基于卫星导航的车联网中汽车位置管理策略研究
发布时间：2018-10-17 09:22
【摘要】：位置管理的目的是使系统能够高效地跟踪移动用户的位置,确保当寻呼到来时能迅速精确的找到被叫移动用户并建立通信链路,均衡位置更新和位置寻呼的资源开销,达到高效的利用网络资源从而避免造成不必要浪费的目的。在位置管理策略中,性能分析是确定位置管理策略和设计网络架构的关键指标,并通过网络信令开销分析来评价策略的性能。当前我国汽车保有量大幅上涨,交通越发拥挤,为了满足车辆移动性需求,并充分利用网络资源,迫切需要一种新的适应于车联网特征的汽车位置管理策略。本文对车联网体系架构和当前已有的位置管理策略做了详细研究,根据地理特性和交通特性设计基于卫星导航的车联网位置管理拓扑结构,并根据基础网络建设特点将其划分为路网区域和非路网区域。在路网区域中,利用卫星导航技术中网络RTK的实时高精度特性,设计基于网络RTK的车联网路网区域位置管理模型,并验证观测时间与基线长度对定位精度的影响。建立车联网数据库部署模型和通信机制,进一步将路网结构划分为城镇二维动态位置区拓扑和非城镇一维k度重叠位置区拓扑,设计基于GAW的高精度双重越区策略对车辆越区行为管理。对城镇拓扑提出一种基于三层区域的动态车辆位置更新策略和基于车辆行驶方向矢量的三步寻呼策略。对非城镇拓扑引入最近交互小区和入口小区概念,抵消了乒乓效应的影响提高了寻呼效率。在非路网区域中,提出基于北斗RNSS/RDSS双模组合技术的位置管理模型,在此基础上设计了一个基于动态距离和时间增强型的位置管理策略,并利用真实车辆GPS数据对策略进行分析,划分不同行驶特性车辆运算得出非路网区域中最佳距离门限,分析寻呼率对系统位置管理开销影响。利用Matlab软件对车联网路网区域中位置管理策略进行仿真和性能分析,对该区域两种车联网结构在VS2010上分别编写软件模型来验证策略可行性。针对非路网区域无通信基站特性,利用真实车辆GPS数据库编写分析程序,设计数据结构对大量车辆数据进行分析验证。对路网区域策略与传统静态策略相对比,验证表明,本文所提出的位置管理策略能够明显减小位置管理开销,在车联网中拥有良好的前景。
[Abstract]:The purpose of location management is to enable the system to track the location of the mobile user efficiently, to ensure that the called mobile user can be quickly and accurately located and to establish a communication link when the paging arrives, and to balance the resource overhead of the location update and the location paging. To achieve efficient use of network resources so as to avoid unnecessary waste. In the location management strategy, the performance analysis is the key index to determine the location management strategy and design the network architecture, and the performance of the strategy is evaluated through the network signaling overhead analysis. In order to meet the demand of vehicle mobility and make full use of network resources, a new vehicle position management strategy is urgently needed to meet the needs of vehicle mobility and make full use of network resources. In this paper, the architecture of vehicle networking and the existing location management strategies are studied in detail. According to the geographical characteristics and traffic characteristics, the location management topology of vehicle network based on satellite navigation is designed. According to the characteristics of basic network construction, it is divided into road network area and non-network area. In the area of road network, the real time and high precision characteristic of network RTK in satellite navigation technology is used to design the position management model of vehicle network based on network RTK, and to verify the influence of observation time and baseline length on positioning accuracy. The vehicle network database deployment model and communication mechanism are established, and the road network structure is further divided into two dimensional dynamic location region topology of town and one dimensional k-degree overlapping position area topology of non-town. A high precision dual handoff strategy based on GAW is designed to manage vehicle overtaking behavior. A dynamic vehicle position updating strategy based on three-layer region and a three-step paging strategy based on vehicle direction vector are proposed for urban topology. The concepts of the nearest interactive cell and the entrance cell are introduced to the non-urban topology, which counteract the effect of ping-pong effect and improve the paging efficiency. In the non-network area, a position management model based on Beidou RNSS/RDSS dual-mode combination technology is proposed. On this basis, a position management strategy based on dynamic distance and time enhancement is designed, and the strategy is analyzed using real vehicle GPS data. The optimal distance threshold in the non-road network area is obtained by dividing the vehicle operation with different driving characteristics, and the influence of paging rate on the system location management overhead is analyzed. The simulation and performance analysis of the position management strategy in the area of vehicle network are carried out by using Matlab software. The software models of the two kinds of vehicle networking structures in this area are written on VS2010 to verify the feasibility of the strategy. In view of the characteristics of the base station without communication in the non-network area, the analysis program is written by using the real vehicle GPS database, and the data structure is designed to analyze and verify a large number of vehicle data. Compared with the traditional static strategy, the results show that the proposed location management strategy can significantly reduce the overhead of location management, and has a good prospect in vehicle networking.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U495;TN967.1
，
本文编号：2276218
[Abstract]:The purpose of location management is to enable the system to track the location of the mobile user efficiently, to ensure that the called mobile user can be quickly and accurately located and to establish a communication link when the paging arrives, and to balance the resource overhead of the location update and the location paging. To achieve efficient use of network resources so as to avoid unnecessary waste. In the location management strategy, the performance analysis is the key index to determine the location management strategy and design the network architecture, and the performance of the strategy is evaluated through the network signaling overhead analysis. In order to meet the demand of vehicle mobility and make full use of network resources, a new vehicle position management strategy is urgently needed to meet the needs of vehicle mobility and make full use of network resources. In this paper, the architecture of vehicle networking and the existing location management strategies are studied in detail. According to the geographical characteristics and traffic characteristics, the location management topology of vehicle network based on satellite navigation is designed. According to the characteristics of basic network construction, it is divided into road network area and non-network area. In the area of road network, the real time and high precision characteristic of network RTK in satellite navigation technology is used to design the position management model of vehicle network based on network RTK, and to verify the influence of observation time and baseline length on positioning accuracy. The vehicle network database deployment model and communication mechanism are established, and the road network structure is further divided into two dimensional dynamic location region topology of town and one dimensional k-degree overlapping position area topology of non-town. A high precision dual handoff strategy based on GAW is designed to manage vehicle overtaking behavior. A dynamic vehicle position updating strategy based on three-layer region and a three-step paging strategy based on vehicle direction vector are proposed for urban topology. The concepts of the nearest interactive cell and the entrance cell are introduced to the non-urban topology, which counteract the effect of ping-pong effect and improve the paging efficiency. In the non-network area, a position management model based on Beidou RNSS/RDSS dual-mode combination technology is proposed. On this basis, a position management strategy based on dynamic distance and time enhancement is designed, and the strategy is analyzed using real vehicle GPS data. The optimal distance threshold in the non-road network area is obtained by dividing the vehicle operation with different driving characteristics, and the influence of paging rate on the system location management overhead is analyzed. The simulation and performance analysis of the position management strategy in the area of vehicle network are carried out by using Matlab software. The software models of the two kinds of vehicle networking structures in this area are written on VS2010 to verify the feasibility of the strategy. In view of the characteristics of the base station without communication in the non-network area, the analysis program is written by using the real vehicle GPS database, and the data structure is designed to analyze and verify a large number of vehicle data. Compared with the traditional static strategy, the results show that the proposed location management strategy can significantly reduce the overhead of location management, and has a good prospect in vehicle networking.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U495;TN967.1
，
本文编号：2276218
本文链接：https://www.wllwen.com/kejilunwen/wltx/2276218.html
