Researches Ad Hoc Network Routing Protocols Base On The Position Estimate

Ad Hoc network is a complicated distribute system, which has dynamic topology. There is no infrastructure in Ad Hoc network,while every node can be router and host, then form a multi-hop distributed network.How to rapidly find a stable route is the key problemin Ad Hoc network.There is no excellent performance Ad Hoc routing now, especially for QoS routing, which still in the initial stage and there is no industry standard.So it need do further research in Ad Hoc routing.First some basic concept of Ad Hoc network was introduced, then analysed Ad Hoc routing protocols.We analyzed and compared the performance of several Ad Hoc routing protocols in different network environment via OMNeT++,such as mobility, network load and environment.The simulation shows along with network load,send out rate decline,the cost of routing increase and the delay of end to end extend.Network simulation shows these routing protocols have some weakless such as big cost and long delay.So an LAODV (Ad hoc On Demand Distance Vector routing Based On the position prediction) is proposed.We designed an adaptive localization algorithm for locating node.Set some beacon node that known there location,once there is no enough beacon node in the network, the senior node will be alternated node for beacon and join the localization stage.When get there location, via the prediction of the new position to confirm the position and direction of the node,then choose the best route to transmit. It will decrease the numbers of break route and re-route,and increase the data transmition rate.The simulation shows,through the prediction of position, using the directional flooding and resourse reserve to ensure the QoS,the cost of routing is decreased.