Research Of Local Repair In Ad Hoc Networks Routing Protocol

With the rapid developing of the Internet and other technology, the use of portable computer and handheld computer and other wireless terminals become increasingly common. wireless communication technology has also been rapidly developed, but in some special occasions, such as flooding, major geological disaster, Battlefield, and other special occasions, need a communication technology that do not dependent on any pre-paved network facilities, Ad Hoc network emerge as time require.Ad Hoc network is a network generated by a group of independent wireless nodes or terminals with receive and transmit device collaborative work together; Ad Hoc network is a self-connection, self-organization, self-managing network . In the Ad Hoc network, node move at any time, each node acts as host and acting as routers for other nodes ay the same time, which led to the Ad Hoc network topology changes frequently and unpredictable, and the traditional vector or link state routing protocol is not suitable for the topology changing rapidly Ad Hoc network, the now existing Ad Hoc network routing protocol all has its limitations, and many places still need to be improved.Ad Hoc network routing protocol can be divided into table-driven routing protocol and on-demand routing protocol, and the on-demand distance vector routing protocol AODV as a on-demand routing protocols Ad Hoc network has superior performance than many Ad Hoc network routing protocol, so research on AODV routing protocol is a hot spots for Ad Hoc network routing prtocol.For the existing problem of recurrence local repair happen in the Node move vigorous region and the local repair without consider the downstream link in AODV routing protocol, the paper proposed a new routing protocol with decision-making mechanism and double-way repair AODV-DD(AODV with decision-making and double-way repair),The new protocol improved the local repair in AODV, adding the local repair number of Node to decide whether local repair happen and optimize the algorithm by double-way repair in local repair. The NS2(network simulation version 2) simulation results show that the routing protocol performance improved a certain extent after the local repair improved, especially have a great improvement in delay.