IP化基站无线Mesh组网构架

无线网状网（WMN）融合了无线局域网（WLAN）和Ad Hoc网络的性能优势,具有容量大、速率高、覆盖范围广等特点,成为宽带无线接入的一种有效手段,可以灵活地应用于多种无线环境。目前,蜂窝移动通信系统中各基站间的有线连接,使得传统的蜂窝移动通信系统难以满足部署方便、成本低廉、高可扩展性、高可靠性等指标。为适应下一代移动通信网络扁平化、简单化的发展趋势,IP化基站的无线Mesh组网架构是可选方案之一。支持IP化基站自组织的关键技术包括按需的基站自组织技术、联合无线资源调度机制、路由技术、安全技术、网络管理技术等。     

校园网中的无线组网方案

文中首先介绍现存的无线网络技术，计论适用佼园网环境的无线组网方法。然后给出校园内局域网间、校园网间及校园网与ＣＥＲＮＥＴ地区网络中心之间的无线互连实例。最后介绍移动计算网络的概念，指出今后校园网中移动计算网络的实现方法。     

移动通信局外基站的设计

从站址选择、机房改造、传输方式、电源系统、防雷接地等几个方面,简要介绍了在移动通信局外基站的设计中应注意的问题。     

无线基站选址原则与实践

本文主要介绍了在无线基站选址过程中的总体原则以及实践经验分析.     

无线通信系统中的软基站技术

无线通信系统经过多年的发展,各制式出现融合的趋势。同时运营商降低采购和运营成本的需求,使得支持多种制式、平滑演进的＂软基站＂成为无线基站演进的方向。文章对无线通信系统软基站的相关技术背景进行了介绍,并对实际软基站的架构设计思想、系统模块构成及关键技术等进行了提纲挈领地分析。文章指出未来软基站将继续向集成度更高、基带资源调配更灵活、传输方式更丰富、成本更低、节能更环保几个方向发展。     

Soft Base Station Technology in Wireless Communication Systems

With the rapid development of wireless communications systems, different system standards are being merged. Operators take stringent measures to reduce Operational Expenditure (OPEX) and Capital Expenditure (CAPEX); and as a result,soft base stations supporting multiple standards become the evolutionary tend of wireless base stations. This paper introduces the background of soft base stations and analyzes their architecture design, system modules. The key technologies in system implementation and future directions are also presented.     

面向多传感器模块接入的低功耗无线传感器节点

设计了一种面向多传感器模块接入的低功耗无线传感器节点。该节点基于超低功耗Zigbee单片机MC13224V设计,由射频模块、配置电路和电源系统等组成。根据无线通信系统的特点设计了系统的软硬件,详细阐述了硬件设计、软件设计及性能测试方法。测试结果证明：在3V电源供电条件下,休眠时电流小于11μA,实现了低功耗设计的目的。     

无线基站的选址方法研究

从分析无线基站选址和部署原则着手,阐述了基站选址应该考虑的问题和着重点,研究了无线基站选址方法,并在原有拓扑结构基础之上提出了新的覆盖模型,给出了覆盖半径调整后目标区域的覆盖率计算公式。该模型克服了过去简单地把基站区域等效为正六边形的固有观念,为新建网络的站点规划提出了新思路。     

移动通信基站中继接入中的几种无线接入方式

结合数字微波、固定无线接入（Ｍ Ｍ Ｄ Ｓ、ＬＭ Ｄ Ｓ）、自由空间光通信（ＦＳＯ ）等技术的特点以及移动通信网络的建设发展，对移动通信基站中继接入中采用无线接入手段的应用情况做了总结。     

Internet Connectivity for Ad Hoc Mobile Networks

The growing deployment rate of wireless LANs indicates that wireless networking is rapidly becoming a prevalent form of communication. As users become more accustomed to the use of mobile devices, they increasingly want the additional benefit of roaming. The Mobile IP protocol has been developed as a solution for allowing users to roam outside of their home networks while still retaining network connectivity. The problem with this solution, however, is that the deployment of foreign agents is expensive because their coverage areas are limited due to fading and interference. To reduce the number of foreign agents needed while still maintaining the same coverage, ad hoc network functionality can cooperate with Mobile IP such that multihop routes between mobile nodes and foreign agents can be utilized. In this work, we present a method for enabling the cooperation of Mobile IP and the Ad hoc On-Demand Distance Vector (AODV) routing protocol, such that mobile nodes that are not within direct transmission range of a foreign agent can still obtain Internet connectivity. In addition, we describe how duplicate address detection can be used in these networks to obtain a unique co-located care-of address when a foreign agent is not available.     

