[srslte-users] Issue related to srsUE Phy synch and latching onto RRC Idle

Darshan Joshi djoshi at terpmail.umd.edu
Sat Feb 24 14:50:18 UTC 2018


Hello everyone,

We students at University of Maryland are trying to implement srsUE to
srsEPC connection using two USRP B210 SDRs (one as srsUE and another one as
srsENB).

We successfully managed to ping from UE to EPC but it's not consistent. We
are constantly facing following issues:
1) srsUE remain in the IDLE mode and logs show Synch error. T310 getting
expired and hence radio link failure.
2) We observed :USRP B210 "UHD Error: recv packet demuxer unexpected sid"
following which stack crashes with srsLTE.backtrace.crash

Any guidance or places where we can focus to optimize the code would be of
great help. Attached are UE, eNodeB and EPC logs.

Note: Our goal is to do video transmission from EPC to UE once data bearer
has eastablished.

Thank you all for the help!
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