Everybody who
has been working on TVWS in IEEE 802 should read this, the source document, and
the related material.
From
FierceBroadbandWireless:
-------------------------------------------
Microsoft claims new protocol fixes interference problem
for white-space devices
|
By Lynnette Luna |
Researchers from Microsoft and Harvard University say they have developed a
protocol that could be the foundation for new white-space devices.
The researchers believe the protocol could enable devices to avoid
interference in white-space spectrum--those unused slivers of spectrum in the
700 MHz band between spectrum used by broadcast TV stations. The FCC
approved the use of white-space devices last November on the condition
that they don't interfere with nearby services, such as broadcast TV and
wireless microphones. White-space devices are supposed to undergo a rigorous
certification process before it is authorized. The vision for white space is to
create super WiFi technology. The broadcasting industry has vigorously
opposed any use of white-space devices, citing interference concerns. It hasn't
been satisfied with the FCC's conclusion that interference won't be a major
problem.
Microsoft and Harvard researchers presented their ideas this week at
the ACM SIGCOMM 2009, a communications conference held in Barcelona, Spain,
according to an article published on MIT's Technology
Review Web site. The set of protocols are called
"White-Fi," which are designed to avoid interference and make
efficient use of the white-space spectrum since much of the interference has to
do with devices using the same frequency at the same time. The protocol enables
each device to evaluate the spectrum around it, discover available frequencies
and continually search for interference, the researchers said. Once the
interference is found, the protocol enables the device to jump to a different
piece of spectrum at any time.
Microsoft recently obtained an experimental license from the FCC to build a
prototype White-Fi system on the Microsoft Research Campus in Redmond, Wash.,
Microsoft researcher Ranveer Chandra told Technology
Review. Microsoft plans to share its findings with the FCC.
For more:
- read Cnet
Related articles:
White
space: Dell to make laptops; Google downright giddy
FCC unanimously approves
unlicensed white-space devices
Microsoft
intensifies white-space lobbying efforts
Read more about: WiFi,
White-Fi,
white
space, protocol
Richard Paine
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