An Energy-Efficient Strategy for Secondary Users in Cooperative Cognitive Radio Networks for Green Communications

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

22 Scopus Citations
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Author(s)

  • Jianqing Liu
  • Haichuan Ding
  • Ying Cai
  • Hao Yue
  • Shigang Chen

Detail(s)

Original languageEnglish
Article number7728034
Pages (from-to)3195-3207
Journal / PublicationIEEE Journal on Selected Areas in Communications
Volume34
Issue number12
Publication statusPublished - 1 Dec 2016
Externally publishedYes

Abstract

In cognitive radio networks (CRNs), primary users (PUs) can leverage secondary users (SUs) as cooperative relays to increase their transmission rates, while SUs will in return obtain more spectrum access opportunities, leading to cooperative CRNs (CCRNs). Prior research works in CCRNs mainly focus on providing ubiquitous access and high throughput for users, but have rarely taken energy efficiency into consideration. Besides, most existing works assume that the SUs are passively selected by PUs regardless of SUs' willingness to help, which is obviously not practical. To address energy issue, this paper proposes an energy-efficient cooperative strategy by leveraging temporal and spatial diversity of the primary network. Specifically, SUs with delay-Tolerant packets can proactively make the cooperative decisions by jointly considering primary channel availability, channel state information, PUs' traffic load, and their own transmission requirements. We formulate this decision-making problem based on the optimal stopping theory to maximize SUs' energy efficiency. We solve this problem using a dynamic programming approach and derive the optimal cooperative policy. Extensive simulations are then conducted to evaluate the performance of our proposed strategy. The results show significant improvements of SUs' energy efficiency compared with existing cooperative schemes, which demonstrate the benefits of our proposed cooperative strategy in conserving energy for SUs.

Research Area(s)

  • cognitive radio networks, cooperative communication, energy efficiency, Green communications, relay selection

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

An Energy-Efficient Strategy for Secondary Users in Cooperative Cognitive Radio Networks for Green Communications. / Liu, Jianqing; Ding, Haichuan; Cai, Ying et al.

In: IEEE Journal on Selected Areas in Communications, Vol. 34, No. 12, 7728034, 01.12.2016, p. 3195-3207.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review