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Revisiting relay assignment in cooperative communications

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Abstract

The performance gain of cooperative communications heavily depends on the selection of relay. Most of the existing relay selection methods for cooperative communications aim at maximizing cooperative gain by selecting appropriate relay, without taking into account the adverse effect brought by cooperative communications: extra interference introduced by relay transmission (called cooperation interference). Thus the derived performance gain could be inaccurate and/or the selected relay may be not optimal. In this paper, we address the assignment of relays for multiple communication sessions using cooperative communication mode in wireless networks. We first thoroughly investigate the adverse effect brought by using relays, and derive the cooperation gain with consideration of cooperation interference. Based on the insights of our investigation, we propose a method of assigning relays to individual transmission flows while taking into account cooperation interference. In order to tradeoff the advantage and adverse effect caused by relay transmissions, we use an auction approach to address relay assignment of cooperative communications. Specifically, we propose a single round double auction scheme (SAS) for centralized wireless network and a multiple rounds sequential auction scheme (MAS) for decentralized wireless network for relay assignment. We conduct extensive simulation experiments to validate the effectiveness of SAS and MAS. The significance of cooperation interference, the improvement of overall system throughput and energy efficiency of our proposed relay assignment schemes are demonstrated by numerical results.

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Notes

  1. This work was partially supported by Program for Changjiang Scholars and Innovative Research Team in University (IRT1299), the special fund of Chongqing key laboratory (CSTC), the Science and Technology Research Project of Chongqing Municipal Education Commission of China (KJ1500406), Advanced and Applied Basic Research Projects of Chongqing (cstc2015jcyj40048), and the Open Research Fund of National Mobile Communications Research Laboratory, Southeast University (No. 2015D07). Some results contained in this paper have been previously presented at GLOBECOM 2014 [1].

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Acknowledgments

This work was supported by Program for Changjiang Scholars and Innovative Research Team in University (IRT1299) and the special fund of Chongqing key laboratory (CSTC).

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Authors and Affiliations

  1. Key Lab of Mobile Communication Technology, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China

    Bin Cao, Quan Chen & Yun Li

  2. National Mobile Communications Research Laboratory, Southeast University, Nanjing, 210096, China

    Yun Li

  3. National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu, 611731, China

    Gang Feng

  4. InterDigital Communications, King of Prussia, PA, 19406, USA

    Chonggang Wang

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  1. Bin Cao
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  2. Quan Chen
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Correspondence to Chonggang Wang.

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Cao, B., Chen, Q., Feng, G. et al. Revisiting relay assignment in cooperative communications. Wireless Netw 23, 609–623 (2017). https://doi.org/10.1007/s11276-015-1177-8

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  • DOI: https://doi.org/10.1007/s11276-015-1177-8

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