移动基站通信动力环境监控系统的改造

介绍了移动基站动力环境监控系统的改造，通过简化独立监控模式、干接点告警系统的升级改造和各项技术性能的完善，形成了一个实用、稳定、经济的系统。     

动态测量方法在基站能效评估中的应用

传统基站能效评估多采用基站的静态功率作为主要衡量依据。静态测试方法只关注设备在固定配置下的硬件能耗,但忽略了节能技术、节能算法对设备、网络能耗的影响。目前国外的一些标准化组织和我国的通信标准化协会在其通信产品节能标准项目中已展开对动态评估方法的研究,尝试建立基于动态模型的、更贴近设备实际性能的能效评估方法。     

无线移动传感器网络自适应体系结构的设计

随着无线网络技术的日益成熟及其对小型、微型移动设备的支持，无线移动传感器网络已经逐渐成为一个研究的热点。主要讨论了为无线移动传感器网络设计的一个自适应的体系结构。在该体系结构中，使用了一个区域和核心路由节点相结合的多层结构的方法来增加无线移动网络的信息传输能力、可扩充性和可靠性，并降低网络的能耗，这样就可以适应无线移动网络的高度动态性和移动性。     

小型化低功耗多媒体传感器网络节点设计

针对无线多媒体传感器网络及其性能特点,特别是在军事上的重要应用,以及当前无线多媒体传感器网络在能量、通信、计算和存储能力等方面还有待进一步完善,其节点芯片设计、三维场景的覆盖、智能多媒体信息处理和多媒体信息安全等还存在的问题,根据实验需要,设计并实现了小型化低功耗无线多媒体传感器网络节点的硬件平台,测试结果表明该设计满足指标要求。     

无线用户环路技术及其应用

本文在分析无线用户环路的特点和关键技术的基础上,介绍了它的实现方法、系统结构及其应用,并就有关技术方案和标准的选用提出了作者自己的看法。     

无线传感器网络硬件平台的研究与设计

无线传感器网络因其巨大的应用前景而受到学术界和工业界越来越广泛的重视。简要介绍了无线传感器网络的体系结构,着重从硬件平台设计的原则出发,对硬件平台进行了研究和分析,最后提出对硬件平台设计的构想。     

无线体域网中的传感器节点设计与实现

本文基于双光束投射原理,搭建了用于监测脉搏、血氧和环境信息的WBAN无线传感器节点硬件平台,编写了嵌入式系统软件.经测试,该节点工作稳定、可靠,且具有微型、低功耗等特点,对WBAN无线传感器节点设计具有一定的指导作用.     

Decoupled Active/Passive Base Stations for Second Generation Cellular Networks

The effect of electromagnetic radiations from wireless cellular telephony systems on human health has been intensely discussed. As a result, and despite the lack of evidence on any adverse effects, recent regulations make network planning even more difficult. Base stations, even those covering urban areas, tend to be placed at suburban locations (in this paper we cite some examples of related local regulations). In these cases, mobile stations inside urban locations must raise their power transmission level to reach suburban antenna placements. Therefore, users may complain of a higher radio exposure. In this work we propose a feasible solution to reduce electromagnetic activity from mobile communications equipment and to cope with restrictive placement regulations. To accomplish this goal, a suburban base station is divided into an active part (transmitter) that is kept at the suburban location, and a passive part (receiver), which is moved inside the urban area. Thereby, the power received from the base station can be considered negligible inside the urban area (since the active part is far away), and mobile terminal/stations transmit lower power levels (since passive receivers are close to them). We justify the solution in the context of the globally available GSM networks, both analytically and with empirical and simulation tests. The results in this paper reveal that our approach reduces electromagnetic levels and improves uplink quality, which reaches typical levels of urban base stations.