An Adaptive RTS Threshold Adjusting Algorithm Based on Minimum Energy Consumption in IEEE802.11 DCF

In IEEE 802.11 WLAN, the average energy consumption in transmission per frame through DCF mechanism is analyzed by mathematical model. Further analysis shows there is an optimum RTS threshold that can minimize the average energy consumption per frame. An algorithm of RTS threshold adjustment is developed based on the relationship of average retransmission times and optimum RTS threshold. With this algorithm a station can adaptively adjust its RTS threshold according to network environment in order to reduce energy consumption in transmission. All theoretical analysis and algorithm are validated by computer simulation.