PDU Session Management via RAN-AMF Handover Signaling
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Solution Overview
Problem
Current mobile communication systems face challenges in efficiently managing Protocol Data Unit (PDU) sessions during handover and release procedures, particularly in scenarios involving user equipment (UE) mobility and inactivity, leading to unnecessary signaling and context maintenance.
Innovation Solution
A method is proposed where the Radio Access Network (RAN) and Access and Mobility Management Function (AMF) collaborate to initiate and manage handover and release of activated PDU sessions by transmitting specific messages, including PDU session IDs, to minimize unnecessary signaling and context maintenance, ensuring efficient handover and release processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover is performed for all PDU sessions during UE mobility, then session continuity is maintained, but signaling overhead increases
Solution Approach 1:
The patent extracts and identifies only the activated PDU sessions (those with established data radio bearers and N3 interface tunnels) from the complete set of PDU sessions. During handover, signaling is performed only for these activated sessions rather than all sessions, thereby reducing signaling overhead while maintaining session continuity for active data flows.
2Productivity
If release procedure is performed for all PDU sessions due to UE inactivity, then resource utilization is optimized, but session restoration capability is reduced
Solution Approach 1:
The patent extracts and identifies activated PDU sessions based on the presence of established data radio bearers and N3 interface tunnels. During release procedures triggered by UE inactivity, only these activated sessions are released while inactive sessions are preserved. This selective approach optimizes resource utilization by releasing active resources while maintaining the ability to quickly restore sessions if the UE becomes active again.
3Loss of energy
If handover signaling is reduced to only activated PDU sessions, then signaling overhead is minimized, but session management complexity increases
Solution Approach 1:
The patent performs preliminary identification and marking of activated PDU sessions before handover or release procedures are initiated. By pre-establishing which sessions are activated (based on data radio bearer and N3 interface tunnel status) and which are inactive, the system simplifies the actual handover/signaling process. This preliminary classification reduces the complexity of real-time session management during dynamic operations.
Data Source
AI summary
It is disclosed a method for managing a PDU session in a wireless communication system and an apparatus for supporting the same. Particularly, a method for performing handover of a User Equipment (UE) performed by a source Radio Access Network (RAN) that includes a processor, a memory and a communication module in a wireless communication system may include determining to initiate handover to a target RAN; and transmitting a Handover Required message to a source Access and Mobility Management Function (AMF), and the handover is a handover in a case that there is no interface between the RANs or AMF change is required, and the Handover Required message includes a PDU session Identifier (ID) of an activated Protocol Data Unit (PDU) session.