SCG Status Signaling for Dual-Connectivity Node Synchronization

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Solution Overview

Problem

In dual-connectivity systems, there is no technical solution for the master and secondary nodes to consistently understand the status of the secondary cell group (SCG) when it changes, leading to inconsistent understandings and unnecessary signaling.

Innovation Solution

Methods and apparatuses for transmitting and receiving SCG status information, including first and second status information to indicate suspension or resumption, ensuring synchronized understanding between master and secondary nodes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the terminal suspends the SCG connection to perform other tasks, then the terminal can perform other tasks, but the master node and secondary node have inconsistent understandings of the SCG status

Engineering Contradiction:

Improveterminal task flexibilityVSAvoidSCG status information consistency

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The secondary node sends SCG status information (including first status information indicating suspension and second status information indicating resumption) to the master node through signaling messages. This feedback mechanism ensures that both nodes maintain consistent understanding of the SCG status, resolving the information inconsistency problem while allowing the terminal to suspend SCG for other tasks.

Inventive Principle:

Principle #23Feedback

2Device complexity

If there is no SCG status notification mechanism, then the signaling overhead is reduced, but the master node and secondary node cannot synchronize their understanding of SCG status

Engineering Contradiction:

Improvesignaling overheadVSAvoidSCG status synchronization

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent defines preliminary status indication actions where the secondary node proactively notifies the master node of SCG suspension and resumption states before they affect network operations. This preliminary notification ensures both nodes are synchronized on SCG status, preventing inconsistent understandings while maintaining efficient signaling.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If the terminal camps on two networks simultaneously in MR-DC mode, then the terminal can access both networks, but the SCG status becomes difficult to manage and synchronize

Engineering Contradiction:

Improvenetwork access capabilityVSAvoidSCG status management

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The master node acts as an intermediary that receives SCG status information from the secondary node and maintains the authoritative record of SCG status. This intermediary role simplifies status management in MR-DC by centralizing status tracking and ensuring both nodes have consistent understanding without adding complex management overhead.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12556903B2Method and apparatus for notifying secondary cell group status information and network-side device

Publication Date: 2026.02.17 VIVO MOBILE COMM CO LTD

AI summary

A method and an apparatus for notifying SCG status information and a network-side device, and pertains to the field of wireless communication are provided. The method for notifying SCG status information is applied to a secondary node. The method includes: transmitting SCG status information to a master node based on an SCG status, where the SCG status information includes first status information or second status information, the first status information is used to indicate that the SCG is to be suspended, and the second status information is used to indicate that the SCG is to be resumed.