Hi Max,
On Mon, Aug 1, 2016 at 7:57 AM, Max <msuraev(a)sysmocom.de> wrote:
I've asked about it before but this seems to have
been lost in
communication.
I do not recall this discussion. My apologies.
The question is basically how to enable multi-TRX
support for
osmo-bts-trx using phy/instance infrastructure similar to other bts?
I use the following configuration.
phy 0
instance 0
instance 1
osmotrx rx-gain 25
bts 0
band 900
ipa unit-id 1234 0
oml remote-ip 127.0.0.1
settsc
gsmtap-sapi ccch
gsmtap-sapi pdtch
trx 0
phy 0 instance 0
trx 1
phy 0 instance 1
$ osmo-bts-trx -c osmo-bts.cfg -t 2
In short, I'd like to configure OpenBSC with 1 BTS
with 2 TRX, each with
its own arfcn and set of channels. I'm running "osmo-bts-trx -t 2" and
correspondingly "osmo-trx -c 2" on usrp b210. Any ideas on what's
missing to make this actually work are greatly appreciated.
You can use "osmo-trx -c 2" or "osmo-trx -m -c 2" to use
dual-channels
of the B210 or multi-ARFCN on one channel respectively.
Note that there are ARFCN restrictions for both cases. Due to a shared
local oscillator for both B210 channels, ARFCN separation can be up
about 25 MHz.
With multi-TRX, ARFCN spacing is fixed at 800 kHz or 4 GSM channels.
So if TRX-0 is set to ARFCN 51, TRX-1 _must_ be set to 55. Up to three
ARFCN's is supported for multi-TRX.
-TT