5 GHz goes the distance for home networkng

Today, there are a number of basic networking technologies that can support data-centric home networking, including 802.11b, HomeRF, and Bluetooth. As with most new markets and technologies, what users want their home network to do is rapidly changing and evolving. Today's early-adopters want more from their home networks than just sharing PC peripherals; they want to be able to send their digital entertainment content (digital pictures, MP3 audio, and DV-based video) throughout their homes. As this "early-adopter market" rapidly changes into a mass market, today's home network must evolve to where it supports not only TCP/IP-based data, but also audio and video data that require QoS. This evolution will require changes in the architecture and implementation of wireless networks. Air5 is a solution for handling the demands of wireless home networking. Based on the lEEE802.11a PHY-layer specification, it includes enhancements for delivering range and throughput levels. Air5 also delivers triple-DES security and guaranteed QoS performance through its TDMA-based synchronous MAC. There are over 40 companies developing 5-GHz based networking technologies today, so this will be a highly competitive technology evolution.     

智能电网中无线传感器网络技术的应用研究

无线传感器网络具有的特点能够很好地解决智能电网建设中遇到的很多问题。通过对无线传感器网络这一无线通信中的热点领域,在无线传感器网络体系构架、大规模组网技术及网络管理、环境感知技术、数据采集技术以及信息处理技术方面进行了应用研究,以期能将该项技术应用于我国智能电网的建设发展中。     

230MHz无线组网技术在用电信息采集系统中的应用

21世纪初期,230MHz无线组网技术在用电信息采集系统国内建设初期得到普遍应用。其具有组网简单、传输稳定、可传输数据和音频等多种信号的优点,在城市地区尤其是江苏地区得到广泛的应用。随着通信技术的发展,利用公共运营商的无线公网进行用电信息采集的方式得到推广,但近年来用电信息采集用户不断增加,网络带宽费用和千万级用户采集数据传输给我们带来新的挑战,因此重新审视230MHz无线组网方式,应将公网运营商无线公网和230MHz组网相结合,在城市等用电信息采集设备安装较为密集的地区采用无线230MHz专网通信方式,在城乡结合部或农村采用公网运营商无线组网方式,兼顾效益与安全。     

基于SDN构建高性能、易扩展的电力通信网

目前电力通信网所采用的是以主机为核心的传统网络组建方式,该模式在运营中表现出的设备投资大、管理成本高、升级难度大等问题,使其越来越难以满足电力系统信息化发展与创新的需要。在分析电力通信网承载业务特点的基础上,结合当前互联网发展趋势提出了一种基于软件定义网络（SDN）的新型电力通信网络架构,该架构具备的高性能、高可靠性、易扩展等特性,同时还可以便捷、低成本地实现网络管理、扩展升级以及新业务研发与部署。     

5G通信测试技术挑战

第5代移动通信（5G）采用的大规模天线阵列、新型多址技术、全频谱接入、超密集组网、新型网络架构等关键技术给测试带来了巨大的挑战,为便于进一步的开展具体测试方案研究,本文从测试的角度提出了第5代移动通信测试技术体系结构,结合5G通信新的网络架构、新的空口要求,重点对5G通信的无线信道模拟与评估测试、Massive MIMO系统测试、新波形和多址方案测试、业务和系统级集中测试等测试技术的难点和挑战进行了论述。     

基于无线通信模式的照明节能监控系统研究

针对当今照明领域产品和技术存在的智能化程度不高且没有实现网络化管理的缺陷,本文进行了一种基于无线通信模式的照明节能监控系统研究,该系统是一种集实时监控和网络管理于一身的新测控方法.它将无线传感网与GPRS无线通信技术相结合,以高校或住宅小区的照明系统为监控对象,对其进行实时监控和网络化管理,大大地提高了设备的智能化、网络化程度.实验及仿真证明,按照本文方法能达到最大限度地节电、降耗的目的.     

