Relay selection from a battery energy efficiency perspective

Wenshu Zhang, Dongliang Duan, Liuqing Yang

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


The battery nonlinearity has never been considered for energy analysis in relay networks. In this letter, we adopt the realistic nonlinear battery model, apply the battery energy consumption results in to general relay networks, investigate the optimum and suboptimum energy allocation solutions for relaying transmission, and establish the relay selection criterion from the battery energy efficiency perspective. Our analyses and comparisons show that relaying does not always increase the system energy efficiency. We further establish closed-form conditions that can be easily checked to determine whether the relay transmission is preferable to the direct transmission. Numerical examples are also presented to verify these results.

Original languageEnglish (US)
Article number5753992
Pages (from-to)1525-1529
Number of pages5
JournalIEEE Transactions on Communications
Issue number6
StatePublished - Jun 2011
Externally publishedYes

Bibliographical note

Funding Information:
Paper approved by W. Yu, the Editor for Cooperative Communications and Relaying of the IEEE Communications Society. Manuscript received May 28, 2010; revised October 4, 2010. The authors are with the Department of Electrical and Computer Engineering, Colorado State University, 1373 Campus Delivery, Fort Collins, CO 80523-1373 USA (e-mail:,, A portion of the results in this paper was presented at the Military Communications Conference (MILCOM), Oct. 2009. This work is in part supported by the Office of Naval Research under grant #N0014-07-1-0868 and NSFC-61001067. Digital Object Identifier 10.1109/TCOMM.2011.041111.100128


  • Relay selection
  • energy efficiency
  • wireless sensor networks


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