宽带无线接入网中的MAC技术

本综述了宽带无线接入网中的媒体访问控制（ＭＡＣ）技术,给出了ＭＡＣ协议的基本概念和构架,分析了其在宽带无线接入网中的作用、功能、以及设计目标,讨论了各种ＭＡＣ协议的动作原理及其优缺点,并指出了ＭＡＣ设计所面临的技术挑战。     

3G无线接入网IP化传送承载方案的研究

本文针对3GPP R5版本后无线接入网(UTRAN)在选择IP化发展背景下对传输承载网络的新需求,分析了RNC和NodeB接口的使用方法和传送承载方式,剖析了3G无线接入网IP化的关键技术,主要研究了基于城域传送网和城域数据网的各种传输承载方案和部署建议.     

3G UMTS网络中的QoS

在介绍3G UMTS网络结构的基础上对UMTS承载业务的QoS的体系结构进行了讨论，并对UMTS网络QoS的要求、QoS的分类、QoS的管理和QoS的属性等关键问题进行了重点分析。     

WCDMA系统中无线接入网建模的研究

本文主要讨论了第三代移动通信WCDMA系统无线接入网（RAN）建模中的几个关键模型的建立，包括典型业务模型和多小区模型，同时在分析WCDMA系统无线接入网结构的基础上，建立了WCDMA系统多业务、多小区的仿真平台，并对这种多业务、多小区情况下的系统容量进行了探讨。     

基于全IP的超三代移动通信系统的QoS支持

超3G的移动通信系统是一种全口的系统，它融合了因特网和移动通信的优点。BRAIN(基于IP的宽带无线接入网)的发展就是要把基于HIPERLAN／2(high performance radiolocal area network type 2)的本地宽带无线接入系统和多个宽覆盖的移动通信系统结合起来，使用户无论是在热点地区还是在移动中都能实现基于口服务的无缝覆盖。能够提供端到端的QoS是在系统设计中的关键环节，因此在系统的应用中，网络以及无线接入层中都必须支持QoS。文中介绍了QoS系统的结构，包括终端结构和基于IP的接入网的结构。     

基于MPLS技术的3G无线接入网络

介绍了第三代移动通信系统(3G)的无线接入网络的体系结构以及所采用的传输网技术。在此基础之上,重点分析了基于MPLS技术的3G无线接入网络方案,并对基于不同传输网方案的3GRAN中的实时业务时延性能进行了仿真比较。分析和仿真结果表明,基于MPLS技术的3C无线接入网络不仅可以提供多种类型业务的区分服务,而且也改善了实时业务的时延性能。     

4G无线接入网拓扑结构展望

第四代移动通信(4G)系统的无线接入网如果沿用传统蜂窝结构,很难满足设计要求.为此文章介绍了可能用于4G系统的改进蜂窝结构,如光纤无线电(RoF)、分布式接收站、多跳无线接入蜂窝、簇-蜂窝,以及全新设计的非蜂窝结构,如Ad hoc和分布无线通信系统.在对这些结构进行了分析对比后,文章认为采用分布式处理/控制和多跳技术的无线接入网比传统蜂窝接入网更符合4G系统的要求.     

3G业务模型分析及无线资源配置

中国联通WCDMA网已进行了三年多的建设,正式运营以来,3G用户快速发展,但WCDMA网无线资源配置依然沿用集团统一模型,资源配置模型已不适用于业务发展.通过分析国内现网典型城市WCDMA网三种主要业务R99、HSDPA、HSUFA的实际模型,结合不同业务对无线网络资源的需求,主要包括CE资源、码资源和功率资源,分析实际业务发展的资源受限条件,给出无线网络资源的配置建议和扩容建议,指导更有效的网络规划建设和无线资源配置方案.     

