Downlink CSI-RS Validity Detection Using PDCCH Time Resources
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In unlicensed spectrum, user equipment (UE) faces challenges in determining the validity of semi-statically configured channel state information-reference signals (CSI-RS) when the base station does not configure DCI format 2-0, leading to uncertainty about CSI-RS validity.
Innovation Solution
The UE determines the validity of downlink reference signals, such as CSI-RS, by monitoring a first type PDCCH, receiving PDSCH, or detecting synchronization signal blocks, and comparing their time-domain resources with the configured CSI-RS resources to establish validity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station does not configure DCI format 2-0 or does not send it, then the UE cannot know COT information, but this increases UE complexity and system overhead for determining CSI-RS validity
Solution Approach 1:
The UE determines CSI-RS validity by autonomously checking whether it is configured to monitor a first type PDCCH or by independently monitoring time-domain resources of PDCCH or synchronization signal blocks, without requiring explicit DCI format 2-0 configuration. This self-service mechanism eliminates the need for additional DCI format 2-0 signaling while enabling reliable CSI-RS validity determination.
Solution Approach 2:
The patent introduces an intermediary mechanism where the UE uses alternative signaling (PDCCH monitoring configuration or synchronization signal block detection) to infer COT information and determine CSI-RS validity, replacing the direct DCI format 2-0 approach. This intermediary path maintains reliability while reducing system overhead and UE complexity.
2Reliability
If the base station configures DCI format 2-0 through dedicated RRC signaling, then the UE can know COT information, but this increases system overhead and configuration complexity
Solution Approach 1:
The patent extracts the COT information determination function from DCI format 2-0 and relocates it to alternative mechanisms: either through the UE's existing PDCCH monitoring configuration or through synchronization signal block detection. This extraction eliminates the need for dedicated DCI format 2-0 signaling, thereby reducing system overhead while maintaining COT information availability.
Solution Approach 2:
The patent makes existing PDCCH monitoring infrastructure and synchronization signal blocks multi-functional by enabling them to serve dual purposes: their original functions plus COT information indication for CSI-RS validity determination. This universality eliminates the need for separate DCI format 2-0 signaling, reducing system overhead while maintaining reliability.
3Measurement precision
If the UE monitors time-domain resources of PDCCH or synchronization signal blocks to determine CSI-RS validity, then accuracy is improved, but this increases processing complexity
Solution Approach 1:
The patent merges the CSI-RS validity determination process with the UE's existing PDCCH monitoring and synchronization signal block detection operations. By combining these functions, the UE achieves accurate CSI-RS validity detection using already-active monitoring mechanisms, avoiding the need for separate complex processing procedures.
Data Source
AI summary
Embodiments of the present disclosure provide a method and apparatus for processing a downlink reference signal, and a readable storage medium, where the method includes: determining whether a downlink reference signal is valid by determining whether a UE is configured to monitor a first type PDCCH, or, by receiving a time-domain resource occupied by a downlink signal or monitoring a time-domain resource occupied by a PDCCH or a synchronization signal block, determining whether the downlink reference signal is valid according to the time-domain resource of the received downlink signal or the monitored PDCCH or the monitored synchronization signal block, and a time-domain resource occupied by the downlink reference signal configured by a high-layer signaling.