移动应用中基于物理隔离的数据同步方法

随着嵌入式技术、现代通讯技术的发展以及新一代通讯标准的出现,使得人们使用大规模智能移动设备进行移动计算成为可能。本文针对移动应用提出了一种在物理隔离网络环境下的数据同步方法,介绍了应用的背景,对同步系统进行总体设计,详细说明了数据同步操作的步骤及过程,然后详细论述了同步过程中冲突的检测、处理规则。采用增量式的同步方法,减少了数据交互量;同时,内外网物理隔离,保证了数据的安全性。     

基于VxWorks的3G技术统一平台

针对不同标准的3G技术,从技术开发者的角度,提出基于VxWorks环境下建立3G底层技术统一平台的设想,介绍该统一平台的体系结构,阐述各个子系统的功能。从用户产品的角度,介绍内部实现原理和基本业务流程,为下一步的研发工作提供一个开发平台。实际测试表明了该平台的有效性。     

第三代移动通信三大标准浅析

本文介绍了第三代移动通讯的三大标准及其技术特点。并从技术、商用两个角度做出横向对比分析．阐述了各自的优势与缺欠。     

wmATM enhanced software definable radio system

Driven by the markets and subscribers, broadband telecommunication services are getting more and more significant throughout the world. ATM and Internet technologies are taking the leadership in this storm to bring up the new era of information society. Wireless mobile communication is a very potential system in view of its low cost as well as flexible coverage. Constructing a new broadband, high-speed wireless mobile telecommunications, with full compatibility to existing wireless standards will become an emerging demand in the following years. This kind of system can provide real-time multimedia communications, including voice, data and video to each mobile user or host, and support free roaming and handover any time, anywhere and for anyone. Hence, an intelligent broadband software definable base station is proposed to reflect the advancement of the next generation wireless mobile communications. wmATM (wireless mobile ATM) based software radio will greatly contribute to this technology and enhance the system's performance.     

多机器人系统的一种快速会话建立方法

H.324M作为多媒体移动终端的标准,使得多机器人系统的实时多媒体通讯成为了可能。在H.324M的基础上,针对数据传输的多路技术,开发了一种高效的移动多媒体传输协议栈,一个机器人能够同时处理两个或者更多的信息,使得多机器人系统能够加速会话建立、进行多媒体通讯。理论与实验结果表明,该方法相对于H.324M中推荐的方法,会话建立时间缩短了约50%。     

基于AHP移动终端系统的安全风险评估

随着移动通信和终端技术的发展,移动智能终端已经广泛应用于人们的日常生活,未来将更多地融合到各种信息系统中,因此对移动智能终端系统进行安全风险评估成为必要。本文结合相关标准和当前移动智能终端面临的主要安全威胁,提出智能终端系统安全风险评估的概念;针对移动智能终端系统安全评估缺乏必要的模型描述,提出了一种基于AHP算法的智能终端系统安全风险评估模型,利用AHP算法对其进行安全风险评估,计算出各评估要素的相对风险程度和整个智能终端的安全风险等级,有利于建立分级的风险评估机制。     

MNCRS: industry specifications for the mobile NC

In June 1997 an industry consortium announced that it was working on a mobile extension of the Open Group's Network Computer Reference Profile (NCRP) to address the unique requirements of the many new mobile computing devices. This specification will propose a set of standards for developers deploying a Java based light weight network computing solution for mobile use. It will also include a new set of trimmed down Java APIs to support disconnected operation, secure remote access, manage power requirements, and ensure device adaptivity to different network environments. The Network Computer Reference Specification (NCRS) defined a network computer (NC) as a lightweight, ubiquitous, extensible, secure, and easy to administer system using widely deployed technologies such as HTTP, HTML, and Java to ensure universality. The Mobile Network Computer Reference Specification (MNCRS) extends the concept of a network computer to define a mobile network computer (MNC). The extension will define open standards that specify APIs visible to applications, network protocols, and server interactions. Naturally, these standards will have implications for software developers, original equipment manufacturers, operating system vendors, and service providers. Since the intent is to enable MNCs and servers from various manufacturers to interoperate, the consortium will adopt industry standards wherever possible. Accordingly, ongoing convergence efforts with entities such as the NCRP and the Internet Engineering Task Force are intended to avoid duplication of efforts in overlapping areas such as security, communications, tunneling     

移动通信安全技术分析

随着移动技术的高速发展,在目前生活中,移动通信已成为人与人之间不可缺少的一种通讯方式.因其可移动性、便捷性深受大家喜爱.但是移动通信过程中,通讯信息有时可能遭受恶意侵害.在移动通信不断发展的今天,移动通信安全技术的发展也尤为重要,在方便快捷的移动通信过程中,都不希望自己的隐私、利益受到侵害.本文主要介绍移动通信的不安全因素,可能受到的安全威胁,之后介绍移动安全的几种技术手段.     

