AOP event manager in open service gateway〖WT5\"HZ〗Abstract:〖WT5\"BZ〗〖WT5”HZ〗Key words:〖WT5”BZ〗

The Open Service Gateway Initiative (OSGi) has played an important role in ubiquitous environments that support interoperability among embedded devices, such as home appliances and network devices. However, the OSGi does not have a common event mechanism yet, and it is difficult to communicate among services asynchronously. In the present work, a common event manager, AspectOriented Event Manager (AOEM), was designed on an OSGi framework. AOEM supports services to generate and provide notification of events. This paper presents the implementation of AOEM as an OSGi bundle with AspectJ. The experiment on transferring between device service and application service demonstrate that AOEM provides good abstraction of the services and convenience.     

A novel architecture for ubiquitous location based services in TD-SCDMA

Advances in mobile devices, sensors and wireless networks have motivated the development of location based services(LBS) applications. However, most of the positioning methods specifically designed for either indoor or outdoor and their accuracy and precision differs greatly, so it’s difficult using only one positioning method to meet all people’s demands. This paper proposes a new architecture for ubiquitous location based services in TD-SCDMA. In this architecture the proper positioning methods are determined by the uses’ surroundings and the demands of accuracy and precision, and the problem that the user’s environments change has been also resolved commendably. And this architecture solves the problem that environment changes while positioning. The simulation shows that everyone can use the location based services anywhere and anytime with the mobile terminal through this architecture.     

A novel architecture for cargos location and safety in networked RFID

Using Networked RFID equipped in warehouse or supermarket distribution, Enterprise information system (EIS) can gather and deal with cargos information. Nevertheless, when cargos are in traffic, the Networked RFID can't monitor the cargos any more as the products tagged aren't within range of a reader. This paper proposes a solution framework which combines Networked RFID and GPS tracking, and then equip with this system in container to make the cargos monitored even if the cargos are in traffic. This solution can solve the accurate consignments, position tracking and advanced theft happening through drilling holes in container. In addition, customhouse and checkpoint can get an electronic shipment manifest rapidly and safely when a vehicle gets through a checkpoint.     

A novel architecture for ubiquitous location based services in TD-SCDMA

Advances in mobile devices, sensors and wireless networks have motivated the development of location based services(LBS) applications. However, most of the positioning methods specifically designed for either indoor or outdoor and their accuracy and precision differs greatly, so it's difficult using only one positioning method to meet all people's demands. This paper proposes a new architecture for ubiquitous location based services in TD-SCDMA. In this architecture the proper positioning methods are determined by the uses' surroundings and the demands of accuracy and precision, and the problem that the user's environments change has been also resolved commendably. And this architecture solves the problem that environment changes while positioning. The simulation shows that everyone can use the location based services anywhere and anytime with the mobile terminal through this architecture.     

在高速铁路场景下的TD-SCDMA覆盖方案

对高铁场景下TD覆盖的主要问题进行分析,结合高铁技术方案提出高铁TD组网方案建议.     

TD-SCDMA系统小区内干扰分析

为了研究并分析第三代移动通信TD-SCDMA系统小区内的干扰,奠定TD-SCDMA系统的容量、覆盖等基本性能指标的重要理论基础,在给出单载波小区干扰模型条件下,通过对单载波TD-SCDMA系统小区内符号间的干扰和多址干扰进行定性地研究与分析,给出了干扰的分析和计算方法,分析了智能天线和联合检测技术对TD-SCDMA系统干扰的影响,并通过实际组网条件下TD-SCDMA系统内的干扰进行了计算机仿真结果和分析,验证了对TD-SCDMA系统中对小区内干扰的研究与分析结论,从而得到了影响系统的容量、覆盖等基本性能指标重要的理论依据.     

基于TD-SCDMA制式的3G协议分析仪的设计

TD-SCDMA是我国自主创新、具有自主知识产权的全球第三代通信系统(简称3G)技术标准,它得到了中国政府的全面支持,成为我国的主流标准和主流制式.该项目针对该标准研发了3G TD-SCDMA协议分析仪项目,能有效支持中国3G的建设.     

TD-SCDMA的关键技术及优势

介绍了TD—SCDMA的技术特点和优势,指出TD—SCDMA是具有自主知识产权的第三代移动通信（3G）国际标准。     

3G网络教育服务器负载均衡技术的研究与探讨

3G移动通信技术的发展与应用为网络远程教育提供了新的应用方向,以手持终端为求学手段的剧增将势必给基于3G网络教育站点中的服务器带采巨大的挑战．本文通过对不同服务器负栽均衡技术的研究与比较,结合TD-SCDMA中3G移动通信系统的网络特性,采用多重粒度负载均衡等技术,以最大限度地保证服务器的正常运转．     

TD-SCDMA 2G与3G覆盖系统共建过渡问题

本文对如何合理利用原有的2G室内覆盖系统升级到3G覆盖系统,在共建时的一些原则。还探讨了室内分布共用分布系统的建设方案。在进行无线网络建设时,对室内外信号泄漏及协调作了分析,以及在多网合一的室内分布系统的设计中,对系统间干扰的分析和抑制的设计参数。     

一种基于预注册和预授权无缝切换的TD-SCDMA与WLAN融合的体系结构

伴随TD-SCDMA的独立组网,把TD-SCDMA的优势与高速低成本的WLAN技术相结合的组网方式已经成为当前研究的热点.简要分析了TD-SCDMA和WLAN网络,给出了一种TD-SCDMA和WLAN网络融合的体系结构,对事例体系结构下的切换过程进行了详细描述,并采用预注册和预授权的无缝切换方式来优化切换性能.TD-SCDMA和WLAN网络的融合在功能上实现了对这2种网络的扩展,并使得2种网络的优势更加突出.     

高速环境下多小区联合信道估计算法

在已经投入运行的高铁列车环境下,存在着频繁的小区切换和小区接入过程,而这两个过程都产生强的相邻小区干扰.在接收端进行信号检测时,单个小区联合检测必须扩展到多个小区联合检测,相应的信道估计算法也必须扩展到多小区.传统信道估计算法对本小区和相邻小区进行信道估计时,其他小区的用户信号均被视为噪声,增加了噪声的总功率,低了信道估计精度,最终降低了多个小区联合检测算法的性能.本文提出的信道估计算法把相邻小区的强干扰用户纳入信道估计矩阵来降低噪声,达到提高信道估计精度的目的.仿真表明,该算法同时提高了本小区用户信道估计精度和邻小区强干扰用户信道估计精度.