Terminal GNSS Timing for Accurate TA Reporting in IoT Links

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Solution Overview

Problem

Terminal devices with weak capabilities, such as IoT devices, face inaccuracies in timing advance (TA) values due to the simultaneous inability of their GNSS and communication modules to operate concurrently, leading to synchronization issues.

Innovation Solution

Implementing a method where terminal devices obtain GNSS location information within a dedicated time period, prohibiting TA reporting during this period, and allowing it only after accurate location information is obtained, thereby preventing inaccurate TA reporting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the terminal device triggers TA reporting during GNSS measurement, then the TA reporting frequency is improved, but the TA accuracy deteriorates due to using outdated location information

Engineering Contradiction:

ImproveTA reporting frequencyVSAvoidTA accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent applies preliminary action by prohibiting TA reporting during the GNSS measurement time period in advance. This prevents the terminal device from reporting inaccurate TA values that would be calculated using outdated location information, ensuring that TA reporting only occurs when accurate GNSS location data is available.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements periodic action by establishing a specific time period structure where GNSS measurement and TA reporting are separated. The terminal device performs GNSS measurement during a dedicated time period and triggers TA reporting only after this period, creating a periodic cycle that ensures accuracy while maintaining reporting functionality.

Inventive Principle:

Principle #19Periodic action

2Measurement precision

If the terminal device obtains GNSS location information in a dedicated time period, then the TA accuracy is improved, but the communication time is reduced

Engineering Contradiction:

ImproveTA accuracyVSAvoidcommunication time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies segmentation by dividing the time period into distinct segments: a GNSS measurement time period where location information is obtained, and a communication time period where normal communication operations occur. This segmentation allows the terminal device to dedicate specific time to GNSS measurement without continuously interrupting communication, thereby improving TA accuracy while minimizing communication time loss.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the time parameter by configuring a specific duration for the GNSS measurement time period. By adjusting this time parameter, the system can balance between obtaining accurate TA values and maintaining sufficient communication time, allowing flexibility in optimizing the trade-off between measurement precision and communication efficiency.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250380202A1Communication method and apparatus

Publication Date: 2025.12.11 HUAWEI TECH CO LTD

AI summary

This application provides a communication method. The method includes: A terminal device obtains GNSS location information in a preset time period, where a moment at which the terminal device starts to obtain the GNSS location information is a first moment, and a moment at which the terminal device completes obtaining the GNSS location information is a second moment. The terminal device allows triggering a CHO after the second moment; or the terminal device is prohibited from triggering the CHO in the preset time period; or the terminal device allows triggering the CHO in the preset time period.