关键词: MAC协议, 低能耗, 低延迟, 占空比, 无线传感器网络

Abstract: This paper proposes a new MAC protocol，ATMAC which can be adaptive to the traffic load.Based on the TMAC protocol，aimed to low energy consumption，low latency，several scheme is used to make nodes sleep more when their traffic is lower，while be awake more when their traffic is high，such as adaptive duty-cycle，adaptive contention window，and privileged data transfer queue.Moreover，the duty-cycle of nodes refer to in low and high traffic can be different even they are in one virtual cluster.So the energy consumption of idle listening and latency can be reduced while increasing the throughput.The simulation results with ns-2 show that ATMAC outperform TMAC in energy consumption and latency.

Key words: MAC, low energy consumption, low latency, duty-cycle, wireless sensor networks