COTS UE cannot see the LTE network

[sj5298]

Issue Description

Hi all,

I run sudo srsepc and sudo srsenb, the eNB and ePC are connected but the corresponding network cannot be found using COTS UE (Samsung Galaxy Note 3 Neo). I am aware that the phone I used supports LTE band 8, so I have used the DL_EARFCN in the range from 3450 to 3790. I have changed the value of DL_EARFCN but it does not work. I have added the APN to my phone (according to here) but still couldn't see the network.

Setup Details

My setup was listed as follows: 1x Raspberry pi as eNB 1x laptop with ubuntu 20.04 LTS running ePC and remotely controlled eNB via PUTTY 1x USRP B210 connect to raspberry pi 1x COTS UE (Samsung Galaxy Note 3 Neo)

Expected Behavior

COTS UE could find the LTE network at 925MHz and connect it.

Actual Behaviour

COTS UE couldn't find the network.

Additional Information

enb.txt epc.txt user_db.txt USIM card details.txt

I hope someone can give me a solution to this problem.

Thanks.

[zikkuratti]

kernel version plz?

[sj5298]

kernel version plz?

Hi zikkuratti,

The kernel version of laptop (EPC): Linux seah-X450LD 5.15.0-60-generic #66-Ubuntu SMP Fri Jan 20 14:29:49 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

The kernel version of Raspberry Pi(eNB): Linux ubuntu 5.4.0-1080-raspi #91-Ubuntu SMP PREEMPT Thu Jan 19 09:35:03 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux

[bedrankara]

After quickly checking the Samsung Galaxy Neo 3 specs, it seems like it does not support LTE ?

[sj5298]

After quickly checking the Samsung Galaxy Neo 3 specs, it seems like it does not support LTE ?

It supported 4G LTE referring this website

I did also tried with Samsung note 10 lite. Still couldn't see the LTE network.

[mrahman2-vt]

Hi there, I would like to implement a scenario with CU DU split mode in Raspberry Pi, and my propagation delay between CU and DU is quite large, say for example 6ms. I think the RACH procedure will fail because of this huge delay. Is there any way I can modify the RACH procedure? If so, can you please guide me on exactly what I need to make those changes?

Regards

MdMahfuzur Rahman (Mahfuz)

+1-906-281-8261

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Message ID: @.***>

[zikkuratti]

@sj5298 saw some troubles on PREEMT try to patch on PREEMT_RT dont ask how) work on same problem for arm64 device

[dufffffy]

Did you solve the problem? I met the same with you.

[NagaJayaPraveen]

HI, this is praveen.

I have been trying to Download and build srsRAN 4G in ubuntu server, rasberry pi 4 device , but getting failure errors. please find the attached code

git clone https://github.com/srsRAN/srsRAN_4G.git cd srsRAN_4G mkdir build cd build cmake ../ make make test

Here is the error message:

error message:

error: ‘void* __builtin_memmove(void*, const void*, long unsigned int)’ forming offset 36 is out of the bounds [0, 36] [-Werror=array-bounds=] 437 | __builtin_memmove(__result, __first, sizeof(_Tp) * _Num); | ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1plus: all warnings being treated as errors

could you help me on this!

Thanks, Praveen