Wireless networks - Lecture 42: IEEE 802.16. The main topics covered in this chapter include: IEEE 802.16 overview; WiMAX forum; characteristics of 802.16 frequency ranges; provide high-speed mobile data and telecommunications services; orthogonal frequency division multiplexing (OFDM);...
Wireless Networks Lecture 42 IEEE 802.16 Dr Ghalib A Shah WiMAX Basics WiMAX or 802.16 is an effort by the IEEE to develop a standards based air interfaces for the licensed and unlicensed radio frequencies from to 66 GHz The approach they have taken is to develop a common MAC – Media Access Control sub layer of the data link layer Then to offer differing physical layers to accommodate the needs of the different frequencies and regulatory environments The IEEE believes that the existing approaches to delivering wireless data services have the potential for long term growth when used outside of the local area network 2 IEEE 802.16 Overview Family of standards for wireless metropolitan area networks (WMAN) Provide broadband (i.e., voice, data, video) connectivity Specifies the air interface, including the medium access control (MAC) layer and multiple physical layer specifications 802.16e is an amendment to 802.16d (fixed or nomadic wireless broadband) to support mobility ► Vehicular speeds up to 75 mph WiMAX Forum Formed in J une 2001 to promote conformance and interoperability of the 802.16 standard Develops “system profiles” that define mandatory and optional features of standard IEEE®802.16e Mobile Broadband Wireless Amendment Mandatory and Optional Features Mobile WiMAX System Profile Release-1 IEEE®802.16-2004 Fixed Broadband Wireless Standard [1] 802.16 Evo lutio n 802.16 Dec 2001 • Original fixed wireless broadband air Interface for 10 – 66 GHz • Lineofsight only • PointtoMultiPoint applications 802.16a Jan 2003 • Extension for 211 GHz • Nonlineofsight • PointtoMultiPoint applications 802.16d Oct 2004 • Revised and replaced previous versions • WiMAX System Profiles 802.16e Dec 2005 [2] • MAC/Physical layer enhancements to support subscribers moving at vehicular speeds Characteristics of 802.16 Frequency Ranges 10 - 66 GHz ► ► ► ► Short wavelength Line-of-sight (LOS) required Negligible multipath The commonly used frequencies in this range are 10.5, 25, 26, 31, 38, and 39 GHz – 11 GHz ► ► ► ► Longer wavelength LOS not required Improved range and in-building penetration Multipath effects may be significant IEEE 802.16 Standard 802.16 802.16d/Hipe rMAN 802.16e Co mple te d De c e mbe r 2001 June 2004 (802.16d) Es timate 2005 S pe c trum 10 66 GHz