Energy-Aware Wireless Relay Selection in Load-Coupled OFDMA Cellular Networks

TL;DR

This paper addresses energy-efficient relay selection in load-coupled OFDMA cellular networks, proving NP-hardness and proposing an effective algorithm that significantly reduces transmission energy while considering cell load impacts.

Contribution

It introduces a novel load-aware relay selection approach, proves its computational complexity, and provides a partial optimality condition to guide algorithm design.

Findings

The proposed algorithm achieves high energy savings.

Load considerations improve relay selection effectiveness.

NP-hardness of the problem is formally proven.

Abstract

We investigate transmission energy minimization via optimizing wireless relay selection in orthogonal-frequency-division multiple access (OFDMA) networks. We take into account the impact of the load of cells on transmission energy. We prove the NP-hardness of the energy-aware wireless relay selection problem. To tackle the computational complexity, a partial optimality condition is derived for providing insights in respect of designing an effective and efficient algorithm. Numerical results show that the resulting algorithm achieves high energy performance.