Inter-system Handover Evaluation and Reporting Mechanism

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Solution Overview

Problem

Current base stations cannot determine whether an inter-system handover of a terminal is necessary, leading to unreasonable and unnecessary handovers due to unreasonably set signal parameter thresholds.

Innovation Solution

A handover evaluation and report method is implemented, where a source base station sends beam measurement indications, cell measurement strategies, and signal parameter thresholds to a target base station. The target base station instructs the terminal to measure beams and reports the results, allowing the target base station to determine if the handover is necessary and generate a report indicating whether the handover is unnecessary.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the signal parameter threshold for inter-system handover is set high to ensure service quality, then the terminal can maintain good service in NR system, but unnecessary handovers occur when gNB coverage is sufficient

Engineering Contradiction:

Improveservice qualityVSAvoidhandover efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies preliminary action by having the terminal perform beam measurement and cell measurement strategy execution before the handover decision is made. The target base station receives measurement results in advance and evaluates whether handover is necessary based on pre-configured thresholds and measurement configurations, preventing unnecessary handovers while ensuring service quality maintenance.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback mechanism where the terminal reports cell measurement results back to the target base station, which then uses this feedback information to determine whether inter-system handover is necessary. This feedback loop allows the system to adjust handover decisions based on actual measurement data, reducing unnecessary handovers while maintaining reliable service.

Inventive Principle:

Principle #23Feedback

2Productivity

If the signal parameter threshold is set low to prevent unnecessary handovers, then handover efficiency improves, but the terminal may handover when gNB coverage is insufficient

Engineering Contradiction:

Improvehandover efficiencyVSAvoidservice quality

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the parameter evaluation approach by introducing multiple measurement parameters (beam measurement results, cell measurement strategy, signal parameter thresholds) that are evaluated collectively rather than relying on a single threshold. This multi-parameter evaluation system allows the base station to make more accurate handover decisions that balance handover efficiency with service quality reliability.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If beam measurement and cell measurement strategy are implemented, then the accuracy of handover decision improves, but the measurement and reporting process becomes more complex

Engineering Contradiction:

Improvehandover decision accuracyVSAvoidmeasurement process complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the measurement process into distinct components: beam measurement (measuring individual beams) and cell measurement strategy (evaluating overall cell quality). This segmentation allows the terminal to systematically collect and report measurement data in an organized manner, improving handover decision accuracy while managing measurement process complexity through structured approach.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements universality by having the measurement mechanism serve multiple functions: beam measurement not only measures individual beam quality but also contributes to cell-level assessment; the cell measurement strategy serves both as measurement methodology and as handover decision criterion. This multi-functionality reduces overall system complexity by consolidating measurement and decision-making functions.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP3813408B1Switching evaluation and reporting method, device, and base station

Publication Date: 2025.06.11 ZTE CORP

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AI summary

Provided are a handover evaluation and report method, apparatus and a base station. A source base station sends measurement configuration information and necessity evaluation information to a target base station. The target base station instructs the terminal to measure a cell on a source base station side according to the measurement configuration information. In response to determining that an inter-system handover of the terminal is an unnecessary handover according to a cell measurement result sent by the terminal, the target base station generates a system handover report indicating that this handover of the terminal is the unnecessary handover and sends the system handover report to the source base station Thus, the source base station acknowledges, according to the system handover report, an unnecessary inter-system handover is performed by the terminal.