Intra-Frequency Measurement Triggering for Mobile Terminals

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Solution Overview

Problem

The existing cell reselection process in mobile communications is hindered by narrow threshold value ranges for intra-frequency measurement, leading to inadequate triggering of intra-frequency measurements, especially when base stations are close to each other, resulting in delayed or failed cell reselection.

Innovation Solution

The method involves acquiring and comparing parameter information from the base station, including transmission power, threshold values, and signal quality, to dynamically adjust the mobility parameters, enabling timely intra-frequency measurements and improving cell reselection processes by expanding the threshold value range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal uses the existing intra-frequency measurement triggering criteria with fixed threshold ranges, then the measurement triggering is simple and straightforward, but the measurement may not be triggered timely when base stations are close together or have large power differences

Engineering Contradiction:

Improvecell reselection reliabilityVSAvoidtime delay in triggering intra-frequency measurement

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent introduces dynamic adjustment of the first threshold value based on the terminal's movement state. When the terminal is in a high-speed movement state, the first threshold value is adjusted to a larger value, enabling timely triggering of intra-frequency measurements. This dynamic adaptation resolves the contradiction by making the measurement triggering criterion flexible rather than fixed, ensuring reliability across different movement scenarios without time delay.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter (threshold value) based on the terminal's movement state. By adjusting the first threshold value according to whether the terminal is in a high-speed or low-speed movement state, the system achieves reliable cell reselection timing. This parameter change approach allows the measurement triggering to adapt to different scenarios, resolving the time delay issue while maintaining simplicity.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the base station broadcasts a comprehensive set of mobility parameters including first threshold, second threshold, and movement state information, then the terminal can perform accurate mobility control, but the information overhead and system complexity increase

Engineering Contradiction:

Improvemobility control adaptabilityVSAvoidparameter information complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent enables the terminal to autonomously determine its movement state based on received signal strength changes without requiring the base station to explicitly broadcast movement state information. The terminal compares signal strengths at different time points and self-determines whether it is in a high-speed or low-speed movement state. This self-service approach achieves adaptability while avoiding the complexity of broadcasting comprehensive movement state parameters.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent extracts only the essential information (signal strength at different time points) that the terminal needs to determine its movement state, rather than requiring the base station to broadcast comprehensive movement state parameters. By taking out only the necessary signal strength measurements and letting the terminal perform the movement state determination, the system achieves adaptability with reduced information overhead and complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

3Measurement precision

If the terminal continuously monitors signal strength to determine movement state and trigger measurements, then mobility control accuracy improves, but the power consumption and processing load increase

Engineering Contradiction:

Improvemovement state detection precisionVSAvoidterminal power consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic signal strength monitoring at specific time points (first time point and second time point) rather than continuous monitoring. The terminal determines its movement state by comparing signal strengths at these periodic intervals, which provides sufficient precision for movement state detection while significantly reducing power consumption and processing load compared to continuous monitoring.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS11190994B2Method of triggering intra-frequency measurement of terminal, device thereof, terminal and base station

Publication Date: 2021.11.30 CHINA MOBILE COMM GRP CO LTD

AI summary

A method of triggering an intra-frequency measurement of a terminal, a device of triggering an intra-frequency measurement of a terminal, a terminal and a base station are provided. The method includes: acquiring parameter information sent by a base station and configured to determine whether to trigger an intra-frequency measurement; determining whether to perform the intra-frequency measurement based on the parameter information.