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 

MPH_CHPIndToRR 

(CHP CONN FAIL IND) 

(CONN FAIL IND)  

DL_DATA_REQ (CONN FAIL IND) 

 

 

The CONN FAIL IND message that is sent from the BTS to the BSC 

indicates the BSC that one activated channel cannot be used as more for 
some reasons. 

When this message is received, the network side will release the channel. 
The message contains the cause parameter, including the following causes:  

1.  Radio link fault (Section 5 in GSM 05.08): At the BTS, a fault can be 

judged according to the bit error rate of the uplink SACCH or the test 

condition of RXLEV/RXQUAL. 

2.  Hardware error (decoder fault, for example). 
3. Others 
The CHP module will report the error to the FURRM module. In addition, in 
case of failed handover or mis-synchronization between CHP and TC, the 

FURRM also sends this message to the BSC. 

Error Report 

The BTS sends the ERROR REPORT message to the BSC, notifying the 
following errors that cannot be reported with other procedures. 

When the BTS receives the error message, it ignores the message and 
reports to the BSC. Here, the ERROR REPORT is the message involving all 

error causes other than the CHAN ACTIV NACK for channel activation and 
the MODE MODIFY NACK for channel mode modification. 

The error causes include message ID error, message type error, message 
sequence error, information unit error, and channel status mismatch. 

O&M 

The BTS provides powerful O&M functions to implement management and 

maintenance of the BTS equipment. Main functions are divided into three 
parts: Parameter configuration, alarm and status report and software 
online loading.