ZTE Corporation ZXG-BTS2 Manuale Utente
ZXG10-BTS (V2.9) Technical Manual
60
Confidential and Proprietary Information of ZTE CORPORATION
F
I G U R E
3 3
E
S T A B L I S H I N G A
B S C - O
R I G I N A T E D
L
I N K
MS
LAPDm
FURRM
HPIMa
LAPD
BSC
OAMM
Dm_DL_EST_
REQ
DL_DATA_IND (EST REQ)
(EST REQ)
(SABM)
(UA)
Dm_DL_EST_C
ONF
DL_DATA_REQ (EST_CONF)
(EST CONF)
The BSC request the BTS to establish a link for point-to-point transmission
(SAPI=3) on the wireless path.
A failure of link establishment is shown in Figure 34.
F
I G U R E
3 4
L
I N K
E
S T A B L I S H I N G
F
A I L U R E
MS
LAPDm
FURRM
HPIMa
LAPD
BSC
OAMM
Dm_DL_EST
_REQ
DL_DATA_IND (EST REQ)
(EST REQ)
(SABM)
Dm_DL_REL_IND
DL_DATA_REQ (REL IND)
(REL IND)
Dm_MDL_ERR
_IND
(ERR IND)
DL_DATA_REQ (ERR IND)
When the link connection fails, the FURRM will receive the
Dm_DL_REL_IND and Dm_MDL_ERROR_IND primitives from the data link
Dm_DL_REL_IND and Dm_MDL_ERROR_IND primitives from the data link
layer, and the latter one will record the cause “Timer T200 expires for
N200 + 1 times: Execution released abnormally”. The FURRM places this
N200 + 1 times: Execution released abnormally”. The FURRM places this
cause in the ERROR REPORT message and reports it to the BSC.
Link Release
The link releasing procedure originated by an MS is shown in Figure 35.