Base Station Handover Threshold Management

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Solution Overview

Problem

Existing wireless base station technologies face challenges in efficiently managing load, particularly when handling numerous control signals from user terminals, which can lead to increased processing loads and potential handover failures.

Innovation Solution

The proposed solution involves dynamically adjusting the handover threshold for user terminals connecting to the wireless base station. When the base station's load increases, the handover threshold is raised to suppress handovers, thereby reducing the number of measurement reports received and processed. Conversely, when the load decreases, the threshold is lowered to allow more handovers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the base station processes all measurement reports from user terminals, then handover decisions can be made accurately, but the processing load of the base station increases

Engineering Contradiction:

Improvehandover decision accuracyVSAvoidbase station processing load

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent extracts the measurement report processing function from the base station and relocates it to the management device. The base station only receives handover threshold information from the management device, while the management device handles the computationally intensive measurement report analysis, thereby reducing the base station's processing load while maintaining handover decision accuracy.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The management device acts as an intermediary between user terminals and the base station. It collects measurement reports from terminals, processes them to determine appropriate handover thresholds, and provides these thresholds to the base station, which then uses them to make handover decisions without directly processing the raw measurement reports.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the handover threshold is lowered to allow more handovers, then user mobility is better supported, but the base station load increases due to more measurement reports

Engineering Contradiction:

Improveuser mobility supportVSAvoidbase station load

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The handover threshold is made dynamic rather than static. The management device continuously adjusts the handover threshold based on current network conditions and base station load, allowing the system to support user mobility when load is low while reducing unnecessary handovers when load is high, thus adapting to changing conditions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements a feedback mechanism where the management device monitors base station load and measurement report volume, then adjusts the handover threshold accordingly. This closed-loop control ensures that the threshold adapts to current conditions, balancing mobility support with load management.

Inventive Principle:

Principle #23Feedback

3Productivity

If the handover threshold is raised to suppress handovers, then base station load is reduced, but handovers for terminals with deteriorated signal conditions may be unduly suppressed

Engineering Contradiction:

Improvebase station load reductionVSAvoidhandover reliability for deteriorated signals

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The management device applies different handover threshold adjustments to different user terminals based on their individual conditions. Terminals with deteriorated signal conditions receive more favorable handover thresholds compared to terminals with good signal conditions, ensuring that local needs are met while maintaining overall load reduction.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system changes the handover threshold parameter dynamically based on terminal-specific conditions. The management device analyzes measurement reports to identify terminals with deteriorated signals and provides them with adjusted thresholds that prevent undue suppression, while maintaining higher thresholds for other terminals to reduce overall load.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12342235B2Base station device, system, computer-readable storage medium, flying object, method, management device, and management method

Publication Date: 2025.06.24 SOFTBANK CORPORATION

AI summary

Provided is a base station device configured to form a cell to provide a wireless communication service to a user terminal within the cell, the base station device comprising: a handover threshold storing unit for storing a handover threshold which is set for the user terminal that starts a wireless connection to the base station device, a load determining unit for determining whether a load condition indicating that a load of the base station device is high is satisfied or not, and a handover threshold change unit for changing the handover threshold so as to suppress a handover from the base station device of a user terminal which establishes a wireless connection with the base station device when it is determined that the load condition is satisfied.