[srsran-users] UE can't use band 20 in 5G SA mode

[Andre Puschmann]

Hi Seonwoo,

On 6/6/22 16:00, Seonwoo Lee wrote:
> Hi everyone. I'm trying to use the latest srsRAN release that supports 
> 5G in SA mode. I've been following the guide at 
> https://docs.srsran.com/en/latest/app_notes/source/5g_sa_E2E/source/index.html 
> <https://docs.srsran.com/en/latest/app_notes/source/5g_sa_E2E/source/index.html>. 
> I want to use band 20, and I have been successful in tuning the gNB to 
> band 20 by changing the rr.conf. But when I try to tell the UE to band 
> 20, it just ignores it, and uses the default band 3 instead. I've got 
> the following in ue.conf:
> 
> [rat.eutra]
> dl_earfcn = 2850
> nof_carriers = 0
> [rat.nr <http://rat.nr>]
> bands = 20
> nof_carriers = 1
> 
> Does anybody know why the UE ignores the band specified?

You do have to specify the band as well as the DL ARFCN and the SSB 
ARFCN. Otherwise it defaults to the values in [1].

For band 20, for example, use:

[rat.nr]
nof_carriers = 1
bands = 20
dl_nr_arfcn = 159000
ssb_nr_arfcn = 158910

Hope that helps!

Best
Andre

[1] 
https://github.com/srsran/srsRAN/blob/f2dff0b7a03e065060b48ea0a3c7a6a7890dfd46/srsue/src/main.cc#L139


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-- 
Andre Puschmann

Software Radio Systems (SRS)
https://www.srs.io
andre at srs.io

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