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Federal Register / Vol. 86, No. 7 / Tuesday, January 12, 2021 / Rules and Regulations antenna to a geo-location receiver within a mobile device.
3 The applicant for certification of a mobile device must demonstrate the accuracy of the geo-location method used and the location uncertainty as defined in paragraph b of this section.
For mobile devices that are not using an internal geo-location capability, this uncertainty must account for the accuracy of the geo-location source and the separation distance between such source and the white space device.
4 The antenna height above ground shall be determined by the operator of the device, or by an automatic means.
The mobile device shall provide this information to the white space database when it requests a list of available channels for the geo-fenced area in which it will operate.
5 Each mobile device must access a white space database over the internet to determine the available channels and the maximum permitted power for each available channel within the geo-fenced area in which it will operate. The white space database must take into consideration the mobile devices antenna height above ground level and geo-location uncertainty in determining the list of available channels. It must also take into consideration any variation in mobile device HAAT
throughout the geo-fenced area and must use the highest HAAT within the geo-fenced area in determining channel availability. Operation is permitted only on channels that are indicated by the database as being available at the same power level throughout the entire geofenced area in which the mobile device will operate.
6 Mobile devices must comply with the same separation distances from protected services in 15.712 as fixed devices.
7 Mobile devices may use electrically steerable directional
antennas, but a devices maximum EIRP
in any direction must be used by the white space database in determining channel availability.
8 A mobile device must re-check its coordinates at least once every 60
seconds while in operation except while in sleep mode, i.e., in a mode in which the device is inactive but is not powered down. It must cease operation if its location is within 1.9 kilometers of the boundary, or outside the boundary, of the geo-fenced area over which the white space database has determined the available channels.
9 Each mobile white space device shall access the white space database at least once a day to verify that the operating channels within the geofenced area continue to remain available. Each mobile white space device must adjust its use of channels in accordance with channel availability schedule information provided by its database for the 48-hour period beginning at the time the device last accessed the database for a list of available channels.
10 Operation of mobile white space devices on satellites and aircraft, including unmanned aerial vehicles, is prohibited.
6. Amend 15.712 by:
a. Revising the introductory text and paragraphs a2 and 3 and b3ii and iii;
b. Adding paragraph b3iv;
c. Revising paragraph c2ii;
d. Adding paragraph c2iii; and e. Revising paragraphs d, f, g, h1, and i1.
The revisions and additions read as follows:
15.712 Interference protection requirements.

The separation distances in this section apply to fixed, mobile, and
personal/portable white space devices with a location accuracy of 50 meters.
These distances must be increased by the amount that the location uncertainty of a white space device exceeds 50
meters. Narrowband white space devices shall comply with the separation distances applicable to a fixed white space device operating with 30 dBm conducted power and 36 dBm EIRP across a 6 megahertz channel.
a
2 Required separation distance.
White space devices must be located outside the contours indicated in paragraph a1 of this section of cochannel and adjacent channel stations by at least the minimum distances specified in the tables in paragraph a2v of this section.
i If a device operates between two defined power levels, it must comply with the separation distances for the higher power level.
ii White space devices operating at 40 mW EIRP or less are not required to meet the adjacent channel separation distances.
iii Fixed white space devices operating at 100 mW EIRP or less per 6
megahertz across multiple contiguous TV channels with at least 3-megahertz separation between the frequency band occupied by the white space device and adjacent TV channels are not required to meet the adjacent channel separation distances.
iv Fixed white space devices may only operate above 4 W EIRP in less congested areas as defined in 15.703.
v The following are the tables of minimum required separation distances outside the contours of co-channel and adjacent channel stations that white space devices must meet.

TABLE 2 TO PARAGRAPH a2v Mode II personal/portable white space devices Required separation in kilometers from co-channel digital or analog TV
full service or low power protected contour
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