Spatial-Domain Channel Reporting Using Antenna Group Correlation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently reporting spatial-domain channel properties, particularly in 5G/NR systems operating in higher frequency bands, due to hardware constraints and limited CSI-RS ports, which affect beamforming and signal transmission quality.
Innovation Solution
The implementation of a UE and base station configuration that measures and reports correlation values between antenna port groups using normalized norm values, enabling improved spatial-domain channel property reporting through CSI-RS resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of CSI-RS ports is increased to improve spatial-domain channel property reporting accuracy, then measurement precision is improved, but hardware complexity and device cost increase
Solution Approach 1:
The patent segments the P CSI-RS ports into two groups (first antenna port group and second antenna port group), each with P/2 ports. This segmentation allows the system to achieve accurate spatial-domain channel property reporting by measuring correlation between groups without requiring a proportional increase in total hardware complexity, as the measurement is performed on divided subsets rather than all ports simultaneously
Solution Approach 2:
The patent performs partial measurement by calculating correlation values between antenna port groups rather than measuring all possible port combinations. The correlation measurement focuses on specific groups (first and second antenna port groups) rather than exhaustive measurement of all P ports, reducing the measurement complexity while maintaining reporting accuracy
2Measurement precision
If normalization by norm values is applied to correlation values, then reporting accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent calculates norm values for each antenna port group in advance before computing the final correlation values. By pre-computing the norm values (Euclidean norms) of the channel responses for each group, the system prepares normalization factors ahead of time, which simplifies the subsequent correlation calculation and improves accuracy without adding significant processing burden during the main measurement phase
Data Source
AI summary
Apparatuses and methods for reporting spatial-domain channel properties. A method performed by a user equipment (UE) includes receiving information about a report associated with a channel state information (CSI) resource setting including a CSI reference-signal (CSI-RS) resource with P CSI-RS ports, a report quantity set to ‘sdcp’, and a reporting band and measuring the CSI-RS resource based on the information. The method further includes determining, based on the information, a correlation value between a first antenna port group and a second antenna port group and transmitting the report including the correlation value. The correlation value is normalized by at least one of norm values of the first antenna port group and second antenna port group over the reporting band. The first antenna port group corresponds to a first subset of the P CSI-RS ports. The second antenna port group corresponds to a second subset of the P CSI-RS ports.