SRB3 MCG Abnormality Reporting in Dual Connectivity

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Solution Overview

Problem

In dual connectivity architectures, MCG abnormalities lead to transmission interruptions on both the MCG and SCG sides due to the RRC connection reestablishment procedure, which causes disruptions in RRC signaling transmission.

Innovation Solution

The terminal reports MCG abnormality information via SRB3, allowing for RRC connection reconfiguration without triggering the RRC connection reestablishment procedure, thereby avoiding transmission interruptions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the RRC connection reestablishment procedure is triggered due to MCG abnormality, then the RRC connection can be recovered, but transmission interruptions occur on both MCG and SCG sides

Engineering Contradiction:

ImproveRRC connection recoveryVSAvoidtransmission interruption

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent segments the control plane signaling by establishing SRB3 as a dedicated signaling bearer for SCG-specific RRC messages, separating it from the MCG-based SRB1 and SRB2. This segmentation allows the SCG to independently report MCG abnormalities and receive reconfiguration commands without involving the MCG, thus avoiding transmission interruptions on both sides simultaneously.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces SRB3 as an intermediary signaling channel that enables direct communication between the UE and the network for SCG-related RRC messages. This intermediary bearer acts as a separate communication path that does not depend on the MCG's transmission status, allowing abnormality reporting and reconfiguration to proceed independently of MCG conditions.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the RRC connection reestablishment procedure is performed, then the RRC connection can be recovered, but RRC signaling transmission is disrupted

Engineering Contradiction:

ImproveRRC connection recoveryVSAvoidRRC signaling transmission

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent segments RRC signaling into MCG-based signaling (SRB1, SRB2) and SCG-based signaling (SRB3). By routing MCG abnormality reporting and related RRC signaling through SRB3 on the SCG side, the system ensures that RRC signaling transmission continues uninterrupted on the SCG even when MCG abnormalities occur, preventing information loss.

Inventive Principle:

Principle #1Segmentation

3Loss of time

If the SRB3 is used for MCG abnormality reporting, then transmission interruptions are avoided, but the signaling bearer complexity increases

Engineering Contradiction:

Improvetransmission interruptionVSAvoidsignaling bearer structure

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent implements SRB3 as a multi-functional signaling bearer that handles both normal SCG RRC messaging and MCG abnormality reporting. This universal bearer design consolidates multiple functions into a single structured mechanism, managing the complexity through standardized procedures rather than requiring separate dedicated channels for each function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12069501B2Information reporting method and apparatus, terminal and network-side device

Publication Date: 2024.08.20 DATANG MOBILE COMM EQUIP CO LTD

AI summary

An information reporting method and apparatus, terminal and network-side device are provided. One implementation of the information reporting method is applied to a terminal and includes: reporting, in a case that that an abnormality is detected in a master cell group (MCG), MCG abnormality information via a signaling radio bearer 3 (SRB3).