TCH drop (or a dropped call)
could be broadly classified into 3 sub classes:
- Degradation of the links (Uplink
and Downlink): either degradation of Signal Strength which falls near or
lower than the sensitivity of the base station (around to -110 dBm) or
that of the mobile (around -104dBm) or degradation of quality of the links
(Uplink and Downlink) often due to interference.
- Excess TA (TA>63 or excess
path imbalance due to high TA).
Measure
Use the following available
stats to measure nature of drop call rate in a cell / BSC
·
Drop Reason: Low Signal Strength DL
%.
·
Drop Reason: Low Signal Strength UL
%.
·
Drop Reason: Bad Quality DL %.
·
Drop Reason: Bad Quality UL %.
·
Drop Reason: Sudden Lost Connections
%.
·
Drop Reason: Excess TA %.
·
Drop Reason: Other %