灰色关联度分析法在机场噪声监测点集中的应用简

机场噪声监测点的噪声值与多方面因素相关,例如天气、温湿度、航迹、机型等,研究这些影响因素,对于科学有效地降低噪声值有着至关重要的地位。本文采用灰色关联度分析的方法对同一航班不同机型的影响因素进行了分析,并通过实例加以验证。结果表明,灰色关联度分析方法在对于影响噪声值条件的选择具有可行性。     

基于Funambol架构的移动数据同步系统模型的研究

在嵌入式系统与其他通信设备的数据同步方面,业界曾经有过不少标准与产品：基于Palm的HotSyne、MicrosoftMobile的Active Sync．Intellisyne等。但从2002年已经逐渐稳定并得到广泛应用的统一的标准——SvncML已经逐渐显现出“开放平台”给自己带来的优点,并已经在国内产生了巨大影响。基于SyncML技术,结合FunambolDS应用,提出一个开放移动数据同步系统模型,完善、拓展了同步所有这些平台、设备之间的数据．     

基于IP技术的移动广播系统初步设计

随着人们生活质量的不断提高,使得各种用于商务、通讯和娱乐领域的手持式电子设备越来越受到人们的青睐,对于广播系统行业,它能够为人们提供一个更方便快捷地观赏电视节目的途径。然而,相关部门也将面临着新的挑战,还有不少技术及市场的难题需要去解决。本文主要通过探究当前许多国际标准组如DVB—H、OMA等的移动电视讯号传输规格与相关设计情况。     

基于IPv6的移动终端的通信

目前由于IPv4地址空间的短缺,基于IPv4的移动终端的通信效率受到了影响,限制了新业务的开展,使对基于IPv6的移动终端问通信的研究显得更为重要.本文首先分析了IPv6对移动终端的支持和实现机制,然后研究了移动终端在IPv6环境下的通信实现,最后讨论了移动IPv6越区切换技术和安全性问题.     

数字蜂窝移动通信的发展

本文介绍数字蜂窝移动通信的发展趋势。随着移动通信业务的不断扩大,用户对通信的要求也越来越高。由于第一代模拟蜂窝移动通信系统已跟不上迅速增长的用户需求,发展第二代数字蜂窝移动通信系统已成为必然趋势。     

New generation Java smart cards

The mobile communications sector has long been one of the key driving forces behind the advances in smart card technology. As an industry area that demands innovation, this trend is set to continue. With large investment in both infrastructure and new licences, every mobile network operator strives to offer their customers a better service than that available from their competitor. With cost margins slashed, this can only be provided through an enhanced user experience based on strong applications that really meet consumers' demands for innovation and performance. In spite of the strong competition inspired by an industry aiming to maximise its Average Revenue Per User (ARPU), this has not stopped the networks cooperating on standards to ensure that the smart card industry delivers what they need in terms of interoperability and functionality. While maintaining interoperability the mobile network operators have an ever-increasing need for differentiation that translates into new services and applications that capture the user's imagination.     

移动通信中多普勒效应的研究及仿真

克服高速移动带来的多普勒效应是移动通信系统一个必须解决的问题。该文首先介绍了多普勒效应的原理,进而分析了多普勒效应在移动通信中对载频的的影响,最后运用MATLAB语言和Simulink模块实现了在声频范围内多普勒效应的仿真。     

移动通信中多普勒效应的研究及仿真

克服高速移动带来的多普勒效应是移动通信系统一个必须解决的问题。该文首先介绍了多普勒效应的原理，进而分析了多普勒效应在移动通信中对载频的的影响，最后运用MATLAB语言和simulink模块实现了在声频范围内多普勒效应的仿真。     

Communications Systems Driven by Software Agent Technology

The application of software agent technology to the management of communications' infrastructures is a challenging domain as it requires management on different time scales and has many interacting components. This paper looks at the potential benefits that may be gained from the application of agent technology to communications systems and surveys recent developments. Recent work using distributed network management by adopting co-operating and self-interested agent models of collaboration are described. The paper provides an introduction to the authors' perceptions of agent technology, followed by a discussion of some issues that need to be addressed for agent technology to be of practical use in the communications domain. Following sections describe how agent technology has been used for network management, legacy telecommunications systems, and telecommunications integration. The authors discuss how the emerging standards for agent technology can be used in an applied situation of providing a virtual private network and mobile agent technology used for fully distributed network control.     

应用于多层小区结构的移动IP方案

给出了一种新的移动IP移动性管理方案,包括分层的FA拓朴、灵活的切换控制策略和两种COA方式,与其他的微移动协议相比,该方案更适合多层小区结构的网络。     

一种确保移动Agent传输安全性的模型

在分析了移动Agent通信中存在的安全威胁之后,提出了一种保护移动Agent通信中数据传输安全性的模型。该模型是基于一些数据加密技术和身份认证技术,能较好地满足移动Agent数据传输中的安全需求。     

Efficient group key management for multi-privileged groups

Multi-privileged group communications containing multiple data streams have been studied in the traditional wired network environment and the Internet. With the rapid development of mobile and wireless networks and in particular mobile ad-hoc networks (MANETs), the traditional Internet has been integrated with mobile and wireless networks to form the mobile Internet. The multi-privileged group communications can be applied to the mobile Internet. Group users can subscribe to different data streams according to their interest and have multiple access privileges with the support of multi-privileged group communications. Security is relatively easy to be guaranteed in traditional groups where all group members have the same privilege. On the other hand, security has been a challenging issue and is very difficult to handle in multi-privileged groups. In this paper, we first introduce some existing rekeying schemes for secure multi-privileged group communications and analyze their advantages and disadvantages. Then, we propose an efficient group key management scheme called ID-based Hierarchical Key Graph Scheme (IDHKGS) for secure multi-privileged group communications. The proposed scheme employs a key graph, on which each node is assigned a unique ID according to access relations between nodes. When a user joins/leaves the group or changes its access privileges, other users in the group can deduce the new keys using one-way function by themselves according to the ID of joining/leaving/changing node on the graph, and thus the proposed scheme can greatly reduce the rekeying overhead.