Intersection-based Routing Protocol for VANET

• Main Authors: Ying-cheng Hsieh, 謝英成
• Other Authors: Li-Der Chou
• Format: Others
• Language: en_US
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/51394056180025110635

碩士 === 國立中央大學 === 資訊工程研究所 === 97 === Vehicular ad hoc network (VANET) is a form of mobile ad hoc network (MANET). Features of VANET are high mobility of vehicles, vehicles move on predefined roads, no power constrains, and rapid topology changes. VANET can be classified into vehicle-to-vehicle (V2V) and vehicle-to-road side unit (V2R). Rapid topology changes uneven distribution of vehicles, and inter-vehicle space is greater than transmission range, resulting in network disconnection. In order to overcome problem, strategy called carry-and-forward is adopt; a moving vehicle holds packets until meeting a new vehicle Before delivering data, vehicles need a routing protocol to select routing paths. Routing path depends on vehicle density or short distance to reduce routing delay and increase packet delivery ratio. Routing path selection is usually based on historical traffic data to find a routing path with minimum routing delay regardless of dynamic traffic condition changes. Routing delay estimation is thus affected by timeliness of historical traffic data. In this paper we propose a routing protocol based on intersections for various vehicular traffic, combines routing path of packets and mobility of vehicles, to reduce probability that packets are carried by vehicles that move toward road segments different from routing paths, the event which results in increase routing delay. We also propose routing delay estimation based on different traffic conditions. In order to obtain traffic conditions to estimate routing delay, while vehicles at the intersection, would exchange collected traffic data from road segments which they have moved through, to estimate routing delay. Simulation results show our routing protocol has better performance in shortening routing delay.