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AMSS SARPs in order to enforce the priority and pre-emption
statement of Annex 10, Volume 111, Part I, Chapter 4, 4.8.3.2
in the AES. In this regard, the circuit-mode services will only
request the assignment of a transmitlreceive channel unit pair
from the AES management if, and only if, there are either
sufficient resources available or at least one of the circuitmode
calls in progress has at a Q number strictly lower than
the Q number of the call being established. In the latter case,
the AES management will make available the channel units
being used by the call in progress to support the call being
established.
9.3.3.2 h v e l 3 AES voice/data
arbitration
In a Level 3 AES, a single transmit channel unit is shmd
among the R, T and C channels. The arbitration between the
R channel and the T channel is resolved in the AMSS SAWS
by considering that the T channel signal unit (SU)
transmissions, regardless of the Q number of the SUs, have
precedence over the SUs transmission on the R channel.
However, a minimum number of "gaps" in the T channel slot
reservations to a particular aircraft are required to ensure that
the R channel transmission are not totally blocked (Annex 10,
Volume 111, Part I, Chapter 4, 4.6.5.3.3). Arbitration between
the C channel and the R or T channels is accomplished
according to the priorities of the transactions on these
channels. The specific requirements for such arbitration are
given in Annex 10, Volume 111, Part I, Chapter 4, 4.9.3.4.1.4.
It should be noted that the AMSS SARPs do not require that
an established voice call be terminated if the transmission of
a higher precedence data message is required; rather, such
action is optional. An alternative scheme allowed by the
AMSS SARPs would be to cease transmission on the
C channel long enough to transmit any higher precedence
signal units in the AES link layer and then reassign the
transmit channel unit to the C channel.
assigned C channels, to update the system table and time
information in the AES and to verify the operational status of
its logged-on AESs.
10.2 GES management architecture
10.2.1 SATELLITE SERVICE AREA
A service area of a satellite is defined as the satellite coverage
area within which a satellite provider provides services.
Different satellites can have overlapping satellite service areas.
10.2.2 SATELLITES YSTEM CONFIGURATlONS
The following are the three satellite system configurations:
a) Satellite with global beam only. In this configuration,
there is only one beam per satellite. This beam is
referred to as a global beam. In this configuration, two
GESs may be required per satellite in a satellite
service area to account for two satellite-identifying P,,,
' channels for satellite identification.
b) Satellite with global beam and spot beams. In this
configuration, a satellite supports multiple beams with
some beams enclosed within another beam. The beams
enclosed within a beam are called spot beams and the
enclosing beam is referred to as a global beam. In this
configuration, two GESs may be required per satellite
in a satellite service area to account for two satelliteidentifying
P,,, channels for satellite identification.
The satellite-identifying P,,, channels for satellite
identification in this configuration are transmitted in
the global beam.
10. GROUND EARTH STATION
(GES) MANAGEMENT
10.1 General
10.1.1 Ground earth station (GES) management functions
specified in Annex 10, Volume 111, Part I, Chapter 4,
4.10 are mandatory for each GES implementation. The GES
management includes functions to manage the AES log-on to
a GES, to control the assignment of P, R and T channels for 10.2.3 GES CAPABILITY
data and signalling transfer, to reassign new channels on
detection of an excess loading on a channel, to assign C At a minimum, the GES should be capable of operating
channel frequencies on-demand, to control the power of the through a space segment with a Level 4 AES. This implies
c) Satellite with spot bwms only. In this configuration,
the satellite supports spot beams only, with no global
beam. In order that a satellitelbeam-identifying P,,,
channel is available throughout a satellite service area
for satellite and beam identification, at least one P,,,
channel frequencies must be transmitted in each spot
beam in the satellite service area. A GES in a satellite
service area can support more than one spot beam by
transmitting and receiving a unique set of frequencies
in each spot beam.
Atluchmsnt A to Part I Annex 10 - Aeronautical Telecommutrications
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