3G终端场地测试

本文从终端场地测试的详细分析为出发点,阐述了3G终端场地测试的重要意义.文章又从准入条件、测试内容、测试工具以及分析处理等方面,为今后3G终端场地测试的开展提出了合理化的建议.特别是本文对于测试内容进行的类别划分,对于今后终端场地测试开展的思路拓展,将起到积极的作用.     

基于3G网络移动设备位置服务的应用

为了使3G网络架构的性能为移动设备定位提供更好的服务，现介绍一种在J2ME开发平台下，运用Mobile SVG规范开发的，移动GIS中定位技术的应用。分析了Mobile SVG在开发移动GIS中的优势，并且提出如何运用J2ME和SVG Tiny技术来构造3G手机位置服务的终端应用平台。     

Determination of the Registration Point for Location Update by Dynamic Programming in PCS

Location management is important to effectively keep track of mobile terminals with reduced signal flows and database queries. Even though dynamic location management strategies are known to show good performance, we in this paper consider the static location management strategy which is easy to implement. A system with single home location register and pointer forwarding is assumed. A mobile terminal is assumed to have memory to store the IDs of visitor location registers (VLRs) each of which has the forwarding pointer to identify its current location. To obtain the registration point which minimizes the database access and signaling cost from the current time to the time of power-off probabilistic dynamic programming formulation is presented. A Selective Pointer Forwarding scheme is proposed which is based on one-step dynamic programming. The proposed location update scheme determines the least cost temporary VLR which point forwards the latest location of the mobile. The computational results show that the proposed scheme outperforms IS-41, pure Pointer Forwarding, and One-step Pointer Forwarding at the expense of small storage and a few computations at the mobile terminals.     

基于蚁群算法的电力基建工程物联网全数据管理

针对现有技术中电力基建工程全生命周期数据管理技术落后,计算效率低下的问题,提出了新型的智能化管理系统,该管理系统融合了大数据、云计算、物联网、移动互联等新型技术,通过使用包括计算机网络系统、Web端主站平台、手持终端APP、移动终端采集系统及专用支撑网络的数据管理平台,实现了电力基建工程设备全生命周期管理信息从数据采集、数据传递、数据计算到应用的全生命周期管理,提高了电网设备的自动化、智能高效管理。通过利用数据融合算法和蚁群最优搜索算法,实现目标数据的最优搜索。试验表明,该研究方法准确率高达93%。     

移动云下的终端集中安全管理系统研究

目前移动终端作为行业终端,承载行业应用,在日常办公中的地位日益重要,但移动终端尚未纳入到企事业单位的信息安全系统中,风险较大。文中分析了移动终端面临的风险,包括恶意软件风险、网络传输风险、身份识别风险和设备丢失风险,提出了移动终端集中化安全管理系统的架构以及针对风险的解决方案。在集中化安全管理系统中,移动终端数字证书的分发是一个重要的问题。文中最后分析了两种移动终端数字证书的分发方法并比较了其优劣。     

5G mobile terminals with advanced QoS-based user-centric aggregation (AQUA) for heterogeneous wireless and mobile networks

In this paper we present an advanced QoS provisioning module with vertical multi-homing framework for future fifth generation (5G) mobile terminals with radio network aggregation capability and traffic load sharing in heterogeneous mobile and wireless environments. The proposed 5G mobile terminal framework is leading to high performance utility networks with high QoS provisioning for any given multimedia service, higher bandwidth utilization and multi-RAT capabilities. It is using vertical multi-homing and virtual QoS routing algorithms within the mobile terminal, that is able to handle simultaneously multiple radio network connections via multiple wireless and mobile network interfaces. Our 5G proposal is user-centric, targeted to always-on connectivity, maximal network utilization, maximal throughput, seamless handovers and performances improvement by using vertical multi-homing, as well as session continuity. The performance of our proposed mobile terminal framework for 5G is evaluated using simulations and analysis with multimedia traffic in heterogeneous mobile and wireless scenarios with coexistence of multiple radio access technologies, such as 3G, 4G as well as future 5G radio access networks.     

