DocumentCode :
2371638
Title :
Distributed contention control in heterogeneous 802.11b WLANs
Author :
Bruno, Raffaele ; Conti, Marco ; Gregori, Enrico
Author_Institution :
Italian Nat. Res. Council, IIT Inst., Pisa, Italy
fYear :
2005
fDate :
19-21 Jan. 2005
Firstpage :
190
Lastpage :
199
Abstract :
Several feedback-based mechanisms have been proposed to maximize the IEEE 802.11 MAC protocol efficiency by guaranteeing an optimal time-spreading of users´ channel accesses. However, these solutions suffer from a significant unfairness problem in the presence of stations adopting the standard binary exponential backoff algorithm. Generally, a few legacy stations are sufficient to completely starve enhanced stations employing a modified 802.11 MAC protocol that adapts the backoff to the network contention level. In this paper we propose a credit-based scheme to enforce fairness in heterogeneous networks. Specifically, enhanced stations earn credits when releasing transmission opportunities granted by the standard protocol. The credits are a virtual currency spent by the enhanced stations to reclaim new transmission opportunities. In this paper, we apply our solution to the distributed mechanism for contention control named AOB L. Bononi et al. (2004). Simulation results show the effectiveness of the proposed mechanism in all the network scenarios considered.
Keywords :
IEEE standards; carrier sense multiple access; distributed control; feedback; telecommunication channels; telecommunication congestion control; telecommunication standards; telecommunication traffic; wireless LAN; AOB; IEEE 802.11 MAC protocol; WLAN; asymptotically optimal backoff; binary exponential algorithm; credit-based scheme; distributed mechanism; fairness enforcement; feedback-based mechanism; heterogeneous network; medium access control; network contention control; optimal time-spread; standard protocol; user channel; virtual currency; wireless local area network; Access protocols; Collision avoidance; Councils; Distributed control; Educational programs; Media Access Protocol; Project management; Receiving antennas; Technology management; Wireless LAN;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Wireless On-demand Network Systems and Services, 2005. WONS 2005. Second Annual Conference on
Print_ISBN :
0-7695-2290-0
Type :
conf
DOI :
10.1109/WONS.2005.12
Filename :
1383420
Link To Document :
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