SRB Capability Synchronization for Fast Radio Link Recovery

Solution Overview

Problem

In dual-connectivity or multi-connectivity operations, the Master Node (MN) lacks knowledge of the Signaling Radio Bearer (SRB) capabilities at the Secondary Node (SN) for fast recovery of primary radio link failures, leading to erroneous configurations and a low success rate of fast recovery.

Innovation Solution

Implementing information synchronization methods to configure and send messages between MN and SN to share information about SRBk capabilities and states for fast recovery, enabling informed configuration of UE for primary radio link failure recovery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the MN performs RRC reconfiguration via SRB3 without knowing the SRB3 capability at SN, then fast recovery of primary radio link failure can be attempted, but erroneous configuration occurs resulting in low success rate

Engineering Contradiction:

Improvesuccess rate of fast recoveryVSAvoidknowledge of SRB capability at SN

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The SN performs preliminary configuration of the SRB3 capability and state before the MN attempts fast recovery. The SN configures whether the SRB3 has the capability to support fast recovery and whether it is in a state supporting fast recovery, then sends this configuration information to the MN in advance via Xn/X2 interface, so that the MN can make informed decisions about fast recovery configuration.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The SN provides feedback information to the MN about the SRB3 capability and state. Through the Xn/X2 interface, the SN sends feedback messages containing the capability indicator and state indicator to the MN, enabling the MN to adjust its fast recovery configuration based on the actual SRB3 status at the SN side.

Inventive Principle:

Principle #23Feedback

2Reliability

If information synchronization between MN and SN is implemented, then accurate configuration for fast recovery is achieved, but signaling overhead and complexity increase

Engineering Contradiction:

Improveaccuracy of configurationVSAvoidcomplexity of information synchronization

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts only the essential information needed for fast recovery configuration from the complex SRB3 status. Instead of synchronizing all SRB3 parameters, only the capability indicator and state indicator are extracted and transmitted between MN and SN, reducing the information synchronization overhead while maintaining configuration accuracy.

Inventive Principle:

Principle #2Taking out (Extraction)

3Speed

If SRB3 is used for fast recovery without proper capability verification, then recovery speed is improved, but configuration errors lead to failed recovery

Engineering Contradiction:

Improverecovery speedVSAvoidconfiguration accuracy

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The SN performs preliminary configuration of the SRB3 capability and state before the MN attempts fast recovery. The SN configures whether the SRB3 has the capability to support fast recovery and whether it is in a state supporting fast recovery, then sends this configuration information to the MN in advance via Xn/X2 interface, so that the MN can make informed decisions about fast recovery configuration.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The SN provides feedback information to the MN about the SRB3 capability and state. Through the Xn/X2 interface, the SN sends feedback messages containing the capability indicator and state indicator to the MN, enabling the MN to adjust its fast recovery configuration based on the actual SRB3 status at the SN side.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12507089B2Information synchronization method and apparatus, electronic device, and computer readable storage medium

Publication Date: 2025.12.23 ZTE CORP

AI summary

An information synchronization method applied to a secondary node is provided. The method includes: configuring first information, wherein the first information includes at least one of: whether a Signaling Radio Bearer (SRB) k corresponding to the secondary node has a capability of supporting fast recovery of a primary radio link failure; and whether the SRBk corresponding to the secondary node is in a state of supporting fast recovery of the primary radio link failure, wherein k is any integer greater than or equal to 3, and different secondary nodes corresponding to the same master node correspond to different values of k; and sending a first message to a first master node, wherein the first message carries the first information. An information synchronization apparatus, an electronic device, and a computer readable storage medium are also provided.