GSM手机到WCDMA终端的演变

第三代移动通信将使人类进入一个崭新的移动信息社会。而第三代移动终端是人们讲人这一多姿多彩社会的桥梁。本文通过介绍WCDMA移动终端的软硬件结构,向人们展示了未来第三代终端的轮廓。     

基于GPS的3G移动学习系统

3G移动教育已成为远程教育发展的必然趋势,但国内缺乏实用的3G移动教育系统。因此,结合3G移动通信技术、GPS定位技术和移动教育的特点,构建了一套基于GPS的3G移动学习系统（MLS3G）模型。解决3G智能终端、GPS/GPRS收发模块、3G网关模块、GIS模块等关键技术问题后,在3G智能终端和MLS3G服务器平台上通过测试验证。研究表明,MLS3G模型具有较好的交互性、实时性和通用性。     

一种高效移动警务终端安全管控平台

安全问题历来是移动警务技术的核心和瓶颈,束缚着移动警务技术的发展。分析了当前移动警务终端面临的主要安全隐患,在有针对性地制定相应对策的基础上,提出了一种高效移动警务终端安全管控平台的解决方案,具体闸述了此平台的实现原理、架构设计、性能优势。对目前移动警务终端安全保障机制的研究,具有一定的借鉴意义。     

移动终端测试与质量评估体系的研究

对运营商如何建立一套客观、公平、完备的终端测试与质量评估体系进行了研究,介绍了相关标准组织对移动终端测试的要求,然后详细分析了国内外运营商终端测试内容和评价策略的现状及其局限性,最后就运营商终端测试的测试标准、测试内容和评价策略三方面提出了建设性意见.     

移动金融终端安全研究

随着商业模式的日渐清晰以及3G/4G网络的大面积普及,移动金融市场将在未来几年继续呈现爆发式的增长。然而,智能手机的开放性使得移动端的安全问题日益严重。众多新兴的金融支付类病毒利用系统漏洞,配合页面劫持、进程注入、短信劫持等攻击手段,对移动用户的金融账户、口令、验证码等信息进行盗取。终端安全性问题已经严重阻碍了移动金融市场的健康发展。针对上述问题,文中从终端硬件、系统框架、应用程序、NFC等多个技术层面展开,对当前移动互联网金融中的终端安全威胁进行详细梳理,并给出切实可行的解决方案。     

An adaptive resource management for mobile terminals on vertical handoff

Mobile communications and wireless networks are developing at a fast pace. The increasing number of mobile subscribers and terminals are the real life evidence of the fast growing development in the area of wireless communication. Wireless communication technology is now pursuing 4G (fourth generation) and seeking a scheme to provide quality of service (QoS) to the various applications continuously even moving to another network. In this paper, we proposed a dynamic resource management architecture which considers vertical handoff situation with minimal disruption of service to the users considering seamless provision of QoS. The proposed scheme efficiently manages resources and provides stable services to the mobile terminal. The simulation results show that resource management enabled mobile terminals utilize system resources, CPU and memory, efficiently improved by 40% and 65%, respectively, rather than mobile terminals without resource tuning.     

浅析3G移动终端CCC认证

国家认监委要求自2010年1月0日起,3G移动终端设备必须获得CCC认证,文章概述了中国的认证认可体系及强制性产品认证制度,介绍了3G移动终端设备相关的强制性检测认证标准和过程;并且论述了在应对国际金融危机大背景下,认证认可是促进电子通信行业提高质量、又好又快发展的重要保障,是提升国际竞争力的重要手段。提出3G终端的CCC认证应该进一步加强。     

未来移动通信系统中的无线资源管理

文章结合当前正在研究的后3代(B3G)、第4代(4G)移动通信系统的发展和处于运营及推广阶段的第3代移动通信系统,分析了未来移动通信系统中无线资源管理系统的关键技术,探讨了多体制标准下的无线通信网络和多种业务情况下的无线资源管理的研究方向。     

Receiver memory management method for HARQ in LTE‐based satellite communication system

For the successful deployment of the long term evolution (LTE)‐based mobile satellite service, the price of a user terminal is one of the major factors. A user terminal for the LTE‐based satellite communication needs to be implemented with a similar hardware size that is used for a terrestrial LTE user terminal. However, for quality of service provision, the satellite user terminal needs a larger size of memories than the terrestrial terminal does. This is very evident by considering that the N‐channel stop and wait hybrid automatic repeat request requires proportionally increasing memory size by the propagation delay, resulting in unmanageable amount of memories in the satellite system. To resolve this problem, we propose an efficient memory management method at the user terminal when the size of memory is insufficient. The simulation results in this paper reveal that the proposed method can increase the throughput about 20.7% when a user terminal is operated under very low throughput condition with an insufficient memory size, compared with the case without memory management scheme. In addition, we show that the additional throughput gain can be obtained by the packet scheduling using the information of receiver memory status. Copyright © 2015 John Wiley & Sons, Ltd.     

