无线移动网络与业务的发展及其关键技术研究

文章探讨了B3G无线移动通信网络的发展方向,指出了以用户为中心,面向市场的多业务智能异构泛在网络是新一代无线移动网络的重要特征。并基于多无线电技术、环境感知技术和协作技术研究了未来无线移动网络和业务融合的体系框架,探讨了AN网络和AUN网络的技术及构建方法,设计了基于多种关键技术的智能多业务的异构协作网络体系。     

下一代移动无线互联网络的发展趋势

随着无线网络逐步向着高速化、宽带化、智能化、泛在化的特性发展，各种各样的无线通信技术接踵而至，带来了丰富的异构性．为满足人们对业务的需求，提出了一种新颖的网络构架——移动泛在业务环境（MUSE），MUSE构架的设计还面临着一些技术上的难题．未来网络发展的主导趋势是以IP核心网为平台，进行网络的融合演进和协同优化．     

泛在网络资源管理模型的研究

泛在网络作为未来网络,存在自治性、异构性、复杂性、混沌性等挑战。泛在网络计算环境下资源的组织与管理、竞争与共享、分配、负载均衡等问题成为泛在网络发展的障碍。结合移动Agent技术,提出了一种基于移动Agent的泛在网络资源管理层次模型,为使用者提供一个分布的、易于扩展的、高效实用的泛在网络计算环境。     

融合创新推动NGN前行

目前,人们对通信的需求呈现宽带化、个性化、综合化的特征.为了满足人们多样化的需求,基于固定电话网、移动电话网和互联网多种异构网络融合,并且能够提供多媒体综合业务的、开放的下一代网络(NGN)成为未来网络的必然发展趋势.     

未来移动通信的发展趋势

在移动通信网络朝着高速化、宽带化、泛在化发展的过程中,出现了多种多样的通信技术,为其带来了丰富的异构性。未来移动通信系统构想了一个无所不在的、提供普适服务的、开放融合的、以用户为中心的无线世界。     

异构个人域网络中的服务发现机制

个人周边智能设备与移动业务的融合促进了服务发现机制的发展,智能设备的增加和移动性也使得现有服务发现机制很难在用户移动当中始终提供有效服务。在对个人周边的异构网络特征分析的基础上,利用组播和信息熔合等技术,提供了一套适用于节点具有群组移动性、异构性的动态网络的可靠的服务发现机制,并且不会消耗过多的系统带宽资源。     

无线电国际国内管理政策研究

随着技术发展，无线电通信宽带化、移动化、网络化的趋势越来越明显，网络融合、泛在网络、物联网等名词成为未来信息网络发展的关键词。大量涌现的宽带无线接入技术为固定网络和移动网络的融合，计算机网络、移动通信网络、广播电视网络和传感器网络的融合提供了基础性的技术桥梁。可以预见，未来的通信网络及业务在融合的大趋势下将产生翻天覆地的变化，由于无线业务的存在，固定和移动业务的分界将不再明显，取而代之的将是一个无处不在的，广泛连接“人与人”、“人与物”、“物与物”的综合信息网络。     

面向空天地一体化网络的移动边缘计算技术

空天地一体化通信网络是未来6G移动通信系统的重要发展趋势,能真正实现全球全域的"泛在连接"。考虑到空天地一体化网络的多层异构性,引入移动边缘计算(Mobile Edge Computing, MEC)技术可为用户提供各种数据业务计算服务的支持。首先,对空天地一体化网络中的天基网络、空基网络、地基网络以及MEC技术分别进行了概述,并讨论了引入MEC技术对空天地一体化网络带来的优势。其次,分别对低轨(Low Earth Orbit, LEO)卫星-MEC融合网络架构、高空平台(High Attitude Platforms, HAPs)-MEC融合网络架构、无人机(Unmanned Aerial Vehicle, UAV)-MEC融合网络架构以及空天地一体化网络(Space-Air-Ground Integrated Network, SAGIN)-MEC融合网络架构进行了介绍,并讨论了这4种架构的应用场景。最后,探讨了空天地一体化网络架构中安全性、移动性管理等关键性挑战问题。     

