[srsran-users] PDU Session Establishment and user plane traffic issue

[Andre Puschmann]

Hi Iman,

the logs indeed look good until the last Reconfiguration that includes 
the PDU Session establishment accept. Also the UE acks the DL 
transmission, see:

2022-10-04T21:51:42.592030 [PHY1-NR] [I] [ 3545] PUCCH: f=1 prb=51:1 
symb=0:14 cs=0 occ=0 rnti=0x4601 ack=1 epre=+43.1 snr=+23.6 cfo=+9.5 
delay=+0.1 valid=y

Yet after half a second it sends a Setup Request again. I guess the 
setup is rather stationary, but it's a "long" time, are you sure the 
phone doesn't lose sync in between?

The Reconfig message looks good but the phone doesn't like something 
about it. Would be good to compare the message flow against a working 
setup. We haven't tested the particular phones you use.

Cheers
Andre



On 5/10/22 0:18, Iman Mohammadi wrote:
> Hi All,
> 
> I'm testing 5G SA by srsRAN using USRP B200 and Open5GS core, I faced an 
> issue at "PDU session establishment" procedure with srsRAN,
> 
> Issue description: after "PDU Session accpet" sends to UE, UE doesn't 
> send "PDU Session Establishment complete" and instead it sends new "RRC 
> Request" and "Service request" (seems, UE assumes RRC is released and 
> went to IDLE mode while isn't like this) and therefore no user plane 
> traffic, this happens over and over again,
> 
> This scenario tested with Samsung S21 FE and Huawei Mate 40 and result 
> is same,
> 
> It's appreciated to share your suggestions.
> 
> - UE signaling, enb.log, configuration and PCAP file is attached.
> 
> 
> * it's worth to say, these phones and core haven't any issue with OAI.
> 
> 
> Best Regards
> Iman Mohammadi
> 
> _______________________________________________
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> srsran-users at lists.srsran.com
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-- 
Andre Puschmann

Software Radio Systems (SRS)
https://www.srs.io
andre at srs.io

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