Samsung A53 cannot connect to the network

[fllay]

It seems to try to connect but it is fail. Any idea? I try both docker and build from source. I got the same.

ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:48.686Z","caller":"nas/handler.go:143","msg":"UE Context derived from Suci","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:4","supi":"001010000062719","suci":"suci-0-001-01-0-0-0-0000062719"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:48.686Z","caller":"nas/handler.go:81","msg":"Received NAS message","component":"AMF","MessageType":"RegistrationRequest","SUPI":"001010000062719"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:48.686Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"DownlinkNasTransport","direction":"outbound","local_address":"10.3.0.2:38412","remote_address":"192.168.68.30:36298"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:48.745Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UplinkNASTransport","direction":"inbound","local_address":"10.3.0.2:38412","remote_address":"192.168.68.30:36298"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:48.745Z","caller":"nas/handler.go:81","msg":"Received NAS message","component":"AMF","MessageType":"AuthenticationResponse","SUPI":"001010000062719"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:48.746Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"DownlinkNasTransport","direction":"outbound","local_address":"10.3.0.2:38412","remote_address":"192.168.68.30:36298"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:48.765Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UplinkNASTransport","direction":"inbound","local_address":"10.3.0.2:38412","remote_address":"192.168.68.30:36298"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:48.766Z","caller":"nas/handler.go:81","msg":"Received NAS message","component":"AMF","MessageType":"SecurityModeComplete","SUPI":"001010000062719"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:48.766Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"InitialContextSetupRequest","direction":"outbound","local_address":"10.3.0.2:38412","remote_address":"192.168.68.30:36298"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:48.766Z","caller":"message/send.go:367","msg":"Sent NGAP initial context setup request","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:5","supi":"001010000062719"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:48.785Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"InitialContextSetupResponse","direction":"inbound","local_address":"10.3.0.2:38412","remote_address":"192.168.68.30:36298"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:48.909Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UplinkNASTransport","direction":"inbound","local_address":"10.3.0.2:38412","remote_address":"192.168.68.30:36298"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:48.909Z","caller":"nas/handler.go:81","msg":"Received NAS message","component":"AMF","MessageType":"RegistrationComplete","SUPI":"001010000062719"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:51.685Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UEContextReleaseRequest","direction":"inbound","local_address":"10.3.0.2:38412","remote_address":"192.168.68.30:36298"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:51.685Z","caller":"ngap/handle_ue_context_release_request.go:83","msg":"UE Context Release Cause","component":"AMF","ran_addr":"192.168.68.30:36298","AMF_UE_NGAP_ID":"5","Cause":"Radio Network: Unspecified (0)"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:51.685Z","caller":"ngap/handle_ue_context_release_request.go:94","msg":"Ue Context in GMM-Registered","component":"AMF","ran_addr":"192.168.68.30:36298","AMF_UE_NGAP_ID":"5"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:51.685Z","caller":"ngap/handle_ue_context_release_request.go:112","msg":"Pdu Session IDs not received from gNB, Releasing the UE Context with SMF using local context","component":"AMF","ran_addr":"192.168.68.30:36298","AMF_UE_NGAP_ID":"5"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:51.685Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UEContextReleaseCommand","direction":"outbound","local_address":"10.3.0.2:38412","remote_address":"192.168.68.30:36298"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:51.821Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UEContextReleaseComplete","direction":"inbound","local_address":"10.3.0.2:38412","remote_address":"192.168.68.30:36298"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:51.821Z","caller":"ngap/handle_ue_context_release_complete.go:145","msg":"Pdu Session IDs not received from gNB, Releasing the UE Context with SMF using local context","component":"AMF","ran_addr":"192.168.68.30:36298","AMF_UE_NGAP_ID":"5"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:51.821Z","caller":"ngap/handle_ue_context_release_complete.go:161","msg":"Release UE Context: N2 Connection Release","component":"AMF","ran_addr":"192.168.68.30:36298","supi":"001010000062719"}
ella-core-1  | {"level":"info","ts":"2026-02-24T07:03:51.821Z","caller":"context/ran_ue.go:75","msg":"ran ue removed","component":"AMF","RanUeNgapID":4}```

[gruyaume]

The logs show that registration completes successfully but ~3 seconds later, the gNB sends a UEContextReleaseRequest with cause Radio Network: Unspecified (0).

• What gNB hardware/software are you using?
• What UE are you using?
• Is the APN/DNN configured on the UE?
• Do you see any PDU session request attempts in the gNB logs?
• What version of Ella Core are you using?

