MA PDU Session Management for LADN in 5G ATSSS
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Solution Overview
Problem
In 5G mobile communication systems, Local Area Data Network (LADN) services can only be provided through 3GPP access, limiting the application of Access Traffic Steering, Switching, and Splitting (ATSSS) functions which distribute data traffic between a data network and a User Equipment (UE) using both 3GPP and non-3GPP access.
Innovation Solution
A method and device that enable the establishment of a multi-access protocol data unit (MA PDU) session in a mobile communication system, allowing data traffic transmission through non-3GPP access by considering location information, registration status, and subscriber information of the UE, and determining the appropriate access type for ATSSS functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LADN services are provided only through 3GPP access, then service reliability is ensured through controlled access, but access versatility is limited and ATSSS functions cannot be applied
Solution Approach 1:
The patent enables LADN services to be accessed through both 3GPP and non-3GPP access types by establishing MA PDU sessions. The session management function and access and mobility management function work together to allow a single LADN service to be reachable via multiple access types, making the system universal and enabling ATSSS functions to distribute traffic across different access networks.
2Adaptability or versatility
If MA PDU session establishment is allowed for LADN DNN, then access versatility is improved by enabling non-3GPP access, but session management complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism where the access and mobility management function acts as a mediator between the session management function and the access networks. This intermediary handles the complexity of MA PDU session establishment by managing the interaction between different access types and the core network, thereby reducing the burden on individual components and making the system more manageable.
3Productivity
If ATSSS functions are applied to LADN DNN, then productivity is improved through traffic distribution, but device complexity increases due to multi-access management
Solution Approach 1:
The patent implements dynamic traffic distribution between 3GPP and non-3GPP accesses based on current network conditions, UE capabilities, and service requirements. The ATSSS functions dynamically steer, switch, and split traffic across different access networks, allowing the system to adapt to changing conditions and optimize data transmission efficiency while managing complexity through automated dynamic control.
Data Source
AI summary
The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method according to an embodiment of the present invention is a method for managing a multi-access protocol data unit (MA-PDU) session of a user equipment (UE) by an access and mobility management function (AMF) device of a mobile communication system, and the method may comprise the steps of: receiving, from the UE, a PDU session establishment request message including access traffic steering, switching, and splitting (ATSSS) capability information supported by the UE; identifying whether the PDU session establishment request message is an MA-PDU request for a local area data network (LADN); and transmitting, to the UE on the basis of the identification, a rejection message for rejecting of the MA PDU request for the LADN.