Conditional Handover Signaling for Early Data Forwarding

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Solution Overview

Problem

In wireless communication systems, the autonomous handover procedures by user equipment (UE) can lead to communication disruptions and data loss due to the source network node being unaware of the handover, resulting in inefficient and resource-intensive data forwarding processes.

Innovation Solution

The UE predicts handover conditions and transmits an early conditional handover (CHO) indication to the source network node, enabling mid-data forwarding before the actual handover execution, allowing the source node to prepare data transfer to the target node.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the UE autonomously performs handover without notifying the source network node, then handover execution speed is improved, but communication reliability deteriorates due to data loss and disruptions

Engineering Contradiction:

Improvehandover execution speedVSAvoidcommunication reliability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The UE sends an early CHO indication to the source network node before executing the handover. This preliminary notification allows the source node to prepare data forwarding to the target node in advance, ensuring communication reliability is maintained while still enabling fast autonomous handover execution.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the source network node performs data forwarding after handover execution, then data forwarding efficiency is improved, but communication stability deteriorates due to disruptions during handover

Engineering Contradiction:

Improvedata forwarding efficiencyVSAvoidcommunication stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The source network node receives the early CHO indication and performs data forwarding to the target node before the handover is executed. This preliminary data forwarding action ensures communication stability by avoiding disruptions during handover, while also improving data forwarding efficiency through proactive preparation.

Inventive Principle:

Principle #10Preliminary action

3Loss of energy

If the UE transmits early CHO indication before handover execution, then resource usage is optimized through proactive data forwarding, but system complexity increases due to additional signaling

Engineering Contradiction:

Improveresource usage efficiencyVSAvoidsystem complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent extracts only the essential early CHO indication signaling from the complete handover procedure. This minimal additional signaling enables proactive data forwarding and resource optimization without significantly increasing system complexity, as the core handover execution remains autonomous and unchanged.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS20260075495A1Early conditional handover procedure

Publication Date: 2026.03.12 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an early conditional handover (CHO) indication configuration including a set of one or more early CHO indication activation parameters for transmitting an early CHO indication. The UE may transmit, to a source network node in accordance with the early CHO indication configuration, the early CHO indication prior to at least one CHO execution condition being satisfied, the early CHO indication including a set of parameters for middle data forwarding during a CHO procedure. In some aspects, the CHO procedure includes at least one of a Layer 1 handover procedure or a Layer 3 handover procedure. Numerous other aspects are described.