Dual-Stage CSI-RS Selection for Wireless Feedback
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in channel state feedback procedures, particularly in selecting the best CSI-RS resources for scheduling, which leads to increased power consumption and workload due to the complexity of calculating spectral efficiencies for multiple resources.
Innovation Solution
A dual-stage CSI selection method is introduced, where a subset of CSI-RS resources is first filtered based on RSRP and SINR thresholds, and then the best resource is selected using an efficiency metric, reducing unnecessary processing and conserving power/cycles by discarding resources that do not meet these thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the quantity of CSI-RS resources is increased to improve scheduling accuracy, then the channel state feedback accuracy is improved, but the power consumption and processing workload increase
Solution Approach 1:
The patent divides the CSI-RS resource selection process into two distinct stages: a first stage that filters resources based on RSRP and SINR thresholds, and a second stage that calculates spectral efficiencies for remaining resources. This segmentation reduces the overall processing burden by eliminating resources that fail to meet basic threshold requirements before performing more complex calculations.
Solution Approach 2:
The patent applies preliminary filtering actions by first evaluating CSI-RS resources against RSRP and SINR thresholds before proceeding to spectral efficiency calculations. This preliminary action eliminates unsuitable resources early in the process, reducing the number of resources that require more intensive processing in subsequent stages.
2Measurement precision
If the quantity of CSI-RS resources is increased to improve scheduling accuracy, then the channel state feedback accuracy is improved, but the processing workload increases
Solution Approach 1:
The patent segments the processing workload into two distinct phases: threshold-based filtering in the first stage and spectral efficiency calculation in the second stage. This segmentation allows the system to handle larger numbers of CSI-RS resources more efficiently by performing simple threshold comparisons before more complex calculations are required.
Solution Approach 2:
The patent performs preliminary filtering using simple RSRP and SINR threshold comparisons before undertaking the more computationally intensive spectral efficiency calculations. This preliminary action reduces the number of resources that require full processing, thereby reducing overall processing workload while maintaining accuracy.
3Reliability
If all CSI-RS resources are processed to ensure accurate selection, then the scheduling performance is improved, but the time required for CSI feedback increases
Solution Approach 1:
The patent segments the resource evaluation process into two stages where the first stage performs quick threshold-based filtering and the second stage performs more time-consuming spectral efficiency calculations only on resources that pass the first stage. This segmentation significantly reduces the total time required for CSI feedback while maintaining scheduling performance.
Solution Approach 2:
The patent applies preliminary threshold filtering as a quick first action that rapidly eliminates unsuitable resources before performing more time-consuming calculations. This preliminary action reduces the number of resources that require full processing time, thereby reducing overall CSI feedback time while preserving scheduling reliability.
Data Source
AI summary
Apparatus, methods, and computer-readable media for facilitating dual stage CSI selection for CSI feedback are disclosed herein. An example method of wireless communication at a UE includes, after detecting a CSI report triggering event, selecting a subset of CSI-RS resources from a set of CSI-RS resources configured for the UE by applying at least one of an RSRP threshold or an SINR threshold to each CSI-RS resource of the set of CSI-RS resources. The example method also includes selecting a CSI-RS resource from the subset of CSI-RS resources based on an efficiency metric associated with each of the CSI-RS resources of the subset of CSI-RS resources. The example method also includes transmitting a CSI report to a base station, the CSI report including a CQI associated with the selected CSI-RS and at least one of a PMI, an RI, or a wideband component of the PMI.