John;
John Scrivner wrote:
I personally wish all manufacturers would standardize on a GPS sync
system to allow for multiple reuse of frequencies. This is one place
where Motorola definitely has the right idea. I have never seen a
convincing argument for any reason why GPS sync is not a great thing
for reuse of spectrum and I feel it should be encouraged by us to
standards bodies who are designing the future generations of
unlicensed radio platforms. Is there a downside to GPS sync?
Scriv
You have never seen a compelling argument because there is not one.
Motorola definitely goes in the right direction here. Why? Because a
good TDM system can be designed to use the entire band *and* share that
entire band with any other operator in the area. Nobody does this at
this time but lets do a "what if"...
What if there was a band like 900 (902-928) and it could be modulated as
WiFi modulates 2.4 and it was TDM like Moto. Total band capacity would
be about 54 MBits/Sec maybe a bit more. Now if it was GPS based TDM
the AP radios could negotiate time slots such that the larger ISP would
get more band width than the smaller ISP, separate encryption keys would
allow these two users of the band to share it without being able to
violate each other's network integrity. Ooopppsss! A new operator
enters the TDM network and guess what, he gets what he needs. The APs
negotiate that. The problem is when the spectrum is truly full. A new
guy takes from everyone.
Such a system is easily within the existing expertise envelope.
I am with you, TDM simply rocks for it's spectral efficiency. There are
complications but those are engineering complications. I'll touch them
because they are an interesting problem. First RF travels at the
speed of light and when everyone is on the GPS clock and the same
frequency they also need to know *where* everyone else is to efficiently
allocate time slots so the APs on different networks have to
communicate and negotiate bandwidth allocation. That would have to be
done based upon need. The AP would have to discuss it's needed spectrum
with other APs who are also using the same spectrum and there would have
to be some consensus generated in the geographic space which would
fairly allocate time slots.
It can be done. It would be fair and it would work quite well. I would
very much like to see something like this done in 700 MHz because the
big players would absolutely *HATE* it for it's fairness to the small
players.
-m-
Mike Hammett wrote:
How difficult is it to engineer sectors with greater isolation? With
only 50 MHz, we're going to have to become champions of spectrum reuse.
-----
Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com
----- Original Message ----- From: "Marlon K. Schafer (509) 982-2181"
<[EMAIL PROTECTED]>
To: "Principal WISPA Member List" <[EMAIL PROTECTED]>
Cc: <[email protected]>
Sent: Thursday, June 07, 2007 1:00 PM
Subject: [WISPA] Fw: [WISPA FCC] FCC 3650 band response today..
Getting closer to a 3650 reality!
Marlon
(509) 982-2181 (408) 907-6910
(Vonage) Consulting services
42846865 (icq) WISP Operator
since 1999!
[EMAIL PROTECTED]
www.odessaoffice.com/wireless
www.odessaoffice.com/marlon/cam
----- Original Message ----- From: "Dan Lubar"
<[EMAIL PROTECTED]>
To: "FCC Discussion" <[EMAIL PROTECTED]>
Sent: Thursday, June 07, 2007 9:54 AM
Subject: [WISPA FCC] FCC 3650 band response today..
Greetings everyone..
I wanted to make everyone aware of today's published response from the
FCC regarding the reconsideration of its 3650 NPRM..
http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-07-99A1.pdf
Note that the petitions for reconsideration of this rule making have
been denied and 3650 band usage in the United States is now one step
closer.
Respectfully,
Dan Lubar
RelayServices
_______________________________________________
FCC mailing list
[EMAIL PROTECTED]
http://lists.wispa.org/mailman/listinfo/fcc
--
WISPA Wireless List: [email protected]
Subscribe/Unsubscribe:
http://lists.wispa.org/mailman/listinfo/wireless
Archives: http://lists.wispa.org/pipermail/wireless/
--
WISPA Wireless List: [email protected]
Subscribe/Unsubscribe:
http://lists.wispa.org/mailman/listinfo/wireless
Archives: http://lists.wispa.org/pipermail/wireless/
