MR-DC Mobility Configuration Updates for Fast Cell Group Changes

Solution Overview

Problem

The existing conditional handover and cell group change processes in multi-radio dual connectivity (MR-DC) require reconfiguration or initialization, leading to increased signaling overhead and time delay, especially in scenarios with frequent cell group changes.

Innovation Solution

The implementation of selective activation of cell groups allows terminals to maintain mobility configurations without reconfiguration or initialization, using update and cancel messages to manage mobility operations between network devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal releases the CHO/CPC/CPA configuration when completing random access to the target PCell/PSCell, then the mobility configuration is cleared, but the network needs to reconfigure or initialize the configuration for future mobility operations, increasing signaling overhead and time delay

Engineering Contradiction:

Improvemobility configuration managementVSAvoidhandover time delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The network device pre-configures mobility parameters and conditions for multiple potential target cells before handover occurs. The terminal maintains these pre-configured parameters locally, so when handover is triggered, the terminal can immediately execute the handover using existing configuration without waiting for network reconfiguration messages, thus reducing handover time delay

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal maintains a local copy of the mobility configuration parameters received from the network device. This local copy allows the terminal to perform mobility operations independently without continuously communicating with the network device, reducing signaling overhead while ensuring configuration consistency through periodic updates

Inventive Principle:

Principle #26Copying

2Adaptability or versatility

If the terminal releases the CHO/CPC/CPA configuration when completing random access to the target PCell/PSCell, then the configuration is cleared, but reconfiguration is needed for frequent cell group changes, increasing signaling overhead

Engineering Contradiction:

Improvecell group change capabilityVSAvoidsignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The network device pre-configures mobility parameters and conditions for multiple potential target cells before handover occurs. The terminal maintains these pre-configured parameters locally, so when handover is triggered, the terminal can immediately execute the handover using existing configuration without waiting for network reconfiguration messages, thus reducing handover time delay

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal maintains a local copy of the mobility configuration parameters received from the network device. This local copy allows the terminal to perform mobility operations independently without continuously communicating with the network device, reducing signaling overhead while ensuring configuration consistency through periodic updates

Inventive Principle:

Principle #26Copying

Data Source

PatentUS20260040196A1Mobility configuration method and apparatus

Publication Date: 2026.02.05 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

A mobility configuration method and a communication device are provided. The method is performed by a first network device, and includes: sending an update message or a cancel message to a second network device. The update message is configured to update a mobility configuration of a terminal, and the cancel message is configured to cancel a mobility operation corresponding to the first network device in the terminal.