Conditional SN Addition Timing Adjustment for Fast MCG Recovery

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Interactions between the conditional SN addition procedure and the fast MCG recovery procedure in wireless communication systems can cause these procedures to fail, leading to loss of dual connectivity and network connectivity for user equipment (UE).

Innovation Solution

The UE operating in dual connectivity with a master node (MN) and a secondary node (SN) adjusts the timing or execution of the conditional SN addition procedure in view of the fast MCG recovery procedure. The MN determines which procedure to prioritize and notifies the secondary node accordingly, allowing the SN to process release indications during recovery operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the conditional SN addition procedure and fast MCG recovery procedure are executed simultaneously, then the system attempts to handle multiple scenarios, but the procedures interfere with each other causing failure

Engineering Contradiction:

Improveability to handle multiple scenariosVSAvoidprocedure success rate

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies preliminary action by having the UE suspend the conditional SN addition procedure before executing the fast MCG recovery procedure. By proactively pausing the conditional procedure when MCG failure is detected, the system prevents procedural interference while maintaining the ability to resume the conditional procedure after recovery, thus ensuring reliability without sacrificing adaptability

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the UE waits for recovery procedure completion before executing conditional SN addition, then procedural interference is avoided, but latency increases

Engineering Contradiction:

Improveprocedure execution reliabilityVSAvoidprocedure execution latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies dynamics by making the conditional SN addition procedure suspendable and resumable rather than completely blocked. The procedure dynamically adjusts its execution state based on the recovery procedure's progress, suspending when needed to avoid interference and resuming when safe to execute, thus balancing reliability with reduced latency

Inventive Principle:

Principle #15Dynamics

3Reliability

If the UE releases C-PSCell configuration upon MCG failure, then resources are freed for recovery, but connectivity to C-SN is lost

Engineering Contradiction:

Improverecovery procedure reliabilityVSAvoidconnectivity maintenance

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent applies preliminary action by having the UE suspend rather than release the C-PSCell configuration when MCG failure occurs. This preliminary suspension preserves the configuration and connectivity to the candidate SN while still allowing the fast MCG recovery procedure to execute reliably, and the configuration can be released afterward if recovery succeeds

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12284710B2Fast failure recovery with master node

Publication Date: 2025.04.22 GOOGLE LLC

AI summary

A UE communicating in DC with an MN and an SN receives a configuration related to a C-SN and at least one condition for connecting to the C-SN, determines that a radio connection between the UE and the MN has failed, and transmits a first indication of the failed radio connection to the SN to initiate a recovery procedure. The UE also releases the configuration and/or the at least one condition, or suspending a procedure, for connecting to the C-SN\.