Goto Section: 15.709 | 15.712 | Table of Contents
FCC 15.711
Revised as of October 1, 2011
Goto Year:2010 |
2012
§ 15.711 Interference avoidance methods.
Except as provided in § 15.717, television channel availability for a
TVBD is determined based on the geo-location and database access method
described in paragraphs (a) and (b) of this section.
(a) Geo-location and database access. A TVBD shall rely on the
geo-location and database access mechanism to identify available
television channels consistent with the interference protection
requirements of § 15.712. Such protection will be provided for the
following authorized and unlicensed services: digital television
stations, digital and analog Class A, low power, translator and booster
stations; translator receive operations; fixed broadcast auxiliary
service links; private land mobile service/commercial radio service
(PLMRS/CMRS) operations; offshore radiotelephone service; low power
auxiliary services authorized pursuant to § § 74.801 through 74.882 of
this chapter, including wireless microphones and MVPD receive sites;
and unlicensed wireless microphones used by venues of large events and
productions/shows as provided under § 15.713(h)(8). In addition,
protection shall be provided in border areas near Canada and Mexico in
accordance with § 15.712(g).
(b) Geo-location and database access requirements. (1) The geographic
coordinates of a fixed TVBD shall be determined to an accuracy of +- 50
meters by either an incorporated geo-location capability or a
professional installer. In the case of professional installation, the
party who registers the fixed TVBD in the database will be responsible
for assuring the accuracy of the entered coordinates. The geographic
coordinates of a fixed TVBD shall be determined at the time of
installation and first activation from a power-off condition, and this
information may be stored internally in the TVBD. If the fixed TVBD is
moved to another location or if its stored coordinates become altered,
the operator shall re-establish the device's:
(i) Geographic location and store this information in the TVBD either
by means of the device's incorporated geo-location capability or
through the services of a professional installer; and
(ii) Registration with the database based on the device's new
coordinates.
(2) A Mode II personal/portable device shall incorporate a geo-location
capability to determine its geographic coordinates to an accuracy of +-
50 meters. A Mode II device must also re-establish its position each
time it is activated from a power-off condition and use its
geo-location capability to check its location at least once every 60
seconds while in operation, except while in sleep mode, i.e., in a mode
in which the device is inactive but is not powered-down.
(3)(i) Fixed devices must access a TV bands database over the Internet
to determine the TV channels that are available at their geographic
coordinates, taking into consideration the fixed device's antenna
height, prior to their initial service transmission at a given
location. Operation is permitted only on channels that are indicated in
the database as being available for such TVBDs. Fixed TVBDs shall
access the database at least once a day to verify that the operating
channels continue to remain available. Operation on a channel must
cease immediately if the database indicates that the channel is no
longer available. Fixed TVBD must adjust their use of channels in
accordance with channel availability schedule information provided by
their database for the 48-hour period beginning at the time of the
device last accessed the database for a list of available channels.
(ii) Mode II personal/portable devices must access a TV bands database
over the Internet to determine the TV channels that are available at
their geographic coordinates prior to their initial service
transmission at a given location. Operation is permitted only on
channels that are indicated in the database as being available for
personal/portable TVBDs. A Mode II personal/portable device must access
the database for a list of available channels each time it is activated
from a power-off condition and re-check its location and the database
for available channels if it changes location during operation by more
than 100 meters from the location at which it last accessed the
database. A Mode II personal/portable device that has been in a powered
state shall re-check its location and access the database daily to
verify that the operating channel(s) continue to be available. Mode II
personal/portable devices must adjust their use of channels in
accordance with channel availability schedule information provided by
their database for the 48-hour period beginning at the time of the
device last accessed the database for a list of available channels. A
Mode II personal/portable device may load channel availability
information for multiple locations around, i.e., in the vicinity of,
its current location and use that information in its operation. A Mode
II TVBD may use such available channel information to define a
geographic area within which it can operate on the same available
channels at all locations, for example a Mode II TVBD could calculate a
bounded area in which a channel or channels are available at all
locations within the area and operate on a mobile basis within that
area. A Mode II TVBD using such channel availability information for
multiple locations must contact the database again if/when it moves
beyond the boundary of the area where the channel availability data is
valid, and must access the database daily even if it has not moved
beyond that range to verify that the operating channel(s) continue to
be available. Operation must cease immediately if the database
indicates that the channel is no longer available.
(iii) If a fixed or Mode II personal/portable TVBD fails to
successfully contact the TV bands database during any given day, it may
continue to operate until 11:59 p.m. of the following day at which time
it must cease operations until it re-establishes contact with the TV
bands database and re-verifies its list of available channels.
