CSI Reference Resource Determination in Duplex Wireless Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reporting Channel State Information (CSI) due to the complexity of determining the reference resource, especially in scenarios with duplex enhancement where downlink and uplink transmissions can occur on the same symbol, affecting the accuracy of CSI measurement and reporting.
Innovation Solution
A method where a User Equipment (UE) configures to report CSI by measuring reference signals in a slot determined based on the transmission direction of the frequency resource, ensuring accurate CSI reporting by identifying valid downlink slots even in duplex-enhanced scenarios, where the reference resource can be a slot with all symbols as flexible or specifically downlink symbols, and adjusting reporting accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CSI measurement is performed in slots with flexible symbols or simultaneous downlink and uplink transmissions, then the adaptability of the system to duplex enhancement is improved, but the measurement precision and reliability of CSI reporting deteriorates
Solution Approach 1:
The patent applies local quality by differentiating between different symbol types within a slot. It identifies that only downlink symbols are suitable for CSI reference signal measurement, while flexible symbols and uplink symbols are excluded. This localized approach ensures that measurements are performed only in appropriate regions (downlink symbols) where the channel characteristics are stable and suitable for accurate CSI estimation, thereby resolving the contradiction between adaptability and measurement precision.
2Adaptability or versatility
If the reference resource includes slots with all symbol types (downlink, flexible, uplink), then the versatility of the reference resource configuration is improved, but the reliability of CSI reporting deteriorates due to interference from simultaneous transmissions
Solution Approach 1:
The patent applies segmentation by dividing the slot into distinct symbol segments and evaluating each segment's suitability for CSI measurement. It segments the reference resource configuration to include only downlink symbols, excluding flexible and uplink symbols that would introduce interference. This segmentation approach maintains configuration flexibility while ensuring reliability by eliminating contaminated measurement segments from the reference resource.
Solution Approach 2:
The patent converts the potential harm of flexible and uplink symbols (which cause interference and measurement errors) into a benefit by using their exclusion as a selection criterion. By identifying which symbols to exclude based on their transmission direction, the system transforms the problem of mixed symbol types into a useful filtering mechanism that automatically selects only the reliable downlink symbols for CSI measurement, thereby improving reporting reliability.
Data Source
AI summary
A method and device for channel state information reference resource. 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 on a symbol in a slot for reporting the CSI. In addition, the slot is determined based on transmission direction of frequency resource to be measured for the CSI.