VANET中悬浮信息的分发策略和一致性策略的研究

发布时间：2018-06-06 01:52

本文选题：VANET + 悬浮信息　；参考：《大连理工大学》2015年硕士论文

【摘要】：在车联网(Vehicular Ad Hoc Network, VANET)中,借助悬浮信息(Hovering Information)可以在特定区域内或者时段内进行相应信息的悬浮和分发,从而达到信息共享的目的,如道路安全信息的分发、商业媒体信息的投放等。这样,不仅可以辅助驾驶员及时了解视距外的路况,而且可以帮助驾驶员广泛掌握周边商业信息。车辆高速移动以及道路环境变化会引起VANET的不稳定和不可靠,可能导致悬浮区域内信息分发的不均衡,以及节点上悬浮的信息不一致。如何高效并均衡的分发悬浮信息,并且保证各个节点的悬浮信息的一致性是一个挑战性的问题。本文主要针对VANET中的悬浮信息的分发策略和一致性策略展开讨论和研究。(1)针对VANET中悬浮信息的分发问题,我们采用基于分发路径树DPT(Distribution Path Tree, DPT)的动态洪泛策略。首先,我们将VANET中的悬浮信息分为安全类和媒体类两大类进行讨论。然后,引入链路生存时间LAT (Link Alive Time,LAT),并依此构建带权分发路径树WDPT (Weighted Distribution Path Tree, WDPT)接着,我们根据不同的悬浮信息分发场景,提出了基于路径树的动态洪泛分发策略和基于路由表的表驱动分发策略。最后,我们在ONE (Opportunistic Network Environment,ONE)平台上进行仿真实验,以验证我们提出的信息分发策略的可行性和稳定性。实验结果表明,我们提出的两种类型的分发策略对VANET中的悬浮信息的分发需求都具有明显优势。(2)针对VANET中悬浮信息的一致性问题,我们采用基于Paxos Protocol的一致性策略。首先,我们采用有序存储栈OSS (Order Store Stack, OSS)结构进行悬浮信息和路由信息的存储。然后我们基于Paxos Protocol完成VANET中悬浮信息的决策和更新过程,最终实现悬浮区域内的信息一致性。接着,为了避免活锁问题,我们引入Leader Election方式,进行RSU (Road Side Unit, RSU)的选择过程以优化一致性策略,从而提高系统的稳定性。最后,我们利用开源Paxos框架Zookeepe r模拟VANET中悬浮信息一致性的决策和更新过程,以验证我们提出的一致性策略的可靠性和稳定性。实验结果表明,我们提出的一致性策略能够显著的保证VANET中悬浮信息的内容一致性和完整性。
[Abstract]:In vehicular Ad Hoc Network, VANET), suspension information can be used to suspend and distribute the relevant information within a specific area or within a certain period of time, thus achieving the purpose of information sharing, such as the distribution of road safety information. Commercial media information delivery and so on. In this way, the driver can not only help the driver to know the road condition out of sight in time, but also help the driver to grasp the surrounding commercial information widely. The high speed movement of vehicle and the change of road environment will lead to the instability and unreliability of VANET, which may lead to the imbalance of information distribution in the suspension area and the inconsistency of the information floating on the node. How to distribute levitation information efficiently and equably and ensure the consistency of suspension information among nodes is a challenging problem. In this paper, we mainly discuss and study the distribution strategy and consistency strategy of suspension information in VANET. Aiming at the distribution problem of suspension information in VANET, we adopt a dynamic flooding strategy based on the distribution path tree (DPT(Distribution Path Tree, DPT). First, we divide the suspension information in VANET into two categories: security class and media class. Then, the link survival time (LAT) is introduced, and the weighted distribution path tree, WDPT weighted Distribution Path Tree, WDPT), is constructed according to this, and then we distribute the information according to different suspending information scenarios. Dynamic flooding distribution strategy based on path tree and table-driven distribution strategy based on routing table are proposed. Finally, simulation experiments are carried out on the platform of ONE opportunistic Network Environment one to verify the feasibility and stability of our proposed information distribution strategy. The experimental results show that the two types of distribution strategies proposed by us have obvious advantages in the distribution of suspension information in VANET. (2) to solve the consistency problem of suspension information in VANET, we adopt the consistency strategy based on Paxos Protocol. First, we use the OSS order Store Stack, OSS) structure to store the suspension information and routing information. Then we complete the decision-making and updating process of suspension information in VANET based on Paxos Protocol, and finally realize the consistency of information in suspension region. Then, in order to avoid the problem of live-lock, we introduce the Leader Election method to select the RSU Road Side Unit, RSU) to optimize the consistency strategy, so as to improve the stability of the system. Finally, we use the open source Paxos framework Zookeepe r to simulate the decision-making and updating process of the consistency of suspension information in VANET to verify the reliability and stability of our proposed consistency policy. The experimental results show that the proposed consistency strategy can significantly ensure the consistency and integrity of the suspended information in VANET.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U495;TN929.5;TP391.44

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