Inter-SN Conditional PSCell Change With Preconfigured RRC Signaling

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Solution Overview

Problem

Existing technologies lack signaling and procedures to support inter-SN initiated Conditional PSCell Change (CPC) in Multi-Radio Dual Connectivity (MR-DC) scenarios, leading to issues such as uncertainty in target candidate SN selection, resource misallocation, and unclear condition setting for RRC Reconfiguration messages.

Innovation Solution

Proposes five alternative methods for configuring inter-SN SN-initiated Conditional PSCell Change, where the source SN, master node (MN), or target SN generates the final RRC Reconfiguration message based on input from other nodes, ensuring clear condition setting and resource management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If inter-SN initiated Conditional PSCell Change is implemented without standardized signaling, then mobility flexibility is improved, but signaling uncertainty and resource misallocation occur

Engineering Contradiction:

Improvemobility flexibilityVSAvoidsignaling reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The Master Node (MN) serves as an intermediary between Source SN and Target SN in inter-SN CPC scenarios. The MN receives CPC indication from Source SN, selects appropriate Target SN, and coordinates the conditional reconfiguration process, ensuring reliable signaling while maintaining mobility flexibility

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The Target SN prepares conditional reconfiguration resources and configuration messages in advance before the actual PSCell change occurs. This preliminary preparation ensures that when the execution condition is met, the UE can immediately apply the pre-configured parameters without delay or uncertainty

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If multiple nodes are involved in inter-SN CPC, then mobility management capability is improved, but device complexity and coordination overhead increase

Engineering Contradiction:

Improvemobility management capabilityVSAvoidcoordination complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The inter-SN CPC procedure is segmented into distinct functional stages: Source SN generates CPC indication, MN performs target selection and coordinates signaling, and Target SN prepares reconfiguration resources. This segmentation allows each node to perform its specific function without being burdened by the entire complex process

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The Master Node performs multiple functions including target SN selection, signaling coordination, and procedure management. This multi-functionality consolidates coordination complexity in a single universal node rather than requiring complex peer-to-peer coordination between multiple SNs

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Loss of time

If conditional reconfiguration is prepared early, then handover execution time is reduced, but resource allocation uncertainty increases

Engineering Contradiction:

Improvehandover execution timeVSAvoidresource allocation uncertainty

Core Design Contradiction:

Loss of timeVSQuantity of substance

Solution Approach 1:

The Target SN prepares conditional reconfiguration resources and generates RRC Reconfiguration messages with conditional execution parameters in advance. This preliminary action ensures that when the UE meets the execution condition, it can immediately apply the pre-configured parameters without additional signaling delay

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The Source SN provides feedback to the MN about the CPC execution condition status, and the MN coordinates with the Target SN to adjust resource allocation based on actual execution progress. This feedback mechanism allows dynamic resource management that reduces uncertainty while maintaining early preparation benefits

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250380203A1Sn-initiated conditional pscell change (CPC) with sn change

Publication Date: 2025.12.11 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method by a user equipment, UE, includes receiving an RRC reconfiguration message, RRCReconfiguration, from a master node, where the RRCReconfiguration message includes a secondary cell group, SCG, measurement configuration comprising a configuration of at least one measurement identifier referred in an execution condition for a conditional primary secondary cell, PSCell, change, CPC, where the SCG measurement configuration is included within another RRC reconfiguration message, RRCReconfiguration***, to be applied by the UE upon reception; and at least one conditional reconfiguration for CPC, the conditional reconfiguration comprising for a target candidate cell of a candidate target-secondary node: the SCG configuration; and the execution condition for CPC, where the UE is to apply the SCG configuration upon fulfillment of the execution condition for CPC. The UE applies the reconfiguration message and the SCG measurement configuration, within the RRCReconfiguration*** message. The UE stores an SCG configuration. The UE monitors the fulfillment of the execution conditions for the target candidate cell. The UE transmits, to the master node, a reconfiguration complete message, RRCReconfigurationComplete, indicating that the UE has received and applied the RRCReconfiguration message, where the RRCReconfigurationComplete message comprises an embedded second reconfiguration complete message, RRCReconfigurationComplete***, indicating that the UE has received and applied the RRCReconfiguration*** message.