AMF-UE-NGAP-ID mismatch between the authentication request and response messages about srsran_project HOT 5 CLOSED

Thanks for reporting this bug @Shashank6669 . We'll look into it.

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Hey, we've just pushed an update to main that should include a fix for this. Please give it a try. Closing this issue - please reopen if it's still not working for you.

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Hey @andrepuschmann
I was trying to connect srsRAN to oaiCore and I've faced this issue. Attached you can find my logs + pcaps.
Briefly, the RAN and core will get connected, and my UE (a Quectel 5G modem) will get attached and authenticated to the testbed with no issues. However, as soon as the UE starts a PDU session, UE_CONTEXT_RELEASE is sent. Below you can see that the ID assigned to the UE by the RAN is not the same as the one assigned by the AMF.

RAN platform: srsRAN 5G gNB version 23.5.0

Logs.zip

Please let me know if you need more logs.
Thanks! :)

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Hey,
from what I can see is that the UE is somehow losing the connection and sends a RRCSetupRequest and a subsequent ServiceRequest again. I am not sure why this is the case because the gNB has not released RRC yet. You need to investigate the reason for that. Maybe a connection loss or so.

Anyway, what happens then is that the gNB sends an initial UE message to the core with the newly allocated RAN UE ID. The core sends a Release for that ID immediately. Why this is the case again I don't know. You have to check your core logs. But since there is no context for this ID yet (only the initial UE message has been sent) the gNB simply logs the incident and continues.

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Hi again,
sorry for the delay in answering here.
I'm still having the same issue. I've tried a different UE and also looked at the logs on the core side. To my understanding, the UE doesn't complete the RRC connection and I'm not sure why. There might be an issue with the core + RAN connection, but I don't see any errors and the NGAP connection is established successfully. Anyways, I'm still working on it, but thanks for the help. :)

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