[srslte-users] SRS UE connecting to commercial network

Mon Jun 24 12:52:52 UTC 2019

Hello Ismael,

Thank you for notifying me and noticing the bug. I compiled the code and
tested it. There is huge improvement in the detection of the PLMN. However,
issue still persists.

1) I did execute the Pdsch option first for a clean signal. It does. Next,
the code does not detect the PLMN automatically.
2) I changed the PLMN code to a number which eNB is configured. i.e 24451.
It detects the code. However, it looks for HPLMN. Since, it is not there,
it tries to connect via existing PLMN and it fails (I am assuming it looks
for the equivalent HPLMN next). Here, it fails.  PS: I changed the details
in the ue.conf.example and nas_test.cc file

In nas.c file,
    nas_log->error("Getting Home PLMN Id from USIM. Defaulting to
001-01\n");
    uint16_t mcc          = 61441; // This is 001
    uint16_t mnc          = 65281; // This is 01

How is this encoded? I suspect this triggers the default one. How can I
code it?

*Attached are the logs for your reference:*
*1. ue_original.log (Without modifying PLMN code)*
* 2. ue.log (Modifying PLMN code). *

*Here's the output at the Terminal: *

ubuntu at ubuntu-Zephyrus-GX501GI:~/srsLTE-issuefix_format1c/build$ srsue
--rf.dl_earfcn 2875 --log.all_level=info
Reading configuration file /home/ubuntu/.config/srslte/ue.conf...

Built in Release mode using 19.3.0.

---  Software Radio Systems LTE UE  ---

Opening 1 RF devices with 1 RF channels...
[INFO] [UHD] linux; GNU C++ version 7.4.0; Boost_106501;
UHD_3.15.0.git-1-gf83faf28
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Opening USRP with args: type=x300,master_clock_rate=184.32e6
[INFO] [X300] X300 initialization sequence...
[INFO] [X300] Maximum frame size: 1472 bytes.
[INFO] [X300] Radio 1x clock: 184.32 MHz
[INFO] [GPS] Found an internal GPSDO: LC_XO, Firmware Rev 0.929a
[INFO] [0/DmaFIFO_0] Initializing block control (NOC ID: 0xF1F0D00000000000)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1300 MB/s)
[INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1303 MB/s)
[INFO] [0/Radio_0] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/Radio_1] Initializing block control (NOC ID: 0x12AD100000000001)
[INFO] [0/DDC_0] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DDC_1] Initializing block control (NOC ID: 0xDDC0000000000000)
[INFO] [0/DUC_0] Initializing block control (NOC ID: 0xD0C0000000000000)
[INFO] [0/DUC_1] Initializing block control (NOC ID: 0xD0C0000000000000)
Waiting PHY to initialize...
Warning: Failed to create thread with real-time priority. Creating it with
normal priority: Success
Warning: Failed to create thread with real-time priority. Creating it with
normal priority: Success
Warning: Failed to create thread with real-time priority. Creating it with
normal priority: Success
Warning: Failed to create thread with real-time priority. Creating it with
normal priority: Success
...
Attaching UE...
Searching cell in DL EARFCN=2875, f_dl=2632.5 MHz, f_ul=2512.5 MHz
.
Found Cell:  Mode=FDD, PCI=12, PRB=25, Ports=2, CFO=-0.3 KHz
Found PLMN:  Id=24451, TAC=12594
Could not find Home PLMN Id=00101, trying to connect to PLMN Id=24451
Random Access Transmission: seq=30, ra-rnti=0x2
Random Access Complete.     c-rnti=0x3d7, ta=4
Received ConnectionReject. Wait time: 8
Random Access Transmission: seq=3, ra-rnti=0x2
Received ConnectionReject. Wait time: 8
Random Access Complete.     c-rnti=0x9fa6, ta=4
Random Access Transmission: seq=27, ra-rnti=0x2
Received ConnectionReject. Wait time: 8
Random Access Complete.     c-rnti=0x3b75, ta=4
Random Access Transmission: seq=16, ra-rnti=0x2
Received ConnectionReject. Wait time: 8
Random Access Complete.     c-rnti=0xd744, ta=0
Random Access Transmission: seq=0, ra-rnti=0x2
Received ConnectionReject. Wait time: 8
Random Access Complete.     c-rnti=0x7313, ta=4

