部件不可靠下的通信网业务性能分析

分析网络在部件不可靠时的业务性能,通常采用网络状态法,即首先得到不同状态下的性能指标,然后通过状态概率得到平均业务性能.本文将考虑部件可靠性对部件业务性能的影响,提出一种基于不可靠设备业务性能的设备状态法,这相当于仅考虑一个网络状态的业务性能,所以比任何网络状态法简单,而且由于可分析设备失效而中断的业务量,还可以用于分析自愈网的性能.     

Performance Evaluation of Multi-Layer Traffic Engineering Enabled IP-over-ION Networks

Recently, network operators started implementing traffic engineering (TE) techniques in their network. These TE techniques typically involve a single layer (for example, the IP/multi-protocol label switching (MPLS) layer). Although single-layer TE (STE) can improve the network performance (e.g., throughput, quality of service (QoS)), this improvement is bounded by the available capacity in that network layer. The evolution towards intelligent optical networks (IONs) allows further increasing the improvements achievable by the TE techniques, by involving more than one layer in the TE actions. Multi-layer TE (MTE) occupies network resources in a smart way and optimizes the QoS since it dynamically reconfigures the logical topology in the upper layer by properly updating the optical connections in the underlying optical layer. However, the performance of the network is impacted by the configuration scheme adopted by MTE. Therefore, in this paper, we focus on analyzing the influence of the MTE configuration scheme on the MTE behavior, and evaluate the network performance by studying simulation results obtained from a realistic IP-over-ION network.     

Performance Analysis of Maximum SNR Scheduling with an Infrastructure Relay Link

We consider infrastructure-based amplify-and-forward (AF) relaying for extending downlink and uplink coverage areas of a cellular base station. The base station serves multiple mobile users via a multi-hop backhaul relay link by sharing out access link channel resources with maximum signal-to-noise ratio (SNR) scheduling. We analyze the performance of the system by deriving closed-form expressions for outage probability, outage capacity, ergodic capacity, average end-to-end SNR and amount of fading (AoF). These measures show that maximum SNR scheduling of multiple users in a cellular relay link offers significant diversity, capacity and SNR improvement over single-user transmission and round robin scheduling. We also relate performance of the relay link to that of a distributed antenna system (DAS), and show that the noisy wireless backhaul relay link induces tolerable performance deterioration compared to deploying a cable-connected distributed antenna.     

基于GMPLS的多区域／多层面网络的需求分析

主要介绍基于GMPLS的多区域／多层面网络的基本概念与功能需求，并对功能需求分成两个方面进行分析，主要讨论了在该网络体系结构下实现相应的功能需求需要对GMPLS协议进行的扩展以及引入的新机制。     

具有突发业务量成形的ATM复接器的性能分析

分析了综合业务环境下，具有突业务量成形的ＡＴＭ复接器的性能，提出了用间断贝努利过程可近似描述突发源经成形器后的输出过程。用改进的迭代算法，求出了ＡＴＭ复接器的信元丢失率和平均延迟。     

城域网骨干网络业务流量的性能分析

近期研究分析表明很多信息源会产生在多时间尺度下具有自相似特性的信息流，本文分析了西安宽带多媒体城域网骨干网的数据流量分布特性，以及自相似特性，实验表明真实骨干网的流量分布接近正态分布．并且具有共同特性，即左尾比正态分布短，右尾比正态分布长，即正态右偏性。     

我国RFID公共服务体系标准架构分析

针对基于RFID技术的跨企业物品信息交换与共享、物品透明管理和物流过程跟踪等问题,分析并改进了我国RFID公共服务体系标准架构,并对架构中注册服务标准、编码解析服务标准、检索服务标准和信息服务标准等主要部分做出了详细论述。     

电信业务网络架构设计及关键技术分析

电信业务网络是指为实现和保障电信业务开展而组建的软硬件及网络环境,现阶段由于产业环境和需求的变化及软硬件技术的发展,电信业务网络需要升级重构。阐述了目前电信业务网络需求、技术和架构的演变,提出了新形势下业务网络的架构,重点分析了软件定义层关键技术。最后,展望了业务网络发展前景。     

Performance Analysis of an ATM Multiplexer with Multiple QoS VBR Traffic

In this paper, we propose a new queuing model, MMDP/MMDP/1/K, for an asynchronous transfer mode (ATM) multiplexer with multiple quality of service (QoS) variable bit rate (VBR) traffic in broad band-integrated services digital network (B-ISDN). We use the Markov Modulated Deterministic Process (MMDP) to approximate the actual arrival process and another MMDP for service process. Using queuing analysis, we derive a formula for the cell loss probability of the ATM multiplexer in terms of the limiting probabilities of a Markov chain. The cell loss probability can be used for connection admission control in ATM multiplexer and the calculation of equivalent bandwidth for arrival traffic. The major advantages of this approach are simplicity in analysis, accuracy of analysis by comparison of simulation, and numerical stability.     

