基于IEEE802．15．4的无线传感器网络节点的设计

无线传感器网络节点硬件结构的核心是微处理器,而微处理器的选择又必须和通信协议兼容.该设计采用目前广泛应用于无线传感器的IEEE 802.15.4通信协议,并选择与此兼容的JN5121微处理器(JN5121微处理器具有低功耗、低成本等特点).介绍了基于JN5121无线传感器网络的硬件组成,包括微处理器的结构、性能特点、外围电路及硬件平台的结构设计.同时阐述了JN5121的软件开发环境、射频部分的组成、连接和控制以及实物产品的开发.     

基于IEEE802．15．4的ZigBee无线网络数据传输安全的研究与探讨

ZigBee作为一种新型的近距离无线网络技术,在无线个域网领域获得了越来越广泛的应用。本文以ZigBee的网络协议栈结构为依托,着力介绍了ZigBee提供的数据传输安全服务、安全套件以及应用接口,对基于IEEE802．15.4的ZigBee无线网络数据传输安全问题进行了探讨,并对ZigBee无线网络安全机制的发展进行展望。     

基于IEEE802.15.4无线传感器网络的IPv6协议栈

基于IPv6overIEEE802.15.4的无线传感器网络是目前研究的一个热点。其中,设计适合传感器节点的嵌入式IPv6协议栈是一个关键。本文在分析了IEEE802.15.4和无线传感器网络的特点后,针对这些特点提出一种嵌入式IPv6协议栈的设计方案;并在本文的最后,总结了设计时要考虑的关键因素。     

IEEE802.15.4/ZigBee协议的MAC层节点能耗分析与研究

能耗是无线传感网络性能的重要参数之一,针对无线传感网络WSNs特点,对无线传感网络的ZigBee技术标准傲了分析研究.围绕网络低功耗运行,从MAC层协议方面研究了无线传感网络的睡眠节能机制,讨论了IEEE802.15.4在低功耗、低数据速率的无线连接领域应用的可行性.     

基于CC2520的ZigBee／IEEE.802.15.4的收发器电路

采用CC2520构成的IEEE802.15.4无线收发电路,工作在2.4GHz ISM频段,接收灵敏度为-98dBm,可编程输出功率达＋5dBm,适应DSSS基带,支持IEEE802.154、ZigBee协议。介绍了CC2520的基本特性和由其构成的应用电路,以及射频电路部分的PCB设计。     

Experimental analysis of IEEE 802.15.4a CSS ranging and its implications

The IEEE 802.15.4a Chirp Spread Spectrum (CSS), known to be resistant to electromagnetic disturbances, performs precise ranging. This work aims to analyze the performance and characteristics of CSS ranging in indoor environments under actual real-life conditions. The results indicate that unpredictable multi-path effects due to surrounding deployment environments may cause unreliable ranging distances in indoor environments. This phenomenon may critically influence the positioning algorithm. To address this issue, this research proposes a simple scheme to estimate the reliability of measured distance.     

基于IEEE 802.15.4无线传感器网络的山体滑坡检测系统

该文通过分析无线传感器网络的特点,提出无线传感器网络在山体滑坡检测方面的应用,并进行检测系统的设计,同时对系统设计关键问题提出相应的解决方案。     

基于ZigBee技术的无线数据采集网络

结合产品研发成功的实践,简单阐述了ZigBee技术及其无线智能数据采集网络的发展、现状及前景.     

Strategies for improving performance of IEEE 802.15.4/ZigBee WSNs with path-constrained mobile sink(s)

