[srslte-users] Tests on the same USRP

[Nadia Patricia Yoza Mitsuishi]

Hi Neel,

Thanks for your helpful response!

I tried to see where I can specify the channel number (0 or 1) and I
haven't found that option in either the enb.conf or ue.conf files. Do I
need to modify the .cc files for that? I downloaded the srsRAN master
branch.

I found the following and it looks like it is trying to set up the
tx_subdev_spec and rx_subdev_spec. Is this the correct file to use for this
purpose?
https://gitlab.modalai.com/srs-opensource/srsLTE/blob/master/lib/src/phy/rf/rf_uhd_imp.c

If you have any advice, please let me know.

Thank you,

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On Mon, Aug 23, 2021 at 1:00 PM Neel Pandeya <neel.pandeya at ettus.com> wrote:

> Hello Nadia Patricia Yoza Mitsuishi:
>
> The default transmit antenna is TX/RX and the default receive antenna is
> RX2, so all you should have to do is specify the channel number, either "0"
> or "1", for the uplink and downlink to operate between the two channels of
> the USRP B210.
>
> However, there is a more fundamental issue.  A single USRP device can only
> be controlled by one UHD session (one UHD process) at a time.  So, you
> could not have both srsENB and srsUE using the same USRP B210 board
> simulateanously.
>
> --Neel Pandeya
>
>
>
> On Mon, 23 Aug 2021 at 11:33, Nadia Patricia Yoza Mitsuishi <
> Nadia.YozaMitsuishi at colorado.edu> wrote:
>
>> Hello everyone,
>>
>> I am a new srsRAN user. Can srsRAN allow a USRP B210 to do RF throughput
>> loopback test (on a single USRP unit)? Can eNB and UE run on the same USRP
>> at the same time?
>>
>> Right now, srsRAN only allows B210 to use TX/RX and RX2 ports on the same
>> channel (channel A), but does not allow access to channel B. My planned RF
>> loopback test shall access TX/RX port of channel A and RX2 port of channel
>> B. I could not find any way to enable this from the configuration files.
>>
>> Any suggestions on how to achieve the above?
>>
>> Thank you
>>
>>
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