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ZigBee无线传感器网络研究及仿真
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摘要
ZigBee无线通信技术是一种新兴的短距离无线通信技术,具有低功耗、低速率、低时延等特性,具有强大的组网能力与超大的网络容量,可以广泛应用在消费电子品、家居与楼宇自动化、工业控制、医疗设备等领域。由于其独有的特性,ZigBee无线技术也是无线传感器网络的首选技术,具有广阔的发展前景。ZigBee协议标准采用开放系统接口(OSI)分层结构,其中物理层和媒体接入层由IEEE802.15.4工作小组制定,而网络层,安全层和应用框架层由ZigBee联盟制定。
     本文首先介绍了ZigBee的发展前景与研究意义,并列举了一些ZigBee的应用例子与国内外对ZigBee的研究状况;接着根据IEEE 802.15.4标准规范与ZigBee标准规范,简单扼要地阐述了ZigBee协议栈的物理层、媒体接入层、网络层、安全层和应用框架层等各层的功能以及各层间的接口。
     本文着重详细描述了ZigBee无线传感器网络网关与网络节点的研发、ZigBee无线传感器网络网关与因特网的连接、通过因特网访问与控制远程的ZigBee无线传感器网络节点等实现方法,从而实现无线传感器网络节点对各种传感器信息的采集、传输和远程控制功能。此外,整个无线传感器网络包括网关与网络节点已通过实验验证。
     本文最后使用NS2网络仿真软件对ZigBee无线网络进行仿真研究。首先利用NS2仿真小型网络,并与真实的ZigBee小型网络作对比,包括网络协调器的启动过程,网络节点加入网络的过程,与丢包率等因素的对比。之后使用NS2仿真大型ZigBee无线网络,并分析了路由协议,丢包率,端到端延迟,网络抖动率等,获得仿真结果。
ZigBee wireless technology is a new short-distance wireless communications technology, and it is a low-power, low speed and low latency wireless standard. ZigBee has strong network capability and large network capacity and it can be widely used in consumer electronics, home and building automation, industrial controls, medical sensor application and other fields. For its special feature, ZigBee is the best choice for wireless sensor network. ZigBee stack architecture is based on the standard Open Systems Interconnection (OSI) seven-layer mode. The IEEE 802.15.4 standard defines the two lower layers: the physical (PHY) layer and the medium access control (MAC) sub-layer. The ZigBee Alliance builds on this foundation by providing the network (NWK) layer and the framework for the application layer.
     First of all, the paper introduces the development and research significance of ZigBee, also lists some application examples of ZigBee and describes the development status of ZigBee in China and other counties. Then, chapter 2 describes the functions of all layers and the interface of each layer shortly according to IEEE 802.15.4 standard and ZigBee specification.
     The article describes the realization of some important processes in detail, including the realization of ZigBee wireless sensor network gateway, the connection of Internet and ZigBee wireless network, and the realization of ZigBee network node device which can be accessed by Internet. Upon these research and realization, the wireless sensor network has functions such as collecting connected sensors information, transmitting the sensors information and realizing remote control. Besides, wireless network gateway and node device have been certified by experiment successfully.
     Finally, the article describes the simulation of ZigBee wireless network using NS2, a sort of network simulation software. First, using NS2 simulates a small ZigBee network and with the comparison to the real ZigBee small network, including the start process of network coordinator, the join network process of node device and factors such as packet drop rate. After the large-scale ZigBee wireless network simulation using NS2 and analysis of the routing protocol, packet drop rate, end-to-end time delay and network jitter, access to the significant simulation results.
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