Semi-Persistent CSI-RS Burst Configuration for Accurate CSI Reporting
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently configuring semi-persistent channel state information reference signal (CSI-RS) resources, particularly in 5G/NR mobile communications, which affect beamforming and data transmission efficiency.
Innovation Solution
The system configures semi-persistent CSI-RS resources by defining a CSI-RS burst with multiple time instances and Doppler domain basis vectors, enabling UE and BS to measure and transmit CSI reports, optimizing CSI-RS resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If semi-persistent CSI-RS resources are configured with multiple time instances and Doppler domain basis vectors, then CSI reporting accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the CSI-RS burst into multiple time instances (B>1) and introduces Doppler domain basis vectors to divide the measurement task across different time-frequency domains. This segmentation allows the UE to perform measurements on individual components and combine them, improving accuracy while managing complexity through structured decomposition of the measurement process.
Solution Approach 2:
The patent extends the measurement from traditional frequency domain to include Doppler domain by introducing basis vectors in the Doppler domain. This dimensional extension allows capturing channel characteristics in both frequency and Doppler shifts, improving CSI accuracy for high-mobility scenarios by adding another dimension of analysis without fundamentally changing the existing measurement framework.
2Productivity
If CSI-RS burst with multiple time instances is used, then beamforming efficiency is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary measurements across multiple time instances within the CSI-RS burst before final CSI computation. By collecting measurement data from B>1 time instances in advance and organizing them with Doppler domain basis vectors, the system prepares channel state information that can be quickly processed into beamforming parameters, reducing the critical processing time for beamforming decisions.
Solution Approach 2:
The semi-persistent configuration maintains continuous CSI-RS transmissions across multiple time instances, ensuring uninterrupted channel measurement and tracking. This continuity allows the system to maintain up-to-date CSI information for beamforming without gaps, improving beamforming efficiency while the measurements overlap in time to minimize overall processing duration.
Data Source
AI summary
Apparatuses and methods for configuring semi-persistent CSI-RS resources are provided. A method performed by a user equipment (UE) includes receiving a configuration about a channel state information (CSI) report. The configuration includes information about a CSI reference signal(CSI-RS) burst including B>1 time instances of a CSI-RS transmission. The CSI-RS burst is based on K≥1 CSI-RS resources. The method further includes measuring the CSI-RS burst and identifying a value d, where d is a number of consecutive time instances that are included in a Doppler domain (DD) unit of DD units. The method further includes determining multiple DD basis vectors, where each of the multiple DD basis vectors is associated with N4>1 of the DD units and where N4 is a length of each of the multiple DD basis vectors, and transmitting the CSI report including an indication about the multiple DD basis vectors.