[srslte-users] Commercial UE Attach problems

[Pilz, Jens]

Hi all,

i got everything working on a basic level: OpenEPC 6 -> srsLTE -> USRP x310 -> Antenna -> Rohde & Schwarz FSW13
When I try to attach commercial UE with working sim card (setup is verified with different eNB on same core network),
I see a lot of rnti created in srsENB:
RACH:  tti=7321, preamble=17, offset=0, temp_crnti=0x46
RACH:  tti=7411, preamble=13, offset=0, temp_crnti=0x47
SCHED: Could not transmit RAR within the window (RA TTI=7411, Window=10, Now=7428)
RACH:  tti=7431, preamble=28, offset=0, temp_crnti=0x48
Disconnecting rnti=0x47.
RACH:  tti=7521, preamble=2, offset=0, temp_crnti=0x49
SCHED: Could not transmit RAR within the window (RA TTI=7521, Window=10, Now=7541)
RACH:  tti=7541, preamble=14, offset=0, temp_crnti=0x4a
Disconnecting rnti=0x49.
RACH:  tti=7631, preamble=38, offset=0, temp_crnti=0x4b
Disconnecting rnti=0x46.
Disconnecting rnti=0x48.
Disconnecting rnti=0x4b.
Disconnecting rnti=0x4a.
RACH:  tti=8451, preamble=21, offset=0, temp_crnti=0x4c
Disconnecting rnti=0x4c.
RACH:  tti=9931, preamble=38, offset=0, temp_crnti=0x4d
Disconnecting rnti=0x4d.
RACH:  tti=10021, preamble=38, offset=0, temp_crnti=0x4e
Disconnecting rnti=0x4e.
RACH:  tti=10001, preamble=26, offset=0, temp_crnti=0x4f
Disconnecting rnti=0x4f.
RACH:  tti=1251, preamble=26, offset=0, temp_crnti=0x50
Disconnecting rnti=0x50.

This can be easily reproduced and linked to commercial LTE USB Dongle (Huawei E392).
I also attached eNB log.
In my opinion, one UE should only create one RACH?!?

Also there is some misbehavior in MME, but I thing this is correlated to so many "RNTI" created.

Regards,
Jens


--
Dipl.-Phys. Jens Pilz
Project Manager

Fraunhofer Heinrich Hertz Institute HHI
Wireless Communications and Networks Department
Einsteinufer 37, 10587 Berlin, Germany
phone + 49 30 31002 390 | mobile + 49 179 1497494
email jens.pilz at hhi.fraunhofer.de
www.hhi.fraunhofer.de<http://www.hhi.fraunhofer.de> | Facebook<https://www.facebook.com/FraunhoferHHI1928> | Twitter<https://twitter.com/FraunhoferHHI>

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