ZTE Corporation ZXG-BTS2 Benutzerhandbuch

 
 

Chapter 4 - System Functions 

Confidential and Proprietary Information of ZTE CORPORATION 67 

 

 

MS 

LAPDm 

FURRM 

HPIMan 

LAPD 

BSC 

OAMM 

(PHY INFO) 

Dm_DL_DATA_IN

D (HANDO COM) 

(HANDO DET) 

DL_DATA_REQ (DATA IND 

(HANDO COM)) 

DL_DATA_IND (DATA REQ 

(RR HANDO CMD)) 

Dm_DL_DATA_R

EQ ( HANDO 

CMD) 

(DATA REQ (RR 

HANDO CMD)) 

( HANDO 

CMD) 

Dm_DL_RANDO

M ACCESS_IND 

(HANDO 

ACCESS) 

DL_DATA_REQ (HANDO DET) 

Dm_DL_UNIT 

DATA_REQ 

(PHY INFO) 

T3105 

(HANDO 

COM) 

(DATA IND 

(HANDO COM)) 

Repeat 

Ny1 times 

DL_DATA_REQ (CONN FAIL IND) 

(CONN FAIL IND)  

T3105, Ny1 

(end) 

CHP RET NORM 

ACTIV  

Dm_DL_EST_IND 

(correct L2 frame) 

DL_DATA_REQ (EST IND) 

(EST IND)  

remark

 

 

The handover enables an MS in the dedicated mode to move into another 
channel of another cell.  

When the BSC receives the HANDO REQ message from the MSC, the BSC 
enables the new channel activation procedure. The CHAN ACTIV message 

sent to the TRX contains Handover Reference, which will be used to detect 
the Handover Access message from MS. 

When the channel for handover is activated, the FURRM uses the CHP RET 
NORM ACTIV message to notify the CHP to resume the normal mode.  

The FURRM should save the Handover Reference in the CHAN ACTIV 
message, to compare it with the Handover Reference in the Handover 
Access message that is sent by the LAPDm. 

The (RR) HANDOVER COMMAND message is sent on the active DCCH. This 
transparent message contains new channel characteristics, power 

command, physical channel establish procedure indication, handover 
reference, time lead (optional) and encryption mode setting (optional).It 

also controls whether to connect MS first in synchronous activation mode. 

About the physical channel establishment, in case of synchronous 

handover, when MS is to be connected on the allocated channel, it will