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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.
6.5.4.4.6.6 Disconnecting old link. I f the new and old
ground stations are associated with different systems, then the
procedures of 6.5.4.4.6.4 shall be followed. Otherwise, the
aircraft LME shall set Timer TG5 when it receives the
XLD-RSPHO. The ground LME shall set Timer TG5 after it
transmits the XID-RSPHO. Both stations shall continue to
operate on the old link until their respective Timer TG5
expires, after which each will consider the link disconnected
without sending or receiving a DISC.
6.5.4.4.6.7 Exceptional cases. If the ground LME cannot
satisfy the XID-CMD-HO, then it shall transmit an
XE-RSPLCR instead of an XID-RSPHO; the current link
shall not be affected. While waiting for a response to an
XIDCMD-HO, an aircraft LME receiving any unicasted
frame other than a TEST or an XID from any ground station
other than the current station shall retransmit the
XTD-CMD-HO. If Counter N2 is exceeded on the
XID-CMD-BO, the aircraft LME shall attempt to handoff to
another ground station; the current link shall not be affected.
If the aircrdt LME cannot perform the autotune, it shall
transmit an XID-CMD-LCR (P=O); the current link shall not
be affecled. If the parameters in the XID-RSP-HO are not
acceptable to the aircraft LME, then the aircraft LME shall
transmit a DISC to the ground on the new link.
Note.- See 6.5.3.8 on the processing of an XID-CML).
6.5.4.4.7 Aircraft-requested ground-initiated hando# An
aircraft LME shall, not perform this section when its peer LME
does not support handoff initiation. An aircraft LME shall only
6/11/97
No. 72
Part I Annex 10 - Aeronautical Telecommunications
perform this section if the current and proposed ground
stations are both managed by its peer LME.
6.5.4.4.7.1 Aircrafi" action. For an aircraft LME to
request the ground LME to initiate a handoff, it shall send an
XTD-CMD-HO (P=O) addressed to its current or proposed
ground station with the parameters as per Table 6-51. During
this procedure the current link shall not be affected until the
aircraft LME receives an XID-CMD-HO (P=l).
6.5.4.4.7.2 General ground response. If the ground LME
receives the XID-CMD-HO, it shall commence a groundinitiated
handoff from a proposed ground station. The ground
LME shall only transmit the XID-CMD-HO (-1) once per
XID-CMD-HO (P=O) request that it receives.
6.5.4.4.7.3 Exceptional cases. IF the ground system
cannot initiale the handoff, it shall send an XID-CMD-LCR
(P=O); the currcnt link shall not be aFfectcd.
6.5.4.4.7.4 Recommendation.- If Counter N2 is
exceeded for the XIkCMD-HO, the aircraft LME should
attempt to reqbtest to handoff to another station before
disconnecting all links to the ground and restarting link
establishment.
6.5.4.4.8 Ground-based initiated handoff If a ground
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.
621.4~4.8.1 Ground action. To command an aircraft, to
which a link exists, to establish a new link to a proposed
ground station on the same frequency, the ground LME shall
send via that ground station an XID-CMD-HO (P=l) to the
aircraft with parameters as per Table 6-51. If the ground LME
will accept a handoff to other ground stations, the
XID-CMD-HO shall includc the Replacement Ground Station
List parameter specifying the link layer address of those other
stations. Any operating parameters in the XID-CMD-HO
(either modification or informational) shall be valid for the
transmitting station and for all ground stations listed in the
Replacerncnt Ground Station List parameter, except the Airport
Coverage Indication parameter and Nearest Airport parameter
which are only valid for the transmitting ground station.
6.5.4.4.8.2 General aircraft response. The aircraft LME
shall respond by sending an XID-RSP-HO with parameters as
per Table 6-51 to eilher the proposed ground station or to its
preferred ground station if the XtD-CMD-HO included the
Replacement Ground Station List parameter.
6.5.4.4.8.3 Disconnecting old l i d . The aircraft LME
shall set Timer TG5 after it transmits the XIDRSP-HO. The
ground LME shall set Timer TG5 when it receives the
XID-RSP-HO. Although new traffic will be sent over the new
link, the old link shall not be disconnected immediately to
　
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