GSM calls released by many reasons and all reasons explanation has been dedfined as per standard by ITU. this document contains all those cause values and expalnation.
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Dropped and Blocked Call Event Cause Category
Description
Ranking
IRAT HO to GSM
Dropped call occurs during IRAT Handover
1
Missing Neighbor
Strong Detected Set Neighbor occurs prior to Dropped Call
2
Soft HO
Dropped call occurs during SoftHandover
3
Poor DL Coverage
Last best server RSCP is below user-defined RSCP threshold
4
DL Inteference
Last best server Ec/No is below user-defined RSCP threshold
5
High UL TX Power
Last measured UL Tx Power is 6 above or equal user-defined UL Tx Power threshold
High DL BLER
Last DL BLER is above or equal user-defined BLER threshold
7
Other
None of above
8
WCDMA Dropped Event Cause
GSM Dropped Event Cause Poor DL Coverage
Last best server RxLevSub is below 1 user-defined RxLevel threshold
DL Inteference
Last best server RxQualSub is below user-defined RxQual threshold
2
Other
None of above
3
Strong Detected Set Neighbor occurs prior to Blocked Call
1
WCDMA Blocked Event Cause Missing Neighbor Random Access
Blocked call occurr during Random 2 Access. RRC Connection Setup Received
RRC RRC Setu Setup p Comp Comple lete te Not Not Sen Sentt
No RRC RRC Con Conne nect ctio ion n Setu Setup p Complete message sent after receiving RRC Connection Setup message
3
RRC Connect Reject
RRC Connection Setup Reject message received
4
Service Request Not Sent
No CM Service Request sent
5
Setup Not Sent
No Setup message sent
6
Radio Bearer Complete Not Sent
No Radio Bearer Setup Complete message sent
7
No Alerting or Connect message received
8
Alerting/Connect Alerting/Connect Not Received Call Call Proc Procee eedi ding ng Not Not Rec Recei eive ved d
No Call Call Proc Proces essi sing ng Mes Messa sage ge
