Goto Section: 22.909 | 22.912 | Table of Contents
FCC 22.911
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 22.911 Cellular geographic service area.
The Cellular Geographic Service Area (CGSA) of a cellular system is the
geographic area considered by the FCC to be served by the cellular system.
The CGSA is the area within which cellular systems are entitled to
protection and within which adverse effects for the purpose of determining
whether a petitioner has standing are recognized.
(a) CGSA determination. The CGSA is the composite of the service areas of
all of the cells in the system, excluding any Unserved Area (even if it is
served on a secondary basis) or area within the CGSA of another Cellular
system. The service area of a cell is the area within its service area
boundary (SAB). The distance to the SAB is calculated as a function of
effective radiated power (ERP) and antenna center of radiation height above
average terrain (HAAT), height above sea level (HASL), or height above mean
sea level (HAMSL).
(1) Except as provided in paragraphs (a)(2) and (b) of this section, the
distance from a cell transmitting antenna to its SAB along each cardinal
radial is calculated as follows:
d = 2.531 × h0.34 × p0.17
where:
d is the radial distance in kilometers
h is the radial antenna HAAT in meters
p is the radial ERP in Watts
(2) The distance from a cell transmitting antenna located in the Gulf of
Mexico Service Area (GMSA) to its SAB along each cardinal radial is
calculated as follows:
d = 6.895 × h0.30 × p0.15
Where:
d is the radial distance in kilometers
h is the radial antenna HAAT in meters
p is the radial ERP in Watts
(3) The value used for h in the formula in paragraph (a)(2) of this section
must not be less than 8 meters (26 feet) HASL (or HAMSL, as appropriate for
the support structure). The value used for h in the formula in paragraph
(a)(1) of this section must not be less than 30 meters (98 feet) HAAT,
except that for unserved area applications proposing a cell with an ERP not
exceeding 10 Watts, the value for h used in the formula in paragraph (a)(1)
of this section to determine the service area boundary for that cell may be
less than 30 meters (98 feet) HAAT, but not less than 3 meters (10 feet)
HAAT.
(4) The value used for p in the formulas in paragraphs (a)(1) and (a)(2) of
this section must not be less than 0.1 Watt or 27 dB less than (1/500 of)
the maximum ERP in any direction, whichever is more.
(5) Whenever use of the formula in paragraph (a)(1) of this section pursuant
to the exception contained in paragraph (a)(3) of this section results in a
calculated distance that is less than 5.4 kilometers (3.4 miles), the radial
distance to the service area boundary is deemed to be 5.4 kilometers (3.4
miles).
(6) The distance from a cell transmitting antenna to the SAB along any
radial other than the eight cardinal radials is calculated by linear
interpolation of distance as a function of angle.
(b) Alternative CGSA determination. If a carrier believes that the method
described in paragraph (a) of this section produces a CGSA that departs
significantly (±20% in the service area of any cell) from the geographic
area where reliable cellular service is actually provided, the carrier may
submit, as an exhibit to an application for modification of the CGSA using
FCC Form 601, a depiction of what the carrier believes the CGSA should be.
Such submissions must be accompanied by one or more supporting propagation
studies using methods appropriate for the 800-900 MHz frequency range,
including all supporting data and calculations, and/or by extensive field
strength measurement data. For the purpose of such submissions, cellular
service is considered to be provided in all areas, including “dead spots”,
between the transmitter location and the locus of points where the predicted
or measured median field strength finally drops to 32 dBµV/m (i.e. does not
exceed 32 dBµV/m further out). If, after consideration of such submissions,
the FCC finds that adjustment to a CGSA is warranted, the FCC may grant the
application.
(1) The alternative CGSA determination must define the CGSA in terms of
distances from the cell sites to the 32 dBuV/m contour along the eight
cardinal radials, with points in other azimuthal directions determined by
the method given in paragraph (a)(6) of this section. The distances used for
the cardinal radials must be representative of the coverage within the 45°
sectors, as depicted by the alternative CGSA determination.
(2) If an uncalibrated predictive model is used to depict the CGSA, the
alternative CGSA determination must identify factors (e.g. terrain roughness
or features) that could plausibly account for the difference between actual
coverage and that defined by the formula in paragraph (a)(1) of this
section. If actual measurements or a measurement-calibrated predictive model
are used to depict the CGSA, and this fact is disclosed in the alternative
CGSA determination, it is not necessary to offer an explanation of the
difference between actual coverage and that defined by the formula in
paragraph (a)(1) of this section. If the formula in paragraph (a)(1) of this
section is clearly inapplicable for the cell(s) in question (e.g. for
microcells), this should be disclosed in the alternative CGSA determination.
(3) The provision for alternative CGSA determinations was made in
recognition that the formula in paragraph (a)(1) of this section is a
general model that provides a reasonable approximation of coverage in most
land areas, but may under-predict or over-predict coverage in specific areas
with unusual terrain roughness or features, and may be inapplicable for
certain purposes, e.g., cells with a coverage radius of less than 8
kilometers (5 miles). In such cases, alternative methods that utilize more
specific models are appropriate. Accordingly, the FCC does not consider use
of the formula in paragraph (a)(1) of this section with parameters outside
of the limits in paragraphs (a)(3), (a)(4) and (a)(5) of this section or
with data for radials other than the cardinal radials to be a valid
alternative method for determining the CGSA of a cellular system.
(c) [Reserved]
(d) Protection afforded. Cellular systems are entitled to protection only
within the CGSA (as determined in accordance with this section) from
co-channel and first-adjacent channel interference and from capture of
subscriber traffic by adjacent systems on the same channel block. Licensees
must cooperate in resolving co-channel and first-adjacent channel
interference by changing channels used at specific cells or by other
technical means.
(e) Unserved Area. Unserved Area is area outside of all existing CGSAs on
either of the channel blocks, to which the Communications Act of 1934, as
amended, is applicable.
[ 59 FR 59507 , Nov. 17, 1994, as amended at 59 FR 59954 , Nov. 21, 1994; 63 FR 68951 , Dec. 14, 1998; 67 FR 9609 , Mar. 4, 2002; 67 FR 77191 , Dec. 17, 2002;
68 FR 42295 , July 17, 2003; 79 FR 72151 , Dec. 5, 2014]
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Goto Section: 22.909 | 22.912
Goto Year: 2014 |
2016
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