Reason for UE context release after PDU session establishment accept is successfully done

Specs & Protocol Testing
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1

Hi Experts.

What could be the reason for UE context release after PDU session establishment accept is done successfully?

5G SA cell.

2

Is cause provided in context release message?

3

It’s mentioned unspecified.

4

Then you need to see from the other side.

Higher entity may record a better reason.

5

Request rejected, unspecified: If the received request type is “initial emergency request” and there is already another emergency PDU session for the UE, the SMF shall reject the PDU SESSION ESTABLISHMENT REQUEST message with 5GSM cause #31 “request rejected, unspecified” or release locally the existing emergency PDU session and proceed the new PDU SESSION ESTABLISHMENT REQUEST message.

6

I see that CU sends UEcontextmodification to DU but DU not responding to this message.

This means there is no uEcontextModificationResponse by du to cu although CU sends UEcontrxtModificationRequest to DU.

Then I changed dedicated ss from two dedicated ss to one SS… DU responding!

How it comes?