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identified for the GES rejection of an AES log-on request. A
list of these reasons is given in Annex 10, Volume 111,
Appendix 3 to Chapter 4. No specific AES responses
corresponding to the specified rejection reasons have been
given in the AMSS SARPs. Such responses are
implementation dependent. However, the AMSS SARPs
further classify the rejection reasons into three categories:
permanent unavailability, temporary unavailability, and invalid
parameters. The response of the AES management to a
rejection reason could be defined in accordance with the
category of the rejection reason in the following manner:
permanent unavailability: cease further log-on attempts to
the same GES;
temporitIy unavailability: reattempt log on to the same GES
only after a suitable period of time, or after attempting to
log on to other suitable GES;
invalid parameters: reattempt log on to the same GES, only
with different parameters.
9.3.2.3 Universal tinu btvadcast
Some applications on the aircraft may need to be synchronized
with the counterpart applications on the ground. The AMSS
SAWS contain recommendations for support of a time
synchronization facility at the AES and the GES. Thus, for
interoperab~lity consideration, a 'universal time signal unit
(Annex 10, Nlume IH, Part I, Appendix 2 to Chapter 4, Figure
A2-35) containing the current time to the nearest second,
synchronized to the UTC standard has been defined in the
AMSS SAWS. Upon receipt of a universal time SU from the
GES, the AES may provide the received time information to
the appropriate applications on the aircraft. The method
selected by the AES to provide this time information to an
application is implementation dependent.
9.3.2.4 User comma&
9.3.2.4.1 The AMSS SARPs specify the AES responses
to a minimum set of commands intended to influence some of
the AES operations. Such commands may be initiated either
prior to (Annex 10, Volume III, Part I, Chapter 4,4.9.3.3.3.1)
or after (Annex 10, Volume HI, Part I, Chapter 4, 4.9.3.3.4.2)
the AES log-on. Neither the sources nor the formats of such
commands are specified in the AMSS SARPs. Such sources
may be internal or external to the AES and operating in
accordance with some stimulus criteria to satisfy a particular
user requirement, such as continuity of service. For example,
a stimulus criterion to invoke a beam-to-beam handover could
be based on the knowledge of the beam pattern of a given
satellite and the position and heading of the aircraft. The
formats of the handover commands are implementation
dependent.
9.3.2.4.2 Hnndover commands. The handover commands
specified in the AMSS SARPs are intended to enable the AES
user to alter the AES log-on conditions in various: ways, as
deemed suitable by the user.
9.3.2.4.2.1 A GESito-CfES handover comm.md could be
issued by the AES user in otdet to:.
a) renew the log-on to the same GES but through a
different spot beam;
b) to switch the log-on to a different GES in the same
satellite service area, either through the same or a
different spot beam.
Such command may have to specify the GES fD and spot
ham ID when those Ds are different than the current values.
Circuit-mode calls in a Lwel-4 AES (multiple transmit and
receive channel units) are not effected by the execution of this.
command. Level3 AES operation is as specified in Annex 10,
Volume III, Part I, Chapter 4, 4.9.3.3.4.2 b).
9.3.2.4.2.2 A sateUite-to-~ate11ite handover command
could be issued by the AES user in order to switch the AES
log-on u, a new GES within the service area of another
satellite. Any circuit-mode call established through the current
satellite will have to be forcibly terminated after a fixed period
of time prior to switching to the new satellite. In the AMSS
SARPs, this period of time is set to 3 minutes. If the AES was
unable to tune to any of the listed satelliteheam-identifying
P, channels of the new satellite, the AES may revert back to
the previous satellite or any other satellite in view.
9.3.2.5.1 P channel loss/degradation declaration is
conveyed to the AES management in the form of an indication
from the AES physical layer (P channel receiver). The criteria
on which such declaration is based m given in 4.1.3 of
Attachment A. If the P channel Loss or degradation is caused
by the aircraft flying out of the selected beam coverage, the P
channel loss/degradation declaration will cause the AES
management to search for a new GES, within the same or a
different satellite service ma, md log-on to it. However, the
losd&gradation of the P channel would cause an undesirable
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