Dual-Connectivity Resume Using Source SN RRC Configuration Transfer

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Solution Overview

Problem

The reconfiguration of the secondary node (SN) in the NR-DC mode of 5G communication systems is time-consuming, leading to lower throughput and poor user experience during cross-site resume procedures in NR-DC communication.

Innovation Solution

A method for resuming a communicational connection by acquiring RRC configuration information from the source SN, determining a target SN, and instructing the target SN to complete configuration efficiently, thereby enhancing SN configuration efficiency and reducing throughput impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the target MN reconfigures the target SN from scratch during cross-site resume, then the dual-connectivity configuration is complete, but the reconfiguration process is time-consuming and reduces throughput

Engineering Contradiction:

Improvedual-connectivity configuration completenessVSAvoidSN reconfiguration time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The source SN retains and maintains configuration information in advance before the UE moves to the target MN. When resume is triggered, this pre-prepared configuration information can be quickly transferred to the target SN, eliminating the need for time-consuming from-scratch configuration and enabling rapid restoration of dual-connectivity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The configuration information from the source SN is copied and transferred to the target SN during the cross-site resume process. Instead of creating new configuration, the system replicates the proven working configuration from the source, significantly reducing configuration time while maintaining reliability

Inventive Principle:

Principle #26Copying

2Manufacturing precision

If the target MN waits for target SN configuration before resuming dual-connectivity, then configuration accuracy is ensured, but throughput is reduced and user experience deteriorates

Engineering Contradiction:

Improveconfiguration accuracyVSAvoidthroughput during resume

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

Configuration information is prepared and validated in advance by the source SN before the UE actually needs to resume connectivity. This preliminary preparation ensures configuration accuracy is already verified, allowing the target MN to immediately activate dual-connectivity without waiting for post-arrival configuration

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The configuration process continues seamlessly during the handover transition. By using the source SN's pre-prepared configuration, the system maintains continuous useful action rather than interrupting throughput for configuration, ensuring both accuracy and sustained productivity during the resume process

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS12513579B2Communication connection resuming method, base station and computer-readable storage medium

Publication Date: 2025.12.30 ZTE CORP

AI summary

A communication connection resuming method, a base station and a computer-readable storage medium are disclosed. The method may include, sending a UE information acquisition request to the source MN, in response to a reception of a radio resource control (RRC) Resume request sent by the UE; acquiring RRC configuration information of the source SN fed back by the source MN; determining a target SN, and sending RRC configuration information to the target SN, to instruct the target SN to complete a configuration according to the RRC configuration information; and resuming a dual-connectivity communication of the UE in cooperation with the target SN with the configuration completed.