DS域中一种补偿CIR体现公平性的流量控制方法

本文针对CIR因素引发的不公平性问题，基于公平性原则给出了一个补偿CIR的通信量调整方法。在这种方法下，为较高CIR付费的用户能享受不低于为较低CIR付费的用户的超出带宽，并且通过模拟验证了算法的公平性。     

一般信元速率算法分析

文章经过对一般信元速率算法的分析，认为该算法对ATM网的流量控制与拥塞控制有一定效果。     

ATM网络ABR业务流量控制算法的优化研究

文中介绍了ATM网络的基本概念、ABR服务类型。将有效的活动数VC引入到该算法中,使系统能快速达到稳定状态。通过提出一种快速减小反馈时延的算法对ATM网络ABR业务的流量控制进行了优化,实验表明：该算法可以使ATM网络减少拥塞,提高系统的性能,最终使网络达到最佳工作状态。     

多业务接入系统流量管理技术及其实现

通过分析基于ATM的多业务接入系统对流量管理的要求 ,对大唐电信光通信分公司开发的基于ATM的多业务接入系统 (LinkMasterA - 10 0 )中采取的流量管理技术 ,包括连接接纳控制、使用参数控制、加权公平排队、拥塞控制、帧丢弃、流量整形等算法及其具体实现进行了介绍与探讨     

简单网络管理协议SNMP在数据网络监控中的两个应用

LAB认为,就目前的情况看,SNMP变得非常流行,已经变成了对基于IP的网络的管理数据进行报告的工业标准。在这里介绍SNMP在数据网络监控中的两个应用：实时监测网络时延、实时绘制ATM/FR电路流量和电路告警。     

图像识别技术在银行ATM监控的应用

分析了银行原有自动柜员机监控的方式和原理。对ATM的监控方式、配置做了基本的描述,并对银行为提升ATM安防管理水平,而采取的监控联网措施和功能性做了分析。对现有ATM监控系统出现的主要问题、存在的缺点和目前我国ATM安保管理问题的严重性做了详细说明。文中介绍了图像识别技术在ATM监控系统中的应用,以及在ATM监控中所起...     

PTN网络的QOS端口限速部署策略研究

文章主要研究PTN(Packet Transport Network)网络在轻载的情况下通过优化QOS(Quality of Service)部署,即在QOS端口限速部署时改变PTN网络中LTE业务的CIR(Committed Information Rate)值和PIR(Peak Information Rate)值,实现相较规划时接入更多数量的业务,从而达到充分挖潜现网带宽资源的目的,降本增效。     

基于大客户网管系统实现重要政企客户的全业务监控

通过清理完善资源系统资源信息、完善资源接口机同步程序、完善专业网管与大客户网管系统的接口程序和告警采集、派发策略,并依据设定的门限建立重点客户的异常流量监控与预警机制和提供相应报告,在武汉电信大客户网管系统上实现大客户的SDH、PR(A)、DDN、ATM等全业务监控,达到及时主动发现隐患/故障、及时定位和及时处理的目的,以期在客户服务感知上进行有益探索.     

神经网络在ATM流量控制中的应用

以ATM流量控制的三层结构模型为基础，介绍神经网络在接入允许控制（CAC）中的五种算法——学习控制方法、hybrid允许方法、移动窗口训练方法，BPHT算法和时间-差分学习方法。讨论基于神经网络的流量测量、流量管理和拥塞控制方法。性能分析结果表明神经网络提供了快速、自适应、简单的智能控制。     

EIR在国内移动通信系统中功能缺失分析

3GPP规范定义了各网元及在移动通信系统中的位置和功能,但国内各大移动运营商的网络中均存在EIR功能缺失的现状。为了解决EIR功能缺失给公众和行业带来的不利影响,通过分析EIR的工作过程和国外已有的EIR应用场景,建设性地提出一些举措和方案以规范国内移动运营商将EIR功能落到实处。     

MULTICAST ROUTING SCHEMES IN ATM

In this study, we investigate the problem of accommodating multicast traffic in ATM networks, with emphasis on the virtual path (VP) environment. We propose a network structure called “virtual copy network” that is suitable for multicast communication and connection setup scheme, taking into account the VP environment. With our technique, we can expect statistical multiplexing gain in accommodating multiple multicast traffic streams over a VP. Also, we propose two multicast routing algorithms (the CNR-LH algorithm and the improved CNR-LH algorithm) for an ATM network environment. In these algorithms, in addition to determining an adequate route, the exact corresponding VPs on the route are also obtained. We examine the efficiency of the algorithms by demonstrating their basic characteristics using computer simulations.     

