MCG Radio Link Failure Reporting via PUCCH During SCG Suspension

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently reporting master cell group (MCG) failures during secondary cell group (SCG) suspension, leading to increased latency and signaling overhead.

Innovation Solution

A method and apparatus for reporting MCG failure information via a physical uplink control channel (PUCCH) during SCG suspension, allowing for fast MCG link recovery without performing connection re-establishment procedures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If connection re-establishment procedure is performed when MCG link failure occurs during SCG suspension, then reliability is improved, but latency increases and signaling overhead increases

Engineering Contradiction:

Improvelink recovery reliabilityVSAvoidrecovery latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-configuring the UE with failure detection capabilities and failure information storage before the actual failure occurs. The UE is configured to detect failures on the MCG and store failure information, so when a failure actually occurs during SCG suspension, the UE can immediately transmit the pre-prepared failure information via PUCCH without needing to perform full connection re-establishment procedures, thereby reducing latency while maintaining reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses PUCCH as an intermediary channel to transmit MCG failure information during SCG suspension. Instead of requiring the full connection re-establishment procedure through traditional channels, the PUCCH serves as a direct intermediary pathway that allows the UE to notify the network of MCG failures efficiently, enabling fast recovery without the complete re-establishment overhead

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If connection re-establishment procedure is performed when MCG link failure occurs during SCG suspension, then reliability is improved, but signaling overhead increases

Engineering Contradiction:

Improvelink recovery reliabilityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the essential failure notification function from the complete connection re-establishment procedure. Instead of performing the entire re-establishment sequence which includes multiple signaling messages and procedures, the system extracts only the critical failure information transmission component and implements it separately via PUCCH, thereby reducing signaling overhead while maintaining the reliability of link recovery

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent segments the connection recovery process into two independent parts: (1) failure detection and information storage functionality that operates continuously, and (2) failure notification transmission via PUCCH that activates only when needed. This segmentation allows the system to avoid the overhead of full connection re-establishment procedures while maintaining reliable failure recovery

Inventive Principle:

Principle #1Segmentation

3Loss of time

If PUCCH is used for MCG failure reporting during SCG suspension, then latency is reduced, but device complexity increases

Engineering Contradiction:

Improvefailure reporting latencyVSAvoidfailure detection and reporting mechanism complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent applies multi-functionality by configuring the PUCCH channel to serve multiple purposes: it continues to transmit traditional uplink control information while simultaneously being utilized for MCG failure reporting during SCG suspension. This universal usage of the PUCCH channel avoids the need to create separate dedicated failure reporting mechanisms, thereby reducing the increase in device complexity while achieving low-latency failure notification

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12432579B2Radio link failure reporting for master cell group during secondary cell group suspension

Publication Date: 2025.09.30 LG ELECTRONICS INC

AI summary

A method and apparatus for master cell group (MCG) radio link failure (RLF) reporting during secondary cell group (SCG) suspension in a wireless communication system is provided. A wireless device detects a failure on a master cell group (MCG) while a secondary cell group (SCG) is suspended, and transmits MCG failure information informing the failure on the MCG by using a physical uplink control channel (PUCCH) format via the SCG, based on unavailability of physical uplink shared channel (PUSCH) transmission via the SCG.