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Federal Register / Vol. 86, No. 7 / Tuesday, January 12, 2021 / Rules and Regulations
distances need to be increased to reflect both the higher power and the higher HAAT proposed and provided a table of recommended separation distances.
33. The Commission will increase the proposed separation distances between PLMRS/CMRS operations and fixed white space devices operating with an HAAT of greater than 250 meters to properly reflect the increase in HAAT of up to 500 meters the Commission is permitting in less congested areas. No party objected to NPSTCs suggested separation distances, and the Commission believes that they will adequately protect PLMRS/CMRS
operations from white space device operations at the higher power and HAAT levels the Commission is permitting. However, the Commission also recognizes Microsofts suggestion that if the separation distances to protect PLMRS/CMRS are increased, they should be provided on a stepped basis, rather than based on the assumption that all white space devices operate at a maximum HAAT of 500

meters, to avoid needlessly making areas off limits to white space devices.
The Commission agrees that this approach will maximize the amount of spectrum available for white space devices while protecting the PLMRS/
CMRS from white space devices operating at higher power and antenna heights. The Commission will therefore specify protection distances for the PLMRS/CMRS for three power level ranges i.e., up to 4 watts EIRP, greater than 4 and up to 10 watts EIRP, and greater than 10 watts and up to 16 watts EIRP, and for two ranges of HAAT i.e., up to 250 meters, and greater than 250
meters and up to 500 meters. The Commission adopts the proposed separation distances for the lower HAAT range, and NPSTCs suggested separation distances for the higher HAAT range.
34. In the T-Band NPRM 85 FR
46047, July 31, 2020, the Commission sought comment on reallocating T-Band spectrum, assigning new licenses by auction for that spectrum in each of the
11 markets areas where the PLMRS/
CMRS currently operates, and relocating public safety eligibles from this band.
The Commission proposed rules that would allow for flexible use in the auctioned T-Band, including wireless use, and also proposed to permit broadcast operations. If the Commission adopts rules to allow new types of licensed services in the T-Band, white space devices would operate on a noninterference basis to them as they do with the current PLMRS/CMRS services in the bands. To the extent that any future services in the T-Band have a different potential for receiving interference than the PLMRS/CMRS, the Commission may need to adjust the minimum separation distances that white space devices must meet.
35. The following two tables show the minimum required separation distances from the 11 metropolitan areas where the PLMRS/CMRS can operate in the TV
bands, and from PLMRS/CMRS
operations authorized under waivers of the rules.

Required separation in kilometers from the areas specified in 90.303a of this chapter White space device transmitter power
Co-channel operation Up to 250 meters HAAT

Up to 4 watts EIRP
Greater than 4 watts and up to 10 watts EIRP
Greater than 10 watts and up to 16 watts EIRP

Adjacent channel operation
Greater than 250
meters HAAT

134.0
136.0
139.2

Up to 250 meters HAAT

158.0
169.8
171.1

Greater than 250
meters HAAT

131.0
131.5
132.2

155.4
166.0
166.2

Required separation in kilometers from operations authorized by waiver outside of the areas specified in 90.303a of this chapter White space device transmitter power
Co-channel operation Up to 250 meters HAAT

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Up to 4 watts EIRP
Greater than 4 watts and up to 10 watts EIRP
Greater than 10 watts and up to 16 watts EIRP

36. LPAS stations, including licensed wireless microphones. The Commission proposed an increase from one kilometer to 1.3 kilometers in the minimum required separation distance between fixed white space devices operating with greater than 10 watts EIRP and registered licensed wireless microphones. Sennheiser and Shure argue that the proposed separation distances to protect licensed wireless microphones should be increased, and they provided a table of recommended distances. Microsoft, however, argues that there is no need to increase the separation distances in the manner Sennheiser and Shure proposes.

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Greater than 250
meters HAAT

54.0
56.0
59.2

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Up to 250 meters HAAT

78.0
89.8
91.1

37. The Commission increases the minimum required separation distance between fixed white space devices operating with a power level greater than 10 watts EIRP and licensed wireless microphones as proposed in the NPRM. This will provide the same level of protection to wireless microphones as the current rules based on a conservative free space propagation model.
38. The Commission declines to require even greater separation distances from wireless microphones as suggested by Sennheiser and Shure. The Commission first notes that no party challenged its 2015 decision to increase the maximum power for fixed white
PO 00000

Adjacent channel operation
51.0
51.5
52.2

Greater than 250
meters HAAT
75.4
86.0
86.2

space devices to 10 watts in less congested areas without also increasing the one-kilometer separation distance from wireless microphones.
The Commission also notes that it did not propose to increase the existing onekilometer separation distance in the NPRM, and it believes that it would be inappropriate in these circumstances to take such an action based on this record.
As a separate and independent basis for its decision, the Commission does not believe that Sennheisers suggested increased separation distances for higher HAAT operations are appropriate. HAAT is defined and calculated along radials at a distance of three to 16 kilometers from a transmitter
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