Abstract
Energy constraint wireless sensor networks area is the most promising research domain today. A dynamic power management technique at operational level can effectively oversee the power consumption and prolong the lifespan of a sensor node. Several stochastic models have been introduced and presented to analyze the system. To improve upon the given models, a semi Markov model with analyser has been proposed. Further, this paper gives the detailed stochastic modelling and analysis of lifetime improvement and power consumption of analyser based sensor node. To observe the effect of analyser on overall power consumption of sensor node, the power consumption of analyser block is also analyzed.