[fllay]

• I am using ocudu with ettus B210
• Samsung A53 5G
• Yes the APN/DNN are correct. I can use ocudu with open5GS without any problem
• I am not sure
• 1.3.0

i am using

  ella-core:
    image: ghcr.io/ellanetworks/ella-core:v1.3.0
    restart: unless-stopped
    entrypoint: /bin/core --config /core.yaml
    privileged: true
    ports:
      - "5002:5002"
    networks:
      default:
        driver_opts:
              com.docker.network.endpoint.ifname: eth0
      n3:
        driver_opts:
              com.docker.network.endpoint.ifname: n3
        ipv4_address: 10.3.0.2

networks:
  n3:
    internal: true
    ipam:
      config:
        - subnet: 10.3.0.0/24

and core.yaml

logging:
  system:
    level: "debug"
    output: "stdout"
  audit:
    output: "stdout"
db:
  path: "core.db"
interfaces:
  n2:
    name: "n3-upf-veth"
    port: 38412
  n3:
    name: "n3-upf-veth"
  n6:
    name: "eth0"
  api:
    address: "0.0.0.0"
    port: 5002
xdp:
  attach-mode: "generic"
telemetry:
  enabled: false

however on this machine, I dont have eth0 interface the only physical interfaces are wlo1 and enp86s0 and wlo1 is connected to the internet. When I try to change

    networks:
      default:
        driver_opts:
              com.docker.network.endpoint.ifname: eth0

to

    networks:
      default:
        driver_opts:
              com.docker.network.endpoint.ifname: wlo1

and

  n6:
    name: "eth0"

to

  n6:
    name: "wlo1"

the container restart with

Attaching to ella-core-1
ella-core-1  | {"level":"info","ts":"2026-02-24T16:13:08.072Z","caller":"runtime/runtime.go:55","msg":"Starting Ella Core","component":"Ella","version":"v1.3.0","revision":"c909f722de86406836825ffc2c4f26110e2f6f4e"}
ella-core-1  | {"level":"info","ts":"2026-02-24T16:13:08.102Z","caller":"db/db.go:487","msg":"Initialized audit log retention policy","component":"DB","days":7}
ella-core-1  | {"level":"info","ts":"2026-02-24T16:13:08.103Z","caller":"db/db.go:500","msg":"Initialized radio event retention policy","component":"DB","days":7}
ella-core-1  | {"level":"info","ts":"2026-02-24T16:13:08.103Z","caller":"db/db.go:513","msg":"Initialized subscriber usage retention policy","component":"DB","days":365}
ella-core-1  | {"level":"fatal","ts":"2026-02-24T16:13:08.103Z","caller":"upf/upf.go:78","msg":"Lookup network iface","component":"UPF","iface":"eth0","error":"route ip+net: no such network interface"}
ella-core-1 exited with code 1 (restarting)
ella-core-1  | {"level":"info","ts":"2026-02-24T16:13:08.609Z","caller":"runtime/runtime.go:55","msg":"Starting Ella Core","component":"Ella","version":"v1.3.0","revision":"c909f722de86406836825ffc2c4f26110e2f6f4e"}
ella-core-1  | {"level":"fatal","ts":"2026-02-24T16:13:08.613Z","caller":"upf/upf.go:78","msg":"Lookup network iface","component":"UPF","iface":"eth0","error":"route ip+net: no such network interface"}
ella-core-1 exited with code 1 (restarting)
ella-core-1  | {"level":"info","ts":"2026-02-24T16:13:09.130Z","caller":"runtime/runtime.go:55","msg":"Starting Ella Core","component":"Ella","version":"v1.3.0","revision":"c909f722de86406836825ffc2c4f26110e2f6f4e"}
ella-core-1  | {"level":"fatal","ts":"2026-02-24T16:13:09.135Z","caller":"upf/upf.go:78","msg":"Lookup network iface","component":"UPF","iface":"eth0","error":"route ip+net: no such network interface"}
ella-core-1 exited with code 1 (restarting)
ella-core-1  | {"level":"info","ts":"2026-02-24T16:13:09.809Z","caller":"runtime/runtime.go:55","msg":"Starting Ella Core","component":"Ella","version":"v1.3.0","revision":"c909f722de86406836825ffc2c4f26110e2f6f4e"}
ella-core-1  | {"level":"fatal","ts":"2026-02-24T16:13:09.815Z","caller":"upf/upf.go:78","msg":"Lookup network iface","component":"UPF","iface":"eth0","error":"route ip+net: no such network interface"}
ella-core-1 exited with code 1 (restarting)
ella-core-1  | {"level":"info","ts":"2026-02-24T16:13:10.894Z","caller":"runtime/runtime.go:55","msg":"Starting Ella Core","component":"Ella","version":"v1.3.0","revision":"c909f722de86406836825ffc2c4f26110e2f6f4e"}
ella-core-1  | {"level":"fatal","ts":"2026-02-24T16:13:10.898Z","caller":"upf/upf.go:78","msg":"Lookup network iface","component":"UPF","iface":"eth0","error":"route ip+net: no such network interface"}

It looks for eth0. Any idea what go wrong?

[gruyaume]

It seems like your docker-compose has no volume mount for core.yaml and the container uses the config baked into the image, which hardcodes n6.name: "eth0". You may also want to start by running Ella Core from source before using Docker to root out any Docker-related issues.

