Predictive CSI Reporting for Reduced CSI-RS Beam Operation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently measuring and reporting channel state information (CSI) for beam operation, particularly when the amount of CSI-RS is reduced, which affects beamforming performance and reliability.
Innovation Solution
A method and apparatus for a user equipment (UE) and base station to transmit and receive UE capability information, CSI configuration, and reference signals to predict and report CSI for beam operation, allowing reduced CSI-RS usage while maintaining high beamforming gain and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the amount of CSI-RS is reduced, then overhead and complexity are reduced, but beamforming performance and reliability deteriorate
Solution Approach 1:
The system performs preliminary beam identification using a reduced set of CSI-RS resources before full beamforming operation. The UE reports beam quality information in advance, allowing the base station to pre-select candidate beams and configure appropriate beamforming parameters, thereby maintaining performance while reducing overhead.
Solution Approach 2:
The patent uses CSI interpolation to estimate channel state information for beams that are not directly measured. By copying and extrapolating channel characteristics from measured reference beams to neighboring beams, the system maintains accurate beamforming performance with fewer actual CSI-RS resources required.
2Productivity
If the amount of CSI-RS is reduced, then resource usage is optimized, but measurement precision deteriorates
Solution Approach 1:
The system performs preliminary channel estimation using available CSI-RS resources before data transmission. By pre-measuring channel characteristics and reporting beam quality indicators in advance, the system ensures accurate channel state information is available without requiring excessive CSI-RS overhead during active transmission.
Solution Approach 2:
The patent employs channel interpolation techniques where CSI measurements from a subset of reference beams are used to estimate channel states for other beams. This copying approach allows the system to achieve comprehensive channel knowledge with minimal direct measurements, optimizing resource efficiency while preserving measurement precision.
3Productivity
If beam operation is optimized for high data rates, then transmission performance improves, but system complexity increases
Solution Approach 1:
The beam management process is segmented into distinct phases: initial beam identification using reduced CSI-RS, beam quality reporting by UE, base station beam selection, and subsequent beamforming application. This segmentation allows high data rate beamforming to be applied only after initial setup, reducing overall complexity while maintaining peak performance.
Solution Approach 2:
The system uses channel interpolation to copy channel state information from measured reference beams to derive CSI for data transmission beams. This approach enables high data rate transmission with accurate beamforming without requiring separate extensive measurement procedures for each data beam, thus optimizing the balance between productivity and complexity.
Data Source
AI summary
The present disclosure relates to a 5G or 6G communication systems for supporting a higher data transmission rate. According to various embodiments of the present disclosure, a wireless communication system may comprise a user equipment comprising a transceiving unit and a control unit configured to: transmit, to a base station, UE capability information regarding a predictable beam of the user equipment; receive channel state information (CSI) configuration information from the base station; receive, from the base station, a reference signal transmitted on the basis of a first transmission beam; acquire CSI related to a second transmission beam predicted on the basis of measurement of the reference signal; and transmit, to the base station, the CSI related to the second transmission beam.