[srslte-users] [srsUE with commercial eNodeB] srsUE disconnects after successful Network attach

[Arthur Gassner]

Good afternoon everyone,

I am trying to connect my SDR to a commercial eNodeB to record the channel
estimates computed in ue_dl.c.

I am using Ubuntu 16.04 with a USRP B200mini and an external SIM plugged
through a PCSC.

By running sudo srsue, I manage to attach to the network, but within 5s I
get disconnected.

Right after that, the srsGUI freezes, the trace shows the srsUE as* ---
disconnected ---* and I'm unable to reconnect to my original eNodeB.

Is there any way to prevent this and maintain the connection to the
original eNodeB?
Below the output of `sudo srsue ue.conf`.

Thanks for your help and time,
Kind regards,
Arthur Gassner

> sudo srsue ue.conf.example

Reading configuration file ue.conf.example...

Built in Release mode using commit d045213 on branch master.

Opening 1 RF devices with 1 RF channels...
[INFO] [UHD] linux; GNU C++ version 5.4.0 20160609; Boost_105800;
UHD_3.15.0.0-release
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Opening USRP with args: type=b200,master_clock_rate=23.04e6
[INFO] [B200] Detected Device: B200mini
[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] Asking for clock rate 23.040000 MHz...
[INFO] [B200] Actually got clock rate 23.040000 MHz.
Waiting PHY to initialize ... done!
Attaching UE...
Starting plot for worker_id=0
Searching cell in DL EARFCN=6300, f_dl=806.0 MHz, f_ul=847.0 MHz
.
Found Cell:  Mode=FDD, PCI=307, PRB=50, Ports=2, CFO=2.4 KHz
Found PLMN:  Id=22801, TAC=4040
Random Access Transmission: seq=11, ra-rnti=0x8
Random Access Complete.     c-rnti=0x2a3b, ta=4
RRC Connected
Network attach successful. IP: 10.95.110.139
E
t
Enter t to stop trace.

--------Signal--------------DL-------------------------------------UL----------------------
cc pci  rsrp    pl    cfo   mcs   snr turbo  brate   bler   ta_us  mcs
buff  brate   bler
 0 307   -56    70   2.5k  0.14    20  0.50    144     0%   2.1    22
 0.0    23k     0%
 0 307   -56    70   2.5k  0.65    20  0.50    112     0%   2.1    22
 0.0    24k     0%
 0 307   -58    72   2.5k  0.41    20  0.50    112     0%   2.1    22
 0.0    25k     0%
 0 307   -58    72   2.5k  0.25    20  0.50    144     0%   2.1    22
 0.0    24k     0%
Received RRC Connection Release
RRC IDLE
Selected cell: {cell_id: 0x0, pci: 482, dl_earfcn: 6300}

Selected cell: {cell_id: 0x0, pci: 344, dl_earfcn: 6300}

Selected cell: {cell_id: 0x0, pci: 79, dl_earfcn: 6300}

Selected cell: {cell_id: 0x1014b04, pci: 307, dl_earfcn: 6300}

Selected cell: {cell_id: 0x0, pci: 482, dl_earfcn: 6300}

Selected cell: {cell_id: 0x0, pci: 344, dl_earfcn: 6300}

--- disconnected ---
Selected cell: {cell_id: 0x0, pci: 79, dl_earfcn: 6300}

--- disconnected ---
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