Optimal Operating Condition for Co-located Device-to-Device Paris

Abstract

In device-to-device (D2D) communication, users in close proximity to each other can communicate directly without going through a base station; such direct communication can improve spectral efficiency. However, D2D links may generate high interference to cellular user equipment (UE) located in their communication areas if they use the same channel with the UE for data transmission. D2D communication could also generate interference for each D2D pair when the common wireless medium in a co-located limited area is accessed. Although, to solve this problem, research on reducing or avoiding interference between D2D and cellular UE in network supporting D2D communication was conducted, the interference managements are still not fully studied for between D2D pairs. In this paper, we investigate the problem of D2D pair coexistence in which interference is considered between D2D pairs. By analytically deriving an operating condition for D2D pairs deployed within the same region, we provide a lower bound on the throughput of D2D pair networks and the optimal number of D2D pairs that can coexist.