XPort与ZigBee模块的Internet接入技术

介绍一种由嵌入式设备组成的ZigBee无线网络接入Internet的技术。设计了由TCP/IP到串口的转换设备XPort与ZigBee模块组成的ZigBee网关,阐述了XPort与ZigBee模块的连接电路、工作方式以及ZigBee组网过程,实现了Internet网络远程访问和便捷控制家中的ZigBee无线智能家电设备的目标。     

一种轻量级无线传感网络网关设计

在基于ZigBee技术和GPRS的区域环境远程监控系统设计中,需要实现数据从ZigBee网络到GPRS的转换。针对系统中多种无线通信技术之间互联的需要,设计实现了一种轻量级无线通信网关。该网关主要由CC2430无线射频芯片和嵌入TCP/IP协议的GPRS模块组成,通过软、硬件设计,实现了数据从ZigBee网络到GPRS网络的传输。实际应用表明：网关满足了远程无线监控系统中协议转换的需要。     

LPC1227的远距离ZigBee无线网关设计

介绍了一种基于GPRS和远距离ZigBee无线通信技术的网关节点的软硬件设计方法与实现方案。网关采用基于Cortex—M0内核的LPC1227微控制器,结合GSM模块、ZigBee芯片和2．4GHz无线功率放大芯片,实现了GPRS网络、以太网和无线传感网络的互联。为测试网关功能,搭建了针对路灯节能、监控应用的上位机测试...     

小型网关／路由器DIY指南

Internet是由网络互联而成的网络,而实现网际互联的设备就是网关。任何用户都是通过网关连接到Internet的。Internet上的网关多数是专用的路由器和(三层以上)交换机,但也有为数不少的网关是由运行Linux/BSD的PC机配置而成,它们多兼有防火墙/NAT的功能。因为Linux和FreeBSD等系统都是在Internet上起源和发展的,与生俱来有强大的网络功能和丰富的网络应用软件,其TCP/IP栈的实现尤为成熟,Linux更是号称拥有业界最强的路由功能,加之两者都非常灵活、容易定制,所以深受资深网管和高水平用户的青睬。在一些中小型网络环境中得到了广泛的应用。     

基于CC2530无线传感网络的环境监测系统的设计

研究如何构建一个适合我国环境监测的ZigBee无线传感网络系统。针对ZigBee网络环境的特性,构建ZigBee服务器硬件与软件平台,基于ZigBee的无线网关,通过通用分组无线服务GPRS实现Internet对ZigBee网络各节点进行数据采集、控制、监控及状态显示等功能。     

基于Modbus协议的ZigBee/工业以太网网关设计

针时工业无线通信和工业以太网发展情况,提出一种ZigBee/工业以太网网关.网关应用层采用Modbus/RTU主从式协议,以太网传输层采用UDP协议.文中介绍了网关硬件、软总体设计,重点介绍了Zigbee/Modbus地址映射和收发缓冲区设计.网关硬件设计基于Rabbit3000MCU和SZ05-ZBEE ZigBee模块,软件设计基于Dynamic C和μC/OS-Ⅱ实时操作系统.     

面向智能家居应用的ZigBee-WiFi网关

ZigBee和WiFi是智能家居设备常用的两种无线通信技术,针对智能家居设备使用ZigBee自组网无法和用户WiFi网络中的智能终端直接通信的问题,设计面向家庭应用环境的ZigBee-WiFi无线网关.网关采用S3C6410作为控制核心,运行Linux操作系统,以USB连接无线网卡,以DMA通道连接CC2530模块.通过信道扫描切换的方案解决ZigBee和WiFi两种信号之间相互干扰的问题,通过数据线连接的方式给要加入ZigBee网络的新设备分发密钥.实验表明,所实现的无线网关信号稳定,丢包率低,实用性强,在智能家居系统中运行稳定、可靠.     

