DMRS Bundle Compensation Segments for NTN Uplink Phase Continuity
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Solution Overview
Problem
In non-terrestrial network (NTN) systems, satellite movement causes rapid changes in Doppler shifts and delays, leading to large phase shifts that disrupt phase continuity within the specified time domain window during joint channel estimation using DMRS bundles, which is not adequately addressed by current communications technologies.
Innovation Solution
A method for wireless communication that involves determining frequency compensation segments within a time period based on first information, allowing pre-compensation on uplink channels to maintain phase continuity, especially in NTN systems, by dynamically adjusting the size of actual and configured time domain windows based on satellite movement and antenna switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If joint channel estimation is performed based on DMRS bundle in NTN systems, then channel estimation accuracy is improved, but phase continuity cannot be ensured due to satellite movement causing large phase shifts
Solution Approach 1:
The time period is segmented into multiple frequency compensation segments, with each segment corresponding to one or more DMRS bundles. This segmentation allows independent frequency compensation for each segment, enabling phase continuity to be maintained within each segment while accommodating phase shifts between segments due to satellite movement.
Solution Approach 2:
Frequency compensation is performed in advance for each segmented time period based on predicted satellite movement and Doppler shifts. This preliminary compensation ensures that phase continuity is maintained during joint channel estimation before the actual channel estimation occurs.
2Adaptability or versatility
If the time domain window size is fixed for DMRS bundle, then joint channel estimation can be performed, but it cannot adapt to rapid changes in Doppler shifts and delays caused by satellite movement
Solution Approach 1:
The size of the actual time domain window and configured time domain window is dynamically adjusted based on satellite movement characteristics, antenna switching events, and channel conditions. This dynamic adjustment allows the system to adapt to rapid changes in Doppler shifts and delays while maintaining efficient channel estimation.
3Measurement precision
If frequency compensation is performed for the entire time period, then phase continuity may be maintained, but compensation accuracy decreases due to large phase shifts within the time period
Solution Approach 1:
The time period is divided into multiple frequency compensation segments, allowing frequency compensation to be performed separately for each segment. This segmentation improves compensation accuracy within each segment by reducing the total phase shift range, while maintaining overall phase continuity through coordinated compensation across segments.
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
Ensures phase continuity during joint channel estimation, enabling accurate uplink channel estimation and improved demodulation performance in NTN systems despite high mobility and large propagation delays.
Implementation Method 1
satellite movement may cause rapid changes in Doppler shifts and delays, resulting in a large phase shift in the time domain window corresponding to the DMRS bundle
Data Source
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AI summary
A method and an apparatus for wireless communication are provided, to solve a problem that a communications system with a large propagation delay and high device mobility such as an NTN, cannot meet a phase continuity requirement due to a phase shift when channel estimation is performed based on a DMRS bundle. The method includes: determining, by a terminal device, a plurality of frequency compensation segments within a first time period based on first information, where the first information is related to a DMRS bundle used for joint channel estimation, and the first time period includes at least one time domain window corresponding to the DMRS bundle; and performing, by the terminal device, pre-compensation on an uplink channel corresponding to the first time period based on the plurality of frequency compensation segments.