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allow any old trdfic to be delivered.
6.5.4.4.8.4 Exceptional cases. If the aircraft LME cannot
accept the handoff request, it shall respond with an
XID-RSPLCR; the current link shall not be affected. While
waiting for a response to an XlD-CMD-IIO, a ground LME
receiving any unicasted frame other than a TEST or an XID
from the aircrdt shall retransmit the XID-CMD-HO. If the
parameters in thc XID-KSP-HO are not acceptable to the
ground LME, then the ground LME shall transmit a DISC to
the aircraft on the new link.
Note.- See 6.5.3.8 on the processing of an XID-CMD.
6.5.4.4.8.5 Recornmendation.- I f Counter N2 is
exceeded for the XID-CMD-HO, the ground LME should
attempt to handoff via anothr station before disconnecting all
links to the aircraft.
6.5.4.4.9 Ground-based requested aircraft-initiated
handog A ground EME shall not perform this section with
aircraft that do not support handoff initiation.
6.5.4.4.9.1 Ground uction. For the ground LME to
request an aircraft to initiate a handoff, it shall send an
XZD-CMD-HO (P=O) on the current link with parameters as
per Table 6-5 1. The parameters in the XID (both modification
and informational) are valid for all ground stations listed in the
Replacement Ground Station List. It shall only include
operational parameters if it also includes the Replacement
Ground Station List parameter. If the Autotune parameter is
included, then the Replacement Ground Station List parameter
shall apply to the new frequency.
6.5.4.4.9.2 General aircraft response. If the aircraft
LME receives the XID-CMD-HO, it shall commence an
aircraft-initiated handoff to a ground station, preferably one
listed in the Replacement Ground Station List parameter.
Note.- See 6.5.3.8 on the processing of an XnCMD.
6.5.4.4.9.3 Exceptional cases. If the aircraft LME cannot
initiate the handoff, it shall send an XID-CMD-LCR (P=O);
the current link shall not be affected. If the Autotune
parameter is included in the XlD-CMD-HO (P=O), the aircraft
LME shall retransmit on the new frequency the
XID-CMD-HO (P=l) using the normal retransmission procedures;
otherwise, it shall only transmit the XID-CMD-HO
(P=l) once per received XID-CMD-HO (P=O).
6.5.4.4.9.4 Recommendation.- If Counter N2is
exceeded for the X Z D - C W O , the ground LME should
attempt to request a handoff via another station before
disconnecting all links to the aircraft.
6.5.4.4.10 Ground-based requested broadcast hand08
I f the ground LME broadcasts link handoffs then it shall set
the "b," bit in the AVLC options parameter to I ; otherwise, it
shall set the "b," bit to 0. If the ground LME supports broadcast
subnetwork connection handoff, the ground LME shall
6/11/97
No. 72
Annex 10 - Aeronautical Telecommunications Volume III
also support broadcast link handoffs and shall set the "b," and
"b," bits in the AVLC options parameter to 1; otherwise, it
shall set the "b," bit to 0.
6.5.4.4.10.1 Ground action. If the ground LME supports
broadcast link handoffs, for each aircraft that indicates it
supports broadcast link handoff, the ground LME shall confirm
the link handoff by including the Broadcast Connection
parameter per Table 6-51. If the ground LME supports
broadcast subnetwork connection management, for each
aircraft that indicates it support broadcast subnetwork
connection management, the ground LME shall confirm the
link handoff and the subnetwork connection maintenance by
including the Broadcast Connection parameter per Table 651.
6.5.4.4.10.2 Aircrafi response. The LME in each aircraft
shall process received broadcast XID-CMD-HO (P=O) and
determine if the ground LME had performed a broadcast link
recovery (and possibly an expedited subnetwork recovery) for
it. It shall do this by verifying that the Ground Station Address
Filter parameter contains the DLS address of the ground
station that it is connected to and that a Broadcast Connection
parameter exists containing its aircraft address. Aircraft LMEs
supporting broadcast recovery shall consider that a link
handoff has occurred with thc new link having the same
parameters as the old link (as modified by thc parameters in
the broadcast XID). The old link shall be disconnected
immediately.
6.5.4.4.1 0.2.1 The Broadcast Connection parameter shall
include the subnetwork connection information (i.e. the MI1
and LC1 subfields) for only those subnetwork connections
between the aircrdt DTE and the peer ground DTEs that the
ground LME maintained. Aircraft LMEs supporting broadcast
subnetwork connection management shall process the
　
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