Hi Max,
On Mon, Aug 1, 2016 at 7:57 AM, Max msuraev@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