(iv) A Mode I personal/portable TVBD may only transmit upon receiving a
list of available channels from a fixed or Mode II TVBD that has
contacted a database and verified that the FCC identifier (FCC ID) of
the Mode I device is valid. The list of channels provided to the Mode I
device must be the same as the list of channels that are available to
the fixed or Mode II device, except that a Mode I device may operate
only on channels that are permissible for its use under § 15.707. A
fixed device may also obtain from a database a separate list of
available channels that includes adjacent channels that would be
available to a Mode I personal/portable device and provide that list to
the Mode I device. A fixed or Mode II device may provide a Mode I
device with a list of available channels only after it contacts its
database, provides the database the FCC Identifier (FCC ID) of the Mode
I device requesting available channels, and receives verification that
the FCC ID is valid for operation. To initiate contact with a fixed or
Mode II device, a Mode I device may transmit on an available channel
used by the fixed or Mode II TVBD or on a channel the fixed or Mode II
TVBD indicates is available for use by a Mode I device on a signal
seeking such contacts. At least once every 60 seconds, except when in
sleep mode, i.e., a mode in which the device is inactive but is not
powered-down, a Mode I device must either receive a contact
verification signal from the Mode II or fixed device that provided its
current list of available channels or contact a Mode II or fixed device
to re-verify/re-establish channel availability. A Mode I device must
cease operation immediately if it does not receive a contact
verification signal or is not able to re-establish a list of available
channels through contact with a fixed or Mode II device on this
schedule. In addition, a Mode II device must re-check/reestablish
contact with a fixed or Mode II device to obtain a list of available
channels if they lose power. Collaterally, if a Mode II device loses
power and obtains a new channel list, it must signal all Mode I devices
it is serving to acquire new channel list.
(v) Device manufacturers and database administrators may implement a
system that pushes updated channel availability information from the
database to TVBDs. However, the use of such systems is not mandatory,
and the requirements for TVBDs to validate the operating channel at
least daily and to cease operation in accordance with paragraph
(b)(3)(iii) of this section continue to apply if such a system is used.
(vi) TV bands devices shall incorporate adequate security measures to
ensure that they are capable of communicating for purposes of obtaining
lists of available channels only with databases operated by
administrators authorized by the Commission, and to ensure that
communications between TV bands devices and databases between TV bands
devices are secure to prevent corruption or unauthorized interception
of data. This requirement includes implementing security for
communications between Mode I personal portable devices and fixed or
Mode II devices for purposes of providing lists of available channels.
(4) All geographic coordinates shall be referenced to the North
American Datum of 1983 (NAD 83).
(c) Display of available channels. A TVBD must incorporate the
capability to display a list of identified available channels and its
operating channels.
(d) Identifying information. Fixed TVBDs shall transmit identifying
information. The identification signal must conform to a standard
established by a recognized industry standards setting organization.
The identification signal shall carry sufficient information to
identify the device and its geographic coordinates.
(e) Fixed devices without a direct connection to the Internet. If a
fixed TVBD does not have a direct connection to the Internet and has
not yet been initialized and registered with the TV bands database
consistent with § 15.713, but can receive the transmissions of another
fixed TVBD, the fixed TVBD needing initialization may transmit to that
other fixed TVBD on either a channel that the other TVBD has
transmitted on or on a channel which the other TVBD indicates is
available for use to access the database to register its location and
receive a list of channels that are available for it to use.
Subsequently, the newly registered TVBD must only use the television
channels that the database indicates are available for it to use. A
fixed device may not obtain lists of available channels from another
fixed device as provided by a TV bands database for such other device,
i.e., a fixed device may not simply operate on the list of available
channels provided by a TV bands database for another fixed device with
which it communicates but must contact a database to obtain a list of
available channels on which it may operate.
(f) Security. (1) For purposes of obtaining a list of available
channels and related matters, fixed and Mode II TVBDs shall only be
capable of contacting databases operated by FCC designated
administrators.
(2) Communications between TV bands devices and TV bands databases are
to be transmitted using secure methods that ensure against corruption
or unauthorized modification of the data; this requirement applies to
communications of channel availability and other spectrum access
information between fixed and Mode II devices (it is not necessary for
TVBDs to apply security coding to channel availability and channel
access information where they are not the originating or terminating
device and that they simply pass through).
(3) Communications between a Mode I device and a fixed or Mode II
device for purposes of obtaining a list of available channels shall
employ secure methods that ensure against corruption or unauthorized
modification of the data. When a Mode I device makes a request to a
fixed or Mode II device for a list of available channels the receiving
device shall check with the TV bands database that the Mode I device
has a valid FCC Identifier before providing a list of available
channels. Contact verification signals transmitted for Mode I devices
are to be encoded with encryption to secure the identity of the
transmitting device. Mode I devices using contact verification signals
shall accept as valid for authorization only the signals of the device
from which they obtained their list of available channels.
(4) A TV bands database shall be protected from unauthorized data input
or alteration of stored data. To provide this protection, the
administrator of the TV bands database administrator shall establish
communications authentication procedures that allow the fixed or Mode
II devices to be assured that the data they receive is from an
authorized source.
(5) Applications for certification of TV bands devices are to include a
high level operational description of the technologies and measures
that are incorporated in the device to comply with the security
requirements of this section. In addition, applications for
certification of fixed and Mode II devices are to identify at least one
of the TV bands databases operated by a designated TV bands database
administrator that the device will access for channel availability and
affirm that the device will conform to the communications security
methods used by that database.
(g) A personal/portable TVBD operating in Mode I may only transmit upon
receiving the transmissions of fixed or Mode II TVBD. A
personal/portable device operating in Mode I may transmit on either an
operating channel of the fixed or Mode II TVBD or on a channel the
fixed or Mode II TVBD indicates is available for use.
[ 74 FR 7326 , Feb. 17, 2009, as amended at 75 FR 75837 , Dec. 6, 2010]
Goto Section: 15.709 | 15.712
Goto Year: 2010 |
2012
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