These are the diagrams in [TS 33.126](https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3181)
The file names used for the diagrams are the figure numbers, e.g. Figure_5.1.vsdx. Inside the visio file, the page name represents the TS version number, e.g. 18.0.0.