Proper

Abstract

In this paper, Data Collection with Sink mobility is considered along the predefined path, which improve the energy efficiency of wireless sensor network and reduces the energy hole problem. Mobile travels along the single path and collect data from single hop. Due to limitation of fast depletion of battery, sensors are powered by renewable energy resources (solar, wind, vibration). The time-varying characteristics of harvesting energy put on great challenges in designing routing protocol for maximizing data collection. Due to time-varying characteristics multi–rate transmission and slot scheduling of transmission time problems occurs among the sensors and shows the NP-hardness of the problem. So an offline and online algorithm is devised with the assumption of having all global knowledge and without having global knowledge of each sensor. In addition a special case is also considered where each sensor node has its fixed transmission power.