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(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
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