煤矿安全监测系统无线传感器网络网关设计

针对煤炭工业以太网络与井下ZigBee无线传感器网络异构互联的需要,提出了一种煤矿安全监测系统无线传感器网络网关设计方案;介绍了网关的软硬件实现要点,并在不额外移植新操作系统内核的情况下,对ZigBee协议栈Z-Stack的操作系统抽象层进行了相应扩展,以满足嵌入式网关系统任务实时性要求。测试结果表明,该网关实现了ZigBee无线传感网络和以太网的通信协议转换功能,保证了数据转发的实时性和可靠性。     

无线传感器网络与TCP/IP网络互联通信技术研究

提出了无线传感器网络与Intemet互联通信技术的代理服务器系统结构.设计了具有网络接口功能的代理网关节点.该节点作为无线传感器网络与Internet互联通信的代理网关,实现了远程访问和获取传感器网络监测的信息.给出了精简化的TCP/IP互联协议,以及代理网关主处理程序的软件实现.     

信息家电网关系统CGI程序设计与实现

本系统的目标是实现家电产品的网络化、信息化.家庭无线信息网关系统将实现Internet无线路由/网关功能,信息家电控制器则是由传统的家电控制器嵌入无线网络通信接口模块所构成,家庭无线信息网关和信息家电之间通过无线通信链路联结.通过无线信息网关,用户可以通过任何一台接入Internet的PC机或手提电脑对接入网络的信息家电进行控制、监视和操作,信息家电也能依据用户设置自动地向Internet上的指定网站或E-mail信箱发送消息.     

基于Matlab物联网网关的Modbus协议实现

实现了一种基于Matlab的物联网网关原型开发平台,以应用层协议——Modbus协议作为公共协议来解决多种传感网络协议不统一问题,实现了Modbus ZigBee网络、ModbusTCP/IP网络、Modbus串行链路的数据采集、传输和存储,以及对传感网的设备控制,最终通过Matlab中的Web服务发布技术将数据发布到Internet,以方便客户查询和控制.     

Transparent VPN failure recovery with virtualization

Cloud computing is widely used to provide today’s Internet services. Since its service scope is being extended to a wide range of business applications, the security of network communications between clients and clouds are becoming important. Several cloud vendors support virtual private networks (VPNs) for connecting their clouds. Unfortunately, cloud services become unavailable when a VPN failure occurred in a VPN gateway or networks. We propose a transparent VPN failure recovery scheme that can hide VPN failures from users and operating systems (OSs). This scheme transparently recovers from VPN failures by establishing VPN connections in a virtualization layer. When a VPN failure occurs, a client virtual machine monitor (VMM) automatically reconnects to an available VPN gateway which is geographically distributed and connected via leased lines in clouds. IP address changes are hidden from client OSs and servers via a packet relay system implemented by a relay client in the client VMM and a relay server. We implemented a prototype system based on BitVisor, a small client VMM supporting IPsec VPN, and evaluated the prototype system in a wide-area distributed Internet environment in Japan. Experimental results show that our scheme can maintain TCP connections on VPN failures, and performance overhead with the virtualization layer is around 0.6 ms to latency and 8%-30% to throughput.     

基于下一代Internet的服务管理研究

Internet is best effort network, on the whole, it doesn't provide any quality of service assurance for services. Especially,all kinds of stream media need more network performance and quality of service. Currently, because of existing many heterogeneous networks, such as telecommunication network, IP data network , mobile network and so on ,in order to break off this heterogeneous network isolated complexion ,research and developmentnext generation network must be carried out,only by this way,can these isolated heterogeneous network be merged into an all IP network. This network will provide enormous services for service users,how to manage these services effectively is a topic proposed by next generation internet. [1] gave research status for service management and advance,this paper researches service management requirement for next generation Internet and workflow etc,and based on these technique,a service management architecture model is proposed. It consists of service access layer, service deployment layer, service providing layer, service mapping layer, policy control layer and network element managing layer. These layers coordinate to implement service management.     

