Mobile Terminal Handover Latency Reduction via Critical Scenario Detection

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Solution Overview

Problem

Mobile communication terminals experience excessive handover latency due to poor radio link conditions, leading to delayed handover procedures and degraded user experience, particularly when interference from neighboring cells causes high block error rates.

Innovation Solution

A mobile terminal device is configured to detect critical scenarios of increased interference by monitoring signal characteristics and adjust measurement reporting parameters to expedite handover processes, using alternate measurement reporting protocols that reduce expected handover latency by biasing measurement reports and adjusting event-triggered parameters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the mobile terminal waits for stable radio conditions before handover, then handover reliability improves, but handover latency increases excessively

Engineering Contradiction:

Improvehandover reliabilityVSAvoidhandover latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The mobile terminal performs preliminary actions by detecting critical interference scenarios and triggering accelerated measurement reporting before handover is actually needed. The terminal monitors signal characteristics, identifies when interference from neighboring cells is increasing, and proactively switches to accelerated reporting mode to expedite handover preparation, rather than waiting passively for radio conditions to stabilize.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The measurement reporting behavior dynamically adapts based on detected radio conditions. The terminal switches between default measurement reporting mode and accelerated measurement reporting mode depending on whether critical interference scenarios are detected. This dynamic adjustment allows the system to optimize between normal operation efficiency and handover urgency based on real-time conditions.

Inventive Principle:

Principle #15Dynamics

2Measurement precision

If the mobile terminal uses default measurement reporting, then measurement accuracy is maintained, but handover latency becomes excessive under interference

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidhandover latency

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The terminal changes measurement reporting parameters by switching between default and accelerated reporting modes. When critical interference scenarios are detected, the terminal modifies reporting behavior to increase measurement frequency and reduce reporting intervals, thereby accelerating handover preparation while maintaining sufficient measurement accuracy to make reliable handover decisions.

Inventive Principle:

Principle #35Parameter changes

3Loss of time

If the mobile terminal detects critical interference scenarios, then handover timing is optimized, but processing complexity increases

Engineering Contradiction:

Improvehandover latencyVSAvoidprocessing complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The terminal implements feedback mechanisms by continuously monitoring signal characteristics and comparing them against thresholds to detect critical interference scenarios. This feedback loop enables the terminal to automatically adjust measurement reporting behavior based on detected conditions, optimizing handover timing while keeping processing complexity manageable through rule-based detection and response.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10798623B2Method for processing radio signals and mobile terminal device

Publication Date: 2020.10.06 APPLE INC

AI summary

A mobile terminal device may include a measurement circuit, a critical scenario identification circuit, and a measurement report control circuit. The measurement circuit may be configured to measure one or more received radio signals to generate one or more measurement results. The critical scenario identification circuit may be configured to perform a comparison between a first set of the one or more measurement results and predefined criteria associated with handover disruption. The measurement report control circuit may be configured to select a selected reporting configuration from a default handover speed reporting configuration and an accelerated handover speed reporting configuration based on the comparison, wherein the accelerated handover speed reporting configuration produces a lower expected handover latency than the default handover speed reporting configuration and to transmit a second set of the one or more measurement results according to the selected reporting configuration.