Also, wlo1 is a WiFi interface right? As far as I know we haven't validated running Ella Core with its n6 interface using WiFi. It may still work, I'm not sure. I would recommend using your physical enp86s0 instead and leveraging XDP native for faster packet processing.

[fllay]

Hi I now run from source with

pi@pi5gnuc:~/src/core$ cat core.yaml
logging:
  system:
    level: "debug"
    output: "stdout"
  audit:
    output: "stdout"
db:
  path: "core.db"
interfaces:
  n2:
    name: "n3-upf-veth"
    port: 38412
  n3:
    name: "n3-upf-veth"
  n6:
    name: "enp86s0"
  api:
    address: "0.0.0.0"
    port: 5002
xdp:
  attach-mode: "native"
telemetry:
  enabled: false

and

pi@pi5gnuc:~/src/ocudu/build/apps/gnb$ cat  ~/src/5gconfig/ella_b200_2x2.yaml 
cu_cp:
  amf:
    addr: 10.202.0.3
    port: 38412
    bind_addr: 10.202.0.5
    supported_tracking_areas:
      - tac: 7
        plmn_list:
          - plmn: "00101"
            tai_slice_support_list:
              - sst: 1
  inactivity_timer: 300
  security:
    nea_pref_list: nea2,nea1
    nia_pref_list: nia2,nia1
cu_up:
  ngu:
    socket:
      - bind_addr: 10.202.0.5
ru_sdr:
  device_driver: uhd
  device_args: type=b200
  clock: internal
  srate: 23.04
  tx_gain: 80
  rx_gain: 40

cell_cfg:
  dl_arfcn: 632628
  band: 78
  channel_bandwidth_MHz: 20
  common_scs: 30
  plmn: "00101"
  tac: 7
  pdcch:
    dedicated:
      ss2_type: common
      dci_format_0_1_and_1_1: false
  prach:
    prach_config_index: 160
  pdsch:
    mcs_table: qam64
  pusch:
    mcs_table: qam64

