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4 Outgoing INMARSAT aeronautical logic procedures (Ground-to-air calls)
Figure 2/Q.1152 contains the procedures for the outgoing INMARSAT aeronautical signalling
system.
This description only includes the aspects of the INMARSAT aeronautical system which have to be
implemented for interworking purposes. Internal procedures, such as those required
for setting up and clearing satellite channels are not shown. This also applies to pre-emption procedures for assigning channels to distress calls.
The following details should be noted:
4.1 The outgoing INMARSAT procedure receives the calling party indicator, and address digits from
the interworking process. It determines whether the addressed AES is an authorized
user and if it is logged on in the same satellite region. BITE 15 is returned to the
terrestrial network if the dialled AES number is invalid.
4.2 The MSSC attempts to assign a satellite channel to the call, and tests for continuity of the
channel. National network congestion (BITE 12) signal is returned if no channel is
available. Appropriate signals are returned to signify continuity failure and AES busy
conditions.
4.3 Answer signal is returned when the connect message is received from the AES.
4.4 The call is cleared down in the usual manner, on receipt of either clear forward from the
interworking process, or channel release from the AES.
1 Fascicle VI.14 - Rec. Q.1152
wNotew - Number valid ? means is the AES in the region of the calling GES; i.e. logged on the same
satellite.
FIGURE 2/Q.1152 (sheet 1 of 2)
Logic procedures for outgoing INMARSAT aeronautical signalling
(ground-to-air calls)
Fascicle VI.14 - Rec. Q.1152 2
FIGURE 2/Q.1152 (sheet 2 of 2)
Logic procedures for outgoing INMARSAT aeronautical signalling
(ground-to-air calls)
3 Fascicle VI.14 - Rec. Q.1152
5 Interworking of INMARSAT aeronautical signalling system with itself
Figure 3/Q.1152 contains the procedures for interworking between the incoming and outgoing
procedures of the INMARSAT aeronautical system. These procedures may also apply for
interworking between INMARSAT aeronautical and the Standard-A and Standard-B systems.
The following details should be noted:
5.1 The outgoing INMARSAT aeronautical logic process is activated after receipt of the calling
party category information, indicating whether the call is ordinary or priority.
5.2 The called party address, excluding the INMARSAT country code, is transferred to the outgoing
process. The process returns to idle on receipt of any unsuccessful BITE or the clear
forward FITE.
5.3 The call is cleared as normal, on either clearforward FITE or clearback BITE signals.
5.4 The interworking procedure supervises the answer time (timer t1). The value of the timer is as
follows:
t1 = 2 to 4 minutes, as per Recommendation Q.118, 4.3.1.
Fascicle VI.14 - Rec. Q.1152 4
FIGURE 3/Q.1152 (sheet 1 of 2)
Interworking of INMARSAT aeronautical system with itself
5 Fascicle VI.14 - Rec. Q.1152
FIGURE 3/Q.1152 (sheet 2 of 2)
Interworking of INMARSAT aeronautical system with itself
Fascicle VI.14 - Rec. Q.1152 6
6 Interworking of incoming INMARSAT aeronautical to Signalling System R2
6.1 Figure 4/Q.1152 contains the procedures for interworking of INMARSAT aeronautical signalling
system to Signalling System R2.
6.2 The interworking procedure supervises the answer time and the clearback time, with timers t1
and t2 respectively. The values of the timers are as follows:
t1 = 2 to 4 minutes, as per Recommendation Q.118, 4.3.1
t2 = 1 to 2 minutes, as per Recommendation Q.118, 4.3.2
7 Interworking of Signalling System R2 to outgoing INMARSAT aeronautical
7.1 Figure 5/Q.1152 contains the procedures for interworking of Signalling System R2 to INMARSAT
aeronautical signalling system.
7.2 The ringing tone towards the calling subscriber of the fixed network is initiated by the
interworking procedure. The tone should have characteristics in accordance with
Recommendation Q.35.
8 Interworking of incoming INMARSAT aeronautical to Signalling System No. 7 (TUP)
Figure 6/Q.1152 contains the procedures for interworking of INMARSAT aeronautical signalling
system to Signalling System No. 7 (TUP).
The following details should be noted:
8.1 The outgoing Signalling System No. 7 (TUP) is activated only after receipt of calling party
category information.
8.2 Signals to inform whether continuity checking is required on the terrestrial link, whether an
incoming half-echo suppressor should be inserted, and whether country code digits
will be sent along with the called party address, are sent to the ISC. The ISC is also
informed that continuity has been proven on the satellite link.
8.3 All address-complete backward signals are transferred through to the outgoing aeronautical
procedure. The charge related information is interpreted and used by the MSSC for
billing purposes, and a simple address complete message is sent to the AES.
8.4 All unsuccessful call indications received from the ISC are relayed to the INMARSAT system, by
means of the call attempt result message with the cause value set appropriately.
8.5 Charge information contained in the answer message is again used by the MSSC for billing
purposes.
