TDD Satellite Frame Scheduling With Timing Error Compensation

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Solution Overview

Problem

Existing satellite communication systems face challenges in efficiently utilizing spectrum resources and managing timing errors due to satellite mobility, particularly in time division duplex (TDD) systems, which affect data transmission and reception quality.

Innovation Solution

A method for configuring frame structures and resource scheduling schemes in TDD non-geosynchronous satellite communications, including Doppler frequency offset compensation, subcarrier spacing determination, and timing error compensation, to optimize data transmission and reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If TDD is used to flexibly configure uplink and downlink durations, then spectrum utilization is improved, but timing error management becomes more complex due to satellite mobility

Engineering Contradiction:

Improvespectrum utilizationVSAvoidtiming error management

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by performing timing error compensation in advance before data transmission. The satellite or ground station calculates timing errors based on orbital parameters and performs compensation adjustments beforehand, ensuring synchronized communication without real-time complexity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback mechanisms where timing error information is continuously monitored and fed back to adjust resource scheduling. The system measures timing deviations and uses this feedback to dynamically adjust uplink and downlink time slots, maintaining synchronization despite satellite mobility.

Inventive Principle:

Principle #23Feedback

2Reliability

If resource scheduling is dynamically adjusted based on satellite position, then communication quality is improved, but system overhead increases

Engineering Contradiction:

Improvecommunication qualityVSAvoidsystem overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent changes parameters by using orbital elements and satellite position data to dynamically adjust communication parameters such as timing advance values and frequency offsets. This allows adaptive resource scheduling that maintains communication quality while using efficient parameter representation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the resource scheduling into different time slots and frequency resources based on satellite position and service requirements. By dividing resources into manageable segments, the system can efficiently manage timing and frequency adjustments without excessive overhead.

Inventive Principle:

Principle #1Segmentation

3Loss of information

If channel reciprocity is used to avoid separate channel estimation, then system overhead is reduced, but accuracy may be affected by Doppler shifts

Engineering Contradiction:

Improvesystem overheadVSAvoidchannel estimation accuracy

Core Design Contradiction:

Loss of informationVSMeasurement precision

Solution Approach 1:

The patent applies preliminary anti-action by performing Doppler frequency offset compensation before channel estimation. The system calculates and compensates for expected Doppler shifts based on satellite orbital parameters, preventing accuracy degradation from occurring in the first place.

Inventive Principle:

Principle #9Preliminary anti-action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enhances spectrum utilization and reduces demodulation errors by dynamically adapting to satellite motion, ensuring robust and efficient data transmission and reception in TDD systems.

Implementation Method 1

Doppler frequency offset compensation

Methodology Applied

Scientific EffectDoppler effect: Doppler Effect

Implementation Method 2

timing error compensation is performed on the resource scheduling scheme based on a timing advance obtained by time-frequency synchronization

Methodology Applied

Scientific EffectTime-frequency synchronization:

Data Source

PatentUS12567901B2Method and device for time division duplex asynchronous satellite communications, and storage medium

Publication Date: 2026.03.03 BEIJING UNIV OF POSTS & TELECOMM

AI summary

A method and an apparatus v are provided. The method includes: configuring a frame structure and related parameters of a satellite based on a channel feature, a service feature, and a transmission/reception unit capability; determining a resource scheduling scheme based on configuration information of the frame structure and related parameters and historical resource scheduling information; and performing a timing error compensation on the resource scheduling scheme based on a timing advance obtained by time-frequency synchronization, and performing a data transmission/reception based on the resource scheduling scheme after the timing error compensation.