Lifetime enhancement has always been of crucial importance for wireless sensor network due to resource limitations of sensor nodes. In the recent past some researchers have suggested moving base station method to enhance the lifetime of wireless sensor network. However the movement of base station in sensor field is a complex problem and practically may not be feasible. In this paper, we propose a unique movement strategy for base station to reduce energy consumption. The motion of base station is governed by fuzzy logic inference mechanism. The strategy used in this paper is unique in the sense that the base station is allowed to move only on a predefined path making it practically more feasible. Final results are compared with the method having stationary base station and method in which motion of base station is governed by fuzzy logic inference mechanism but without following any predefined path. Simulation results show that our strategy enhances lifetime by a significant amount as compared to stationary base station. We further propose that by increasing or decreasing area covered by predefined path we can get desired lifetime intermediate between the above two approaches.