导　　师： 贾维嘉

学科专业： 081203

授予学位： 博士

作　　者： ;

机构地区： 中南大学

摘　　要： 随着通信技术和网络技术的迅速发展，网络加速了人们信息交流和协同工作的过程，极大地促进了人类社会的发展。同时，随着无线网络技术的发展，人们希望能够在任何时间，任何地点，以任意的方式高速地使用网络资源。现在无线网络已经能够提供许多原来有线网络才能提供的服务。 相对于有线网络而言，无线网络的带宽资源是非常有限的。为了保证在无线网络中运行的服务能够取得较好的服务质量，更加有效地利用无线网络的带宽资源成为无线网络研究的一个关键问题。本文针对无线网络中的多种服务类型，对无线网络的带宽分配和接入方式进行分析，深入分析了不同类型的网络带宽资源分配和调度算法在运行过程中对网络性能的影响。同时，本文也针对切换服务对无线网络带宽分配的影响情况进行了分析，对切换服务的路由重建方式进行优化，提高网络的实际运行性能。本文的主要研究工作如下： 1、提出了一种分析无线网络带宽分配过程的状态模型。本课题分析了当前存在的部分无线网络带宽分配算法，并根据无线网络带宽分配算法是否使用预留信道，以及如何使用预留信道对当前存在的带宽分配算法进行了分类。通过使用二维马尔可夫模型对这些带宽分配算法的带宽分配过程进行建模，本课题从新建呼叫阻塞率、切换呼叫中断率和无线信道利用率等方面比较了使用不同信道分配算法的无线网络在运行过程中的性能。 2、针对WiMAX网络PMP模式按需分配带宽资源，以及多种数据流类型等特点，本课题提出了一种多重队列对WiMAX网络按用户站分配带宽资源的过程进行分析。本课题通过对基站和用户站的带宽分配过程进行分析，详细描述了基站和用户站在不同运行情况下对到达带宽请求的处理过程，详� With the quick development of communication and network technology, theprocess of information exchanging and cooperation have been accelerated. Meanwhile,with the development of wireless network, people want to access the network servicesat any time, at any place and with any method. A lot of services which were providedby the wired network have been supported by the wireless equipments now.Compared to the wired network, the communication bandwidth in the wirelessnetwork is limited. In order to achieve QoS guaranteed wireless services, efficientutilization of bandwidth resources becomes a fundamental issue. This paper hasanalyzed the bandwidth allocating process of wireless network with different servicestypes and compared the performance of different bandwidth allocating schemes. Atthe same time, this paper also gives an eye to the impact brought by handoff process.We have optimized the handoff rerouting process to improve the performance whenthe handoff process tack place. The main work and contributions are presented in thefollowing aspects. 1. Compared to the wired network, the communication bandwidth in the wirelessnetwork is limited. In order to achieve the QoS guaranteed wireless services, efficientutilization of bandwidth resources becomes a fundamental issue. A number of channelallocation schemes have been proposed to fully utilize the wireless bandwidth, butmany of them just proposed the channel allocation scheme without presenting aspecific channel allocation model. In this paper, we propose and analyze threedifferent channel allocation schemes for wireless networks. We build three systemmodels based on two-dimensional Markov chain to compute the performance of basestation in terms of the new call blocking probability, the handover droppingprobability, and the channel utilization. 2. The IEEE 802.16 MAC, which is connection-oriented, regulates uplinkchannel access using a Demand Assigned Multi Access /(DAMA/) TDMA system. Inthe WiMAX PMP mode, BS control uplink bandwidth allocation and

关 键 词： 无线网络 带宽分配 服务切换 邻居集合 路由重建

领　　域： [电子电信] [电子电信]