Most of the existing works on the topic of sink mobility in wireless sensor networks (WSNs) are of purely theoretical nature. The aim of this paper is to discuss the challenges as well as potential benefits associated with the use of mobile sinks in WSNs that operate in space-constrained environments and employ real-world technology. Specifically, we examine the pros and cons of deploying path-constrained sink mobility in the framework of IEEE 802.15.4/ZigBee enabled sensor networks.The main contributions of this paper are as follows: First, we demonstrate that the advantages of deploying path-constrained sink mobility, as identified in one of our earlier works [4], are not fully applicable to ZigBee WSNs. Specifically, our OPNET-based simulation study shows that in ZigBee WSNs the findings from [4] hold only conceptually, at the highest level of user-data routing. However, once all of the mobility-related overhead is accounted for, no actual benefit of deploying a mobile-over deploying a static-sink can be observed. Subsequently, we propose the use of three mechanisms for control of mobility-related overhead in ZigBee WSNs: Suppressed Route Discover, Node Association Based on Residual Energy, and Footprint Chaining. The most complex of the three mechanisms (Footprint Chaining) is studied in detail, and conditions under which this technique achieves optimal performance are precisely identified. The presented simulation results prove that with the three proposed mechanisms in place the benefits of mobile-over static-sink deployment can be regained, almost to the same extent as theoretically identified in [4].To our knowledge, this paper is one of the first attempts to bring the topics of path-constrained sink mobility and ZigBee standard together. It is also the first published work to propose improvements to the current ZigBee standard specifically targeted for WSNs that involve the use of mobile sinks.     

基于ZigBee的无线传感器网络设计与实现

无线传感器网络是由部署在监测区域内大量的廉价微型传感器结点组成,具有传感器节点密度高,网络拓扑变化频繁,以及节点的功率、计算能力和数据存储能力有限等特点。该文介绍了ZigBee网络与GSM/GPRS网络相结合实现远程监测的无线传感器网络的软件与硬件总体设计方法。     

基于ZigBee协议的无线传感网路及应用

无线传感网络因其巨大的应用前景,已经引起了学术界的高度关注,成为科学界研究的热点问题之一。本文先对无线传感网路进行基本概述,接着介绍了ZigBee协议,最后以家用自动化的实例描述了基于ZigBee协议的无线传感网路及应用。     

低能耗无线传感器网络节点的设计

该文介绍了基于IEEE802．15．4标准的无线通信协议ZigBee的协议结构和技术的特点,以降低能耗、节约成本为出发点,从硬件和软件两方面．提出了基于ZigBee的无线传感网络节点的基本构架,设计了一种通用节点的软硬件平台。     

ZigBee的无线传感闭环监控系统设计

采用TI公司的CC2530Z igBee芯片为核心单元,基于ZigBee的点对点通信模式,设计并实现了一种低成本、低功耗、可靠、实用的无线传感闭环监控系统。该系统能够全面监控感知区域的温度、湿度、光强、火焰、可燃气体浓度等参数,并可设置安全临界值,一旦环境条件超出临界值,开启自动闭环控制。     

基于ABE算法的2.4GHz IEEE 802.15.4网络模拟研究

针对IEEE 802.15.4网络的MAC层采用基于时隙的CSMA/CA标准算法可能引发数据封包碰撞和网络拥塞的问题,参考ABE算法对标准算法进行了改进,并采用NS-2网络模拟软件对基于时隙的CSMA/CA标准算法与ABE算法对2.4 GHz频段上的IEEE802.15.4星型网络性能进行了模拟实验。结果表明,基于ABE算法的2.4 GHz IEEE 802.15.4网络在网络吞吐量、数据封包成功传输率、网络公平性、LQI类型封包遗失数量等方面的性能都得到了有效提升。     

ZigBee无线传感网络与IP网络的网关设计

在zigBee协议栈和TCP／IP协议栈的基础上,通过分析zigBee网络与IP网络的Zigl3ee网关的逻辑模型,根据ARP协议提出了ZigBee路由表控制层,实现了zigBee协议与TCP／IP协议的转换。Zigbee网关使Zigbee网络和IP网络融为一体,实现了无线传感网与互联网的数字信息交互与共享。     

基于ZigBee协议的无线传感器网络研究

长期以来,业界一直想要建立一种低价、低传输率、短距离、低功率的无线通讯标准.Bluetooth的出现一定程度上解决了这一问题,但是具有Bluetooth功能的传输模块售价一直居高不下,严重影响了其技术的普及和推广.ZigBce是一种新兴的近距离、低复杂度、低功耗、低数据速率、低成本的无线网络技术,它是一种介于无线标记技术和蓝牙之间的技术提案,主要用于近距离无线连接.结合传感器技术,通过使用CHIPCON公司最新的CC2430的射频SoC芯片介绍了Zig-Bee协议的无线传感器网络系统的开发与应用,并给出了一个实际系统的软硬件设计方案.最后对该设计方案进行测试,给出测试结果,证明了该方案的可行性.     

