Goto Section: 27.1220 | 27.1222 | Table of Contents
FCC 27.1221
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 27.1221 Interference protection.
(a) Interference protection will be afforded to BRS and EBS on a
station-by-station basis based on the heights of the stations in the LBS and
UBS and also on height benchmarking, although the heights of antennas
utilized are not restricted.
(b) Height benchmarking. Height benchmarking is defined for pairs of base
stations, one in each of two proximate geographic service areas (GSAs). The
height benchmark, which is defined in meters (hbm) for a particular base
station relative to a base station in another GSA, is equal to the distance,
in kilometers, from the base station along a radial to the nearest point on
the GSA boundary of the other base station squared (Dkm2) and then divided
by 17. That is, hb (m) = Dkm2/17. A base station antenna will be considered
to be within its applicable height benchmark relative to another base
station if the height in meters of its centerline of radiation above average
elevation (HAAE) calculated along the straight line between the two base
stations in accordance with § 24.53(b) and (c) of this chapter does not
exceed the height benchmark (hbm). A base station antenna will be considered
to exceed its applicable height benchmark relative to another base station
if the HAAE of its centerline of radiation calculated along the straight
line between the two base stations in accordance with § 24.53(b) and (c) of
this chapter exceeds the height benchmark (hbm).
(c) Protection for receiving antennas not exceeding the height benchmark.
Absent agreement between the two licensees to the contrary, if a
transmitting antenna of one BRS/EBS licensee's base station exceeds its
applicable height benchmark and such licensee is notified by another BRS/EBS
licensee that it is generating an undesired signal level in excess of −107
dBm/5.5 megahertz at the receiver of a co-channel base station that is
within its applicable height benchmark, then the licensee of the base
station that exceeds its applicable height benchmark shall either limit the
undesired signal at the receiver of the protected base station to
−107dBm/5.5 megahertz or less or reduce the height of its transmission
antenna to no more than the height benchmark. If the interfering base
station has been modified to increase the EIRP transmitted in the direction
of the protected base station, it shall be deemed to have commenced
operations on the date of such modification. Such corrective action shall be
completed no later than:
(i) 24 hours after receiving such notification, if the base station that
exceeds its height benchmark commenced operations after the station that is
within its applicable height benchmark; or
(ii) 90 days after receiving such notification, if the base station that
exceeds its height commenced operations prior to the station that is within
its applicable height benchmark. For purposes of this section, if the
interfering base station has been modified to increase the EIRP transmitted
in the direction of the victim base station, it shall be deemed to have
commenced operations on the date of such modification.
(d) No Protection from a transmitting antenna not exceeding the height
benchmark. The licensee of a base station transmitting antenna less than or
equal to its applicable height benchmark shall not be required pursuant to
paragraph (c) of this section to limit that antennas undesired signal level
to −107dBm/5.5 megahertz or less at the receiver of any co-channel base
station.
(e) No protection for a receiving-antenna exceeding the height benchmark.
The licensee of a base station receive antenna that exceeds its applicable
height benchmark shall not be entitled pursuant to paragraph (c) of this
section to insist that any co-channel base station limit its undesired
signal level to −107dBm/5.5 megahertz or less at the receiver.
(f) Information exchange. A BRS/EBS licensee shall provide the geographic
coordinates, the height above ground level of the center of radiation for
each transmit and receive antenna, and the date transmissions commenced for
each of the base stations in its GSA within 30 days of receipt of a request
from a co-channel BRS/EBS licensee with an operational base station located
in a proximate GSA. Information shared pursuant to this section shall not be
disclosed to other parties except as required to ensure compliance with this
section.
[ 69 FR 72034 , Dec. 10, 2004, as amended at 70 FR 1190 , Jan. 6, 2005; 71 FR 35191 , June 19, 2006; 73 FR 26041 , May 8, 2008]
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Goto Section: 27.1220 | 27.1222
Goto Year: 2014 |
2016
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