【作者】 王怡轩；

【导师】 曾志民；

【作者基本信息】 北京邮电大学 ， 通信与信息系统， 2008， 硕士

【摘要】 为了满足日益增长的高速移动数据业务,特别是移动互联网业务的需求,无线宽带接入系统同蜂窝移动通信系统一样,也在迅速发展。宽带无线接入技术作为下一代通信网中最具发展潜力的接入技术之一,正受到业界越来越多的关注。全球微波接入互操作性(WiMAX,World Interoperability forMicrowave Access)属于新一代宽带无线城域网(WMAN,WirelessMetropolitan Area Network)接入技术,而基于IEEE 802.16e的WiMAX技术一般称作移动WiMAX,它作为一种新的宽带无线解决方案,利用通用的广域宽带无线接入技术和灵活的网络架构,促进了移动和固定宽带网络的融合。2007年2月,ITU-R WP8F工作组向各国发出通函,希望展开对IEEE 802.16e是否能够成为IMT-2000的标准之一的评估工作。基于IEEE 802.16d标准的产品已经验证可以提供具有QoS质量保证的VoIP(Voice over Internet Protocol)业务,而移动WiMAX系统更加复杂,对业务的时延、连续性要求更高,许多问题需要解决。本论文首先介绍了宽带无线接入和无线城域网技术,对基于IEEE 802.16e的WiMAX系统的系统架构和关键技术进行了分析,并对WiMAX系统仿真的目的和方法进行了简要说明。接着着重介绍了对移动WiMAX系统仿真平台的总体设计和各模块的具体设计,重点分析了VoIP业务模型以及WiMAX系统资源调度时部分使用子信道的情况。最后着重介绍了对移动WiMAX系统仿真平台的实现,通过对链路级参数、L2S接口参数以及系统级参数进行设定,针对VoIP业务输出上下行链路的仿真结果,完成对系统性能的评估。更多还原

【Abstract】 In order to satisfy the growing of high-speed mobile data services, especially the demand for mobile Internet business, wireless broadband access system is also developing rapidly like cellular mobile communication system. As one of the most potential access technologies in the next-generation communications networks, broadband wireless access technology is getting more and more attention.World Interoperability for Microwave Access is a new-generation broadband wireless metropolitan area network access technology. WiMAX technology, which based on IEEE 802.16e, is generally known as mobile WiMAX. As a new solution of broadband wireless access technology, it uses common wide area broadband wireless access technology and flexible network architecture to promote the combination of mobile and fixed broadband networks.In February 2007, ITU-R WP8F Working Group issued a circular to all countries, hoped to start the evaluation of IEEE 802.16e to become one criteria of IMT-2000. Products based on IEEE 802.16d standard can provide a proven quality assurance of VoIP (Voice over Internet Protocol) services. Mobile WiMAX system is more complex, the delay requirement is higher, and many issues need to be solved.This paper introduced broadband wireless access and wireless metropolitan area network technology at first, analyzed the system architecture and key technologies of WiMAX system based on IEEE 802.16e, and described aims and methods of WiMAX system simulation briefly. Then the paper focused on the overall design and the specific modules design of simulation platform for the mobile WiMAX system, especially the VoIP model and resource scheduling mechanism in mobile WiMAX system.Finally the paper particularly described the realization of simulation platform for the mobile WiMAX system. After setting link-level parameters, L2S interface parameters and system-level parameters, simulation results of uplink and downlink were shown, and the evaluation of system performance in view of VoIP was completed.更多还原