[srslte-users] Connection Reestablishment

Thu Jul 16 10:39:56 UTC 2020

Hello Andre,

I have modified the ADRV reference design to support timestamping. I have
hardware timestamps on the RX and I can send timed frames on the TX, they
are tested and working fine.
I want to know if there is any other issue that can cause this instability.
As far as I can see from the logs, the downlink channel becomes garbage
after a while. UE loses synchronicity and the connection reestablishment
happens successfully a few times.

Best Regards,
Samie

On Thu, Jul 16, 2020 at 12:18 PM Andre Puschmann <
andre.puschmann at softwareradiosystems.com> wrote:

> Hey,
>
> the question has been answered multiple times on the list and on Github.
> Please use the search function.
>
> Bottom line is that the public release doesn't work on ADRV SDRs because
> the driver doesn't support time stamping.
>
> You may get a connection if all works well but it won't be stable, as
> you've experienced yourself.
>
> Cheers
> Andre
>
>
>
> On 15/7/20 16:06, Samie Mostafavi wrote:
> >
> > Hi,
> >
> > I am working on a srsENB - srsUE setup with the latest released version:
> > 20_04_1. I have my modified ADRV SDRs working with Soapy driver and I
> > want to run the system on 6 PRBs.
> > The problem is that the UE connects to Enb successfully and it can
> > maintain the connection for 10-20 seconds. But after that ping
> > doesnt work and connection reestablishment happens. It seems that the
> > channel quality drops over time and I dont know why. I dont have lates,
> > drops or whatever in the ADRV driver.
> > The logs from UE and ENB are attached.
> > UE console:
> >
> > Found Cell:  Mode=FDD, PCI=1, PRB=6, Ports=1, CFO=0.8 KHz
> > [SoapyAdrv][setSampleRate] RX SamplingRate set to  1920000
> > [SoapyAdrv][setSampleRate] TX SamplingRate set to  1920000
> > Setting manual TX/RX offset to 0 samples
> > Found PLMN:  Id=00101, TAC=7
> > [INFO] Activating the tx stream
> > [INFO] tx_streamer start streaming
> > Random Access Transmission: seq=25, ra-rnti=0x2
> > Random Access Transmission: seq=2, ra-rnti=0x2
> > Random Access Transmission: seq=51, ra-rnti=0x2
> > Random Access Transmission: seq=21, ra-rnti=0x2
> > Random Access Transmission: seq=57, ra-rnti=0x2
> > Random Access Transmission: seq=9, ra-rnti=0x2
> > Random Access Transmission: seq=11, ra-rnti=0x2
> > Random Access Transmission: seq=45, ra-rnti=0x2
> > Random Access Transmission: seq=6, ra-rnti=0x2
> > Random Access Transmission: seq=54, ra-rnti=0x2
> > Warning: Detected Radio-Link Failure
> > Warning: Detected Radio-Link Failure
> > [SoapyAdrv][setSampleRate] RX SamplingRate set to  1920000
> > [SoapyAdrv][setSampleRate] TX SamplingRate set to  1920000
> > Setting manual TX/RX offset to 0 samples
> > Found Cell:  Mode=FDD, PCI=1, PRB=6, Ports=1, CFO=0.8 KHz
> > [SoapyAdrv][setSampleRate] RX SamplingRate set to  1920000
> > [SoapyAdrv][setSampleRate] TX SamplingRate set to  1920000
> > Setting manual TX/RX offset to 0 samples
> > Found PLMN:  Id=00101, TAC=7
> > Random Access Transmission: seq=10, ra-rnti=0x2
> > Random Access Complete.     c-rnti=0x4d, ta=852
> > RRC Connected
> > Network attach successful. IP: 172.16.0.2
> > Software Radio Systems LTE (srsLTE)
> > Scheduling request failed: releasing RRC connection...
> > Random Access Transmission: seq=62, ra-rnti=0x2
> > Random Access Transmission: seq=47, ra-rnti=0x2
> > Random Access Transmission: seq=1, ra-rnti=0x2
> > Random Access Transmission: seq=11, ra-rnti=0x2
> > Random Access Transmission: seq=18, ra-rnti=0x2
> > Random Access Transmission: seq=4, ra-rnti=0x2
> > Random Access Transmission: seq=29, ra-rnti=0x2
> > Random Access Transmission: seq=32, ra-rnti=0x2
> > Random Access Transmission: seq=1, ra-rnti=0x2
> > Random Access Transmission: seq=62, ra-rnti=0x2
> > Warning: Detected Radio-Link Failure
> > RRC Connection Reestablishment
> > Random Access Transmission: seq=58, ra-rnti=0x2
> > Random Access Transmission: seq=1, ra-rnti=0x2
> > Random Access Transmission: seq=18, ra-rnti=0x2
> > Random Access Transmission: seq=46, ra-rnti=0x2
> > RRC IDLE
> > [SoapyAdrv][setSampleRate] RX SamplingRate set to  1920000
> > [SoapyAdrv][setSampleRate] TX SamplingRate set to  1920000
> > Setting manual TX/RX offset to 0 samples
> > Found Cell:  Mode=FDD, PCI=1, PRB=6, Ports=1, CFO=0.7 KHz
> > [SoapyAdrv][setSampleRate] RX SamplingRate set to  1920000
> > [SoapyAdrv][setSampleRate] TX SamplingRate set to  1920000
> > Setting manual TX/RX offset to 0 samples
> > Random Access Transmission: seq=42, ra-rnti=0x2
> > Random Access Complete.     c-rnti=0x4e, ta=1036
> > RRC Connected
> > Warning: Detected Radio-Link Failure
> > [SoapyAdrv][setSampleRate] RX SamplingRate set to  1920000
> > [SoapyAdrv][setSampleRate] TX SamplingRate set to  1920000
> > Setting manual TX/RX offset to 0 samples
> > .
> > Found Cell:  Mode=FDD, PCI=1, PRB=6, Ports=1, CFO=0.7 KHz
> > [SoapyAdrv][setSampleRate] RX SamplingRate set to  1920000
> > [SoapyAdrv][setSampleRate] TX SamplingRate set to  1920000
> > Setting manual TX/RX offset to 0 samples
> > RRC Connection Reestablishment
> > Random Access Transmission: seq=49, ra-rnti=0x2
> > RRC IDLE
> > Random Access Transmission: seq=0, ra-rnti=0x2
> > Random Access Complete.     c-rnti=0x51, ta=1047
> > RRC Connected
> > Scheduling request failed: releasing RRC connection...
> > Random Access Transmission: seq=42, ra-rnti=0x2
> > Random Access Transmission: seq=39, ra-rnti=0x2
> > Random Access Transmission: seq=11, ra-rnti=0x2
> > Random Access Complete.     c-rnti=0x51, ta=936
> >
> > I would appreciate if anyone can help.
> > --
> > Samie
> >
> > _______________________________________________
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> > srslte-users at lists.softwareradiosystems.com
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> >
>
>

-- 
Samie
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