Comments (5)
andrepuschmann
commented on July 24, 2024
Hey, the UE has an underflow, loses sync and fails to recover from it. It should be able to recover from that but somehow the RF is in a weird state after losing samples.
I see you're using a recent UHD version on the UE - could you perhaps try to revert back to UHD 3.15 (only UE) and see if the behavior after loosing samples is better? I spot this in the logs 2023-05-31T14:39:07.201070 [RF ] [I] Detected RF gap of -10000.0 us. Sending end-of-burst. and I know that EOB handling has changed from version to version a bit.
See logs:
2023-05-31T14:39:07.145821 [PHY0-NR] [I] [ 4795] PUCCH: cc=0, f=2 prb=2:1 symb=12:2 rnti=0x4601 cqi=15 sr=0 , tti_tx=4799
2023-05-31T14:39:07.190769 [PHY-SA ] [E] [ 4840] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.191766 [PHY-SA ] [E] [ 4840] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.192898 [PHY-SA ] [E] [ 4840] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.193731 [PHY-SA ] [E] [ 4840] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.194823 [PHY-SA ] [E] [ 4840] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.195839 [PHY-SA ] [E] [ 4840] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.196780 [PHY-SA ] [E] [ 4840] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.197831 [PHY-SA ] [E] [ 4840] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.198886 [PHY-SA ] [E] [ 4840] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.199782 [PHY-SA ] [E] [ 4840] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.200897 [PHY0-NR] [E] [ 4840] PBCH-MIB: NR SFN (485) does not match current SFN (484)
2023-05-31T14:39:07.201070 [RF ] [I] Detected RF gap of -10000.0 us. Sending end-of-burst.
2023-05-31T14:39:07.210685 [PHY0-NR] [E] [ 4850] PBCH-MIB: NR SFN (486) does not match current SFN (485)
2023-05-31T14:39:07.220780 [PHY0-NR] [E] [ 4860] PBCH-MIB: NR SFN (487) does not match current SFN (486)
2023-05-31T14:39:07.230687 [PHY0-NR] [E] [ 4870] PBCH-MIB: NR SFN (488) does not match current SFN (487)
2023-05-31T14:39:07.235734 [MAC ] [I] [ 4885] BSR: triggered_bsr_type=none, LCID QUEUE status: 0: 0 1: 0
2023-05-31T14:39:07.236094 [PHY1-NR] [I] [ 4875] PUCCH: cc=0, f=2 prb=2:1 symb=12:2 rnti=0x4601 cqi=15 sr=0 , tti_tx=4879
2023-05-31T14:39:07.238780 [RF ] [I] Underflow
2023-05-31T14:39:07.240709 [PHY-SA ] [E] [ 4880] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.241946 [PHY-SA ] [E] [ 4880] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.242817 [PHY-SA ] [E] [ 4880] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.243900 [PHY-SA ] [E] [ 4880] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.244949 [PHY-SA ] [E] [ 4880] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.245827 [PHY-SA ] [E] [ 4880] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.246890 [PHY-SA ] [E] [ 4880] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.247891 [PHY-SA ] [E] [ 4880] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.248828 [PHY-SA ] [E] [ 4880] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.249931 [PHY-SA ] [E] [ 4880] SYNC: detected out-of-sync... skipping slot ...
2023-05-31T14:39:07.251064 [PHY0-NR] [W] [ 4880] PBCH-MIB: CRC failed
2023-05-31T14:39:07.251263 [RF ] [I] Detected RF gap of -10045.6 us. Sending end-of-burst.
2023-05-31T14:39:07.260769 [PHY0-NR] [E] [ 4890] PBCH-MIB: NR SFN (491) does not match current SFN (489)
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alejandroBlancoPizarro
commented on July 24, 2024
Many thanks for the fast reply. I will try with the UHD 3.15 and let you know.
Best,
Alejandro
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alejandroBlancoPizarro
commented on July 24, 2024
Changing to UHD 3.15 helps a bit but I got the same issue.
I changed the laptops to PCs (more powerful) and I was able to run ping for an hour, this is a big improvement. However, once I run iperf, the UE got underflow.
It seems that I need better machines. What are the specifications of the PC that you use as UE?
In any case, I am attaching the UE and gnb logs.
Best,
Alejandro
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andrepuschmann
commented on July 24, 2024
Hey - I'd advise to run the performance script srsran_performance as you have warnings in the gNB logs. But do the same on the UE as well to make sure the CPU isn't scaling down the frequency.
In total I don;t think there is an issue with srsRAN Project or srsUE - it's more that you setup isn't tuned and configured correctly. I am closing the issue therefore.
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andrepuschmann
commented on July 24, 2024
Here is some more infos about performance tuning https://docs.srsran.com/projects/project/en/latest/user_manuals/source/troubleshooting.html?highlight=performance#performance-tuning
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