Design and implementation of enhanced IEEE 802.15.4 for supporting multimedia service in Wireless Sensor Networks

Recently, there has been a growing demand to incorporate multimedia content delivery over the Wireless Sensor Networks (WSNs). This feature could not only enhance several existing applications in the commercial, industrial, and medical domains, but could also spur an array of new applications. However, the efficient gathering of still images, audio, and video information in WSNs imposes stringent requirements on the throughput and energy consumption. Most wireless communication standards with high or moderate data throughputs do not focus primarily on energy efficiency. The IEEE 802.15.4 WPAN standard provides a widely accepted solution for low-cost and low-power wireless communication, with a potential to cater to many types of application scenarios. IEEE 802.15.4 MAC includes features such as its dual operational modes (Non-Beacon-enabled mode/Beacon-enabled mode), which make this standard more attractive for providing multimedia services over the networked sensors. Its Beacon-enabled mode can conserve energy by using the RF sleep mechanism, but it is limited by the lower data throughput. On the other hand, the Non-Beacon-enabled mode can offer higher data throughput but at the expense of significant energy consumption, mainly due to the idle listening problem. In order to overcome these issues, we propose an enhancement to IEEE 802.15.4, named TEA-15.4, which adaptively adjusts the active period based on traffic information. To detect data traffic in the network, the proposed scheme utilizes two techniques: Arbitrary Traffic Signal (ATS) and Traffic Time-Out (TTO). By utilizing these two techniques, the proposed TEA-15.4 can not only support enough data throughput to carry out multimedia communications, but also offer lower energy consumption for the sensing device in WSNs. For performance evaluations, we implement our proposed scheme and the IEEE 802.15.4 full-standard on the TinyOS. Based on the results gathered from testbed experiments and the TOSSIM simulator, TEA-15.4 is shown to be a suitable mechanism for Wireless Multimedia Sensor Networks (WMSNs).     

IEEE802.15.4动态自适应CSMA/CA算法设计与仿真

在无线传感器网络中,节点的业务负载是随网络节点的位置和网络运行的时间不断变化的,又由于每一个节点能量有限,功耗是无线传感器网络性能的重要参数之一。针对无线传感器网络的这些特点,对IEEE802.15.4MAC层协议的关键技术进行了阐述,讨论了CSMA/CA信道访问机制在动态自适应方面的不足,进而设计提出了一种基于动态自适应的低功耗退避算法-DA-CSMA/CA算法,最后对该算法进行了仿真分析。仿真结果表明,该算法在网络拓扑相对固定的环境中能在低功耗的前提下很好地适应网络流量的变化。     

ZigBee无线传感器网络的有线通信与管理

针对无线传感器网络信息的有效管理,本文结合ZigBee技术及可视化程序设计语言Visual Basic 6.0,实现了无线传感器网络信息的有线传输及有效管理,并将其应用在电力设备测温中。文中详细阐述了传感器节点的硬件设计、软件设计及上位机(PC)监控界面的设计,并给出了与通信相关的源程序。     

ZigBee无线传感器网络协议及仿真设计

以ZigBee为代表的低速率无线局域网与IEEE 802.15.4标准相结合,实现无线传感器网络WSN和Internet的互通,是WSN的发展方向。通过对ZigBee和IEEE 802.15.4的分析研究,并针对IEEE 802.15.4规范规定的物理帧、MAC帧的具体格式,进行了仿真关联平台的设计,为ZigBee/IEEE 802.15.4网络设计打下了坚实的基础。ZigBee网络的应用配置、性能分析和改进优化等,也是今后研究的方向。