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