5G UE Location Update for Non-3GPP TAI Changes
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Solution Overview
Problem
Existing wireless communication systems face challenges in updating the location of user equipment (UE) when multiple tracking area identifications (TAIs) are allocated based on non-3GPP access methods, particularly when a TAI change occurs, leading to issues in service request rejections and inadequate location updates.
Innovation Solution
A method and apparatus for updating the UE location by providing location update information through service accept or configuration update command messages, and including rejection information in service reject messages, with a re-registration procedure based on non-3GPP access in wireless communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple TAIs are allocated to UE based on non-3GPP access method, then coverage and service availability are improved, but location update accuracy deteriorates when TAI changes
Solution Approach 1:
The patent segments the location update process by introducing distinct procedures for TAI change detection and handling. The AMF device separates the service request rejection mechanism from the location update mechanism, allowing independent optimization of each function while maintaining overall system accuracy.
Solution Approach 2:
The patent implements feedback loops where the AMF device monitors TAI changes and sends location update notifications to the UE. The system continuously tracks TAI validity and provides feedback messages to maintain accurate location information, ensuring that location updates occur promptly when TAI changes are detected.
2Ease of operation
If location update procedures are simplified for non-3GPP access, then ease of operation is improved, but reliability of location updates deteriorates
Solution Approach 1:
The patent applies preliminary action by having the AMF device pre-allocate multiple TAIs to the UE before TAI changes occur. This allows the system to prepare location update information in advance, so when a TAI change happens, the update can be executed reliably without complex real-time processing.
Solution Approach 2:
The AMF device acts as an intermediary that manages the complexity of location updates between the core network and the UE. It processes TAI change detections, generates appropriate notifications, and coordinates the timing of location updates, thereby shielding the UE from complex procedures while ensuring reliable updates.
3Loss of information
If service request rejection messages are enhanced with TAI change information, then information completeness is improved, but device complexity increases
Solution Approach 1:
The patent merges TAI change information with existing service request rejection messages. Instead of creating separate complex message structures, the TAI change indication is integrated into the rejection message framework, allowing information completeness to improve while keeping the message processing logic relatively simple and unified.
Data Source
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AI summary
A method of updating a location of a user equipment (UE) in a wireless communication system may comprise the UE being registered in a 5G system (5GS) through non-3GPP access, the UE transitioning to an idle state for the non-3GPP access, and the UE performing a service request procedure to transition from the idle state to a connected state for the non-3GPP access. When the UE is registered in the 5GS through the non-3GPP access, a tracking area identification (TAI) for a registration area (RA) of context of the UE may be set to a first TAI, and the service request procedure may be performed based on a second TAI.