A D2D mode selection scheme with energy consumption minimization underlaying two-tier heterogeneous cellular networks

Device-to-device (D2D) communication has been regarded as an effective technique for enhancing ultra dense network (UDN) system. However, the energy costs of mobile devices have become a great challenge due to the limited battery lifetime. In this paper, we investigate a two-tier heterogeneous cellular network where the macro tier and small cell tier operate according to a dynamic timedivision duplex (TDD). Based on dynamic TDD which can adjust UL and DL time configurations to accommodate to the traffic asymmetry, we propose a mode selection scheme jointing time allocation, power control to minimize the energy consumption of the mobile devices and the whole network. Simulation results show that the energy consumption can be decreased effectively in D2D mode, and D2D communication area accounts for a large part both in the macro cell and small cell.

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