CSI Reporting Offset Configuration for Wireless Channel Measurement
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Solution Overview
Problem
Current mobile communication systems face challenges in efficiently reporting channel state information (CSI) due to time constraints, particularly when the measurement filtering coefficient is greater than 1, leading to insufficient time for User Equipment (UE) to generate CSI measurement results associated with new beam indices, resulting in potential delays or inaccuracies in CSI reporting.
Innovation Solution
A method is introduced that calculates an estimated CSI report value by setting a preset time gap considering the transmission time point of CSI-RS and reporting instance, distinguishing measurement restrictions for terminals, and setting an aperiodic CSI reporting offset, allowing for flexible and non-uniform CSI measurement and reporting based on terminal capability and CSI computation capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measurement filtering coefficient K is set to greater than 1 to improve measurement accuracy, then the CSI measurement precision is improved, but the time required for CSI generation increases causing insufficient time for UE to generate CSI measurement results
Solution Approach 1:
The patent applies preliminary action by pre-configuring the measurement filtering coefficient K and the time gap parameter before CSI measurement occurs. The base station configures these parameters in advance through signaling, allowing the UE to know the expected timing requirements and measurement duration beforehand, thus resolving the time constraint issue while maintaining measurement accuracy.
Solution Approach 2:
The patent changes the parameter K (measurement filtering coefficient) dynamically or semi-dynamically based on channel conditions and UE capability. By adjusting K and the associated time gap parameter, the system optimizes the balance between measurement precision and generation time, ensuring that CSI can be accurately measured within the available time window.
2Measurement precision
If a longer latency is allowed for beam index reporting to ensure accurate CSI measurement, then the measurement precision is improved, but the system responsiveness and speed are reduced
Solution Approach 1:
The patent introduces dynamic adjustment of the time gap parameter between CSI-RS transmission and CSI reporting. The base station can flexibly configure this time gap based on current system conditions, allowing the system to adapt between speed and precision requirements dynamically rather than using a fixed latency.
Solution Approach 2:
The patent applies different measurement and reporting strategies for different UE types and channel conditions. High-precision measurements are performed when needed (e.g., for mobility scenarios), while faster reporting is used for scenarios where speed is critical, thus optimizing the balance locally for different operational contexts.
3Measurement precision
If the UE waits until after reset to report CSI associated with new beam index, then the measurement accuracy is improved, but the reporting time is delayed
Solution Approach 1:
The base station performs preliminary configuration of the time gap parameter and measurement settings before the actual CSI measurement and reporting process. This pre-configuration ensures that the UE knows exactly when to expect the CSI-RS transmission and how long to wait for the report, eliminating unnecessary delays while maintaining measurement accuracy.
Solution Approach 2:
The system implements feedback mechanisms where the base station monitors UE capability and channel conditions, then adjusts the time gap parameter accordingly. This feedback loop ensures that the reporting timing is optimized for each specific scenario, balancing accuracy and speed requirements.
Data Source
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AI summary
The present specification provides a method for measuring and reporting channel state information (CSI) in a wireless communication system and a device for same. More particularly, in a method for reporting channel state information in a wireless communication system, the method which is carried out by means of a base station can comprise the steps of: transmitting CSI report configuration information associated with a CSI report to a terminal, wherein the CSI report configuration information comprises information indicating a time offset for the CSI report; transmitting a channel state information reference signal (CSI-RS) to the terminal; transmitting control information, which is for triggering the CSI report, to the terminal; and receiving from the terminal the CSI report which is generated on the basis of the measurement with respect to the CSI-RS. Here, if the information indicating the time offset for the CSI report is configured in "0" value, the CSI-RS can be transmitted periodically or semi-continuously.