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Federal Register / Vol. 86, No. 7 / Tuesday, January 12, 2021 / Rules and Regulations
portable devices, and proposed to limit such operations to less congested areas to limit their potential for causing harmful interference. The Commission proposed to permit a higher power Mode II white space device installed on a movable platform to load channel availability information for multiple locations in the vicinity of its current location and to use that information to define a geo-fenced area within which it can operate on the same available channels at all locations. The Commission also proposed to require that the white space devices location be checked at least once every 60 seconds while in operation unless in sleep mode. The Commission further proposed that a device may not use channel availability information for multiple locations if or when it moves closer than 1.6 kilometers to the boundary of the geo-fenced area in which the device operates, or at any point outside that boundary; this requirement would ensure that a device moving at 60 miles per hour 1.6
kilometers per minute does not cross outside the boundary between device rechecks of its location. Additionally, the Commission proposed to prohibit operation on board aircraft or satellites to limit the range at which harmful interference could occur.
45. The Commission sought comment on a number of equipment issues for higher power geo-fenced mobile operations, including whether to permit fixed devices to operate on mobile platforms, the antenna and equipment authorization requirements that should apply, and whether the Commission should establish a new class of higher power mobile device to distinguish such devices from personal/portable white space devices. The Commission also sought comment on other requirements for higher power mobile white space devices, including whether to place limitations on the size of the area over which a geo-fenced mobile device could operate, the appropriate maximum power, whether there is a need to specify how information on an area will be provided to the white space database, and any other safeguards needed to ensure that higher power mobile devices do not cause harmful interference to protected operations. The Commission further sought comment on whether there is a need to prohibit operation on other mobile platforms such as trains and boats.
46. The Commission permits the operation of higher power mobile devices within defined geo-fenced areas in less congested areas, as proposed in the NPRM. A number of parties support this change, stating that it will
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benefit Americans in rural and underserved areas by permitting new agricultural applications and enabling broadband communications with moving vehicles such as school buses.
The Commission implements this change by establishing a new class of higher power mobile white space device, rather than by modifying the Mode II personal/portable device rules as proposed in the NPRM and supported by Shure and Sennheiser, or by allowing fixed devices to operate on mobile platforms as suggested by Microsoft in its petition and supported by RED
Technologies. The Commission agrees with commenters that establishing a new class of mobile white space device would be simpler than modifying the Mode II personal/portable device rules to permit higher power operation, and that this approach is more congruous than an approach providing for a fixed device on mobile platform as initially suggested by Microsoft. The Commission uses the term mobile device to refer to this class of white space devices to distinguish them from personal/portable white space devices.
As suggested by Shure, the Commission is clearly indicating in the rules that mobile devices may operate only in less congested areas by adding this requirement to the definition of mobile white space device.
47. The Commission permits mobile devices to operate at the same radiated power level permitted for fixed devices in less congested areas, i.e., up to 16
watts EIRP. This power level will enable the provision of new types of mobile broadband services in rural and other unserved areas. Because the Commission is permitting power levels that are the same as fixed devices, it believes that many of the technical requirements that apply to fixed devices are also appropriate for the new class of mobile white space devices.
Accordingly, the Commission requires mobile devices to comply with the same transmitter power limits as fixed devices, including maximum in-band power, adjacent channel emissions, power spectral density, and out-of-band emissions, as well as require them to meet the same antenna gain requirements as fixed devices. Under these requirements, a mobile device will be permitted to operate with a maximum transmitter power output of one watt, and can use an antenna with a gain of up to 12 dBi to achieve an EIRP
of 16 watts. If the maximum gain of the antenna exceeds 12 dBi, then the transmitter power must be reduced by the same amount in dB that the antenna gain exceeds 12 dBi. Because mobile
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devices change direction as they travel, the Commission permits the use of electrically steerable directional antennas to help enable mobile devices to remain in contact with their associated base unit or another mobile device.
48. The white space database will determine channel availability over a defined geo-fenced area where a mobile device will operate. In order to provide flexibility for manufacturers and mobile device operators, the Commission does not specify how the boundaries of an area are entered into and stored within the white space database or a mobile device. The Commission does, however, require that both the white space database and mobile device contain the same boundary information. This requirement will ensure that mobile devices operate only where the database has determined available channels.
Because mobile devices will operate at the same maximum power level as fixed devices, the Commission requires that the database use the same minimum required separation distances from protected services in the TV bands as fixed devices in determining available channels. This includes all protected services, including the PLMRS/CMRS, as noted by NPSTC. For simplicity of operation, the Commission requires that any channel identified by the database as available within the geo-fenced area must be available at the same power level over an entire geo-fenced area.
49. The Commission recognizes that there are some complexities in determining the available channels over a contiguous geo-fenced area. The current white space database system determines channel availability at discrete locations since it was designed to implement rules that require devices to determine their geographic coordinates at a single location and submit those coordinates to the database when requesting a list of available channels. The database system would have to use a modified methodology for determining available channels over a geo-fenced area. For example, it could divide the area into cells, e.g., 100 by 100-meters, and determine channel availability within each cell. The Commission will not prescribe the exact method that database administrators must use to determine channel availability within geo-fenced areas, but mobile white space devices must comply with the minimum required separation distances from protected services at any point within a geofenced area. The white space database will have to consider a mobile devices HAAT in determining available channels and consider any variation in
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