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Harald Welte laforge at gnumonks.orgHi Peter and others,
it seems like the situation regarding the GSM network at the Camp is
starting to become clearer every day.
I am still arguing that two relatively large BTS with circular antennas
are a good idea. Therefore, I have now applied for a test license with
the regulatory authority with the following parameters:
* six GSM 1800 ARFCN
* two antennas, circular, 18 meters above ground
* 5W output power on each ARFCN. I know one of my customers in Germany
has once managed to get a license for 5W, so I thought it is a good
bet we should get the same. It should be more than sufficient to
cover the camp.
* from August 2nd through August 15th, i.e. we have time for build-up
and can also run it one more day during shutdown of the camp
I should be receiving "Motorola Horizon Macro" BTSs with 3 to 6 TRX each
soon. They are able to drive something like >= 20W output power, way
more than we need. The only problem with those BTS is: We will need to
add the Motorola A-bis dialect to OpenBSC before the Camp, which could
be a tough task depending on how far they are off the standard A-bis
as specified in 08.58 and 12.21.
If we cannot make those BTS work, our options are somewhat limited.
1) nanoBTS based
The nanoBTS are 200mW only, so we would need a booster. Those cost
about 1000 EUR for 6W downlink power + 18dB uplink LNA. Who is going
to fund that? Also, we would need a combiner/splitter to run
something like a 3-TRX setup.
2) Ericsson RBS
I should have two RBS 2308 (4TRX each) soon, but both of them are GSM
1900. It is unlikely that we ge a license, and a lot of phones probably
don't support it. So unless they can somehow be converted to 1800
MHz units, they are not a good fit either :/
3) Siemens BS-11
All of them are GSM 900. No way to get a license in Germany, sorry.
So we basically _have to_ make the Motorola Horizon work...
Regards,
Harald
--
- Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/
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