Reference Signaling Configuration for Aperiodic CSI Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently triggering accurate and timely feedback of channel state information, particularly in scenarios where physical downlink control channels are overloaded, leading to issues such as PDCCH blocking and inefficient link adaptation.
Innovation Solution
The proposed method utilizes downlink grants to trigger aperiodic channel state information feedback, allowing for dynamic and flexible triggering of different types of channel state information feedback based on predefined or semi-statically configured indicators within the downlink control information, including CSI request fields, RNTIs, PUCCH resources, and decoding results, enabling efficient and timely channel state information updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If downlink grants are used to trigger aperiodic channel state information feedback, then feedback timeliness and link adaptation efficiency are improved, but downlink control information overhead and processing complexity increase
Solution Approach 1:
The patent segments the triggering mechanism by introducing distinct trigger types (first type and second type) with different functionalities. The first type triggers feedback based on PDSCH decoding results, while the second type triggers feedback independently of decoding results. This segmentation allows the system to select appropriate triggering methods for different scenarios, reducing overall processing complexity while maintaining feedback timeliness.
Solution Approach 2:
The patent implements dynamic triggering where the terminal device determines whether to send feedback based on real-time conditions. For the first trigger type, feedback is sent only when PDSCH decoding fails (NACK); for the second trigger type, feedback is sent when explicitly triggered regardless of decoding status. This dynamic approach optimizes feedback timing and reduces unnecessary processing overhead.
2Measurement precision
If multiple trigger types for channel state information feedback are implemented, then feedback accuracy and link adaptation performance are improved, but signal processing complexity increases
Solution Approach 1:
The patent applies local quality by assigning different triggering conditions to different trigger types based on specific scenarios. The first trigger type is optimized for cases where decoding feedback is available, while the second trigger type is optimized for cases requiring independent triggering. This localized optimization allows each trigger type to achieve high accuracy in its specific application context without requiring the system to handle all complexity uniformly.
Solution Approach 2:
The patent employs preliminary action by pre-configuring multiple trigger types and their corresponding conditions before actual operation. The terminal device is pre-programmed with the logic to distinguish between first type and second type triggers and to apply the appropriate feedback sending rules. This preliminary configuration reduces real-time processing difficulty while maintaining high feedback accuracy.
3Productivity
If aperiodic channel state information feedback triggering is implemented, then spectral efficiency and resource utilization are improved, but control channel load and blocking probability increase
Solution Approach 1:
The patent implements self-service by enabling the terminal device to autonomously determine when to send feedback based on the received trigger type and local decoding results. For first type triggers, the terminal independently decides to send feedback only when decoding fails; for second type triggers, it sends feedback when explicitly required. This self-service mechanism reduces unnecessary control channel transmissions, lowering PDCCH load and blocking probability while maintaining high spectral efficiency.
Data Source
AI summary
Methods, systems, and devices related to related to digital wireless communication, and more specifically, to techniques related to triggering transmission of feedback channel state information. In one exemplary aspect, a method for wireless communication is disclosed. The method includes receiving, by a terminal, a first message from a wireless communication node. The method also includes performing, by the terminal, a measurement relating to a channel status. The method also includes transmitting, by the terminal, a feedback message to the wireless communication node that includes information relating to the channel status based on determining that the first message includes an indication to feedback the measurement relating to the channel status.