Wi-Fi products are used to build
WLANs, while WiMAX products are used to build WMANs.
A Wireless Local Area Network (WLAN)
is a group of devices linked together by wireless within a relatively small
space like a single office building or home. Three WLAN technologies were
included in the original 802.11
standard: Infrared,
Frequency Hopping Spread Spectrum (FHSS),
and Direct Sequence Spread Spectrum (DSSS).
802.11b focused exclusively on DSSS; 802.11a/g/n also used Orthogonal Frequency
Division Multiplexing (OFDM).
Wi-Fi is a certification applied
to 802.11a/b/g/n products tested by the Wi-Fi Alliance, an industry consortium that
promotes interoperability in heterogeneous WLANs. For example, all 802.11g
products implement standard OFDM and DSSS, but only Wi-Fi
certified products have proven that they correctly support a mandatory subset
of features and options.
To create a WLAN, enterprises,
small businesses, and home owners can purchase Wi-Fi certified Access Points (APs)
and clients (laptops, phones, printers). Clients must be no more than a few
hundred feet from the closest AP. Larger buildings can be covered by installing
multiple APs that are connected to each other. Most WLANs are deployed indoors,
but WLANs can also cover parking lots or courtyards or other local outdoor
areas.
Wireless Metropolitan Area
Networks (WMANs)
use wireless "last mile" technologies to connect subscriber stations
(customer premise equipment) to base stations (carrier network infrastructure),
providing a wireless alternative to wireline Internet access technologies like
DSL, cable, or fiber.
802.16
standards define several WMAN technologies that operate at various frequencies,
distances, and speeds to deliver Broadband Wireless Access (BWA). The original
802.16 focused on Fixed BWA, using point to point wireless uplinks to connect
subscriber networks to carrier networks and the Internet. More recently, the
802.16e amendment defined Mobile BWA to serve subscriber stations that are not
fixed in place, like laptops used in cars and trains.
WiMax is a certification applied
to 802.16 products tested by the WiMAX Forum. Carriers build and operate WMANs
by purchasing licensed spectrum and then deploying WiMAX base
stations throughout a city, region, or other designated coverage area. To use
the WMAN, subscribers must purchase wireless services from a carrier. For
example, Sprint recently launched a commercial WiMAX service called XOHM in
Baltimore. Consumers in and around Baltimore that want to use XOHM must
purchase a compatible WiMAX device and pay Sprint for air time.
Here are some key differences
between WLANs and WMANs, supported by Wi-Fi and WiMAX products:
1
It's possible to use WMAN technology indoors,
but 802.16 protocols are optimized for outdoor operation. It's possible to use
WLAN technology outside, but 802.11 protocols were primarily designed for
indoor networks.
•
Larger WLANs can be constructed using many
densely-spaced Wi-Fi APs, but to blanket miles of territory with wireless, you
really want to create a WMAN technology. On the other hand, using WiMAX
products for communication between PCs inside the same building would be pricey
and impractical -- that's precisely what WLAN technologies were created for.
•
Most office and home WLANs are composed of Wi-Fi
products operating in unlicensed spectrum -- channels freely available for use
by anyone. WiMAX products most often operate in spectrum licensed to wireless
carriers who use them to deliver commercial BWA services.
The bottom line is that WLANs and
WMANs are complementary network architectures, supported by standard
technologies that were designed for very different environments and purposes.
This is why your next laptop may well include both Wi-Fi and Mobile WiMAX adapters.
Use the Wi-Fi adapter to connect to your office or home WLAN free-of-charge,
but use the WiMAX adapter when you're on the go to reach the Internet through a
carrier's WMAN.
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