A new backoff algorithm to support service differentiation in ad hoc networks

Authors:
Li Yun;Ke-Ping Long;Wei-Liang Zhao;Chonggang Wang;Kazem Sohraby
Affiliations:
Special Research Centre for Optical Internet & Wireless Information Networks, ChongQing University of Posts & Telecommunications, ChongQing, China;Special Research Centre for Optical Internet & Wireless Information Networks, ChongQing University of Posts & Telecommunications, ChongQing, China;Special Research Centre for Optical Internet & Wireless Information Networks, ChongQing University of Posts & Telecommunications, ChongQing, China;Department of Electrical Engineering, University of Arkansas, Fayetteville, AR;Department of Electrical Engineering, University of Arkansas, Fayetteville, AR
Venue:
MSN'05 Proceedings of the First international conference on Mobile Ad-hoc and Sensor Networks
Year:
2005

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Abstract

It is essential to design QoS supported MAC mechanism for supporting QoS in WLAN. In [1], we have proposed a new backkoff algorithm, named RWBO+BEB, to decrease the packet collision probability significantly. In this paper, we explore how to make RWBO+BEB support service differentiation in WLAN, and propose a novel proportional service differentiation algorithm, named p-RWBO, to allocate the wireless bandwidth according to the bandwidth ratio of each station. The basic idea of p-RWBO is that different priority stations use different walking probability, pw, which is a key parameter in RWBO+BEB. An analytical model is proposed to analyze how to choose pw according to the bandwidth ratios of stations. The simulation results indicate that p-RWBO can allocate the wireless bandwidth according to the bandwidth ratio of each station.