Scheduling based on time-sensitivity for wireless sensor network

A key factor affecting the lifetime of wireless sensor networks(WSN) is its limited energy. Firstly, ratio of energy cost of different parts of a sensor node and time-dependent difference of data gathered is presented. Then, in order to prolong the lifetime of WSN under the limited energy, time-sensitivity of sensor is defined, sensors are classified based on it, scheduling for data gathering with time-sensitivity is presented and the ratio of energy saving is analyzed theoretically. Finally, the scheduling for data gathering based on time-sensitivity is implemented on Micaz platform, experimental data is gathered by simulation and measurement. The result illuminates that the scheduling based on time-sensitivity can reduce energy consumption by reducing data quantity transmitted, and it is more observable as the time-sensitivity become lower.