multiple phy with osmo-trx

[Max]

Hi.

Unfortunately I'm unable to make it work yet:

sudo chrt 20 ./Transceiver52M/osmo-trx -m -c 2 -g

linux; GNU C++ version 4.8.2; Boost_105400; UHD_003.008.004-0-unknown

opening configuration table from path :memory:
Config Settings
   Log Level............... NOTICE
   Device args.............
   TRX Base Port........... 5700
   TRX Address............. 127.0.0.1
   Channels................ 2
   Tx Samples-per-Symbol... 4
   Rx Samples-per-Symbol... 4
   EDGE support............ Disabled
   Reference............... GPS
   C0 Filler Table......... Disabled
   Multi-Carrier........... Enabled
   Diversity............... Disabled
   Tuning offset........... 0
   RSSI to dBm offset...... 0
   Swap channels........... 0

-- Operating over USB 2.
-- Initialize CODEC control...
-- Initialize Radio control...
-- Performing register loopback test... pass
-- Performing register loopback test... pass
-- Performing CODEC loopback test... pass
-- Performing CODEC loopback test... pass
-- Asking for clock rate 32.000000 MHz
-- Actually got clock rate 32.000000 MHz
-- Performing timer loopback test... pass
-- Performing timer loopback test... pass
-- Asking for clock rate 3.200000 MHz
UHD Warning:
    The requested master_clock_rate 3.200000 MHz exceeds bounds imposed
by UHD.
    The master_clock_rate has been forced to 5.000000 MHz.
-- Actually got clock rate 5.000000 MHz
-- Performing timer loopback test... pass
-- Performing timer loopback test... pass
ALERT 3036182272 15:41:43.1 UHDDevice.cpp:546:set_master_clk: Failed to
set master clock rate
ALERT 3036182272 15:41:43.1 UHDDevice.cpp:546:set_master_clk: Failed to
set master clock rate
ALERT 3036182272 15:41:43.1 UHDDevice.cpp:547:set_master_clk: Requested
clock rate 3.2e+06
ALERT 3036182272 15:41:43.1 UHDDevice.cpp:547:set_master_clk: Requested
clock rate 3.2e+06
ALERT 3036182272 15:41:43.1 UHDDevice.cpp:548:set_master_clk: Actual
clock rate 5e+06
ALERT 3036182272 15:41:43.1 UHDDevice.cpp:548:set_master_clk: Actual
clock rate 5e+06
ALERT 3036182272 15:41:43.1 osmo-trx.cpp:530:main: Failed to create
radio device

ALERT 3036182272 15:41:43.1 osmo-trx.cpp:530:main: Failed to create
radio device
Shutting down transceiver...


On 08/02/2016 12:39 AM, Tom Tsou wrote:
> Hi Max,
>
> On Mon, Aug 1, 2016 at 7:57 AM, Max <msuraev at 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

-- 
Max Suraev <msuraev at sysmocom.de> http://www.sysmocom.de/
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