Mode Switching for Energy-Efficient Device-to-Device Communications in Cellular Networks

Abstract

This paper investigates energy-efficient device-todevice (D2D) communications in cellular networks. We aim to maximize the overall energy-efficiency (EE) of D2D users and regular cellular users (RCUs) while considering the circuit power consumption and the quality-of-service (QoS) requirements for both types of users as well as power constraints. Three transmission modes, namely, dedicated mode, reusing mode, and cellular mode, are considered for D2D users to share spectrum with RCUs. Parametric Dinkelbach method and concave-convex procedure (CCCP) are adopted to transform the original optimization problems into more tractable forms through sequential convex approximations. Then, interior point method is exploited to obtain the optimal solution. Simulation results show that system EE can be improved significantly with the proposed mode switching algorithm compared with the single mode transmission. Besides, it is also shown that the reusing mode is more preferred in the EE based mode switching while it is the dedicated mode in the spectrum-efficiency (SE) based mode switching in most situations.

Resource and energy efficient device to device communications in downlink cellular system

“…Since f cave2 (p) in (29) is differentiable, CCCP can be utilized [15]. The basic idea of CCCP is to iteratively linearize the convex part of the DC objective function, −f cave2 (p) [16].…”

“…The basic idea of CCCP is to iteratively linearize the convex part of the DC objective function, −f cave2 (p) [16]. As in [15], the following iterative updating procedure is used in CCCP algorithm…”

Energy-Efficient Resource and Power Allocation for Underlay Multicast Device-to-Device Transmission

“…Consequently, the above optimization problem in (12) is a non-convex optimization problem which is proved to be a NP-Hard problem and there are no efficient solutions [15]. Moreover, when the problem size increases, the computational complexity also increases exponentially.…”

Mode Selection and Resource Allocation in Device-to-Device Communications With User Arrivals and Departures

“…Dynamic mode selection can capture and utilize the fast fading effects of wireless channels opportunistically, while static mode selection has the advantage of saving computation and communication overhead. The design of mode selection function has to take into account the other two closely related resource control functions, i.e., resource allocation and power control, and the three functions can be either separately [4], [11], [12], [15], [17] or jointly [8], [9], [13], [14], [18] optimized.…”