Wireless networks - Lecture 42: IEEE 802.16

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