[srslte-users] Connection Reestablishment

[Samie Mostafavi]

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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