Analyze on existing problems of the binary back-off mechanism

and propose an improved back-off algorithm. By introducing the concept of the transmission-filtered threshold

the algorithm dynamically adjusts waiting time of wireless nodes

in order to achieve the maximum network throughput. In the IEEE 802. 11 DCF protocol

the simulation experiments are carried out with the same physical layer parameters. Experimental results show that normalized network throughput and average packet access delay of improved algorithm can all be improved with varying degrees under two access modes and especially basic access mode

by contrast with BEB algorithm

SD-DCF algorithm and MMS algorithm.