Abstract
Device-to-device (D2D) communication, as one of the promising candidates for the fifth generation mobile network, can afford effective service of new mobile applications and business models. In this paper, we study the resource management strategies for D2D communication underlying the cellular networks. To cater for green communications, our design goal is to the maximize ergodic energy efficiency (EE) of all D2D links taking into account the fact that it may be tricky for the base station (BS) to receive all the real-time channel state information (CSI) while guaranteeing the stability and the power requirements for D2D links. We formulate the optimization problem which is difficult to resolve directly because of its non-convex nature. Then a novel maximum weighted ergodic energy efficiency (MWEEE) algorithm is proposed to solve the formulated optimization problem which consists of two sub-problems: the power control (PC) sub-problem which can be solved by employing convex optimization theory for both cellular user equipment (CUE) and D2D user equipment (DUE) and the channel allocation (CA) sub-problem which can be solved by obtaining the weighted allocation matrix. In particular, we shed light into the impact on EE metric of D2D communication by revealing the nonlinear power relationship between CUE and DUE and taking the QoS of CUEs into account. Furthermore, simulation results show that our proposed algorithm is superior to the existing algorithms.
Highlights
With the explosive growth of mobile handheld devices which has led to an increasing demand for higher data rates and radio spectrum resources in the past decade, a wireless access world with lower power consumption, lower latency and higher data rates is anticipated
Restricted 2-D Search: This scheme, proposed in [21], discusses the cases of feasible regions depending on magnitudes of the maximum power of cellular user equipment (CUE) and D2D user equipment (DUE)
For the fairness of comparison, the subcarriers are assigned by finding the optimal resource blocks (RBs) which maximize the EE of DUE
Summary
With the explosive growth of mobile handheld devices which has led to an increasing demand for higher data rates and radio spectrum resources in the past decade, a wireless access world with lower power consumption, lower latency and higher data rates is anticipated. By allowing two adjacent user equipments (UEs) to communicate directly rather than through the BS or core network [1,2,3,4], D2D communications, as a key technology for the fifth generation (5G), can bring some benefits such as higher link stability, lower power consumption, improving the edge user communication efficiency and significantly improving spectrum efficiency (SE) which can be achieved by DUEs sharing the licensed spectrum channels with CUEs [5,6]. Sensors 2019, 19, 4799 such as stable establishment of communication links, effective device discovery scheme, implementing communication mode selection and coordinating the interference between primary user equipments and secondary user equipments, i.e., CUEs and DUEs respectively. We focus on the interference management for underlay D2D communication in the cellular network
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