User Equipment Precoding Feedback for Wireless Overhead Reduction
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Solution Overview
Problem
In wireless communication systems, especially with New Radio (NR) technology, the increase in antenna elements complicates beamforming, leading to higher overhead in Channel State Information (CSI) estimation and feedback, which increases the load on user equipment and base stations, and requires efficient methods to reduce power consumption and processing loads.
Innovation Solution
The proposed solution involves a user equipment (UE) that transmits only precoding-related information or Channel Quality Indicator (CQI) to the base station, without the need for full CSI feedback, allowing for reduced overhead and load on the UE and base station, and supports periodic or aperiodic CSI feedback schemes to adapt to different duplex modes and frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full CSI feedback is transmitted from UE to BS, then beamforming accuracy is improved, but overhead and processing load increase
Solution Approach 1:
The patent extracts and transmits only the essential precoding-related information (PMI, CRI, RI) from the complete CSI feedback set, separating the critical beamforming parameters from other CSI elements. This extraction approach maintains beamforming accuracy while significantly reducing feedback overhead and processing requirements at both UE and BS.
2Manufacturing precision
If multiple antenna elements are used for beamforming, then beam sharpness is improved, but the number of beam candidates and overhead increase
Solution Approach 1:
The patent segments the large set of beam candidates into manageable groups or subsets, allowing the UE to evaluate and report on a reduced number of representative beam candidates. This segmentation maintains the ability to achieve sharp beamforming through multiple antenna elements while reducing the computational burden and overhead associated with evaluating all possible beam candidates.
3Reliability
If comprehensive CSI estimation is performed, then link adaptation is improved, but power consumption and processing load increase
Solution Approach 1:
The patent applies partial action by performing CSI estimation only for the essential parameters needed for precoding (PMI, CRI, RI) rather than comprehensive CSI estimation. This partial estimation approach maintains sufficient link adaptation capability while significantly reducing the processing load and power consumption at the UE, as the UE does not need to calculate and report all CSI components.
Data Source
AI summary
A user equipment (UE) includes a receiver that receives a Reference Signal (RS) from a base station (BS), and a transmitter that transmits, to the BS, only precoding-related information used for precoding in the BS in response to the RS. The precoding-related information is at least one of a RS Resource Indicator (RRI) that identifies a radio resource used for RS BS transmission, a Precoding Matrix Indicator (PMI), a Rank indicator (RI), and a Reference Signal Received Power (RSRP). The transmitter only periodically transmits the only precoding-related information. The receiver receives a signal precoded using the precoding-related information by the BS.