Terminal Device Aperiodic CSI Feedback Selection
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Solution Overview
Problem
In New Radio (NR) systems, terminal devices face challenges in selecting and processing Channel State Information (CSI) reports when the number of available CSI processing units is less than the number of CSIs triggered by the network device, leading to a lack of flexibility in CSI feedback.
Innovation Solution
The terminal device receives information from the network device to trigger aperiodic CSI feedback, determines which CSIs to report based on available processing units, and calculates payloads to feed back on the Physical Uplink Shared Channel (PUSCH) resource, allowing for flexible CSI feedback even with limited processing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the network device triggers N aperiodic CSIs to be reported simultaneously, then the CSI feedback comprehensiveness is improved, but the terminal device cannot process all N CSIs when M < N, leading to loss of information
Solution Approach 1:
The terminal device performs partial action by selecting and processing only M out of N triggered CSIs when processing units are insufficient. The selection is based on priority rules (e.g., first M CSIs in the triggered list, or CSIs with highest priority indicators), ensuring that the most important CSI feedback is provided while acknowledging the processing limitation. This resolves the contradiction by accepting partial CSI feedback rather than attempting to process all N CSIs, which would be impossible given M < N processing units.
2Loss of information
If the terminal device processes all N CSIs, then the CSI feedback completeness is improved, but the device complexity increases beyond available processing units
Solution Approach 1:
The terminal device extracts and processes only the essential M CSIs from the set of N triggered CSIs. The extraction is performed based on predefined criteria such as selecting the first M CSIs in the triggering order, or selecting CSIs with the highest priority indicators. This extraction approach reduces the processing complexity from handling all N CSIs to handling only the critical M CSIs, while still providing meaningful CSI feedback to the network device.
3Adaptability or versatility
If the terminal device selects M CSIs from N CSIs, then the adaptability to processing constraints is improved, but the selection mechanism adds operational complexity
Solution Approach 1:
The terminal device performs preliminary action by pre-establishing selection criteria and rules for choosing M CSIs from N triggered CSIs. The selection mechanism is configured in advance through higher-layer signaling (RRC signaling) or follows predetermined rules (e.g., select first M CSIs, or select based on priority indicators). This preliminary configuration simplifies the actual selection operation during runtime, as the terminal device only needs to apply the pre-defined rules rather than making complex real-time decisions about which CSIs to process.
Data Source
AI summary
The embodiments of the present disclosure provide a wireless communication method, a terminal device and a network device. The method includes: receiving first information and second information transmitted by a network device, where the first information is configured to trigger the terminal device to feed back aperiodic N CSIs, and to indicate a PUSCH resource to be used when the CSIs are fed back, and the second information is configured to indicate channel measurement and interference measurement resources corresponding to the N CSIs; determining M CSIs that need to be fed back from the N CSIs according to the first information, the second information and M CSI processing units currently in an idle state; calculating payloads of the M CSIs that need to be fed back, respectively, and feeding back the M CSIs that need to be fed back on the PUSCH resource.