pioneerelex
2011-12-11, 01:09 AM
Hi Friends,
I found this good article about low TCH Assignment Success Rate, please check it below:
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Some possible solution for Low TCH Assignment Success Rate
Successful assignments show the number of successful TCH allocations at call setup.At unsuccessful assignment, the Assignment Complete message, sent by the MS, was never received by the BTS.
Probable Reasons The reason for a low number of successful assignments might be the following items:
1.No Dominant Serving Cell
Action:Check coverage plots, perform drive tests.
Solution:Add new base station.
2.Severe Congestion on the TCH
Action:Check failed TCH allocation for assignment due to congestion.
Check failed TCH allocation for handover due to congestion .
Check TCH congestion.
3.Low Signal Strength for Call Access
The signal strength might be higher on the BCCH than on the TCH.
Action:Check signal strength of BCCH and TCH. Perform MTR recordings.
Solution: Adjust and increase TCH output power.
4.Interference
Interference, disturbance on SDCCH or target TCH frequency.
Action:Check Interference.
Solution:Improve frequency plan and decrease interference.
5.Faulty Transceiver
Action:Check BTS Error Log.
Solution:Replace or repair faulty equipment.
6.Low Output Power
Action:Check set output power parameters and the actual transceiver output power.
Solution: Increase output power or replace faulty transceiver.
I found this good article about low TCH Assignment Success Rate, please check it below:
.................................................
Some possible solution for Low TCH Assignment Success Rate
Successful assignments show the number of successful TCH allocations at call setup.At unsuccessful assignment, the Assignment Complete message, sent by the MS, was never received by the BTS.
Probable Reasons The reason for a low number of successful assignments might be the following items:
1.No Dominant Serving Cell
Action:Check coverage plots, perform drive tests.
Solution:Add new base station.
2.Severe Congestion on the TCH
Action:Check failed TCH allocation for assignment due to congestion.
Check failed TCH allocation for handover due to congestion .
Check TCH congestion.
3.Low Signal Strength for Call Access
The signal strength might be higher on the BCCH than on the TCH.
Action:Check signal strength of BCCH and TCH. Perform MTR recordings.
Solution: Adjust and increase TCH output power.
4.Interference
Interference, disturbance on SDCCH or target TCH frequency.
Action:Check Interference.
Solution:Improve frequency plan and decrease interference.
5.Faulty Transceiver
Action:Check BTS Error Log.
Solution:Replace or repair faulty equipment.
6.Low Output Power
Action:Check set output power parameters and the actual transceiver output power.
Solution: Increase output power or replace faulty transceiver.