UE-Specific Reference Signal Design for 5G Control Channel Beamforming
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Solution Overview
Problem
The 5G system lacks efficient precoding and beamforming capabilities for downlink control channels, which affects channel estimation and system performance due to the shared common reference signal across the entire system bandwidth.
Innovation Solution
The solution involves designing a UE-specific downlink control channel with a time-frequency resource for the reference signal, using multiple consecutive resource elements in the frequency domain, and applying beamforming to enhance channel estimation, while reducing interference between adjacent beams by shifting the reference signal locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a common reference signal is used for downlink control channel demodulation, then channel estimation quality is guaranteed across the whole system bandwidth, but precoding or beamforming cannot be applied to specific terminal devices
Solution Approach 1:
The patent segments the reference signal from a common system-wide signal into UE-specific reference signals. Each terminal device is assigned its own reference signal resources, allowing the reference signal to be tailored for specific devices while maintaining good channel estimation properties. This segmentation enables both accurate channel estimation and device-specific precoding/beamforming.
Solution Approach 2:
The patent applies local quality by making reference signals UE-specific rather than common for all devices. Each terminal device receives a reference signal optimized for its specific channel conditions and beamforming requirements. This local customization allows precoding and beamforming to be applied effectively to individual devices while maintaining high channel estimation accuracy.
2Area of stationary object
If reference signals are transmitted across the whole system bandwidth, then channel estimation coverage is maximized, but interference between adjacent beams cannot be reduced
Solution Approach 1:
The patent segments the system bandwidth into UE-specific reference signal resources rather than using a common reference signal across the entire bandwidth. Each terminal device is assigned specific frequency resources for its reference signal, which reduces interference between adjacent beams while maintaining adequate channel estimation coverage through the use of multiple resource elements.
Solution Approach 2:
The patent uses multiple consecutive resource elements in the frequency domain to provide sufficient channel estimation coverage. By extending the reference signal across multiple frequency resources rather than using a single wideband signal, the patent achieves both reduced interference and adequate coverage through a different dimensional approach.
3Measurement precision
If multiple consecutive resource elements are used for UE-specific reference signal, then channel estimation accuracy is improved, but resource overhead increases
Solution Approach 1:
The patent uses multiple consecutive resource elements for the reference signal, which provides more than the minimum single resource element would provide. This excessive use of frequency resources improves channel estimation accuracy by providing more measurement points, while the overhead is managed through efficient resource allocation to specific UEs rather than system-wide transmission.
Data Source
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AI summary
The present application discloses a method for transmitting a signal, a network device and a terminal device. The method includes: determining a time-frequency resource for a reference signal required by a control channel, where the time-frequency resource for the reference signal includes multiple sets of resource groups, and the resource group includes two resource elements (RE) that are consecutive in a frequency domain; transmitting the reference signal via the time-frequency resource for the reference signal. The method for transmitting a signal, the network device and the terminal device according to embodiments of the present application can improve the performance of the system.