XAPP simple_rc_xapp.py fail to enforce PRB allocation on CU-DU split with USRP B210 and quectel RM520N-GL on slicing #1366
Description
I am testing the oran-sc-ric slicing XAPP (simple_rc_xapp.py) enforcement with two slices, and Open5gs and a CU/DU split with a DU connected to the USRP B210 as an antenna, two UE with different slice configuration using Quectel modules. When setting the --gnb_cu_ue_f1ap_id on the XAPP with values diffferent from 0 the enforcement fails.
Success cases happened when the gNB-CU-UE-F1AP-ID value was zero, which is almost difficult to set up on the Quectel due to the behaviour of the module of performing a Registration request by setting the gNB-CU-UE-F1AP-ID increased to 1 or more.
The UE PRB allocation fail to be enforced without further information besides E2 RIC Control Failure. My impression is when the mapping of DU-UE-ID counter increases, it does not properly work to enforce the RIC policy.
Using the following configuration:
f1ap:
cu_cp_addr: 127.0.10.1
bind_addr: 127.0.10.2
f1u:
socket:
-
bind_addr: 127.0.10.2
ru_sdr:
device_driver: uhd
device_args: type=b200,num_recv_frames=64,num_send_frames=64,serial=34A03E8
srate: 23.04
otw_format: sc12
tx_gain: 80
rx_gain: 40
cell_cfg:
dl_arfcn: 650000 # ARFCN of the downlink carrier (center frequency).
band: 78 # The NR band.
channel_bandwidth_MHz: 20 # Bandwith in MHz. Number of PRBs will be automatically derived.
common_scs: 30 # 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).
pci: 1
slicing: # Optional TEXT. Configure network slicing options. This can only be set via the configuration file.
- # Configure Slice 1
sst: 1 # Optional UINT (1). Sets the Slice Service Type. Supported: [0 - 255].
sd: 0x000001 # Optional UINT (0). Sets the Service Differentiator. Supported: [0-16777215].
#sched_cfg: # Scheduler configuration for the slice
#min_prb_policy_ratio: 0 # Optional UINT (0). Sets the minimum percentage of PRBs to be allocated to the slice. Supported [0 - 100].
#max_prb_policy_ratio: 100
- # Configure Slice 1
sst: 2 # Optional UINT (1). Sets the Slice Service Type. Supported: [0 - 255].
sd: 0x000002 # Optional UINT (0). Sets the Service Differentiator. Supported: [0-16777215].
#sched_cfg: # Scheduler configuration for the slice
# min_prb_policy_ratio: 0 # Optional UINT (0). Sets the minimum percentage of PRBs to be allocated to the slice. Supported [0 - 100].
# max_prb_policy_ratio: 100
log:
filename: /tmp/du.log
all_level: debug
f1ap_level: debug
mac_level: debug
du_level: debug
e2ap_level: debug
radio_level: info
pcap:
mac_enable: false
mac_filename: /tmp/du_mac.pcap
f1ap_enable: false
f1ap_filename: /tmp/du_f1ap.pcap
f1u_enable: false
f1u_filename: /tmp/du_f1u.pcap
e2:
enable_du_e2: true # Enable DU E2 agent (one for each DU instance)
e2sm_kpm_enabled: true # Enable KPM service module
e2sm_rc_enabled: true # Enable RC service module
addr: 10.0.2.10 # RIC IP address
bind_addr: 10.0.2.1 # A local IP that the E2 agent binds to for traffic from the RIC. ONLY required if running the RIC on a separate machine.
port: 36421 du.log on failing part:
2025-09-22T09:28:17.597774 [E2-DU ] [I] Handling E2 PDU of type initiatingMessage
2025-09-22T09:28:17.597781 [E2-DU ] [I] E2AP SDU, "initiatingMessage.RICcontrolRequest"
2025-09-22T09:28:17.597783 [E2-DU ] [I] Received RIC Control Request
2025-09-22T09:28:17.597806 [E2SM-RC ] [I] Slice-level PRB quota Control Request for UE gNB-DU-UE-F1AP-ID=1:
RRM Policy Ratio Group:
RRM Policy:
Min PRB Policy Ratio: 10
Max PRB Policy Ratio: 30
Dedicated PRB Policy Ratio: 100
RRM Policy Member List:
- PLMN:00101, SST:1, SD:1
2025-09-22T09:28:17.597816 [E2-DU ] [I] Sending E2 RIC Control Failure
2025-09-22T09:28:17.598098 [FAPI ] [D] [ 164.4] Sector#0: Slot.indication time_point=1758533297600597994
I tested correctly mapping of sending a not existing UE-ID also:
du.log on failing part:
2025-09-22T09:28:28.858749 [E2-DU ] [I] Handling E2 PDU of type initiatingMessage
2025-09-22T09:28:28.858749 [E2-DU ] [I] E2AP SDU, "initiatingMessage.RICcontrolRequest"
2025-09-22T09:28:28.858751 [E2-DU ] [I] Received RIC Control Request
2025-09-22T09:28:28.858775 [E2SM-RC ] [I] Slice-level PRB quota Control Request received but UE not found, gNB-CU-UE-F1AP-ID=2
2025-09-22T09:28:28.858780 [E2-DU ] [I] Sending E2 RIC Control Failure
I attach the complete logs of CU/DU.