异构无线网络融合切换算法研究

异构无线网络融合和泛在化是未来宽带无线通信发展的必然趋势。文章首先概述了移动性管理;然后对切换进行了分类,讨论了各种切换策略;最后讨论了混合网络垂直切换策略,不同网络间的快速无缝切换是未来异构无线网络的一个极大挑战。     

移动广播组播技术与网络融合

本文针对目前的移动广播组播业务研究热点,综述并分析了广播网络、蜂窝网络及各种异构网络的网络融合方式与典型的解决方案,探讨了未来移动广播组播技术与网络融合的发展趋势.     

一个移动通信增值应用系统

通过对现有移动通信网络及其特点的分析,达到为不同的用户访问时提供不同服务的目的,本文介绍了一个移动通信增值应用系统的设计框架及相应的实现方法,它具有WAP查询服务、短消息服务、通用门户站点服务、证券查询服务、话费查询服务、电子邮件服务等功能特点.此外,还可方便地进行扩展,应用于较大规模的移动网络中.     

Mobile next-generation networks

Mobile next-generation networks (NGNs) are a necessary element in reaching the goal of truly ubiquitous computing. The Universal Mobile Telecommunication System, the third-generation mobile service concept, is a technology step to mobile NGNs. We can view NGNs as a merger of the Internet and intranets with mobile networks and with media and broadcast technologies. The Universal Mobile Telecommunication System (UMTS) is-from a radio perspective-a third-generation cellular technology, which is defined by the International Telecommunication Union (ITU) in its IMT-2000 framework (2001). From a conceptual point of view, it represents a technology step to mobile NGNs' facilitating ubiquitous computing. Researchers conceived UMTS to combine Internet protocol (IP) and mobile technologies to offer personal communication and personalized content everywhere. Its goal is to apply Internet protocols for mobile services control and end-to-end applications. By analyzing the trends of key technologies, we can see how they drive the evolution of the Internet and mobile communications toward mobile NGNs. In this article, I describe the IP-based approach of UMTS for the provision of mobile multimedia services. The integration of WLAN into the UMTS architecture could indicate that the field is moving toward separating mobile and fixed Internet.     

A perspective on the evolution of mobile communications

This article outlines the current state of mobile communications and presents some of the future directions in research and development from the perspective of NTT DoCoMo with special emphasis on the market in Japan. It first describes the directions in which mobile communications are expected to forge ahead in the future, and the service implementation strategies they could employ. Then it describes an example of mobile multimedia services and present an outline of the Freedom of Mobile Multimedia Access (FOMA), which is a service based on the 3G mobile communications system called International Mobile Telecommunications-2000 (IMT2000). This is followed by an overview of our R&D approach to 4G systems, which constitute mobile communications systems of the future, and the profile of technologies to make these happen. Finally, it reviews our approach to future technologies that are expected to be realized in 4G and subsequent systems, and illustrate it with an example of a research project.     

Toward Efficient Service-Level QoS Provisioning in Large-Scale 802.11-Based Networks

Along with recent advances in mobile networking and portable computing technologies, there is a trend in the telecommunications industry toward the development of efficient ubiquitous systems that can provide a set of bandwidth-intensive and real-time services to multiple users while supporting their full mobility. Large-scale deployment of 802.1 1-based technologies will play an integral part in the construction of such ubiquitous wireless mobile systems. A challenging task in the development of such networks is efficient provisioning of QoS-enabled services for mobile users. In this context, we propose a scheme that constantly monitors the overall network performance to perform admission control and traffic conditioning at the 802.11-based access points and mobile terminals. The focus is on service-level fairness, where different flows from the same traffic class can still receive the same QoS level even if they have different bit rates. Furthermore, given the mobility of users, the success of any resource allocation and admission control model depends on the continuity of QoS guarantees across different WLANs. This article proposes a dynamic service level agreement negotiation protocol that allows mobile terminals to perform handoffs between different WLANs while maintaining the agreed level or service. End users also can change their service levels in response to changes in network conditions.     

