Fairness in Collision-Free WLANs

TitleFairness in Collision-Free WLANs
Publication TypeConference Paper
Year of Publication2013
AuthorsL. Sanabria-Russo, J. Barceló, and B. Bellalta
Conference NameINFOCOM
Date Published03/2013
Conference LocationTurin, Italy
KeywordsCollision-free, CSMA/ECA, wifi, WLAN
Full TextCSMA/ECA is a contention protocol that makes it possible to construct a collision-free schedule by using a deterministic backoff after successful transmissions. In this paper, we further enhance the CSMA/ECA protocol with two properties that allows to fairly accommodate a large number of contenders in a collision-free schedule. The first property, called hysteresis, instructs the contenders not to reset their contention window after successful transmissions. Thanks to hysteresis, the protocol sustains a high throughput regardless of the number of contenders. The second property, called fair-share, preserves fairness when different nodes use different contention windows. We present simulations results that evidence how these properties account for performance gains that go even further beyond CSMA/CA.