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link using the operating parameters specified in the
XID-RSPLE. If the XLD_RSP-LE does not include the Autotune
parameter, the ground LME shall include the Replacement
Ground Station List parameter if it wishes to indicate the
ground stations which can be reached on the current frequency
using the same operating parameters as the transmitting
station.
6.5.4.4.4.3 Exceptional cases. If an LME receiving the
XID-CMD-LIZ cannot establish the link with the sending
LME, then it shall transmit an XID-RSPLCR (F=l) instead
of an XI-SP-LE (F=l). If the parameters in the
XID-RSPLE from the ground LME are not acceptable to the
aircraft LME, then the aircraft LME shall transmit a DISC to
the ground. If the Autotune parameter is included in the
XID-RSPLE and the aircrdt LLME is unable to perform the
autotune, then thc aircraft LME shall respond with an
XID-CMILCR (P=O); the link established on the current
frequency shall not be afkcted. While waiting for a response
to an XU-CMD-LE, an aircraft LME receiving any unicasted
frame other than a TEST or an shall retransmit the
XTDCMD-LE instead 0% transmitting a DM.
-6/11/97
No. 72
Annex 10 - Aeronautical Telecornmunicati~ns Volume 111
Note.- See 6.5.3.8 on the processing of an XIRCMD.
6.5.4.4.5 Link parameter modification
6.5.4.4.5.1 Ground-based initiation. The ground LME
shall request a modification of an existing link connection's
parameters by sending an XU-CMD-LPM (P=l) to the
aircraft LME containing the pararneters as per Table 6-51.
6.5.4.4.5.2 General aircraft response. The aircraft LME
shall acknowledge with an XID-RSPCPM containing the
parameters as per Table 6-51.
6.5.4.4.5.3 Recommendation.- If Counter N2 is
exceeded for the XID-CMD-LPM, the ground LME should
attempt to handoff via another station before disconnecting the
link to the aircruj?.
6.5.4.4.6 Aircrafr-initiated hand08 If an aircraft LME
implements this section, then it shall set the "i" bit in the
AVLC Specific Options parameter to 1; otherwise, it shall set
the "i" bit to 0.
6.5 -4.4.6.1 Aircraft hand08 Once the aircraft LME has
established a link to a ground station, it shall monitor the VHF
signal quality on the link and the transmissions of the other
ground stations. The aircraft LME shall establish a link to a
new ground station if any of the following events occur:
a) the VHF signal quality on the current link is poor and
the signal quality of another ground station is
significantly better;
b) Counter N2 is exceeded on any frame sent to the
current ground station;
c) Timer TG2 cxpires for thc current link; or
d) Timer TM2 expires. In this case, the aircraft LME
shall autonomously tune to an alternate frequency
(provided in a frequency support list) before initiating
the handoff.
6.5.4.4.6.2 Site selection preference. From among those
ground stations with acceptable link quality, the aircraft LME
shall prefer to handoff to a ground station which indicates (in
the GSIP) accessibility to thc air-ground router(s) to which the
aircraft DTB has subnetwork connections.
6.5.4.4.6.3 Recommendation.- If an aircrafr has
commenced approach to its destination airpon and its current
link is with a grozlnd station thut does not offer service at that
airport, it should handoff to a gmund station which indicates
in its Airport Coverage Indication parameter that it offers
service at thut airport.
6.5.4.4.6.4 hateraction of LMEs. When en aircraft VME
hands off from a ground station in one ground-based system
(and thus associated with one LME) to a ground station in
another ground-based system (and thus associated with a
different LME in the aircraft), the new LME shall use the link
establishmcnt procedures and the old LME shall send a DISC
when directed by the VME.
Note.- Optimally the old link should not be disconnected
until after the new link is capable of carrying application data.
However this is outside the scope of these SARPs.
6.5.4.4.6.5 Generalground response. If the ground LME
receives the XIl-CMD-HO, it shall confirm link handoff by
sending an XID-RSP-HO frame containing the parameters as
per Table 6-51. The ground LME shall include in the
XD-RSP-HO the optional parameters for which it is not
using the default values. If the XID-RSP-HO includes the
Autotune parameter, then the Replacement Ground Station List
parameter shall be included to indicate the ground stations
with which the aircraft LME can establish a new link on the
new frequency, using the operating parameters specified in the
XID_RSP-HO. If the XID-RSPHO does not include the
　
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