Three-Component CSI Reporting with UCI Omission Prioritization
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Solution Overview
Problem
The existing 3GPP Rel.-15 Type-II CSI reporting scheme faces high feedback overhead due to large subband-based combining coefficient reporting, and the UCI omission procedure is not applicable to the three-component CSI reporting scheme, requiring new methods to handle resource allocation limitations without recalculation of CSI matrices.
Innovation Solution
A method for UCI omission in three-component CSI reporting that segments CSI part 2 into multiple subgroups with priority levels, allowing selective omission of amplitude and phase information and bitmaps, ensuring efficient resource utilization without recalculation of combining coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If subband-based combining coefficient reporting is used in Rel.-15 Type-II CSI reporting, then CSI feedback accuracy is improved, but feedback overhead becomes excessively large
Solution Approach 1:
The patent segments the CSI feedback into two parts: CSI part 1 containing critical information (RI, number of non-zero combining coefficients, bitmap indicating positions) and CSI part 2 containing amplitude and phase information. This segmentation allows the network to prioritize and omit less critical parts when resources are constrained, reducing overhead while maintaining essential feedback accuracy.
Solution Approach 2:
The patent extracts and separates the most critical CSI information into CSI part 1, which can be transmitted independently when resources are limited. The less critical amplitude and phase information is placed in CSI part 2, which can be omitted when needed, thereby reducing feedback overhead while preserving essential channel state information for precoding decisions.
2Productivity
If UCI omission procedure is applied to three-component CSI reporting, then resource allocation efficiency is improved, but recalculation of CSI matrices is required
Solution Approach 1:
The patent performs preliminary organization of CSI information into structured parts (CSI part 1 and CSI part 2) with clearly defined contents and priorities before transmission. This preliminary structuring allows the UE to simply omit designated parts when resources are constrained, without needing to recalculate CSI matrices, as the information hierarchy is pre-established.
Solution Approach 2:
The patent changes the parameter of information organization from a flat structure to a hierarchical two-part structure with explicit priority levels. This parameter change enables the UE to apply omission rules by simply reducing the size of CSI part 2 transmissions, avoiding complex recalculation operations while improving resource allocation efficiency.
3Reliability
If complete CSI part 2 is transmitted, then CSI feedback completeness is improved, but payload size increases
Solution Approach 1:
The patent applies partial action by transmitting only the essential CSI information in CSI part 1 when resources are constrained, rather than always transmitting complete CSI part 2. The network can selectively transmit portions of CSI feedback based on available resources, accepting partial information when necessary to reduce payload size while maintaining sufficient feedback for precoding operations.
Data Source
AI summary
A method performed by a UE for providing CSI feedback in the form of CSI reports in a wireless communication system includes receiving, from a gNB, higher layer configurations of one or more downlink reference signals, and CSI report configurations associated with the downlink reference signal configurations, and a radio signal including the downlink reference signals according to the one or more downlink reference signal configurations, the downlink reference signals provided over a configured number of frequency domain resources, time domain resources and one or more ports; determining, for each CSI report, a precoding matrix based on the downlink reference signals and two codebooks, and one or more non-zero combining coefficients for complex combining of one or more spatial domain and delay domain basis vectors; and reporting to the network node the CSI reports for the CSI report configurations.