PSCell Conditional Change Handling for Conflicting RRC Signaling

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Solution Overview

Problem

Existing solutions for PSCell change in dual-connectivity scenarios fail to address conflicts between UE and the MN's RRC signaling during PSCell conditional change, leading to instability in radio links.

Innovation Solution

A method for UE to terminate PSCell change upon receiving specific types of RRC signaling from the MN, such as RRC signaling for PCell change, PSCell change, or release signaling, ensuring correct handling of PSCell change and link management, thereby avoiding loss of control and improving radio link stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the UE continues to maintain connection with the MN during PSCell change, then the UE can receive RRC signaling from the MN, but conflicts between PSCell change process and RRC signaling may occur leading to radio link instability

Engineering Contradiction:
ImproveUE's ability to receive RRC signaling during PSCell changeVSAvoidradio link stability
Core Design Contradiction:
Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies preliminary anti-action by detecting the type of RRC signaling before it causes conflict with the PSCell change process. The UE identifies signaling that would terminate PSCell change (such as PCell change signaling, PSCell release signaling, or SCG failure signaling) and takes preventive action by terminating the PSCell change process in advance, thereby avoiding the harmful conflict and maintaining radio link stability.

Inventive Principle:
Principle #9Preliminary anti-action

2Reliability

If the UE terminates PSCell change upon receiving conflicting RRC signaling, then radio link stability is improved, but the UE must accurately identify conflicting signaling types

Engineering Contradiction:
Improveradio link stabilityVSAvoididentification of conflicting RRC signaling types
Core Design Contradiction:
ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent uses signaling type identification as an analog of 'color changes' - different RRC signaling types are categorized and identified by their specific characteristics and information elements. The UE detects conflicting signaling by examining the type and content of received RRC signaling, identifying patterns that indicate termination conditions (such as presence of PCell change information, PSCell release information, or SCG failure information), thereby accurately distinguishing conflicting signaling from non-conflicting signaling.

Inventive Principle:
Principle #32Color changes

Data Source

PatentUS12526699B2Cell conditional change method, user equipment and computer-readable storage medium
Publication Date: 2026.01.13 SPREADTRUM COMMUNICATION (SHANGHAI) CO LTD
  • US12526699B2 patent drawing
  • US12526699B2 patent drawing

AI summary

A cell conditional change method, a user equipment and a computer-readable storage medium are provided. The method includes: based on determining that a candidate PSCell meets a PSCell change trigger condition, transmitting an RRC signaling to an MN, wherein a candidate PSCell or a target PSCell that meets the PSCell change trigger condition is indicated in the RRC signaling.