车联网中控制信道接入和认知中继选择研究

发布时间：2018-11-17 09:57

【摘要】：随着提升行车安全的需求越来越迫切和无线通信技术的发展,车联网技术吸引了越来越多的关注和研究。车联网的主要目的是通过车与车、车与路边设施的通信,传输行车安全相关的信息和接入互联网的数据包,为驾驶员提供安全舒适的行车体验。车联网通信中由于传输行车安全相关的信息,因此对用户服务质量(Quality of Service, QoS)和通信的可靠性要求十分严苛。而在车联网通信QoS和可靠性的研究中,需要解决严苛端到端时延需求和频谱资源瓶颈两大难题。围绕这两个问题,本文分别对车联网控制信道的接入问题和认知合作车联网的性能优化问题进行了探讨和研究。同时这也是作者在硕士期间参与项目的研究成果,包括：北京市教委项目(基于认知无线电的公交车联网应用技术开发),北京邮电大学优秀研究生创新基金项目。具研究内容如下： 1.首先针对分布式竞争中控制信道接入时延无法保证的问题,研究了车联网中控制信道的接入机制。考虑到车联网多信道操作中时隙交替对接入时延的影响,论文巧妙地利用剩余有效时延控制接入竞争,提出了时延敏感的控制信道接入机制,并通过仿真表明所提算法可以在保证接入成功率的基础上有效提高接入时延的性能。 2.针对车联网频谱资源紧缺的现状,本文通过研究认知合作车联网来扩展车联网可用频谱资源并提高频谱效率。在认知合作车联网中,合作链路的性能与合作中继的选择密切相关。因此,本文首先在单链路场景中,通过求解最大能量效率的优化问题,提出了高能效的中继的选择方案；其次在多链路场景中,通过分析多链路场景下的干扰限制条件,提出基于最优化网络吞吐量的中继选择方案。仿真结果表明,所提的两种中继选择方案分别可以有效提高单链路下的能量效率和多链路下的网络吞吐量。
[Abstract]:With the development of wireless communication technology and the urgent need to improve vehicle safety, vehicle networking technology has attracted more and more attention and research. The main purpose of vehicle networking is to communicate with vehicles, vehicles and roadside facilities, to transmit information related to driving safety and data packets connected to the Internet, and to provide drivers with a safe and comfortable driving experience. Due to the transmission of information related to vehicle safety, the quality of service (Quality of Service, QoS) and the reliability of communication are very strict. In the research of QoS and reliability of vehicle network communication, it is necessary to solve the demanding end-to-end delay requirements and the bottleneck of spectrum resources. According to these two problems, the access problem of the control channel and the performance optimization of the cognitive cooperative vehicle network are discussed and studied in this paper. At the same time, this is the research result of the author's participation in the project during his master's period, including: Beijing Education Commission Project (bus networking Application Technology Development based on Cognitive Radio), Beijing University of posts and Telecommunications excellent Graduate Innovation Fund project. The research contents are as follows: 1. Firstly, aiming at the problem that control channel access delay can not be guaranteed in distributed competition, the access mechanism of control channel in vehicle network is studied. Considering the influence of time slot alternation on the access delay in the multi-channel operation of vehicle networking, this paper skillfully uses the remaining effective delay to control the access competition, and proposes a time-sensitive control channel access mechanism. The simulation results show that the proposed algorithm can effectively improve the performance of access delay on the basis of ensuring the success rate of access. 2. In view of the shortage of spectrum resources in vehicle networking, this paper studies the cognitive cooperative vehicle network to expand the available spectrum resources and improve the spectrum efficiency. In cognitive cooperative vehicle networking, the performance of cooperative links is closely related to the selection of cooperative relays. Therefore, in the single link scenario, by solving the optimization problem of maximum energy efficiency, this paper proposes a high energy efficiency relay selection scheme. Secondly, in the multi-link scenario, by analyzing the interference limitation conditions in the multi-link scenario, a relay selection scheme based on optimal network throughput is proposed. Simulation results show that the proposed two relay selection schemes can effectively improve the energy efficiency and network throughput under single link and multi-link respectively.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U495;U463.67

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