ZigBee无线网关在MODBUS通信中的应用

为了解决工业现场设备通信电缆不利于组装和维护,提出了利用ZigBee网关将所有设备组成无线网络实现无线通信。利用ZigBee协议栈应用层完成协议数据转换,基于地址映射表完成MODBUS站号和无线网络地址的匹配,实现MODBUS和无线网络的网关功能,完成数据透明传输。实际测试表明,无线模块的发射功率、接受灵敏度、通信距离、误包率、速度满足工业应用的实时性安全性要求,改进网络性能比传统网络大大提升,已应用于实际PLC通信和参数配置中,可代替传统通信方式。     

IPv6 based relay gateway protocol in hybrid networks

During the past few years, WMAN (Wireless Metropolitan Area Network) and WLAN (Wireless Local Area Network) provided fast, convenient and reliable solution for all kinds of users. With the development of the communication technology, the future wireless networks will allow mobile users access Internet anywhere, anytime. Therefore, it is a natural trend to combine different wireless networks to provide a seamless roaming for users. It is feasible for mobile terminal which have multiple modes to handoff between different networks. A relay gateway protocol for the WLAN-mode nodes (mono-mode WLAN nodes and dual-mode nodes) in the hybrid network of IEEE 802.16 WMANs and IEEE 802.11 WLANs is proposed to provide wider mobility. Dual-mode mobile nodes with good service can provide WLAN links to nearby WLAN-mode nodes with bad service or out of the WLAN coverage. Simulation results show that the relay gateway scheme can improve network performance of the hybrid networks. Moreover, the relay gateway method can bring additional service coverage and increase the capacity of WMANs and WLANs.     

A novel network mobility handoff scheme using SIP and SCTP for multimedia applications

In a heterogeneous wireless environment, seamless mobility is the basis of network support with which mobile users who roam between or among various wireless access networks are able to fully enjoy uninterrupted wireless services. When users are in a mass transportation vehicle, e.g., a bus or a train that provides network service, the vehicle can be regarded as a network which is serving users as it moves from one location to another. The movement of a network is called network mobility (NEMO). The network mobility protocol based on Mobile IPv6 as proposed by the Internet Engineering Task Force (IETF) in 2005 has some fundamental drawbacks, such as header overhead and the pinball problem. In this paper, we propose a novel hybrid method for network mobility called Hybrid-NEMO, which provides a soft handoff scheme at the transport layer basically utilizing SIP and SCTP protocols to ensure a lossless packet-transmission environment and less handoff-delay variation, which are critical in providing QoS voice and multimedia applications. Experimental validation and performance evaluation were also conducted in this study.     

SCTP: new transport protocol for TCP/IP

For the past 20 years (1980-2000), applications and end users of the TCP/IP suite have employed one of two protocols: the transmission control protocol or the user datagram protocol. Yet some applications already require greater functionality than what either TCP or UDP has to offer, and future applications might require even more. To extend transport layer functionality, the Internet Engineering Task Force approved the stream control transmission protocol (SCTP) as a proposed standard in October 2000. SUP was spawned from an effort started in the IETF Signaling Transport (Sigtrans) working group to develop a specialized transport protocol for call control signaling in voice-over-IP (VoIP) networks. Recognizing that other applications could use some of the new protocol's capabilities, the IETF now embraces SCTP as a general-purpose transport layer protocol, joining TCP and UDP above the IP layer. Like TCP, STCP offers a point-to-point, connection-oriented, reliable delivery transport service for applications communicating over an IP network     

An architecture for residential Internet telephony service

Network gateways are used to set up calls between the public switched telephone network (PSTN) and the Internet, but existing gateways support a relatively small number of lines. To meet the scalability and availability requirements of mass-market deployment of carrier-grade telephony services, the authors propose an architecture based on the decomposition of Internet gateway functionality. The media transformation function of today's H.323 gateways is separated from the gateway control function, and intelligence is centralized in a call agent. The Media Gateway Control Protocol is introduced; MGCP is an Internet draft currently under discussion by the IETF for standardizing the interface between a call agent and the media transformation gateway     

基于SIP和ZigBee的物联网家庭网关设计

给出了一种融合下一代网络核心控制协议SIP和短距离无线通信协议ZigBee的物联网家庭网关的设计方法。该方法通过对家庭网关的硬件设计、SIP方法及其XML消息体扩展应用设计以及ZigBee无线通信数据格式的设计,实现了家庭网关中的SIP与ZigBee协议的融合,最终通过Internet远程访问和控制基于ZigBee协议构建来实现物联网家庭网络。