In recent years, Wireless sensor network has been developed as a new information acquisition technology. It has been widely used in many fields such as environmental monitoring, industrial control and so on. In addition, it has many characteristics such as multi hop transmission, multi transmission, limited resources and so on. Not only easily lead to network congestion, but also makes the traditional congestion control mechanism has been unable to effectively solve its congestion control problem. Therefore, the research of congestion control mechanism about wireless sensor network has important practical significance and application value. In this paper, we study the congestion control strategy based on the characteristics of wireless sensor network, and propose a congestion avoidance mechanism based on cognitive wireless sensor network. On this basis, according to the OSI model (OSI) defined by SimpliciTI protocol, the physical layer, MAC layer and the network layer is realized, the cognitive users communication process is described from the perspective.
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