Mobility Issue on Octagonal Structured ZigBee Network Using Riverbed

Wireless Sensor Network (WSN) is a special type of communication medium through distributed sensor nodes. Popular wireless sensor nodes like ZigBee have splendid interoperability after IEEE 802.15.4 standardization in the domain of wireless personal area network (WPAN). ZigBee has another great feature mobility that makes the ZigBee network more versatile. The mobility feature of ZigBee mobile nodes has a greater impact on network performance than fixed nodes. This impact sometimes turns into more severe because of network structure and mobility model. This study mainly focuses on the performance analysis of the ZigBee mobile node under Random and Octagonal mobility management model with the Tree routing method. The Riverbed academic modeler is used to design, implement and simulate the ZigBee network under certain conditions. This study also presents a competitive performance analysis based on ZigBee mobile nodes transmitter and receiver characteristics under the observation of the mobility model. This indicates that Octagonal mobility model exhibits better performance than the Random mobility model. This study will constitute a new way for further designing and planning a reliable and efficient ZigBee network.

A Study on Priority Based ZigBee Network Performance Analysis with Tree Routing Method

The Wireless Sensor Network (WSN) is spatially distributed autonomous sensor to sense special task. WSN like ZigBee network forms simple interconnecting, low power, and low processing capability wireless devices. The ZigBee devices facilitate numerous applications such as pervasive computing, security monitoring and control. ZigBee end devices collect sensing data and send them to ZigBee Coordinator. The Coordinator processes end device requests. The effect of a large number of random unsynchronized requests may degrade the overall network performance. An effective technique is particularly needed for synchronizing available node’s request processing to design a reliable ZigBee network. In this paper, region based priority mechanism is implemented to synchronize request with Tree Routing Method. Riverbed is used to simulate and analyze overall ZigBee network performance. The results show that the performance of the overall priority based ZigBee network model is better than without a priority based model. This research paves the way for further designing and modeling a large scale ZigBee network.

A Study of Address Shortage in a Tree Based ZigBee Network for Mobile Health Applications

There are increasing demands for mobile health applications. This paper reports the development of a mobile health profile which dedicates to mobile applications. The mobile health profile is developed in association with the ZigBee Health Care profile and the IEEE 11073 standard which is normally applied to non-mobile applications. Since mobile sensors have to be carried by patients, the mobile health profile must facilitate mobility. In this investigation, a ZigBee fixed-mobile network (ZFMN) is defined and developed to supplement the ZigBee Health Care Profile for patient monitoring. The mobility study of ZigBee is performed using a random waypoint OPNET simulation model. In a ZFMN, the critical issue of address shortage is identified and discussed. It is analyzed that the problematic address shortage in a ZFMN may generate a huge amount of orphaned end devices and thus the packet drop percentage may potentially rise to 70%, rendering the network unable to function properly. Without introducing additional governing schemes, it is evaluated that the communication of the entire ZigBee network may paralyze. Further vigorous test are performed (by OPNET) on the communication capability of ZFMN when devices are randomly moving and sending data in 1s. It is vital to point out that under the adverse condition of address shortage, the performance of a ZFMN is still encouraging as long as the packet drop percentage has been kept below 3% before running out of address. The conclusion drawn in this analysis is that the packet drop percentage should be kept below 3% to provide a satisfactory QoS for an effective mobile health application using ZFMN such as patient monitoring. Such finding is also important for other future mobile application design of ZigBee. The address shortage issue is left as an open problem that needs attention for a resolution.

Implementation of ZigBee Network Layer Based on AODVjr and Tree Hirarchical Route Algorisms

The basic functions and the relative concepts of ZigBee network are analyzed in this paper. The implementation method of ZigBee network layer is proposed, it includes how to build a new network, add a node to the network, send data and receive data. The distributing address assigning mechanism, the tree hierarchical route algorism and AODVjr algorism are implemented. Finally, the ZigBee network layer protocol is tested.

An Implementation Method for ZigBee Network Layer

The basic functions and the relative concepts of ZigBee network are analyzed in this paper. The implementation method of ZigBee network layer is proposed, and then a algorism about how to built a Zigbee network is defined. Finally, a experiment is simulated by prove the liveness of the Zigbee network, the result shows the PC can get the monitored data from the Zigbee network.

Optimization of ZigBee Network Parameters for the Improvement of Quality of Service

Network enabled digital technologies are offering new and exciting opportunities to increase the connectivity of devices for the purpose of home and office automation. ZigBee (IEEE 802.15.4) is such a digital wireless technology that is used for personal area networks. In this paper, an office automation network using the combination of fixed and mobile IEEE 802.15.4 has been deployed and analyzed. The QoS parameters of the network as the performance metrics like throughput, MAC delay and data dropped rate have been investigated. Finally the network has been finalized with the optimized QoS parameters.

