Terminal Device QCL Assumption for CSI Measurement
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Solution Overview
Problem
In channel state information (CSI) measurement, existing technologies face challenges in accurately assuming quasi co-location (QCL) between channel state information-reference signals (CSI-RS) for channel and interference measurements, affecting the receiving performance of terminal devices.
Innovation Solution
A method where a terminal device assumes quasi co-location association between CSI-RS for channel and interference measurements based on spatial receiving parameters, with optional configuration by a network device including Doppler shift, Doppler spread, average delay, and delay spread parameters, allowing the terminal device to perform CSI measurements accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device performs CSI measurement without QCL configuration from the network device, then the receiving performance is improved through autonomous QCL assumption, but the measurement precision may deteriorate due to lack of network-guided parameter configuration
Solution Approach 1:
The terminal device autonomously performs QCL assumption and CSI measurement without requiring network device configuration. The terminal independently determines spatial receiving parameters and other large-scale properties for CSI-RS, enabling self-service operation that improves receiving performance while maintaining measurement capability through autonomous parameter derivation.
2Measurement precision
If the network device configures multiple QCL assumption types (first type spatial parameter and second type Doppler/delay parameters), then the measurement precision is improved, but the device complexity increases due to additional configuration management
Solution Approach 1:
The patent extracts and separates the QCL assumption process into two independent types: first type QCL assumption for spatial receiving parameters and second type QCL assumption for Doppler shift, Doppler spread, average delay, and delay spread parameters. This extraction allows the terminal device to handle each type independently, reducing configuration management complexity while maintaining measurement precision through selective application of appropriate QCL assumptions.
3Ease of operation
If the terminal device uses autonomous QCL assumption for both spatial and Doppler/delay parameters, then the ease of operation is improved by eliminating network configuration requirements, but the reliability may worsen due to potential inaccuracies in autonomous parameter determination
Solution Approach 1:
The patent segments the QCL assumption process into distinct types: first type QCL assumption for spatial receiving parameters and second type QCL assumption for Doppler and delay parameters. This segmentation allows the terminal device to apply autonomous assumption selectively to spatial parameters where it has sufficient capability, while maintaining the option to receive network-configured parameters for Doppler and delay measurements, thus balancing operational simplicity with parameter determination accuracy.
Data Source
AI summary
Embodiments of the present disclosure provide a method for channel state information CSI measurement, a terminal device and a network device. The method includes: a terminal device assumes that a first channel state information-reference signal (CSI-RS) and a second CSI-RS have a quasi co-location QCL association with respect to a spatial receiving parameter, where the first CSI-RS and the second CSI-RS are respectively a reference signal for channel measurement and a reference signal for interference measurement in a CSI measurement; and the terminal device performs the CSI measurement according to QCL information between the first CSI-RS and the second CSI-RS. The method, terminal device and network device according to the embodiments of the present disclosure are advantageous for improving receiving performance of a UE.