Abstract
As two promising candidate techniques for the 5G mobile communication system, device-to-device (D2D) communications and full-duplex communications have drawn significant research interests. Since full-duplex communications are suitable for use in low transmit power scenarios to lower the residual self-interference (SI), while D2D communications work in short distance scenarios which result in low transmit power, it is natural to integrate full-duplex into D2D communications. In this paper, we investigate the power control for full-duplex D2D communications underlaying cellular networks. Specifically, we formulate the power control problem by maximizing the achievable sum-rate of the full-duplex D2D link while fulfilling the minimum rate requirement of the cellular link under the maximum transmit power constraint of the cellular user and D2D users. Two algorithms are proposed to solve the optimization problem. For the first algorithm, we convert the objective function into a concave function based on difference of convex (D. C.) structure and propose an iterative algorithm to solve the optimization problem. For the second algorithm, we consider the received signal-to-interference-plus-noise ratios (SINRs) at the D2D users are high. Based on high-SINR approximation, closed-form optimal solutions are obtained for different boundaries of the feasible region. Numerical results are presented to illustrate the effect of the channel gains and SI cancellation ability on the optimal transmit power and the achievable sum-rate of the full-duplex D2D link.
Highlights
The fifth-generation (5G) mobile communication system, which is expected to be large-scale deployed in the future, has attracted worldwide research interests in recent years [1]–[5]
In [18], the authors proposed a stochastic geometry-based framework for large-scale cellular networks overlaid with full-duplex D2D users that have residual SI and a tunable D2D link distance distribution
The power control problem was formulated by maximizing the achievable sum-rate of the full-duplex D2D link while fulfilling the minimum rate requirement of the cellular link under the maximum transmit power constraint of the cellular user and D2D users
Summary
The fifth-generation (5G) mobile communication system, which is expected to be large-scale deployed in the future, has attracted worldwide research interests in recent years [1]–[5]. In [11], the authors investigated joint resource allocation and power control for maximization of the energy efficiency of D2D communications underlaying cellular networks. Most of the studies on communications focused on half-duplex mode, which means the devices could either receive or transmit. In [18], the authors proposed a stochastic geometry-based framework for large-scale cellular networks overlaid with full-duplex D2D users that have residual SI and a tunable D2D link distance distribution. In [21], the authors investigated the resource allocation problem for multi-user full-duplex underlay D2D communication, considering both perfect channel state information (CSI) and statistical CSI. We investigate the power control for full-duplex D2D communications underlaying cellular networks.
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