UE no longer connects with latest srsRAN 5G (Benetel RU v1.0.4) — works on May build

[ujjwalpawar]

Hi team,

After updating to the latest srsRAN_5G (current main as of this week), our UE no longer connects. The exact same setup and config work reliably on a build from May.

RU / split: Benetel RU v1.0.4 (O-RAN 7.2)
DU/CU: srsRAN 5G (RU OFH + gnb), standalone core
OS: Ubuntu 22.04
Bandwidth / band: n77, 100 MHz, SCS 30 kHz
Antennas: 4x4 MIMO
Fronthaul: DPDK (EAL args below)
UE can see the cell but never does the RACH successfully (no uplink activity at RU side)
On the latest build, RU-side counters (e.g., RX_TOTAL / RX_ON_TIME) are consistently lower than on the May build under configuration

UE logs

RU logs with latest version

RU logs with may version

Configuration (works on May build, fails on latest)

cu_cp:
  amf:
    addr: 172.30.129.35
    port: 38412
    bind_addr: 10.0.0.3
    supported_tracking_areas:
      - tac: 1
        plmn_list:
          - plmn: "99999"
            tai_slice_support_list:
              - sst: 1

ru_ofh:
  t1a_max_cp_dl: 535
  t1a_min_cp_dl: 286
  t1a_max_cp_ul: 535
  t1a_min_cp_ul: 286
  t1a_max_up: 390
  t1a_min_up: 80
  ta4_max: 500
  ta4_min: 25
  is_prach_cp_enabled: false
  compr_method_ul: bfp
  compr_bitwidth_ul: 9
  compr_method_dl: bfp
  compr_bitwidth_dl: 9
  compr_method_prach: bfp
  compr_bitwidth_prach: 9
  enable_ul_static_compr_hdr: true
  enable_dl_static_compr_hdr: true
  iq_scaling: 5.5
  cells:
    - network_interface: 0000:86:01.0
      ru_mac_addr: 70:b3:d5:e1:5f:e9
      du_mac_addr: 00:11:22:33:77:88
      vlan_tag_cp: 11
      vlan_tag_up: 11
      prach_port_id: [4,5,6,7]
      dl_port_id: [0, 1,2,3]
      ul_port_id: [0, 1,2,3]

cell_cfg:
  dl_arfcn: 660000
  band: 77
  channel_bandwidth_MHz: 100
  common_scs: 30
  plmn: "99999"
  tac: 1
  pci: 11
  nof_antennas_dl: 4
  nof_antennas_ul: 4
  prach:
    prach_config_index: 7
    prach_root_sequence_index: 11
    zero_correlation_zone: 0
    prach_frequency_start: 0
    preamble_trans_max: 4
  ssb:
    ssb_block_power_dbm: 0
  tdd_ul_dl_cfg:
    dl_ul_tx_period: 10
    nof_dl_slots: 7
    nof_dl_symbols: 6
    nof_ul_slots: 2
    nof_ul_symbols: 4

hal:
  eal_args: "--lcores (0-1)@(2-55) -a 0000:86:01.0"

expert_phy:
  allow_request_on_empty_uplink_slot: false

log:
  filename: stdout
  all_level: warning
  config_level: debug

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