256493040-CSSR-Analysis.pptx

1. 2G KPIs Analysis
Call Setup Success Rate (CSSR)
Prepared by Muhieddine Alqousi
5/25/2023 1

2. 1. Call setup message flow chart.
2. Accessibility KPIs definitions and Formulas
3. CSSR Optimization flow chart and steps
4. Counters and tools to use in CSSR analysis.
5. Practicing CSSR analysis on real cases
ideas to discuss
Prepared by Muhieddine Alqousi
5/25/2023 2

3. • Originating Call setup message Flow
Call setup message flow chart
Prepared by Muhieddine Alqousi
5/25/2023 3

4. 1. Random Access Success Rate
This formula reflects the accessibility on the RACH
Channel:
Accessibility KPIs definitions and Formulas
Prepared by Muhieddine Alqousi
5/25/2023 4
Successfully received Channel
Requests
Total Received Channel
Requests
100 *

5. RACH failures Counters
5/25/2023 Prepared by Muhieddine Alqousi 5
Function subset Counter Name
Call Measurement L3189I:Discarded Channel Requests
Call Measurement
L3188B:MSG CCCH LOAD IND (RACH) Messages Sent on
Abis Interface
Paging
Measurement
A334:Number of Failures to Decode the Code Streams
on the RACH
Paging
Measurement
A336:Number of Successes in Decoding the Code
Streams on the RACH
Paging
Measurement
A349A:RACH Failures (Too High TA)
Paging
Measurement
A333:Average Undecodable Level in the Code Streams
on the RACH

6. 1. SDCCH Seizure Success Rate
This formula reflects the ability to seize SDCCH Channel :
Accessibility KPIs definitions and Formulas
Prepared by Muhieddine Alqousi
5/25/2023 6
CA301J:Immediate Assignment
Commands (Circuit Service)
CA300J:Channel Requests
(Circuit Service)
100 *

7. Immediate Assignment
Counters
5/25/2023 Prepared by Muhieddine Alqousi 7
Function subset Counter Name
Call Measurement
CR330A:Channel Activation Attempts in Immediate Assignment
Procedure
Call Measurement
CR330B:CHAN ACTIV NACK Messages Sent by BTS in Immediate
Assignment Procedure
Call Measurement
CR330C:Channel Activation Timeouts in Immediate Assignment
Procedure
Call Measurement A3010:Immediate Assignment Commands (SDCCH)
Call Measurement A3017:Immediate Assignment Commands (TCHF)
Call Measurement A3018:Immediate Assignment Commands (TCHH)
Call Measurement A302J:Rejects to Immediate Assignments (Circuit Service)
Call Measurement CA301J:Immediate Assignment Commands (Circuit Service)

8. 3. Immediate Assignment Success Rate
Accessibility KPIs definitions and Formulas
Prepared by Muhieddine Alqousi
5/25/2023 8
CA303J:Call Setup Indications
(Circuit Service)
CA300J:Channel Requests
(Circuit Service)
100 *

9. Accessibility KPIs definitions and Formulas
Prepared by Muhieddine Alqousi
5/25/2023 9
Function subset Counter Name
Channel Seizure Measurement per TRX R4400A:Attempted Immediate Assignments (SDCCH)
Channel Seizure Measurement per TRX R4409A:Attempted Immediate Assignments (TCH)
Channel Seizure Measurement per TRX R4400B:Successful Immediate Assignments (SDCCH)
Channel Seizure Measurement per TRX R4409B:Successful Immediate Assignments (TCH)
Channel Seizure Measurement per TRX CR440A:Attempted Immediate Assignments
Channel Seizure Measurement per TRX CR440B:Successful Immediate Assignments
Channel Assignment Success
Measurement per TRX
R4110A:Successful Channel Assignments in
Immediate Assignment Procedure (SDCCH)
Channel Assignment Success
Measurement per TRX
R4117A:Successful Channel Assignments in
Immediate Assignment Procedure (TCHF)
Channel Assignment Success
Measurement per TRX
R4118A:Successful Channel Assignments in
Immediate Assignment Procedure (TCHH)
Immediate Assignment Measurement per
Cell
CA303J:Call Setup Indications (Circuit Service)
Immediate Assignment Measurement per
Cell
CA304:Call Setup Indications Timed Out

10. 4. TCH Seizure Success Rate
Accessibility KPIs definitions and Formulas
Prepared by Muhieddine Alqousi
5/25/2023 10
K3013A:Successful TCH
Seizures (Traffic Channel)
K3010A:TCH Seizure Requests
(Traffic Channel)
100 *

11. 5. TCH Assignment Success Rate
Accessibility KPIs definitions and Formulas
Prepared by Muhieddine Alqousi
5/25/2023 11
CA313:Successful Assignments
CA310:Assignment Requests
100 *

12. Accessibility KPIs definitions and Formulas
Prepared by Muhieddine Alqousi
5/25/2023 12
Function subset Counter Name
Assignment Measurement per Cell A3129E:Failed Assignments (CIC Unavailable)
Assignment Measurement per Cell A3129F:Failed Assignments (CIC Allocated)
Assignment Measurement per Cell A3129G:Failed Assignments (A Interface Failure)
Assignment Measurement per Cell A3129H:Failed Assignments (Clear Commands Sent By MSC)
Assignment Measurement per Cell
A3129B:Failed Assignments (First Assignment, Terrestrial Resource Request
Failed)
Assignment Measurement per Cell CA312:Failed Assignments (Channel Unavailable)
Assignment Measurement per Cell A312F:Number of Assignment Failures (No Abis Resource Available)
Assignment Measurement per Cell A3129S:Failed Assignments (Requested Speech Version Unavailable)
Assignment Measurement per Cell A3169A:Failed Assignments (Um Cause)
Assignment Measurement per Cell A3129T:Failed Assignments (No Ater Resource Available)
Channel Activation Measurement per Cell CR331A:Channel Activation Attempts in Assignment Procedure
Channel Activation Measurement per Cell CR331C:Channel Activation Timeouts in Assignment Procedure
Channel Seizure Measurement per TRX R4419A:Attempted Assignments (TCH)
Channel Seizure Measurement per TRX R4419B:Completed Assignments (TCH)
Channel Assignment Success Measurement
per TRX
R4117B:Successful Channel Assignments during Assignment (TCHF)
Channel Assignment Success Measurement
per TRX
R4118B:Successful Channel Assignments during Assignment (TCHH)
Channel Assignment Success Measurement
per TRX
CR4117:Successful Channel Assignments (TCHF)
Channel Assignment Success Measurement
per TRX
CR4118:Successful Channel Assignments (TCHH)

13. 5. Call Setup Success Rate
Accessibility KPIs definitions and Formulas
Prepared by Muhieddine Alqousi
5/25/2023 13
Immediate Assignment SR%
100-SDCCH Drop Rate%
TCH Assignment SR %

14. CSSR Optimization flow chart
Prepared by Muhieddine Alqousi
5/25/2023 14