Abstract
Hybrid networks consisting of both millimeter wave (mmWave) and microwave $(\mu W)$ capabilities are strongly contested for next-generation cellular communications. A similar avenue of current research is device-to-device (D2D) communications, where users establish direct links with each other rather than using central base stations. However, a hybrid network, where D2D transmissions coexist, requires special attention in terms of efficient resource allocation. This paper investigates dynamic resource sharing between network entities in a downlink transmission scheme to maximize energy efficiency (EE) of the cellular users (CUs) served by either $(\mu W)$ macrocells or mmWave small cells while maintaining a minimum quality-of-service (QoS) for the D2D users. To address this problem, first, a self-adaptive power control mechanism for the D2D pairs is formulated, subject to an interference threshold for the CUs while satisfying their minimum QoS level. Subsequently, an EE optimization problem, which is aimed at maximizing the EE for both CUs and D2D pairs, has been solved. Simulation results demonstrate the effectiveness of our proposed algorithm, which studies the inherent tradeoffs between system EE, system sum rate, and outage probability for various QoS levels and varying densities of D2D pairs and CUs.
Highlights
The generation wireless technology will consist of a mixture of network tiers of different sizes, transmission power levels, backhaul capabilities, and radio access technologies (RATs) [2], [3]
In order to enhance the QoS of cellular users (CUs) a dynamic power control strategy has been proposed for D2D pairs to satisfy a predefined interference threshold
5G networks are anticipated to provide enhanced data rates and seamless connectivity, they pose critical challenges related to the resource allocation between various network entities
Summary
The generation wireless technology will consist of a mixture of network tiers of different sizes, transmission power levels, backhaul capabilities, and radio access technologies (RATs) [2], [3]. A. APPROACH AND CONTRIBUTIONS In this paper, we consider a network of multiple radio access technologies (RATs) where D2D pairs can share resources with CUs. in order to enhance the QoS of CUs a dynamic power control strategy has been proposed for D2D pairs to satisfy a predefined interference threshold. It is worthwhile to note that the original problem proposes to maximize the EE of both CUs and D2D pairs It has been broken down into two independent subproblems, i.e., the the radio resource management of D2D pairs in order to satisfy their minimum QoS, and the predefined interference threshold set for the CUs. In the second subproblem, we aim to jointly optimize the two conflicting objectives, i.e., maximizing the system EE and maximizing the system sum rate, in light of the resource allocation to the D2D pairs.
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