CSI Report Derivation Using Partial CSI-RS Measurements
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) may not be able to measure all configured CSI-RSs, leading to outdated CSI reports, which can result in sub-optimal transmission parameter selection by base stations due to dropped CSI reports or the use of outdated channel conditions.
Innovation Solution
The UE is enabled to extrapolate CSI parameters using a subset of configured CSI-RSs within a CSI reference resource interval, allowing for the derivation of CSI reports that represent future channel conditions, thereby improving the selection of transmission parameters by base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE measures all configured CSI-RSs, then the CSI report accuracy is improved, but the measurement time and processing complexity increase
Solution Approach 1:
The patent applies partial action by allowing the UE to derive CSI reports using only a subset of configured CSI-RS resources rather than requiring measurement of all configured resources. When the UE cannot complete measurements on all CSI-RS resources within the available time, it can still generate CSI reports based on the subset of resources that were successfully measured, thereby reducing measurement time while maintaining acceptable CSI accuracy.
2Productivity
If the UE uses a subset of CSI-RSs for CSI derivation, then the processing time is reduced, but the CSI report accuracy deteriorates
Solution Approach 1:
The patent implements preliminary action by configuring multiple CSI-RS resources in advance, where some resources are designated as primary and others as secondary or alternative resources. The UE is pre-configured with the capability to derive CSI from alternative resources if primary resources cannot be measured within the required time frame, thus maintaining productivity while preparing fallback options to preserve accuracy.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting which CSI-RS resources are used for CSI derivation based on timing conditions and measurement availability. The system can switch between different CSI-RS resource configurations and derivation methods depending on whether full or partial measurement is feasible, thereby optimizing the balance between processing speed and accuracy.
3Measurement precision
If the UE waits for all CSI-RS measurements to complete before reporting, then the CSI accuracy is improved, but the CSI report becomes outdated by the time it is transmitted
Solution Approach 1:
The patent applies preliminary action by enabling the UE to initiate CSI report generation as soon as sufficient measurements are available, rather than waiting for all configured CSI-RS measurements to complete. The UE can prepare and transmit CSI reports based on partially completed measurements, ensuring the reports remain current and relevant to channel conditions while maintaining acceptable accuracy levels.
4Measurement precision
If the base station configures more CSI-RS resources, then the CSI measurement accuracy is improved, but the system complexity and resource overhead increase
Solution Approach 1:
The patent applies universality by designing a flexible CSI-RS resource configuration framework where the same set of configured resources can serve multiple purposes: primary measurement resources, alternative measurement resources, and fallback resources. This multi-functional configuration allows the system to maintain high measurement accuracy through multiple resources while avoiding the need for separate resource sets for different measurement scenarios, thereby reducing overall system complexity.
Data Source
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AI summary
A user equipment (UE) may receive a configuration that indicates a set of channel state information reference signals (CSI-RSs) to be measured by the UE for deriving channel state information (CSI), one or more time domain resources for which the UE is to derive the CSI, and a time domain resource for transmission of a CSI report that includes the CSI, wherein the one or more time domain resources for which the UE is to derive the CSI occur after the time domain resource for transmission of the CSI report; determine that the UE cannot measure a first subset of CSI-RSs included in the set of CSI-RSs; derive one or more parameters for the CSI report based at least in part on measuring a second subset of CSI-RSs included in the set of CSI-RSs; and transmit the CSI report in the time domain resource for transmission of the CSI report.