Data queue length-based channel access method for wireless sensor network

The invention discloses a data queue length-based channel access method for a wireless sensor network. The method comprises the following steps that: a node periodically performs awakening and sleep scheduling to reduce energy consumption, measures own data queue length in real time after the awakening of each time, judges a current congestion degree, and stagewise regulates the size of a competition window according to different levels of the queue length to improve the priority of a competition channel of a congested node and relieve congestion; if the data queue length is less than 1/3 of queue capacity, the node adopts a slow competition window regulation mechanism to slowly reduce the size of the competition window of the node along with the increase of the queue length to avoid early congestion; and when the data queue length is more than 1/3 of the queue capacity, the node adopts a radical competition window regulation mechanism to quickly reduce the size of the competition window of the node along with the increase of the queue length to eliminate the congestion as soon as possible. By the method, data packets can be uniformly distributed on nodes in the network in a network transmission process, so that the congestion is effectively relieved and eliminated, and the problem of network deterioration caused by the congestion is solved.