无线异步转移模式网络结构

无线异步转移模式的网络结构是以在固定ＡＴＭ基础上扩展无线服务为基础的，也京是以固定ＡＴＭ网络为主干网，增加无线接入点，以支持移动性。其网络协议的功能是在进一步改进无线链路性能的同时支持移动性。无线ＡＴＭ的两种模式给出了其网络中可能的工作方式。     

无线ATM及其关键技术

无线ＡＴＭ是支持未来多媒体个人通信的主要技术方案、已成为目前全世界许多组织机构研究与开发的热门话题。本文介绍无线ＡＴＭ概念，若干关键技术及第一你无线ＡＴＭ试验系统。     

无线网络中实现ATM的关键技术

无线ＡＴＭ是异步转移模式（ＡＴＭ）技术和移动通信技术发展产物。ＡＴＭ传输和交换以宽带、低误码率和高传输速率的传输介质为前提，可以提供多媒体服务和广泛的信息接入。而无线停产的传输特点是带宽受限、信道传输质量差和传输误码率高。文中首先介绍无线ＡＴＭ的一般概念，其次说明在无线网络中实现ＡＴＭ技术的关键问题及其解决方法，最后介绍无线ＡＴＭ的网络协议。     

无线ATM网络的媒体访问控制（MAC）

宽带ＩＳＤＮ网络以及无线技术的迅速发展使得对无线ＡＴＭ网络的需求日益增加。本文介绍了无线ＡＴＭ网络的拓扑结构与用于无线网络的媒体访问控制方式，分析了现有的用于无线ＡＴＭ网络的ＭＡＣ的标准的现状，根据ＡＴＭ业务得出了无线ＡＴＭ媒体访问控制（ＭＡＣ）设计的探讨性的结论。     

Classical IP Over ATM规范(下)

ＡＴＭ（异步传输模式）技术是目前最受人瞩目的高速网络技术之一，而如何使ＡＴＭ网络与现有的网络协议（如ＴＣＰ／ＩＰ）相结合是ＡＴＭ技术发展的关键性问题。本文通过对比分析了在ＡＴＭ局域网与传统局域网上ＩＰ协议实现的异同，并较为深入地介绍了在ＡＴＭ上运行ＴＣＰ／ＩＰ协议的技术方案。     

Classical IP Over ATM规范(上)

ＡＴＭ（异步传输模式）技术是目前最受人瞩目的高速网络技术之一，如何使ＡＴＭ网络与现有的网络协议（如ＴＣＰ／ＩＰ）相结合是ＡＴＭ技术发展的关键性问题。本文通过对比分析了在ＡＴＭ局域网与传统局域网上ＩＰ协议实现的异同，并较为深入地介绍了在ＡＴＭ上运行ＴＣＰ／ＩＰ协议的技术方案。     

新一代光纤与无线传输和网络交换技术──香港中文大学光波、无线和组网技术研讨会侧记

本文记述香港中文大学最近举办“光波、无线和组网技术”研讨会的学术报告大致情况。除了香港、新加坡、日本、北京、台北各地代表分别介绍通信网规划研究外，许多专家对国家信息基础设施（ＮＩＩ）、个人通信系统（ＰＣＳ）和鼻步转移方式（ＡＴＭ）三方面作了专题演讲，表达新一代光纤与无线传输和网络交换技术的前景，本文对此作了扼要的侧记。     

移动多媒体通信中无线AIM接入和结构

本文讨论移动多媒体通信中无线ＡＴＭ的基本概念和结构，包括无线ＡＴＭ概念，ＡＴＭ无线接入，无线ＡＴＭ网络，协议，信元和传输结构。研究无线信道给移动多媒体通信带来的影响和解决方法。     

ATM技术的现状与发展趋势

信息高速公路是最近的热门话，在通信界，调整网络技术特别是ＡＴＭ受到人们的普遍关注。什么是ＡＴＭ？它是如何发展起来的？其发展前景如何？本文向读者介绍了这方面的背景材料，阐述了个人的观点，并介绍了ＡＴＭ的典型产品以及ＡＴＭ和Ｂ－ＩＳＤＮ标准化的现状。     

计算机无线局域网技术

计算机无线局域网技术王玉峰９０年代将是网络计算（ＮｅｔｗｏｒｋＣｏｍｐｕｔｉｎｇ）的时代。计算机网络技术一日千里，在高速网络、交换式网络、ＡＴＭ等新技术轰轰烈烈发展的同时，移动数据通信在人们的期待中悄悄地走来，计算机网络又添新成员──无线局域网（Ｗｉ...     

