QoS supported MAC mechanism is a key issue for supporting QoS in wireless ad hoc networks. A new backoff algorithm,named RWBO+BEB,was proposed previously to decrease the packet collision probability significantly. In this paper,it is explored how to make RWBO+BEB support service differentiation in wireless ad hoc networks,and a novel proportional service differentiation algorithm,named p-RWBO,is proposed to allocate the wireless bandwidth according to the bandwidth ratio of each station. In p-RWBO,station n's walking probability(pw,n) is selected according to its allocated bandwidth ratio. An analytical model is proposed to analyze how to choose pw,n according to the bandwidth ratios of station n. The simulation results indicate that p-RWBO can differentiate services in terms of both bandwidth and delay.
LONG KePingLI YunZHAO WeiLiangWANG ChongGangKazem SOHRABY
