Adaptive Quadrant-Based Geographic Routing For MANET
U B Babitha · 2014
Coping with mobility and dynamism is one of the biggest challenges in mobile ad hoc networks. In geographic routing, nodes need to maintain up-to-date positions of their immediate neighbors for making effective forwarding decisions. Periodic broadcasting of beacon packets that contain the geographic location coordinates of the nodes is a popular method used by most geographic routing protocols to maintain neighbor positions. We contend and demonstrate that periodic beaconing regardless of the node mobility and traffic patterns in the network is not attractive from both update cost and routing performance points of view. This paper propose an adaptive on-demand geographic routing scheme in which topology information is updated in a timely manner according to network dynamics and traffic demands to provide efficient and reliable routing. It uses a limited flooding routing protocol that restricts the broadcast region to all nodes in the same quadrant as the source and destination and does not require maintenance of a separate neighbor table at each node. As a result the number of broadcast messages decreases, reducing data flooding, providing improved channel efficiency and improves bandwidth utilization and lifetime of intermediate nodes which provides improved route stability. It proposes a route optimization scheme that adapts the routing path according to both topology changes and actual data traffic requirements.