Energy-Efficient Resource Allocation in OFDMA Networks

The widespread application of multimedia wireless services and requirement of ubiquitous access have triggered rapidly booming energy consumption at both the base station side. Hence, energy-efficient design in wireless networks is very important and is becoming an inevitable trend. In this paper, we study energy-efficient resource allocation in downlink cellular OFDMA networks. For the downlink transmission, the weighted energy efficiency (EE) is maximized under certain prescribed per-user quality- of-service (QoS) requirements. We first obtain the optimal solution then propose a suboptimal approach by exploring the inherent structure and property of the energy-efficient design to reduce complexity. Simulation results show that the energy-efficient design greatly improves EE compared with that of the conventional spectral-efficient design and our low- complexity suboptimal approaches can achieve promising tradeoff between performance and complexity.

I. Introduction

With the explosive growth of high-data-rate wireless services and requirement of ubiquitous access, energy consumption of wireless devices is also rapidly increasing. High-level energy consumption at the base station side usually results in a large operational expenditure [1]. Therefore, energy-efficient design in wireless networks is becoming increasingly important and prompting new waves of research and standard development activities [2].