The wireless sensor network traffic load is periodic and suddenness. There is a serious problem of network latency and energy wastage in SMAC protocol due to the fixed duty cycle. To solve the problem,this paper established two models of network latency and energy consumption,and proposed the estimation of the network traffic load in two aspects,of which the one was length of the queue in the buffer,anther was ratio of growth rate of the queue and the channel bandwidth. It also designed an algorithm of dyna...