A) system. Device neighbor discovery is the first step to the D2D communication. In LTE-A networks, D2D discovery beacons are multiplexed with cellular signal, it will lead to in-band emission interference (IBEI). IBEI will lead to considerable interference to cell UEs uplink control signal. Therefore, reducing the IBEI caused by D2D discovery signal and keeping a high discovery ratio are the objective of discovery algorithm designing. In this paper, we propose a new distributed discovery algorithm named self-sorted (SS) discovery algorithm. First, SS algorithm is motivated by greedy resource block (RB) selection method for keeping a higher discovery ratio. Second, we use self-sorted method for converging the D2D user equipments (DUEs) who will cause severe IBEI transmit discovery beacons in minimum sub-frames such that reducing the impact of IBEI to eNB. Through simulation results, our proposed algorithm is proven to be better than existing distributed D2D discovery algorithm.