3G移动通信技术的研究

介绍了TD的标准概念及TD-SCDMA的关键技术和WCDMA标准概况及WCDMA的关键技术。重点介绍中国3G通信运营商标准在技术上的实现,并通过对比双工方式、天线、检测技术、同步方式等核心技术总结出各自在技术上以及实际建网过程中的优缺点,进而结合中国的实际国情,给从事此方面研究的人员提供参考,让3G技术更好的为中国的移动通信服务。     

MINILINK无线传输产品应对3G时代的挑战

凭着迄今为止近50万台终端的交付量,爱立信MINILINK无线传输产品系列在移动网络中扮演着重要的角色。如今．随着3G移动网络的不断推进．新一轮以经济型、部署灵活以及站点间距短为特征的网络部署正拉开序幕。此外,真正从网络的角度考虑基站接入问题,并且以最优化的方式提供站点解决方案的新思路正在逐步取代简单的点对点方式传送业务的传统观念。     

3G无线网络的IP技术研究

论述了当前主要研究的支持3G无线网络的IP技术、移动IP、蜂窝IP、HAWAII和TeleMIP，并对它们进行了比较分析，总结了当前的无线IP技术的特点和发展趋势。     

地铁环境下支持移动IP无线接入点的研究与设计

根据地铁环境下无线通信的特殊性,对无线接入进行了重新设计。研究并继衷了传统移动IP的思想,并对其进行了一定的修改,将移动代理大部分职能与无线接入点进行分离,实现了移动节点与无线接入点之间快速正确切换的功能,在不同的网段中移动时实现了漫游功能,并且实现了有、无线网络的连接畅通。最后描述了系统的测试结果以及存在的不足。     

基于3G网络的远程无线监控系统设计

针对远程无线监控系统的应用需求和移动通信的发展,提出一种基于2G/2.5G/3G网络的远程无线监控系统,设计了系统的总体方案,介绍了系统的组成结构和工作原理,着重阐述了系统的硬件和软件设计。该系统拓展了移动通信网络的应用范围,提高了远程监控系统的灵活性和稳定性,具有广泛的应用前景。     

MCIP: A 3G/IP Interworking System Supporting Inter-Cluster Soft Handoff

In this paper, a novel 3-tier Mobile Cellular IP (MCIP) access network is proposed for interworking between a third generation (3G) wireless cellular system and a wireline Internet Protocol (IP) based network. An inter-cluster hard handoff scheme and an inter-cluster soft handoff scheme are proposed, based on the 3-tier MCIP system model, the core network protocol stacks, and the underlying MCIP routing algorithm. The core network protocol stack is presented to integrate the 3G radio interface and the IP-based core network, and to provide the access network with capability to support soft handoff macroscopic space diversity. The MCIP hard and soft handoff schemes are compared with the hard handoff schemes used in the Cellular IP and HAWAII access networks. The MCIP access network is more efficient in terms of signaling cost, but has the same scalability as Cellular IP and HAWAII. Both MCIP hard and soft handoff schemes enable IP packets to be delivered within the MCIP access network in-order without loss and duplication, a highly desired attribute for real-time multimedia applications. The advantages of supporting soft handoffs and quality-of-service (QoS) provisioning for real-time services are achieved at slightly increased system complexity.This work was supported by a research grant from the Natural Science and Engineering Research Council (NSERC) of Canada. The authors wish to thank the anonymous reviewers for their helpful comments and suggestions which improve the presentation of this paper. Xin Liu received his B.E. and M.E. degrees in radio engineering from Harbin Institute of Technology (China), in 1990 and 1993, respectively, and his M.A.Sc degree in electrical engineering from the University of Waterloo in 2002. He joined Research In Motion in 2002 as a firmware developer. His current work involves GSM/GPRS and WCDMA firmware development. Weihua Zhuang received the B.Sc. and M.Sc. degrees from Dalian Maritime University (China) and the Ph.D. degree from the University of New Brunswick (Canada), all in electrical engineering. Since October 1993, she has been with the Department of Electrical and Computer Engineering, University of Waterloo, Canada, where she is a full professor. She is a co-author of the textbook Wireless Communications and Networking (Prentice Hall, 2003). Her current research interests include multimedia wireless communications, wireless networks, and radio positioning. Dr. Zhuang received the Premier's Research Excellence Award (PREA) in 2001 from the Ontario Government for demonstrated excellence of scientific and academic contributions. She is an Editor of IEEE Transactions on Wireless Communications, an Associate Editor of IEEE Transactions on Vehicular Technology, and an Editor of EURASIP Journal on Wireless Communications and Networking.     

