研究生专业英语报告

Research on Zigbee Wireless Communication

Wei Dong

Wuhan University of Technology

Wuhan,China

vicdw@

Abstract—Zigbee wireless communication technology is a kind of newly arisen wireless network technology; the characteristic is short distance communication, low speed, low power dissipation, and low cost. It, application of Zigbee wireless communication technology, makes that inconve-nient wire repeat can be avoided in the area of home, factory, hospital, etc. With the rapid development of IT industry and the strong functional expansion of SCM, Zigbee wireless communication technology will play an important role in wireless sensor network (WSN). In this paper, Zigbee wire-less communication technology and the process of establish-ing Zigbee network are introduced, the application of Zigbee wireless communication technology is studied in the real world.

Keywords--Zigbee;wireless communication technology; protocol stack; application

I. INTRODUCTION

With the development of network and communication

technology, the inconvenience of wiring is solved with WSN into people’s life; especially it has wide perspective

and practicability in the area of remote sensing, industrial automation control, and domestic appliance and so on. WSN has good functions of data collection, transmission, and processing. It has many advantages compared to tra-ditional wired network, for example, convenient organiz-ing network, small influence to environment, low power dissipation, low cost, etc. At present, near field wireless communication technology has been used widely, espe-cially Bluetooth, wireless local area network (WLAN), infrared, etc. But, they have a number of disadvantages, for example, complexity, large powerdissipation, short distance, networking in small scale. In order to satisfy the demand of low power dissipation and low speed among wireless communication devices, a new type of wireless net technology-Zigbee emerges as the times require. In this paper, we will introduce the networking technology and application of Zigbee wireless sensor.

In Section II, we will introduce the basic concepts of

Zigbee wireless communication technology, its origin and

Zigbee protocol stack. In Section III, the application of

Zigbee technology is introduced, Section IV is the con-

clusions.

II. THE INTRODUCTION OF ZIGBEE Zigbee Alliance was established in August, 2001, In-vensys Corporation, Mitsubishi electric company, Moto-rola Company, Philips semiconductor joined in Zigbee Alliance, they would research the next generation of wireless communication standards called Zigbee, Zigbee Alliance has had twenty-five members [1]. The basis of Zigbee is IEEE802.15.4 standard, but it only defines the lower two layers: the physical (PHY) layer and the me-dium access control (MAC) sub-layer, then the Zigbee Alliance builds on this foundation by providing the net-work (NWK) layer and the API is standardized. It could be embedded in all kinds of devices, support Geo-location function, and be used widely in area of ndustrial moni-toring, safety system, smart home, etc; the protocol is realized by protocol stack.

The Zigbee stack architecture [2], which is depicted in Figure 1, is made up of the physical (PHY) layer, the me-dium access control (MAC) sub-layer, the network (NWK) layer and the framework for the application layer, which includes thea pplication support sub-layer (APS), the Zigbee device objects (ZDO) and the manufactur-er-defined application objects.

The PHY layer has two separate frequency ranges: 868/915 MHz and 2.4 GHz. The 868 MHz is used in Eu-ropean, the 915MHz is used in America, and the 2.4 GHz is used all over the world. The MAC sub-layer controls access to the radio channel, a CSMA-CA mechanism is used to transmit beacon frames,synchronization and pro-viding a reliable transmission. The responsibilities of the Zigbee NWK layer are used to discovery one-hop neigh-bors and store pertinent neighbor information. Also it will make devices join and leave a network, keep frames route to their intended destinations. The responsibilities of Zigbee application layer is used to maintain tables for binding and forward messages between bound devices.

Figure 1 the Zigbee stack architecture

Each layer performs a specific set of services for the layer above: a data entity provides a data transmission service and a management entity provides all other ser-vices. Each service entity exposes an interface to the up-per layer through a service access point (SAP), and each SAP supports a number of service primitives to achieve the required functionality [2].

Zigbee 2004 stack is announced by Zigbee Alliance in