Wireless Communication Node Buffer Status Transmission for MCG Recovery

Solution Overview

Problem

Current wireless communication systems face challenges in rapidly recovering an Master Cell Group (MCG) link after a Radio Link Failure (RLF) occurs, especially when the Secondary Cell Group (SCG) is deactivated, leading to delays in data transmission and increased energy consumption.

Innovation Solution

A method is introduced where, upon detecting an RLF, the system determines the state of the SCG and transmits specific messages to either recover the radio link or re-establish the connection, activating the SCG from a dormant state to facilitate rapid recovery without triggering unnecessary Radio Resource Control (RRC) connection re-establishment, thereby reducing energy consumption and improving data transmission efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the SCG is deactivated to save energy, then energy consumption is reduced, but the ability to rapidly recover from MCG RLF is worsened

Engineering Contradiction:

Improveenergy consumptionVSAvoidMCG link recovery capability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The system performs preliminary action by maintaining the SCG in a deactivated state with preserved configuration information, allowing it to be quickly activated and used for MCG recovery without full re-establishment procedures. The SCG is pre-configured but not actively monitored, enabling fast transition from deactivated to active state when needed.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically transitions the SCG between deactivated and activated states based on operational needs. When MCG is functioning normally, SCG remains deactivated to save energy. When MCG experiences RLF, SCG is quickly activated to provide recovery path, demonstrating dynamic state adjustment to balance energy efficiency and reliability.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the SCG is activated to enable rapid MCG recovery, then reliability is improved, but energy consumption increases

Engineering Contradiction:

ImproveMCG link recovery capabilityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system performs preliminary action by maintaining the SCG in a deactivated state with preserved configuration information, allowing it to be quickly activated and used for MCG recovery without full re-establishment procedures. The SCG is pre-configured but not actively monitored, enabling fast transition from deactivated to active state when needed.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically transitions the SCG between deactivated and activated states based on operational needs. When MCG is functioning normally, SCG remains deactivated to save energy. When MCG experiences RLF, SCG is quickly activated to provide recovery path, demonstrating dynamic state adjustment to balance energy efficiency and reliability.

Inventive Principle:

Principle #15Dynamics

3Reliability

If RRC connection re-establishment is triggered for MCG RLF, then connection reliability is ensured, but data transmission delay increases

Engineering Contradiction:

Improveconnection reliabilityVSAvoiddata transmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system segments the recovery process by separating MCG failure recovery from full RRC connection re-establishment. Instead of triggering complete re-establishment, the system uses the SCG as a separate recovery path, allowing selective recovery of affected bearers while maintaining other connections, thus reducing overall recovery time.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The SCG acts as an intermediary for MCG recovery. Instead of directly re-establishing the MCG connection through full RRC procedures, the system uses the SCG as a mediator to maintain connectivity and facilitate smoother transition, reducing the impact of MCG failures on overall connection stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20240049329A1Method and deviceused in communication node for wireless communication

Publication Date: 2024.02.08 APOGEE 5G GLOBAL LLC

AI summary

The present disclosure provides a method and device used in a communication node for wireless communications. a first receiver, generates first information, and the first information indicates a buffer state of a first serving cell group; and a first transmitter, when the first serving cell group is in an active state, transmits the first information through the first serving cell group; and when the first serving cell group is in an inactive state, transmits the first information through the second serving cell group; wherein the first serving cell group and the second serving cell group are respectively an SCG and an MCG. The present application activates a first cell group by timely transmitting buffer status by an MCG in active state, thereby reducing the delay for data transmission on a first cell group.