Goto Section: 15.401 | 15.405 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 15.403 Definitions.
Access Point (AP). A U-NII transceiver that operates either as a bridge
in a peer-to-peer connection or as a connector between the wired and
wireless segments of the network or as a relay between wireless network
Automated Frequency Coordination (AFC) System. A system that
automatically determines and provides lists of which frequencies are
available for use by standard power access points operating in the
5.925-6.425 GHz and 6.525-6.875 GHz bands.
Available Channel. A radio channel on which a Channel Availability
Check has not identified the presence of a radar.
Average Symbol Envelope Power. The average symbol envelope power is the
average, taken over all symbols in the signaling alphabet, of the
envelope power for each symbol.
Channel Availability Check. A check during which the U-NII device
listens on a particular radio channel to identify whether there is a
radar operating on that radio channel.
Channel Move Time. The time needed by a U-NII device to cease all
transmissions on the current channel upon detection of a radar signal
above the DFS detection threshold.
Client Device. A U-NII device whose transmissions are generally under
the control of an access point and is not capable of initiating a
Contention-based protocol. A protocol that allows multiple users to
share the same spectrum by defining the events that must occur when two
or more transmitters attempt to simultaneously access the same channel
and establishing rules by which a transmitter provides reasonable
opportunities for other transmitters to operate. Such a protocol may
consist of procedures for initiating new transmissions, procedures for
determining the state of the channel (available or unavailable), and
procedures for managing retransmissions in the event of a busy channel.
Digital modulation. The process by which the characteristics of a
carrier wave are varied among a set of predetermined discrete values in
accordance with a digital modulating function as specified in document
Dynamic Frequency Selection (DFS) is a mechanism that dynamically
detects signals from other systems and avoids co-channel operation with
these systems, notably radar systems.
DFS Detection Threshold. The required detection level defined by
detecting a received signal strength (RSS) that is greater than a
threshold specified, within the U-NII device channel bandwidth.
Emission bandwidth. For purposes of this subpart the emission bandwidth
is determined by measuring the width of the signal between two points,
one below the carrier center frequency and one above the carrier center
frequency, that are 26 dB down relative to the maximum level of the
Fixed client device. For the purpose of this subpart, a client device
intended as customer premise equipment that is permanently attached to
a structure, operates only on channels provided by an AFC, has a
geolocation capability, and complies with antenna pointing angle
Indoor Access Point. For the purpose of this subpart, an access point
that operates in the 5.850-5.895 GHz or the 5.925-7.125 GHz band, is
supplied power from a wired connection, has an integrated antenna, is
not battery powered, and does not have a weatherized enclosure. Indoor
access point devices must bear the following statement in a conspicuous
location on the device and in the user's manual: FCC regulations
restrict operation of this device to indoor use only.
In-Service Monitoring. A mechanism to check a channel in use by the
U-NII device for the presence of a radar.
Non-Occupancy Period. The required period in which, once a channel has
been recognized as containing a radar signal by a U-NII device, the
channel will not be selected as an available channel.
Operating Channel. Once a U-NII device starts to operate on an
Available Channel then that channel becomes the Operating Channel.
Maximum Power Spectral Density. The maximum power spectral density is
the maximum power spectral density, within the specified measurement
bandwidth, within the U-NII device operating band.
Maximum Conducted Output Power. The total transmit power delivered to
all antennas and antenna elements averaged across all symbols in the
signaling alphabet when the transmitter is operating at its maximum
power control level. Power must be summed across all antennas and
antenna elements. The average must not include any time intervals
during which the transmitter is off or is transmitting at a reduced
power level. If multiple modes of operation are possible (e.g.,
alternative modulation methods), the maximum conducted output power is
the highest total transmit power occurring in any mode.
Power Spectral Density. The power spectral density is the total energy
output per unit bandwidth from a pulse or sequence of pulses for which
the transmit power is at its maximum level, divided by the total
duration of the pulses. This total time does not include the time
between pulses during which the transmit power is off or below its
Pulse. A pulse is a continuous transmission of a sequence of modulation
symbols, during which the average symbol envelope power is constant.
RLAN. Radio Local Area Network.
Standard Power Access Point. An access point that operates in the
5.925-6.425 GHz and 6.525-6.875 GHz bands pursuant to direction from an
Automated Frequency Coordination System.
Subordinate Device. For the purpose of this subpart, a device that
operates in the 5.850-5.895 GHz band or in the 5.925-7.125 GHz band
under the control of an Indoor Access Point, is supplied power from a
wired connection, has an integrated antenna, is not battery powered,
does not have a weatherized enclosure, and does not have a direct
connection to the internet. Subordinate devices must not be used to
connect devices between separate buildings or structures. Subordinate
devices must be authorized under certification procedures in part 2 of
this chapter. Modules may not be certified as subordinate devices.
Transmit Power Control (TPC). A feature that enables a U-NII device to
dynamically switch between several transmission power levels in the
data transmission process.
U-NII devices. Intentional radiators operating in the frequency bands
5.15-5.35 GHz, 5.47-5.895 GHz, and 5.925-7.125 GHz that use wideband
digital modulation techniques and provide a wide array of high data
rate mobile and fixed communications for individuals, businesses, and
[ 85 FR 31410 , May 26, 2020, as amended at 86 FR 23295 , May 3, 2021]
Goto Section: 15.401 | 15.405
Goto Year: 2020 |
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