FCC 90.377 Revised as of October 1, 2007
Goto Year:2006 |
2008
Sec. 90.377 Frequencies available; maximum EIRP and antenna height, and priority
communications.
(a) Licensees shall transmit only the power (EIRP) needed to communicate
with an On-Board Unit (OBU) within the communications zone and must take
steps to limit the Roadside Unit (RSU) signal within the zone to the maximum
extent practicable.
(b) Frequencies available for assignment to eligible applicants within the
5850–5925 MHz band for RSUs and the maximum EIRP permitted for an RSU with
an antenna height not exceeding 8 meters above the roadway bed surface are
specified in the table below. Where two EIRP limits are given, the higher
limit is permitted only for state or local governmental entities.
Channel No. Frequency range
(MHz) Max. EIRP^1
(dBm) Channel use
170 5850–5855 Reserved.
172 5855–5865 33 Service Channel.^2
174 5865–5875 33 Service Channel.
175 5865–5885 23 Service Channel.^3
176 5875–5885 33 Service Channel.
178 5885–5895 33/44.8 Control Channel.
180 5895–5905 23 Service Channel.
181 5895–5915 23 Service Channel.^3
182 5905–5915 23 Service Channel.
184 5915–5925 33/40 Service Channel.^4
^1An RSU may employ an antenna with a height exceeding 8 meters but not
exceeding 15 meters provided the EIRP specified in the table above is
reduced by a factor of 20 log(Ht/8) in dB where Ht is the height of the
radiation center of the antenna in meters above the roadway bed surface. The
EIRP is measured as the maximum EIRP toward the horizon or horizontal,
whichever is greater, of the gain associated with the main or center of the
transmission beam. The RSU antenna height shall not exceed 15 meters above
the roadway bed surface.
^2Channel 172 is designated for public safety applications involving safety
of life and property.
^3Channel Nos. 174/176 may be combined to create a twenty megahertz channel,
designated Channel No. 175. Channels 180/182 may be combined to create a
twenty-megahertz channel, designated Channel No. 181.
^4Channel 184 is designated for public safety applications involving safety
of life and property. Only those entities meeting the requirements of
Sec. 90.373(a) are eligible to hold an authorization to operate on this channel.
(c) Except as provided in paragraphs (d) and (e) of this section,
non-reserve DSRCS channels are available on a shared basis only for use in
accordance with the Commission's rules. All licensees shall cooperate in the
selection and use of channels in order to reduce interference. This includes
monitoring for communications in progress and any other measures as may be
necessary to minimize interference. Licensees of RSUs suffering or causing
harmful interference within a communications zone are expected to cooperate
and resolve this problem by mutually satisfactory arrangements. If the
licensees are unable to do so, the Commission may impose restrictions
including specifying the transmitter power, antenna height and direction,
additional filtering, or area or hours of operation of the stations
concerned. Further the use of any channel at a given geographical location
may be denied when, in the judgment of the Commission, its use at that
location is not in the public interest; use of any such channel may be
restricted as to specified geographical areas, maximum power, or such other
operating conditions, contained in this part or in the station
authorization.
(d) Safety/public safety priority. The following access priority governs all
DSRCS operations:
(1) Communications involving the safety of life have access priority over
all other DSRCS communications;
(2) Subject to a control channel priority system management strategy ( see
ASTM E2213–03 DSRC Standard at Sec. 4.1.1.2(4)), DSRCS communications involving
public safety have access priority over all other DSRC communications not
listed in paragraph (d)(1) of this section. Roadside Units (RSUs) operated
by state or local governmental entities are presumptively engaged in public
safety priority communications.
(e) Non-priority communications. DSRCS communications not listed in
paragraph (d) of this section, are non-priority communications. If a dispute
arises concerning non-priority communications, the licensee of the
later-registered RSU must accommodate the operation of the early registered
RSU, i.e. , interference protection rights are date-sensitive, based on the
date that the RSU is first registered ( see Sec. 90.375) and the
later-registered RSU must modify its operations to resolve the dispute in
accordance with paragraph (f) of this section.
(f) Except as otherwise provided in the ASTM–DSRC Standard ( see Sec. 90.379)
for the purposes of paragraph (e) of this section, objectionable
interference will be considered to exist when the Commission receives a
complaint and the difference in signal strength between the
earlier-registered RSU and the later-registered RSU (anywhere within the
earlier-registered RSU's communication zone) is 18 dB or less (co-channel).
Later-registered RSUs causing objectionable interference must correct the
interference immediately unless written consent is obtained from the
licensee of the earlier-registered RSU.
[ 71 FR 52749 , Sept. 7, 2006, as amended at 72 FR 35199 , June 27, 2007]
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