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

pcap:
  mac_enable: disable
  ngap_enable: disable

I got the same error

{"level":"info","ts":"2026-02-25T06:17:55.884Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"InitialUEMessage","direction":"inbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:47778"}
{"level":"debug","ts":"2026-02-25T06:17:55.884Z","caller":"ngap/handle_initial_ue_message.go:124","msg":"Added Ran UE to the pool","component":"AMF","ran_addr":"10.202.0.5:47778","RanUeNgapID":0}
{"level":"debug","ts":"2026-02-25T06:17:55.884Z","caller":"ngap/handle_initial_ue_message.go:177","msg":"RRC Establishment Cause","component":"AMF","ran_addr":"10.202.0.5:47778","AMF_UE_NGAP_ID":"1","Value":8}
{"level":"debug","ts":"2026-02-25T06:17:55.884Z","caller":"ngap/handle_initial_ue_message.go:182","msg":"Trigger initial Context Setup procedure","component":"AMF","ran_addr":"10.202.0.5:47778"}
{"level":"info","ts":"2026-02-25T06:17:55.884Z","caller":"nas/handler.go:81","msg":"Received NAS message","component":"AMF","MessageType":"RegistrationRequest","SUPI":""}
{"level":"debug","ts":"2026-02-25T06:17:55.884Z","caller":"context/amf_ue.go:428","msg":"set ongoing procedure","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:1","ongoingProcedure":"Registration","previousOnGoingProcedure":"Nothing"}
{"level":"debug","ts":"2026-02-25T06:17:55.884Z","caller":"gmm/handle_registration_request.go:111","msg":"Received Registration Request","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:1","registrationType":"Initial Registration"}
{"level":"debug","ts":"2026-02-25T06:17:55.884Z","caller":"gmm/handle_registration_request.go:132","msg":"UE used SUCI identity for registration","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:1"}
{"level":"debug","ts":"2026-02-25T06:17:55.884Z","caller":"gmm/authentication_procedure.go:57","msg":"UE has SUCI / SUPI","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:1"}
{"level":"debug","ts":"2026-02-25T06:17:55.884Z","caller":"gmm/authentication_procedure.go:64","msg":"UE has no valid security context - continue with the authentication procedure","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:1"}
{"level":"info","ts":"2026-02-25T06:17:55.884Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"DownlinkNasTransport","direction":"outbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:47778"}
{"level":"info","ts":"2026-02-25T06:17:55.943Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UplinkNASTransport","direction":"inbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:47778"}
{"level":"info","ts":"2026-02-25T06:17:55.944Z","caller":"nas/handler.go:81","msg":"Received NAS message","component":"AMF","MessageType":"AuthenticationResponse","SUPI":""}
{"level":"debug","ts":"2026-02-25T06:17:55.944Z","caller":"gmm/security_mode.go:14","msg":"Security Mode Procedure","component":"AMF","supi":"001010000062719"}
{"level":"info","ts":"2026-02-25T06:17:55.944Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"DownlinkNasTransport","direction":"outbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:47778"}
{"level":"info","ts":"2026-02-25T06:17:55.963Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UplinkNASTransport","direction":"inbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:47778"}
{"level":"debug","ts":"2026-02-25T06:17:55.964Z","caller":"context/amf_ue.go:626","msg":"Decrypt NAS message","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:1","supi":"001010000062719","algorithm":2,"ULCount":0}
{"level":"info","ts":"2026-02-25T06:17:55.964Z","caller":"nas/handler.go:81","msg":"Received NAS message","component":"AMF","MessageType":"SecurityModeComplete","SUPI":"001010000062719"}
{"level":"debug","ts":"2026-02-25T06:17:55.964Z","caller":"gmm/reg_initial.go:46","msg":"use original GUTI","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:1","supi":"001010000062719","guti":"00000000"}
{"level":"info","ts":"2026-02-25T06:17:55.964Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"InitialContextSetupRequest","direction":"outbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:47778"}
{"level":"info","ts":"2026-02-25T06:17:55.964Z","caller":"message/send.go:367","msg":"Sent NGAP initial context setup request","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:1","supi":"001010000062719"}
{"level":"info","ts":"2026-02-25T06:17:56.194Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"InitialContextSetupResponse","direction":"inbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:47778"}
{"level":"info","ts":"2026-02-25T06:17:56.316Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UERadioCapabilityInfoIndication","direction":"inbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:47778"}
{"level":"debug","ts":"2026-02-25T06:17:56.316Z","caller":"ngap/handle_ue_radio_capability_info_indication.go:61","msg":"Handle UE Radio Capability Info Indication","component":"AMF","ran_addr":"10.202.0.5:47778","RanUeNgapID":0,"AmfUeNgapID":1}
{"level":"info","ts":"2026-02-25T06:17:56.316Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UplinkNASTransport","direction":"inbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:47778"}
{"level":"debug","ts":"2026-02-25T06:17:56.316Z","caller":"context/amf_ue.go:626","msg":"Decrypt NAS message","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:1","supi":"001010000062719","algorithm":2,"ULCount":1}
{"level":"info","ts":"2026-02-25T06:17:56.316Z","caller":"nas/handler.go:81","msg":"Received NAS message","component":"AMF","MessageType":"RegistrationComplete","SUPI":"001010000062719"}
{"level":"info","ts":"2026-02-25T06:17:58.232Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UEContextReleaseRequest","direction":"inbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:47778"}
{"level":"debug","ts":"2026-02-25T06:17:58.232Z","caller":"ngap/handle_ue_context_release_request.go:75","msg":"Handle UE Context Release Request","component":"AMF","ran_addr":"10.202.0.5:47778","AMF_UE_NGAP_ID":"1","AmfUeNgapID":1,"RanUeNgapID":0}
{"level":"info","ts":"2026-02-25T06:17:58.232Z","caller":"ngap/handle_ue_context_release_request.go:83","msg":"UE Context Release Cause","component":"AMF","ran_addr":"10.202.0.5:47778","AMF_UE_NGAP_ID":"1","Cause":"Radio Network: RadioConnectionWithUeLost (21)"}
{"level":"info","ts":"2026-02-25T06:17:58.232Z","caller":"ngap/handle_ue_context_release_request.go:94","msg":"Ue Context in GMM-Registered","component":"AMF","ran_addr":"10.202.0.5:47778","AMF_UE_NGAP_ID":"1"}
{"level":"info","ts":"2026-02-25T06:17:58.232Z","caller":"ngap/handle_ue_context_release_request.go:112","msg":"Pdu Session IDs not received from gNB, Releasing the UE Context with SMF using local context","component":"AMF","ran_addr":"10.202.0.5:47778","AMF_UE_NGAP_ID":"1"}
{"level":"info","ts":"2026-02-25T06:17:58.233Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UEContextReleaseCommand","direction":"outbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:47778"}
{"level":"info","ts":"2026-02-25T06:17:58.369Z","caller":"logger/logger.go:218","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UEContextReleaseComplete","direction":"inbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:47778"}
{"level":"debug","ts":"2026-02-25T06:17:58.369Z","caller":"ngap/handle_ue_context_release_complete.go:128","msg":"Release UE Context in GMM-Registered","component":"AMF","ran_addr":"10.202.0.5:47778","AMF_UE_NGAP_ID":"1","supi":"001010000062719"}
{"level":"info","ts":"2026-02-25T06:17:58.369Z","caller":"ngap/handle_ue_context_release_complete.go:145","msg":"Pdu Session IDs not received from gNB, Releasing the UE Context with SMF using local context","component":"AMF","ran_addr":"10.202.0.5:47778","AMF_UE_NGAP_ID":"1"}
{"level":"info","ts":"2026-02-25T06:17:58.369Z","caller":"ngap/handle_ue_context_release_complete.go:161","msg":"Release UE Context: N2 Connection Release","component":"AMF","ran_addr":"10.202.0.5:47778","supi":"001010000062719"}
{"level":"info","ts":"2026-02-25T06:17:58.369Z","caller":"context/ran_ue.go:75","msg":"ran ue removed","component":"AMF","RanUeNgapID":0}

I am using ethernet now.

