Adaptive CSI Reporting and PRB Bundling for AAS
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Solution Overview
Problem
Current Channel State Information (CSI) reporting and Physical Resource Block (PRB) bundling in wireless communication systems face challenges in optimizing performance for both uplink and downlink transmissions, particularly in highly dispersive channels, where subband CSI reporting improves beamforming but increases uplink overhead, and wideband PRB bundling enhances channel estimation but may not be optimal for beamforming.
Innovation Solution
Adaptive CSI reporting configuration and PRB bundling are implemented based on measurements of channel dispersiveness and uplink power-limited status, dynamically selecting between wideband and subband reporting and bundling to balance uplink and downlink performance, using parameters like long-term and instantaneous channel dispersiveness and allocation bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If subband CSI reporting is used to improve beamforming performance in dispersive channels, then downlink beamforming accuracy is improved, but uplink overhead increases
Solution Approach 1:
The patent implements dynamic adaptation of PRB bundling configuration and CSI reporting mode based on measured channel dispersiveness. The base station measures channel dispersiveness using reference signals, then dynamically selects between wideband and subband PRB bundling configurations, and triggers appropriate CSI reporting modes accordingly. This dynamic adjustment resolves the contradiction by applying subband reporting only when channel conditions warrant the improved beamforming accuracy, rather than universally.
Solution Approach 2:
The patent changes the parameter of PRB bundling configuration (wideband vs. subband) and CSI reporting mode based on the measured channel dispersiveness parameter. When channel dispersiveness exceeds a threshold, the system transitions to subband PRB bundling and subband CSI reporting to improve beamforming. When dispersiveness is low, wideband configurations are used to reduce overhead. This parameter-based adaptation resolves the technical contradiction.
2Measurement precision
If wideband PRB bundling is used to enhance channel estimation, then downlink channel estimation accuracy is improved, but adaptability to dispersive channels deteriorates
Solution Approach 1:
The system dynamically adapts the PRB bundling configuration based on measured channel dispersiveness. The base station measures channel dispersiveness across the bandwidth and dynamically selects between wideband PRB bundling (for low dispersiveness conditions) and subband PRB bundling (for high dispersiveness conditions). This dynamic selection provides both the channel estimation accuracy of wideband bundling when appropriate and the adaptability to dispersive channels when needed.
Solution Approach 2:
The patent changes the PRB bundling configuration parameter based on the channel dispersiveness parameter. When dispersiveness is low, wideband PRB bundling is applied for enhanced channel estimation. When dispersiveness exceeds a threshold, the system switches to subband PRB bundling to maintain adaptability. This parameter-based approach resolves the contradiction between estimation accuracy and adaptability.
3Measurement precision
If subband CSI reporting is configured to optimize beamforming in dispersive channels, then beamforming performance is improved, but uplink power consumption increases
Solution Approach 1:
The patent implements dynamic adaptation of CSI reporting mode based on measured channel dispersiveness and UE power status. When channel dispersiveness is high and the UE is not power-limited, subband CSI reporting is triggered to optimize beamforming. When dispersiveness is low or the UE is power-limited, wideband reporting is used to conserve uplink power. This dynamic approach optimizes beamforming performance only when necessary, reducing unnecessary uplink power consumption.
Solution Approach 2:
The system changes the CSI reporting mode parameter (wideband vs. subband) based on channel dispersiveness and power status parameters. This parameter adaptation ensures that the more power-intensive subband reporting is used only when it provides actual performance benefits, thereby resolving the contradiction between beamforming performance and power consumption.
4Quantity of substance
If static wideband PRB bundling is used to reduce uplink overhead, then uplink overhead is reduced, but downlink performance in dispersive channels deteriorates
Solution Approach 1:
The patent replaces static wideband PRB bundling with dynamic PRB bundling configuration based on measured channel dispersiveness. The base station measures channel dispersiveness and dynamically selects between wideband and subband PRB bundling configurations. This ensures that uplink overhead is minimized when wideband bundling is appropriate, while downlink performance is maintained through subband bundling when channel conditions require it.
Solution Approach 2:
The system changes the PRB bundling configuration parameter based on channel dispersiveness measurements. When dispersiveness is low, wideband PRB bundling is applied to reduce uplink overhead. When dispersiveness exceeds a threshold, the system switches to subband PRB bundling to maintain downlink performance. This parameter-based adaptation resolves the contradiction between overhead reduction and performance reliability.
Data Source
AI summary
Embodiments of a method performed by a base station for adaptive Channel State Information (CSI) reporting configuration and/or Physical Resource Block (PRB) bundling and corresponding embodiments of a base station are disclosed. In some embodiments, a method performed by a base station comprises obtaining one or more parameters comprising one or more measurements of channel dispersiveness of a wireless channel between the base station and a User Equipment (UE), an uplink (UL) power-limited status of the UE, and/or an allocation bandwidth for the UE. The method further comprises selecting, based on the one or more parameters, a CSI report configuration for the UE and/or a PRB bundling configuration for the UE. The method further comprises transmitting, to the UE, information that indicates the selected CSI report configuration and/or information that indicates the selected PRB bundling configuration.