Onboard Self-organizing Network Communication System Design And Implementation

Under the rapid development of wireless communication technology, there is alarge emergence of wireless communication methods and scientific research fields topromote social progress. The most typical wireless network is mobile ad hoc networks.It has the structure and characteristics that different with the traditional wirelesscommunication network. In the recent years, Vehicular Ad Hoc Network (VANET) isregarded as an important research field and is paid more and more attention.Internationally renowned academic conferences, such as InfoCom and MobiCom isto regard the VANET as an important research field, and carried out many researchprojects in the world. VANET is a typical application of wireless ad hoc networks,wireless communication equipments are installed on the vehicles, driving or parking ofvehicles has become a carrier of the actual node. Thus, the VANET has characteristicsthat different with the traditional wireless ad hoc networks such as vehicle nodes movefast, energy has no constraints, the more stringent delay requirements. We briefly list thevehicle self-organizing network common routing protocols.In this thesis, we focus on the movement of vehicles, and take advantage of thisregularity. From the transportation view, we carry out methods to enable the passengersto communicate with the driving vehicle. From the communication efficiency view, wecarry out methods to enable the driving vehicle to communicate with the stoppedvehicles.We first introduced the importance of the moving model in network simulation.Our approach is to carry a GPS device on the vehicle and record the geographic locationinformation. Then we collect the data and analyze its underlying rule. In the evaluationof VANET performance, the key point is to close to the real driving environment. In theVANET, the driving vehicle is not always following the high-speed or random, drivingpattern. We have found that in VANET, the vehicle nodes move with regularity, and thedriving behavior is closely related to its driver.Secondly, in order to prevent the high delay in message transmission and high cost of building roadside infrastructure in traditional VANET, we propose parked vehicles toform a linear cluster to communicate with the passing vehicle. By studying the rule ofparking vehicles the under the urban environment, we find that the parking vehicle isfollowing the road topology and we can assume the parking vehicles as a linercommunication cluster. When a car drive through this liner cluster, this liner cluster canperform serialized file transfer. Such method of communication reduces the unnecessaryconflict, and greatly reduces the delay of message transmission.Finally, we consider the situation of the real transportation. The efficiency issometimes too low. So we promote the methods that the passengers can communicatewith the driving vehicle. Passengers are enable to broadcast requests to the drivingvehicles that have geographic location information and prediction information. Thevehicle that meet the request can carry out the services to the passenger. After thesimulation, we find that this method not only reduce the time that the passengers waitthe service, but also enhance the efficiency of the transportation.