CSI-RS Measurement Restriction for Non-Codebook Uplink Precoding
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Solution Overview
Problem
Current methods for measuring channel state information reference signals (CSI-RS) in non-codebook based uplink transmissions face challenges in accurately determining precoding information due to unclear CSI-RS measurement restrictions, leading to inefficient beam adjustment and measurement processes.
Innovation Solution
A method and apparatus that involve transmitting and receiving CSI-RS measurement restrictions to determine precoding information for sounding reference signal (SRS) resources, allowing base stations to adjust beams and user equipment (UE) to measure CSI-RS properly, with specific instances of CSI-RS measurement specified based on timing and configuration parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI-RS measurement restrictions are not clearly defined, then beam adjustment and measurement processes can proceed without specific timing constraints, but measurement precision and precoding information accuracy deteriorate
Solution Approach 1:
The patent applies parameter changes by defining specific timing parameters (offset values, time windows) for CSI-RS measurement restrictions. These parameters control when measurements occur relative to SRS transmissions, transforming an undefined measurement process into a precisely timed operation that improves measurement accuracy while maintaining manageable system complexity through standardized parameter sets.
2Reliability
If multiple CSI-RS resources are measured without restriction, then measurement coverage is improved, but determination of appropriate precoding information becomes difficult and inefficient
Solution Approach 1:
The patent extracts and isolates specific CSI-RS resources that are relevant to particular SRS transmissions by applying measurement restrictions. Instead of requiring measurement of all available CSI-RS resources, the restriction mechanism extracts only the necessary subset, improving reliability of precoding determination while reducing the quantity of measurements required.
3Productivity
If beam adjustment is performed without specific CSI-RS measurement timing, then operational flexibility is maintained, but beam adjustment accuracy and uplink transmission efficiency deteriorate
Solution Approach 1:
The patent applies preliminary action by performing CSI-RS measurements at specifically timed intervals before SRS transmissions. The measurement restriction configuration establishes predetermined time windows and offset values that ensure measurements are completed in advance of beam adjustment operations, improving uplink transmission efficiency through accurate precoding while maintaining operational flexibility through configurable timing parameters.
Data Source
AI summary
A method performed by a base station for measuring a channel state information reference signal (CSI-RS) for non-codebook based uplink (UL) transmission. The method includes transmitting information relating to a sounding reference signal (SRS) resource set for the non-codebook based UL transmission, information relating to a CSI-RS resource, a CSI-RS over the CSI-RS resource, and information relating to CSI-RS measurement restriction for measurement of the CSI-RS according to the CSI-RS measurement restriction. The measurement is for determining precoding information for the SRS resource set. The method includes receiving the SRS resource set, measuring the SRS resource set, and determining one or more SRS resources within the SRS resource set to be used for precoding the UL transmission. The method further includes transmitting a downlink control information (DCI) that indicates the SRS resources within the SRS resource set to be used for precoding the UL transmission, and receiving the UL transmission.