DocumentCode :
2572872
Title :
Achieving Fairness in Wireless LANs by Enhanced IEEE 802.11 DCF
Author :
Nandiraju, Nagesh S P ; Gossain, Hrishikesh ; Cavalcanti, Dave ; Chowdhury, Kaushik R. ; Agrawal, Dharma P.
Author_Institution :
Center for Distributed & Mobile Comput., Cincinnati Univ., OH
fYear :
2006
fDate :
19-21 June 2006
Firstpage :
132
Lastpage :
139
Abstract :
Over the past few years, wireless local area networks (WLANs) have gained an increased attention and a large number of WLANs are being deployed in universities, companies, airports etc. Majority of the IEEE 802.11 based WLANs employ distributed coordination function (DCF) in wireless access points (AP) to arbitrate the wireless channel among Wireless Stations (STAs). However, DCF poses serious unfairness problem between uplink and downlink flows. To overcome this unfairness problem, we propose a simple enhancement to the IEEE 802.11 DCF which provides priority to the AP and thus enables it to acquire a larger share of the channel when required. We have demonstrated the unfairness problem through systematic measurements in an experimental test bed of WLAN using the legacy 802.11 DCF. We also developed analytical models to calculate the throughput of AP and the STAs and verify these results through thorough simulations in ns-2. We observe that our simulation results find in good agreement with our analytical models. Results show that our proposed enhancement achieves a fair distribution of bandwidth and improves the throughput (by nearly 300%) for the downlink flows as compared to the DCF, without severely affecting the performance of uplink flows
Keywords :
wireless LAN; wireless channels; WLAN; distributed coordination function; enhanced IEEE 802.11 DCF; wireless channel; wireless local area network; Airports; Analytical models; Bandwidth; Computer networks; Downlink; Local area networks; Mobile computing; Scheduling algorithm; Throughput; Wireless LAN;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Wireless and Mobile Computing, Networking and Communications, 2006. (WiMob'2006). IEEE International Conference on
Conference_Location :
Montreal, Que.
Print_ISBN :
1-4244-0494-0
Type :
conf
DOI :
10.1109/WIMOB.2006.1696396
Filename :
1696396
Link To Document :
بازگشت