面向城市环境的基于交通灯的时间稳定组播VANETs路由

车载网(vehicular ad hoc networks,VANETs)是由高速移动的车辆构成、自组织分布的无线网络。部署VANETs的目的之一在于提高交通安全、减少交通堵塞,特别是有利于安全消息的传播。然而,城市环境中安全消息的分发受道路结构、红绿灯等因素影响。为此,针对城市环境安全消息的传输问题,提出基于交通灯的时间稳定组播VANETs路由机制T-TSG(traffic light based time stable geocast)。T-TSG依据交通灯的不同情况,确定区播区域(geocast region,GR)、区播消息稳定区域(geocast message stable region,GMSR)以及稳定车辆区域(stable vehicle region,SVR)。仿真表明,提出的路由协议在数据传输率、端到端传输时延、网络开销方面得到提升。

Traffic Light based Time Stable GeocastRouting for urban VANETs

Vehicular ad hoc networks (VANETs) are a self-organizing distributed wireless network formed by highly mobile vehicles. VANETs are designed to support vehicular safety, traffic monitoring. Specially, it is better for spreading safety messages. However, to forward messages in an urban environment is depend on the road topology, traffic lights and other factors. Therefore, in this paper, we have proposed a novel time stable geocast routing protocol named as traffic light based time stable geocast (T-TSG) routing protocol for spreading vehicles after an accident in urban vehicular environment. According to traffic lights, determine geocast region(GR),geocast message stable region (GMSR) and stable vehicle region (SVR). Simulation results show that HLAR has the better robustness in the presence of location errors. Moreover, compared with other similar routing, the that performance of T-TSG is improved in data transmission rate and the end-to-end transmission delay and network overhead.