Manual

ANSI C63.17-2006
Methods of Measurement of the Electromagnetic and Operational Compatibility of UPCS Devices
47CFR15, Subpart D—Unlicensed PCS Devices, as of December 29 2004 ANSI test
Monitoring time 15.323(c)(1)
Immediately prior to initiating transmission, devices must monitor the
combined time and spectrum windows in which they intend to transmit
for a period of at least 10 milliseconds for systems designed to use a 10
millisecond or shorter frame period or at least 20 milliseconds for systems
designed to use a 20 millisecond frame period.
7.3.4
Monitoring
threshold
15.323(c)(2)
The monitoring threshold must not be more than 30 dB above the thermal
noise power for a bandwidth equivalent to the emission bandwidth of the
device.
7.3.1
Maximum transmit
period
15.323(c)(3)
If no signal above the threshold level is detected, transmission may
commence and continue with the same emission bandwidth in the
monitored time and spectrum windows without further monitoring.
However, occupation of the same combined time and spectrum windows
by a device or group of cooperating devices continuously over a period of
time longer than 8 hours is not permitted without repeating the access
criteria.
8.2.2
System
acknowledgement
15.323(c)(4)
Once access to specific combined time and spectrum windows is obtained
an acknowledgement from a system participant must be received by the
initiating transmitter within one second or transmission must cease.
Periodic acknowledgements must be received at least every 30 seconds or
transmission must cease. Channels used exclusively for control and
signaling information may transmit continuously for 30 seconds without
receiving an acknowledgement, at which time the access criteria must be
repeated.
8.1 or 8.2
Least interfered
channel (LIC)
15.323(c)(5)
LIC selection 15.323(c)(5).1
If access to spectrum is not available as determined by the above and a
minimum of 40 duplex system access channels are defined for the system,
the time and spectrum windows with the lowest power level below a
monitoring threshold of 50 dB above the thermal noise power determined
for the emission bandwidth may be accessed.
7.3.2 and 7.3.3
LIC confirmation 15.323(c)(5).2
A device utilizing the provisions of this paragraph must have monitored
all access channels defined for its system within the last 10 seconds and
must verify, within the 20 milliseconds (40 milliseconds for devices
designed to use a 20 millisecond frame period) immediately preceding
actual channel access, that the detected power of the selected time and
spectrum windows is no higher than the previously detected value.
7.3.3 and 7.3.4
Power
measurement
resolution
15.323(c)(5).3
The power measurement resolution for this comparison must be accurate
to within 6 dB.
7.3.3
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