Late: 35; Underflow: 1; Overflow: 0; message when I am connecting galaxy M33 5G with enb through USRP x310

[sruthi81]

Here I am sharing the problem when I am connecting my ue with gnb. I am running Open5GS and srsRAN in same machine and usrp x310 is used as RU.

"Late: 35; Underflow: 1; Overflow: 0;" message.

Please help me to solve this issue.

[pgawlowicz]

could you share your configs and log?

[sruthi81]

Yes Sir.

This configuration file example shows how to configure the srsRAN Project gNB to allow srsUE to connect to it.

This specific example uses ZMQ in place of a USRP for the RF-frontend, and creates an FDD cell with 10 MHz bandwidth.

To run the srsRAN Project gNB with this config, use the following command:

sudo ./gnb -c gnb_zmq.yaml

amf:
addr: 127.0.0.5 # The address or hostname of the AMF.
bind_addr: 127.0.0.5 # A local IP that the gNB binds to for traffic from the AMF.

ru_sdr:
device_driver: uhd # The RF driver name.
device_args: addr=192.168.10.2 #tx_port=tcp://127.0.0.1:2000,rx_port=tcp://127.0.0.1:2001,base_srate=23.04e6 # Optionally pass arguments to the selected RF driver.
#sync: gpsdo # Specify the sync source used by the RF.
#device_args: tx_port=tcp://192.168.0.105:2000,rx_port=tcp://192.168.0.114:2001,base_srate=23.04e6 # Optionally pass arguments to the selected RF driver.
clock: internal
srate: 23.04 # RF sample rate might need to be adjusted according to selected bandwidth.
tx_gain: 30 # Transmit gain of the RF might need to adjusted to the given situation.
rx_gain: 30 # Receive gain of the RF might need to adjusted to the given situation.

cell_cfg:
dl_arfcn: 368500 # ARFCN of the downlink carrier (center frequency).
band: 3 # The NR band.
channel_bandwidth_MHz: 20 # Bandwith in MHz. Number of PRBs will be automatically derived.
common_scs: 15 # Subcarrier spacing in kHz used for data.
plmn: "00101" # PLMN broadcasted by the gNB.
tac: 7 # Tracking area code (needs to match the core configuration).
pdcch:
common:
ss0_index: 0 # Set search space zero index to match srsUE capabilities
coreset0_index: 12 # Set search CORESET Zero index to match srsUE capabilities
dedicated:
ss2_type: common # Search Space type, has to be set to common
dci_format_0_1_and_1_1: false # Set correct DCI format (fallback)
prach:
prach_config_index: 1 # Sets PRACH config to match what is expected by srsUE

cu_cp:
inactivity_timer: 7200 # Sets the UE/PDU Session/DRB inactivity timer to 7200 seconds. Supported: [1 - 7200].

log:
filename: /tmp/gnb.log # Path of the log file.
all_level: info # Logging level applied to all layers.
hex_max_size: 0

pcap:
mac_enable: false # Set to true to enable MAC-layer PCAPs.
mac_filename: /tmp/gnb_mac.pcap # Path where the MAC PCAP is stored.
ngap_enable: false # Set to true to enable NGAP PCAPs.
ngap_filename: /tmp/gnb_ngap.pcap # Path where the NGAP PCAP is stored.

I cant open the amf log file, it shows permission denied.

[pgawlowicz]

you can find logs at /tmp/gnb.log

[sruthi81]

ok

[sruthi81]

2025-01-10T09:03:01.399720 [PHY ] [W] [ 22.2] Real-time failure in low-phy: Downlink data late for sector 0 and slot 22.2.
2025-01-10T09:03:02.005172 [RF ] [W] Real-time failure in RF: underflow
2025-01-10T09:03:02.382670 [METRICS ] [I] Cell Scheduler Metrics: error_indications=0 mean_latency=6usec latency_hist=[999, 0, 0, 0, 0, 0, 0, 0, 1, 0]
2025-01-10T09:03:03.008283 [RF ] [W] Real-time failure in RF: underflow
2025-01-10T09:03:03.010741 [RF ] [W] Real-time failure in RF: late

[sruthi81]

Sir,
Please help me to resolve this issue
Thanks

[pgawlowicz]

please try to run this script:
https://github.com/srsran/srsRAN_Project/blob/main/scripts/srsran_performance

and try again.

[sruthi81]

Sir, is it correct?

[sruthi81]

[sruthi81]

same result I got after running the script.