Wireless sensor networks have been the targets of active research in the recent past due to their military and civil applications. Differentiating from traditional networks, WSN are very resource constrained. In view of the main tasks for WSN are to collecting information from areas under surveillance, it is an important issue to save communication energy meanwhile ensure the sampled data reliable. Medium access control(MAC) protocols are the basis of communication for each node, therefore researching protocols are dramatically significant for relieving collisions and filtering redundant,so that to reduce communication energy. Data compression is also one of important method to reduce energy. This paper mainly opens out the research based on the MAC protocol of the asynchronous communication mode and the compression algorithm using wavelet base on this MAC protocol, with the follow production:Firstly, this paper proposes a concept of asynchronous communicaton mode, based on the feasibility of low-power asynchronous communicaton module. In allusion to the possible effects on each-layer protocol and global performance of wireless sensors networks from the asynchronous mode, it has designed an asynchronous MAC protocol using peridical awake-sleep, partial time-synchronization and interactive-confirmation ACK mechanism etc.