基于地面广播的手机电视

手机电视业务可以利用蜂窝移动网络和地面/卫星数字广播来实现,其相关技术有4种:基于移动网实现技术、基于地面数字广播网实现技术、基于卫星实现技术和基于应用层实现技术。DVB-H和T-DMB是2种典型的地面数字广播电视标准,前者是DVB组织为通过地面数字广播网络向手持终端提供多媒体业务所制订的传输标准,后者是韩国推出的基于欧洲厂商开发的尤里卡147数字音频广播(Eureka-147DAB)的地面数字多媒体广播标准。目前开展手机电视业务面临着标准、频率资源、管制和终端等方面的问题,其运营模式存在移动运营商单独运营、广电单独运营和两者合作运营模式3种。手机电视是广电和通信产业融合的重要尝试,主管部门的协调和技术标准的制订将直接影响未来三网融合的进程。     

全球移动视频的发展

移动视频业务正通过移动网络和移动终端为移动用户传递视频内容的新型移动业务，是当前和未来移动运营商和终端制造厂商新的业务增长点。有的业务目前在2．5G网上就能提供，而有些则必须通过3G网络才能实现。目前移动视频业务在日本和韩国发展较快，领先于欧美市场。     

社会协同创新与物联网产业发展

文章认为物联网产品创新机遇除了网方面的突破,还有物方面的创新,这需要工业设计、行业知识与信息技术等多个学科的协同创新。在物联网市场方面,需要考虑移动泛在业务环境(MUSE)、WoT等一些将物联网与移动通信和互联网相结合的模式。这些技术能带来规模化市场和更加开放的商业模式,降低整个产业推进的成本,对物联网产业健康发展至关重要。     

基于移动蜂窝网的定位技术探讨

移动蜂窝网本身就具有一定的定位服务,在5G新基建的支撑下,定位服务进一步增强,定位精度也大幅提升。在5G新基建的移动互联网时代,定位服务获得了前所未有的关注与青睐。结合多年在定位服务领域的研究,文章对基于移动蜂窝网的定位服务进行了综述,分析了各类定位技术的优势与不足,总结了定位服务的指标体系,通过行业的用例对定位服务进行了说明。文章对移动蜂窝网的定位服务进行梳理,旨在为研发与管理人员提供支撑。     

Research activities on next-generation mobile communications and services in Korea

In this article we present a perspective on next-generation mobile communications and services. As a preliminary research work on next-generation mobile communications, we exploit what next-generation mobile services will be (S. Ryu et al., May 2003). We define next-generation mobile services as a hierarchy of services consisting of three different service levels: the service areas, the service functionalities, and the service technologies. We derive these service levels by means of scenario-based analysis. Next we propose conceptual reference network architecture, focusing on the realization of the service technologies. We divide the network into four different parts: a user equipments and access part, a network service provisioning layer part, a network control layer part, and non-mobile network operator service pan, according to characteristics of information and service flows within a network. In this reference network architecture, service elements such as servers, processors, and gateways are placed in each network part to support the derived next-generation mobile services. Finally, we give a brief introduction of research and development activities for next-generation mobile communication systems and services in Korea.     

中国移动多媒体广播（CMMB）技术分析

随着广播电视的数字化及移动技术的相互融合,中国的手机电视业务发展迅速,以手机电视为代表的移动多媒体广播（CMMB）在奥运会期间发挥了重大作用,成为现在的热点话题。对CMMB手机电视业务的网络框架、标准、各种技术：信道传输技术、信源编码和解码、时间分片技术等方面进行了阐述,最后给出了CMMB的发展前景和优势,在不久的将来,CMMB移动多媒体技术必将成为中国主流的技术。