[srslte-users] NAS Authentication Failure with COTS UE & B210

[So Randomem]

Dear srsRAN Support Team,

I am following the srsRAN official guideline, COTS UE Application Note (
https://docs.srsran.com/en/latest/app_notes/source/cots_ue/source/index.html#cots-ue-application-note),
in order to connect my phone (UE) to my PC (srsEPC & srsENB). However, it
seems like my phone is failing to respond to the NAS Authentication request
sent by MME as the log shows that srsEPC releases UE after sending the NAS
Authentication request. Following is some information that might be useful
for you to understand my setup.

1. UE / phone: LG X4 w/ a programmable sim card written with following
parameters-ue1,mil,901700000020936,4933f9c5a83e5718c52e54066dc78dcf,opc,fc632f97bd249ce0d16ba79e6505d300,9000,000000000000,9,dynamic

2. srsENB: USRP B210 w/ four VERT 2450 antennas
3. srsEPC: PC w/ Ubuntu 20.04

4. log from srsEPC:
Built in Release mode using commit 89f16eed2 on branch master.


---  Software Radio Systems EPC  ---

Reading configuration file /root/.config/srsran/epc.conf...
HSS Initialized.
MME S11 Initialized
MME GTP-C Initialized
MME Initialized. MCC: 0xf901, MNC: 0xff70
SPGW GTP-U Initialized.
SPGW S11 Initialized.
SP-GW Initialized.
Received S1 Setup Request.
S1 Setup Request - eNB Name: srsenb01, eNB id: 0x19b
S1 Setup Request - MCC:901, MNC:70
S1 Setup Request - TAC 7, B-PLMN 0x9f107
S1 Setup Request - Paging DRX v128
Sending S1 Setup Response
Initial UE message: LIBLTE_MME_MSG_TYPE_ATTACH_REQUEST
Received Initial UE message -- Attach Request
Attach request -- IMSI: 901700000020936
Attach request -- eNB-UE S1AP Id: 1
Attach request -- Attach type: 2
Attach Request -- UE Network Capabilities EEA: 11100000
Attach Request -- UE Network Capabilities EIA: 01100000
Attach Request -- MS Network Capabilities Present: true
PDN Connectivity Request -- EPS Bearer Identity requested: 0
PDN Connectivity Request -- Procedure Transaction Id: 1
PDN Connectivity Request -- ESM Information Transfer requested: false
Downlink NAS: Sending Authentication Request
Initial UE message: LIBLTE_MME_MSG_TYPE_ATTACH_REQUEST
Received Initial UE message -- Attach Request
Attach request -- IMSI: 901700000020936
Attach request -- eNB-UE S1AP Id: 2
Attach request -- Attach type: 2
Attach Request -- UE Network Capabilities EEA: 11100000
Attach Request -- UE Network Capabilities EIA: 01100000
Attach Request -- MS Network Capabilities Present: true
PDN Connectivity Request -- EPS Bearer Identity requested: 0
PDN Connectivity Request -- Procedure Transaction Id: 2
PDN Connectivity Request -- ESM Information Transfer requested: false
Attach Request -- Found previously attach UE.
Downlink NAS: Sending Authentication Request
^CStopping ..
Deleting eNB context. eNB Id: 0x19b
Deleting UE EMM context. IMSI: 901700000020936

5. log from srsENB:
---  Software Radio Systems LTE eNodeB  ---

Reading configuration file /root/.config/srsran/enb.conf...
WARNING: cpu0 scaling governor is not set to performance mode. Realtime
processing could be compromised. Consider setting it to performance mode
before running the application.

Built in Release mode using commit 89f16eed2 on branch master.

Opening 1 channels in RF device=default with args=default
[INFO] [UHD] linux; GNU C++ version 9.3.0; Boost_107100;
UHD_3.15.0.0-release
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Opening USRP channels=1, args: type=b200,master_clock_rate=23.04e6
[INFO] [UHD RF] RF UHD Generic instance constructed
[INFO] [B200] Detected Device: B210
[INFO] [B200] Operating over USB 3.
[INFO] [B200] Initialize CODEC control...
[INFO] [B200] Initialize Radio control...
[INFO] [B200] Performing register loopback test...
[INFO] [B200] Register loopback test passed
[INFO] [B200] Performing register loopback test...
[INFO] [B200] Register loopback test passed
[INFO] [B200] Asking for clock rate 23.040000 MHz...
[INFO] [B200] Actually got clock rate 23.040000 MHz.
Setting frequency: DL=2680.0 Mhz, UL=2560.0 MHz for cc_idx=0 nof_prb=50

==== eNodeB started ===
Type <t> to view trace
RACH:  tti=1131, cc=0, preamble=35, offset=1, temp_crnti=0x46
RACH:  tti=671, cc=0, preamble=41, offset=1, temp_crnti=0x47


Any insight would be greatly appreciated! If any of you had the same issue
before, please let me know how you dealt with this problem. Thanks a lot in
advance for your assistance.

Best,
So
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