Research Of Data Distribution And Parking Backbone Network Based On Vehicle Network

With the development of the Internet, many concepts about intel igence have been proposed, including "intel igent transportation system", the ITS. On the other hand, vehicle ad hoc networks, VANETs, is an important part of the ITS, which the industry and academia pay attention to it.Data dissemination is a chal enging problem in vehicular ad hoc networks(VANETs) due to the characteristics of it, such as the highly dynamic topology, the intermittent connectivity, and the road-constrained mobility. Observed from the fact that on street parking is a common phenomenon in the city, the parked vehicles at roadside can also contribute their resources to the communications in network. In this thesis, an efficient data dissemination protocol for VANETS is proposed. Different from the existing works which consider mainly mobile vehicles or some expensive road side infrastructures, this protocol leverages the resources of parked vehicles at roadside to help in forwarding data. It groups the parked vehicles at roadside into a cluster, which buffers and relays data from mobile vehicles and manages the duplicates of data. Simulation results based on a real city map show that the protocol proposed achieves a higher delivery ratio and lower delivery delay.Furthermore, observed from the fact that some specific messages should be transmitted to the certain areas and disseminating within a period of time around the areas. Also, firstly, we leverage the clusters, grouped by parked vehicles to establish a virtual overlay networks for data transmission. Secondly we design an efficient data delivery scheme through the proposed virtual overlay network for transmitting data to the destination cluster. Finally, in the destination area, the pub/sub scheme is adopted to achieve data dissemination within one hop to the parking cluster. Simulation results based on a real city map and realistic traffic situations show that this method achieves a higher delivery ratio with lower network load and reasonable transmission delay.