AN APU BASED UPDATION SCHEME WITH ADDED SECURITY MEASURES

Routing with the use of location information has become one of the most suitable routing strategies in wireless mobile ad hoc network mainly due to its scalability.  Position information of the nodes is primary requirement in geographic routing.  Nodes for forwarding are selected among neighbors based on their location. Each node in the network should be aware of its neighbor’s location in order to maintain the accuracy of local topology. Hence updation of location information through beacon is necessary. Existing mechanisms invokes periodic beacon update scheme which in turn consumes the network resources specifically when the network traffic is high it leads to packet loss and at times causes retransmission of data packet  .In this work, adaptive position update is proposed which dynamically adjusts the beacon updation frequency according to the varying network conditions. APU is based on two simple principles nodes which moves with greater speed and nodes closer to forwarding paths update their positions more frequently (and vice versa)

Energy distribution control in wireless sensor networks through range optimization

A major objective in wireless sensor networks is to find optimum routing strategies for energy efficient use of nodes. Routing decision and transmission power selection are intrinsically connected since the transmission power of a node is adjusted depending on the location of the next hop. In this paper, we propose a location-based routing framework to control the energy distribution in a network where transmission ranges, hence powers, of nodes are determined based on their locations. We show that the proposed framework is sufficiently general to investigate the minimum-energy and maximum-lifetime routing problems. It is shown that via the location based strategy the network lifetime can be improved by 70% and the total energy consumption can be decreased to three-fourths to one-third of the constant transmission range strategy depending on the propagation medium and the size of the network