Aperiodic CSI-RS Threshold Configuration for Beam Measurement Reliability
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Solution Overview
Problem
In mobile communications systems, terminals often struggle to measure specified beams indicated by Downlink Control Information (DCI) for aperiodic Channel State Information-Reference Signals (CSI-RS), leading to communication reliability and validity issues.
Innovation Solution
A method is introduced where a network device obtains terminal capability information, determines a threshold for the aperiodic CSI-RS based on measurement behavior and terminal capabilities, and sends this threshold to the terminal, allowing the terminal to correctly determine the receive beam for normal signal transmission and measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the beam switching timing of the aperiodic CSI-RS reported by the terminal exceeds the maximum value of the triggering offset, then the terminal cannot measure the specified beam indicated by the DCI, but increasing the triggering offset reduces scheduling flexibility
Solution Approach 1:
The patent introduces a new parameter (threshold) related to beam switching timing and changes the parameter settings based on terminal capability information. The network device determines an appropriate threshold value that balances measurement reliability with scheduling flexibility, allowing the system to adapt to different terminal capabilities while maintaining reliable beam measurements.
Solution Approach 2:
The patent performs preliminary determination of the threshold value based on terminal capability information before actual beam switching occurs. By pre-configuring the threshold according to terminal capabilities, the system ensures that beam measurements can be reliably performed while maintaining scheduling flexibility for aperiodic CSI-RS.
2Ease of operation
If the network device configures QCL information using RRC signaling and triggers aperiodic CSI-RS using DCI, then beam indication can be implemented, but terminal measurement fails when beam switching timing exceeds triggering offset
Solution Approach 1:
The patent introduces feedback mechanism where the terminal reports its capability information (including beam switching timing capabilities) to the network device. The network device uses this feedback to determine an appropriate threshold value that ensures reliable beam measurements while maintaining the ease of beam indication through DCI triggering.
Solution Approach 2:
The patent makes the threshold value dynamic by determining it based on terminal capability information. This allows the system to adapt the beam switching threshold to match specific terminal capabilities, ensuring reliable measurements while maintaining operational ease for beam indication.
3Reliability
If the terminal reports capability information including beam switching timing, then the network device can determine appropriate thresholds, but additional signaling overhead is introduced
Solution Approach 1:
The patent enables the terminal to self-report its capability information (including beam switching timing capabilities) to the network device. This self-service approach allows the network device to accurately determine appropriate thresholds without requiring extensive downlink signaling, thereby reducing overall signaling overhead while maintaining determination accuracy.
Data Source
AI summary
The present disclosure discloses a method for configuring an aperiodic channel state information-reference signal, a network device, and a terminal. The method includes: obtaining terminal capability information; determining a threshold of an aperiodic channel state information-reference signal CSI-RS based on measurement behavior of the aperiodic CSI-RS and the terminal capability information; and sending the threshold to a terminal.