一种用于5G 移动通信终端的双频MIMO天线系统

为满足5G 移动通信系统对信道容量的要求,提出了一种应用于5G 移动终端的双频多输入多输出(MIMO)天线系统。它由沿移动终端两个长边垂直放置的八个天线单元组成。该天线系统可以覆盖中国工业和信息化部(MIIT)所规划的3.3 ~ 3.6 GHz 和4.8 ~ 5 GHz 两个频段,且低频段和高频段的天线效率分别高于61% 和50%。通过优化各天线的相对位置和放置方向,使得各端口之间的隔离度优于15 dB。为更好评估天线系统性能,计算了MIMO天线的包络相关系数(ECC)和信道容量(CC)。所得该MIMO 天线系统在工作频段内ECC均小于0.1,且信道容量峰值可以达到36.8 bps/ Hz。同时,制作并测量了MIMO 天线样品,测试结果与仿真结果表现出良好的一致性。     

浅析3G增值业务综合网管的规划与设计

围绕用户体验分析了3G增值业务综合网管系统的规划和设计,对3G增值业务综合网管的若干特征、架构设计、指标建模方法及建设模式进行了探讨,这对3G增值业务综合网管系统的建设具有一定的指导意义。     

小区分层依概率寻呼的位置管理策略

位置管理是移动通信领域的一个具有挑战性的问题,涉及到位置更新和位置查找操作.我国及其他国家目前正在使用的个人通信网络中,基本的位置管理策略(简称"基本策略")的位置查找操作采用的是,在整个位置区中同步寻呼移动台.由于所要寻找的移动台只在由众多小区所组成的位置区内的一个小区中,因此,"基本策略"会造成系统资源的极大浪费.本文给出一种对位置区内的小区进行分层,按移动台在各层小区的概率从大到小的次序,逐层进行寻呼的位置管理策略(简称"分层策略").在假定移动台在各个小区的逗留时间是符合一般概率分布的随机变量的条件下,推导出移动台处于各层小区的概率及"分层策略"所需搜索的小区平均个数公式.证明了"分层策略"的位置管理费用不大于"基本策略".     

A Location Management Scheme Using Direction Characteristics of Mobile Terminals in Mobile Communication Networks

Recently, as the number of mobile terminals (or users) keeps explosively increasing, the location management to track the mobile terminals in mobile communication networks is becoming more important. However, previous schemes have used static location information without any consideration about the moving direction of a mobile terminal. For a fixed paging area, this results in unnecessary pagings, thus increasing the location management cost. In this paper, we propose a new location management scheme using the direction characteristics of a mobile terminal. The direction vector is defined to represent the moving direction of a mobile terminal and to compute a distance from the cell where a location update occurs to the current cell. The offset operation of direction vectors is also presented to represent the position of a mobile terminal in a paging area. This allows the mobile terminal to determine whether a location update will be performed or not. The mobile terminal can also vary its own paging area dynamically according to its moving direction whenever it moves across its paging area. In addition, we develop an analytical model for the proposed scheme which captures the direction characteristics of a mobile terminal based on the Markov model. Analytical results show that the proposed scheme can reduce location management cost by forming a dynamic paging area along the moving direction of a mobile terminal when compared to other schemes.Ui-Sung Song received his B.S and M.S. degrees in Computer Science and Engineering from Korea University, Seoul, Korea in 1997 and 1999, respectively. He is currently a Ph.D. candidate in Computer Science and Engineering from Korea University. Also, he is currently a researcher in the Research Institute of Computer Science and Engineering Technology at Korea University. His research interests include mobile IP, PCS networks, and ad-hoc networks.Joon-Min Gil received his B.S. and M.S. degrees in Computer Science from Korea University, Chochiwon, Korea in 1994 and 1996, respectively. He received his Ph.D. degree in Computer Science and Engineering from Korea University, Seoul, Korea in 2000. From 2001 to 2002, he was a visiting research associate in the Department of Computer Science at the University of Illinois at Chicago, U.S.A. He is currently a senior research engineer in Supercomputing Center at Korea Institute of Science & Technology Information, Daejeon, Korea. His recent research interests include distributed and mobile computing, wireless networks, Internet computing, P2P networks, and grid computing.Chong-Sun Hwang received his M.S. degree in Mathematics from Korea University, Seoul, Korea in 1970, and his Ph.D. degree in Statistics and Computer Science from the University of Georgia in 1978. From 1978 to 1980, he was an assistant professor at South Carolina Lander State University. He is currently a full professor in the Department of Computer Science and Engineering at Korea University, Seoul, Korea. Since 2004, he has been a Dean in the College of Information and Communications at Korea University. His research interests include distributed systems,distributed algorithm, and mobile computing systems