4.7 Article

Energy Allocation and Cooperation for Energy-Efficient Wireless Two-Tier Networks

Journal

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume 15, Issue 9, Pages 6434-6448

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TWC.2016.2585115

Keywords

Energy-efficiency; energy cooperation; resource allocation; wireless two-tier networks; smart-grid; energy harvesting

Funding

  1. Natural Sciences and Engineering Research Council of Canada [STPGP 463338-14]

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In this paper, we consider the resource allocation in two-tier wireless systems in which small-cell base stations harvest energy from renewable sources in addition to the conventional power grid. Moreover, we assume that each cell has access to an energy storage system with a limited battery capacity. We introduce new mechanisms that enable an efficient allocation of the available energy over time across the network. In doing so, we take into account the time-varying fading channel, the inter-cell interference and the fluctuations of harvested energy. In particular, we propose convergent offline algorithms to maximize the network energy efficiency while satisfying an average sum-rate constraint at each cell. Furthermore, we extend the resource allocation scheme by enabling an energy cooperation between the cells. By cooperating, they can exchange their harvested energy through a smart-grid power infrastructure. Using numerical simulations, we verify the convergence of the proposed algorithms and analyze the efficacy of the resource allocation and energy cooperation schemes.

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