It’s a process of by which TCH is assigned to the MS. After the SD request MS gets TCH successfully and the call transfers to TCH it means TCH assignment is successful.
For the best KPI TCH assignment should tend to 100%.
It degrades due to HW problems.
Reasons for TCH Assignment failure:
Hardware Fault(TRXs,Combiner,Duplexer,Cables)
VSWR
High Path Loss.
Faulty TMA.
High TCH Blocking.
Loose connections.
DR being used extensively
Solutions for removal of TCH Assignment:
Clear VSWR
IF TRXs are faulty lock them and try to replace them soon to avoid blocking.
Path Imbalance clear.
Connection from BTS to Antenna
Connector connection
Check TMA.
Check Duplexer,Combiner,TRXs connections, Multicoupler etc.
Reports for TCH Assignment:
ZEOL to check alarms
208 for path imbalance
196 for UL-DL interference
ZAHP for Flick report
It degrades due to HW problems.
Reasons for TCH Assignment failure:
Hardware Fault(TRXs,Combiner,Duplexer,Cables)
VSWR
High Path Loss.
Faulty TMA.
High TCH Blocking.
Loose connections.
DR being used extensively
Solutions for removal of TCH Assignment:
Clear VSWR
IF TRXs are faulty lock them and try to replace them soon to avoid blocking.
Path Imbalance clear.
Connection from BTS to Antenna
Connector connection
Check TMA.
Check Duplexer,Combiner,TRXs connections, Multicoupler etc.
Reports for TCH Assignment:
ZEOL to check alarms
208 for path imbalance
196 for UL-DL interference
ZAHP for Flick report
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