ZTE Corporation ZXG-BTS2 Manuale Utente

 
ZXG10-BTS (V2.9) Technical Manual 

Confidential and Proprietary Information of ZTE CORPORATION  

 

MS 

LAPDm 

FURRM 

HPIMa

LAPD 

BSC 

OAMM 

(MODE MODIFY) 

DL_DATA_IND (MODE MODIFY) 

MPH_RRCmdToCHP 

(CHP MODE 

MODIFY) 

MPH_CHPIndToRR 

(CHP MODE 

MODIFY RESP) 

DL_DATA_REQ (MODE 

MODIFY NACK) 

 

 

The BSC requests to change the channel mode of an activated channel. 
The BSC sends a MODE MODIFY to the BTS to trigger the 

reconfiguration of the BTS. When the BTS receives the message, it 
modifies the encoding and decoding algorithms (the CHP module 

implements this operation), and modifies the inband mode of the BTS-
TRAU frame. After it changes into the new mode, the BTS 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 BTS. 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 assignment is shown in Figure 47.