文档介绍：地理信息系统 6120130052 廖雯婧 I 车载自组织网络中一种连通度感知的可靠数据分发机制摘要摘要车载自组织网络可以通过多跳无线广播实现远距离的数据传输,但网络拓扑的快速变化和无线通信质量的不稳定会导致数据传输性能的不稳定. 为了应对这些挑战, 文中提出了一种适用于城市场景的可靠的、连通度感知的数据分发机制. 该机制利用实时收集的交通流量数据,建立路口车辆排队长度变化的马尔可夫模型,并基于此模型估算路段间无线网络连通度的实时变化,以便数据沿最小延迟路径进行转发. 该机制还考虑到城市环境对无线信号的干扰,用覆盖消除规则改进了贪心广播算法,通过多候选转发策略增强了路段间数据传输的可靠性. 模拟实验结果表明,与基于传染病的数据分发协议、基于静态节点的自适应数据分发协议相比,文中提出的机制能实现高可靠、:车载自组网络;数据分发;连通度感知;可靠传递 II On Connectivity-Aware and Reliable Data Dissemination in s Abstract In s(Vehicular Ad-works) , data can be transmitted to long - distance targets through multi -hop wireless broadcast ,but the rapid changes work topology and unstable munication quality will cause performance unsteady for data transmission over s. To meet the challenges ,a reliable and connectivity aware data dissemination mechanism which is applicable to urban scenarios is proposed. The proposed mechanism uses the traffic flow data collected at intersections in real - time to build a Markov model of queue length change of vehicles , and then estimate the rea l- time varying of connectivity of works on the roads of two adjacent intersections so as to choose the minimum delay path to forward the data. For reliable data transmission , an improved greedy broadcast algorithm which merges into coverage elimination rule and multicandidate strategy is also designed to ease the interference of urban environments. The simulation experimental results show that our mechanism can achieve high reliable and low - delay data dissemination parison with the epidemi c- based protocol and the stati c- node-assisted adaptive data dissemination protocol. Keywords : ; data dissemination; connectivity-aware; reliable delivering 地理信息系统 6120130052 廖雯婧 III On Connectivity-Aware and Reliable Data Dissemination in s Abstract In s , data can be transmitted to long - distance targets through multi -hop wireless broadcast ,but the rapid changes work topology and unstable munication quality will cause performance unsteady for data transmission o