Energy-Efficient Uncoordinated Cooperative MAC with Uncertain Relay Distribution Intensity

Wei Song*, Peijian Ju, A. Long Jin

*Corresponding author for this work

Research output: Chapter in Book or Report/Conference proceedingChapterpeer-review


As a promising technique, cooperative communications make use of the broadcasting nature of wireless medium to facilitate data transmission, and thereby reduce energy consumption. However, in many studies on wireless cooperative diversity, it is often assumed that the number of relays or the relay distribution intensity is known a priori. In this chapter, we relax such assumption and propose an algorithm to estimate the relay intensity for a backoff-based cooperative scheme, where the relays are distributed as a homogeneous Poisson point process (PPP). It is proved that the algorithm can converge to an optimal solution with the minimum estimation error. Based on the estimated relay intensity, we further investigate a distributed energy saving strategy, which selectively turns off some relays to reduce energy consumption while maintaining the required transmission success probability. The performance of the proposed cooperative scheme is analytically evaluated with respect to the collision probability. The numerical and simulation results demonstrate the high accuracy and efficiency of the intensity estimation algorithm and also validate the theoretical analysis. Moreover, the proposed cooperative scheme exhibits significant energy saving and satisfactory transmission performance, which offers a good match to accommodate green communications in wireless networks.

Original languageEnglish
Title of host publicationWireless Networks(United Kingdom)
PublisherSpringer Science and Business Media B.V.
Number of pages26
Publication statusPublished - 2017
Externally publishedYes

Publication series

NameWireless Networks(United Kingdom)
ISSN (Print)2366-1186
ISSN (Electronic)2366-1445


  • Collision Probability
  • Energy Saving Strategy
  • Homogeneous PPP
  • Potential Relay
  • Successful Transmission Probability


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