Conditional Handover and CPAC Conflict Resolution in User Equipment

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wireless communication systems face conflicts and resource wastage due to concurrent or sequential triggering of conditional handover (CHO) and conditional primary secondary cell addition/change (CPAC) procedures in user equipment (UE), leading to errors and inefficient network resource management.

Innovation Solution

The implementation of methods and apparatuses within user equipment (UE) and wireless nodes to initiate and manage CHO and CPAC procedures, including determining execution conditions, applying configurations, and transmitting reconfiguration messages to avoid conflicts and optimize resource usage, such as discarding conflicting configurations and triggering handover cancellations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If both CHO and CPAC procedures are configured in UE, then handover and cell addition/change options are provided, but conflicts and errors occur due to concurrent or sequential triggering

Engineering Contradiction:

Improvehandover and cell addition/change optionsVSAvoidprocedure execution reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies preliminary action by establishing a clear execution priority between CHO and CPAC procedures before conflicts occur. The system pre-determines that CHO has higher priority than CPAC, and configures the UE to evaluate and execute CHO conditions first. This preliminary ordering prevents conflicts during concurrent triggering and ensures reliable procedure execution by eliminating ambiguity about which procedure should execute when both are configured.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If CHO procedure is executed, then handover to target cell is performed, but CPAC procedure may be incorrectly triggered or executed causing resource wastage

Engineering Contradiction:

Improvehandover execution efficiencyVSAvoidnetwork resource wastage

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent implements feedback mechanisms where the UE continuously monitors whether a CHO procedure has been executed or is currently executing. Before triggering a CPAC procedure, the UE checks the execution status of CHO and suppresses CPAC triggering if CHO is active or has recently executed. This feedback loop prevents redundant or conflicting procedure executions, ensuring productivity while avoiding network resource wastage from incorrect or duplicate operations.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If CPAC procedure is executed, then primary secondary cell is added or changed, but CHO configuration may be violated or conflicted

Engineering Contradiction:

Improvecell addition/change capabilityVSAvoidCHO configuration stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent applies preliminary anti-action by implementing protective logic that prevents CPAC execution when it would conflict with ongoing or recently executed CHO procedures. The system evaluates potential CPAC triggering conditions and suppresses them if CHO is active, thereby preventing configuration violations and maintaining CHO stability. This anti-action mechanism preserves the integrity of the higher-priority CHO configuration while still allowing CPAC to execute when appropriate.

Inventive Principle:

Principle #9Preliminary anti-action

4Adaptability or versatility

If UE monitors both CHO and CPAC conditions, then comprehensive handover options are available, but processing complexity and overhead increase

Engineering Contradiction:

Improvehandover decision flexibilityVSAvoidprocedure management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the handover decision logic into distinct, prioritized stages. Instead of treating CHO and CPAC monitoring as equal complex tasks, the system segments the evaluation process to first assess CHO conditions (highest priority), then assess CPAC conditions only if CHO does not apply. This segmentation simplifies the overall complexity by creating a hierarchical decision structure rather than requiring simultaneous complex monitoring of both procedures with equal weight.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12262254B2Handling of conditional handover and conditional primary secondary cell change

Publication Date: 2025.03.25 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may initiate one of a conditional handover (CHO) procedure or a conditional primary secondary cell addition/change (CPAC) procedure. The UE may perform a response action with regard to a configuration of the other of the CHO procedure or the CPAC procedure based at least in part on initiating the one of the CHO procedure or the CPAC procedure. Numerous other aspects are described.