【作者】 刘莉；

【导师】 冯玉珉；

【作者基本信息】 北京交通大学 ， 通信与信息系统， 2008， 博士

【摘要】 为移动用户提供多种信息业务是未来无线通信网络的主要发展方向。本论文从提供业务的角度出发，通过无线多业务网络的资源管理问题的研究，给出了相应的算法及解决方案，包括单层蜂窝网的接入控制、带宽分配等，和双层蜂窝网的业务建模、动态资源分配策略及其层选策略等问题，主要的工作及创新点在于：针对无线网络的多媒体业务，提出了一种呼叫接入控制优化算法(CAC-RA)，此算法通过采用马尔科夫方法，排队论和非线性规划模型，同时解决呼叫允许控制和资源优化分配问题。提出的利益函数考虑了最大利用资源，同时满足无线网络各类用户的QOS要求。引用等效带宽的思想得出CDMA系统容量，将提出的CAC-RA算法应用于CDMA系统。针对单业务分层蜂窝网，提出一种层间联合的业务模型(Layer-united)和一种用户分类建模分析方法(User-classified)，研究双向溢出策略的双层蜂窝网结构，用户根据其移动速度进行接入层选择。两种模型将宏小区和微小区相互结合，考虑上下层的相关性，因此提高了准确度。研究一种支持多种业务(语音对话业务和数据流业务)的分层蜂窝网，在动态资源分配策略下的网络性能。此动态资源分配策略根据当前的业务负载情况动态分配数据流业务带宽，并通过双阈值带宽预留(DTBR)来保证不同业务的质量要求(QoS)。分析网络性能时使用用户分类分析思想生成两个二维马尔可夫调制的泊松过程(MMPP)来描述快速用户业务模型和慢速用户业务模型。研究应用动态资源分配策略的多业务分层蜂窝网，在信道共享和信道分割两种资源分配策略下的网络性能。微小区层作为“热点”小区层嵌入宏小区层中。使用用户分类分析思想分析多业务蜂窝网的网络性能，生成0类用户模型和1类用户模型。提出了两种分层小区系统的多业务公平速率分配和层选策略。两种速率分配策略(公平速率分配和比例公平速率分配)综合考虑了信道质量和传输功率条件和接收台的最小信噪比等。两种速率分配策略考虑到与基站不同距离的移动台间的公平性的同时最大利用系统资源，提高吞吐量。基于对上下链路的速率分配策略，相应的提出了前向链路和反向链路的层选策略，使分层小区的总吞吐量达到最大。除用户速度外，层选策略考虑的因素还有宏小区和微小区的资源情况。在蜂窝ad hoc网络的基础上，提出一种分层蜂窝ad hoc网结构(HCA)，它融合了分层蜂窝网络(HCS)和移动ad hoc网络(MANET)两种网络结构。通过马尔科夫模型对此网络业务量进行分析基础上提出用户的选择策略，满足用户需求的前提下提高网络容量并达到网络资源的合理利用。更多还原

【Abstract】 future wireless communication systems trend to provide multi-services to mobile users. The dissertation studies on the problems of resource management of wireless multi-services networks, which include admission control and optimal bandwidth allocation of multi-services in one-layer cellular networks, resource management and layer selection of multiservice hierarchical wireless networks. The major achievements in the dissertation are outlined as follows.> Multimedia traffic is classified into two classes: real-time traffic and non real-time traffic. An optimal call admission control algorithm (CAC-RA) is proposed which manage call admission control (CAC) and optimize resource allocation (RA) together by adopting Markov Decision Process approach, queuing theory and formulating a nonlinear programming model. The CAC-RA scheme is employed in a multi-service CDMA communication system in which the concept of equivalent bandwidth is introduced..> a new general bidirectional call-overflow scheme for a two-tier HCS, which allows calls to overflow between the macrocells and microcells and layer selection in hierarchical architecture based on the velocity of the mobile making the calls, is considered. In order to evaluate the performance of such hierarchical systems, an layer-united microcell (macrocell) model are developed. Considering the correlation between microcell layer and macrocell layer, the models is more practical and accurate.> A hierarchical cellular network carrying multiple service classes is considered, where dynamic channel assignment is implemented. In the dynamic channel assignment scheme, the bandwidth of data streaming services can be dynamically allocated according to the current traffic loading in the system. and the different Quality of Service (QoS) requirement from diverse applications is guaranteed through dual threshold bandwidth reservation (DTBR). Two two-state Markov Modulated Poisson Process (MMPP) are developed to approximate fast users traffic and slow users traffic respectively through the concept of user-classified (fast user and slow user) analytical method.> The performance of a hierarchical cellular network carrying multiple service classes under channel sharing and channel partitioning, where dynamic channel assignment is implemented , is researched. A microcell with high-traffic density is located at the center of the host macrocell. The user-classified analytical method in which users is classified to user 0 and user 1, is developed to calculate the system performance.> Two rate allocation schemes ( Fair Rate Allocation and Proportional Fair Rate Allocation ) and layer selection solutions of the forward and reverse link for adaptive multimedia services in hierarchical cellular network are developed. Two rate allocation schemes proposed jointly adapts the transmitted power, the quality of channel assigned to each MH for receiving/transmitting its data bits, and transmitted power for a base station and MHs. Based on the two rate allocation schemes of forward and reverse link and velocity of MH, layer selection solutions of forward and reverse link in hierarchical cellular network are developed accordingly to achieve the maximum of the total throughput in Hierarchical Cellular Structures (HCS).> A Hierarchical Celluar Ad Hoc Hybrid Network (HCA) is proposed, which integrate network achitecture both Hierarchical Celluar Structures (HCS) and Mobile Ad Hoc Network (MANET). A Markov Modulated Poisson Process (MMPP) model is developed to analyze the performance of such hybrid network. The capability of the network is enhanced and traffic of cellular is balanced, thereby calls blocking probability and forced termination probability are declined.更多还原