5GMM Procedure Handling for CAG Validity Changes
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Solution Overview
Problem
Current 5G New Radio (NR) technologies face challenges in efficiently handling changes in closed access group (CAG) validity between 'met' and 'not met' scenarios, which affects user equipment (UE) access and service continuity, particularly in localized service environments.
Innovation Solution
The proposed solution involves a method where user equipment (UE) maintains an enhanced CAG information list, including authorized CAG IDs for the current public land mobile network (PLMN), and performs specific actions such as aborting ongoing procedures and releasing NAS signaling connections when a CAG ID becomes unauthorized, allowing seamless transition to alternative authorized CAG cells or non-CAG cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE maintains an enhanced CAG information list and monitors CAG ID validity, then service continuity and access reliability are improved, but device complexity and processing overhead increase
Solution Approach 1:
The UE performs preliminary actions by maintaining an enhanced CAG information list with authorized CAG IDs and proactively monitoring validity changes before access issues occur. The UE aborts ongoing procedures and releases NAS signaling connections in advance when CAG validity changes, preventing service disruption rather than reacting to problems after they occur.
Solution Approach 2:
The UE autonomously manages CAG validity monitoring and self-adjustment without requiring continuous network intervention. The device independently maintains the CAG information list, detects validity changes, and executes appropriate actions (aborting procedures, releasing connections) autonomously to maintain service continuity.
2Reliability
If the UE aborts ongoing procedures and releases NAS signaling connections when CAG ID becomes unauthorized, then service disruption is reduced, but loss of time and connection resources increase
Solution Approach 1:
The UE applies preliminary anti-action by aborting ongoing procedures and releasing NAS signaling connections before they can complete unsuccessfully. When CAG validity changes, the UE proactively terminates existing procedures rather than allowing them to fail, preventing time loss and resource waste that would occur from completing invalid procedures.
Solution Approach 2:
The UE skips the normal procedure completion process when CAG validity changes occur. Instead of allowing procedures to run their full course and potentially fail, the UE abruptly terminates them through abort actions, rushing through the cleanup process to minimize time loss and restore access quickly.
3Adaptability or versatility
If the UE dynamically adapts to CAG validity changes and transitions to alternative cells, then adaptability and service continuity are improved, but device complexity and control overhead increase
Solution Approach 1:
The UE implements dynamic adaptation by continuously monitoring CAG validity and adjusting its behavior in real-time based on validity changes. The device dynamically transitions between authorized and unauthorized states, aborts procedures when necessary, and reconnects to alternative cells or CAG cells, maintaining flexibility and adaptability throughout the process.
Solution Approach 2:
The UE prepares for potential CAG validity changes by maintaining an enhanced CAG information list with multiple authorized CAG IDs. When validity changes occur, the UE has pre-configured information ready to quickly transition to alternative cells, reducing the complexity of real-time decision-making during actual transitions.
Data Source
AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The method may be performed by a UE. In certain configurations, the UE maintains a closed access group (CAG) information list including an entry. The UE supports enhanced CAG information. The entry includes an allowed CAG list associated with a current public land mobile network (PLMN). The allowed CAG list includes one or more CAG IDs. The UE accesses the current PLMN via a current CAG cell with a CAG ID. The CAG ID is determined as being authorized based on the allowed CAG list associated with the current PLMN. In response to a first event, the UE performs one or more of actions, including: aborting an ongoing UE-initiated 5GMM procedure if the ongoing UE-initiated 5GMM procedure exists, and locally releasing a non-access stratum (NAS) signaling connection if the NAS signaling connection exists.