Zte ZXG10 OB06, Technical Manual

Page: 59 / 117

Chapter 4 - System Functions
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A link release failure is shown in Figure 28.
F
I G U R E
2 8 F
A I L U R E O F
L
I N K
R
E L E A S E
MS LAPDm FURRM
HPIMan
LAPD
BSC OAMM
Dm_ DL_REL_R
EQ
DL_ DATA_ IND (REL REQ)
(REL REQ)
(DISC)
Dm_DL_ REL_I
ND
DL _DATA_REQ (REL IND)
(REL IND )
Dm_M DL_ERR_ IN
D
DL_DATA _ REQ (ERR IND)
(ERR IND)
The BSC requests the release of one multi-frame-mode link layer
connection (SAPI=3) on the wireless path.
The OB06 sends a DISC frame and starts the timer T200 at the same time.
If the UA or DM frame is not received until T200 expires, the DISC will be
resent and the resend times will increase by one. If the failure continues,
the Dm_DL_RELEASE_INDICATION and MDL_ERROR_INDICATION
primitives from the data link layer will be received in L3. The latter
primitive records the failure cause: "Timer T200 expires for N200 + 1
times: Execution is released abnormally".
Sending and Receiving of Transparent L3 Message in
Acknowledgment Mode
The transmitting is shown in Figure 29.
F
I G U R E
2 9 S
E N D I N G A
T
R A N S P A R E N T
L 3 M
E S S A G E I N T H E
A
C K N O W L E D G M E N T
M
O D E
MS LAPDm FURRM
HPIMan
LAPD
BSC OAMM
Dm _DL _DATA_ R
EQ
( DATA REQ)
(I frames )
(RR frames )
DL _DATA _IND ( DATA REQ)
The BSC requests to send an acknowledgment mode L3 transparent
message to the MS.