SRS Frequency Adjustment via TRS Doppler Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-speed railways cause significant Doppler frequency offsets due to relative speeds between users and base stations, leading to inaccurate Doppler frequency estimation by terminals, which affects communication system performance.
Innovation Solution
A signal processing method and device that transmit information related to tracking reference signals (TRS) or channel state information-reference signals (CSI-RS) to terminals, enabling them to adjust the transmission frequency of sounding reference signals (SRS) based on estimated frequency information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal estimates Doppler frequency based on TRS from multiple RRHs transmitting in different directions, then the terminal can perform frequency estimation, but the estimation accuracy deteriorates because the TRS appears as multiple multipaths with completely different or even opposite Dopplers
Solution Approach 1:
The patent segments the frequency estimation process by RRH or antenna panel. Instead of performing a single unified frequency estimation across all TRS signals, the terminal performs separate frequency estimations for each RRH or antenna panel based on their respective TRS signals. This segmentation allows each estimation to be tailored to the specific Doppler characteristics of that particular signal source, thereby resolving the contradiction between maintaining estimation accuracy and handling multiple signals with different Doppler frequencies.
2Area of stationary object
If multiple RRHs transmit signals in different directions, then the coverage area is improved, but the Doppler frequency estimation becomes inaccurate because each channel has completely different or even opposite Doppler frequencies
Solution Approach 1:
The patent applies local quality by associating each TRS signal with specific spatial information (RRH identity, antenna panel identity, or beam identity) and performing frequency estimation separately for each local signal source. This means that each TRS signal is processed with quality and parameters appropriate to its specific transmission characteristics, rather than applying a uniform estimation approach to all signals. This resolves the contradiction by allowing different parts of the signal environment to be handled with locally optimized estimation methods.
Data Source
AI summary
A signal processing method includes: sending first information to a terminal, the first information including: relation information of a TRS or a CSI-RS with an SRS, and the first information being used to indicate that the terminal adjust a sending frequency of the SRS according to a TRS or CSI-RS estimated frequency.