Time-Domain Window Determination for Precise DMRS Bundling in NTN
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Solution Overview
Problem
The precision of determining the nominal and actual time domain windows (TDWs) in non-terrestrial networks (NTN) is low due to excessively large granularity, affecting the accuracy of DMRS bundling and uplink channel coverage.
Innovation Solution
A method to determine the nominal TDW based on the quantity of antenna combinations, group-based nominal time domain window, and correction value of maximum DMRS bundling duration, with actual TDW determined based on the nominal TDW, to enhance DMRS bundling gain and maintain power consistency and phase continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the granularity of UE capability for determining nominal TDW is increased, then the complexity of UE capability reporting is reduced, but the precision of TDW determination deteriorates
Solution Approach 1:
The patent segments the TDW determination into two independent parts: nominal TDW (based on UE capability) and actual TDW (based on scheduling information). This segmentation allows each part to be determined with appropriate precision independently, resolving the contradiction between reporting complexity and determination precision.
Solution Approach 2:
The patent introduces dynamic adjustment of TDW based on scheduling information and antenna combinations. The actual TDW can be dynamically optimized within the nominal TDW framework, allowing precision improvement without increasing UE capability reporting complexity.
2Reliability
If the nominal TDW duration is extended to support DMRS bundling, then the uplink channel coverage is improved, but the phase continuity requirement becomes harder to satisfy
Solution Approach 1:
The patent performs preliminary determination of nominal TDW based on UE capability before actual scheduling. This preliminary action establishes a foundation that ensures phase continuity can be maintained while supporting extended DMRS bundling for improved uplink coverage.
Solution Approach 2:
The patent changes the parameter representation from a single TDW value to a pair of parameters (nominal TDW and actual TDW). This parameter change allows independent optimization of coverage (through nominal TDW) and phase continuity (through actual TDW), resolving the contradiction.
3Measurement precision
If multiple parameters are used to determine nominal TDW, then the precision of TDW determination is improved, but the device complexity increases
Solution Approach 1:
The patent segments the determination process into two stages: nominal TDW determination (using multiple parameters for precision) and actual TDW determination (using scheduling information). This segmentation distributes the processing complexity across different stages, making the overall system manageable while achieving high precision.
Solution Approach 2:
The patent uses multiple parameters for nominal TDW determination (excessive action for precision) but only applies the full complexity when needed. The actual TDW can be determined with simpler methods when nominal TDW suffices, reducing average processing complexity while maintaining precision when required.
Data Source
AI summary
This application provides a time domain window determining method and an apparatus, which are applicable to a non-terrestrial network communication system, and are used to improve precision of determining duration of a nominal time domain window and/or an actual time domain window, to enhance a demodulation reference signal bundling gain. The method includes: determining the duration of the nominal time domain window based on at least one of a quantity of antenna combinations, duration of a group-based nominal time domain window, and a correction value of maximum DMRS bundling duration of a terminal apparatus; and determining the actual time domain window of the terminal apparatus based on the duration of the nominal time domain window.