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What is WiMAX

x-pert

x-pert

Member
Jun 13, 2006
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WiMAX: Worldwide Interoperability for Microwave Access (Axcess) ;)


There are several kinds of wireless networking technologies.

WPAN - Wireless Personal Area Network
WLAN - Wireless Local Area Network
WMAN - Wireless Metropilitan Area Network
WWAN - Wireless Wide Area Network


WPAN
ZigBee: 40 - 100m range
Bluetooth: 10 - 30m range
WUSB: ~10m range

WLAN
Normally 30 - 100m range covered
802.11b standard: WiFi, 11Mbps
802.11a/g: 54Mbps
802.11i: Security standard with hardware encryption coprocessor
802.11e: Quality of Service control for VoIP

WWAN
Two main families:
Time Division Multiple Access (GSM and GPRS)
Code Division Multiple Access - CDMA


WMAN

WiMAX is a wireless metropolitan area network standard:

2 - 6 GHz licenced bands
Up to 50km range
70Mbps per client, 150 - 620Mbps per wireless access point
IEEE standards 802.16X and 802.20



Source: De Silva, D and Peterson, S., Wireless Telecommunications Security: A new paradigm, Sept2007, ACS.
 
Last edited:
x-pert

x-pert

Member
Jun 13, 2006
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0
tckrockz said:
elaz macho :D bt what r the advantages n disadvantages ??
Click to expand...

Ithin machang advantages thamai WiMAX wala range and speed eka...
Disadvantage eka wenne, speed and range kiyana dekama eka paara wenne naha. :) When you reach 50kms the speed will get reduced.

More:

Comparison with Wi-Fi

Possibly due to the fact both WiMAX and Wi-Fi begin with the same two letters, are based upon IEEE standards beginning with "802.", and both have a connection to wireless connectivity and the Internet, comparisons and confusion between the two are frequent. Despite this, the two standards are aimed at different applications.

WiMAX is a long-range system, covering many kilometers that typically uses licensed spectrum (although it is also possible to use unlicensed spectrum) to deliver a point-to-point connection to the Internet from an ISP to an end user. Different 802.16 standards provide different types of access, from mobile (analogous to access via a cellphone) to fixed (an alternative to wired access, where the end user's wireless termination point is fixed in location.)
Wi-Fi is a shorter range system, typically hundreds of meters, that uses unlicensed spectrum to provide access to a network, typically covering only the network operator's own property. Typically Wi-Fi is used by an end user to access their own network, which may or may not be connected to the Internet. If WiMAX provides services analogous to a cellphone, Wi-Fi is more analogous to a cordless phone.

WiMAX and Wi-Fi have quite different Quality of Service (QoS) mechanisms. WiMAX uses a mechanism based on setting up connections between the Base Station and the user device. Each connection is based on specific scheduling algorithms, which means that QoS parameters can be guaranteed for each flow. WiFi has introduced a QoS mechanism similar to fixed Ethernet, where packets can receive different priorities based on their tags. This means that QoS is relative between packets/flows, as opposed to guaranteed.

WiMAX is highly scalable from what are called "femto"-scale remote stations to multi-sector 'maxi' scale base that handle complex tasks of management and mobile handoff functions and include MIMO-AAS smart antenna subsystems.
Due to the ease and low cost with which Wi-Fi can be deployed, it is sometimes used to provide Internet access to third parties within a single room or building available to the provider, often informally, and sometimes as part of a business relationship. For example, many coffee shops, hotels, and transportation hubs contain Wi-Fi access points providing access to the Internet for customers.
Click to expand...

http://en.wikipedia.org/wiki/Wimax

http://www.wimaxforum.org/home/

http://ieee802.org/16/
 

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