Improving Wireless Ad Hoc Networks Lifetime through Energy Exhaustion Recovering

In wireless networks environment, nodes are powered by exhaustible energy provided by batteries with limited duration. When the energy budget of a node comes to exhaustion, many undesirable situations may occur, ranking from minor alternative route discovery to unbearable network partition. Another situation which has not yet paid attention is one reached when a distributed application requires more running time than that will be provided by nodes capability. Up to now, lots of research has been devoted to this problem but all proposals addressed this issue attempt to alleviate this inconvenience through energy consuming optimization way. However, the problem remains as a hole when running long lived ubiquitous distributed applications. So, the expected results could not be provided if provisions to overcome battery depletion are not ensured. In this paper, we propose several strategies which may overcome node energy lack and may be used in any battery–based system. So, when a battery of a node suffers from depletion, either a new battery has to replace the former one, enabling the running processes to terminate execution, or uncompleted processes have to migrate to another node with large energy budget. The strategies have been compared according some convenient metrics.