Channel State Information Reporting for Multiple Bandwidth Parts
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in channel state reporting, particularly when multiple bandwidth parts are configured, leading to increased overhead and reduced accuracy due to redundant information reporting.
Innovation Solution
A method where user equipment constructs and reports channel state information by distinguishing between first channel state information common to all bandwidth parts and second channel state information specific to each part, using enhanced wideband values and differential values, and adjusts reporting based on payload size to minimize overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel state information is reported for each bandwidth part separately, then the accuracy of channel information is improved, but the reporting overhead increases
Solution Approach 1:
The patent segments channel state information into two distinct parts: first CSI containing eWB parameters common to all bandwidth parts, and second CSI containing bandwidth-part-specific parameters. This segmentation allows the system to report detailed information for each bandwidth part while sharing common parameters once, thereby maintaining measurement precision while reducing redundant reporting overhead.
Solution Approach 2:
The patent merges common channel state information elements (eWB) across multiple bandwidth parts into a single first CSI report. By combining these shared parameters at a higher level, the system avoids repeating the same information for each bandwidth part, thus reducing overall reporting overhead while preserving the ability to provide accurate per-bandwidth-part information through the second CSI.
2Loss of information
If all channel state information elements are reported for each bandwidth part, then the completeness of information is improved, but the payload size increases
Solution Approach 1:
The patent divides the complete channel state information into two segments: first CSI with common elements applicable to all bandwidth parts, and second CSI with bandwidth-part-specific elements. This segmentation ensures that all necessary information is reported without duplicating common elements across multiple bandwidth parts, thereby maintaining information completeness while controlling payload size.
Solution Approach 2:
The patent extracts common channel state information elements (eWB) from individual bandwidth part reports and places them in a separate first CSI structure. By taking out these redundant common elements from each bandwidth part's information set, the system maintains complete information availability while significantly reducing the total payload size that would result from reporting all elements for each bandwidth part separately.
3Quantity of substance
If channel state information is compressed to reduce payload size, then the overhead is reduced, but the accuracy of channel information decreases
Solution Approach 1:
The patent applies local quality by providing different levels of information detail for different bandwidth parts based on their specific characteristics. Bandwidth parts with similar channel conditions share common eWB parameters in first CSI, while bandwidth parts with distinct characteristics report their specific variations in second CSI. This approach reduces overall payload size through compression while maintaining accuracy where it matters most by preserving local variations.
Solution Approach 2:
The patent changes the representation parameters of channel state information by introducing differential encoding for the second CSI. Instead of reporting absolute values for all parameters in each bandwidth part, the system reports differences from the common eWB values. This parameter transformation reduces payload size while preserving the ability to reconstruct accurate channel information through the relationship between first and second CSI.
Data Source
AI summary
A method for a user equipment (UE) to report channel state information in a wireless communication system is disclosed. The method comprises if a plurality of bandwidth parts (BWPs) is configured for a reporting of the channel state information, constructing the channel state information based on at least one representative channel state information element per each bandwidth part, and reporting the channel state information to a base station, wherein the channel state information includes first channel state information including enhanced wideband per BWP (eWB) commonly related to channel state information of the plurality of bandwidth parts, and second channel state information related to channel state information of each bandwidth part included in the plurality of bandwidth parts.