Reconfigure ZigBee Network Based on System Design

This article analyses key technology used by network layer based on ZigBee technology. Then a reconfigure network as well as its strategy of forming network and distributing node is given. The simulation proved that the stability of reconfigure network and the ability of transmitting pass through obstacle are better than tradi-tional network;it has an active significance for shorter delay because of the flexible of the improved forming network strategy.

A Comprehensive Analysis of Quality of Service (QoS) in ZigBee Network through Mobile and Fixed Node

The standard specification of IEEE 802.15.4 is called ZigBee Propocol. ZigBee protocol required security, low data transfer rate, power efficient network. In addition, the ZigBee mobility function makes the ZigBee network more interactive and multi-purpose. The ZigBee mobile node has a significant effect on network parameters, namely MAC delay, end-to-end delay, MAC throughput and network load. However, a particular significant ZigBee node affects network data traffic and reduces the strength of the Quality of Service (QoS). The key issues are to analyze the QoS in order to increase overall performance of the network. The study proposes a ZigBee network with the mobile node and fixed node based on a variety of MAC layer settings. The Riverbed Network Simulator (Academic Modeler Release 17.5) is used for configuring and simulating the ZigBee network in a variety of conditions. The simulation results show that ZigBee with a fixed node performs better than the ZigBee mobile node. The ZigBee network with fixed node produces a lower network load and a high ratio of successfully transmitted data. The analysis of this study allows the ZigBee network to be better designed.

基于ZigBee通信网络的农机作业监测系统设计

首先,介绍了ZigBee通信网络技术,并设计了系统总体设计方案;然后,分别从转速测量模块、振动信号采集模块和割台高度检测设计了系统硬件部分;最后,针对设备节点和协调器两部分设计了ZigBee无线网络传输软件,实现了农机作业监测系统。测试结果表明:系统能够正确采集农机作业参数并通过无线网络发送到云平台,证明系统的可靠性和可行性。

基于Zigbee技术的无线辐射监测系统的建立

基于Zigbee技术的无线辐射监测系统可对众多辐射监测仪的监测数据进行实时采集和统计分析,无需布线,组网灵活。该辐射监测系统包括多台辐射监测仪及上位机监测平台。辐射监测仪负责测量辐射信息,并将辐射测量结果通过Zigbee模块发送出来。辐射监测平台负责接收辐射测量结果,并将数据在监测平台上进行显示和存储。对辐射监测仪和辐射监测系统进行测试,测试结果表明:辐射监测仪可对在环境本底的基础上增加0.1μSv/h的γ辐射给出可靠报警;辐射监测系统可自动进行无线网络连接,整体运行稳定,数据采集准确,可实现对各个辐射监测仪监测数据的实时采集和存储。

基于ZigBee和云平台的大棚环境监测系统设计与实现

针对温室大棚环境的实时监测问题,利用ZigBee无线传感网络和GPRS远程传输技术,设计远程监测系统,在云端搭建服务器,采用Spring Boot服务框架,开发Android移动端APP.测试表明,系统能对温室大棚环境进行远程监测和预警,系统运行稳定、部署灵活、便利性好,有利于提高大棚农业管理水平.

基于RSSI参数动态修正的ZigBee室内定位算法

ZigBee室内定位技术近年来发展迅速,但使用固定路径损耗模型的传统算法环境适应能力较差,会引起较大定位误差,影响定位精度。本文提出一种基于ZigBee平台的对数路径损耗模型参数动态修正的室内定位算法。首先经过高斯滤波对所得RSSI值进行筛选优化,然后根据锚节点之间的距离以及RSSI值来动态修正对数路径损耗模型参数,包括路径损耗因子以及距待测节点处的信号强度值,从而得到当下环境中具体的对数路径损耗模型;再利用卡尔曼滤波对现有的定位参数进行二次修正,以更正上述算法中因时刻变动引起的环境变化导致的定位偏差。实验结果表明,该定位算法比基于ZigBee的固定路径损耗模型定位性能提升了46.8%,可以改善因环境变化产生的定位误差问题。

基于ZigBee无线传感网络的分簇时间同步算法

在无线传感网络中,时间同步技术在信道分配、数据收发、休眠调度中都有着关键作用。目前已有的时间同步算法,有些同步精度不高,有些需要进行频繁的数据交换导致功耗过大。因此设计出能同时满足高精度和低功耗两个要求的算法势在必行。提出的算法通过改变网络拓扑结构,构造分簇函数,选出簇头,进行分簇。在新的网络拓扑中,协调器与簇头之间通过频偏补偿来保证同步的精度,簇头与成员节点之间通过三次通信消除时延进行时间同步,从而实现全网时间同步。仿真结果表明,整个网络在较低功耗下也能有较高的同步精度。

