5GS UE Congestion Control Across PLMN–NPN Transitions
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Solution Overview
Problem
The existing 5G System (5GS) lacks clear mechanisms for congestion control when a User Equipment (UE) transitions between Public Land Mobile Networks (PLMNs) and Non-Public Networks (NPNs, particularly regarding the continuation of congestion control during such transitions.
Innovation Solution
A UE equipped with a controller and transmission and reception unit that initiates a timer for congestion control based on Data Network Name (DNN) and back-off timer values, specifically for Stand-alone Non-Public Networks (SNPNs), ensuring per-DNN and per-SNPN management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If congestion control timer is started per DNN and SNPN, then congestion control management is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the congestion control timer management into separate, independent timers for each DNN and SNPN combination. Instead of using a single unified timer mechanism, the system creates distinct timer instances (e.g., T3396, T3584, T3585) that operate independently for different data networks and network types, allowing granular control while maintaining manageable complexity through modular organization.
2Manufacturing precision
If timer is started per DNN and SNPN, then resource management precision is improved, but information management complexity increases
Solution Approach 1:
The patent implements local quality by assigning specific timer characteristics and parameters tailored to each DNN and SNPN combination. Each timer instance has customized properties such as timer values, start conditions, and expiration behaviors that are optimized for the specific network context, ensuring precise resource management while maintaining clear information tracking through context-specific configurations.
Data Source
AI summary
According to an aspect of the present invention, a mobile terminal apparatus and an intra-core network apparatus do not enable congestion control during connection of a mobile terminal apparatus to a non-public network (NPN) in 5GS. Alternatively, during connection of the mobile terminal apparatus to the NPN in 5GS, the mobile terminal apparatus and the intra-core network apparatus enable congestion control only in a public land mobile network (PLMN) specific to the congestion control to provide a congestion control method in an NAS level to the mobile terminal apparatus being connected to the non-public network (NPN) and the intra-core network apparatus in 5GS.