Conditional Handover Management via Base Station Condition Modification

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Solution Overview

Problem

Existing conditional handover procedures in wireless communication systems often lead to network inefficiencies due to inadequate management of handover conditions and configurations by RAN nodes, which can result in lower network capacity, increased radio link failures, and reduced data rates.

Innovation Solution

The proposed solution involves techniques where the source base station provides handover conditions to the candidate base station, which may modify or replace these conditions based on network congestion and other factors. The candidate base station then sends modified conditional handover configurations back to the source base station, enabling the UE to communicate with the candidate base station only when the modified conditions are met.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the source base station provides handover conditions to the candidate base station for modification, then network capacity and data rates are improved, but the device complexity and signaling overhead increase

Engineering Contradiction:

Improvenetwork capacityVSAvoidhandover management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The candidate base station acts as an intermediary that receives handover conditions from the source base station, modifies them based on its local network state (congestion, resource availability), and returns optimized conditions. This intermediary role allows the system to improve network capacity by making locally-informed handover decisions while distributing the complexity across multiple nodes rather than centralizing it.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The handover conditions are prepared and modified in advance before the actual handover event occurs. The source base station provides initial conditions, the candidate base station modifies them preliminarily based on predicted future network state, and the UE receives pre-optimized handover parameters. This preliminary action reduces the complexity during the actual handover execution.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the candidate base station modifies handover conditions based on network congestion, then radio link failures are reduced, but the signaling overhead and processing time increase

Engineering Contradiction:

Improveradio link failure rateVSAvoidhandover preparation time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The candidate base station performs modification of handover conditions in advance, during the handover preparation phase, rather than at the moment of handover execution. By preliminarily adjusting conditions based on current network congestion state, the system reduces radio link failures while the actual handover can proceed more quickly with pre-computed parameters.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The candidate base station uses feedback about its local network state (congestion levels, resource availability) to modify handover conditions. This feedback mechanism allows the system to adapt handover parameters to actual network conditions, reducing failures while the feedback loop is established during the preparation phase rather than adding delay during execution.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If multiple RAN nodes are involved in condition management, then handover optimization is improved, but the coordination complexity and signaling overhead increase

Engineering Contradiction:

Improvehandover optimizationVSAvoidcoordination complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The handover management function is segmented between the source base station, candidate base station, and UE. Each node has specific responsibilities: the source provides initial conditions, the candidate modifies them based on local state, and the UE executes the handover. This segmentation allows multiple RAN nodes to contribute to optimization while distributing complexity across independent functional blocks rather than requiring centralized coordination.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each RAN node makes decisions based on local information quality rather than requiring global coordination. The candidate base station uses its local knowledge of network congestion and resource availability to modify conditions, while the source base station uses its local knowledge of the UE's current state. This local quality approach enables adaptive optimization without complex inter-node coordination protocols.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12219419B2Conditional handover management

Publication Date: 2025.02.04 GOOGLE LLC

AI summary

A source base station receives, from a candidate base station while a user device is operating in a source cell of the source base station, a first message that indicates a conditional handover configuration providing information for user device operation within a candidate target cell of the candidate base station, but does not indicate a corresponding condition for handing over to the candidate target cell. The source base station generates the corresponding condition for handing over to the candidate target cell, and sends, to the user device, a second message that indicates the conditional handover configuration and the corresponding condition.