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to the AES management in the channel status report LDU. shall immediately make available a channel unit serving the
lowest precedence call for the new call, when no channel units
are available, and indicate the availability of the channel unit
4.10.4.4.4 CHANNEL FJEQUENCY MANAGEMENT to the circuit-mode services in the GES.
4.10.4.4.4.1 AES frequency setting 4.10.4.4.6.2 Data versus voice pre-emption
Note.- Prior to log-on, rhe AES will use the R,, channel The GES shall have the capability to reassign spectrum and
frequency from the system table to send the log-on request power resources from circuit-mode services to packet-mode
LIDU to the GES management. services in order to meet packet data service requirements.
4.10.4.4.4.1.1 For the P, R and T channels, the GES
management shall assign the initial P, R and T channel 4.10.4.5 GES SYSTEM BROADCAST
frequencies to the AES (if the Pd/Rd frequency is different
from the P,,JR,, frequencies) by sending P/R channel 4.10.4.5.1 The GES management shall transmit the
control LIDU and T channel control LIDU to the AES after system table and time data to the AES in order to maintain the
the log-on confirm LIDU in response to the received log-on currency of the data and time in the AES.
request LDU.
4.10.4.4.4.1.2 For a C channel, the GES management 4.10.4.5.2 SYSTEM TABLE BROADCAST
shall assign the AES C channel transmitlreceive frequency by
passing the assigned frequencies to the AES in the C channel 4.10.4.5.2.1 The GES management shall transmit the
assignment LIDU transmitted by the circuit-mode services in system table data to the AES by means of one or of the
the GES. following broadcast LIDUs:
4.10.4.4.4.2 AES channel frequency reassignment a) broadcast index;
4.10.4.4.4.2.1 For the P and R channels, the GES b) GES P/R channel advice;
management shall adjust the P/R channel frequencies
previously assigned to the M S by initiating channel c) satellite identification advice;
reassignment procedure as described in 4.10.4.3.6 and sending
the n&ly assigned frequencies in the PI R channel control d) GES beam support advice;
LIDUs following the log-on confirm LIDU.
e) data EIRP table broadcast.
4.10.4.4.4.2.2 For the T channel, the GES management
shall adjust the T channel frequencies by initiating channel
reassignment procedure and transmitting the T channel control 4.10.4.5.2.2 The system table data shall be transmitted in
LIDU, following the log-on confirm LIDU, to the AES. the following two forms:
a) partial sequence containing the most recent updates; and
4.10.4.4.5 CHANNEL INTERFERENCE
MANAGEMENT b) complete sequence containing the full initial search and
regional data update.
The GES management shall maintain one or more reserve
frequencies for each GES in each beam it supports to be used 4.10.4.5.2.3 A partial sequence shall comprise one or
as P, channel and as R, chmel frequencies, in the event more broadcast LDUs described in 4.10.4.5.2.1.
Annex 10 - Aeronautical Telecommunications Volume III
4.10.4.5.2.4 - The complete sequence shall include all the
broadcast LIDUs in 4.10.4.5.2.1. There shall be a complete
sequence for each beam in the satellite service area supporting
a satellite/beam-identifying P,,, channel.
4.10.4.5.2.5 The partial and complete sequence shall each
include one broadcast index LDU.
Note I.- The broadcast index LIDU provides an existence
flag for each LZDtY in the complete sequence.
Note 2.- The GES Psm, and Rs, channel series of the
complete sequence can contain up to 64 L.IDUs because of the
size of the "initial sequence number" field in the broadcast
index LIDU. In case more LlDWs are included in the series,
the second series of the GES Psw, and R,,, channel series is
used.
4.10.4.5.2.6 The GES shall transmit the partial sequence
on all the P channels it supports. In addition, the GES shall
transmit the complete sequence on each satellite/beamidentifying
P,,, channel it supports. Each GES in a satellite
service area shall transmit to each of its logged-on AESs all
partial sequences due to any update made by any GES in the
satellite service area.
4.10.4.5.2.7 The partial sequence shall be transmitted
twice as often as the complete sequence.
4.10.4.5.3 SELECTIVE RELEASE BROADCAST
Note.- The selective release broadcast LTDU is used to
command all logged-on AESs to cease transmission on
spec$ied L-band frequency(ies).
4.10.4.5.3.1 The GES management shall send one or
more selective release broadcast LIDUs to the AES upon
occurrence of either of the following events:
a) request to release.certaitin channels;
b) for circuit-mode calls, if the in-band channel clemTng
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