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Federal Register / Vol. 86, No. 7 / Tuesday, January 12, 2021 / Rules and Regulations
operating powers from the white space database.
ii Narrowband white space devices shall operate on channel sizes that are no more than 100 kilohertz. The edge of a narrowband channel shall be offset from the upper and lower edge of the 6
megahertz channel in which it operates by at least 250 kilohertz, except in the case where bonded 6 megahertz channels share a common band edge.
Narrowband operating channels shall be at integral multiples of 100 kilohertz beginning at a 250 kilohertz offset from a 6 megahertz channels edge, or with no offset at the common band edge of two bonded 6 megahertz channels.
iii The conducted power limit is 12.6 dBm in a 100 kilohertz segment.
The EIRP limit is 18.6 dBm in a 100
kilohertz segment. The conducted power spectral density limit is 12.6 dBm in any 100 kilohertz band during any time interval of continuous transmission.
iv Conducted adjacent channel emissions shall be limited to 42.8
dBm in 100 kilohertz in a first adjacent 6 megahertz channel, starting at the edge of the 6 megahertz channel within which the narrowband device is operating. This limit shall not apply between the edge of the narrowband channel and the edge of the 6 megahertz channel that contains it.
v If transmitting antennas of directional gain greater than 6 dBi are used, the maximum conducted power output shall be reduced by the amount in dB that the directional gain of the antenna exceeds 6 dBi.
vi Total occupancy for each narrowband channel shall be limited to 36 seconds per hour.
c
2 The conducted power, PSD, and adjacent channel limits for fixed and mobile white space devices operating at greater than 36 dBm 4,000 milliwatts EIRP shown in the table in paragraph b1iii of this section are based on a maximum transmitting antenna gain of 12 dBi. If transmitting antennas of directional gain greater than 12 dBi are used, the maximum conducted output power shall be reduced by the amount in dB that the directional gain of the antenna exceeds 12 dBi.

g
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i Above ground level. The transmit antenna height shall not exceed 10
meters above ground level in any area for fixed white space devices operating in the TV bands at 40 mW EIRP or less or operating across multiple contiguous TV channels at 100 mW EIRP or less.

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ii Height above average terrain HAAT. For devices operating in the TV
bands below 602 MHz, the transmit antenna shall not be located where its height above average terrain exceeds 250 meters generally, or 500 meters in less congested areas. For devices operating in all other bands the transmit antenna shall not be located where its height above average terrain exceeds 250 meters. The HAAT is to be calculated by the white space database using the methodology in 73.684d of this chapter. For HAAT greater than 250
meters the following procedures are required:
A The installing party must contact a white space database and identify all TV broadcast station contours that would be potentially affected by operation at the planned HAAT and EIRP. A potentially affected TV station is one where the protected service contour is within the applicable separation distance for the white space device operating at an assumed HAAT
of 50 meters above the planned height at the proposed power level.
B The installing party must notify each of these licensees and provide the geographic coordinates of the white space device, relevant technical parameters of the proposed deployment, and contact information.
C No earlier than four calendar days after the notification in paragraph g1iiB of this section, the installing party may commence operations.
D Upon request, the installing party must provide each potentially affected licensee with information on the time periods of operations.
E If the installing party seeks to modify its operations by increasing its power level, by moving more than 100
meters horizontally from its location, or by making an increase in the HAAT or EIRP of the white space device that results in an increase in the minimum required separation distances from cochannel or adjacent channel TV station contours, it must conduct a new notification.
F All notifications required by this section must be in written form including email. In all cases, the names of persons contacted, and dates of contact should be kept by the white space device operator for its records and supplied to the Commission upon request.

5. Amend 15.711 by revising paragraphs j3 and 4 and adding paragraph k to read as follows:
15.711

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Interference avoidance methods.

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3 A white space database shall be protected from unauthorized data input or alteration of stored data. To provide this protection, the white space database administrator shall establish communications authentication procedures that allow fixed, mobile, and Mode II white space devices to be assured that the data they receive is from an authorized source.
4 Applications for certification of white space devices shall include a high level operational description of the technologies and measures that are incorporated in the device to comply with the security requirements of this section. In addition, applications for certification of fixed, mobile, and Mode II white space devices shall identify at least one of the white space databases operated by a designated white space database administrator that the device will access for channel availability and affirm that the device will conform to the communications security methods used by that database.
k Requirements for mobile white space devices. 1 Mobile white space devices shall operate within geo-fenced areas over which the white space database has determined channel availability. A mobile white space device shall have the capability to internally store the boundaries of a geofenced area and determine its location with respect to those boundaries. The area boundaries stored within a mobile white space device must be the same as those used by the white space database to determine channel availability.
2 A mobile white space device shall incorporate a geo-location capability to determine its geographic coordinates. A
mobile white space device may obtain its geographic coordinates through an external geo-location source, provided that source is on the same vehicle or other mobile platform as the mobile device. An external geo-location source may be connected to a mobile device through either a wired or a wireless connection, and a single geo-location source may provide location information to multiple mobile devices on the same mobile platform. An external geo-location source must be connected to a mobile device using a secure connection that ensures that only an external geo-location source that has been approved with a particular mobile device can provide geographic coordinates to that device. The geographic coordinates must be provided automatically by the external geo-location source to the mobile device; users may not manually enter them. Alternatively, an extender cable may be used to connect a remote receive
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