[srslte-users] Commercial UE Attach problems

[Ismael Gomez]

1) You can not set nof_phy_threads bigger than 3. Only 1, 2 o 3 are valid.
2) I think the TX/RX offset is not properly calibrated for the X300. Can
you try setting rf.time_adv_nsamples=18
3) Your signal does not look very good. Make sure TX and RX antennas are
orthogonal and correct for your band
4) Make sure you adjust the PUSCH/PUCCH power control settings in sib.conf
according to your TX power

On Tue, 14 Nov 2017 at 14:30 Pilz, Jens <jens.pilz at hhi.fraunhofer.de> wrote:

> 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 <+49%2030%2031002390> | mobile + 49 179 1497494
> <+49%20179%201497494>
>
> email jens.pilz at hhi.fraunhofer.de
>
> www.hhi.fraunhofer.de | Facebook
> <https://www.facebook.com/FraunhoferHHI1928> | Twitter
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>
>
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