SCG Random Access Control in Multi-Connectivity RRC Reconfiguration

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Solution Overview

Problem

Existing wireless communication systems face limitations in communication flexibility and efficiency when multiple connections are utilized, particularly in scenarios involving dual connectivity with different schedulers.

Innovation Solution

The implementation of a method for receiving and sending Radio Resource Control (RRC) messages that include secondary cell group (SCG) configuration parameters, enabling the UE to order a medium access control (MAC) of the SCG to initiate a random access procedure, and the eNB to control this process, thereby optimizing the addition of SCG.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple connections are utilized for communication, then communication capacity and speed are improved, but communication flexibility and efficiency are limited

Engineering Contradiction:

Improvecommunication capacityVSAvoidcommunication flexibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent segments the cell groups into Master Cell Group (MCG) and Secondary Cell Group (SCG), with independent MAC entities for each. This segmentation allows independent control and random access procedures for SCG, improving communication flexibility while maintaining multiple connections for high capacity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent enables dynamic addition and configuration of SCG through RRC connection reconfiguration messages. The SCG can be dynamically added, modified, or released based on network conditions, providing adaptability while maintaining multiple active connections for sustained high throughput

Inventive Principle:

Principle #15Dynamics

2Speed

If multiple connections are utilized for communication, then communication speed is improved, but communication efficiency is limited

Engineering Contradiction:

Improvecommunication speedVSAvoidcommunication efficiency

Core Design Contradiction:

SpeedVSProductivity

Solution Approach 1:

The patent enables the SCG MAC entity to autonomously initiate random access procedures when configured by RRC. This self-service mechanism eliminates the need for network-controlled access for each SCG addition, improving communication efficiency while maintaining high-speed multi-connection operation

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If SCG addition is implemented, then communication flexibility is improved, but random access procedure control is complex

Engineering Contradiction:

Improvecommunication flexibilityVSAvoidprocedure control complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent uses RRC connection reconfiguration messages to pre-configure SCG addition parameters and random access procedures before actual SCG activation. This preliminary configuration simplifies the execution phase by having all necessary parameters prepared in advance, reducing control complexity while maintaining flexibility

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP4492906B1Systems and methods for multi-connectivity operation

Publication Date: 2026.04.15 SHARP KK

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AI summary

A method for receiving a radio resource control (RRC) message by a user equipment (UE) is described. The method includes receiving an RRC connection reconfiguration message including secondary cell group (SCG) configuration parameters for SCG addition. Based on receiving the RRC connection reconfiguration message including SCG configuration parameters for SCG addition, the method also includes ordering, by an RRC of the UE, a medium access control (MAC) of the SCG of the UE to initiate a random access procedure.