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时间:2010-07-21 23:04来源:蓝天飞行翻译 作者:admin
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shall process received broadcast m-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 the new link having the same
parameters as the old link (as modified by the parameters in
the broadcast XD). The old link shall be disconnected
immediately.
6.5.4.4.10.2.1 The Broadcast Connection parameter shall
include the subnetwork connection information (i.e. the M/I
and LC1 subficlds) for only those subnctwork connections
bctween the aircraft DTE and the peer ground DTEs that the
ground LME maintained. Aircraft LMEs supporting broadcast
subnctwork connection management shall process the rcrnainder
of the Broadcast Connection parameter to determine which
subnetwork conncctions the gronnd LME maintained. For
those subnetwork connections associated with the logical
cllannels on thc old link that the ground LME maintained, the
aircraft DTE shall consider as if thc CALL REQUEST and
CALL CONFIRMATION sent on the old link were rcsent on
the new link (except that the MJI bit in the Broadcast
Connection parameter shall supersede the value in the previous
CALL CONF!RMATION). At this point the aircxttfl DTE,
ground DCE, and ground DTE shall be initialized. If the
Broadcast Connection parameter indicates that the ground was
not able to maintain a subnetwork connection (i.e. a particulsr
LC1 is not mentioned in the Broadcast Connection parameter),
the aircraft shall explicitly establish this subnetwork
connection as per 6.6.6.3.3.1.
6.5.4.4.10.3 Exceptional cases. If the aircraft EME does
not support broadcast recovery, but the ground LME
performed a broadcast link recovery for it, then the aircraft
LME shall perform either an air-initiated link handoff, (if the
aircraft LME supports same) or request a link handoff. If the
aircraft LME finds the new ground station unazceptable, it
shall pcrform an air-initiated handoff (if thc aircraft 1,ME
supports same) or request a link handofl. If the Ground Station
Address Filter parameter does not equal the DLS address of a
link that the aircraft LME has or if no aircraft idenlifier
subfield in a Broadcast Connection parameter equals its
aircraft address, the aircraft LhaE shall not process the ground
requested brodcast handoff. If the aircraft EME supports
broadcast link hand~ffs but does not support broadcast
YXIIOO
No. 75
Purl I Annex 10 - Aeronautical Telecomt~unica~ns
subnetwork connection management and the Broadcast
Connection ficld is implemented as per Table 6-41, the aircraft
LME shall explicitly establish its subnetwork connections. If
the Broadcast Connection parameter indicates that a
subnetwork connection was maintained, but the aircraft LME
docs not recognize that subnetwork connection, then the
aircraft DTE shall transmit a CLEAR REQUEST for each
unrecognized subnetwork connection.
6.5.4.4.11 Gmund-bused commanded outotune. This
section summarizes the autotune details found in 6.5.4.4.3,
6.5.4.4.5, and 6.5.4.4.8.
6.5.4.4.1 1.1 Ground action. To command an aircraft LME
to handoff to a ground station on a different frequency, the
ground LME shall include the Autotune and Replacement
Ground Station List parameters in an XID it sends during a
link establishment or handoff procedure.
6.5.4.4.1 1.2 General aircraji response. On receipt of an
XID commanding an autotune, the aircraft LME shall, retune
the aircraft radio to he new frequency and commence an
aircraft-initiated handoff to the chosen ground station.
6.5.4.4.12.3 Exceptional cases. If the. responding LME
can 1101 support the expedited subnetwork connection
establishment or maintenance but can support the link
establishment or handoff, it shall respond with X I D S P with
the Connection Managanent "v" bit set to 0 and shall not
include the Expedited Subnetwork Connection parameters in
the XID-RSP. If T3min expires, the responding LME shall
include all responses (i.e. CALL COICcTlRMATION or
CLEAR REQUEST) that it has received up to that point in the
XID-RSp Any late responses from respective Dm($s)h all be
sen1 to the initiating LME in mi0 frames.
Note.- All XJD-CMD retrunsmissions will cause the
responding LME to respond with the same XID_RSP without
 
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