Aperiodic CSI-RS Triggering for 5G Terminal Processing Load Reduction
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Solution Overview
Problem
The 5G communication system faces challenges in implementing CSI feedback to meet its communication performance requirements, particularly in reducing processing loads on terminal and network devices while ensuring accurate CSI acquisition without relying on blind detection modes.
Innovation Solution
A wireless communication method that allows terminal devices to perform CSI measurements on demand using aperiodic CSI-RS resources, determining time domain resources for CSI feedback based on trigger signaling timing, thereby reducing processing loads and improving communication performance without needing blind detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic real-time CSI measurement is performed, then communication performance is maintained, but processing load increases
Solution Approach 1:
The patent implements aperiodic CSI measurement triggered by downlink data arrival rather than periodic measurement. When downlink data needs to be sent, the network device triggers the terminal to perform CSI measurement on the aperiodic CSI-RS resource, converting continuous periodic action into event-driven periodic action, thus maintaining communication performance while reducing processing load.
Solution Approach 2:
The system uses the arrival of downlink data as a natural trigger event that automatically initiates CSI measurement. The presence of downlink data itself serves as the condition that activates the measurement process, eliminating the need for separate periodic measurement scheduling and reducing overall system complexity.
2Measurement precision
If blind detection mode is used for CSI acquisition, then terminal devices can obtain CSI, but communication performance deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the network device sends downlink data and triggers CSI measurement, the terminal performs measurement on aperiodic CSI-RS resources, and feeds back CSI results to the network device. This closed-loop feedback system ensures accurate CSI acquisition aligned with actual data transmission needs, improving both measurement precision and communication performance compared to blind detection.
Solution Approach 2:
The network device pre-configures aperiodic CSI-RS resources and establishes timing relationships before actual data transmission. When downlink data arrives, the trigger signaling activates the pre-configured measurement resources, ensuring that CSI measurement is performed at the optimal moment with appropriate resources already prepared, thereby improving measurement accuracy.
3Measurement precision
If timing relationship is defined for CSI feedback, then network device can accurately receive CSI, but system complexity increases
Solution Approach 1:
The patent defines specific timing relationship parameters including K1 (time from trigger to CSI feedback), K2 (time from trigger to CSI measurement), and K3 (time from CSI-RS to trigger). By parameterizing these timing relationships, the system achieves precise CSI reception timing control while maintaining flexibility through configurable parameters rather than fixed complex procedures.
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AI summary
A wireless communication method, terminal device and network device, which can meet the communication performance requirements of 5G communication system. The method includes: the terminal device receives a trigger signaling sent by the network device, where the trigger signaling is used to activate an aperiodic channel state information reference signal CSI-RS resource of the terminal device; after receiving the trigger signaling, the terminal device performs the CSI measurement on aperiodic channel state information reference signal CSI-RS resource to obtain a first CSI; the terminal device determines the time domain resource for sending the first CSI the network device based on a timing relationship between sending the first CSI and receiving the trigger signaling or performing the CSI measurement; using the time domain resource, the terminal device sends the first CSI to the network device.