8.6 Answer and clearback supervision is done by the MSSC with timers t1 and t2 respectively. The
values of the timers are as follows:
t1 = 2 to 4 minutes (as per Recommendation Q.118, 4.3.1)
t2 = 1 to 2 minutes (as per Recommendation Q.118, 4.3.2)
7 Fascicle VI.14 - Rec. Q.1152
FIGURE 4/Q.1152 (sheet 1 of 3)
Interworking of INMARSAT aeronautical system to Signalling System R2
Fascicle VI.14 - Rec. Q.1152 8
FIGURE 4/Q.1152 (sheet 2 of 3)
Interworking of INMARSAT aeronautical system to Signalling System R2
9 Fascicle VI.14 - Rec. Q.1152
FIGURE 4/Q.1152 (sheet 3 of 3)
Interworking of INMARSAT aeronautical system to Signalling System R2
Fascicle VI.14 - Rec. Q.1152 10
FIGURE 5/Q.1152 (sheet 1 of 2)
Interworking of Signalling System R2 to INMARSAT aeronautical system
11 Fascicle VI.14 - Rec. Q.1152
FIGURE 5/Q.1152 (sheet 2 of 2)
Interworking of Signalling System R2 to INMARSAT aeronautical system
Fascicle VI.14 - Rec. Q.1152 12
FIGURE 6/Q.1152 (sheet 1 of 3)
Interworking of INMARSAT aeronautical system to Signalling System No. 7 TUP
13 Fascicle VI.14 - Rec. Q.1152
FIGURE 6/Q.1152 (sheet 2 of 3)
Interworking of INMARSAT aeronautical system to Signalling System No. 7 TUP
Fascicle VI.14 - Rec. Q.1152 14
FIGURE 6/Q.1152 (sheet 3 of 3)
Interworking of INMARSAT aeronautical system to Signalling System No. 7 TUP
15 Fascicle VI.14 - Rec. Q.1152
9 Interworking of Signalling System No. 7 (TUP) to outgoing INMARSAT aeronautical
Figure 7/Q.1152 contains the procedures for interworking of Signalling System No. 7 (TUP) to
INMARSAT aeronautical signalling system.
The following details should be noted:
9.1 Calling party category information indicating the nature and priority of the call, is
transferred through to the aeronautical system. The operator language indicator is
interpreted and used by the MSSC.
9.2 The entire called party address, except the country code digits, are transferred through to the
aeronautical system. The outgoing aeronautical logic process determines the validity
of the addressed AES, and returns an unsucessful call indication if necessary.
9.3 The call may also be aborted if:
- no satellite voice channels are available;
- the addressed AES subscriber is busy;
- the continuity check is unsuccessful.
9.4 The MSSC returns audible ring tone, as per provisions in Recommendation Q.35, to the
terrestrial network. The tone is applied on receipt of the address complete message
from the AES, and removed upon receipt of the connect message.
10 Interworking of incoming INMARSAT aeronautical to Signalling System No. 5
Figure 8/Q.1152 contains the procedures for interworking of INMARSAT aeronautical signalling
system to Signalling System No. 5.
10.1 The outgoing Signalling System No. 5 procedure is activated after receipt of the calling party
category information, in the access request message from the AES.
10.2 Either KP2 or KP1 signal is sent by the MSSC, depending on whether the country code is to be
outpulsed or not, respectively.
10.3 The artificial "send-finished" signal, received from the outgoing Signalling System No. 5
procedure is interpreted as an address complete condition to convey back to the AES.
10.4 The "busy-flash" signal (unsuccessful call) received from the terrestrial network is
transferred to the AES by means of the call attempt result message.
10.5 Answer and clearback timeout supervision is done by the MSSC, with timers t1 and t2,
respectively. The values of the timers are as follows:
t1 = 2 to 4 minutes (as per Recommendation Q.118, 4.3.1)
t2 = 1 to 2 minutes (as per Recommendation Q.118, 4.3.2)
Fascicle VI.14 - Rec. Q.1152 16
FIGURE 7/Q.1152 (sheet 1 of 2)
Interworking of Signalling System No. 7 TUP to INMARSAT aeronautical system
17 Fascicle VI.14 - Rec. Q.1152
FIGURE 7/Q.1152 (sheet 2 of 2)
Interworking of Signalling System No. 7 TUP to INMARSAT aeronautical system
Fascicle VI.14 - Rec. Q.1152 18
FIGURE 8/Q.1152 (sheet 1 of 3)
Interworking of INMARSAT aeronautical system to Signalling System No. 5
19 Fascicle VI.14 - Rec. Q.1152
FIGURE 8/Q.1152 (sheet 2 of 3)
Interworking of INMARSAT aeronautical system to Signalling System No. 5
Fascicle VI.14 - Rec. Q.1152 20
FIGURE 8/Q.1152 (sheet 3 of 3)
Interworking of INMARSAT aeronautical system to Signalling System No. 5
21 Fascicle VI.14 - Rec. Q.1152
11 Interworking of Signalling System No. 5 to outgoing INMARSAT aeronautical
Figure 9/Q.1152 contains the procedures for interworking of Signalling System No. 5 INMARSAT
aeronautical signalling system.
The following details should be noted:
11.1 The KP2 or KP1 signal is received from the MSSC, depending on whether the country code is to be
expected along with the called party address or not, respectively.
11.2 The "busy-flash" signal is sent to the ISC if the call cannot be completed for any of the
following reasons:
- called AES subscriber is busy;
- no satellite channel is available;
- the continuity check is unsuccessful.
The special information tone is sent back to the ISC, if the call is unsuccessful for any other
reasons.
11.3 Answer and clearback signals received from the AES are conveyed through to the terrestrial
network as soon as they are received, and there is no timeout supervision required.
wAddendumw - A recent change in the INMARSAT signalling system definition allows cause
information to be carried in the channel release signal, thereby making it
unnecessary to send the call attempt result signal for unsuccessful calls. The interworking
procedures in this Recommendation do not reflect this change.
Fascicle VI.14 - Rec. Q.1152 22
FIGURE 9/Q.1152 (sheet 1 of 2)
Interworking of Signalling System No. 5 to INMARSAT aeronautical system
23 Fascicle VI.14 - Rec. Q.1152
FIGURE 9/Q.1152 (sheet 2 of 2)
Interworking of Signalling System No. 5 to INMARSAT aeronautical system
Fascicle VI.14 - Rec. Q.1152 24
25 Fascicle VI.14 - Rec. Q.1152
