Impact of power control on performance of IEEE 802.11 wireless networks
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AbstractOptimizing spectral reuse is a major issue in large-scale IEEE 802.11 wireless networks. Power control is an effective means for doing so. Much previous work simply assumes that each transmitter should use the minimum transmit power needed to reach its receiver, and that this would maximize the network capacity by increasing spectral reuse. It turns out that this is not necessarily the case, primarily because of hidden nodes. This paper shows that, in a network with power control, avoiding hidden nodes can achieve higher overall network capacity compared with the minimum-transmit-power approach. It is not always best to use the minimum transmit powers even from the network capacity viewpoint. Specifically, we propose and investigate two distributed adaptive power control algorithms that minimize mutual interferences among links while avoiding hidden nodes. Different power control schemes have different numbers of exposed nodes and hidden nodes, which in turn result in different network capacities and fairness. Although there is usually a fundamental trade-off between network capacity and fairness, we show that, interestingly, this is not always the case. In addition, our power control algorithms can operate at desirable network-capacity-fairness trade-off points and can boost the capacity of ordinary non-power-controlled 802.11 networks by two times while eliminating hidden nodes.
All Author(s) ListHo IWH, Liew SC
Journal nameIEEE Transactions on Mobile Computing
Year2007
Month11
Day1
Volume Number6
Issue Number11
PublisherIEEE COMPUTER SOC
Pages1245 - 1258
ISSN1536-1233
eISSN1558-0660
LanguagesEnglish-United Kingdom
Keywords802.11; ad hoc networks; CSMA/CA; exposed nodes; hidden nodes; network capacity; power control; scalability; wireless networks; WLAN
Web of Science Subject CategoriesComputer Science; Computer Science, Information Systems; COMPUTER SCIENCE, INFORMATION SYSTEMS; Telecommunications; TELECOMMUNICATIONS

Last updated on 2020-08-08 at 01:23