A Survey on Energy efficient protocols in Mobile Adhoc Networks

Mobile adhoc network is an independent group of mobile nodes in which communicate over relatively bandwidth restricted wireless links. The nodes in mobile adhoc network are mobile so that the topology of the network may change quickly and unpredictably over time. In a mobile adhoc network it is very difficult to achieve significant improvement in the energy efficiency and enhance lifetime of the network. Because lacking of power in any wireless device become useless. In the physical layer, if a node is not involve in transmission, the transceiver keep on in an idle mode and to listen if there is any incoming transmissions. Because nodes consume less amount of energy for listening is lesser than for data communication. Suppose, if there is infrequent transmissions destined to the station, idle listening takes wastage of energy. Therefore, in order to reduce the energy without impacts in network connectivity, different types of wakeup schemes are used like operation of power saving protocols and different asynchronous Quorum based power conservation protocols. The power saving protocols allows mobile nodes to switch to a low power sleep mode. In the asynchronous wakeup protocols, uses instead of idle listening it permits station to sleep to suspend the transceiver when there is no transmission of data. Particularly, in the following survey to analyze the different wakeup methods how to improve the network lifetime. Key terms: Mobile adhoc network, energy consumption, Lifetime of network, wakeup schemes