RF status overflow about srsran_project HOT 24 CLOSED

@pgawlowicz
Instead of using a usrp B210 and a B200-mini I am now using two usrp B200-mini and it worked at the first try ;). Thank you for your help.

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Could you check CPU usage on the srsUE host PC? with htop.
Could you run the srsran_performance on the srsUE host PC?

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@pgawlowicz Thank you for your answer. If I run htop on the gNodeB host computer I get 1.77 1.72 1.62 load average values, and the process that is currently consuming the most resources is the gNB with CPU% 107.
By running it on the UE host computer I get that the load average is 0.30 0.26 0.21 and the most consuming process has CPU% 30.

And I had already set the CPU governor to performance in the UE host computer both by doing echo "performance" | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor and by running the srsran_performance file.

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hi @ruedagarcialaura, any updates on this issue?

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Hi, I changed the GNB channel bandwith to 10 MHz and nof_prb to 52 and I don't get overflows or underflows most of the times. But it is still stuck in Attaching UE...
Here are my config files
ue_rf1.conf.txt
gnb_rf_b210_fdd.txt

And also I get this in the ue log everytime:

2024-05-13T09:33:21.847132 [PHY-SA ] [I] [ 0] SYNC: The SFN sync reached the maximum number of trials (100). Transitioning to IDLE...
2024-05-13T09:33:21.847139 [PHY-SA ] [I] [ 0] Cell Select: Could not synchronize SFN
2024-05-13T09:33:21.847234 [RRC-NR ] [E] Proc "Cell Selection" - Couldn't select new serving cell
2024-05-13T09:33:21.847235 [RRC-NR ] [I] Proc "Cell Selection" - Completed with failure.
2024-05-13T09:33:21.847241 [RRC-NR ] [W] Could not finish setup request. Deallocating dedicatedInfoNAS PDU

Here is the log:
ue3.log

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Could you try to tune TX and RX gains? It seems that the srsUE was not even able to detect the cell

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I've been trying different gain combinations in steps of 5 for different channel bandwidths (5,10,15 and 20 MHz) and no successful results, still stuck in attaching ue... Any recommendation? Thank you in advance

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could you try with an external clock?

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I am trying with the external clock Leo Bdonar GPSDO but it doesn't seem to work.
Here is my config and log of the ue.
ue_external_clock.zip

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could you share also gnb config?

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gnb config file
gnb_rf_b210_fdd.txt

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could you try the default configs from the tutorial with 10mhz bandwidth?

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tutorial_10Mhz_external_clock.zip
Here it is, it doesn't seem to use the external clock source. But the leo bodnar gpsdo has the two leds on and it's connected to both usrps.

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hi, you have to add clock parameter to your config:

ru_sdr: 
  clock: external

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tutorial_10MHz_2.zip
I changed it but it looks the results are the same

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could you change sync to default. What is the spec of the UE PC (cpu, and memory)?

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tutorial_10MHz_3.zip
I got the same result with sync: default

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hmm, strange, the setup runs over the air or RF cables? did you try to tune TX/RX gains?

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Over the air.
I tried with cable one day and the UE didn't find the cell either.
I also tried the ueransim and at least I know the core works fine.

And I have been trying different gain combinations but always get similar results of overflows and doesn't go further than attaching UE...
is there any tip to tune the gains? should the UE tx gain be higher than the gnb gains or maybe the other way around?

And also do the srates necessarily need to be the same for both usrps or can the UE work in a lower srate?

Thank you for all your responses

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I also got this problem,,, following the tutorial but still got RF status overflow problem... O=21, U=0, L=0.
seems that it is nothing to do with the GPS sync issue...
was wondering if changing to a powerful PC works?

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@ruedagarcialaura any update on this issue?

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Hi all, I am seeing similar issue . any update ?

On my side ,I am trying on raspberry pi5 , which 20MHZ bandwidth. ( using USB3 link) with usrp b210 .. seeing issue like..
2024-06-07T16:20:35.866653 [PHY ] [I] [ 4591] Detected overflow, trying to resync SFN
2024-06-07T16:20:35.866661 [PHY ] [W] [ 4591] SFN not yet synchronized, sending out-of-sync
2024-06-07T16:20:35.867576 [PHY ] [W] [ 4592] SFN not yet synchronized, sending out-of-sync

