Upper bounds on the network lifetime and optimum location of base stations are derived when multiple base stations are deployed for a given sensor network. Network lifetime bound and jointly optimum base station locations are obtained for one and two base stations using genetic algorithm. Further an alternate approach “individually optimal solution” is proposed for more base station cases where the problem becomes prohibitively complex. Simulation results validatingthe network lifetime bounds and the optimal choice of the locations of the base stations are also provided.   

In addition less complex algorithms are proposed for dynamically obtaining optimal base station(s) locations when multiple mobile base stations are deployed to increase network lifetime and amount of total data delivered.
Investigation for additional lifetime gain that can be achieved when an energy aware routing protocol is employed in the multiple base stations scenario is also done.

Benefit of employing cooperative diversity is illustrated briefly through theoretical bounds and simulation considering a single base station scenario and using an amplify-and-forward relay protocol in wireless sensor network.

Thesis   [pdf]