Performance analysis of path rerouting algorithms for handoffcontrol in mobile ATM networks

This paper studies the effects of user mobility and handoff path rerouting on the traffic distributions in a mobile network environment. In mobile ATM networks, extra traffic load may be added to network links due to user mobility and handoff path rerouting. This requires higher network link capacity and possible topology reengineering in order to support the same quality of service (QoS) for mobile services. To capture the dynamic variations in mobile ATM networks, we propose to use a flow model. The model represents the mobile-generated traffic as a set of stochastic flows over a set of origin-destination (OD) pairs. The user mobility is defined by transfer probabilities of the flows and the handoff path rerouting algorithm is modeled by a transformation between the routing functions for traffic flows. The analysis shows that user mobility may cause temporal variations as well as smoothing effects on the network traffic. Using the flow network model, typical handoff path rerouting algorithms are evaluated through both analytical and experimental approaches. The evaluation methodology can be used for either redesigning the network topology for a given path rerouting algorithm or selecting a path rerouting algorithm for a given network topology under a specific mobile service scenario     

An empirical evaluation of virtual circuit holding time policies inIP-over-ATM networks

When carrying Internet protocol (IP) traffic over an asynchronous transfer mode (ATM) network, the ATM adaptation layer must determine how long to hold a virtual circuit opened to carry an IP datagram. We present a formal statement of the problem and carry out a detailed empirical examination of various holding time policies taking into account the issue of network pricing. We offer solutions for two natural pricing models, the first being a likely pricing model of future ATM networks, while the second is based on characteristics of current networks. For each pricing model, we study a variety of simple nonadaptive policies as well as easy to implement policies that adapt to the characteristics of the IP traffic. We simulate our policies on actual network traffic, and find that policies based on least recently used (LRU) perform well, although the best adaptive policies provide a significant improvement over LRU     

基于ATM的MPLS流量工程研究

研究了基于ATM的MPLS,重点研究和分析了具体实现MPLS流量工程的ATM流控措施、使用约束路由的标记分发协议、路由协议,为MPLS流量工程的具体实施提供了参考。同时研究了MPLS多协议标记交换技术融合IP路由技术、ATM的QoS（Quality of Service）及交换技术,使得流量工程模式可以部署在基于IP的网络,其中包括ATM网上承载IP业务的模式。     

Voice over ATM: an evaluation of network architecture alternatives

This article describes eight application scenarios in which there is a business case for voice over ATM. It then evaluates alternative network architectures for implementing the required network functionality. The article incorporates much of the ongoing work of the ATM Forum and the ITU, but does not restrict itself to standards and implementation agreements. In addition, it evaluates nonstandardized alternatives for ATM transport of voice traffic. There are two main areas: N×64 kb/s structured data transfer, also known as composite cell transport-a network operator may aggregate individual voice calls into N×64 kb/s blocks for transport to an intermediate point in the network. At that point the individual calls need to be remapped into new M×64 kb/s blocks for the next stage of their transport. Architectural alternatives and advantages of remapping are investigated. Interworking of signalling is of two types: network interworking, in which the end users are connected to non-ATM networks and an ATM network is used for backbone transport; and service interworking, in which an ATM user is connected to a non-ATM user. Functionality and architectural alternatives for network and service interworking are evaluated     

Measurement-based simulation model for TCP over ATM

Cell level analysis of ATM networks by means of simulation requires an accurate model for traffic sources. We present a simple model for TCP over ATM traffic sources in an ATM LAN, which captures the fundamental characteristics of the behaviour of tcp in this environment. The model was developed by extensive statistical analysis of numerous traffic traces recorded in an atm testbed. Simulated traffic generated by our model has roughly the same properties as observed in real traffic, even on the time scale of milliseconds. This makes it suitable for use by the analysis of various scheduling and congestion management algorithms.     

TCP/IP在ATM网络中的性能分析和优化

分析了造成ＴＣＰ／ＩＰ在ＡＴＭ上性能低的原因,以提高链路利用率和吞吐量为目的对ＴＣＰ协议进行了改进,提出了两种解决方法：反馈重传策略和分组级的流量成形,来提高ＴＣＰ／ＩＰ在ＡＴＭ网络上的性能。     

Developing a cohesive traffic management strategy for ATM networks

The background and some of the rationale for the development of an asynchronous transfer mode (ATM) traffic management framework to support the wide variety of services to be carried over the B-ISDN are discussed. The advantages of statistical, as opposed to deterministic, multiplexing are examined. Given the anticipated B-ISDN service characteristics, two classes of quality of service are defined based on cell delay and cell loss. The key ATM traffic management tools are reviewed. These tools are broadly classified as either preventive, limiting the total amount of traffic admitted to the network in order to virtually eliminate probability of cell-level congestion, or reactive, assisting the network and individual connections to avoid the onset of congestion and minimize its severity when it does occur. A strategy for the initial introduction and the long-term evolution of an ATM traffic management framework is described     

Production-quality video over broadband networks: a systemdescription and two interactive applications

The Washington University MultiMedia eXplorer (MMX) is a complete, host-independent multimedia system capable of transmitting and receiving JPEG-compressed video, CD-quality audio, and high-resolution radiographic images over the Washington University broadband ATM network. If the host is equipped with an ATM interface card, normal network traffic can be supported via an ATM extension port on the MMX. The major components of the MMX are an ATMizer and three multimedia channels. The ATMizer implements the host interface, the interface to the ATM network, and the interface to the three multimedia channels. This paper describes the architecture of the MMX, the software used with the system, and two applications that have been developed to demonstrate the capability of broadband ATM networks for multimedia applications