[gruyaume]

Are you using the same gnb config as you were with Open5Gs? I see the security section has nea2 meaning you must write the home network private key in the SIM card. Also make sure the cell_cfg is identical

Also, the UE context is released by the radio (with causes Unspecified in the first set of logs and RadioConnectionWithUeLost in the second), not the core. It would be helpful to see the logs on the radio side to understand why it drops the UE.

[fllay]

Thank you for your help. Now I copy gnb config for open5gs and change only AMF and bind IPs. Same error. here gnb.log
gnb.log
I saw this line

2026-02-25T14:50:46.607811 [DU-MNG  ] [I] ue=0: RLF timer expired with cause="MAC max KOs reached". Requesting a UE release...

I dont know what it means.

[gruyaume]

It really does feel like a config mismatch between Ella Core and the gnb (and or UE).

Can you please validate the following:

• Remove one of the PLMNs in OCUDU. I see both 00101 and 00102 in OCUDU but Ella Core only supports one PLMN. Keep the one that matches with Ella Core's config.
• Ella Core is configured with SST 1 and no SD
• Re-validate that the (DNN/APN) matches between Ella Core (Data Networks page) and what your UE is configured to request. (Access Point Names in Android).

The logs show your UE registers successfully but never requests a PDU session, which typically indicates a mismatch in one of the above.

[gruyaume]

@fllay was there any progress in this issue?

[fllay]

I fixed the config files as you mention.

cu_cp:
  amf:
    addr: 10.202.0.3
    port: 38412
    bind_addr: 10.202.0.5
    supported_tracking_areas:
      - tac: 7
        plmn_list:
          - plmn: "00101"
            tai_slice_support_list:
              - sst: 1
ru_sdr:
  device_driver: uhd                                            # The RF driver name.
  device_args: type=b200,serial=3275461,num_recv_frames=64,num_send_frames=64  # Optionally pass arguments to the selected RF driver.
  clock: internal                                                       # Specify the clock source used by the RF.
  sync: internal                                                        # Specify the sync source used by the RF.
  srate: 23.04                                                  # RF sample rate might need to be adjusted according to selected bandwidth.
  otw_format: sc12
  tx_gain: 82                                                  # Transmit gain of the RF might need to adjusted to the given situation.
  rx_gain: 65                                         #60          # Receive gain of the RF might need to adjusted to the given situation.

cell_cfg:
  dl_arfcn: 632628                                                # 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                                                          # Physical cell ID.
  nof_antennas_dl: 2
  nof_antennas_ul: 2
  ssb:
    ssb_period: 10
  pdsch:
    mcs_table: qam256
log:
  filename: /tmp/gnb.log                                          # Path of the log file.
  all_level:  info                                               # Logging level applied to all layers.
  #phy_rx_symbols_filename: /tmp/iq.log

pcap:
  mac_type: dlt
  mac_enable: true                                               # Set to true to enable MAC-layer PCAPs.
  mac_filename: /tmp/gnb_mac.pcap  #/home/pi/src/fifo/gnb_mac.pcap         #/tmp/gnb_mac.pcap                                 # Path where the MAC PCAP is stored.
  ngap_enable: true                                              # Set to true to enable NGAP PCAPs.
  ngap_filename: /tmp/gnb_ngap.pcap #/home/pi/src/fifo/gnb_ngap.pcap                               # Path where the NGAP PCAP is stored.

I set SST 1 with no SD

and, APN.
At the core,

In the phone.

I still got the same result.

2026-03-02T03:27:29.188434 [PHY     ] [I] [  686.10] PDSCH: rnti=0x4602 h_id=0 k1=7 prb=[0, 3) symb=[2, 14) mod=QPSK rv=0 tbs=15 t=18.9us
2026-03-02T03:27:29.188435 [PHY     ] [I] [  686.10] PDCCH: rnti=0x4602 ss_id=1 format=1_0 cce=0 al=4 t=24.4us
2026-03-02T03:27:29.191496 [PHY     ] [I] [   686.8] PUCCH: rnti=0x4602 format=1 prb1=4 prb2=na symb=[0, 14) cs=0 occ=0 sr=no metric=0.2 sinr=-19.0dB t=22.5us
2026-03-02T03:27:29.191641 [PHY     ] [I] [   686.9] PUCCH: rnti=0x4602 format=2 prb=[7, 8) prb2=na symb=[4, 6) csi1=2222222 sinr=-12.3dB t=31.9us
2026-03-02T03:27:29.195972 [PHY     ] [I] [  686.17] PUCCH: rnti=0x4602 format=1 prb1=2 prb2=na symb=[0, 14) cs=0 occ=0 ack=2 metric=0.2 sinr=-18.6dB t=16.7us
2026-03-02T03:27:29.198421 [SCHED   ] [I] [  687.10] Slot decisions pci=1 t=4us (1 PDSCH, 0 PUSCHs, 0 PUCCHs): DL: ue=0 c-rnti=0x4602 h_id=0 ss_id=1 rb=[0..3) k1=7 newtx=false rv=0 tbs=15
2026-03-02T03:27:29.198456 [PHY     ] [I] [  687.10] PDSCH: rnti=0x4602 h_id=0 k1=7 prb=[0, 3) symb=[2, 14) mod=QPSK rv=0 tbs=15 t=17.3us
2026-03-02T03:27:29.198457 [PHY     ] [I] [  687.10] PDCCH: rnti=0x4602 ss_id=1 format=1_0 cce=0 al=4 t=22.5us
2026-03-02T03:27:29.200437 [DU-F1   ] [I] ue=0 du_ue=1 cu_ue=1 proc="UE Context Release": RRC container not ACKed within a time window of 120msec. Proceeding with the UE context release...
2026-03-02T03:27:29.200441 [DU-MNG  ] [I] ue=0 proc="UE Delete": Procedure started....
2026-03-02T03:27:29.200449 [DU-MNG  ] [I] ue=0: SRB and DRB traffic stopped
2026-03-02T03:27:29.200452 [DU-F1   ] [I] ue=0 c-rnti=0x4602 du_ue=1 cu_ue=1: F1 UE context removed.