Mobility management in next-generation wireless systems

This paper describes current and proposed protocols for mobility management for public land mobile network (PLMN)-based networks, mobile Internet protocol (IP) wireless asynchronous transfer mode (ATM) and satellite networks. The integration of these networks will be discussed in the context of the next evolutionary step of wireless communication networks. First, a review is provided of location management algorithms for personal communication systems (PCS) implemented over a PLMN network. The latest protocol changes for location registration and handoff are investigated for mobile IP followed by a discussion of proposed protocols for wireless ATM and satellite networks. Finally, an outline of open problems to be addressed by the next generation of wireless network service is discussed     

Multiple access control protocols for wireless ATM: problemsdefinition and design objectives

The concept of wireless ATM is now being actively considered as a potential framework for next-generation wireless communication networks capable of supporting integrated multimedia services with different QoS requirements. Several key subsystem design issues for wired ATM and wireless networks need to be readdressed in the scope of the wireless ATM. One of the main key subsystem issues is the development of the appropriate medium access control (MAC) protocol, which has the capability to extend the statistical multiplexing of the wired ATM network into the wireless medium. In this article the authors address the problem of a suitable MAC protocol for the specification of a wireless ATM network and outline the design objectives. In addition, the authors address some other challenging key issues that the wireless medium and wireless network architecture impose on the ATM stack protocol     

第3代移动通信系统的安全技术研究

从无线链路与ATM网络2方面阐述了第3代移动通信系统的安全问题,重点讨论了将安全层置于ATM协议栈中不同位置时所对应的4种方案,并据此提出了一种可行的ATM安全协议结构.     

一种新的下一代无线个人通信网络

下一代无线通信网络是以用户为中心和异构的,不仅支持网络的自动配置和适应性,而且使用扩展多跳的无线个域网(WPAN)。与此同时,它将以一种透明的方式向用户提供多种类型的服务,这就需要有效地把异构网络技术与不同类型的协议结合起来,形成一个完整的网络体系,网络整合的关键是通过IP技术来达到协议的整合。文中介绍一种新的适用于目前和未来无线个人通信及相关服务的无线个人通信网络架构及其关键技术。     

无线移动信息基础结构

本文首先简述无线移动通信结合发展潮流 ,从模拟至数字 ,即将过渡至宽带和多媒体通信。为此 ,全国无线通信网将推广使用异步转移模式。接着 ,本文说明移动信息基础结构包含接入网和骨干网 ,而且无线基台处于接入网边缘 ,提供移动手机的无线接入。最后指出低轨道 /中轨道卫星族对全球个人通信将起重要作用。     

Performance Evaluation of ABR Flow-Control Protocols in a Wireless ATM Network

Using an object-oriented simulation model of a basic client–server scenario in a wireless ATM network, we study the impact of handover and error-control protocols on the performance of high-speed data communication by the ABR service class. We present performance results of the ABR flow-control protocols ERICA and ERICA+ and discuss some implications for the protocol design.     

无线ATM通信网的关键技术与研究现状

本文介绍支持多媒体业务的无线ＡＴＭ通信网的关键技术，如协议分层模型与网络结构、物理层技术、多址访问控制协议、数据链路控制协议和网络管理与控制技术等，并结合国内外的研究现状进行了论述。     

ATM-based transport architecture for multiservices wirelesspersonal communication networks

This paper presents an ATM-based transport architecture for next-generation multiservices personal communication networks (PCN). Such “multimedia capable” integrated services wireless networks are motivated by an anticipated demand for wireless extensions to future broadband networks. An ATM compatible wireless network concept capable of supporting a mix of broadband ISDN services including constant bit-rate (CBR), variable bit-rate (VBR), and packet data transport is explored from an architectural viewpoint. The proposed system uses a hierarchical ATM switching network for interconnection of PCN microcells, each of which is serviced by high-speed, shared-access radio links based on ATM-compatible cell, relay principles. Design issues related to the physical (modulation), media access control (MAC), and data-link layers of the ATM-based radio link are discussed, and preliminary technical approaches are identified in each case. An example multiservice dynamic reservation (MDR) TDMA media access protocol is then considered in further detail, and simulation results are presented for an example voice/data scenario with a proportion of time-critical (i.e., multimedia) packet data. Time-of-expiry (TOE) based queue service disciplines are also investigated as a mechanism for improving the quality-of-service (QoS) in this scenario     

WATMnet: a prototype wireless ATM system for multimedia personalcommunication

A prototype microcellular wireless asynchronous transfer mode network (WATMnet) capable of providing integrated multimedia communication services to mobile terminals is described in this paper. The experimental system's hardware consists of laptop computers (NEC Versa-M) with WATMnet interface cards, multiple VME/i960 processor-based WATMnet base stations, and a mobility-enhanced local-area ATM switch. The prototype wireless network interface cards operate at peak bit-rates up to 8 Mb/s, using low-power 2.4 GHz industrial, scientific, and medical (ISM)-band modems. Wireless network protocols at the portable terminal and base station interfaces support available bit rate (ABR), variable bit rate (VBR), and constant bit rate (CBR) transport services compatible with ATM using a dynamic time-division multiple-access/time-division duplex (TDMA/TDD) MAC protocol for channel sharing and data link control (DLC) protocol for error recovery. A custom wireless control protocol is also implemented between the portable and base units for support of radio link related functions such as user registration and handoff. All network entities including the portable, base and switch use a mobility-enhanced version of ATM (“Q.2931+”) signaling for switched virtual circuit (SVC) connection control functions, including handoff. In the first stage of the prototype, the application-level API is TCP/UP over ATM ABR service class using AAL5. Early experiments with the WATMnet prototype have been conducted to validate major protocol and software aspects, including DLC, wireless control, and mobility signaling for handoff, Selected network-based multimedia/video applications requiring moderate bit-rates (~0.5-1 Mb/s) in the ABR mode have been successfully demonstrated on the laptop PC