The NTIA only allows the use of the 1710 to 1720 MHz band that I now
have in CMA401 to be used with a max EIRP for the system (radio plus
antenna) of 1 watt and a max height above average terrain of 30 feet.
Their is NO practical use of 1710 to 1720 MHz as a tower base station
frequency, period. It can ONLY be used at client ends. The base station
end has to be in the 2110 to 2120 MHz band which can transmit at
hundreds of watts EIRP. These unbalanced power levels may make this look
like a dead deal for 1710 to 1720 for any use but remember that all PCS
client radios (cell phones) operate at far below 1 watt EIRP. AWS can
work as a broadband platform but only as a FDD based system. It also
probably means that a different modulation scheme will be required for
the client to base path because of the skewed power levels which
probably means assymetrical bandwidth offerings.
I can live with that if it means I can serve everyone inside a given
geography without running signal tests all the time. I want to sell
customers a card or a phone or a PDA and be done with it. That is the
whole reason to do this kind of a deal. Truck rolls are killing this
industry from my perspective. We need to build networks that just work
everyplace without having to do installations at every single customer
location. That is the dream I am hoping to experience. I'll let you know
how well that works out after a few million in Capex and a few years
getting it all built. Wish me luck. I'll need it. :-)
Scriv
Matt Liotta wrote:
I wouldn't think you would be required to use FDD. 802.16e supports
varying channel widths, so you could for example deploy a multi-point
system with two 10Mhz channels or six 3Mhz channels all TDD.
-Matt
John Scrivner wrote:
Tom DeReggi wrote:
Scriv,Congrads on the spectrum win.
Thank you.
What are you doing about equipment to operate in that spectrum range?
That is the $100,000 question right now. 802.16e for mobility and
fixed wireless is designed strictly for TDD use. I have paired
frequencies which are generally relegated to some type of FDD system
like those used in the cellular industry. There are some next gen
choices in that area that I am looking at. I personally believe
someone will adapt 802.16e to work in FDD whether it is standards
compliant or not. Then I will likely choose that. I could use 802.16d
gear like BreezeMax but I really want to offer mobility as well as
fixed which is not an option with 802.16d. Nortel is working on me
pretty hard right now. We'll see where this goes. It is going to be a
while before I can get the incumbent users of my bands relocated so I
have some time to ponder.
Scriv
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
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