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.

[sruthi81]

please help me to resolve the issue.

[sruthi81]

The gnb started but frame size issue is there how to resolve.

[pgawlowicz]

could you share your config? Which OS version do you use?

[sruthi81]

This example configuration outlines how to configure the srsRAN Project gNB to create a single TDD cell

transmitting in band 78, with 20 MHz bandwidth and 30 kHz sub-carrier-spacing. A USRP B200 is configured

as the RF frontend using split 8. Note in this example an external clock source is not used, so the sync

is not defined and the default is used.

amf:
addr: 127.0.1.100
bind_addr: 127.0.0.1

ru_sdr:
device_driver: uhd
device_args: type=b200,num_recv_frames=64,num_send_frames=64
srate: 23.04
otw_format: sc12
tx_gain: 80
rx_gain: 40

cell_cfg:
dl_arfcn: 632628
band: 78
channel_bandwidth_MHz: 20
common_scs: 30
plmn: "00101"
tac: 7
pci: 1

log:
filename: /tmp/gnb.log
all_level: warning

pcap:
mac_enable: false
mac_filename: /tmp/gnb_mac.pcap
ngap_enable: false
ngap_filename: /tmp/gnb_ngap.pcap

[sruthi81]

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.

[sruthi81]

and I am using Ubuntu 22.04.5 LTS

[sruthi81]

please help me to resolve this issue