3G网中无线接入网的优化设计

为了降低搜索时间，给出了一种新的第三代移动通信网(3G UMTS)中的无线接入模型，并分析了链路费用、简单切换费用和复杂切换费用对总费用的影响。通过仿真，比较了禁忌搜索算法、模拟退火算法和贪婪算法在给出模型下的总费用仿真结果。     

一种改进的WLAN-3G融合网络认证协议

本文在分析了现有3GPP WLAN-3G融合网络接入认证协议EAP-AKA的优势和不足的基础上,引入WAPI证书鉴别机制,提出WAPI-3G互联结构模型,并针对该互联模型设计了一种接入认证协议EAP-WAPI.本文提议的WLAN-3G互联结构模型及接入认证机制解决了融合组网环境下WLAN终端统一接入认证的问题.分析和仿真结果表明,相比于原有的WAPI认证协议WAPI-XG1,本文所提议的协议具有较高的安全性和执行效率.     

3G本地接入网承载技术方案探讨

随着3G技术及应用的迅猛发展,本地接入网面临着巨大的挑战。在这一背景下,本文讨论了3G本地接入网为适应多业务承载和宽带化所应具备的功能特征,重点阐述了两大类不同的解决方案,即MSTP优化方案和分组化承载方案,全面综述了不同技术的实现方案,并对它们进行了分析和比较,最后对网络的演进提出了进一步的建议。     

异构无线网络可信接入设计及实现

异构无线网络互连后的安全问题是当前网络安全研究的一个热点问题,为了解决异构网络互连后产生的接入安全问题,提出了一种基于信任模型的可信接入框架,该框架建立了异构无线网络间的信任评价体系,对接入异构无线网络用户除了进行身份验证,还必须进行用户信任度的验证,既拒绝了恶意节点接入,又确保了合法节点的安全接入,从而保证异构无线网络互连接入的安全和可信。     

