Improved sensor network lifetime using multiple mobile sinks: A new predetermined trajectory

A critical issue for data gathering in wireless sensor networks is the formation of energy holes near the sinks. Sensors near the sinks have to participate in relaying data on behalf of other sensors and thus will deplete their energy very quickly, resulting in network partitioning and limitation of the network lifetime. The solution that we propose in this paper is to use mobile sinks that changes its location following our proposed trajectory. In our trajectory we have seen to that the sink movement almost tries to involve the maximum number of sensors to act as bottleneck nodes. In this way the sensors located near sinks change over time thereby reducing the risk of energy hole formation.