Timing Advance Reporting with Applied-Time Information

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In non-terrestrial networks, the dynamic change in the position of terminals and satellites leads to inaccuracies in time advance (TA) values reported to network devices, exceeding scheduling granularity during long uplink transmissions, causing inconsistent understanding between terminals and network devices.

Innovation Solution

Terminals report TA value information including the time when the TA value is applied, allowing network devices to accurately determine the TA value, ensuring consistent understanding and improved scheduling accuracy by including time-related information in MAC CEs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the terminal reports the TA value to the network device, then the network device can obtain the TA value for scheduling, but the TA value may have changed during the reporting process causing inaccuracy

Engineering Contradiction:

ImproveTA value accuracyVSAvoidTA value change during reporting

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The terminal performs preliminary calculation of multiple TA values corresponding to different time points before reporting. Instead of calculating a single TA value at the moment of reporting, the terminal pre-calculates a sequence of TA values that reflect the dynamic changes during the uplink transmission period, ensuring the network device receives accurate TA information for scheduling decisions.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The single TA value reporting is segmented into multiple TA values corresponding to different time points. The terminal divides the TA value information into a sequence {TA1, TA2, ..., TAn} where each TAi corresponds to a specific time point, allowing the network device to select the appropriate TA value for its scheduling needs.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If the terminal performs piecewise adjustment on the TA value based on dynamic position, then the TA value remains accurate for current position, but the network device cannot know the adjustment value

Engineering Contradiction:

ImproveTA value accuracy for current positionVSAvoidTA adjustment value unknown to network device

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The terminal provides feedback to the network device by reporting the sequence of TA values that reflect the piecewise adjustments made based on dynamic position changes. This feedback mechanism allows the network device to understand the TA adjustment values and make informed scheduling decisions without requiring the terminal to reveal its internal position calculation methods.

Inventive Principle:

Principle #23Feedback

3Productivity

If the terminal reports TA value during long uplink transmission, then the network device can schedule resources, but the TA value exceeds scheduling granularity due to dynamic position changes

Engineering Contradiction:

Improveuplink transmission capabilityVSAvoidscheduling granularity alignment

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent transitions from static TA value reporting to dynamic TA value reporting. The terminal reports a sequence of TA values that dynamically adapt to position changes during long uplink transmissions. Each TA value in the sequence corresponds to a specific time point, allowing the scheduling granularity to align with the dynamic TA changes throughout the transmission period.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250247879A1Timing advance value reporting method and apparatus, and storage medium

Publication Date: 2025.07.31 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

A method for reporting a timing advance (TA) value. The method includes: sending TA value information to a network device, in which the TA value information includes at least information of time when a TA value determined by a terminal is applied.