CSI Feedback Segmentation for Dual Precoder Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting feedback information for DM-RS based open-loop downlink transmission, particularly in accurately reporting Channel Status Information (CSI) to base stations, which affects the performance and efficiency of data transmission.
Innovation Solution
A method and apparatus for reporting CSI by user equipment in a wireless communication system, where CSI is calculated based on Channel Status Information-Reference Signals (CSI-RS) received from the base station, assuming the application of dual precoders, and the information is reported cyclically within a preset resource unit, with precoder and resource unit details provided through Radio Resource Control (RRC) layer signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual precoders are applied for DM-RS based open-loop downlink transmission, then transmission diversity and reliability are improved, but feedback information complexity and reporting overhead increase
Solution Approach 1:
The feedback information is segmented into two separate reports: first feedback information for the first precoder and second feedback information for the second precoder. This segmentation allows the system to handle complex dual precoder feedback by dividing it into manageable parts, reducing the complexity of processing and reporting while maintaining transmission reliability
Solution Approach 2:
The patent implements periodic feedback reporting where user equipment cyclically reports feedback information for different precoders in different time slots. This periodic action distributes the feedback overhead across multiple time instances rather than requiring all feedback at once, making the system more manageable while ensuring both precoders are properly evaluated
2Measurement precision
If CSI feedback for multiple precoders is reported simultaneously, then transmission accuracy is improved, but uplink resource consumption and reporting overhead increase
Solution Approach 1:
The CSI feedback for multiple precoders is segmented into separate feedback messages transmitted at different times. Instead of reporting all CSI measurements simultaneously, the system divides them into first feedback information and second feedback information, reducing peak uplink resource consumption while maintaining overall reporting accuracy
Solution Approach 2:
The system uses periodic reporting where different precoders are evaluated and reported in alternating time slots. This periodic approach allows accurate CSI measurement for each precoder while distributing the uplink resource consumption across multiple time instances, preventing resource overload
3Productivity
If cyclic precoder application is implemented within preset resource units, then feedback reporting efficiency is improved, but system configuration complexity increases
Solution Approach 1:
The system implements cyclic application of precoders within preset resource units, where the same precoder pattern repeats periodically. This periodic structure improves feedback reporting efficiency by allowing user equipment to predict and prepare feedback information in advance, while the regular pattern simplifies the actual implementation despite the initial configuration complexity
Solution Approach 2:
The base station configures the precoder cycling pattern and resource unit structure in advance through higher-layer signaling. This preliminary configuration allows user equipment to understand the expected pattern beforehand, improving feedback efficiency without requiring complex real-time decisions during transmission
Data Source
AI summary
The present invention provides a method for reporting channel status information (CSI) for downlink transmission to an eNode B (eNB) by a user equipment (UE) in a wireless communication system. Specifically, the method comprises the steps of: receiving a channel status information-reference signal (CSI-RS) from the eNB; calculating the CSI on the basis of the CSI-RS under the assumption that a dual-precoder including a first precoder and a second precoder is applied; and reporting the CSI to the eNB, wherein the step of calculating the CSI includes a step for assuming that at least one of the first precoder and the second precoder is cyclically employed from a predetermined precoder candidate set on the basis of a predetermined resource unit; and information associated with the at least one precoder and information associated with the predetermined precoder candidate set are provided from the eNB through radio resource control (RRC) layer signaling.