FCC 22.911
Revised as of October 1, 2014
Goto Year:2013 | 2015
```§ 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 area outside the
cellular market boundary, except as provided in paragraph (c) of this
section, and excluding any 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
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
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 dBuV/m
(i.e. does not exceed 32 dBuV/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 45DEG 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) CGSA extension areas. SAB extensions (areas outside of the cellular
market boundary, but within the service area as calculated using the
methods of paragraph (a) of this section) are part of the CGSA only
under the following circumstances:

(1) During the five year build-out period of the system in the cellular
market containing the extension, the licensees of systems on the same
channel block in adjacent cellular markets may agree that the portion
of the service area of one system that extends into unserved areas in
the other system's cellular market is part of the CGSA of the former
system.

(2) At the end of the five year build-out period of the system in the
cellular market containing the extension, the portion of the service
area that extends into unserved areas in another cellular market
becomes part of the CGSA, provided that the licensee of the system so
extended files a system information update in accordance with
§ 22.947(c).

(3) For original systems in MSAs, extensions of the CGSA authorized by
the FCC are part of the CGSA to the extent authorized.

(d) Protection afforded. Within the CGSA determined in accordance with
this section, cellular systems are entitled to protection from
co-channel and first-adjacent channel interference and from capture of
subscriber traffic by adjacent systems on the same channel block.

channel interference by changing channels used at specific cells or by
other technical means.

(2) Protection from capture of subscriber traffic is applied and
limited in accordance with the following:

(i) Subscriber traffic is captured if an SAB of one cellular system
overlaps the CGSA of another operating cellular system. Therefore,
cellular licensees must not begin to operate any facility that would
cause an SAB to overlap the existing CGSA of another cellular system on
the same channel block, without first obtaining the written consent of
to operate existing facilities that produce an SAB overlapping a
subsequently-authorized portion of the CGSA of another cellular system
on the same channel block until the licensee of that system requests
that the SAB be removed from its CGSA. Such request may be made
directly to the licensee of the overlapping system or to the FCC. In
the event such request is made, the licensee of the overlapping system
must reduce the transmitting power or antenna height (or both) at the
pertinent cell site as necessary to remove the SAB from the CGSA of the
other system, unless a written consent from the licensee of the other
system allowing the SAB to remain is obtained. Cellular licensees may
enter into contracts with the licensees of other cellular systems on
the same channel block to allow SABs to overlap CGSAs.

(ii) Cellular licensees are at most entitled to have a CGSA free of
SABs from other cellular systems on the same channel block.

(e) Unserved areas. Unserved areas are areas 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]