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Incorrect Steve. I think coordination between white
space devices is very important... I think it should be paramount to 802.19 as
this is a definate macro scale coexistence mechanism.
The Geographic Electromagnetic Radiation Control
System "GERDCS" is a database that actually does exactly what Mark points out, a
database engine that gives environmental data and a resolver system that
computes the optimal usage of the spectrum in the local RF environment to
optimise spectrum usage. (Same structure as the well known and
proven DNS system). It actually looks at spectrum usage amongst registered
users and specifes the maximum power for each channel a transmitter may use in
an area before coexistence problems start occuring. It can firther coordinate
between dis-similar and potenitally unfriendly systems in a anonymous fashion to
enhance coexistence. Anonyminity is required to protect civil rights of
subsribers (i.e location of their transimtters) in some countries. That is why
GERDCS does not relinquish transmitter locations but rather works with "areas of
interest" which blurs the actuial location of a specific transmitter and even
allows many tranmsitters in an area to share the area under the control of the
resolver. The resolver can get the actual data because it can be operated by the
network owner who does have right to the location of his transmitters.
802.18 has acknoledged this need, stating to the
FCC (in it's most recent response to the FCC R&O) that 802 beleives that
database engines and resolvers are required. This response was then
endorsed at the EC level to be forwarded as the "802 position to the
FCC.
To the best of my knowledge, 802.22 is working on
the premise the "database" system (I consider as a collection of databases and
resolvers) will give these power level parameters for each channel.
If you wish, I could prepare a presentation on this
topic for the July meeting. I beleive it is very germain to 802.19 to study how
a database could be used at a macro-scale level to enhance
coexistence.
Just my 2 cents worth....
Ivan Reede
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----- Original Message -----
Sent: Tuesday, May 26, 2009 11:59
PM
Subject: [802.19] TVWS Coexistence
All,
I was speaking with Mark Cummings today and he pointed out an issue that got
brought up at the Wireless Interim.
It seems that when we were discussing the coexistence matrix it was mentioned
that the TV white space database would somehow coordinate spectrum usage
between TV white space devices. It is my understanding of the FCC
R&O that the database will provide a list of channels unused by incumbent
systems in that location, but will not act as a spectrum server telling TV
white space devices which channels they can use. It is my understanding
that the incumbent database is for the function of protecting incumbent
services and not coordinating coexistence between TV white space
devices.
If anyone has any comments or feedback they are welcome.
Steve
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