Zte ZXG10 OB06, Technical Manual

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Chapter 4 - System Functions
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The BSC requests to change the channel mode of an activated channel.
The BSC sends a MODE MODIFY to the OB06 to trigger the
reconfiguration of the OB06. When the OB06 receives the message, it
modifies the encoding and decoding algorithms (the CHP module
implements this operation), and modifies the inband mode of the
OB06-TRAU frame. 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 the
TCH channel changes into the service mode, the FURRM starts the
timer to wait for the CHP SYNCHRONIZED message for the
synchronization between CHP and TC. If the message is not received
when the timer expires, it sends the CONN FAIL IND message to the
BSC.
At the same time, the BSC sends a (RR) CHANNEL MODE MODIFY
message that contains the new mode to be used to trigger the
reconfiguration of the MS. When it is implemented, the MS responds
with the (RR) CHANNEL MODE MODIFY ACKNOWLEDGE message to the
BSC through the OB06. If the MS does not support the channel to be
modified, it will keep its original mode, and place related information in
the CHANNEL MODE MODIFY ACKNOWLEDGE message. These two are
transparent messages.
2. Connection allocation
The procedure of connection allocation is shown in Figure 38.
F
I G U R E
3 8 C
O N N E C T I O N
A
L L O C A T I O N
MS LAPDm FURRM
HPIMan
LAPD
BSC OAMM
DATA REQ
( ASSIGN CM D)
DL _DATA_ IND (DATA REQ
( ASSIGN CM D ))
Dm _DL_ DATA_ R
EQ ( ASSIGN
CM D)
( ASSIGN
CM D)
Ol
d
c
h
a
n
n
el
DATA IND
( ASSIGN FAIL)
DL _DATA _REQ (DATA IND
( ASSIGN FAIL))
Dm _DL_DATA _IN
D ( ASSIGN FAIL)
( ASSIGN
FAIL)
DATA IND
( ASSIGN COM P)
DL_DATA _REQ (DATA IND
( ASSIGN COM P))
Dm _DL_DATA _IN
D ( ASSIGN
COM P)
( ASSIGN
COM P)
Ol
d
c
h
an
n
el
Ne
w c
h
a
n
n
el
The wireless link is changed in the same cell.
The BSC commands the OB06 activation through a simple
request/acknowledgement procedure (see the CHAN ACTIV and CHAN
ACTIV ACK of the “access” procedure). Once the OB06 is activated, the
BSC commands the MS to perform channel change through the (RR)
ASSIGNMENT COMMAND message. When the MS changes its settings
according to the new information and establishes a new signaling link,