The Research On Algorithm Of Delay Tolerant Data Delivery In Vehicular Ad Hoc Network

In recent years,due to the continuous progress of wireless communication technology and the rapid development of the automobile industry,in the field of automotive industry has been widely used wireless self-organizing network technology,including vehicle self-organizing network(VANET)application.VANET vehicle nodes can provide users with a variety of services and applications,such as vehicle nodes between the communication,road conditions and connected to the Internet and so on.Because the VANET network has the characteristics of fast moving speed of the vehicle nodes,large number of vehicle nodes and frequent network topology,the existing MANET network routing protocol can not adapt to the VANET network and can not meet the demand of VANET network for stable and efficient transmission of data.Therefore,it is of great theoretical and practical significance to study the routing protocol that adapts to VANET network environment and is suitable for urban traffic environment.In this paper,a vehicle to infrastructure communication(V2I)communication algorithm is proposed by studying the current routing algorithm of message transmission.Transmission Algorithm Based on Cluster Head Forwarding(TACH)In this paper,an improved AODV routing protocol(Mend-AODV,MAODV)routing protocol is proposed to improve the traditional AODV protocol for the characteristics of VANET network.The ant colony algorithm and backup routing mechanism are introduced to ensure that the data can be efficiently and efficiently On the transmission,when the main routing performance is poor or break,enable backup routing information,re-transmission of data,improve the routing performance;and in order to reduce the broadcast storm,proposed a propagation delay based on the broadcast routing algorithm(Broadcast Routing Algorithm Based on Transmission Delay,BRTD).In VANET,the TACH algorithm effectively collects and collates the messages of a large number of vehicle nodes through the cluster head forwarding algorithm,reduces the network load and saves the resources of the channel resources and nodes.Moreover,the reliable transmission mechanism of acknowledgment and retransmission is adopted in the process of message transmission of cluster head forwarding algorithm in VANET,which improves the data receiving and receiving rate of roadside facilities(RSU)for mobile vehicle nodes.Finally,on the platform of opportunity network simulation,the simulation experiment of VANET routing algorithm TACH is presented.The simulation results show that the TACH algorithm adopts the confirmation and retransmission mechanism to greatly improve the data receiving rate,and the algorithm adopts cluster head forwarding Way,it effectively reduces the forwarding overhead and reduces the network load.In VANET,the ant colony algorithm is introduced in the route discovery process and route maintenance process,and the main routing information is updated according to the forward ant message and the backward ant message to ensure that the data can transmit data on the efficient and stable route.Packet rate and end-to-end average delay.Modify the routing information table of the node,and store the backup routing information in the table.When the primary routing performance is poor or broken,enable backup routing information,continue to transmit data,reduce packet loss and end-to-end average delay.In the broadcast routing algorithm based on the transmission delay,the vehicle periodically transmits the information to acquire the vehicle position.The vehicle node allows only valid neighbors to broadcast the information.The vehicle node to determine whether it is necessary to broadcast the information received,and then according to the transmission delay time calculation,and then wait for the broadcast,to avoid competition between nodes.The algorithm can effectively eliminate the influence of broadcast storms on information transmission in VANET,and the algorithm can adapt to the change of the number of nodes caused by dynamic topology of VANET.The simulation results show that the proposed algorithm can improve the network receiving rate and the successful transmission rate compared with the existing broadcast routing algorithm.