Based On The Road Pipeline On-demand Location Vehicle Research Of Routing Protocol

Vehicle Ad Hoc Network is one special form of Mobile Ad Hoc Network. It has some characteristics of wireless network:for example, node mobility causes frequent changes of network topology, limited wireless bandwidth, node in the network of peer and so on. But,VANET have some different from MANET. For example,node movement has a certain directional, node has adequate energy,node has powerful computing capabilities,node in the internal space is large,can be loaded GPS navigation systems、electronic maps and so on. According to these characteristics can help the node to establish an efficient routing path.Based on the characteristics of VANET, improved AODV protocol,demand Based on the road pipeline on-demand location vehicle research of routing protocol,urban roads as lines of communication was first proposed in the agreement, vehicles in the city as a packet in the communication line. The different between this agreement and other location-based routing protocol is that the choice of routing path is not dependent on the node,but to choose the best road to reach the destination node as data packet delivery routing path. Each intersection,set a fixed node,used to make the intersection at the choice of the packet direction and identifies the routing path. Made communication and established a communication path with destination node,the routing protocol needs to be done, there are three points:One, one source node in real time prediction algorithm estimates the location of the destination node to select the routing path of packet delivery.Two, packet delivery process, we must first select a fixed node as its next hop node or if it is not in the fixed node communication range, select the same direction in front of the node as its next hop node in the same direction or select the reverse directionin in front of the node as its next hop node.Three, when the speed of the destination node or source node has changed so much, to timely inform the source node or destination node.Routing path establishment, maintenance, and the three points mentioned above said, this paper proposes six messages in the BPRP routing protocol:RREQ、RREP、RRDV、 RRSV、MBEQ、MBEP. In the fourth chapter,simulate BPRP routing protocols. First of all, in the software of Vanetmobisim to achieve the vehicle node running scene-urban scenes, vehicle networking movement model, resulting in close to real-world vehicle node movement scenarios, as the NS-2platform files generated by Vanetmobisim. Then, in the NS-2platform, its simulation, and from three aspects:the average end-to-end delay, the average routing hops, packet delivery ratio of AODV, GPSR protocol. This algorithm is better than the above two protocols on the data forwarding success rate and data propagation delay. In particular, packet delivery ratio, because each packet in the head by adding to the transmission path, to ensure its success arrive.