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after detecting the end of transmission. If a valid INFO (P=l)
is received, the response shall be either an RR @=I) or SREJ
(F=l). If a valid INFO (P=O) is received, the response shall be
either an RR (F=O) or S W(F =O).
6.5.3.7.3 Recommendation.- The only time that an RR
or SREJ frame should be transmitted with P=l is when T4
6.5.3.7.4 Unnumbered framec The P bit shall be set to
0 for U1; and DISC frames. The F bit shall be set to 0 for DM
frames. Therefore, a response (e.g. UA) shall not be expected,
and if received, shall be treated as an error.
6.5.3.8 UNNUMBERECDO MMAND
FRAMES COLLISIONS
When a command frame collision occurs, the entity which has
precedence shall discard the received frame from its peer
entity and the peer entity shall respond as if it had never sent
its command frame.
6.5.3.8.1 DLXprocedures. While waiting for a response
to an unnumbered command frame (i.e., F'RMR), a DLE
whose DLS address is lower than its peer DLE shall have
precedence.
6.5.3.8.2 LME procedures. An LME receiving a Broadcast
Handoff shall process it regardless of what XID-CMD it
is waiting for a response. Otherwise, an I h E sending an
XTD-CMD (P=l) shall have precedence over an LME sending
an D-CMD (P=O). Otherwise, an LME whose DLS address
is lower than its peer LME shall have precedence.
6.5.3.9 XIDfrarne. The XZD frame shall be used for the
LME to establish and maintain links as defined in 6.5.4. The
originator of an XID-CMD (P=1) Frame shall retransmit the
XID upon expiration of Timer T3 whenever no response has
been received. The receiving LME shall use the XIID sequence
number and retransmission field to differentiate a
retransmission from a new XID; however, no meaning shall be
attached to a missing sequence number. An LME shall send
the exact same XID-RSP to every retransmission of an
XID-CMD, unless it intends to change the link status via an
XID-CMD (-HO, or -LCR).
6.5.3.10 Broadcast. Only m-CMDs or UIs shall be
broadcast. The P bit shall be set to 0 (no acknowledgement)
for broadcast frames.
Except as noted below, the procedures for information transfer
shall be specified by IS0 4335 and IS0 7809.
6.5.3.11.1 Transmit queue management. When the DLS
sub-layer has frames to transmit, it shall wait for the MAC
sub-layer to authorize transmission. Two transmit queues shall
be maintained, one for supervisory and unnumbered (XU),
FRMR, TEST, DISC, DM, RR, SREJ) frames and the other
for information (INFO and UI). While waiting for
Annex 10 - Aeronautical Telecommunications Volume 111
authorization to transmit, the DLS sub-layer shall update the
transmit queue, eliminating certain frames as specified in
6.5.3.11.1.1 through 6.5.3.11.1.7. If all of the frames on the
DLS transmit queue are eliminated, then the authorization to
transmit shall be ignored.
6.5.3.11.1.1 Eliminate redundant frames. At most one
RR, SREJ, DM, FlUvlR or retransmitted INFO (of a given
sequence number) shall be queued in response to a
transmission.
6.5.3.1 1.1.2 Recommendation.- To eliminate redundant
frames, superseded ,frames in the trunsmit queue should
be deleted (e.g., an INFO queued in response to a TI timeout
and then an SREJ).
6.5.3.11.1.3 Recommendation.- If any INFO frame is
received fronz a peer DLE, the DM sub-layer should update
the N(r) of all numbered frames addressed to that DLE in the
transmit queue, thm improving the probability of the
acknowledgme~zta rriving.
6.5.3.11 -1.4 Recommendation.-- To eliminate unnecessary
retransmissions, if any numbered frame is received from
a peer DLE, all frames in the transmit queue that it
acknowledges should be deleted. If an XID-CMD from a peer
M E with a lower DLS address or an XID-RSP is received
from a peer LME, any XID-CMDs in the transmit queue ,for
that LME should be deleted.
6.5.3.1 1.1.5 Procedures for transmission. Supervisory
frames have higher priority than the information frames, and
so supervisory and unnumbered @ID, FRMR, TEST, DISC,
DM) frames shall be transmitted in preference to information
frames.
6.5.3.11.1.6 Recommendation.- On transmission of an
INFO frame, the DM should also transmit any queued RR so
as to avoid transmitting the RR as a separate frame.
6.5.3.1 1.1.7 Recommendation.- A station receiving a
FRMR, DISC, or DM frame should delete all outstanding
trafic for the translnitting DLE us it would not be accepted if
transmitted.
6.5,3.11 .I .8 Recommendation.- All unicastframes in
the transmit queue should be deleted after the radio
supporting this transmit queue is retuned as the intended
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