A Reprogamming Protocol Based on State Machine for Wireless Sensor Network

In order to solve the problem that program-code of the sensor node in wireless sensor network was difficult to upgrade, the application layer protocol OTA-WSN was presented. With reference to the OTA Technology applied in mobile network, this paper defined the functions of each communication sector in the protocol, including package´s format of the application layer packages and data transfer protocol it used. It also putted forward the framework of the protocol and the theoretical model of state-machine. This protocol had been realized on a wireless sensor network platform called Mica2. The experiment result shows that this protocol not only improves feasibility and reliability of the wireless sensor network but also incarnates the efficiency for development of the WSN system.