基于ieee 802.16e跨层网络架构和分组调度算法的研究based on the ieee 802.16 e cross-work architecture and packet scheduling algorithm research.docx

摘 要
IEEE ,CDMA2000,TD-SCDMA之后3G的第四个标准, 它填补了城域网无线传输技术的空臼,符合未来通信技术的发展趋势。IEEE MAC层协议对QoS服务流和参数配置信令体系、基于QoS的调度服务类别以及相应的带宽请求/分配信令等进行了定义,但是把QoS参数映射、接纳控制、流量整形、分组调度算法等一系列重要的问题留待开发者来解决。
本文对现有协议结构和信令体系进行研究的基础上,提出了一种基于IEEE 的跨层QoS网络架构,对原有的QoS结构进行了扩展,在MS端增加了缓冲模块,流量控制模块,在BS端增加了接纳控制模块,并且考虑了物理层的自适应调制编码方式。本文设计的接纳控制算法,对不同业务计算预留带宽,优先保证漫游业务的接入,算法能根据不同业务类别和物理层带宽的变化作出自适应接纳判决,在保证各业务QoS要求的同时能有效防止网络拥塞,提高了带宽利用率,
本文分析了现有的有线,无线调度算法的特点,针对现有的WiMAX系统调度方案的不足:没有考虑当前无线信道状态,当高优先级业务量增大时,低优先级业务服务得不到保证,从而提出了改进的两级分组调度方案,第一级调度采用动态加权公平队列(DWFQ:Dynamic Weighted Fair Queuing)算法,并在NS2平台上验证。仿真结果表明:改进方案与以前调度方案(第一级调度采用DFPQ算法)相比,在业务吞吐量,带宽利用率,以及对不同业务的时延保证优于后者,算法在保证不同业务QoS的同时,体现了较好的公平性。
关键词:IEEE :跨层:接纳控制:分组调度:公平性.
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Abstract
IEEE standard, which following WCDMA,CDMA2000,TD-SCDMA, is the fourth of 3G standards, it fills gaps of MAN with wireless transmission technology and in line with the future development trend munication standard specifies QoS signaling mechanisms such as bandwidth request/allocation and scheduling service ,the standard leaves some important issues such as QoS parameter mapping, admission control, traffic shaping, and packet scheduling algorithm, problems are expected to resolved by the developers.
In this thesis, the protocol structure and signaling framework of IEEE are analyzed and efficient cross-work architecture is proposed to support QoS in IEEE the MS side, the Buffer Module and Traffic Control Module are added, the Admission Control Module is added at the BS side, considering the Modulation and Coding mode of physical layer. In the admission control algorithm utilizing cross-layer design, calculating reserved bandwidth for different services, it gives priority to ensuring roaming service access. When making the admission decision, it is adaptive according to the traffic type and wireless-channel results show that the algorithm can pr