UE Unified Access Control for Priority-Based Service Barring
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Solution Overview
Problem
Existing 5G NR networks face issues with access barring rules prioritizing the lowest access category number, leading to important network services being inadvertently barred, resulting in poor user experience and reduced network flexibility.
Innovation Solution
Implement a rule in the UE processor to select the lowest access category that is not barred among multiple access attempts, and skip access checks during radio link failures for service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network prioritizes the lowest access category number for access barring, then access control flexibility is improved, but essential network services may be inadvertently barred
Solution Approach 1:
The patent segments the access control mechanism by introducing a priority field that divides access categories into different priority levels. This allows the system to separately identify and protect high-priority services (like MMTEL voice/video and IMS registration) from being barred, while still applying access control to lower-priority services. The segmentation resolves the contradiction by enabling flexible access control without compromising essential service availability.
Solution Approach 2:
The patent applies local quality by assigning different priority characteristics to different access categories based on their service importance. High-priority services receive protective treatment (exemption from barring when in conflict), while lower-priority services subject to normal access control. This localized differentiation resolves the contradiction by ensuring essential services maintain reliability while preserving overall access control flexibility.
2Measurement precision
If access checks are performed for all access attempts, then access control precision is improved, but service continuity during radio link failures deteriorates
Solution Approach 1:
The patent implements preliminary action by pre-defining priority levels for different access categories before access attempts occur. When a radio link failure happens, the UE can immediately identify high-priority services that need urgent recovery without performing time-consuming access checks. This preliminary classification resolves the contradiction by maintaining access control precision for normal operations while enabling rapid service recovery during failures.
Solution Approach 2:
The patent applies skipping by allowing the UE to bypass access checks for high-priority services during radio link failure scenarios. When service continuity is critical (indicated by RLF conditions), the UE can rush through the recovery process by skipping the access check step for prioritized services. This resolves the contradiction by maintaining precision when conditions are normal while improving productivity during emergency recovery situations.
Data Source
AI summary
A user equipment (UE) is configured to determine a first access attempt to access a first network service is associated with a first access category, wherein the first access category is associated with a first Unified Access Control (UAC) rule, wherein the first UAC rule has a first priority and determine a second access attempt to access a second network service is associated with a second access category, wherein the second access category is associated with a second UAC rule, wherein the second UAC rule has a second priority.