CSI Omission Procedure for Type II Feedback
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Solution Overview
Problem
The existing 5G NR Rel. 15 Type II CSI feedback system has high overhead and only supports ranks 1 and 2, necessitating overhead reduction and higher rank extension in Rel. 16, which requires revising the CSI omission procedure to fit into allocated PUCCH and PUSCH resources without defined Wideband (WB) and Sub-band (SB) CSI reports.
Innovation Solution
A method for user equipment (UE) that prioritizes and omits linear combination (LC) coefficients based on a predetermined priority rule, determining the omitted coefficients to reduce feedback overhead and extend Type II CSI to ranks 3 and 4, while ensuring efficient resource allocation in PUCCH and PUSCH channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Type II CSI feedback is extended to support higher ranks (rank 3 and 4) in Rel. 16, then the versatility and applicability of the system is improved, but the feedback overhead increases significantly
Solution Approach 1:
The patent extracts and reports only the most critical CSI parameters selectively. Instead of reporting all LC coefficients for higher rank CSI, the system identifies and reports only essential parameters (such as selected LC coefficients and their indices) while omitting redundant information, thereby reducing feedback overhead while maintaining higher rank support capability.
Solution Approach 2:
The patent implements partial reporting of CSI parameters by reporting only a subset of LC coefficients rather than all coefficients. The system determines which coefficients are most important for channel representation and reports only those, using partial action to achieve the balance between higher rank support and overhead reduction.
2Quantity of substance
If frequency domain compression technologies are applied to reduce overhead, then the feedback overhead is reduced, but the measurement precision and accuracy of CSI may be compromised
Solution Approach 1:
The patent applies local quality by selectively compressing different frequency domain components with different precision levels. Instead of uniformly compressing all FD components, the system identifies important frequency regions and maintains higher precision for those regions while applying stronger compression to less critical regions, thereby balancing overhead reduction with accuracy preservation.
Solution Approach 2:
The patent performs preliminary selection of important LC coefficients and frequency components before compression. By pre-identifying which coefficients and frequency regions are most critical for accurate channel representation, the system can apply compression strategies that preserve measurement precision for important parameters while still achieving overall overhead reduction.
3Adaptability or versatility
If existing CSI omission procedure is revised to accommodate Rel. 16 Type II CSI, then the adaptability is improved, but the device complexity and implementation difficulty increase due to undefined WB and SB based CSI reports
Solution Approach 1:
The patent develops a universal CSI omission framework that can handle both Wideband and Sub-band CSI reports within a single procedure. The revised omission mechanism is designed to be multi-functional, accommodating different report types (WB and SB) and different rank configurations through a unified approach, thereby reducing implementation complexity while maintaining adaptability.
Solution Approach 2:
The patent uses parameter changes to adapt the omission procedure to different CSI report configurations. By dynamically adjusting omission parameters (such as which LC coefficients to omit, compression levels, and reporting granularities) based on the specific WB/SB report type and channel conditions, the system achieves adaptability without requiring fundamentally different procedures for each case.
Data Source
AI summary
A user equipment (UE) in communication with a base station (BS) is disclosed that includes a receiver that receives Channel State Information (CSI)-Reference Signals (RSs) from the BS, a processor that generates CSI based on the CSI-RS and performs CSI omission, and a transmitter that transmits, to the BS, CSI reports including the CSI where one or more linear combination (LC) coefficients are omitted based on the CSI omission. Further, in the CSI omission, the processor prioritizes LC coefficients based on a predetermined priority rule and the processor also determines the omitted one or more LC coefficients based on the prioritized LC coefficients. In other aspects, a method for a UE and a wireless communication system are disclosed.