·
The
parameters SACCH
Multi-Frames and
Radio Link
Timeout are set
to too small values.
·
The
parameter RXLEV_ACCESS_MIN
is set to a too
small value.
·
The parameter RACH Min.Access Level is set to a too small value.
·
The
parameters Min
DL Power on HO Candidate Cell and Min
Access Level Offset are
inappropriately set.
·
The
length of timer T3103 (this timer is set to wait for a Handover Complete
message) is set to a too small value.
·
The
length of timer T3109 (this timer is set to wait for a Release Indication
message) is set to a too small value.
·
The
length of timer T3111 (this timer specifies the connection release delay) is
set to a too small value.
·
The
length of timer T305/T308 is set to an invalid or too great value.
·
The
parameter TCH
Traffic Busy Threshold is
set to a too small value.
·
The
parameter Call
Reestablishment Forbidden is
set to Yes.
·
The
parameters related to edge handover are inappropriately set.
·
The
parameters related to BQ handover are inappropriately set.
·
The
parameters related to interference handover are inappropriately set.
·
The
parameters related to concentric cell handover are inappropriately set.
·
The
parameters related to power control are inappropriately set.
·
T200
and N200 are set to too small values.
·
Some
neighboring cell relations are not configured.
·
The
parameter MAIO is inappropriately set.
·
The
parameter Disconnect
Handover Protect Timer is
set to a too small value.
·
The
parameter TR1N is set to a too small value.
·
The
parameters Software
Parameter 13 and MAX TA are set to too small values.
·
If a
repeater is used, the parameter Directly Magnifier Site Flag is set GSM BSS Network KPI (TCH Call Drop Rate) Optimization Manual
INTERNAL to No
·
Drop
due to hardware issue (Faulty, VSWR, ICM, Mismatch combining & Alarm)
·
Drop
due abis link error or high abis link UTL.
·
Drop
due to Co-Channel interference or due to poor Qual UL & DL.
·
Drop
due to poor level UL & DL or due to High TA.
·
Drop
due to HO Delay.
·
Drop
due to Poor Antenna installation.
·
Drop
due to poor path Imbalance ( UL & DL)