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Part X Annex 10 - Aeronautical Telecommunications
4.4.5.3 FRAMEFO RMAT
4.4.5.3.1 Unique word. The unique word shall consist of
two identical 44-bit sequences on the I and Q channels of the
A-QPSK signal; 0100 0010 1101 1010 1111 0011 0100 1011
101 1 0001 0001, with the leftmost bit transmitted first.
4.4.5.3.2 Dummy field. Where the channel rates are
implemented as defined in 4.1.3, the number of bits in the
dummy field shall be:
- 62 at 10.5 kbits/s;
- 44 at 21.0 kbits/s; - 37 at 5.25 kbitsls; and
- 32 at 6.0 kbits/s.
The dummy bits shall consist of the sequence 0101 1010 001 I
1100 repeated until the required number of bits is obtained.
4.4.5.3.3 INFORMATION F l E D FOR
CODED CHANNELS
4.4.5.3.3.1 At the channel rate of 21 -0 kbits/s this field
shall contain 10 368 bits which shall be subdivided into 27
interleaver blocks of 384 bits each.
4.4.5.3.3.2 Recommendation.- At the recommended
channel rate of 6.0 kbits/s this fild should contain 2 880 bits
which UIV subdivided into I5 interleaver blocks of 192 bits each.
4.4.5.3.3.3 Information Jield structure including
sub-band data. Prior to scrambling, FEC encoding and interleaving,
the information field shall consist of a fill-in field
followed by 25 alternating sub-band data and transparent data
(voice) subfields as shown in Figure 4-9.
4.4.5.3.3.3.1 At a channel rate of 21.0 kbitsls the fill-in
field shall consist of 84 zeros, each subfield shall contain 12
sub-band data bits and 192 primary bits, and the last 12 bits
of the 25th sub-band data subfield shall be filled with zeros.
4.4.5.3.3.3.2 Recommendation.- At the recommended
channel rate of 6.0 kbits/s the $fill-in Jield should consist of
40 zeros, each subfield should contain 8 sub-band data bits
and 48 primary bits, and the last 8 bits of the 25th sub-band
data subfield should be filled with zeros.
4.4.5.3.3.4 Scrambling. The Standard in 4.4.2.2.5.1 shall
apply-
4.4.5.3.3.5 Forward error correction (FEC) coding. The
Standard in 4.4.2.2.5.2 shall apply.
4.4.5.3.3.6 Interleaving
4.4.5.3.3.6.1 At the channel rate of 21.0 kbitsls the
number of rows in the interleaver shall be 64 transmission bits,
while the number of columns shall be 6.
4.4.5.3.3.6.2 Recommendation.- At the recommended
channel rate qf 6.0 kbits/s the number of' rows in the
interleaver should be 64 transmission bits and the interleaver
columns should be 3.
4.4.5.3.3.6.3 At the transmitter the output of the
convolutional encoder shall be written into the 64-bit columns,
until the specified number of columns are full. The rows shall
then be permuted using the algorithm described in 4.4.2.2.5.3.
4.4.5.3.4 Information field for uncoded chunnels. Where
the channel rates are implemented as defined in 4.1, at the
channel rate of 10.5 kbitsls this field shall contain 5 100 bits
and at the recommended channel rate of 5.25 kbits/s this field
shall contain 2 500 bits.
4.4.5.3.4.1 Information field structure including
sub-band data. Prior to scrambling this field shall be divided
into 25 alternating sub-band data and primary fields as shown
in Figure 4-10. Where the channel rates are implemented as
defined in 4.1.3, at the channel rate of 10.5 kbitsls each
subfield shall contain 12 sub-band data bits and 192 primary
bits; the last 12 bits of the 25th sub-band data subfield shall be
filled with zeros. Where the channel rates are implemented as
defined in 4.1.3, at the channel rate of 5.25 kbits/s each
subfield shall contain 4 sub-band data bits and 96 primary bits;
the last 4 bits of the 25th sub-band data subfield shall be filled
with zeros.
Note.- hterleaving is not applicable at the channel rates
of 10.5 and 5.25 kbits/. because the data is not forward error
correction coded at these rates.
4.4.5.4 Performance. The C channel physical layer shall
be configured and operated such that the average bit error rate
is or less after descrambling.
Note.- GES measureinents of received BER permit GES
commands to the AES for adjustment of the .4ES transmined
powel: The GES also receives performancedata measurement
results ntade by the AES to enable GES output power
udjusmettts.
4.5 LINK LAYER P CHANNEL
AND R CHANNEL PROTOCOLS
4.5.1 General
Note.- The AMSS protocols are defined in terms of the
OSI layered reference nzodel. Section 4.5 defines the functional
requirements ofthe link layer for P and R channels to tran$er
user data and signalling between the AES and the GES.
4.5.1.1 For each AES and GES, the link layer shall
interface to the following:
Annex 10 - Aeronautical Telecommunications Volume IZI
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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