CSI Report Segmentation for 5G Beam Selection Overhead
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Solution Overview
Problem
The existing channel state information (CSI) transmission methods in new radio (NR) technology face a significant overhead challenge due to the need to report channel properties for multiple beams and frequency locations, which increases as the system bandwidth widens or the number of subbands increases.
Innovation Solution
The proposed solution involves a terminal device performing a channel estimate across a predetermined frequency range for a set of beams with different spatial directions. The device then determines indication information for selected beams and frequency-related information, which are transmitted in separate parts of the CSI report to the network device. This information allows the network device to construct CSI and control transmission effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel properties for both wideband and subband and for different beams are reported in the CSI, then channel state awareness is improved, but transmission overhead increases significantly
Solution Approach 1:
The patent segments the CSI report into two distinct parts: a first part containing beam indication information (CRI, PMI) and a second part containing frequency-related information (CQI, PB). This segmentation allows selective reporting of essential beam information separately from frequency-specific details, reducing overall overhead while maintaining necessary channel state awareness for transmission control.
Solution Approach 2:
The patent extracts and prioritizes the most critical beam indication information (first indication information) from the complete CSI set and places it in the first part of the report. This extraction ensures that essential beam selection data is transmitted efficiently, while less critical frequency-related details are handled in the second part, thereby reducing redundant overhead.
2Measurement precision
If frequency-related information is reported for all frequency locations, then channel state accuracy is improved, but overhead increases
Solution Approach 1:
The patent applies local quality by differentiating the reporting requirements for different parts of the frequency spectrum. The second part of the CSI report contains frequency-related information (CQI, PB) that can be selectively reported for specific frequency locations or subbands rather than all frequency locations uniformly. This allows the system to maintain channel state accuracy where needed while reducing overhead in frequency regions that do not require detailed reporting.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and devices for channel state information (CSI) transmission. In example embodiments, a method implemented in a terminal device includes performing a channel estimate between the terminal device and a network device across a predetermined frequency range for a set of beams having different spatial directions; determining, based on the channel estimate, first indication information indicating at least one beam selected from the set of beams and second indication information indicating frequency-related information for the at least one selected beam at a plurality of frequency locations in the predetermined frequency range; and transmitting to the network device the first indication information in a first part of a channel state information (CSI) report and the second indication information in a second part of the CSI report.