Type II Port Selection Codebook DFT Base Configuration
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Solution Overview
Problem
Current New Radio (NR) technologies face limitations in enhancing Type II port selection codebooks for higher rank transmissions, particularly in supporting dynamic channel and interference hypotheses for non-coherent joint transmission, and achieving a balance between user equipment complexity, performance, and reporting overhead.
Innovation Solution
The proposed solution involves configuring additional Discrete Fourier Transform (DFT) bases for reporting based on configuration information received via Downlink Control Information (DCI) or higher layer signaling, and utilizing downlink/uplink reciprocity to estimate angles and delays at the gNodeB, with the user equipment reporting remaining channel state information to enhance Type II port selection codebooks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Type II port selection codebook is enhanced for higher rank transmissions, then channel state information accuracy is improved, but reporting overhead increases
Solution Approach 1:
The patent extracts and separates the delay spread information reporting from the full channel state information reporting. By identifying and reporting only the critical delay spread parameters (additional DFT bases) rather than complete CSI, the system achieves improved channel characterization while reducing overall reporting overhead.
Solution Approach 2:
The CSI reporting is segmented into multiple components: basic CSI parameters and additional delay spread information. This segmentation allows the system to report only the necessary additional DFT bases for delay spread characterization, improving measurement precision for specific parameters while managing overall reporting overhead.
2Measurement precision
If additional DFT bases are reported for delay spread characterization, then channel measurement precision is improved, but UE complexity increases
Solution Approach 1:
The patent applies local quality by focusing computational resources on characterizing specific delay spread properties rather than processing entire channel matrices. The UE identifies and reports only the additional DFT bases relevant to delay spread, achieving improved measurement precision for this specific parameter while limiting complexity increase to only the necessary calculations.
3Reliability
If Type II port selection codebook enhancement is implemented, then transmission performance is improved, but signaling overhead increases
Solution Approach 1:
The system performs preliminary identification of additional DFT bases at the UE side before transmission. By pre-processing and identifying the critical delay spread parameters locally, the patent reduces the amount of information that needs to be signaled to the gNB, thereby improving transmission performance while minimizing signaling overhead.
Data Source
AI summary
A wireless communication method for a terminal is disclosed that includes receiving, via Downlink Control Information (DCI) or higher layer signaling, configuration information; and configuring whether to report additional Discrete Fourier Transform (DFT) bases based on the configuration information. In other aspects, a terminal and a system are also disclosed.