Goto Section: 15.701 | 15.705 | Table of Contents
Revised as of October 1, 2020
Goto Year:2019 |
§ 15.703 Definitions.
(a) 600 MHz duplex gap. An 11 megahertz guard band at 652-663 MHz that
separates part 27 600 MHz service uplink and downlink frequencies.
(b) 600 MHz guard band. Designated frequency band at 614-617 MHz that
prevents interference between licensed services in the 600 MHz service
band and channel 37.
(c) 600 MHz service band. Frequencies in the 617-652 MHz and 663-698
MHz bands that are reallocated and reassigned for 600 MHz band services
under part 27 of this chapter.
(d) Available channel. A channel which is not being used by an
authorized service and is acceptable for use by the device at its
geographic location under the provisions of this subpart.
(e) Contact verification signal. An encoded signal broadcast by a fixed
or Mode II device for reception by Mode I devices to which the fixed or
Mode II device has provided a list of available channels for operation.
Such signal is for the purpose of establishing that the Mode I device
is still within the reception range of the fixed or Mode II device for
purposes of validating the list of available channels used by the Mode
I device and shall be encoded to ensure that the signal originates from
the device that provided the list of available channels. A Mode I
device may respond only to a contact verification signal from the fixed
or Mode II device that provided the list of available channels on which
it operates. A fixed or Mode II device shall provide the information
needed by a Mode I device to decode the contact verification signal at
the same time it provides the list of available channels.
(f) Fixed device. A white space device that transmits and/or receives
radiocommunication signals at a specified fixed location. A fixed
device may select channels for operation from a list of available
channels provided by a white space database, and initiate and operate a
network by sending enabling signals to one or more fixed devices and/or
personal/portable devices. Fixed devices may provide to a Mode I
personal/portable device a list of available channels on which the Mode
I device may operate, including channels on which the Mode I device but
not the fixed device may operate.
(g) Geo-location capability. The capability of a white space device to
determine its geographic coordinates and geo-location uncertainty. This
capability is used with a white space database approved by the FCC to
determine the availability of spectrum at a white space device's
(h) Less congested area. Geographic areas where at least half of the TV
channels for the bands that will continue to be allocated and assigned
only for broadcast service are unused for broadcast and other protected
services and available for white space device use. Less congested areas
in the UHF TV band are also considered to be less congested areas in
the 600 MHz service band.
(i) Mode I personal/portable device. A personal/portable white space
device that does not use an internal geo-location capability and access
to a white space database to obtain a list of available channels. A
Mode I device must obtain a list of available channels on which it may
operate from either a fixed white space device or Mode II
personal/portable white space device. A Mode I device may not initiate
a network of fixed and/or personal/portable white space devices nor may
it provide a list of available channels to another Mode I device for
operation by such device.
(j) Mode II personal/portable device. A personal/portable device that
uses an internal geo-location capability and access to a white space
database, either through a direct connection to the Internet or through
an indirect connection to the Internet by way of fixed device or
another Mode II device, to obtain a list of available channels. A Mode
II device may select a channel itself and initiate and operate as part
of a network of white space devices, transmitting to and receiving from
one or more fixed devices or personal/portable devices. A Mode II
personal/portable device may provide its list of available channels to
a Mode I personal/portable device for operation on by the Mode I
(k) Network initiation. The process by which a fixed or Mode II white
space device sends control signals to one or more fixed white space
devices or personal/portable white space devices and allows them to
(l) Operating channel. An available channel used by a white space
device for transmission and/or reception.
(m) Personal/portable device. A white space device that transmits
and/or receives radiocommunication signals on available channels at
unspecified locations that may change.
(n) Receive site. The location where the signal of a full service
television station is received for rebroadcast by a television
translator or low power TV station, including a Class A TV station, or
for distribution by a Multiple Video Program Distributor (MVPD) as
defined in 47 U.S.C. 602(13).
(o) Sensing only device. A personal/portable white space device that
uses spectrum sensing to determine a list of available channels.
Sensing only devices may transmit on any available channels in the
frequency bands 512-608 MHz (TV channels 21-36).
(p) Spectrum Act. Title VI of the Middle Class Tax Relief and Job
Creation Act of 2012 (Pub. L. 112-96).
(q) Spectrum sensing. A process whereby a white space device monitors a
television channel to detect whether the channel is occupied by a radio
signal or signals from authorized services.
(r) Television bands. The broadcast television frequency bands at 54-72
MHz (TV channels 2-4), 76-88 MHz (TV channels 5-6), 174-216 MHz (TV
channels 7-13) and 470-608 MHz (channels 14-36).
(s) White space database. A database system approved by the Commission
that maintains records on authorized services and provides lists of
available channels to white space devices and unlicensed wireless
[ 80 FR 73070 , Nov. 23, 2015, as amended at 84 FR 34796 , July 19, 2019]
Goto Section: 15.701 | 15.705
Goto Year: 2019 |
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