Goto Section: 15.715 | 15.717 | Table of Contents
FCC 15.717
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 15.717 TVBDs that rely on spectrum sensing.
(a) Applications for certification. Parties may submit applications for
certification of TVBDs that rely solely on spectrum sensing to identify
available channels. Devices authorized under this section must demonstrate
with an extremely high degree of confidence that they will not cause harmful
interference to incumbent radio services.
(1) In addition to the procedures in subpart J of part 2 of this chapter,
applicants shall comply with the following.
(i) The application must include a full explanation of how the device will
protect incumbent authorized services against interference.
(ii) Applicants must submit a pre-production device, identical to the device
expected to be marketed.
(2) The Commission will follow the procedures below for processing
applications pursuant to this section.
(i) Applications will be placed on public notice for a minimum of 30 days
for comments and 15 days for reply comments. Applicants may request that
portions of their application remain confidential in accordance with § 0.459
of this chapter. This public notice will include proposed test procedures
and methodologies.
(ii) The Commission will conduct laboratory and field tests of the
pre-production device. This testing will be conducted to evaluate proof of
performance of the device, including characterization of its sensing
capability and its interference potential. The testing will be open to the
public.
(iii) Subsequent to the completion of testing, the Commission will issue by
public notice, a test report including recommendations. The public notice
will specify a minimum of 30 days for comments and, if any objections are
received, an additional 15 days for reply comments.
(b) Power limit for devices that rely on sensing. The TVBD shall meet the
requirements for personal/portable devices in this subpart except that it
will be limited to a maximum EIRP of 50 mW per 6 megahertz of bandwidth on
which the device operates and it does not have to comply with the
requirements for geo-location and database access in § 15.711(b). Compliance
with the detection threshold for spectrum sensing in § 15.717(c), although
required, is not necessarily sufficient for demonstrating reliable
interference avoidance. Once a device is certified, additional devices that
are identical in electrical characteristics and antenna systems may be
certified under the procedures of Part 2, Subpart J of this chapter.
(c) Sensing requirements—(1) Detection threshold. (i) The required detection
thresholds are:
(A) ATSC digital TV signals: −114 dBm, averaged over a 6 MHz bandwidth;
(B) NTSC analog TV signals: −114 dBm, averaged over a 100 kHz bandwidth;
(C) Low power auxiliary, including wireless microphone, signals: −107 dBm,
averaged over a 200 kHz bandwidth.
(ii) The detection thresholds are referenced to an omnidirectional receive
antenna with a gain of 0 dBi. If a receive antenna with a minimum
directional gain of less than 0 dBi is used, the detection threshold shall
be reduced by the amount in dB that the minimum directional gain of the
antenna is less than 0 dBi. Minimum directional gain shall be defined as the
antenna gain in the direction and at the frequency that exhibits the least
gain. Alternative approaches for the sensing antenna are permitted, e.g.,
electronically rotatable antennas, provided the applicant for equipment
authorization can demonstrate that its sensing antenna provides at least the
same performance as an omnidirectional antenna with 0 dBi gain.
(2) Channel availability check time. A TVBD may start operating on a TV
channel if no TV, wireless microphone or other low power auxiliary device
signals above the detection threshold are detected within a minimum time
interval of 30 seconds.
(3) In-service monitoring. A TVBD must perform in-service monitoring of an
operating channel at least once every 60 seconds. There is no minimum
channel availability check time for in-service monitoring.
(4) Channel move time. After a TV, wireless microphone or other low power
auxiliary device signal is detected on a TVBD operating channel, all
transmissions by the TVBD must cease within two seconds.
[ 75 FR 75842 , Dec. 6, 2010]
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Goto Section: 15.715 | 15.717
Goto Year: 2014 |
2016
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