DocumentCode :
1502035
Title :
A two-level medium access framework for exploiting multi-user diversity in multi-rate IEEE 802.11 wireless LANs
Author :
Chen, Da Rui ; Zhang, Ying Jun Angela
Author_Institution :
Dept. of Inf. Eng., Chinese Univ. of Hong Kong, Hong Kong, China
Volume :
8
Issue :
10
fYear :
2009
fDate :
10/1/2009 12:00:00 AM
Firstpage :
5144
Lastpage :
5154
Abstract :
Fast rate adaptation has long been recognized as an effective way to improve the PHY-layer data rate of wireless networks. However, in random access wireless networks such as IEEE 802.11 wireless LANs, MAC-layer throughput is dominated by stations with the lowest transmission rates, resulting in an underutilization of spectrum bandwidth. In this paper, we propose a novel two-level medium access framework, referred to as two-level MAC, to solve the aforementioned problem and to significantly improve system spectrum efficiency through the exploitation of multiuser diversity. The key idea of two-Level MAC is to introduce a second level of deterministic channel access on top of the traditional IEEE 802.11 DCF protocol. By doing so, higher priority is granted to high-rate stations in a fully distributed manner. Meanwhile, collisions among potential contending stations are drastically reduced. Through analysis, we show how such two-Level MAC can be optimized to achieve the maximum system throughput. The superiority of the proposed protocol is verified through analyses and extensive simulations.
Keywords :
access protocols; bandwidth allocation; diversity reception; multiuser channels; wireless LAN; wireless channels; DCF protocol; MAC-layer throughput; deterministic channel access; multirate IEEE 802.11 wireless LAN; multiuser diversity; random access wireless network; spectrum bandwidth; two-level medium access framework; Access protocols; Analytical models; Bandwidth; Degradation; Media Access Protocol; Physical layer; Throughput; Time-varying channels; Wireless LAN; Wireless networks; IEEE 802.11 WLANs, medium access control (MAC), multi-user diversity, performance anomaly, rate adaptation;
fLanguage :
English
Journal_Title :
Wireless Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-1276
Type :
jour
DOI :
10.1109/TWC.2009.081167
Filename :
5288950
Link To Document :
بازگشت