Aperiodic CSI Feedback Trigger Mechanism for FD MIMO
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Solution Overview
Problem
In Full Dimension Multiple Input Multiple Output (FD MIMO) systems, the periodic transmission of Channel State Information (CSI) by User Equipment (UE) results in high feedback frequency and significant feedback overhead, degrading spectrum efficiency due to the need for frequent measurement and reporting of CSI-RS in both horizontal and vertical dimensions.
Innovation Solution
A method and device for controlling the feedback of channel state information, where a user equipment receives a trigger signaling from a base station to report CSI within a specified measurement window, allowing for aperiodical transmission and reducing the frequency and overhead of CSI feedback by only reporting measured CSI during this window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic CSI feedback is implemented in FD MIMO systems, then channel state information is continuously updated, but feedback frequency increases and feedback overhead becomes significant
Solution Approach 1:
The patent implements aperiodic CSI feedback by introducing a trigger mechanism where the base station sends a trigger signal to the UE only when CSI feedback is needed, replacing the traditional periodic feedback mode. This converts continuous periodic action into event-driven aperiodic action, reducing unnecessary feedback transmissions while maintaining channel state information accuracy when required.
Solution Approach 2:
The patent changes the feedback timing parameter from fixed periodic intervals to variable aperiodic intervals based on trigger signals. The UE adjusts its feedback behavior according to the received trigger signal, changing from continuous periodic reporting to selective aperiodic reporting, thereby reducing feedback overhead while maintaining reliability.
2Reliability
If periodic CSI measurement and reporting is performed, then channel quality is continuously monitored, but spectrum efficiency deteriorates due to high feedback frequency
Solution Approach 1:
The patent replaces periodic CSI measurement and reporting with aperiodic measurement triggered by base station signals. The UE only performs CSI measurement and reporting when triggered, converting continuous periodic operations into event-driven aperiodic operations, thereby reducing spectrum resource consumption for feedback while maintaining channel quality monitoring capability.
Solution Approach 2:
The system enables the base station to control the feedback process actively by sending trigger signals only when CSI is needed for scheduling decisions. This self-service mechanism allows the base station to request feedback selectively rather than continuously, improving spectrum efficiency by eliminating redundant feedback transmissions.
Data Source
AI summary
Disclosed are a channel status information (CSI) feedback and control method and device. The method comprises: a terminal receives trigger signaling sent by a base station, the trigger signaling being used for instructing the terminal to report CSI obtained within a specified measurement window; and the terminal reports the CSI that is measured by the terminal within the specified measurement window to the base station. Because a terminal reports only CSI that is measured by the terminal within a specified measurement window, the frequency of feeding back CSI by the terminal is reduced, and CSI feedback overheads are also reduced.