Regards,
Saimanoj

On Fri, Jun 21, 2019 at 7:15 PM Ismael Gomez <
ismael.gomez at softwareradiosystems.com> wrote:

> Hi Saimanoj,
>
> Thanks for reporting this. This is indeed a bug in resolving RV value for
> Format1C for SI-RNTI. Thanks for catching that. I've pushed a new branch
> with a possible fix here:
> https://github.com/srsLTE/srsLTE/tree/issuefix_format1c
>
> When you have a chance, could you please try it again and let us know if
> it works? ue.log would be very useful.
>
> Thanks
>
> On Fri, 21 Jun 2019 at 13:55, Saimanoj Katta <saimanoj.katta at cumucore.com>
> wrote:
>
>> Hello Andre,
>>
>> Sorry for the late reply. I get a clean signal when I execute pdsch_ue as
>> you advised me to check.
>> When I run srsue, it even detects a cell, but, the index values start to
>> appear and the error keeps happening-
>>
>> Found Cell:  Mode=FDD, PCI=12, PRB=25, Ports=2, CFO=0.3 KHz
>> Invalid inputs rv_idx=-1, cb_idx=15
>> /home/ubuntu/srsLTE/lib/src/phy/phch/sch.c.343: Error in rate matching
>> .
>> .
>> .
>> Invalid inputs rv_idx=-1, cb_idx=15
>> /home/ubuntu/srsLTE/lib/src/phy/phch/sch.c.343: Error in rate matching
>>
>> ^Z
>> [7]+  Stopped                 srsue --rf.dl_earfcn 2875
>> --log.all_level=info
>>
>> It always, asks MAC to look for SIB1(Attached are the logs). In eNB
>> configuration, S1B1 is not configured. To configure it in eNB, it takes a
>> huge time, I understand. Is it easier to disable it in the code and start
>> working to recieve SIB2?  I am a beginner to this platform and I am
>> confused, what to do next.
>>
>> Regards,
>> Saimanoj
>>
>> On Fri, Jun 14, 2019 at 3:18 PM Andre Puschmann <
>> andre.puschmann at softwareradiosystems.com> wrote:
>>
>>> You don't need to configure anything at the UE side. It detects
>>> everything automatically.
>>>
>>> Try pdsch_ue if you have issues with the UE and make sure you can
>>> receive a clean signal.
>>>
>>> Cheers
>>> Andre
>>>
>>> On 11/6/19 16:04, Saimanoj Katta wrote:
>>> > Hi,
>>> >
>>> > I have attached the logs. I analyzed and realized this: The PLMN which
>>> I
>>> > have given is not detected by the code. Furthermore, the SIB1 is not
>>> > detected. There needs to be decoding of MIB to connect, right? Do I
>>> need
>>> > to change something from expert config options?
>>> >
>>> > Further, In the README file, it says, it has been tested for
>>> bandwidths:
>>> > 1.4, 3, 5, 10, 15 and 20 MHz. I assume this is the channel bandwidth
>>> and
>>> > I need it for 20MHz. From one of the papers, I remember the srsLTE code
>>> > is set to 20MHz. How do I change it? I was not able to decode.
>>> >
>>> > Regards,
>>> > manu
>>>
>>>
>>> --
>>> Andre Puschmann
>>>
>>> Software Radio Systems (SRS)
>>> http://www.softwareradiosystems.com
>>>
>>> PGP/GnuPG key: 6C42AB31
>>> fingerprint: 137A AE49 785B A445 257C 8AD7 D877 A498 6C42 AB31
>>>
>> _______________________________________________
>> srslte-users mailing list
>> srslte-users at lists.softwareradiosystems.com
>> http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
>>
>
>
> --
> Ismael Gomez Ph.D.
>
> Software Radio Systems (SRS)
> http://www.softwareradiosystems.com
>
> ismael.gomez at softwareradiosystems.com
>
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