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services, designated as direct link service (DLS) and reliable
link service (RLS).
immediately after it is assigned. For RLS, the reference
number shall be released after the GES sends a transmission
status indication LIDU (Table 4-25) to the link service user in
4.5.6.2 DLS shall be a linklayer service in which the SUs the GES. ne GES shall not reassign a released
shall be transmitted to the peer link layer without making any number until all the reference numbers that were available
provision for identification and rcrransmission of any lost SUs.
before its release have been assigned, in accordance with
4.5.7.2.2, the only exception to that shall be for a reference
Note.- DLS is. only nvailable to AES/GES management
number that was assigned to a DL$ LIDU mapping into an
functions rrnd cixuit-mode services. LSU, which may be immediately reassigned to another DLS
LIDU mapping into an LSU. 4.5.6.3 RLS shall be a linlr-layer service that provides for
the identification and retransmission of any lost SUs. 4.5.7.2.4 After the assignment of a reference number to
the LlDU or upon receipt of circuit-mode LIDU, an SU set
shall be generated according to 4.5.3.2.3. Among all the SUs
awaiting transmission, the oldest of the SUs with the highest
4.5.7 I' channel protocol Q number shall always be transmitted first. The ISU or the
RTX SU of an SU set shall be transmitted before the SSUs,
Note.- In this subsection, the use ofthe tenns "AES" and and the SSUs shall be transmitted in the descending order of
"GES" refer to the link layer functiom for the P chrrnnel their sequence numbers (Appendix 3 to Chapter 4, Item 59).
protocol within the AES and the GES. After the transmission of the complete SU set, the GES shall
do the following:
4.5.7.2.4.1 For RLS:
a) If a P channel acknowledgement (PACK) SU (Appen-
The link layer functions for the P channel shall be as defined dix 2 to Chapter 4, Figure A2-49) indicating no error in
in 4.5.7.2 and 4.5,7.3. the SU set is received from the AES, the GES shall send
a transmission status indication LIDU indicating success
(Table 4-25) to the link service user in the GES.
4.5.7.2 GROUNDEA RTH STATION (GES)
4.5.7.2.1 Upon receipt of an UDU, the GES shall assign
available (not currently assigned to an LIDU with the same
number) refcrence number to it whenever this can be done
in accordance with 4.5.7.2.2; however, the GES shall not
assign a reference number to LIDUs received from the circuitmode
services and to system table broadcast LmUs received
from the GES management. If a reference number cannot be
assigned to an LIDU, the LIDU shall be stored until one is
assigned to it.
Note.- The circuit-made LIDUS ure assigned application
refellencc numbers by the circr~ir-modes ervices.
b) If a PACK SU (Appendix 2 to Chapter 4, Figure A2-49)
indicating missing SUs in the SU set is received from
the AES and if another PACK SU of the PACK SU set
is not rcceived within tG2 seconds (Appendix 4 to
Chapter 4) from the time the last PACK SU of the PACK
SU set was received, or if no morc PACK SUs
identifying missing SUs are expected, the GES shall
transmit a retransmission SU set. The retransmission SU
set shall comprise a retransmission header (RTX) SU
(Appendix 2 to Chapter 4, Figure A2-41) followed by
the missing SUs identified in the received PACK SUs of
the PACK SU sct. The GES shall then proceed as in
4.5.7.2.4.1: however, if a PACK SU indicating missing
Annex 10 - Aeronautical Telecommunica~ons Volume ZIZ
SUs in the SU set is received from the AES before the
complete retransmission SU set has been transmitted,
the GES shall discard the received PACK SU.
c) If a PACK SU (Appendix 2 to Chapter 4, Figure A2-49)
requesting a complete retransmission of the SU set is
received from the AES, the GES shall retransmit the
entire SU set as a sequence of an ISU and SSUs. The
GES shall then proceed as in 4.5.7.2.4.1
d) If no PACK SU associated with the SU set is received
from the AES within tG1 seconds (Appendix 4 to
Chapter 4) from the time the last SSU of the SU set
(original or retransmitted) was transmitted, the GES
shall transmit a request for acknowledgement (RQA) SU
(Appendix 2 to Chapter 4, Figure A2-27) to the AES.
The GES shall transmit the RQA SU every tG1 seconds
from the timc the last RQA SU was sent, until a
response is received from the AES, or until the number
of times the RQA SU was sent equals five. If tGl
seconds elapse after the fifth retransmission of the RQA
SU without receiving any corresponding PACK SU from
the AES, the GES shall send a transmission status
indication LDU indicating failure (Table 4-25) to the
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