Goto Section: 15.401 | 15.405 | Table of Contents
FCC 15.403
Revised as of October 1, 2006
Goto Year:2005 |
2007
Sec. 15.403 Definitions.
(a) 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.
(b) Available Channel. A radio channel on which a Channel Availability Check
has not identified the presence of a radar.
(c) 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.
(d) 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.
(e) 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.
(f) 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 ANSI
C63.17–1998.
(g) 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.
(h) 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.
(i) Emission bandwidth. For purposes of this subpart the emission bandwidth
shall be 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
modulated carrier. Determination of the emissions bandwidth is based on the
use of measurement instrumentation employing a peak detector function with
an instrument resolution bandwidth approximately equal to 1.0 percent of the
emission bandwidth of the device under measurement.
(j) In-Service Monitoring. A mechanism to check a channel in use by the
U-NII device for the presence of a radar.
(k) 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.
(l) Operating Channel. Once a U-NII device starts to operate on an Available
Channel then that channel becomes the Operating Channel.
(m) Peak Power Spectral Density. The peak power spectral density is the
maximum power spectral density, within the specified measurement bandwidth,
within the U-NII device operating band.
(n) 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.
(o) 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 peak or 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 maximum level.
(p) Pulse. A pulse is a continuous transmission of a sequence of modulation
symbols, during which the average symbol envelope power is constant.
(q) RLAN. Radio Local Area Network.
(r) 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.
(s) U-NII devices. Intentional radiators operating in the frequency bands
5.15–5.35 GHz and 5.470–5.825 GHz that use wideband digital modulation
techniques and provide a wide array of high data rate mobile and fixed
communications for individuals, businesses, and institutions.
[ 69 FR 2687 , Jan. 20, 2004, as amended at 69 FR 54036 , Sept. 7, 2004]
Goto Section: 15.401 | 15.405
Goto Year: 2005 |
2007
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