Comments (5)
ismagom
commented on August 27, 2024
Thanks for reporting.
This is a known issue (#93) and will be fixed in the following days
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brendan-mcauliffe
commented on August 27, 2024
Hi @polhenarejos the latest version of srsUE is now available, it contains a fix for this issue.
I suggest you update both srsRAN 4G and srsRAN Project now. There is also now a sample configuration file that ships with srsRAN Project that will work with srsUE.
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polhenarejos
commented on August 27, 2024
I updated both srsRAN 4G and srsRAN Project with commit id 64be27895 (ue) and 133e71a (gnb) but the problem still persists. However, this time the log is different:
2023-06-19T14:51:09.575241 [GNB ] [W] Could not check DRM KMS polling. filename=/sys/module/drm_kms_helper/parameters/poll error="No such file or directory"
2023-06-19T14:51:13.472175 [FAPI ] [W] [ 0.0] Real-time failure in FAPI: Received late DL_TTI.request. Current slot is 217.2 while message corresponds to 217.1
2023-06-19T14:51:13.472181 [FAPI ] [W] [ 0.0] Real-time failure in FAPI: Received UL_TTI.request message out of time. Current slot is 217.2 while message corresponds to 217.1
2023-06-19T14:51:20.057267 [UL-PHY0 ] [D] [ 865.4] PRACH: rssi=+32.8dB detected_preambles=[{idx=0 ta=-10.94us power=+120.1dB snr=0.0dB}] t=361.9us
rsi=1
preambles=[0, 64)
format=0
set=unrestricted
zcz=0
rssi=+32.8dB
res=0.5us
max_ta=103.12us
detected_preambles=[{idx=0 ta=-10.94us power=+120.1dB snr=0.0dB}]
2023-06-19T14:51:20.057270 [FAPI ] [W] [ 0.0] All detected PRACH preambles have a negative TA value in slot=865.4, no PRACH.ind message will be generated
2023-06-19T14:51:20.217352 [UL-PHY0 ] [D] [ 881.4] PRACH: rssi=+22.9dB detected_preambles=[{idx=0 ta=-10.94us power=+110.2dB snr=0.0dB}] t=337.1us
rsi=1
preambles=[0, 64)
format=0
set=unrestricted
zcz=0
rssi=+22.9dB
res=0.5us
max_ta=103.12us
detected_preambles=[{idx=0 ta=-10.94us power=+110.2dB snr=0.0dB}]
2023-06-19T14:51:20.217352 [FAPI ] [W] [ 0.0] All detected PRACH preambles have a negative TA value in slot=881.4, no PRACH.ind message will be generated
2023-06-19T14:51:20.377279 [UL-PHY0 ] [D] [ 897.4] PRACH: rssi=+22.9dB detected_preambles=[{idx=0 ta=-10.94us power=+110.2dB snr=0.0dB}] t=338.1us
rsi=1
preambles=[0, 64)
format=0
set=unrestricted
zcz=0
rssi=+22.9dB
res=0.5us
max_ta=103.12us
detected_preambles=[{idx=0 ta=-10.94us power=+110.2dB snr=0.0dB}]
...
It seems that something is 1 subframe time-misaligned. In the failing setup there is the warning message Real-time failure in FAPI: Received late DL_TTI.request., which is not present in the working setup. Is it related?
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ismagom
commented on August 27, 2024
Hi @polhenarejos ,
I think I was wrong and your issue is different than #93.
I think your original issue is an incorrect TX/RX calibration in the USRP.
Looking at your gnb_ok.log:
2023-06-14T10:51:15.106681 [UL-PHY0 ] [D] [ 689.4] PRACH: rssi=+38.0dB detected_preambles=[{idx=0 ta=-10.94us power=+124.8dB snr=0.0dB}] t=359.6us
it seems the PRACH came too early. The gnb returned TA=0, but that makes the following PUCCH/PUSCH signal arrive early too. You could establish a connection, but the UL SNR was very low. With the later version, we added a check to avoid that, see in your gnb_ko.log you have the same PRACH reception but now with a warning message:
2023-06-14T10:58:59.678394 [UL-PHY0 ] [D] [ 849.4] PRACH: rssi=+38.0dB detected_preambles=[{idx=0 ta=-10.94us power=+125.5dB snr=0.0dB}] t=359.0us
rsi=1
preambles=[0, 64)
format=0
set=unrestricted
zcz=0
rssi=+38.0dB
res=0.5us
max_ta=103.12us
detected_preambles=[{idx=0 ta=-10.94us power=+125.5dB snr=0.0dB}]
2023-06-14T10:58:59.678395 [FAPI ] [W] [ 0.0] All detected PRACH preambles have a negative TA value in slot=849.4, no PRACH.ind message will be generated
The solution to this problem is to calibrate the time_alignment_calibration as indicated here.
Hope that helps.
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polhenarejos
commented on August 27, 2024
Hi @ismagom
It did the trick. I am using a delay of -127 samples and it works as before.
BTW, I still get the warning message about FAPI. Do you think it might introduce additional errors on higher layers?
Many thanks.
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