2024-06-07T16:20:35.853009 [RF ] [I] Overflow
2024-06-07T16:20:35.855587 [PHY ] [I] [ 242] SYNC: Waiting for PSS while trying to decode MIB (0/100)
2024-06-07T16:20:35.856773 [PHY ] [I] [ 243] SYNC: Waiting for PSS while trying to decode MIB (1/100)
2024-06-07T16:20:35.857782 [PHY ] [I] [ 244] SYNC: Waiting for PSS while trying to decode MIB (2/100)
2024-06-07T16:20:35.858770 [PHY ] [I] [ 245] SYNC: Waiting for PSS while trying to decode MIB (3/100)
2024-06-07T16:20:35.859804 [PHY ] [I] [ 246] SYNC: Waiting for PSS while trying to decode MIB (4/100)
2024-06-07T16:20:35.860771 [PHY ] [I] [ 247] SYNC: Waiting for PSS while trying to decode MIB (5/100)
2024-06-07T16:20:35.862165 [PHY ] [I] [ 248] SYNC: Waiting for PSS while trying to decode MIB (6/100)

Opening 1 channels in RF device=uhd with args=type=b200,clock=gpsdo,master_clock_rate=23.04e6
Supported RF device list: UHD file
[INFO] [UHD] linux; GNU C++ version 13.2.0; Boost_108300; UHD_4.6.0.0+ds1-5.1build4
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Opening USRP channels=1, args: type=b200,master_clock_rate=23.04e6
[INFO] [UHD RF] RF UHD Generic instance constructed
[INFO] [B200] Detected Device: B210
[INFO] [B200] Operating over USB 3.
[INFO] [B200] Detecting internal GPSDO....
[INFO] [GPS] Found an internal GPSDO: LC_XO, Firmware Rev 1.101
[INFO] [B200] Initialize CODEC control...
[INFO] [B200] Initialize Radio control...
[INFO] [B200] Performing register loopback test...
[INFO] [B200] Register loopback test passed
[INFO] [B200] Performing register loopback test...
[INFO] [B200] Register loopback test passed
[INFO] [B200] Asking for clock rate 23.040000 MHz...
[INFO] [B200] Actually got clock rate 23.040000 MHz.
Setting USRP time to 1136082616.000000s
[INFO] [MULTI_USRP] 1) catch time transition at pps edge
[INFO] [MULTI_USRP] 2) set times next pps (synchronously)

Waiting PHY to initialize ... done!
Attaching UE...
.
Found Cell: Mode=FDD, PCI=6, PRB=100, Ports=4, CP=Normal, CFO=0.2 KHz
Found PLMN: Id=302720, TAC=25060
Could not find Home PLMN Id=310260, trying to connect to PLMN Id=302720
Random Access Transmission: seq=23, tti=4657, ra-rnti=0x8
[INFO] [UHD RF] Tx while waiting for EOB, timed out... 1.13608e+09 >= 0. Starting new burst...
Random Access Transmission: seq=11, tti=4677, ra-rnti=0x8
Random Access Transmission: seq=25, tti=4697, ra-rnti=0x8
Random Access Transmission: seq=21, tti=4737, ra-rnti=0x8
Random Access Transmission: seq=9, tti=4757, ra-rnti=0x8
Random Access Transmission: seq=10, tti=4777, ra-rnti=0x8
Random Access Transmission: seq=6, tti=4797, ra-rnti=0x8
Random Access Transmission: seq=11, tti=4817, ra-rnti=0x8
RF status: O=31, U=10, L=286
RF status: O=42, U=11, L=490
RF status: O=57, U=6, L=482
RF status: O=38, U=8, L=654
RF status: O=31, U=20, L=655
RF status: O=55, U=4, L=568
RF status: O=43, U=19, L=541
RF status: O=37, U=10, L=615
RF status: O=48, U=10, L=468
RF status: O=45, U=16, L=538
RF status: O=46, U=10, L=640
RF status: O=45, U=6, L=579
RF status: O=58, U=8, L=508
RF status: O=42, U=12, L=697
RF status: O=31, U=4, L=324
Attach failed (attempt 1/5)
Quit

it works fine with 5,10 and 15 MHZ.
any recommendation ?

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probably RPi is too slow for 20MHz, you could try to tune the CPU affinities (worker_cpu_mask and sync_cpu_affinity), see here: https://github.com/srsran/srsRAN_4G/blob/master/srsue/src/main.cc#L265-L270, but not sure if it will help.

also you might try to set the cpu governor

sudo systemctl disable ondemand
sudo apt install linux-tools-raspi

sudo nano /etc/default/cpufrequtils
* insert:
* GOVERNOR="performance"

## reboot

sudo cpupower frequency-info
* should show that the CPU is running in performance mode, at maxiumum clock speed
* ```

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Hello, I solved this problem by changing the TX/RX gain: 85 75.

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