A wired router can eliminate 802.11 unfairness, but it's hard

Authors:
Kan Cai;Junfang Wang;Reza Lotun;Michael J. Feeley;Michael Blackstock;Charles Krasic
Affiliations:
University of British Columbia, Vancouver, B.C., Canada;University of Cincinnati, Cincinnati, Ohio;University of British Columbia, Vancouver, B.C., Canada;University of British Columbia, Vancouver, B.C., Canada;University of British Columbia, Vancouver, B.C., Canada;University of British Columbia, Vancouver, B.C., Canada
Venue:
Proceedings of the 9th workshop on Mobile computing systems and applications
Year:
2008

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Abstract

As mobile computing becomes ubiquitous and airspace more congested, it is increasingly important to fairly distribute bandwidth between competing wireless devices in order to ensure predictable and satisfactory performance for end users. In prior work, we have proposed a cross-layer approach called Shaper [3, 4] that uses TCP and a central router rather than the 802.11 protocol to decide the outcome of bandwidth allocation. The key idea is to avoid airspace congestion from happening in the first place. Shaper is effective and also easy to deploy. However, its implementation faces many fundamentally difficult challenges. This paper details these challenges and possible solutions.