[srslte-users] How to configure srsUE multi radios?

[Xavier Arteaga]

Hi,
First of all, the number of radios > 1 is meant to be for Carrier
Aggregation. The srsenb does not support CA at the moment. Why do you want
to use multiple radios in the srsue? Are you able to attach if you set it
to one radio?

Second, the preambles the srsenb are getting in the logs you sent do not
match the ones transmitted by the UE. Either there is a power issue (too
high or too low), time alignment (negative) or CFO.

For the power issue, tweak srsenb rx gain.

For time issue, tweak time_adv_nsamples.

You could try running pdsch_ue example for checking the CFO value:
sudo lib/examples/pdsch_ue -f 2685.0e6 -F

Regards,
Xavier

On Mon, 23 Sep 2019 at 12:36, 林原進 <applegam80 at gmail.com> wrote:

> Hello,
> I want to use two usrp B210 boards to connect srsenb.
> In the default ue.conf [rf] part,I add new line "nof_radios =2".
> In the default enb.conf [enb] part,I edit two lines "tm=2" and "nof_ports
> =2".
> In the srsUE terminal, it shows:
> ###
> ...
>  Searching cell in DL EARFCN=3400, f_dl=2685.0 MHz, f_ul=2565.0 MHz
> .
> Found Cell:  Mode=FDD, PCI=1, PRB=50, Ports=2, CFO=-1.2 KHz
> Found PLMN:  Id=00101, TAC=7
> Random Access Transmission: seq=30, ra-rnti=0x2
> Random Access Transmission: seq=7, ra-rnti=0x2
> Random Access Transmission: seq=36, ra-rnti=0x2
> Random Access Transmission: seq=7, ra-rnti=0x2
> Random Access Transmission: seq=17, ra-rnti=0x2
> Random Access Transmission: seq=23, ra-rnti=0x2
> Random Access Transmission: seq=40, ra-rnti=0x2
> Random Access Transmission: seq=39, ra-rnti=0x2
> Random Access Transmission: seq=1, ra-rnti=0x2
> Random Access Transmission: seq=8, ra-rnti=0x2
> Warning: Detected Radio-Link Failure
> ###
> Reapting random access and warning message.
>
> In the srsenb terminal, it shows:
> ###
> Type <t> to review trace
> RACH:  tti:9151, preamble=20, offset=8, temp_crnti=0x46
> RACH:  tti:9151, premable=23, offset=8, temp_crnti=0x47
> SCHED: Could not transmit RAR within the window (RA TTI=9151, Window=10,
> Now=9168)
> RACH:  tti:9231, preamble=7, offset=8, temp_crnti=0x48
> Disconnecting rnti=0x46
> Disconnecting rnti=0x47
> ###
> I am new to srsLTE.
> Anyone can help me?
>
> Thanks!
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