CSI Stream Selection for Accurate Wireless Channel Reporting
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Solution Overview
Problem
Existing wireless communication systems lack efficient methods for performing channel state reports, particularly in configuring the number of data streams for channel state information (CSI) reports.
Innovation Solution
A method and device for reporting CSI in a wireless communication system, involving a user equipment (UE) that receives configuration information and a CSI-reference signal (CSI-RS) to determine the number of information streams, transmitting CSI based on these streams without weighted sum, and including specific stream scope information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of information streams for CSI report is increased to improve reporting accuracy, then the feedback transmission rate is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The patent segments the CSI reporting process into multiple information streams, where the UE determines a specific number of streams to report based on configuration. This segmentation allows the system to divide the complex CSI feedback into manageable streams, improving reporting accuracy through multiple streams while controlling processing complexity by allowing selective configuration of stream numbers.
Solution Approach 2:
The patent introduces dynamic configuration of the number of information streams through higher-layer signaling and DCI-based indications. The UE can adaptively adjust the number of streams based on channel conditions and configuration, enabling the system to optimize between accuracy and complexity dynamically rather than using a fixed approach.
2Measurement precision
If the number of information streams for CSI report is increased to improve reporting accuracy, then the feedback transmission rate is improved, but the uplink feedback overhead increases
Solution Approach 1:
The patent implements partial action by allowing the UE to report only a configured number of information streams rather than all possible streams. Through DCI-based stream indication and selective reporting, the system transmits only the necessary portion of CSI feedback, improving accuracy when needed while reducing overhead through selective transmission of stream information.
Solution Approach 2:
The patent changes the parameter of stream number through dynamic configuration via higher-layer signaling and DCI. By adjusting the number of reported streams as a configurable parameter, the system can adapt feedback overhead to channel conditions and quality requirements, transmitting more streams when accuracy is critical and fewer streams when overhead needs to be minimized.
3Device complexity
If the UE determines the number of information streams autonomously to reduce signaling overhead, then the device complexity is reduced, but the adaptability to different channel conditions decreases
Solution Approach 1:
The patent implements a feedback mechanism where the UE autonomously determines the number of information streams based on channel quality indicators and configuration information. The UE uses feedback about channel conditions to adaptively select the appropriate number of streams, reducing signaling overhead while maintaining adaptability through intelligent decision-making based on observed channel states.
Solution Approach 2:
The patent enables the UE to self-determine the number of information streams to report without requiring explicit network configuration for each stream count. The UE autonomously selects streams based on configuration parameters and channel conditions, reducing signaling complexity while maintaining adaptability through self-service decision-making about which streams to report.
Data Source
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AI summary
The present disclosure provides a method of reporting channel state information (CSI) in a wireless communication system. More specifically, the method performed by a user equipment (UE) includes receiving configuration information related to a CSI report from a base station; receiving a channel state information-reference signal (CSI-RS) from the base station; performing, with the base station, a procedure for determining a number of at least one information stream related to the CSI report, each of the at least one information stream including a CSI parameter; and transmitting the CSI to the base station. The CSI is transmitted based on an information stream as many as the determined number. Based on (i) the CSI being transmitted without performing a weighted sum of the UE for the information stream as many as the determined number and (ii) the information stream as many as the determined number being configured based on (a) at least one first information stream related to CSI generated based on a CSI-RS transmitted prior to the CSI-RS and (b) at least one second information stream related to CSI generated based on the CSI-RS: performing the procedure for determining the number of the at least one information stream related to the CSI report includes determining the number of the at least one information stream related to the CSI report, and transmitting information on the determined number to the base station. The information on the determined number includes information on a specific information stream scope within the at least one second information stream.