Terminal Context Release Timing for MR-DC Cell Group Handover

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Solution Overview

Problem

Existing communication systems face issues with long-term resource occupancy and increased signaling overhead due to the selective activation of cell groups in multi-radio dual connectivity (MR-DC) scenarios, leading to delayed handovers and increased interruption durations.

Innovation Solution

Implementing selective activation of cell groups, allowing network devices to provide pre-configured candidate cell groups for activation or deactivation without reconfiguration, and using inter-node messages to manage terminal context release, thereby reducing resource occupancy and signaling overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If terminal context is retained in source node for selective cell group activation, then handover flexibility is improved, but resource occupancy increases

Engineering Contradiction:

Improvehandover flexibilityVSAvoidresource occupancy

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The source node performs preliminary terminal context release before the handover is fully completed. The source node receives handover execution indication from the target node, then releases the terminal context in advance, rather than waiting for the handover to complete. This preliminary action reduces resource occupancy while maintaining handover flexibility through proper sequencing of release operations.

Inventive Principle:

Principle #10Preliminary action

2Quantity of substance

If terminal context is released early in source node, then resource occupancy is reduced, but handover interruption duration increases

Engineering Contradiction:

Improveresource occupancyVSAvoidhandover interruption duration

Core Design Contradiction:

Quantity of substanceVSLoss of time

Solution Approach 1:

The patent implements dynamic control of terminal context release timing based on handover state. The source node determines whether to release terminal context based on receiving handover execution indication from target node. This dynamic approach allows the system to optimize between resource occupancy and interruption duration by adapting the release timing to actual handover progression, rather than using fixed release rules.

Inventive Principle:

Principle #15Dynamics

3Productivity

If selective cell group activation is implemented, then network resource efficiency is improved, but signaling overhead increases

Engineering Contradiction:

Improvenetwork resource efficiencyVSAvoidsignaling overhead

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent extracts and processes only the essential handover execution indication from the handover request message. The source node parses the handover request to extract the critical execution indication, then releases terminal context based on this extracted information. This extraction approach reduces signaling overhead by focusing only on necessary information rather than processing entire message structures, while maintaining network resource efficiency through targeted context release.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS20260082292A1Resource release methods and apparatuses, and storage medium

Publication Date: 2026.03.19 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

A release method and apparatus, and a storage medium. The method includes: receiving a node-to-node message sent by a service node, a source node being a network node that supports communication of a user-side device before a cell change occurs to the user-side device, the service node being a network node that supports communication of the user-side device after a cell change occurs to the user-side device, the user-side device being configured with a mobility operation, and the mobility operation comprising cell group selective activation; and according to the node-to-node message, performing terminal context release.