Methods for restoring MAC layer fairness in IEEE 802.11 networks with physical layer capture

Authors:
Sachin Ganu;Kishore Ramachandran;Marco Gruteser;Ivan Seskar;Jing Deng
Affiliations:
Rutgers, The State University of New Jersey, New Brunswick, NJ;Rutgers, The State University of New Jersey, New Brunswick, NJ;Rutgers, The State University of New Jersey, New Brunswick, NJ;Rutgers, The State University of New Jersey, New Brunswick, NJ;Rutgers, The State University of New Jersey, New Brunswick, NJ
Venue:
REALMAN '06 Proceedings of the 2nd international workshop on Multi-hop ad hoc networks: from theory to reality
Year:
2006

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Abstract

In this paper, we experimentally investigate the physical layer capture effect in off-the-shelf 802.11 network cards and confirm that it reduces throughput fairness of traffic flows. We then study the feasibility of using the following PHY and MAC layer approaches to mitigate the disproportionate allocation of throughput in capture dominated scenarios: transmit power control, retransmission lim-its, CWmin adjustment, TxOp adjustment, and AIFS control. The results obtained on the ORBIT indoor wireless testbed 1 show that the 802.11e EDCF parameters provide the most fine-grained con-trol of fairness.