CSI Feedback Aligned With PDSCH Transmission Modes
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Solution Overview
Problem
In multi-point coordinated schemes, the reported Channel State Information (CSI) fails to accurately reflect the Physical Downlink Shared Channel (PDSCH) transmission situation due to independent scheduling and measurement by Transmission Reference Points (TRPs).
Innovation Solution
A method and apparatus for feeding back CSI, where a terminal measures and calculates CSI based on the PDSCH transmission mode corresponding to its capability, enabling accurate reflection of PDSCH transmission scenarios by matching the CSI calculation method to the terminal's supported modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent scheduling and measurement by multiple TRPs is used, then scheduling flexibility is improved, but CSI accuracy deteriorates
Solution Approach 1:
The patent introduces an intermediary parameter (joint transmission assumption indicator) that mediates between independent TRP scheduling and accurate CSI reporting. This indicator enables the terminal to select appropriate CSI calculation methods that reflect the actual joint transmission scenario, thereby resolving the contradiction between scheduling flexibility and CSI accuracy.
Solution Approach 2:
The patent makes the CSI calculation method dynamic by allowing the terminal to switch between different calculation approaches based on the joint transmission assumption indicator. This dynamic adaptation enables accurate CSI reporting that reflects the current transmission mode, resolving the contradiction between flexible scheduling and measurement precision.
2Productivity
If multiple PDSCHs with overlapping time-frequency resources are scheduled, then resource utilization is improved, but terminal processing complexity increases
Solution Approach 1:
The patent changes the parameter of CSI calculation methodology based on the terminal's capability and the scheduling scenario. By adjusting the calculation approach (e.g., considering interference from overlapping PDSCHs or not), the system achieves high resource utilization while keeping terminal processing complexity within acceptable bounds.
Solution Approach 2:
The patent segments the CSI calculation process into different scenarios based on PDSCH overlap patterns. For terminals capable of handling complex scenarios, more accurate calculation methods are applied; for simpler cases or capability-limited terminals, simplified methods are used, thereby managing processing complexity while maintaining resource utilization efficiency.
Data Source
AI summary
Disclosed in the present disclosure are a method and apparatus for feeding back channel state information. In the present disclosure, a terminal sends capability information of the terminal to a network device; the terminal measures a downlink reference signal sent by the network device so as to obtain measurement information, and calculates the measurement information on the basis of the Physical Downlink Shared Channel (PDSCH) transmission mode corresponding to the capability information so as to obtain Channel State Information (CSI) for feedback; and the terminal sends the CSI to the network device.