Dual Timing Reference Signals for High-Speed Train Channel Estimation
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Solution Overview
Problem
In high-speed train scenarios, existing wireless communication technologies face challenges in maintaining effective channel estimation due to significant Doppler shifts and interference between multiple transceiver signals, leading to performance degradation and reduced coverage.
Innovation Solution
The method involves configuring user equipment with two timing reference signals and using a downlink scheduling assignment to indicate quasi-co-location information for demodulation reference signals from multiple signal sources, allowing independent channel estimation from each transceiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple transceivers use the same frequency channel to broadcast common communication in a single frequency network, then the coverage area is expanded, but the Doppler shift difference between signals from multiple signal sources becomes pronounced due to high-speed movement
Solution Approach 1:
The patent segments the channel estimation process by introducing multiple separate timing reference signals (first and second timing reference signals) corresponding to different signal sources. Each timing reference signal is used to estimate the channel for its respective signal source independently, allowing the system to handle different Doppler shifts from multiple transceivers without compromising overall channel estimation accuracy in single frequency network scenarios
Solution Approach 2:
The patent changes the parameter of timing reference signal configuration by providing multiple distinct timing reference signals with different Doppler shift characteristics. The network entity configures the user equipment with multiple timing reference signals that match the Doppler shifts of different signal sources, enabling accurate channel estimation for each source while maintaining expanded coverage through single frequency network operation
2Device complexity
If a single timing reference signal is used for channel estimation in single frequency network scenarios, then the system complexity is reduced, but the channel estimation accuracy deteriorates due to significant Doppler shifts from multiple signal sources
Solution Approach 1:
The patent segments the timing reference signal resource into multiple distinct signals (first and second timing reference signals), each associated with a specific signal source. This segmentation allows independent channel estimation for each transceiver, improving accuracy without significantly increasing system complexity because the structure follows the existing multi-transceiver architecture
Solution Approach 2:
The patent creates a universal timing reference signal configuration that can serve multiple signal sources simultaneously. The same timing reference signal structure and processing methodology are applied to multiple sources, providing a scalable solution that maintains consistency across the system while accommodating different Doppler shifts
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
This approach enhances channel estimation accuracy and achieves power gain, improving communication performance and coverage in high-speed train environments.
Implementation Method 1
the anticipated speed at which the user device travels through a geographical region makes it beneficial to effectively create a virtual single transmission area formed using multiple transceivers. However given the relatively high speed of travel and the corresponding movement relative to multiple transceiver in which the user may be moving towards some of the transceivers while also simultaneously moving away from other ones of the transceivers, can result in the same signal being received by the user from the multiple signal sources having a relatively pronounced difference in Doppler shift.
Data Source
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AI summary
A method and apparatus are provided, in which a higher layer configuration is received (2002), where the user equipment is configured with two timing reference signals for receiving a common communication having a same set of data from multiple signal sources. A downlink scheduling assignment including downlink control information is received (2004) in a control channel scheduling a physical downlink shared channel, wherein the downlink scheduling assignment comprises an indication of a transmission configuration indicator indentifying two transmission configuration indicator states, which each indicate quasi-co-location information of a demodulation reference signal corresponding to the physical downlink shared channel relative to a respective one of the first and the second timing reference signals. The physical downlink shared channel is then received (2006) according to the downlink scheduling assignment including the downlink control information.