基于弱状态的车载网数据转发策略

发布时间：2018-01-30 21:55

本文关键词： 车载网动态性数据传输位置信息弱状态　出处：《计算机应用》2017年01期 　论文类型：期刊论文

【摘要】：针对车载网(VANET)中车辆高度移动性、拓扑变化动态性等特点所导致的数据转发失败问题,提出一种基于弱状态协议(WSR)下的数据包传输算法——WSFD,实现交通控制中心(TCC)到目标车辆之间的高效数据传输。首先,车辆控制中心将收集到的数据包发送给位于目的车辆方向的接入点(AP);然后,接入点在其通信范围内将数据包转发给某车辆,同时数据包携带上目标车辆位置信息;其次,每次接收到数据包的车辆对比自身所持有的映射,筛选出对于目标车辆位置信息确定性最大的映射与数据包携带的位置信息对比以确定下一步转发方向。若映射置信度较大,则将数据包方向修正为向此映射对应的地理区域中心移动,同时数据包更新包中所携带的目标车辆信息,反之则维持原方向不变。最后经过多次转发修正数据包传输方向,逐渐逼近目标车辆所在的区域,完成最终的数据交付。在30 km×30 km方形区域的数据传输实验中,与TSF与GPSR算法相比,WSFD在数据包的传输延迟上普遍降低至5 s以下,且将数据包投递率提高至0.92。实验结果表明,WSFD能准确高效地传输数据包,在增强了驾驶员的人身安全性同时有效缓解了交通堵塞。
[Abstract]:Aiming at the problem of data forwarding failure caused by the characteristics of vehicle height mobility and topology dynamics in vehicle-borne network (VANET). This paper presents a packet transmission algorithm based on weak state protocol (WSR-WSR-WSFD-WSFDs) to realize efficient data transmission between traffic control center (TCC) and target vehicles. The vehicle control center sends the collected data packet to the access point located in the direction of the destination vehicle. Then, the access point forwards the data packet to a vehicle within its communication range, and the packet carries the location information of the target vehicle. Second, each time the vehicle receives the packet, it compares the maps held by the vehicle itself. The most deterministic mapping for the target vehicle location information is selected to compare the location information carried by the data packet to determine the next forwarding direction. If the mapping confidence is high. The direction of the packet is modified to move to the geographic center corresponding to this map, while the packet updates the target vehicle information carried in the packet. On the contrary, the original direction remains the same. Finally, the transmission direction of the data packet is revised after several retransmission, which gradually approaches the area where the target vehicle is located. In the data transmission experiment of 30km 脳 30km square region, compared with TSF and GPSR algorithm. WSFD generally reduces the transmission delay to less than 5 s and increases the packet delivery rate to 0.92.The experimental results show that WSFD can transmit data packets accurately and efficiently. It enhances the driver's personal safety and effectively alleviates the traffic jam.
【作者单位】：中国矿业大学计算机科学与技术学院;舟山市定海区交通运输局;
【基金】：江苏省产学研联合创新资金前瞻性联合研究项目(BY2014028-09)~~
【分类号】：TN929.5;U495
【正文快照】： 0引言机动车的普及在为人们出行带来方便的同时,也带来了城市道路交通堵塞的问题。以北京为例,城市主干道平均车速较十年前降低了50%以上,且有高达60%以上的交叉路口常发生严重的交通堵塞,严重影响了人们的工作效率和社会发展[1]。研究表明,这一情况通常与驾驶员无法及时掌

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