Conditional PSCell Change Signaling for 5G Secondary Nodes

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Solution Overview

Problem

In 5G communication environments, existing technologies face challenges in efficiently managing conditional cell changes due to changing radio or load conditions, particularly in scenarios where the source node is unaware of the target PSCells prepared by the target SN, leading to inefficiencies in configuring conditional reconfigurations.

Innovation Solution

The source SN communicates a single measurement ID, a list of prepared target PSCells, or a combination of measurement IDs and default IDs to the master node, which generates a conditional reconfiguration message for the UE, ensuring accurate execution conditions for target PSCell changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the source SN initiates a conditional cell change operation, then the handover process can be started, but the source SN is unaware of the target PSCells prepared by the target SN leading to configuration inefficiencies

Engineering Contradiction:
Improvehandover success rateVSAvoidtarget PSCell information
Core Design Contradiction:
ReliabilityVSLoss of information

Solution Approach 1:

The master node acts as an intermediary between the source SN and target SN. The source SN sends measurement IDs to the master node, which then retrieves the corresponding target PSCell information from the target SN and generates the conditional reconfiguration message. This mediator approach resolves the information asymmetry problem where the source SN needs target PSCell information that it cannot directly obtain.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Adaptability or versatility

If multiple conditional cell changes are configured, then flexibility is improved, but the complexity of managing and updating configurations increases

Engineering Contradiction:
Improveconditional cell change flexibilityVSAvoidconfiguration management complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The system implements feedback mechanisms where the source SN can send updated measurement IDs to the master node if conditions change, allowing the conditional reconfiguration to be updated dynamically. The master node manages multiple measurement IDs and their corresponding target PSCells, enabling flexible updates without manual reconfiguration while maintaining system complexity at manageable levels.

Inventive Principle:
Principle #23Feedback

Data Source

PatentUS12550013B2Inter secondary node conditional PSCell change
Publication Date: 2026.02.10 NOKIA TECHNOLOGIES OY
  • US12550013B2 patent drawing
  • US12550013B2 patent drawing
  • US12550013B2 patent drawing

AI summary

This disclosure presents processes to allow a conditional reconfiguration of a conditional cell change operation between a user equipment (UE) and one or more of a master node (MN), a source secondary node (SN), or a target SN. In some aspects, a SN/SgNB change required message can include a measurement ID for target PSCells, a dedicated measurement ID for each target PSCell, a set of measurement IDs, or a list of target PSCells, where the data can be prepared by the target SN, or an indication for the MN to inform the source SN about a list of prepared target PSCells or a default measurement ID. In some aspects, the respective of a RRCReconfiguration or a RRCConnectionReconfiguration message can include the measurement ID, the set of measurement IDs, or the default measurement ID to inform the UE on the configurations for the cell change operation.