Standards for wireless networks IEEE UIT ETSI WAN W ide A rea N etwork PAN P ersonal A rea N etwork LAN L ocal A rea N etwork MAN M etropolitan A rea N etwork 802.15 802.11 802.16d 802.20 802.16e HiperPAN HiperLAN HiperMAN HiperACCESS IMT-2000 802.22
2000: Public auction in Venezuela of the 3400-3500 MHz frequency band to provide voice and data services
Unsuccessful for the following reasons:
Absence of standards
Need for line-of-sight between the base station and each client.
Both factors have a strong impact on the cost of deployment and motivated the establishment of a standard for networks of medium and long range, preferably removing the line of sight requirement. These features are met by the IEEE 802.16 standard, on which WiMAX is based .
In countries with limited telecommunications infrastructure, to provide fixed or nomadic access to voice and data using external antennas, possibly in combination with other technologies such as WiFi, PLC or Ethernet.
Based on the d amendment of the 802.16 standard approved in 2004
In countries with good telecommunications infrastructure, mobile access to voice and data
Based on the e amendment of the 802.16 standard approved in 2005
Offers a variety of wireless equipment for different applications.
Originally proprietary equipment, but now WiMAX approved.
In Merida, in 2002, a link was installed from a station that collects atmospheric data located at 4765 m altitude, to the Universidad de Los Andes, located at an altitude of 1800 m, and at a distance of 15 km.
A webcam transmits images of Pico Bolivar (5000 m) and other data in real time:
Receiver for the 270 GHz signal. Note the quality of the antenna reflector and the use of liquid nitrogen to reduce the receiver's noise temperature. Alejandro Humboldt Station, Pico Espejo, Merida State, Venezuela. http://www.cecalc.ula.ve/redbc/estaciones/estacion_pico_espejo_mars.html
There are two versions of WiMAX, one for fixed clients, based on IEEE 802.16-2004 (802.16d) and another for mobile clients, based on IEEE 802.16-2005 (802.16e)
While WiMAX has many technical advantages with respect to WiFi, the latter continues progressing and filling many of the gaps in the original standard and, at the same time, maintaining a significant economic advantage
The five main points that you must remember in this unit can be summarised as:
4. WiFi is more amenable to organisations that want to install their own infrastructure, while WiMAX is usually installed by a big operator
5. Although there are commercial solutions for wireless networks that may be the most suitable in some cases, it is generally preferable to use standard solutions with better guarantees of continuing support