应用于变电站自动化系统的无线传感器网络技术

通信技术是变电站自动化赖以实现的关键技术之一。文章根据变电站自动化系统的特点,提出一种基于分簇路由的2层架构变电站自动化系统无线传感器网络(wireless sensor network,WSN)组网方案,该方案在过程层采用WSN,在间隔层、变电站层采用以太网。文章对该方案具体实施中的传感器节点能量供给、数据融合与分簇路由算法、可靠性与安全技术、WSN接入以太网等关键技术给出了初步解决办法,最后阐述了WSN实际应用于变电站自动化系统需进一步研究的问题。文章提出的有线通信网络与无线通信网络相结合的2层架构组网模式是对变电站自动化系统通信网络的一种有益探索。     

32位高性能传感器网络硬件平台的设计与开发

灵活可扩展的高性能无线传感器网络硬件是支撑科学研究与工程实践必不可少的基础平台.以高性能低功耗的STM32微控制器和高灵敏度CC2520无线收发器为核心芯片,设计开发了基于Cortex内核的新一代32位传感器网络开源硬件平台OpenWSN节点,并提供了符合通用模块互联总线规范的外扩接口,以方便与各种传感器和外扩功能板连接.在开源OpenWSN软件的支持下可快速构建传感网研究与应用平台.该设计遵循低功耗、高扩展、高可靠、低成本和微型化原则,实测表明具有良好的传输性能和低功耗特性,为进一步开展同步振动测量等高性能传感网应用奠定了良好基础.     

能源互联网背景下5G网络面临的挑战

能源互联网需要将能量流和信息流进行耦合,建立全新的能源体系,分析现有的能源互联网架构及对信息通信技术的需求,结合目前5G网络的研究现状和发展趋势,阐述5G网络在能源互联网背景下面临的大规模传感器接入和组网技术、分布式能源管理、面向能源互联网的应用架构以及网络体验质量(quality of experience,Qo E)和信息安全4个方面的挑战。能源互联网是一次重大的能源变革,信息通信技术是实现能源互联网的关键技术之一,综述能源互联网背景下5G网络面临的挑战,为未来能源互联网中信息通信技术的应用指明方向。     

无线传感器网络中的远程虚拟测试

介绍了无线传感器网络节点特征、拓扑结构和传输存储机制以及远程虚拟测试技术的基本原理和方法,探讨了远程虚拟测试技术在无线传感器网络中应用的可行性和相关关键技术问题,探索了无线传感器网络的测量技术,扩展了远程虚拟测试技术的应用领域,并介绍了相关仿真实验。     

基于无线传感器网络的电力设施冰灾实时监测与预警系统

一套完整可靠的电力设施冰灾监测预警系统,可以为各项防灾、减灾、救灾措施提供可靠的依据。现有电力设施冰灾监测预警系统未能发挥预先目标的原因在于通信网络的不可靠。提出了将无线传感器网络应用于电力设施冰灾监测预警系统的新概念,基于对系统监测内容与目标的分析,选择了系统所需的各类传感器节点,在考虑覆盖性与节约成本的前提下,进行了各节点的部署,针对输电走廊的特点,设计了一种二层架构的网络拓扑结构。鉴于实用要求,提出了利用小CT取能装置与蓄电池相结合的节点供能方法、基于查询的路由协议以及相应的数据融合技术。最后指明可靠性技术、安全性技术以及如何与现有电力通信网络互联是下一步研究的方向。     

无线传感器网络路由技术研究与应用

无线传感器网络综合传感器、嵌入式计算、现代网络、无线通信、分布式信息处理等技术,可以在长期无人值守的状态下工作,在许多领域有极其广泛的研究和应用价值.文章对无线传感器网络路由技术进行了研究,提出基于聚类的网络结构以及SCESR路由算法,并将其应用于电力系统监控.     

Powering sensor networks

This paper describes the sensor networks that are wireless systems in which large number of sensors can be deployed. A snapshot of the first-generation hardware and software for sensor networks, the requirements of the sensor nodes by their capabilities, and an outlook on future implementations are focused. These networks have been enabled in part by advancements in silicon sensor technology, low-power microcontrollers, chip-based radios, ad-hoc networking protocols, and operating systems and languages for embedded systems.     

ZigBee无线通讯技术在AMR系统中的应用

作为一种新兴无线传感器网络新技术,ZigBee主要用于近距离无线连接,面向无线传感和工业控制应用领域。在对ZigBee无线通讯技术的的特点进行总结的基础上,探讨了ZigBee技术在电力AMR系统中的应用可能,并分析了其应用的作用和优点,提出了ZigBee无线通讯技术作为AMR系统技术手段的应用方案。     

基于TDMA的宽带无线应急通信系统实现

文章介绍一种基于TDMA的专网宽带无线应急通信系统的实现方法.首先对专网和公网无线应急通信系统特点进行比较,指出了基于TDMA的宽带无线应急通信系统的优点;然后从组网结构和无线接口方面描述了基于TDMA组网的宽带无线应急系统的框架;最后从网络接入方式、帧同步技术、调制编码技术、QoS保障技术、抗干扰技术方面提出了基于T...     

