ZXG10-OB06 (V1.0) Integrated Outdoor GSM Base Station Technical Manual
58
Confidential and Proprietary Information of ZTE CORPORATION
Figure 37 shows the mode change failure.
F
I G U R E
3 7
–
F
A I L U R E O F
M
O D E
C
H A N G E
MS
LAPDm
FURRM
HPIMan
LAPD
BSC
OAMM
(MODE MODIFY)
DL_DATA_IND (MODE MODIFY)
MPH_RRC mdToCHP
(CHP MODE
MODIFY)
MPH_CHPIndToRR
(CHP MODE
MODIFY RESP)
DL _DATA_REQ (MODE
MODIFY NACK)
BSC requests to change the channel mode of an activated channel.
BSC sends a MODE MODIFY message to OB06 to trigger
reconfiguration of OB06. When OB06 receives the message, it modifies
the encoding and decoding algorithms, and modifies the in-band mode
of OB06-TRAU frame. The CHP module implements this operation.
After it changes into the new mode, the OB06 returns a MODE MODIFY
ACK message. If the TRX cannot change the mode for some reasons, it
returns a MODE MODIFY NACK message.
If the response message indicates the successful mode change and
TCH channel changes into service mode, FURRM starts the timer to
wait for the CHP SYNCHRONIZED message for the synchronization
between CHP and TC. If it cannot recognize the message, it sends the
CONN FAIL IND message to BSC after the timer expires.
At the same time, BSC sends (RR) CHANNEL MODE MODIFY message.
This message contains the new mode to use to trigger the
reconfiguration of MS. To this message, MS responds with (RR)
CHANNEL MODE MODIFY ACKNOWLEDGE message to BSC through
OB06. If the MS does not support the channel to be modified, it keeps
its original mode. In this case it place related information in the
CHANNEL MODE MODIFY ACKNOWLEDGE message. These two are
transparent messages.
