MA PDU Session Activation via ATSSS Container IE
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Solution Overview
Problem
In 5G networks, User Equipment (UE) needs to wait for explicit indications of user plane resource establishment on both 3GPP and non-3GPP access networks before considering a Multi-Access (MA) PDU session successfully established or converted, which delays data transmission.
Innovation Solution
The UE can consider an MA PDU session activated or converted and user plane resources successfully established upon receiving a PDU SESSION ESTABLISHMENT ACCEPT message or a PDU SESSION MODIFICATION COMMAND message with an ATSSS container IE, allowing immediate data transmission without waiting for explicit lower-layer indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for explicit indications of user plane resource establishment on both 3GPP and non-3GPP access networks before considering the MA PDU session successfully established, then the reliability of the PDU session establishment is improved, but the time required for session establishment increases
Solution Approach 1:
The network performs user plane resource establishment in advance on both 3GPP and non-3GPP access networks before the PDU session establishment procedure completes. The SMF establishes user plane resources proactively and provides early indication to the UE through the PDU SESSION ESTABLISHMENT ACCEPT message, eliminating the need for the UE to wait for separate resource establishment confirmations.
Solution Approach 2:
The SMF provides explicit feedback to the UE about user plane resource establishment status through information elements in the PDU SESSION ESTABLISHMENT ACCEPT message. This feedback mechanism allows the UE to immediately know whether user plane resources are established on 3GPP access, non-3GPP access, or both, without requiring additional waiting or indication messages.
2Reliability
If the UE waits for explicit lower-layer indications of user plane resource establishment before starting data transmission, then the transmission reliability is improved, but the data transmission latency increases
Solution Approach 1:
User plane resources are established in advance on both access networks before the PDU session establishment procedure completes. The SMF proactively configures the user plane and provides early indication to the UE, enabling the UE to start data transmission immediately after receiving the PDU SESSION ESTABLISHMENT ACCEPT message without waiting for additional resource establishment confirmations.
3Measurement precision
If the UE requires explicit indications from lower layers that user plane resources are established on both accesses, then the accuracy of resource establishment confirmation is improved, but the complexity of the establishment procedure increases
Solution Approach 1:
The indication of user plane resource establishment status is merged into the existing PDU SESSION ESTABLISHMENT ACCEPT message through information elements. This combines multiple functions (session establishment confirmation and resource status indication) into a single message exchange, reducing procedural complexity while maintaining precise confirmation of resource establishment status on both access networks.
Data Source
AI summary
A method to establish and activate an MA PDU session for data transmission over a selected access is proposed. UE initiates a UE-requested PDU session establishment procedure. Once the UE receives a PDU SESSION ESTABLISHMENT ACCEPT message with ATSSS container IE, the UE can consider the MA PDU session has been activated and user plane resources are successfully established on the selected access. A method to convert an SA PDU session to an MA PDU session for data transmission over a selected access is proposed. UE initiates a UE-requested PDU session modification procedure. Once the UE receives a PDU SESSION MODIFICATION COMMAND message with ATSSS container IE, the UE can consider the MA PDU session has been converted from the SA PDU session and user plane resources are successfully established on the selected access.