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In this paper, a novel model is proposed to analyze the throughput of multi-hop CSMA/CA network. Under certain assumptions, a product-form expression is derived for the stationary distribution of the underlying discrete-time Markov chain, and the throughput formula is given for each link. Interestingly, it is shown that the model includes slotted ALOHA, wireless LAN [Bianchi] and idealized CSMA [csma-87] as special cases. Therefore, it not only provides a unified view of the different models but also covers many new cases. Based on the model, we design fully distributed algorithms to improve the throughput and fairness of CSMA/CA networks. In particular, a transmission-length control algorithm is shown to be throughput-optimal (even with collisions), although it has higher overhead than a transmission-probability control algorithm. And a cross-layer algorithm is given to achieve fair bandwidth sharing among different flows. Our analytical results are corroborated by comprehensive simulations.

Details

Title
A Novel Approach to Model and Control the Throughput of CSMA/CA Wireless Networks
Creator
Walrand, Jean, Author
Jiang, Libin, Author
EECS Department, University of California, Publisher
Published
EECS Department, University of California, University of California at Berkeley, Berkeley, California, January 18, 2009
Full Collection Name
Electrical Engineering & Computer Sciences Technical Reports
Other Identifiers
EECS-2009-8
Type
Text
Format
technical reports
Extent
15 p
Archive
The Engineering Library
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