【作者】 李常茗；

【导师】 李承恕；

【作者基本信息】 北京交通大学 ， 通信与信息系统， 2009， 博士

【摘要】 复合可重构无线通信系统是一种向着未来移动通信系统演进的多制式移动通信网络解决方案,是以欧洲研究为背景的一个未来移动通信系统演进方向。复合可重构无线通信系统由于其具有多种无线接入网络和多模终端,具有比单一无线接入技术构成的通信系统更容易满足第四代移动通信系统各方面要求的特性。这些特性需要从理论上得到支持。本文从理论角度上,建立复合可重构无线通信系统的数学模型。在此模型基础上,从系统的角度讨论将不同的无线通信网络进行复合,对复合可重构无线通信系统的结构、垂直移动性和网络控制等方面进行了讨论,为复合可重构无线通信的发展开启整体性能的讨论。本文讨论的主要问题及创新点有:一、复合可重构无线通信系统的背景、起源以及网络复合概念分析。第一章从4G系统的特点和复合可重构通信系统演进出发,首次详细讨论了网络复合概念,详细区分了异构的无线通信网络结合中网络共存、网络协同、网络融合概念,明确了网络复合和终端可重构的概念。二、复合可重构无线通信系统的结构和无线接入网络选择问题的研究。第二章在欧洲关于复合可重构无线通信系统研究基础上,从各种现有无线通信系统特性入手,从宏观结构、空间结构、逻辑结构、信令结构等角度提出了复合可重构无线通信系统的系统结构。提出了将不同无线通信系统进行复合的方法。三、复合可重构无线通信系统控制问题研究。主要研究的是用户接入控制和基于包交换的流控制方面分析。由于复合可重构无线通信系统的特性,需要采用与以往无线通信网络不同的资源管理技术,采用相对应的准入控制技术。第三章提出了在复合可重构无线通信系统接入网络和核心网络部分所采用的流控制算法。该算法实现流控制时,控制器只需要已知流各节点控制器中队列积压的状态,不需要知道输入速率、信道统计和全网拓扑。算法减轻了系统控制方面的复杂度。四、对复合可重构无线通信系统的垂直移动性分析。垂直移动性问题是复合可重构无线通信系统的特色问题,涉及到垂直切换流程、垂直切换信令流程、切换算法的多个方面。第四章以WCDMA、IEEE802.16e和IEEE802.11g三种无线技术为例,提出了复合可重构无线通信系统的垂直切换流程、切换信令流程,并提出两种多准则判决算法来分析在复合可重构无线通信系统中怎样进行垂直切换判决。五、复合可重构无线通信系统性能分析。在第五章提出了进行性能分析的两种数学模型。该章运用排队理论,将不支持垂直移动性的复合可重构无线通信系统等效成M/H₃/m/m排队系统,将带有垂直移动性的复合可重构无线通信系统等效成M/ME/m/m排队系统,从而对系统的平均服务时间和系统阻塞概率进行分析。在本文最后,进行了总结和对未来研究的展望。更多还原

【Abstract】 Composite reconfigurable wireless communications system is an evolution solution of multi-standard heterogeneous wireless network toward future wireless mobile communications system. It is a solution of future wireless system based on Europe research. With multiple wireless access networks and multi-mode terminals, composite reconfigurable wireless communications system has its characters that can fulfil desired 4G performance than that of single wireless network technology evolution. This needs theory support. From the view of theory, mathematical models of composite reconfigurable wireless communications system are established. Based on the modeling, it was argued in this paper how to compose different wireless networks into composite reconfigurable wireless communications system. And architechture, vertical mobility and network control of composite reconfigurable wireless communication system were analysis in this article. This work is useful for future research on future wirelss communications. In this paper, main topics include:1. Analysis on background, origin of composite reconfigurable wireless communication system and concept of composite network system. In first chapter, from the character of 4G communications system and the evolution of composite reconfigurable wireless communications system, concept of composite netowrk is debated in detail at the first time. Concepts of network coexisting, network cooperating, network composite, network convergence are differentiated. New concept of composite network and reconfigurable terminal is given.2. Research on choosing wireless networks and system architecture of composite reconfigurable wireless communications system. Based on the research of Europe and character of various wireless networks, architecture of composite reconfigurable wirless communications system was presented in macro architecture, space architecture, logic architecture, signaling architecture in second chapter. Methods of composite different wireless networks were presented in this part.3. Research on network control of composite reconfigurable wireless communications system. It mainly concern on user access control and analysis on flow control. It needs new wireless radio resource management and new admission control that was different with that before because of character of composite reconfigurable wireless communications system. Addoped flow control algorithms, every controller just knows the state of backlog in queueing of nodes without knowledge of input rate, channel stastic or whole network topology. This algorithm reduced complex of system in system control.4. Analysis on vertical mobility of composite reconfigurable wireless communications system. Problem of vertical mobility is feature problem of composite reconfigurable wireless communications system. It related to vertical handoff scheme, vertical handoff signaling scheme, vertical handoff algorithms, etc. With three RATs, WCDMA, IEEE 802.16e and IEEE 802.11g chose as example, vertical handoff scheme, handoff signaling scheme were decribed. Two multiple criteria decision making algorithms were adopt for how to make decision in composite reconfigurable wireless communications system.5. Performance analysis on composite reconfigurable wireless communications system. Mathematics modeling is the solution for this problem.Applied queueing theory in this part, composite reconfigurable wireless communications system without vertical mobility was modeled as M/H₃/m/m queueing system, and composite reconfigurable wireless communications system with vertical mobility was modeled as M/ME/m/m queueing system. Mean system service time, system block probability are got by analysis.In final chapter of this paper, conclution and prospect are given.更多还原