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    Mitigating Collisions through Power-Hopping to Improve 802.11 Performance

    Patras, Paul and Qi, Hanghang and Malone, David (2014) Mitigating Collisions through Power-Hopping to Improve 802.11 Performance. Pervasive and Mobile Computing, 11. pp. 41-55. ISSN 1574-1192

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    In this article, we introduce a power-hopping technique (PH-MAC) that, by alternating between different transmission power levels, aims to deliberately cause packet capture and thereby reduce the impact of collisions in 802.11 WLANs. We first devise an analytical model of the 802.11 protocol with heterogeneous capture probabilities, and show that, depending on the network load, the capture effect can enhance the throughput performance of all nodes. We base the design of PH-MAC on the findings following from this analysis and demonstrate that important performance improvements can be achieved by exploiting the interactions between the MAC and PHY layers to mitigate collisions. Finally, to understand the feasibility of this technique in practical deployments, we present a prototype implementation of PH-MAC which relies on commodity hardware and open-source drivers. We evaluate the performance of this implementation in an indoor testbed under different network conditions in terms of link qualities, network loads and traffic types. The experimental results obtained show that our scheme can provide significant gains over the default 802.11 mechanism in terms of throughput, fairness and delay.

    Item Type: Article
    Additional Information: The is the preprint version of the published article, which is available at doi:10.1016/j.pmcj.2013.03.005 . The research leading to these results has received funding from the European Community’s 7th Framework Programme (FP7-ICT-2009-5) under grant no. 257263 (FLAVIA project), the Irish HEA PRTLI Cycle 4 FutureComm and Science Foundation Ireland grant no. 07/SK/I1216a.
    Keywords: 802.11; power-hopping; capture effect;
    Academic Unit: Faculty of Science and Engineering > Research Institutes > Hamilton Institute
    Item ID: 6004
    Identification Number:
    Depositing User: Dr. David Malone
    Date Deposited: 08 Apr 2015 15:49
    Journal or Publication Title: Pervasive and Mobile Computing
    Publisher: Elsevier
    Refereed: Yes
    Funders: European Union Seventh Framework Programme, Higher Education Authority (HEA)
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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