Conditional Handover With Parallel PSCell Change/Additions

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Solution Overview

Problem

Existing wireless communication networks face challenges in efficiently managing simultaneous execution of Conditional Handover (CHO) and Conditional PSCell Change/ Addition (CPC/CPA) operations due to ambiguities in configuration and execution order, leading to potential signaling overhead and inefficiencies.

Innovation Solution

The proposed solution involves the UE receiving CPC or CPA configurations indicated for parallel evaluation with CHO, with execution conditions and target PSCell identities provided outside the CHO configuration, allowing the UE to determine the order of execution based on network-provided criteria or current serving cell conditions, and enabling combined or parallel execution of these operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If CHO and CPC/CPA configurations are provided separately with independent execution conditions, then the network can independently optimize each operation, but signaling overhead increases and execution ambiguities arise

Engineering Contradiction:

Improvemobility management reliabilityVSAvoidconfiguration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines CHO and CPC/CPA configurations into a single unified configuration message from the source gNB. The target configuration includes both the target PCell identity for CHO and the target PSCell identity for CPC/CPA, along with a single execution condition. This merging eliminates the need for separate configurations and reduces signaling overhead while ensuring consistent execution of both operations.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The unified configuration message serves multiple functions simultaneously: it provides CHO configuration for PCell change, CPC configuration for PSCell change, and CPA configuration for PSCell addition. The single execution condition governs all three operations, making the configuration universal and eliminating ambiguities about which operation to prioritize.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If execution conditions for CHO and CPC/CPA are set independently by different base stations, then each base station can optimize for its own operation, but execution order ambiguities arise when both conditions are met simultaneously

Engineering Contradiction:

Improvehandover execution efficiencyVSAvoidexecution order determination

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The patent segments the configuration into clear components: the source gNB provides the unified configuration containing target PCell identity, target PSCell identity, and execution condition. The UE evaluates this single execution condition against measured signal qualities. When met, the UE executes both CHO and CPC/CPA operations in a defined sequence, eliminating ambiguity about execution order.

Inventive Principle:

Principle #1Segmentation

3Use of energy by moving object

If the UE decodes the target configuration only when execution conditions are fulfilled, then power consumption is reduced, but configuration ambiguities cannot be resolved in advance

Engineering Contradiction:

ImproveUE power consumptionVSAvoidconfiguration clarity

Core Design Contradiction:

Use of energy by moving objectVSLoss of information

Solution Approach 1:

The source gNB performs preliminary action by providing the complete target configuration in advance within the unified CHO configuration message. This includes the target PCell identity, target PSCell identity, and the execution condition. The UE can evaluate this pre-provided configuration against its measurements without needing to decode additional messages, resolving all ambiguities before execution while maintaining power efficiency.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250310854A1Conditional Handover Including Conditional PSCell Change/Addition with Simultaneous Evaluation

Publication Date: 2025.10.02 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Methods and apparatuses resolve potential ambiguity when a UE is configured with multiple conditional operations. The UE may decode a Conditional Handover (CHO configuration at reception, and extract Conditional PSCell Change (CPC) and/or Conditional PSCell Addition (CPA) configurations, along with execution conditions, measurement configuration, and candidate PSCell identity bundled therein. Alternatively, the latter may be provided outside the CHO configuration, such as in RRC commands. Aspects include methods for the UE to determine the order of execution of different conditional configurations for which the execution conditions are fulfilled at the same time. In one aspect, the UE performs execution of CHO and CPA/CPC in a combined or a non-sequential (parallel) fashion. Aspects include methods for indicating that a conditional configuration is included within another conditional configuration between different network nodes, where the evaluation of the different conditional configurations are to be performed in parallel by the UE. Publication