CSI Framework
CSI Framework is one of the most complicated structure and process in NR. I have posted three separate notes with different aspect of this topic. I thought I need to write a page which can consolidate the three separate notes and this page is the one.
Overall procedure for CSI-RS operation can be described as follows and I put the link for the notes which lead you to the details of each step.
NW
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CSI-RS
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Configure/Define CSI Reference signal at physical resource grid.
See CSI-RS page for the details
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NW
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CSI-ResourceSet
CSI-ResourceConfig
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Combine one or more CSI-RS into a higher level structure for a specific purpose. See CSI-Report page for the details.
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NW
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CSI-ReportConfig
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Define/Configure the Report Criteria (Report Period, Quantity, Trigger condition, Codebook Configuration etc). See CSI-Report page for the details of Report Period, Quantiy and overall structure of CSI Framework. See CSI Codebook page for the details of CSI Codebook (Precoding Matrix).
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UE
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Perform Measurement and Report
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UE perform the measurement as instructed by Network and report the result to the network.
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NW
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Adjust PHY/MAC parameters
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Based on the report from UE, NW would adjust PHY/MAC parameters like MCS, Antenna Configuration, CSI Codebook etc.
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