ISSN : 2349-3917
Mobile ad hoc network (MANET) are infrastructure-less, self-organizing, rapidly deployable wireless network, they are highly suitable for applications involving special outdoor events, communications in regions with no wireless infrastructure, emergencies and natural disasters, and military operations. Routing is one of the key issues in MANETs due to their highly dynamic and distributed nature. In particular, energy efficient routing is the most important design criteria for MANETs since mobile nodes will be powered by batteries with limited capacity. Power failure of a mobile node not only affect the node itself but also its ability to forward packets on behalf of others and thus the overall network lifetime. The paper focuses on the review of work done in energy efficiency routing in MANET.