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Wireless-Innovation-Forum / 6-GHz-AFC

This repository contains code and data for testing the compliance of Automated Frequency Coordinator (AFC) software. The AFC is defined by the FCC in proceeding 18-295 on Unlicensed Use of the 6 GHz Band. This repository contains procedures, documentation, and tests for such software, and for the devices authorized by it. To contribute, please first read the CONTRIBUTING file in the repository for instructions.
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Clarification regarding clutter loss #54

Closed alexcpn closed 2 months ago

alexcpn commented 5 months ago

I was expanding on the clutter loss calculation part for all conditions and I have some clarification.

In R2-AIP-15 it is described to handle clutter loss thus

Clutter loss shall be calculated and applied taking into consideration each morphology separately at the FS receiver antenna and Standard Power Device locations as given in R2-AIP-12. ii.Clutter loss may be applied at the FS receiver location only if the FS receive antenna height HFS, Rx (AGL) determined as per R2-AIP-14 is lower than 6 meters above ground level.

Regarding the second point, it does not tell about Clutter loss if AP antenna is less than 6 meters, as per the TS 1014 (R2-AGR-05) the minimum height is 1.5 meters

Context is that for Urban and Suburban NLCD codes (ITU-R P.2108-0 (06/2017 https://www.itu.int/dms_pubrec/itu-r/rec/p/R-REC-P.2108-1-202109-I!!PDF-E.pdf) it talks about the clutter loss calculation only working if height is up to 6 meters. Since this is clearly handled for FS receiver, why is this not needed for AP height < 6 meters

It is noted that measurements used in the development of this model used terminal heights up to 6 metres above ground.

R2-AGR-05 Standard Power Device Height Above Ground Level The AFC System shall assume a height above ground level of 1.5 meters for the Standard Power Device height if the corresponding height reported by the device, HSPD (AGL), is less than 1.5 meters.

@AEgbert

AEgbert commented 2 months ago

Per discussions earlier today, the requirements are listed in TS-1014 correctly; the 6 meter requirement is only applied to the FS receiver antenna.

Regarding the statement from P.2108-0 regarding model measurements up to 6 meters, I believe that statement is only present in the subsequent revision P.2108-1, and it is not present in the P.2108-0 revision referenced by TS-1014. Note that P.2108-1 itself does not appear to impose a 6 meter limit, stating that the model can be used at for terminal heights below the clutter height.