Where else I can look for debugging?

[gruyaume]

No PDU Session Establishment Request is ever sent by the UE.

The gNB is releasing the UE because it lost radio contact, not because the core requested it. This could be an RF issue. Some things to try:

• Reduce the distance between the UE and antenna
• Check SMA connectors and cabling between the B210 and antenna
• Try with a different UE if possible, to isolate whether this is device-specific
• Validate that you are using exactly the same RF config as when you tried with Open5Gs

I'm no RF expert though, if you need help on that front I'd recommend engaging the OCUDU team.

@ghislainbourgeois do you see something else I'm not seeing?

[ghislainbourgeois]

I agree with your assessment, in the last Ella Core logs provided, it shows the core receives a Context Release request from the RAN, because the UE connection was lost:

{"level":"info","ts":"2026-02-25T06:17:58.232Z","caller":"ngap/handle_ue_context_release_request.go:83","msg":"UE Context Release Cause","component":"AMF","ran_addr":"10.202.0.5:47778","AMF_UE_NGAP_ID":"1","Cause":"Radio Network: RadioConnectionWithUeLost (21)"}

This logs line from OCUDU seems to be the trigger:

2026-03-02T03:27:29.200437 [DU-F1   ] [I] ue=0 du_ue=1 cu_ue=1 proc="UE Context Release": RRC container not ACKed within a time window of 120msec. Proceeding with the UE context release...

Depending on the hardware setup, this could possibly be a performance issue on the node running OCUDU. There are some realtime constraints that need to be respected for this to work properly, so it might be worth a look also.

[fllay]

The hardware setup works fine with open5GS with the same RF setup in gnb config file. It can be verify easily, I just reboot the machine then start with open5GS + ocucu gnb without touching b210. Anyway, It might be SIM card issue I am not sure. What kind of SIM card do you use?

[gruyaume]

I use Sysmocom SIM cards. You may also need to set the home network public key on the SIM card (and validate that IMSI, Key, and OPc are the same as in the subscriber created in Ella Core).

[gruyaume]

Hello @fllay , your problem seems very similar to one we just observed with a different user where their SIM card had multiple home network keys configured and the UE used one that was different than the one configured in Ella Core.

In Ella Core v1.6, we added the ability to configure multiple Home Network keys using Profile A and B.

Can you try upgrading and updating the keys in the Operator page to match what you had in Open5Gs?

[fllay]

Hi, thank you for the following up. However, it still cannot register the UE but it seems that it is different error.

