03-07-2012, 03:35 PM
IEEE 802.16
[attachment=26547]
Introduction
802.16 is wireless access at Broadband speeds. It is referred to at WiMax.
It is set to conform to the following standards: European Telecommunications Standards Institute HIPERMAN
Although the 802.16 family of standards is officially called WirelessMAN in IEEE, it has been commercialized under the name “WiMAX” (from "Worldwide Interoperability for Microwave Access") by the WiMAX Forum industry alliance.
Necessity and History
The broadband wireless access (BWA) industry desperately needed a consistent multi-spectrum defining interoperability standard for years.
When the cable industry accepted the data-over-cable service interface specification (DOCSIS) as a standard, prices dropped rapidly, customer counts rose and cable became the fastest-growing broadband player in the industry.
BWA industry needed such a standard.
802.16
The first version of the WiMax standard addressed spectrum ranges above 10 GHz (specifically 10 GHz to 66 GHz).
Line-of-sight (LOS) is a primary issue in this range, multipath was addressed in this first version with orthogonal frequency division multiplexing (OFDM) techniques.
It supports wide channels, defined as being greater than 10 MHz in size.
802.16a
The 802.16a update added support for spectrum ranges of 2 GHz to 11 GHz.
It addressed both licensed and unlicensed ranges.
It also incorporated non-line-of-sight (NLOS) capability.
This version enhanced the medium access control (MAC) layer capabilities.
It also improved quality of service (QOS) features.
[attachment=26547]
Introduction
802.16 is wireless access at Broadband speeds. It is referred to at WiMax.
It is set to conform to the following standards: European Telecommunications Standards Institute HIPERMAN
Although the 802.16 family of standards is officially called WirelessMAN in IEEE, it has been commercialized under the name “WiMAX” (from "Worldwide Interoperability for Microwave Access") by the WiMAX Forum industry alliance.
Necessity and History
The broadband wireless access (BWA) industry desperately needed a consistent multi-spectrum defining interoperability standard for years.
When the cable industry accepted the data-over-cable service interface specification (DOCSIS) as a standard, prices dropped rapidly, customer counts rose and cable became the fastest-growing broadband player in the industry.
BWA industry needed such a standard.
802.16
The first version of the WiMax standard addressed spectrum ranges above 10 GHz (specifically 10 GHz to 66 GHz).
Line-of-sight (LOS) is a primary issue in this range, multipath was addressed in this first version with orthogonal frequency division multiplexing (OFDM) techniques.
It supports wide channels, defined as being greater than 10 MHz in size.
802.16a
The 802.16a update added support for spectrum ranges of 2 GHz to 11 GHz.
It addressed both licensed and unlicensed ranges.
It also incorporated non-line-of-sight (NLOS) capability.
This version enhanced the medium access control (MAC) layer capabilities.
It also improved quality of service (QOS) features.