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International Journal of Antennas and Propagation
Volume 2013 (2013), Article ID 231794, 7 pages
http://dx.doi.org/10.1155/2013/231794
Research Article

High Energy Efficient Heterogeneous Networks: Cooperative and Cognitive Techniques

1Department of Management Science and Engineering, School of Economics and Management, Tsinghua University, ShuangQing Road 30, Beijing 100084, China
2Key Laboratory of Universal Wireless Communications of Ministry of Education, Wireless Signal Processing & Network Lab, Beijing University of Posts and Telecommunications, XiTuCheng Road 10, Beijing 100876, China

Received 7 November 2013; Revised 23 November 2013; Accepted 29 November 2013

Academic Editor: Xiang Zhang

Copyright © 2013 Heng Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Heterogeneous network (HetNet) is considered as the main and eminent future communication technology, since it achieves high spectral efficiency per unit area and saves energy due to low transmission power. Mass deployment of small cells in cochannel mode increases overall system capacity, but it is also coupled with greater risk of cochannel interference. This paper overviews the interference model based on the Poisson point process (PPP) and analyzes the performance in terms of energy efficiency in multitier HetNet. As the promising solution for improving the performance of HetNet, both the cooperative communication and cognitive radio techniques to mitigate the interference in HetNet are surveyed. As one example of cooperative communication techniques, a hierarchical cooperation scheme on the spectrum allocation is presented and its energy efficiency performance is analyzed and evaluated. Meanwhile, the energy efficiency increases from the cognitive radio technique are demonstrated as well. The energy efficiency performance comparison between the presented cooperative communication and cognitive radio techniques is emphasized, which suggests that the cooperation communication technique is preferred to suppress the interference and increase the energy efficiency in HetNets.