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

[Andre Puschmann]

Hi Arthur,

On 19/3/20 16:42, Arthur Gassner wrote:
> 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`.

Everything looks good. The eNB releases your connection if you don't do
any traffic. That's normal.

Just start traffic, i.e. run a "ping 10.95.110.1" or do an iperf.


Thanks
Andre


> 
> 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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