NDLI: Impact of capture and varying transmit power levels on saturation throughput in IEEE 802.11

Content Provider	IEEE Xplore Digital Library
Author	Vukovic, I.N. Smavatkul, N.
Copyright Year	2005
Description	Author affiliation: Motorola Inc., IL (Vukovic, I.N.)
Abstract	Multiple backlogged stations communicating with a central receiving node or access point using IEEE 802.11 MAC is analyzed. When packets are sent simultaneously often one of the packets can be successfully received by the access point due to power capture effect. Several schemes for assigning transmit power level to each station are investigated along with two capture models. We apply a well know saturation throughput methodology developed by Bianchi (2000) which was recently simplified allowing schemes other than binary exponential backoff to be analyzed. With stations in different radio conditions the user population is not homogeneous and the collision probability is not fixed. Two schemes are investigated in which each station is either assigned a fixed power level from a set of & levels or randomly chooses a power level for each transmission from the same set. We show that power capture improves performance of 802.11 in the basic mode for each scheme. We also calculate individual user throughput and show that significant fairness imbalance arises with fixed power assignments. We also provide an upper bound for the throughput assuming perfect knowledge of the number of colliding stations
Starting Page	1435
Ending Page	1440
File Size	2265120
Page Count	6
File Format	PDF
ISBN	9783800729098
DOI	10.1109/PIMRC.2005.1651682
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-09-11
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Throughput Power system modeling Upper bound Multiaccess communication Counting circuits Fading Power control Access protocols Media Access Protocol Radio transmitters
Content Type	Text
Resource Type	Article

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