Aperiodic Beamforming Reference Signal for Wireless Communication
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Solution Overview
Problem
In high-speed wireless communication scenarios, the rapid changes in channel conditions lead to performance losses due to expired Precoding Matrix Indicators (PMI) fed back by user equipment, causing mismatched precoding strategies.
Innovation Solution
An electronic device and method that selectively adjusts the PMI by triggering a non-periodic beamformed reference signal at the base station based on the communication quality of the user equipment, allowing for more accurate channel state information feedback and precoding codebook determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a larger measurement and report period is used in high speed scenarios, then feedback latency is reduced and system overhead is decreased, but the PMI fed back by user equipment becomes expired and fails to precisely reflect channel states
Solution Approach 1:
The patent implements dynamic adjustment of PMI report periods based on user equipment movement speed. When UE speed exceeds a threshold, the system switches from periodic reporting to event-triggered reporting, where PMI is reported only when channel quality changes significantly. This dynamic mechanism resolves the contradiction by adapting the report frequency to actual channel conditions, reducing unnecessary feedback overhead while maintaining PMI accuracy through event-driven updates.
Solution Approach 2:
The system changes the reporting parameter from fixed periodic intervals to variable event-triggered intervals based on channel quality thresholds. By monitoring channel quality indicators and triggering PMI reports only when changes exceed predefined thresholds, the system optimizes the balance between feedback latency and PMI accuracy, ensuring timely updates without excessive overhead.
2Reliability
If PMI report period is shortened to maintain accuracy in high speed scenarios, then PMI freshness is improved, but performance loss occurs due to quick channel changes and increased overhead
Solution Approach 1:
The patent implements dynamic adjustment of PMI report periods based on user equipment movement speed. When UE speed exceeds a threshold, the system switches from periodic reporting to event-triggered reporting, where PMI is reported only when channel quality changes significantly. This dynamic mechanism resolves the contradiction by adapting the report frequency to actual channel conditions, reducing unnecessary feedback overhead while maintaining PMI accuracy through event-driven updates.
Solution Approach 2:
Instead of continuously reporting PMI at high frequency, the system applies partial action by reporting only when necessary (when channel quality changes exceed thresholds). This selective reporting approach maintains PMI accuracy when needed while avoiding performance degradation from excessive feedback overhead during stable channel conditions.
3Loss of information
If periodic CSI feedback is used, then channel state information is continuously updated, but in high speed scenarios the feedback becomes outdated and causes mismatched precoding strategy
Solution Approach 1:
The patent implements a dual feedback mechanism: periodic CSI feedback for continuous monitoring and event-triggered PMI feedback for critical updates. When channel quality changes exceed predefined thresholds or UE movement is detected, additional PMI reports are triggered immediately. This layered feedback approach ensures channel state information remains fresh and precoding strategies remain matched to actual channel conditions.
Solution Approach 2:
The system performs preliminary monitoring of channel quality indicators and UE movement status to predict when PMI updates will be necessary. By detecting channel quality degradation or rapid movement before significant performance loss occurs, the system can trigger preemptive PMI reports, ensuring channel state information remains current and precoding strategies remain effective.
Data Source
AI summary
An electronic device at a base station end includes a processing circuit, the processing circuit being configured to: configure, in response to request signalling from a user equipment, an aperiodic beam-forming reference signal relevant to a first beam group for the user equipment, wherein the first beam group is determined by a base station according to channel state information periodically fed back by the user equipment; generate downlink control information, so as to indicate that the user equipment feeds back beam selection information according to the aperiodic beam-forming reference signal; determine, according to the beam selection information, one or a plurality of candidate beams and one or a plurality of corresponding second pre-coding codebooks; and determine an effective pre-coding codebook based on the one or multiple second pre-coding codebooks.