{"level":"info","ts":"2026-03-19T14:41:26.066Z","caller":"logger/logger.go:234","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"InitialUEMessage","direction":"inbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:34221"}
{"level":"debug","ts":"2026-03-19T14:41:26.066Z","caller":"ngap/handle_initial_ue_message.go:136","msg":"Added Ran UE to the pool","component":"AMF","ran_addr":"10.202.0.5:34221","RanUeNgapID":7}
{"level":"debug","ts":"2026-03-19T14:41:26.066Z","caller":"ngap/handle_initial_ue_message.go:189","msg":"RRC Establishment Cause","component":"AMF","ran_addr":"10.202.0.5:34221","AMF_UE_NGAP_ID":"8","Value":8}
{"level":"debug","ts":"2026-03-19T14:41:26.066Z","caller":"ngap/handle_initial_ue_message.go:194","msg":"Trigger initial Context Setup procedure","component":"AMF","ran_addr":"10.202.0.5:34221"}
{"level":"debug","ts":"2026-03-19T14:41:26.066Z","caller":"nas/handler.go:137","msg":"Guti received in Registration Request Message","component":"AMF","guti":"00101cafe001b942001"}
{"level":"info","ts":"2026-03-19T14:41:26.066Z","caller":"nas/handler.go:200","msg":"UE Context derived from Guti","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:7","supi":"imsi-001010000062719","guti":"00101cafe001b942001"}
{"level":"info","ts":"2026-03-19T14:41:26.066Z","caller":"nas/handler.go:78","msg":"Received NAS message","component":"AMF","MessageType":"RegistrationRequest","SUPI":"imsi-001010000062719"}
{"level":"debug","ts":"2026-03-19T14:41:26.066Z","caller":"context/amf_ue.go:526","msg":"set ongoing procedure","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","ongoingProcedure":"Registration","previousOnGoingProcedure":"Nothing"}
{"level":"debug","ts":"2026-03-19T14:41:26.066Z","caller":"gmm/handle_registration_request.go:117","msg":"Received Registration Request","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","registrationType":"Initial Registration"}
{"level":"debug","ts":"2026-03-19T14:41:26.066Z","caller":"gmm/handle_registration_request.go:146","msg":"UE used GUTI identity for registration","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","guti":"00101cafe001b942001"}
{"level":"debug","ts":"2026-03-19T14:41:26.066Z","caller":"gmm/authentication_procedure.go:57","msg":"UE has SUCI / SUPI","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8"}
{"level":"debug","ts":"2026-03-19T14:41:26.066Z","caller":"gmm/authentication_procedure.go:60","msg":"UE has a valid security context - skip the authentication procedure","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8"}
{"level":"debug","ts":"2026-03-19T14:41:26.066Z","caller":"gmm/security_mode.go:14","msg":"Security Mode Procedure","component":"AMF","supi":"imsi-001010000062719"}
{"level":"debug","ts":"2026-03-19T14:41:26.066Z","caller":"gmm/security_mode.go:24","msg":"UE has a valid security context - skip security mode control procedure","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719"}
{"level":"debug","ts":"2026-03-19T14:41:26.066Z","caller":"gmm/reg_initial.go:53","msg":"use original GUTI","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719","guti":"00101cafe001b942001"}
{"level":"info","ts":"2026-03-19T14:41:26.066Z","caller":"logger/logger.go:234","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"InitialContextSetupRequest","direction":"outbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:34221"}
{"level":"info","ts":"2026-03-19T14:41:26.066Z","caller":"message/send.go:367","msg":"Sent NGAP initial context setup request","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719"}
{"level":"info","ts":"2026-03-19T14:41:26.086Z","caller":"logger/logger.go:234","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"InitialContextSetupResponse","direction":"inbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:34221"}
{"level":"info","ts":"2026-03-19T14:41:26.214Z","caller":"logger/logger.go:234","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UplinkNASTransport","direction":"inbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:34221"}
{"level":"debug","ts":"2026-03-19T14:41:26.214Z","caller":"context/amf_ue.go:736","msg":"Decrypt NAS message","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719","algorithm":2,"ULCount":3}
{"level":"info","ts":"2026-03-19T14:41:26.214Z","caller":"nas/handler.go:78","msg":"Received NAS message","component":"AMF","MessageType":"RegistrationComplete","SUPI":"imsi-001010000062719"}
{"level":"info","ts":"2026-03-19T14:41:26.214Z","caller":"message/send.go:460","msg":"Send Configuration Update Command","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719"}
{"level":"info","ts":"2026-03-19T14:41:26.214Z","caller":"logger/logger.go:234","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"DownlinkNasTransport","direction":"outbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:34221"}
{"level":"info","ts":"2026-03-19T14:41:26.214Z","caller":"message/send.go:477","msg":"start T3555 timer","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719"}
{"level":"info","ts":"2026-03-19T14:41:27.620Z","caller":"logger/logger.go:234","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UEContextReleaseRequest","direction":"inbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:34221"}
{"level":"debug","ts":"2026-03-19T14:41:27.620Z","caller":"ngap/handle_ue_context_release_request.go:86","msg":"Handle UE Context Release Request","component":"AMF","ran_addr":"10.202.0.5:34221","AMF_UE_NGAP_ID":"8","AmfUeNgapID":8,"RanUeNgapID":7}
{"level":"info","ts":"2026-03-19T14:41:27.620Z","caller":"ngap/handle_ue_context_release_request.go:99","msg":"UE Context Release Cause","component":"AMF","ran_addr":"10.202.0.5:34221","AMF_UE_NGAP_ID":"8","Cause":"Radio Network: RadioConnectionWithUeLost (21)","supi":"imsi-001010000062719"}
