关键词: 竞争窗口调整策略, 退避算法, 连续碰撞次数, （竞争窗口）快速增加的温和分布式协调功能（FI-GDCF）

Abstract: The performance of a backoff algorithm is determined by its adjustment strategy of Contention Window（CW） to a great extent. Aiming at the deficiency of fixed methods for adjusting CW when node collisions occur, continuous collision times of nodes are regarded as the indication of measuring how severe channel contention is and introduced into the adjustment strategy of CW, and on the basis of GDCF an adaptive backoff algorithm with CW Fast Increasing（FI-GDCF） is proposed, where a node will adjust its CW according to the exponential law of its continuous collision times. Theoretical analysis and simulation results show that collision probability, normalized network throughput and average packet access delay of FI-GDCF algorithm can all obtain improvement with varying degrees under two access modes and especially basic access mode, by contrast with BEB and GDCF algorithms.

Key words: adjustment strategy of contention window, backoff algorithm, continuous collision times, （Contention Window）Fast Increasing Gentle Distributed Coordination Function（FI-GDCF）