Reference Signal Segmentation for Delay Estimation in HST-SFN
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Solution Overview
Problem
In High Speed Train (HST) Single Frequency Network (SFN) deployment scenarios, accurate channel estimation is challenging due to high Doppler shifts and delay differences experienced by User Equipment (UE), leading to performance degradation.
Innovation Solution
The method involves transmitting first and second Reference Signals (RSs) to terminals, where the first RS is associated with Doppler shift, Doppler spread, average delay, and delay spread, and the second RS is associated with average delay or delay spread, enabling accurate estimation of delay-related parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TRPs transmit downlink signals in HST-SFN scenario, then coverage and reliability are improved, but delay estimation accuracy deteriorates due to high Doppler shifts and delay differences
Solution Approach 1:
The patent segments the reference signal transmission by introducing a second reference signal specifically dedicated to delay estimation, separate from the first reference signal used for other purposes. This segmentation allows the delay estimation function to be optimized independently, resolving the contradiction by providing a specialized signal for accurate delay measurement even in high Doppler environments with multiple TRPs
Solution Approach 2:
The patent applies local quality by configuring the second reference signal with specific properties optimized for delay estimation (such as appropriate time spacing and frequency positioning). This localized optimization of signal characteristics at the reference signal level enables accurate delay estimation without compromising the overall system reliability provided by multiple TRPs
2Ease of operation
If Doppler pre-compensation is applied in HST-SFN scenario, then user experience is improved, but accurate delay parameter estimation becomes more difficult due to high mobility
Solution Approach 1:
The patent applies preliminary action by performing Doppler pre-compensation on the reference signals before transmission to the terminal. This pre-processing of the signals compensates for the expected Doppler shift due to high mobility, thereby improving user experience while maintaining the ability to accurately estimate delay parameters through the specially configured second reference signal
Data Source
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AI summary
The present application discloses an information transmission method and apparatus, a network device, a terminal, and a storage medium. The method includes that: the network device transmits first information to a terminal, the first information indicating a first Reference Signal (RS) and a second RS, the first RS being associated with a Doppler shift, Doppler spread, average delay and delay spread, and the second RS being associated with one of the following: average delay; delay spread; and average delay and delay spread.