车载通信网络中基于网络连通编码的传输控制优化研究

发布时间：2018-05-28 01:30

本文选题：车间时距 + 连通性　；参考：《南京邮电大学》2017年硕士论文

【摘要】：我国经济正在持续快速地发展,随之而来的是国民综合生活水平的提高,作为汽车大国行列中的一员,人们对交通道路的需求也就变得越来越多。车辆自组织网络作为在交通系统的具体应用,从而受到了越来越多的关注。随着交通道路需求的不断增多,对车辆自组织网络中数据传输的要求也就越来越高,人们不仅要求能够获取信息,而且对获取信息的时间和信息质量等的要求也越来越高。因此,如何提高车载通信网络中数据传输的时效性是目前研究的一个热点。本文主要研究高速车载通信网络中基于网络连通编码的数据传输优化。主要研究内容如下:首先,数据的传输必须建立在车辆间能够通信的基础之上,为了确定车辆间在何种状况下能够保持高效的通信,本文从车间时距的角度出发,提出了一种适用于车载通信网络的连通性分析模型。首先结合车辆行驶速度和方向等因素,分析了车间时距的分布函数,最终确定车辆间连通性计算模型。仿真结果表明了车辆间连通性与单位时间内车辆到达数和平均交通密度等的关系,同时对高速公路状况下的最佳通信距离进行预测分析,这一研究结果为本文后续研究数据传输提供了连通保障。其次,在传输范围内的车辆保持良好连通的情况下,对于不能直接进行通信的车辆,需要为它们选择一个或多个中继,从而保证间接通信。本文选择道路上的其他车辆作为中继,并将车辆连通性、交通密度和信道状况作为选择的依据,提出了一种基于连通性集成线性网络编码的多径传输控制协议。首先为了确保数据包在何时进行网络编码,给每个车辆节点设置了缓存区,并将数据包在缓存区的时间阈值作为数据包编码时刻的依据。在确定编码时机后,数据包将在发送车辆节点处进行编码,通过中继车辆节点进行传输,最后在目的车辆节点进行解码,将原始数据包还原。实验结果表明,所提出的集成线性网络编码的多径传输控制协议在路由开销和数据分组的包交付率等重要性能方面有明显的改善,能够有效解决车载通信网络中数据传输效率低的问题。
[Abstract]:The economy of our country is developing continuously and rapidly, with the improvement of the comprehensive living standard of the people, as a member of the automobile big country, people's demand for the traffic road becomes more and more. As a specific application in traffic system, vehicle ad hoc network has attracted more and more attention. With the increasing demand of traffic road, the demand for data transmission in the self-organized vehicle network becomes more and more high. People need not only to obtain information, but also to obtain the time and quality of information. Therefore, how to improve the timeliness of data transmission in vehicular communication networks is a hot topic. In this paper, data transmission optimization based on network connection coding in high speed vehicular communication network is studied. The main research contents are as follows: firstly, the transmission of data must be based on the communication between vehicles. In order to determine the conditions in which vehicles can maintain efficient communication, this paper starts from the angle of workshop time distance. A connectivity analysis model for vehicular communication networks is proposed. Firstly, the distribution function of workshop time distance is analyzed according to the driving speed and direction of vehicle. Finally, the model of vehicle connectivity is determined. The simulation results show the relationship between vehicle connectivity and vehicle arrival number and average traffic density per unit time. At the same time, the optimal communication distance under the condition of expressway is predicted and analyzed. The results of this study provide a connectivity guarantee for the further study of data transmission in this paper. Secondly, under the condition that the vehicles in the transmission range remain well connected, one or more relays should be selected for the vehicles which cannot communicate directly so as to ensure indirect communication. In this paper, other vehicles on the road are selected as relays, and vehicle connectivity, traffic density and channel conditions are taken as the basis for selection. A multipath transmission control protocol based on connectivity integrated linear network coding is proposed. Firstly, in order to ensure that the data packet is encoded in the network, the buffer area is set up for each vehicle node, and the time threshold of the data packet in the cache area is taken as the basis of the data packet encoding time. After determining the encoding time, the data packet will be encoded at the sending vehicle node, transmitted through the relay vehicle node, finally decoded at the destination vehicle node to restore the original data packet. The experimental results show that the proposed multipath transmission control protocol integrates linear network coding significantly improves routing overhead and packet delivery rate of data packets. It can effectively solve the problem of low data transmission efficiency in vehicular communication network.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5;U495

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