Have trouble setup srsRAN gnb with COT UE (OnePlus Nord 5G)

[qiqingh]

Issue Description

Hello

I followed the tutorial "srsRAN gNB with COTS UEs" in the link: https://docs.srsran.com/projects/project/en/latest/tutorials/source/cotsUE/source/index.html

I am using a OnePluss Nord5G 8T. I observed that the UE is able to detect the RAN sometimes(very few), but it cannot attach.

Setup Details

Machine: Intel(R) Core(TM) i7-1260P X16 Ubuntu 20.04.6 LTS
srsRAN Project branch origin/main
B210 USRP
Open5GS 5G Core
OnePlus Nord 5G 8T KB2005
External GPSDO
UHD 3.15.0

Expected Behavior

I expect the UE to connect with the gNB

Actual Behaviour

The UE doesn't start with the connection.

Steps to reproduce the problem

I totally followed the tutorial, using the amf.yaml, upf.yaml and gnb_b210_20MHz_oneplus_8t.yml provided

Additional Information

The screen I saw from the oneplus UE:

The gnb.log has following output:

2024-01-28T16:01:23.133105 [FAPI    ] [W] [   185.2] Real-time failure in FAPI: Received late DL_TTI.request from slot 185.1
2024-01-28T16:02:05.772048 [FAPI    ] [W] [  342.18] Real-time failure in FAPI: Received late UL_TTI.request from slot 342.17
2024-01-28T16:02:07.252069 [RF      ] [W] Real-time failure in RF: underflow
2024-01-28T16:02:17.518528 [FAPI    ] [W] [  493.10] Real-time failure in FAPI: Received late UL_TTI.request from slot 493.9
2024-01-28T16:02:18.429573 [FAPI    ] [W] [  584.11] Real-time failure in FAPI: Received late DL_TTI.request from slot 584.10
2024-01-28T16:02:18.429599 [FAPI    ] [W] [  584.11] Real-time failure in FAPI: Received TX_Data.request from slot 584.10
2024-01-28T16:02:18.429617 [RF      ] [W] Real-time failure in RF: underflow
2024-01-28T16:02:21.311991 [RF      ] [W] Real-time failure in RF: underflow
2024-01-28T16:02:22.254963 [RF      ] [W] Real-time failure in RF: underflow
2024-01-28T16:02:33.226006 [FAPI    ] [W] [    16.4] Real-time failure in FAPI: Received late DL_TTI.request from slot 16.3
2024-01-28T16:02:39.293195 [FAPI    ] [W] [  622.18] Real-time failure in FAPI: Received late UL_TTI.request from slot 622.17
2024-01-28T16:02:55.474450 [FAPI    ] [W] [  192.19] Real-time failure in FAPI: Received late UL_TTI.request from slot 192.18
2024-01-28T16:02:56.677285 [RF      ] [W] Real-time failure in RF: underflow
2024-01-28T16:02:57.254277 [RF      ] [W] Real-time failure in RF: underflow
2024-01-28T16:02:58.257362 [RF      ] [W] Real-time failure in RF: underflow
2024-01-28T16:02:58.257715 [FAPI    ] [W] [   471.4] Real-time failure in FAPI: Received late DL_TTI.request from slot 471.3
2024-01-28T16:02:58.257721 [FAPI    ] [W] [   471.5] Real-time failure in FAPI: Received late DL_TTI.request from slot 471.4
2024-01-28T16:02:58.483836 [RF      ] [W] Real-time failure in RF: underflow
2024-01-28T16:02:58.484402 [FAPI    ] [W] [  493.18] Real-time failure in FAPI: Received late DL_TTI.request from slot 493.16
2024-01-28T16:02:58.484415 [FAPI    ] [W] [  493.18] Real-time failure in FAPI: Received late UL_TTI.request from slot 493.17
2024-01-28T16:02:59.079863 [RF      ] [W] Real-time failure in RF: underflow
2024-01-28T16:02:59.080115 [FAPI    ] [W] [  553.10] Real-time failure in FAPI: Received late UL_TTI.request from slot 553.8
2024-01-28T16:02:59.080126 [FAPI    ] [W] [  553.10] Real-time failure in FAPI: Received late UL_TTI.request from slot 553.9
2024-01-28T16:02:59.255867 [RF      ] [W] Real-time failure in RF: underflow
2024-01-28T16:02:59.682467 [RF      ] [W] Real-time failure in RF: underflow
2024-01-28T16:03:00.008923 [RF      ] [W] Real-time failure in RF: underflow
2024-01-28T16:03:00.251962 [RF      ] [W] Real-time failure in RF: underflow
2024-01-28T16:03:32.707264 [Low-PHY#0] [W] Real-time failure in low-phy: PRACH request late for sector 0, slot 843.19 and start symbol 0.

[yagoda]

Hi,

Have you ran the srsran_performance script?

[qiqingh]

@yagoda yes, I do run this script.

[meenaresh19]

Is 311490 configured by you in SRS RAN config file?
Doesn't look like. What is the PLMN (MCC and MNC) configured in SRS RAN config file?
Are you using configured ISIM?

[qiqingh]

@meenaresh19
Hello, may I know what is 311490? I use the config file: https://docs.srsran.com/projects/project/en/latest/_downloads/cc142413003e87e53c16e0b63203ac57/gnb_b210_20MHz_oneplus_8t.yml as mentioned in the tutorial

The PLMN is 90170, And I use the 00101 for the sim card.

For the sim card, I used sysmoISIM-SJA2, I followed the instruction for the sim programming secrtion and also disabled the UST service 124 and 125.

May I know how to verify that the sim card is successfully programmed?

[meenaresh19]

I believe 311 490 is T-Mobile network.
I think your mobile is not detecting the PLMN network of your SDR(srsRAN + B210), which is 90170.
I am also facing the same issue.

[qiqingh]

@meenaresh19 Thanks for your illustration. I think maybe the "Real-time failure in RF: underflow" revealed in the gNB.log would be the issue.

[pgawlowicz]

@qiqingh Hi, any progress/update on this issue?

[ff187]

Dear @qiqingh ,

Please make sure you have configured the amf, upf with the following configuration: IMSI 00101, gNB PLMN 90170. According the "Tested COTS UEs"- OnePlus Nord 5G was tested in a shielded box. Moreover, few of the phones does not work well with TDD band. If you are working in a chamber then you can try some other FDD band instead just to make sure the network is visible to the phone. Thank you.

[Moussa-Guemdani]

@meenaresh19 Thanks for your illustration. I think maybe the "Real-time failure in RF: underflow" revealed in the gNB.log would be the issue.

Hello, Any solution for this issue?

Thank you