基于ZigBee组网的停车场管理系统设计

随着现代社会经济的高速发展,汽车普及率越来越高,汽车保有量越来越多,大中城市普遍出现了“停车难,停车慢”的问题,为此提出一种基于ZigBee组网的停车场管理系统。本系统以CC2530单片机作为核心器件,前端采用超声波测距技术识别车位是否空闲,并通过串口显示屏与空车位状态指示灯引导用户快速找到停车位;当用户停好车后,通过人体红外检测技术和照明装置引导用户找到最近的出口,从而实现快速离场。后端采用云平台技术,在网络覆盖范围内可实时查看该停车场信息。本系统较传统的停车场管理模式,能有效降低停车时耗与能耗,使停车场内车辆管理更智能、准确、便捷和高效,用户停车体验感也更好,对解决我国城市停车难问题具有积极的应用价值和实践意义。

基于ZigBee的森林火灾预警监测系统的研究

针对森林火灾具有突发性和预防难度大的特点,设计了一种基于ZigBee的森林火灾预警监测系统。该预警监测系统将ZigBee的无线组网技术与无线传感器网络技术相结合,对火焰、湿度、温度、烟雾浓度等参数进行实时监测,并通过北斗短报文系统实现无地面通信环境下的导航、定位、数据采集和传输;同时,该预警监测系统设置了自供给电源模块,可以实现监测的实时性和连续性,大大提升了森林防火智能化程度。

基于ZigBee技术的无线灯光智能控制系统设计

全球经济快速发展,电力能源紧缺,传统照明模式不能满足现有的照明和节能需求。针对此问题,文章设计了一种基于ZigBee技术的新型智能灯光控制系统,实现了教室照明系统分散与集中管理、本地与远程监控管理相结合的功能,具有一定的理论价值和实践意义。

基于ZigBee物联网技术机房物料管理系统的设计

传统机房物料管理模式存在人力劳动投入大、物料管理出错率高等问题,实现机房物料管理数字化和智能化是现代机房管理的必然趋势。本项目设计以ZigBee无线物联网技术为核心控制芯片,应用RFID射频识别技术、人体检测技术和液晶触摸屏技术组成局域机房物料信息检测、登记和数据显示系统,系统通过WiFi模块将数据上传到OneNET物联网云平台,实现物料与网络相连。系统能够实现物料存入和借出的实时记录,管理人员可以现场通过液晶屏观测物料信息,也可以通过手机或者电脑登录OneNET云平台远程观测机房物料信息,优化机房管理制度,减少机房物料出错率,降低机房管理人力投入,推进机房管理现代化建设。

基于ZigBee技术的CAFe无线温度监测系统设计

由于CAFe装置温度监测点需求众多,若采用有线监测方式会产生大量的信号传输线缆,加剧装置周围的布线繁杂程度并且会导致其他设备故障排除困难,因此需要采取无线化的温度监测方式。文中设计一套基于ZigBee技术的无线温度监测系统,主要由数据采集层、传输控制层和用户层组成。系统通过使用ZigBee无线数传电台E180-DTU模块将多个温度监测点拓扑成一个无线传感器网络,并由串口服务器接入EPICS控制网,使用StreamDevice设备支持开发IOC程序对网络中各节点温度进行获取与发布,最后通过上层客户端对温度监测数据进行全局实时显示与报警。通过设置不同的无线网络拓扑结构,该系统能够非常容易地应对不同规模的温度监测需求。目前该样机系统已用于加速器上RFQ和MEBT段的温度监测,并且扩展监测了设备机房的多个环境温度监测点位,具有一定的应用价值。

基于ZigBee的工厂化堆沤有机肥监控系统设计

针对工厂化堆沤有机肥过程中相关数据实时监测与废物安全排放的要求,利用物联网技术设计了一种基于ZigBee的工厂化堆沤有机肥监控系统,主要分为硬件电路设计与软件设计.硬件部分采用模块化方法对CC2530F256最小单元进行规划,扩展数据输入和数据输出两大功能板块相应接口,设计了数据采集与数据执行节点.软件部分采用C语言进行编程,对组网、数据传输等环节进行程序设计,并依托ETL工具对数据进行清洗,采用自适应加权平均融合算法对数据进行融合.为检验系统的功能,进行了为期1个月的性能测试,测试结果表明:系统数据采集、数据传输、数据储存、远程监控功能完备,数据丢包率为1.2%,机构平均响应时间为1.25 s,误动作次数为0,温度误差范围为±1.8℃,EC(电导率)值偏差极值为0.02 mS/cm,pH值误差范围为±0.1,氨气浓度偏差极值为0.02 mg/L,系统运行情况稳定.

基于OneNET和ZigBee的多节点燃气监测

可燃性气体的泄漏是一种经常发生的安全事故,通常会对居民的安全造成巨大的威胁。为此,本文设计了一种具有实时性的多节点可燃性气体监测系统。首先,采用ZigBee组网的形式获取多个终端节点的MQ2气体传感器所采集到的可燃性气体浓度信息;然后,将燃气浓度信息汇聚到ZigBee协调器,并通过STM32与ESP8266组成的网关汇总上传到OneNET云端,从而实现多节点可燃性气体浓度信息的实时监测与控制。该系统具有良好的实时性和多节点监测特性,可以面向人口密度较高的社区,在智慧消防领域的应用前景广阔。