Medical-Grade, Mission-Critical Wireless Networks [Designing an Enterprise Mobility Solution in the Healthcare Environment]

Today's healthcare environment requires an enterprise mobility solution for both patients and staff. Separate isolated networks are suboptimal from cost, management, scalability, and reliability perspectives. The wireless medical telemetry system (WMTS) does not provide sufficient bandwidth for many hospitals. Therefore, some seek to operate outside of the WMTS. Standards-based 802.11 networks with published reliability tenfold higher than conventional telemetry already meet the requirements for supporting life-critical applications. These 802.11 networks are easily supported on an enterprise scale, and they have advanced and matured to meet the needs for life-critical applications on an enterprise-wide shared network. To achieve peak performance, any network must be properly designed, installed, and validated for its intended use. To maintain peak performance, the network must be actively monitored and managed.     

基于信息融合技术的电力综合监控系统设计

针对电力监控系统存在功能单一、集成度低、互操作性不强、实时性差等问题,采用多元信息融合技术,提出一种基于嵌入式平台和无线通信技术的设计方案。文章给出了系统硬件和软件的实现方法,系统在监测区域部署ZigBee无线传感器网络,将监测数据汇集到嵌入式网关,实现统一的数据管理和用户远程访问,构建了监控管理信息平台,从而完成电网海量实时监测数据的采集、传输、存储和处理。系统能满足高集成度的电力监控应用需求,具有扩展性好、功耗小、成本低、实时在线等优点。     

中压电力线载波IP组网技术研究

10 kV电力线载波通信技术是配用电通信的重要组成部分,为满足配用电通信网络化发展需求,适用网络远动规约,需改变现有的轮询机制,采用载波网络IP组网的方式。文中从电力线载波IP组网应用及技术角度,分析载波IP组网实现难点,提出网络接口高速载波通信技术、信道时分复用及网络逻辑端口映射技术等IP组网技术,并提出多载波网络并发通信组网及单载波网络多通道并行工作组网等IP组网应用方案。适用于中压载波网络小规模IP组网应用。     

Energy Efficient Medium Access Protocol for Wireless Medical Body Area Sensor Networks

This paper presents a novel energy-efficient MAC Protocol designed specifically for wireless body area sensor networks (WBASN) focused towards pervasive healthcare applications. Wireless body area networks consist of wireless sensor nodes attached to the human body to monitor vital signs such as body temperature, activity or heart-rate. The network adopts a master-slave architecture, where the body-worn slave node periodically sends sensor readings to a central master node. Unlike traditional peer-to-peer wireless sensor networks, the nodes in this biomedical WBASN are not deployed in an ad hoc fashion. Joining a network is centrally managed and all communications are single-hop. To reduce energy consumption, all the sensor nodes are in standby or sleep mode until the centrally assigned time slot. Once a node has joined a network, there is no possibility of collision within a cluster as all communication is initiated by the central node and is addressed uniquely to a slave node. To avoid collisions with nearby transmitters, a clear channel assessment algorithm based on standard listen-before-transmit (LBT) is used. To handle time slot overlaps, the novel concept of a wakeup fallback time is introduced. Using single-hop communication and centrally controlled sleep/wakeup times leads to significant energy reductions for this application compared to more “flexible” network MAC protocols such as 802.11 or Zigbee. As duty cycle is reduced, the overall power consumption approaches the standby power. The protocol is implemented in hardware as part of the Sensium™ system-on-chip WBASN ASIC, in a 0.13- $mu{hbox {m}}$ CMOS process.      

A distributed information repository for autonomic context-aware MANETs

Due to the emergence of multimedia context-rich applications and services over wireless networks, networking protocols and services are becoming more and more integrated, thus relying on context and application information to support their operation. Further, wireless protocols and services now employ information from several network layers and the environment, breaking the layering paradigm. In order to cope with this increasing reliance on information, we have proposed MANIP, a middleware for MANETs that instantiates a new networking plane. The Information Plane (InP) is a distributed entity to store and disseminate information concerning the network, its services and the environment, orchestrating the collaboration among cross-layer protocols, autonomic management solutions and context-aware services. We use MANIP to support the autonomic reconfiguration of a P2P network over MANETs. Simulation results show that the MANIP-enabled solutions reduce the response time and increase the number of solved P2P queries when compared to classic, cross-layer implementations of the same protocols.