DMRS Bundling Windowing for NTN Uplink Channel Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In non-terrestrial networks (NTN) with large propagation delay and high device mobility, antenna switching disrupts phase continuity and power consistency during DMRS bundling, affecting uplink channel estimation.
Innovation Solution
Determine a first time domain window for DMRS bundling based on information such as antenna switching intervals, predefined time domain window length, events causing discontinuity, and maximum phase continuity duration to maintain consistency during uplink channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If antenna switching is performed to improve uplink transmission gain, then transmission gain is improved, but phase continuity and power consistency during DMRS bundling are disrupted
Solution Approach 1:
The patent segments the time domain window into multiple sub-windows, where each sub-window corresponds to a specific antenna switching interval. This segmentation allows the system to maintain separate channel estimation processes for different antenna switching phases, thereby preserving phase continuity within each sub-window while still enabling antenna switching across the entire time domain window. The channel estimation is performed independently for each sub-window, ensuring that phase discontinuities caused by antenna switching do not affect the overall estimation accuracy.
Solution Approach 2:
The patent performs preliminary channel estimation for each sub-window before combining the results. By pre-establishing the channel characteristics for each antenna switching interval and storing them as separate channel state information, the system can later combine these pre-computed estimates without suffering from phase discontinuities. This preliminary action allows the system to maintain phase continuity within each sub-window while still benefiting from antenna switching across the full time domain window.
2Power
If antenna switching is performed to improve uplink transmission gain, then transmission gain is improved, but power consistency during DMRS bundling is disrupted
Solution Approach 1:
The patent segments the time domain window into multiple sub-windows based on antenna switching intervals, with each sub-window maintaining independent power consistency. By performing channel estimation separately for each sub-window and combining the results, the system ensures that power variations due to antenna switching do not affect the overall estimation accuracy. Each sub-window's channel estimation is performed with consistent power levels, and the final combined estimate benefits from the diversity of multiple antennas while maintaining power consistency within each segment.
3Ease of manufacture
If a fixed time domain window is used for DMRS bundling, then implementation is simple, but it cannot adapt to varying antenna switching intervals and propagation delays in NTN systems
Solution Approach 1:
The patent introduces dynamic adaptation of the time domain window by dividing it into multiple sub-windows, where each sub-window's duration is specifically tailored to match antenna switching intervals and account for NTN propagation delays. This dynamic structure allows the system to adapt to varying conditions in NTN environments while maintaining a relatively simple implementation framework. The sub-window approach provides flexibility to adjust to different switching intervals and delay characteristics without requiring complete redesign of the DMRS bundling mechanism.
Data Source
AI summary
The present application provides a method and an apparatus for wireless communication. The method includes: determining a first time domain window related to DMRS bundling used for estimation of an uplink channel, where a time length of the first time domain window is determined based on first information.