Making 802.11 DCF Near-Optimal: Design, Implementation, and Evaluation

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This paper proposes a new protocol called Optimal DCF (O-DCF). O-DCF modifies the rule of adapting CSMA parameters, such as backoff time and transmission length, based on a function of the demand-supply differential of link capacity captured by the local queue length. O-DCF is fully compatible with 802.11 hardware, so that it can be easily implemented only with a simple device driver update. O-DCF is inspired by the recent analytical studies proven to be optimal under assumptions, which often generates a big gap between theory and practice. O-DCF effectively bridges such a gap, which is implemented in off-the-shelf 802.11 chipset. Through extensive simulations and real experiments with a 16-node wireless network testbed, we evaluate the performance of O-DCF and show that it achieves near-optimality in terms of throughput and fairness and outperforms other competitive ones, such as 802.11 DCF, optimal CSMA, and DiffQ for various scenarios. Also, we consider the coexistence of O-DCF and 802.11 DCF and show that O-DCF fairly shares the medium with 802.11 via its parameter control.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2016-06
Language
English
Article Type
Article
Keywords

PERFORMANCE; PROTOCOL; NETWORKS

Citation

IEEE-ACM TRANSACTIONS ON NETWORKING, v.24, no.3, pp.1745 - 1758

ISSN
1063-6692
DOI
10.1109/TNET.2015.2432053
URI
http://hdl.handle.net/10203/213277
Appears in Collection
EE-Journal Papers(저널논문)
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