Recent advances in PHY layer design demonstrated efficient

self-interference cancellation and full-duplex in a single band.

Building a MAC that exploits self-interference cancellation is a

challenging task. Links can be scheduled concurrently, but only if

they either (i) don't interfere or (ii) allow for self-interference

cancellation. Two issues arise: Firstly, it is difficult to construct

a schedule that fully exploits the potentials for self-interference

cancellation for arbitrary traffic patterns. Secondly, designing an

efficient and fair distributed MAC is a daunting task; the issues

become even more pronounced when scheduling under the constraints. We

propose ContraFlow, a novel MAC that exploits the benefits of

self-interference cancellation and increases spatial reuse. We use

full-duplex to eliminate hidden terminals, and we rectify

decentralized coordination inefficiencies among nodes, thereby

improving fairness. Using measurements and simulations we illustrate

the performance gains achieved when ContraFlow is used and we obtain

both a throughput increase over current systems, as well as a

significant improvement in fairness.

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In  WiOpt 2011

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