CSI Sub-Configuration Reporting for Lower Wireless Feedback Overhead
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently reporting channel state information (CSI) with high overhead and lack effective methods for transmitting CSI corresponding to sub-configurations in a distributed manner.
Innovation Solution
A method for a UE in a wireless communication system involves receiving configuration information for a CSI report with a list of sub-configurations, dividing CSI into multiple sub-reports based on power offset or antenna ports, and transmitting these sub-reports at different occasions, allowing for reduced overhead and efficient CSI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If CSI reporting is performed using conventional methods, then complete channel state information can be reported, but reporting overhead becomes excessive
Solution Approach 1:
The patent divides the complete CSI report into multiple sub-reports, each corresponding to specific sub-configurations of CSI parameters. This segmentation allows the system to report only the necessary subset of CSI information at each occasion, reducing overall reporting overhead while maintaining the ability to convey complete CSI when needed by combining multiple sub-reports.
2Loss of information
If all CSI information is transmitted in a single report, then complete channel state feedback is achieved, but transmission resources are wasted
Solution Approach 1:
The CSI report is segmented into multiple sub-reports based on different sub-configurations (e.g., different CSI-RS resources, antenna ports, or CSI parameters). Each sub-report is transmitted at a specific reporting occasion, allowing the system to use transmission resources efficiently by sending only the required CSI subset at each occasion rather than transmitting all CSI information continuously.
Solution Approach 2:
Different CSI sub-reports are transmitted at different periodic reporting occasions. This periodic action allows the system to optimize resource usage by transmitting CSI information at appropriate intervals based on channel variability and network requirements, rather than continuous transmission.
3Quantity of substance
If CSI sub-configurations are handled separately, then reporting overhead is reduced, but system complexity increases
Solution Approach 1:
The patent employs a universal CSI reporting framework where a single reporting mechanism can handle multiple sub-configurations. The UE is configured with multiple sub-configurations of CSI parameters, and the same reporting structure is used to transmit different sub-reports corresponding to different sub-configurations, reducing the need for separate processing mechanisms for each configuration type.
Solution Approach 2:
The network pre-configures multiple CSI sub-configurations and their corresponding reporting occasions before actual CSI reporting begins. This preliminary configuration allows the UE to efficiently manage multiple sub-configurations without increasing runtime processing complexity, as the mapping between sub-configurations and reporting occasions is established in advance.
Data Source
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AI summary
The purpose of the present disclosure is to report channel state information (CSI) on the basis of sub-configurations in a wireless communication system, and the method performed by a terminal may comprise the steps of: receiving configuration information regarding a CSI report, including a list of a plurality of sub-configurations; and transmitting, to a base station, at least one piece of CSI including a measurement result based on at least one CSI-RS associated with the CSI report.