ABSTRACT
CONTENTS 2.1 Overview of WiMAX ................................................................................. 16 2.2 WiMAX Standards ...................................................................................... 16
2.2.1 802.16 ................................................................................................ 17 2.2.1.1 Network Topology .......................................................... 17 2.2.1.2 802.16 Protocol Stack ....................................................... 17 2.2.1.3 Modulation Technologies ............................................... 19 2.2.1.4 Duplexing Technologies ................................................. 19 2.2.1.5 Multiplexing Technologies ............................................. 20 2.2.1.6 Quality of Service ............................................................ 20
2.2.2 802.16a .............................................................................................. 20 2.2.2.1 Flexible Bandwidth ......................................................... 21 2.2.2.2 Mesh Topology ................................................................. 21 2.2.2.3 Orthogonal Frequency Division Multiplexing ............ 23 2.2.2.4 Adaptive Modulation ..................................................... 23
2.2.3 802.16-2004 ....................................................................................... 24 2.2.4 802.16e .............................................................................................. 24 2.2.5 Other IEEE 802.16 Family Standards ........................................... 25
2.2.5.1 802.16c ............................................................................... 25 2.2.5.2 802.16.2-2001 ..................................................................... 26 2.2.5.3 802.16.2-2004 ..................................................................... 26 2.2.5.4 802.16f-2005 ...................................................................... 27 2.2.5.5 IEEE Standard 802.16/Conformance01-2003 .............. 27 2.2.5.6 IEEE Standard 802.16/Conformance02-2003 .............. 27 2.2.5.7 IEEE Standard 802.16/Conformance03-2004 .............. 27
2.3 WiMAX Applications ................................................................................. 27 2.3.1 WMANs ........................................................................................... 28 2.3.2 Rural Area Broadband Services .................................................... 28 2.3.3 Last-Mile High-Speed Access to Buildings ................................. 29 2.3.4 Wireless Backhaul ........................................................................... 30 2.3.5 Enterprise/Private Networks ....................................................... 30
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2.3.6 Wireless Video Surveillance .......................................................... 31 2.3.7 Other Applications ......................................................................... 31
2.4 Conclusion ................................................................................................... 32 References ............................................................................................................ 32
The demand for broadband services is growing sharply today. The traditional solutions to provide high-speed broadband access is to use wired access technologies, such as cable modem, digital subscriber line (DSL), Ethernet, and fiber optic. However, it is too difficult and expensive for carriers to build and maintain wired networks, especially in rural and remote areas. Broadband wireless access (BWA) technology is a flexible, efficient, and cost-effective solution to overcome the problems. The global deregulation of radio spectrum also encourages the development of BWA technologies. WiMAX is one of the most popular BWA technologies today, which aims to provide highspeed broadband wireless access for wireless metropolitan area networks (WMANs). The air interface standard, IEEE 802.16, commonly referred to as WiMAX, is a specification for broadband wireless communication standards developed for WMANs, which supports fixed, nomadic, portable, and mobile broadband accesses and enables interoperability and coexistence of BWA systems from different manufacturers in a cost-effective way. Compared to the complicated wired network, a WiMAX system only consists of two parts: the WiMAX base station (BS) and WiMAX subscriber station (SS), also referred to as customer premise equipments. Therefore, it can be built quickly at a low cost. Ultimately, WiMAX is also considered as the next step in the mobile technology evolution path. The potential combination of WiMAX and CDMA standards is referred to as 4G. This chapter gives an overview of the WiMAX standards and applications.
