Adaptive CSI Reference Selection for Timely Wireless Reporting
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Solution Overview
Problem
Existing mobile communication systems face challenges in determining a CSI reference resource for accurate CSI reporting, leading to resource wastage and outdated CSI feedback.
Innovation Solution
A method for determining a CSI reference resource by a user equipment (UE) that involves receiving downlink control information, calculating a CSI reference resource based on the number of symbols required for CSI computation, and transmitting the CSI report in a specific slot, ensuring timely and efficient CSI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the CSI reference resource is determined using a fixed time offset from the reporting slot, then the CSI reporting timing is simple and deterministic, but the CSI may become outdated and resources may be wasted when channel conditions change rapidly
Solution Approach 1:
The patent applies dynamics by making the CSI reference resource determination adaptive rather than fixed. The UE dynamically selects the reference resource based on whether the computed time offset falls within valid downlink slots, allowing the system to adapt to varying channel conditions and slot configurations while maintaining accurate CSI reporting.
Solution Approach 2:
The patent changes the parameter of time offset calculation by introducing a validation mechanism. Instead of using a straightforward fixed offset, the system calculates the offset and then validates whether it points to a legitimate downlink slot, adjusting the reference resource selection based on this validation to ensure both accuracy and timeliness.
2Productivity
If the CSI reference resource is set too far from the reporting slot to allow sufficient computation time, then the UE has enough time to compute CSI accurately, but the CSI becomes outdated and communication efficiency decreases
Solution Approach 1:
The patent applies preliminary action by having the UE prepare and compute CSI as soon as the reference resource is identified and validated. The system does not wait for a fixed future time but immediately processes the CSI computation when the reference resource is determined, reducing the time gap between channel measurement and reporting.
Solution Approach 2:
The patent implements feedback through the validation mechanism that checks whether the computed time offset points to a valid downlink slot. This feedback loop ensures that the reference resource selection is both timely and accurate, allowing the system to adjust the reference resource selection based on actual slot availability and channel conditions.
3Reliability
If the UE calculates CSI based on the most recent CSI-RS, then the CSI feedback is up-to-date and resource wastage is prevented, but the timing and resource allocation become more complex
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously determine and validate its own CSI reference resource without requiring complex network coordination. The UE independently calculates the time offset, validates whether it points to a valid downlink slot, and selects the appropriate reference resource, simplifying the overall system complexity while ensuring reliable CSI reporting.
Solution Approach 2:
The patent introduces an intermediary validation mechanism that acts as a mediator between the computed time offset and the final reference resource selection. This validation step checks whether the offset points to a legitimate downlink slot, serving as an intermediary layer that simplifies the determination process while ensuring accuracy and reliability.
Data Source
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AI summary
The present invention provides a method of reporting, by a user equipment (UE), channel state information (CSI) in a wireless communication system, the method comprising: receiving, by the UE and from a base station (BS), downlink control information (DCI) related to an aperiodic CSI report that is to be performed by the UE in a slot n; determining, by the UE, a value nCQI_ref based on a number of symbols Z' related to a time for computing the CSI; determining, by the UE, a CSI reference resource as being a slot n - nCQI_ref.