Post on 14-Apr-2015
description
Impact analysis of IMEIFETCHCIPH in call set up time
2G Call flow for Mobile originating call
MS
Channel request (RACH)
Immediate assignment (AGCH)
Authenticate
Authenticate Response
Cipher Mode Command
Cipher mode Complete
Identity Request
Identity Response
Call Proceeding
Set up
Assignment Command
Assignment Complete
Alerting (FACCH)
MSSBSS
2G Call Flow when IMEIFETCHCIPH=0
With IMEIFETCHCIPH=0 IMEI is asked in Idenity request phase
2G Call flow when IMEIFETCHCIPH=1
With IMEIFETCHCIPH=1 IMEI is asked in ciphering mode command eliminating identity request and identity response phases
Overall impact- No of phases in call set up time reduces and overall call setup time reduces in Test MSC
3G Call Flow : Simplified
3G BEFORE
3G AFTER
AIRTEL IMEIFETCHCIPH=0 IMEIFETCHCIPH=1
Different Phases for Call setup Average Time (ms) Average Time (ms) Different Phases for Call setup Average Time (ms)
Immediate Assingment-Channel Request 00:00.1 00:00.1 Immediate Assingment-Channel Request 00:00.0
Authentication Request-Immediate Assingment 00:00.5 00:00.6 Authentication Request-Immediate Assingment 00:00.6
Authentication Response-Authentication Request 00:00.2 00:00.2 Authentication Response-Authentication Request 00:00.1
Cipher Mode Command-Authentication Response 00:00.2 00:00.3
Cipher Mode Complete-Cipher Mode Command 00:00.0 00:00.0
Setup-Cipher Mode Complete 00:00.0 00:00.0 Setup-Authentication Response 00:00.4
Call Proceeding-Setup 00:00.7 00:00.5 Call Proceeding-Setup 00:00.4
Assing Command-Call Proceeding 00:00.4 00:00.6 Assing Command-Call Proceeding 00:03.0
Assingnment Complete-Assing Command 00:00.1 00:00.0 Assingnment Complete-Assing Command 00:00.0
Alerting-Assingnment Complete 00:04.2 00:03.7 Alerting-Assingnment Complete 00:01.3
TOTAL CALL SETUP TIME 00:06.5 00:05.9 TOTAL CALL SETUP TIME 00:05.9
AIRTEL IMEIFETCHCIPH=0 IMEIFETCHCIPH=1
Different Phases for Call setup Average Time (ms) Average Time (ms) Different Phases for Call setup Average Time (ms)
Immediate Assingment-Channel Request 00:00.0 00:00.1 Immediate Assingment-Channel Request 00:00.0
Cipher Mode Command-Immediate Assingment 00:00.6 00:00.6 Setup-Immediate Assingment 00:00.5
Cipher Mode Complete-Cipher Mode Command 00:00.0 00:00.0
Setup-Cipher Mode Complete 00:00.0 00:00.0
Call Proceeding-Setup 00:00.9 00:00.7 Call Proceeding-Setup 00:00.5
Assing Command-Call Proceeding 00:00.5 00:00.5 Assing Command-Call Proceeding 00:02.8
Assingnment Complete-Assing Command 00:00.0 00:00.0 Assingnment Complete-Assing Command 00:00.0
Alerting-Assingnment Complete 00:04.2 00:03.6 Alerting-Assingnment Complete 00:01.3
TOTAL CALL SETUP TIME 00:06.3 00:05.5 TOTAL CALL SETUP TIME 00:05.1
Ciphering not active
Ciphering not active
WITH AUTHENTICATION
WITH OUT AUTHENTICATION
VODAFONE
VODAFONE
Call set up time Observation in MSC 8
Reduction in overall call set up time after making IMEIFETCHCIPH=1
Call set up time Observation in MSC7
AIRTEL IMEIFETCHCIPH=0 IMEIFETCHCIPH=1
Different Phases for Call setup Average Time (ms) Average Time (ms) Different Phases for Call setup Average Time (ms)
Immediate Assignment-Channel Request 00:00.1 00:00.1 Immediate Assignment-Channel Request 00:00.0
Authentication Request-Immediate Assignment 00:00.5 00:00.6 Authentication Request-Immediate Assignment 00:00.6
Authentication Response-Authentication Request 00:00.2 00:00.2 Authentication Response-Authentication Request 00:00.1
Cipher Mode Command-Authentication Response 00:00.3 00:00.3
Cipher Mode Complete-Cipher Mode Command 00:00.0 00:00.0
Setup-Cipher Mode Complete 00:00.0 00:00.0 Setup-Authentication Response 00:00.6
Call Proceeding-Setup 00:00.7 00:00.5 Call Proceeding-Setup 00:00.4
Assign Command-Call Proceeding 00:00.4 00:00.3 Assign Command-Call Proceeding 00:00.5
Assignment Complete-Assign Command 00:00.0 00:00.0 Assignment Complete-Assign Command 00:00.0
Alerting-Assignment Complete 00:04.0 00:04.0 Alerting-Assignment Complete 00:03.1
TOTAL CALL SETUP TIME 00:06.2 00:06.0 TOTAL CALL SETUP TIME 00:05.3
AIRTEL IMEIFETCHCIPH=0 imeifetchciph=1
Different Phases for Call setup Average Time (ms) Average Time (ms) Different Phases for Call setup Average Time (ms)
Immediate Assignment-Channel Request 00:00.1 00:00.1 Immediate Assignment-Channel Request 00:00.0
Cipher Mode Command-Immediate Assignment 00:00.6 00:00.5 Setup-Immediate Assignment 00:01.0
Cipher Mode Complete-Cipher Mode Command 00:00.0 00:00.0
Setup-Cipher Mode Complete 00:00.0 00:00.0
Call Proceeding-Setup 00:00.9 00:00.7 Call Proceeding-Setup 00:00.4
Assign Command-Call Proceeding 00:00.3 00:00.2 Assign Command-Call Proceeding 00:00.5
Assignment Complete-Assign Command 00:00.0 00:00.0 Assignment Complete-Assign Command 00:00.0
Alerting-Assignment Complete 00:04.1 00:04.1 Alerting-Assignment Complete 00:03.1
TOTAL CALL SETUP TIME 00:06.1 00:05.7 TOTAL CALL SETUP TIME 00:05.2
WITH AUTHENTICATION
WITH OUT AUTHENTICATIONVODAFONE
Ciphering Not Active
VODAFONE
Ciphering Not Active
Reduction in overall call set up time after making IMEIFETCHCIPH=1
Observation
Need to test first in test Bed
Need to make 50-50 calls from Mobile to PSTN and Mobile to
mobileand take average
time for call setup
PRE SELECTIVE AUTHENTICATION ACTIVATION
2 SIM card required
• Need to make 50-50 calls from Mobile to PSTN and Mobile to mobileand take average time for call setup
POST SELECTIVE AUTHENTIFICATION ACTIVATION with AUTHENTICATION
2 SIM card required
Testing Results Format
Average Call Setup Time (sec)
IMEIFETCHCIPH=0 IMEIFETCHCIPH=1
PRE(landline) Pre (Mobile) Post (landline) POST(Mobile)
6.558 5.4 6.32 5.1