UE Conditional Handover Re-establishment in MR-DC

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Solution Overview

Problem

In wireless communication networks, user equipment (UE) operating in multi-radio dual connectivity (MR-DC) mode faces issues during re-establishment procedures, particularly when detecting failures, as it often deletes MR-DC before cell selection, leading to state/configuration mismatches with the target candidate cell.

Innovation Solution

The UE is configured to delay the release of MR-DC during re-establishment initiation, allowing it to determine the selected cell and apply stored target configurations if available, or release MR-DC if no suitable configuration is found, thereby avoiding configuration mismatches.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE releases MR-DC before cell selection during re-establishment procedure, then the re-establishment procedure can be initiated, but a state/configuration mismatch occurs between the UE and the target candidate cell

Engineering Contradiction:

Improvere-establishment procedure reliabilityVSAvoidconfiguration consistency

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The UE performs cell selection and determines the target candidate cell before releasing MR-DC configuration. This preliminary action ensures that the UE knows which cell it will connect to before clearing the dual connectivity state, allowing it to apply stored target configurations correctly and avoid state/configuration mismatches.

Inventive Principle:

Principle #10Preliminary action

2Stability of the object's composition

If the UE delays the release of MR-DC during re-establishment initiation, then configuration consistency is maintained, but the re-establishment procedure duration increases

Engineering Contradiction:

Improveconfiguration consistencyVSAvoidre-establishment procedure time

Core Design Contradiction:

Stability of the object's compositionVSLoss of time

Solution Approach 1:

The UE performs cell selection and configuration application in advance before releasing MR-DC, rather than doing it sequentially after release. This reordering of operations as a preliminary action reduces the overall procedure time while maintaining configuration consistency.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20230189095A1Re-establishment of communication devices configured with conditional handover and operating in multi-radio dual connectivity

Publication Date: 2023.06.15 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method by a user equipment, UE, capable of operating in a multi-radio dual connectivity, MR-DC, mode in a network. The method can include initiating a re-establishment procedure, delaying a release of MR-DC responsive to the UE being configured with a conditional handover, CHO, and selecting a cell.