CARLA: combining Cooperative Relaying and Link Adaptation for IEEE 802.11 wireless networks

Li Li, Zhong Fan, Dritan Kaleshi

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

2 Citations (Scopus)
352 Downloads (Pure)


In this paper, we present a novel design named CARLA which combines Cooperative Relaying and Link Adaptation for IEEE 802.11 wireless networks, in order to maximize spectral efficiency and hence improve the throughput of the network. Unlike previous studies assuming that accurate channel information is available for relaying and link adaptation,the novelty of our approach is to use the expected packet transmission time (ETT) and RTS/CTS exchange to estimate the quality and level of contention for the current channel. By taking into account the quality of the direct channel from source to destination and the relay channel between relay and destination, CARLA enables both source and relay terminals to adjust their transmission rates so that not only the reliability of the transmission but also the bandwidth efficiency can be improved, hence fully utilizing the diversity gain. CARLA is a simple, distributed and rate-per-link adaptation protocol requiring no modification on 802.11 PHY and MAC. Simulation results show that CARLA can achieve significant performance improvement in terms of end-to-end throughput and energy efficiency for different network conditions.
Original languageEnglish
Title of host publicationIEEE 75th Vehicular Technology Conference (VTC2012-Spring).
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Publication statusPublished - May 2012

Bibliographical note

This work was sponsored by Toshiba Research Europe Ltd.

Copyright © [insert Year] IEEE. Reprinted with permission, from L Li, Zhong Fan, D Kaleshi; 'CARLA: Combining Cooperative Relaying and Link Adaptation for IEEE 802.11 Wireless Networks'; IEEE 75th Vehicular Technology Conference (VTC2012-Spring). This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it.


  • cooperative relaying
  • link adaptation
  • IEEE 802.11
  • Medium Access Control (MAC)


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