Uplink Resource Allocation in Device-to-Device Communication System

Abstract

In this paper, we study uplink resource allocation problem to maximize the overall system capacity while guaranteeing the signal-to-noise ratio of both D2D users and cellular users (CUs). The optimization problem can be decomposed into two subproblems: power control and channel assignment. We first prove that the objective function of power control problem is a convex function to get the optimal transmit power. Then, we design an optimal selection algorithm for channel assignment. Numerical results reveal the proposed scheme is capable of improving the system’s performance compared with the random selection algorithm.

Joint Uplink and Downlink Resource Allocation for D2D Communications System

“…Constraint (14) guarantees that transmission power of CUs, BS, and D2D pairs are within the maximum limit. Constraints (15) and (16) ensure that each uplink or downlink channel of CU can be shared by at most one D2D pair. Constraint (17) indicates that each D2D can only reuse one uplink or downlink channel.…”

“…One is the uplink resource allocation for D2D communications [12][13][14][15][16][17][18][19][20]. Specifically, in order to achieve the maximum total data transmission rate, different types of methods are proposed, such as range division [12], mode selection [13][14][15], and power control [14,15]. In reference [16], the authors focus on power control and channel assignment for interference coordination between D2D pair and CU in uplink phase.…”

“…However, these methods in references [12][13][14][15][16][17][18][19][20][21] reuse the uplink channel, and in references [21][22][23][24][25][26][27][28] D2D users can share the downlink channel, therefore the total radio spectrum has not been fully utilized. To account for this problem, jointly uplink and downlink channel scheme [29,30] are proposed in cellular networks.…”