{"level":"info","ts":"2026-03-19T14:41:27.620Z","caller":"ngap/handle_ue_context_release_request.go:110","msg":"Ue Context in GMM-Registered","component":"AMF","ran_addr":"10.202.0.5:34221","AMF_UE_NGAP_ID":"8"}
{"level":"info","ts":"2026-03-19T14:41:27.620Z","caller":"ngap/handle_ue_context_release_request.go:133","msg":"Pdu Session IDs not received from gNB, Releasing the UE Context with SMF using local context","component":"AMF","ran_addr":"10.202.0.5:34221","AMF_UE_NGAP_ID":"8"}
{"level":"info","ts":"2026-03-19T14:41:27.620Z","caller":"logger/logger.go:234","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UEContextReleaseCommand","direction":"outbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:34221"}
{"level":"info","ts":"2026-03-19T14:41:27.757Z","caller":"logger/logger.go:234","msg":"network_event","component":"Network","protocol":"NGAP","message_type":"UEContextReleaseComplete","direction":"inbound","local_address":"10.202.0.3:38412","remote_address":"10.202.0.5:34221"}
{"level":"debug","ts":"2026-03-19T14:41:27.757Z","caller":"ngap/handle_ue_context_release_complete.go:139","msg":"Release UE Context in GMM-Registered","component":"AMF","ran_addr":"10.202.0.5:34221","AMF_UE_NGAP_ID":"8","supi":"imsi-001010000062719"}
{"level":"info","ts":"2026-03-19T14:41:27.757Z","caller":"ngap/handle_ue_context_release_complete.go:161","msg":"Pdu Session IDs not received from gNB, Releasing the UE Context with SMF using local context","component":"AMF","ran_addr":"10.202.0.5:34221","AMF_UE_NGAP_ID":"8"}
{"level":"debug","ts":"2026-03-19T14:41:27.757Z","caller":"context/amf_ue.go:788","msg":"starting mobile reachable timer","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719","SUPI":"imsi-001010000062719"}
{"level":"info","ts":"2026-03-19T14:41:27.757Z","caller":"ngap/handle_ue_context_release_complete.go:181","msg":"Release UE Context: N2 Connection Release","component":"AMF","ran_addr":"10.202.0.5:34221","supi":"imsi-001010000062719"}
{"level":"info","ts":"2026-03-19T14:41:27.757Z","caller":"context/ran_ue.go:90","msg":"ran ue removed","component":"AMF","RanUeNgapID":7}
{"level":"warn","ts":"2026-03-19T14:41:32.216Z","caller":"message/send.go:479","msg":"timer T3555 expired, retransmit Configuration Update Command","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719","retry":1}
{"level":"warn","ts":"2026-03-19T14:41:32.216Z","caller":"message/send.go:482","msg":"UE Context released, abort retransmission of Configuration Update Command","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719"}
{"level":"debug","ts":"2026-03-19T14:41:34.340Z","caller":"upf/upf.go:416","msg":"Deleted expired conntrack entries","component":"UPF","count":0}
{"level":"warn","ts":"2026-03-19T14:41:38.217Z","caller":"message/send.go:479","msg":"timer T3555 expired, retransmit Configuration Update Command","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719","retry":2}
{"level":"warn","ts":"2026-03-19T14:41:38.217Z","caller":"message/send.go:482","msg":"UE Context released, abort retransmission of Configuration Update Command","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719"}
{"level":"warn","ts":"2026-03-19T14:41:44.217Z","caller":"message/send.go:479","msg":"timer T3555 expired, retransmit Configuration Update Command","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719","retry":3}
{"level":"warn","ts":"2026-03-19T14:41:44.217Z","caller":"message/send.go:482","msg":"UE Context released, abort retransmission of Configuration Update Command","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719"}
{"level":"warn","ts":"2026-03-19T14:41:50.215Z","caller":"message/send.go:479","msg":"timer T3555 expired, retransmit Configuration Update Command","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719","retry":4}
{"level":"warn","ts":"2026-03-19T14:41:50.215Z","caller":"message/send.go:482","msg":"UE Context released, abort retransmission of Configuration Update Command","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719"}
{"level":"warn","ts":"2026-03-19T14:41:56.215Z","caller":"message/send.go:498","msg":"timer T3555 expired too many times, aborting configuration update procedure","component":"AMF","AMF_UE_NGAP_ID":"AMF_UE_NGAP_ID:8","supi":"imsi-001010000062719","maximum retries":4}

Any idea on this?

[gruyaume]

The gNB reports it lost the radio connection to the UE almost immediately after registration (RadioConnectionWithUeLost). It seems like the same issue as you reported earlier between the radio and the UE.

[gruyaume]

Hello @fllay , I acquired a Samsung Galaxy A56 (SM-A566W) to reproduce this problem and I'm pretty sure I identified the root cause: the phone silently stop communicating with the network if the network does not claim to support IMS-VoPS as one if its features during initial context setup.

I added the IMS-VoPS flag in #1157. Now the device correctly connects to the network.

You can try again with main and your phone should connect.

Screenshots

[fllay]

I can confirm that now the 5G core works for both Samsung A55 and A33. I cannot go to the internet but I think it a NAT issue. I will look at it tomorrow it is late here. Thank you very much for your help. BTW I have a question for ocudu. Now the project moved to gitlab but gitlab has no discussion. How can we participate? I feel disconnected.

[gruyaume]

For your user plane issue, if you use veth with native XDP, make sure to follow this guide.

As for the OCUDU community, I asked a similar question here and as far as I know they don't have an equivalent forum at the moment.