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and are in addition to the requirements specijied in the ITU
Radio Regulations (Appendix S27). The HFDL is a constituent
mobile subnetwork of the aeiwnautical telecommunication
network (ATN), operating in the aeronautical mobile (R) high
frequency bands. In addition, the HFDL may pmvide nan-ATN
functions, such as direct link service (DLS). The HFDL, system
must enable aircraji to exchange data with ground-bused users.
11.1.1 Definitions
Coded chip. A "1" or "0" output of the rate !h or %
convolutional code encoder.
Designated operational coverage (DOC) area. The area in
which a particular service is provided and in which the
service is afforded frequency protection.
Note.- This area may, after proper co-ordination to ensure
frequency protection, extend to areas outside the allotment
areas contained in Appendix S27 to the Radio Regulations.
Direct link service (DLS). A data communications service
which makes no attempt to automatically correct errors,
detected or undetected, at the link layer of the air-ground
communications path. (Error control may be effected by
end-uscr systems.)
High frequency network protocol data unit (HFNPDU) . User
data packet.
Link protocol data unit (LPDU). Data unit which
encapsulates a segment of an HFNPDU.
Media access protocol data unit (MPDU). Data unit which
encapsulates one or more LPDUs.
M-ury phase shqt keying (M-PSK) modulation. A digital
phase modulation that causes the phase of the camer
waveform to take on one of a set of M values.
M-PSK symbol. One of the M possible phase shifts of the
M-PSK modulated carrier representing a group of logz
M coded chips.
Peak emelope power (PEP). The peak power of the modulatcd
signal supplied by the transmitter to the antenna
transmission line.
Physical Zayer protocol data unit (PPDU). Data unit passed to
the physical layer for transmission, or decoded by the
physical layer after reception.
Quality of service (QOS). The information relating to data
transfcr characteristics used by various commmications
protocols to achieve various levels of performance for
network users.
Reliable link service (RLS). A data communications service
provided by the subnetwork which automatically provides
for error control over its link through error detection and
requested retransmission of signal units found to be in
error.
Squltter protocol data unit (SPDU). Data packet which is
broadcast every 32 seconds by an HFDL ground station on
each of its operating frequencies, and which contains link
management information.
11.2 HF DATA LINK SYSTEM
11.2.1 System architecture
The HFDL system shall consist of one or more ground and
aircraft station sub-systems, which implement the HFDL
protocol (see 11.3). The HFDL system shall also include a
ground management sab-system (see 1 1.4).
11 .2.1.1 AIRCRARA ND GROUND STATION
SUB-SYSTEMS
The HFDL aircraft station sub-system and the HFDL ground
station sub-system shall include the following functions:
a) HF transmission and reception;
b) data modulation and demodulation; and
c) HFDL protocol implementation and frequency selection.
11.2.2 Operational coverage
Frequency assignments for HFDL shall be protected
throughout their designated operational coverage (DOC) area.
Note 1.- Designated opemtional coverage (DOC) areas
may be diflerent from current MWARAs or RDARAs as defined
in Appendix S27 to the ITU Radio Regulations.
4/11/99
No. 74
ANNEX 10 - VOLUME I11
Part I Annex 10 - Aeronautical Tclecommunicarions
Note 2.- Additional co-ordination with ZTU is reqtlired in Table 4-26 for message priorities 7 through 14, shall not
cases where DOC areas are not in conformip with the exceed the values of Table 11-1.
allotment areas specified in the ITU Radio Regulations.
Table 11-1. Transfer delays
11.2.3 Requirements for carriage of
HFDL equipment
Requirements for mandatory carriage of HFDL equipment
shall be made on the basis of regional air navigation
agreements that specify the airspace of operation and the
implementation time-scale.
The agreement above shall provide advance notice of at least
two years for the rnandato~yc arriage of airborne systems. 11.3 HF DATA LINK PROTOCOL
Transit delay
Transfer delay
(95 percentik)
The HFDL protocol shall consist of a physical layer, a link
layer, and a subnetwork layer, as specified below.
Direction PrioriQ Delay
To-aircraft 7 through 14 45 s
.
From-aircraft 7 through 14 60 s
I To-aircraft 11 through 14 90 s
7 through 10 120 s
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