| Mobile Ad hoc Network(MANET) is a multi-hop temporary autonomous system which is composed of mobile nodes with wireless transmitters and receivers. Because of having many advantages, such as the networks being builded rapidly and flexibly, and being not limited by wiring, MANET can extensively be used to emergency search, disaster rescue, military applications, and so on. It has widespread application,and it is also an important direction of networks now.The existing routing protocols for Ad hoc network are mostly based on nerwork topology. However, in MANET which topology changes randomly and constontly,these routing protocols have not good perfomence. The geography-based routing protocol is a new routing design strategy for MANET,which use the geographical location information of mobile nodes to choose route.The geography-based routing changed the blindness and heavy overheads of flood routing algorithm,but geography-based routing may select the long detour paths when greedy forwarding fails. For this reason, we propose a new geography-based routing called GPSR-AD (GPSR based on Angel and Distance) . When greedy forwarding fails at point C,it will find a node from its neighbor nodes which is closer to destination node D and this node is more closer to the the direction of destination node. Using this method,although there is no node which is closer to the node D ,but it will transfer the packets to the node which is relative closer to the node D on the direction of CD . This reduces multi-hop traversal by Planer Perimeter.Finally , evaluation on GPSR-AD and GPSR is done by NS . Performance results reveal that GPSR-AD performs better than the GPSR in term of average delivery success rate and packet lost rate. Whatmore, it reduces a large portion of hops introduced by perimeter mode of GPSR. |
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