Strongly Consistent Access Algorithms for Wireless Data Networks

In wireless data networks such as the WAP systems, the cached data may be time-sensitive and strong consistency must be maintained (i.e., the data presented to the user at the WAP handset must be the same as that in the origin server). In this paper, we study the cached data access algorithms in such systems. Two caching algorithms are investigated. In Algorithm I, Pull-Each-Read, whenever a data access occurs, the client always asks the server whether the cached entry in the client is valid or not. In Algorithm II, Callback, the server always invalidates the cached entry in the client whenever an update occurs. Analytic models are proposed to evaluate the performance of these algorithms. Our studies show that Algorithm II outperforms Algorithm I if the data access rate is high and the access pattern is irregular. We also design an adaptive mechanism to effectively switch between the two algorithms to take advantages of both algorithms. We also apply the single-level cached data access algorithms for the multi-level cache hierarchy. Our study indicates that with appropriate arrangement, strongly consistent cached data access for wireless Internet (such as WAP) can be efficiently supported.Yuguang Fang received the B.S. and M.S. degrees in Mathematics from Qufu Normal University, Qufu, Shandong, China, in 1984 and 1987, respectively, a Ph.D degree from Department of Systems, Control and Industrial Engineering at Case Western Reserve University, Cleveland, Ohio, in January 1994, and a Ph.D degree from Department of Electrical and Computer Engineering at Boston University, Massachusetts, in May 1997.From 1987 to 1988, he held research and teaching positions in both Department of Mathematics and the Institute of Automation at Qufu Normal University. He held a post-doctoral position in Department of Electrical and Computer Engineering at Boston University from June 1994 to August 1995. From June 1997 to July 1998, he was a Visiting Assistant Professor in Department of Electrical Engineering at the University of Texas at Dallas. From July 1998 to May 2000, he was an Assistant Professor in the Department of Electrical and Computer Engineering at New Jersey Institute of Technology, Newark, New Jersey. From May 2000 to July 2003, he was an Assistant Professor in the Department of Electrical and Computer Engineering at University of Florida, Gainesville, Florida, where he has been an Associate Professor since August 2003. His research interests span many areas including wireless networks, mobile computing, mobile communications, automatic control, and neural networks. He has published over ninety papers in refereed professional journals and conferences. He received the National Science Foundation Faculty Early Career Development Award in 2001 and the Office of Naval Research Young Investigator Award in 2002. He is listed in Marquis Whos Who in Science and Engineering, Whos Who in America and Whos Who in World.Dr. Fang has actively engaged in many professional activities. He is a senior member of the IEEE and a member of the ACM. He is an Editor for IEEE Transactions on Communications, an Editor for IEEE Transactions on Wireless Communications, an Editor for ACM Wireless Networks, an Area Editor for ACM Mobile Computing and Communications Review, an Associate Editor for Wiley International Journal on Wireless Communications and Mobile Computing, and an Editor for IEEE Wireless Communications. He was an Editor for IEEE Journal on Selected Areas in Communications: Wireless Communications Series and the feature editor for Scanning the Literature in IEEE Wireless Communications (formerly IEEE Personal Communications). He has also actively involved with many professional conferences such as ACM MobiCom02, ACM MobiCom01, IEEE INFOCOM04, INFOCOM03, INFOCOM00, INFOCOM98, IEEE WCNC02, WCNC00 (Technical Program Vice-Chair), WCNC99, and International Conference on Computer Communications and Networking (IC3N98) (Technical Program Vice-Chair).Yi-Bing Lin received his BSEE degree from National Cheng Kung University in 1983, and his Ph.D. degree in Computer Science from the University of Washington in 1990. From 1990 to 1995, he was with the Applied Research Area at Bell Communications Research (Bellcore), Morristown, NJ. In 1995, he was appointed as a professor of Department of Computer Science and Information Engineering (CSIE), National Chiao Tung University (NCTU). In 1996, he was appointed as Deputy Director of Microelectronics and Information Systems Research Center, NCTU. During 1997-1999, he was elected as Chairman of CSIE, NCTU. His current research interests include design and analysis of personal communications services network, mobile computing, distributed simulation, and performance modeling. Dr. Lin has published over 150 journal articles and more than 200 conference papers.Dr. Lin is a senior technical editor of IEEE Network, an editor of IEEE Trans. on Wireless Communications, an associate editor of IEEE Trans. on Vehicular Technology, an associate editor of IEEE Communications Survey and Tutorials, an editor of IEEE Personal Communications Magazine, an editor of Computer Networks, an area editor of ACM Mobile Computing and Communication Review, a columnist of ACM Simulation Digest, an editor of International Journal of Communications Systems, an editor of ACM/Baltzer Wireless Networks, an editor of Computer Simulation Modeling and Analysis, an editor of Journal of Information Science and Engineering, Program Chair for the 8th Workshop on Distributed and Parallel Simulation, General Chair for the 9th Workshop on Distributed and Parallel Simulation. Program Chair for the 2nd International Mobile Computing Conference, Guest Editor for the ACM/Baltzer MONET special issue on Personal Communications, a Guest Editor for IEEE Transactions on Computers special issue on Mobile Computing, a Guest Editor for IEEE Transactions on Computers special issue on Wireless Internet, and a Guest Editor for IEEE Communications Magazine special issue on Active, Programmable, and Mobile Code Networking. Lin is the author of the book Wireless and Mobile Network Architecture (co-author with Imrich Chlamtac; published by John Wiley & Sons). Lin received 1998, 2000 and 2002 Outstanding Research Awards from National Science Council, ROC, and 1998 Outstanding Youth Electrical Engineer Award from CIEE, ROC. He also received the NCTU Outstanding Teaching Award in 2002. Lin is an Adjunct Research Fellow of Academia Sinica, and is Chair Professor of Providence University. Lin serves as consultant of many telecommunications companies including FarEasTone and Chung Hwa Telecom. Lin is an IEEE Fellow.     

个人通信接入系统(PAS)的关键技术

在介绍个人通信接入系统（PAS）的体系结构的基础上,进一步阐述了个人通信接入系统的几点关键技术。