Performance Analysis of Reassembly and Multiplexing Queueing with Long-Range-Dependent Input Traffic

This paper studies the impact of long-range-dependent (LRD) traffic on the performance of reassembly and multiplexing queueing. A queueing model characterizing the general reassembly and multiplexing operations performed in packet networks is developed and analyzed. The buffer overflow probabilities for both reassembly and multiplexing queues are derived by extending renewal analysis and Bene fluid queue analysis, respectively. Tight upper and lower bounds of the frame loss probabilities are also analyzed and obtained. Our analysis is not based on existing asymptotic methods, and it provides new insights regarding the practical impact of LRD traffic. For the reassembly queue, the results show that LRD traffic and conventional Markov traffic yield similar queueing behavior. For the multiplexing queue, the results show that the LRD traffic has a significant impact on the buffer requirement when the target loss probability is small, including for practical ranges of buffer size or maximum delay.     

IMS中的业务提供

从总体上描述了基于3GPPIMS的业务提供机制,主要阐释了三类业务的提供方式。至于这三类业务提供方式的具体应用,则取决于部署IMS的UMTS运营商的具体需求。     

RPR三种优先级业务的时延吞吐量性能分析

弹性分组环(ResilientPacketRing,RPR)是IEEE802.17正在进行标准化主要用于城域网的新型MAC层协议,也是宽带IP光城域网技术的重要发展方向。RPR在结构上从属寄存器插入环,其时延性能为业界所关注。本文根据RPR包含3个传输缓存的完整模型,利用排队论,对两种转发缓存结构下RPR3种优先级业务的排队时延吞吐量性能进行深入分析并比较,得到最大吞吐量和节点数目的关系、单转发缓存和双转发缓存结构下RPR的3种优先级业务的排队时延吞吐量性能及其对比、排队时延和节点数目的关系等一系列极具参考价值的结果。     

因特网上的MPLS流量工程

主要讨论因特网上多协议标记交换（MPLS）流量工程，首先简述了MPLS、约束路由技术以及增强链路状态内部网关协议，然后讨论了设计MPLS流量工程系统的主要问题，接着说明了配置MPLS流量工程系统的步骤，最后阐述了MPLS网络的QoS机制。     

自相似业务流特性分析

针对ATM网络业务，分析了自相似业务的特性。在理论分析的基础上，构造了仿真模型，进行了计算机仿真，并给出了计算机模拟仿真结果。     

Analysis of Traffic Access Control Strategies in Integrated Service Networks

A common digital transmission facility provides service to a community of heterogeneous users generating traffic with differing intensity, message length, and bit rate. In order for this type of integrated communication system to handle its traffic demands with high efficiency and flexibility, close control of access and switching at the input node is required. We propose, analyze, and compare two different strategies for managing the access of two types of traffic, a blockable wide-band (WB) type of traffic and a queueable narrow-band (NB) type of traffic, sharing the transmission resource dynamically. The first strategy assigns preemptive priority to the WB traffic over the NB traffic, whereas the second strategy employs a wide-band to narrow-band bit rate compression mechanism. Exact analytic models are developed, and solution methods are presented and implemented. It is shown that the best combined performance is obtained when the two strategies are adaptively combined according to the offered load.     

IDC——新型信息服务基础设施

因特网数据中心作为网络基础设施的一部分,提供高端的数据传送服务和高速接入服务。作为企业、商家或网站服务器托管的场所,IDC为各种模式电子商务的发展准备了基础设施,成为参与企业以及商业联盟创造价值的平台。     

自相似业务合成流的建模及排队性能分析

近期起初网络流量分析表明很多信息源会产生在多时间尺度下具有自相似特性的信息流,据此人们采用模拟及分析的方法对此种业务流对ＡＴＭ交换机／复用器性能的进行了研究,发现了与传统短打关模型完全不同的排除生但是到２为止对于自相关信息流的复用问题尚未发现有要进行研究。而这个问题的解决对自相似业务流条件下的ＡＴＭ交换机／复用器性能分析,接入控制（ＣＡＣ）等都具有很重要的意义。本文基于临界时间尺度的概念对这个问题     

自相似业务在波长变换全光网络的动态性能分析

本文对自相似业务在波长变换光网络的动态性能进行了研究。通过在不同的九节点格型网上进行仿真,分析了拓扑类型对动态性能产生的影响,并与相同条件下的泊松业务进行了对比。     

信道成组ATM交换系统中混合业务的性能分析

本文分析了信道成组ＡＴＭ交换系统中混合业务的性能。混合业务包括突发业务和随机业务，为了满足两类业务不同的服务质量要求，本文将部分缓冲共享方案略作修改。用一个二维Ｍａｒｋｏｖ链来描述交换系统的状态，用Ｇａｕｓｓ－Ｓｉｅｄｅｌ迭代法求解系统稳态方程。研究了业务平均突发长度、缓冲门限、业务量及信道成组技术对系统性能的影响。模拟结果与理论分析吻合。     

基于自相似业务的波长变换光网络性能分析

对自相似业务在波长变换光网络中的动态性能进行了研究,分析了在各种因素如自相似业务参数(Hurst参数、均值M、方差V)以及网络参数(光纤数F、波长数W)对自相似业务波长变换增益产生的影响,并对结果进行了讨论。