Half-Duplex CSI Reference Resource Slot Segmentation
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Solution Overview
Problem
In wireless communication systems, particularly in half-duplex mode, existing technologies face challenges in accurately reporting Channel State Information (CSI) due to overlapping downlink and uplink transmissions, which can interfere with CSI measurement and reporting, especially in scenarios where duplexing enhancements are introduced, such as subband non-overlapping full duplex operations.
Innovation Solution
A method where User Equipment (UE) configures to report CSI based on measurements in valid downlink slots where no uplink transmission occurs, determining such slots by identifying symbols or slots not used for UL transmission, ensuring accurate CSI reporting even in enhanced duplexing scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CSI measurement is performed during overlapping downlink and uplink transmissions, then communication throughput is improved, but measurement accuracy deteriorates due to interference
Solution Approach 1:
The patent segments the time-frequency resources by identifying valid downlink slots where no uplink transmission occurs, separating CSI measurement opportunities from uplink transmission periods. This segmentation allows accurate CSI measurement in isolated downlink slots while maintaining overall communication throughput through continued uplink operations in other slots.
Solution Approach 2:
The patent performs preliminary identification of valid downlink slots before CSI measurement and reporting. By pre-determining which slots are suitable for CSI measurement (those without uplink transmission), the system ensures measurement accuracy is established before reporting, while the overall schedule maintains high throughput through proper resource allocation.
2Measurement precision
If half-duplex operation is used to avoid interference, then measurement accuracy is improved, but resource utilization deteriorates
Solution Approach 1:
The patent dynamically identifies valid downlink slots based on actual uplink transmission schedules rather than statically allocating resources. This dynamic approach allows the system to adaptively determine which slots are suitable for CSI measurement, maximizing resource utilization while ensuring measurement accuracy in the selected slots.
Solution Approach 2:
The patent changes the parameter of slot validity by defining valid downlink slots as those where no uplink transmission occurs. This parameter change allows flexible identification of measurement opportunities based on actual transmission patterns, improving both measurement accuracy and resource utilization compared to fixed half-duplex operation.
3Productivity
If full duplex operation is implemented to increase throughput, then resource utilization is improved, but interference increases affecting measurement reliability
Solution Approach 1:
The patent introduces valid downlink slot identification as an intermediary mechanism between full duplex operation and CSI measurement. This intermediary selects specific time slots where downlink transmission occurs without simultaneous uplink transmission, thereby eliminating self-interference while maintaining the overall full duplex resource utilization structure.
Data Source
AI summary
A method and device for channel state information reference resource under half duplex. In one embodiment, a User Equipment (UE) is configured to report Channel State Information (CSI) to a base station. Furthermore, the UE measures reference signal in a valid downlink slot for reporting the CSI wherein the valid downlink slot is a slot where UE does not perform Uplink (UL) transmission on symbols to be measured for the CSI. In addition, the UE reports CSI based on measurement in the valid downlink slot.