UE and SMF Feedback for MA PDU Session Establishment
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Solution Overview
Problem
The details of apparatus behavior during PDU session establishment for Multi-Access (MA) PDU Sessions in the 5G System (5GS) are not clarified, particularly in response to permission or rejection of session establishment requests by the network side.
Innovation Solution
A User Equipment (UE) and Session Management Function (SMF) are designed to recognize and establish MA PDU sessions through controllers and transmission/reception units, with the UE determining ATSSS support and initiating or rejecting PDU session establishment procedures based on network support, and the SMF indicating session establishment via ATSSS container Information Elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a PDU session establishment procedure is performed to establish an MA PDU Session, then multi-access communication capability is enabled, but the behavior of each apparatus during the procedure is not clarified
Solution Approach 1:
The patent implements feedback mechanisms where the network side provides ATSSS container Information Elements in the PDU session establishment accept message to indicate MA PDU session establishment status and user plane resources. The UE also provides feedback by determining ATSSS support from network information and initiating or rejecting PDU session establishment procedures accordingly. This bidirectional feedback clarifies the behavior of each apparatus during the procedure.
2Productivity
If the UE initiates PDU session establishment procedure without clear procedure definition, then session establishment may occur, but incorrect or inconsistent behavior may result
Solution Approach 1:
The patent applies preliminary action by having the UE determine ATSSS support from network information before initiating the PDU session establishment procedure. The network side also prepares ATSSS container Information Elements in advance to include in the acceptance message. This preliminary preparation ensures that both apparatuses are properly configured and understand the procedure requirements before execution, preventing incorrect or inconsistent behavior.
Data Source
AI summary
According to one aspect of the present invention, a communication unit for realizing a function for ATSSS in a 5GS is provided. A UE transmits a PDU session establishment request message including an MA PDU Request indication and ATSSS Capability, and in a case that an MA PDU session is allowed to be established and that only the user plane resources for one of 3GPP access or non-3GPP access are allowed to be established, the UE receives information indicating that the MA PDU session is allowed to be established, an access type corresponding to the user plane resources allowed to be established, a value indicating a cause of disallowance of establishment of the user plane resource for an access type different from the above-described access type, and a PDU session establishment accept message including ATSSS rules, and establishes the MA PDU session.