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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Access Point Clutter Loss Related clarification for AFCS,SIP.1 #62
For the AFCS.SIP.1 test vector, the AP is in Puerto Rico .
All uncertainty points are however in the suburban areas (NLCD code=23 ap_clutter=28.358255979867597) from the Map. Though I am not fully sure if the OSM map is correct here
I get NLCD code =23 ap_clutter=28.358255979867597 and PSD does not match the test vector. Using this I get PSD=26.28 which is not correct as per the expected frequency
However when I downloaded the Tiles from the US Govt https://www.mrlc.gov/viewer/ for 2021 land cover (NLCD_GlcJyR14qcsvJMtF4FFW.zip) and loaded this in QGIS and checked via value tool and also visually it seems to confirm with the OSM map that it is a suburban area NLCD code 22/23 for all uncertainty points
I added both the layers from MRLC 2021 Land cover and the one from Wi-FiTestSuite (VI_PR-NLCD_Data/nlcd_n19w067_ref.int on the QGIS and I can see difference between the two in certain uncertainty positions
Just wanted to clarify which is the correct tiles to use.
With the Wi-FiTestSuite data I am getting closer to the target
If I put AP clutter loss as 0, then I am getting exactly to the target. But as per the spec, the clutter loss is zero at the receiver side if the receiver antenna height > 6 m and R2-AIP-25 talks nothing about the Access Point antenna height limit for clutter loss
For the AFCS.SIP.1 test vector, the AP is in Puerto Rico . All uncertainty points are however in the suburban areas (NLCD code=23 ap_clutter=28.358255979867597) from the Map. Though I am not fully sure if the OSM map is correct here
If I use the NLCD tiles from WINNF https://github.com/Wireless-Innovation-Forum/Common-Data/blob/694c98ff82b05c5404a8d67698074233456bfae1/data/nlcd/nlcd_islands/nlcd_n19w067_ref.zip
I get
NLCD code =23 ap_clutter=28.358255979867597
and PSD does not match the test vector. Using this I get PSD=26.28 which is not correct as per the expected frequencyIf I use the NLCD tiles from https://github.com/Wi-FiTestSuite/6GHz-AFC/tree/main/NLCD_data - NLCD data for Puerto Rico and Virgin Islands, I get
NLCD code=43 ap_clutter=7.03211975868273
and the PSD which matches the test dataHowever when I downloaded the Tiles from the US Govt https://www.mrlc.gov/viewer/ for 2021 land cover (NLCD_GlcJyR14qcsvJMtF4FFW.zip) and loaded this in QGIS and checked via value tool and also visually it seems to confirm with the OSM map that it is a suburban area NLCD code 22/23 for all uncertainty points![image](https://github.com/Wireless-Innovation-Forum/6-GHz-AFC/assets/1157251/c325ee26-4ac2-437d-aeed-0c47e11cef9d)
I added both the layers from MRLC 2021 Land cover and the one from Wi-FiTestSuite (VI_PR-NLCD_Data/nlcd_n19w067_ref.int on the QGIS and I can see difference between the two in certain uncertainty positions![image](https://github.com/Wireless-Innovation-Forum/6-GHz-AFC/assets/1157251/1566b2de-1aa1-4c11-816c-bc5cf14cf2bc)
Just wanted to clarify which is the correct tiles to use.
With the Wi-FiTestSuite data I am getting closer to the target
If I put AP clutter loss as 0, then I am getting exactly to the target. But as per the spec, the clutter loss is zero at the receiver side if the receiver antenna height > 6 m and R2-AIP-25 talks nothing about the Access Point antenna height limit for clutter loss