Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.

[houshangaziziaccelleran]

Hi
Has anyone ever experienced such error:

==== CU started ===
Type <h> to view help
EAL: Probe PCI driver: net_i40e (8086:1572) device: 0000:43:00.2 (socket 0)
TELEMETRY: No legacy callbacks, legacy socket not created
Lower PHY in quad executor mode.
Available radio types: uhd.
[INFO] [UHD] linux; GNU C++ version 11.4.0; Boost_107400; UHD_4.7.0.0-0-unknown
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Making USRP object with args 'type=n3xx,master_clock_rate=122.88e6,send_frame_size=8500,recv_frame_size=8500'
[INFO] [MPMD] Initializing 1 device(s) in parallel with args: mgmt_addr=10.10.0.100,type=n3xx,product=n310,serial=32000F1,name=ni-n3xx-32000F1,fpga=XG,claimed=False,addr=10.10.0.100,master_clock_rate=122.88e6,send_frame_size=8500,recv_frame_size=8500
[INFO] [MPM.main] Launching USRP/MPM, version: 4.7.0.0-ga5ed1872
[INFO] [MPM.main] Spawning RPC process...
[INFO] [MPM.PeriphManager] Device serial number: 32000F1
[INFO] [MPM.PeriphManager] Initialized 2 daughterboard(s).
[INFO] [MPM.PeriphManager] init() called with device args `clock_source=internal,time_source=internal'.
[INFO] [MPM.RPCServer] RPC server ready!
[INFO] [MPM.RPCServer] Spawning watchdog task...
[INFO] [MPM.PeriphManager] init() called with device args `fpga=XG,master_clock_rate=122.88e6,mgmt_addr=10.10.0.100,name=ni-n3xx-32000F1,product=n310,recv_frame_size=8500,send_frame_size=8500,clock_source=internal,time_source=internal'.
[INFO] [MULTI_USRP]     1) catch time transition at pps edge
[INFO] [MULTI_USRP]     2) set times next pps (synchronously)
[WARNING] [0/Radio#0] Attempting to set tick rate to 0. Skipping.
[WARNING] [0/Radio#0] Attempting to set tick rate to 0. Skipping.
Cell pci=1, bw=20 MHz, 2T2R, dl_arfcn=626668 (n78), dl_freq=3400.02 MHz, dl_ssb_arfcn=626304, ul_freq=3400.02 MHz

F1-C: Connection to CU-CP on 10.0.140.200:38472 completed
Warning: Configured PRACH occasion collides with PUCCH RBs ([0..1) intersects [0..3)). Some interference between PUCCH and PRACH is expected.
Warning: Configured PRACH occasion collides with PUCCH RBs ([0..1) intersects [0..3)). Some interference between PUCCH and PRACH is expected.
==== DU started ===
Type <h> to view help
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK

This is srsRAN + n310 radio. 20MHz BW/TDD(7DL/2UL)

[jarenass001]

I also have the same problem with x410. Did you solved it?

[houshangaziziaccelleran]

Did you manage to fix this?
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.

[jarenass001]

Yes, finally I could fix it using this config files with usrp x410:

gnb_x410_cotsue.txt
gnb_x410_cotsue_n3.txt

It seemed to be a problem with the gains or with the sampling rate, by the way this configs worked well for me.

[osmanmerty]

Hi jarenass001,

I have the same problem. But I could not reach your .txt file. Can you share us again?

I also get this error: Error: exceeded maximum number of timed out transmissions.

Did you get this error also?

[jarenass001]

Hi osmanmerty,

I think there was an error on the links, so I updated them.

The error Error: exceeded maximum number of timed out transmissions. didn't appear on my x410 but appeared a lot on my b210. I think it's caused by some I/O interruptions, but I can't tell you an accurate solution. When this error appeared, I restarted the gnb until it was running for several minutes without the error.

[osmanmerty]

Hi jarenass001 again,

Thank you for your suggestion. I also decrease the sample rate like you and handled the problem.

[houshangaziziaccelleran]

I get the same error (n310) when I do 100MHz but not when I do 20MHz:

Late: 4; Underflow: 0; Overflow: 0;
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Late: 5; Underflow: 0; Overflow: 0;
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Late: 6; Underflow: 0; Overflow: 0;
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.
Late: 4; Underflow: 0; Overflow: 0;
Error: failed receiving packet. RfnocError: OpTimeout: Control operation timed out waiting for ACK.