基于网络编码的车联网数据分发策略研究

发布时间：2018-03-13 17:16

本文选题：车联网　切入点：数据传输　出处：《湖南理工学院》2017年硕士论文　论文类型：学位论文

【摘要】：智能交通系统是缓解交通问题的有效方法,车联网作为智能交通系统的主要组成部分被广泛关注。在传统的移动通信协议中,中间节点仅仅对收到的数据信息进行存储转发,但数据量大时这种方式会使得中间节点成为瓶颈节点,应用网络编码技术可达到网络传输的最大容量。将网络编码运用到车联网中,对车联网产生的大数据信息流进行压缩,可达到提升车联网服务质量的目的。本文主要研究基于网络编码的数据传输技术,针对高密度交通环境车联网吞吐量不高等问题,提出了适用于高密度交通环境的基于网络编码的车联网数据分簇传输协议。该协议采用分块有序随机线性网络编码,根据通信链路质量动态更新冗余编码包个数,并通过将编码矩阵中特定元素置1的方式降低解码复杂度。传输策略上采用基于分簇的车辆节点协同转发,采用ACK确认的逐级确定性重传。实验表明,该协议在数据传输效率、转发延迟、吞吐量等方面均表现出较好的性能。针对稀疏交通环境车联网数据传输时延较大等问题,提出了适用于稀疏交通环境的基于网络编码及交通轨迹的数据转发协议。协议采用“携带+连通组件”思想,通过建立端对端传输延迟模型,提出在路口接入点协助下基于最小传输延迟期望的多径转发原则。理论分析及仿真实验结果表明,提出的协议在稀疏交通环境下表现出较好的数据传输延迟性能。
[Abstract]:Intelligent Transportation system (its) is an effective method to alleviate traffic problems. As the main component of its, vehicle networking is widely concerned. In traditional mobile communication protocols, the intermediate nodes only store and forward the received data. However, when the amount of data is large, this way will make the intermediate node become the bottleneck node, and the network coding technology can achieve the maximum capacity of network transmission. The network coding is applied to the vehicle network, and the big data information flow generated by the vehicle networking is compressed. This paper mainly studies the data transmission technology based on network coding, aiming at the problem of low throughput of vehicle network in high-density traffic environment. A networked data clustering protocol based on network coding is proposed for high density traffic environment. The protocol adopts block ordered random linear network coding and dynamically updates the number of redundant packets according to the quality of communication link. The decoding complexity is reduced by placing a specific element in the coding matrix. In the transmission strategy, the vehicle nodes based on clustering are co-forwarded, and the hierarchical deterministic retransmission confirmed by ACK is adopted. The experiment shows that the protocol is efficient in data transmission. Forwarding delay, throughput and other aspects have shown good performance. In view of the problem of long transmission delay in sparse traffic environment, A data forwarding protocol based on network coding and traffic path is proposed for sparse traffic environment. The protocol adopts the idea of "carrying connected components" and builds end-to-end transmission delay model. A multipath forwarding principle based on the expectation of minimum transmission delay is proposed with the help of access points at intersections. Theoretical analysis and simulation results show that the proposed protocol performs well in sparse traffic environment.
【学位授予单位】：湖南理工学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5;U495

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