Ivan,
If you would
like to prepare something on Spectrum Server for the July plenary that would be
fine. I believe this idea is also along the lines of what other groups
(1900.4) are thinking. So it would be good to have a discussion on this topic.
Steve
From: Ivan Reede
[mailto:i_reede@xxxxxxxxxxxx]
Sent: Wednesday, May 27, 2009 4:50 AM
To: Shellhammer, Steve
Cc: STDS-802-19@xxxxxxxxxxxxxxxxx
Subject: Re: [802.19] TVWS Coexistence
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....
============================================================
-----
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