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Call Setup Success Rate Definition and Troubleshooting

Assim Mubder
Assim Mubder
Assim MubderNDO Regional Manager @ Ericsson at Ericsson

The CSSR indicates the probability of successful calls initiated by the MS. The CSSR is an important KPI for evaluating the network performance. If this KPI is too low, the subscribers are not likely to make calls successfully. The user experience is thus affected.

Call Setup Success Rate Definition and Troubleshooting

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HUAWEI TECHNOLOGIES Co., Ltd.
www.huawei.com
HUAWEI Confidential
Call_Setup_Success_Rate
Definition and Troubleshooting
Simple Presentation
Assim Mubder
26-Aprill-2011
HUAWEI Technologies Co., Ltd.
Definition and Formula
• The CSSR indicates the probability of successful calls initiated by the MS. The
CSSR is an important KPI for evaluating the network performance. If this KPI is
too low, the subscribers are not likely to make calls successfully. The user
experience is thus affected.
• The recommended formula for calculating this KPI is as follows:
CSSR = Successful Assignments/Call-related Requests x 100%
BSS CSSR = Immediate Assignment Success Rate x Assignment Success Rate x
(1 - SDCCH Drop Rate) x 100%
HUAWEI Technologies Co., Ltd.
Measurement Points of the CSSR through the signaling
process of call setup, Digram#1
HUAWEI Technologies Co., Ltd.
Measurement Points of the CSSR through the signaling
process of call setup. Call Setup establishment passes four steps tell
successful call achieved as below#1:
A——Immediate Assignment Requests (Channel Requests (Circuit Service))-Access
B——Successful Immediate Assignments (Call Setup Indications (Circuit Service))-SD
C——TCH Assignment Requests (Seizure Requests)
D——Completed TCH Assignments (Successful TCH Seizures)
The following formula shows the relations between the CSSR and Immediate
Assignment Success Rate, SDCCH Drop Rate, and Assignment Success Rate.
BSS CSSR = Successful Assignments/Call-related Requests
= D/A
= B/A x C/B x D/C
= B/A x (1-(B-C)/B) x D/C
= Immediate Assignment Success Rate x (1 - SDCCH Drop Rate) x Assignment
Success Rate
HUAWEI Technologies Co., Ltd.
Measurement Points of the CSSR through the signaling
process of call setup, Digram#2
HUAWEI Technologies Co., Ltd.
Measurement Points of the CSSR through the signaling
process of call setup, Digram#3
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Call Setup Success Rate Definition and Troubleshooting

  • 1. HUAWEI TECHNOLOGIES Co., Ltd. www.huawei.com HUAWEI Confidential Call_Setup_Success_Rate Definition and Troubleshooting Simple Presentation Assim Mubder 26-Aprill-2011
  • 2. HUAWEI Technologies Co., Ltd. Definition and Formula • The CSSR indicates the probability of successful calls initiated by the MS. The CSSR is an important KPI for evaluating the network performance. If this KPI is too low, the subscribers are not likely to make calls successfully. The user experience is thus affected. • The recommended formula for calculating this KPI is as follows: CSSR = Successful Assignments/Call-related Requests x 100% BSS CSSR = Immediate Assignment Success Rate x Assignment Success Rate x (1 - SDCCH Drop Rate) x 100%
  • 3. HUAWEI Technologies Co., Ltd. Measurement Points of the CSSR through the signaling process of call setup, Digram#1
  • 4. HUAWEI Technologies Co., Ltd. Measurement Points of the CSSR through the signaling process of call setup. Call Setup establishment passes four steps tell successful call achieved as below#1: A——Immediate Assignment Requests (Channel Requests (Circuit Service))-Access B——Successful Immediate Assignments (Call Setup Indications (Circuit Service))-SD C——TCH Assignment Requests (Seizure Requests) D——Completed TCH Assignments (Successful TCH Seizures) The following formula shows the relations between the CSSR and Immediate Assignment Success Rate, SDCCH Drop Rate, and Assignment Success Rate. BSS CSSR = Successful Assignments/Call-related Requests = D/A = B/A x C/B x D/C = B/A x (1-(B-C)/B) x D/C = Immediate Assignment Success Rate x (1 - SDCCH Drop Rate) x Assignment Success Rate
  • 5. HUAWEI Technologies Co., Ltd. Measurement Points of the CSSR through the signaling process of call setup, Digram#2
  • 6. HUAWEI Technologies Co., Ltd. Measurement Points of the CSSR through the signaling process of call setup, Digram#3
  • 7. HUAWEI Technologies Co., Ltd. Measurement Points of the CSSR through the signaling process of call setup, Clarifications#2 The following description covers the interprocess communication to place a mobile on a DCCH and have the mobile in communication with the MSC. 1. The mobile accesses the system with a Random Access burst on the BCCH. 2. The RSS passes the request onto the RRSM via the RCI in the form of a Channel Required message. 3. RRSM asks the CRM to assign a SDCCH channel and the CRM responds. 4. RRSM tells the RSS which DCCH the mobile is to go to and the RSS activates the channel. When channel activated, the RSS informs the RRSM. 5. The RRSM then tells the mobile via the RSS on an Access Granted Channel, which DCCH the mobile is to move to. 6. The mobile moves to the DCCH and establishes two way communication with its allocated BTS. The Mobile forwards CM Service Request, telling the RRSM what the mobile wants to do. Is it – responding to a Page from the MSC? doing a Location Update? IMSI Deregistration? wanting to establish a call? trying to salvage an established call? 7. The RRSM forwards the CM service request up to the SCCP State Machine (SSM). 8. The SSM then has to request the MSC to handle the call. RSS: Radio Sub–system RRSM: Radio Resource State Machine CRM: Cell Resource Manager SSM: SCCP State Machine MTP: Message Transfer Port
  • 8. HUAWEI Technologies Co., Ltd. Measurement Points of the CSSR through the signaling process of call setup, Clarifications #3 The following text describes the interprocess communication for the assignment of a mobile from a DCCH to a traffic channel. This procedure assumes that all authentication has taken place on the DCCH. 1. The MSC sends a message to the SSM assigning the mobile a terrestrial circuit. 2. The SSM sends an initiate assignment command to the RRSM to assign a channel to the mobile. 3. The RRSM asks the CRM to assign Traffic a channel. The CRM responds with the channel. 4. The RRSM then asks the RSS to supply the timing information for the mobile concerned. 5. The RRSM then tells the RSS to activate the required Traffic Channel. 6. The RRSM then instructs the mobile via the RSS to move onto the new traffic channel. 7. The mobile now moves to the new traffic channel and establishes signalling links. 8. The RRSM then informs the SSM that mobile is on its new channel and signalling links have been established, and deactivates the SDCCH channel. 9. The SSM then tells the SM to connect the radio channel to the terrestrial MSC circuit. The SM responds when complete. 10. The SSM then tells the MSC that the mobile is on the new channel and that the radio channel has been connected to the MSC channel. When this procedure is completed, it leaves the mobile on its new traffic channel and ‘talking’ to the MSC.
  • 9. HUAWEI Technologies Co., Ltd. Influencing Factors A. Um Interface ((MS<------> BTS))-Air Interface/MS bases Intra-network interference and inter-network interference, improper parameter (including timers) settings, coverage problems, mobile phone problems, antenna problems, hardware (including repeaters and jumpers) failure B. Abis Interface ((BTS<-----> BSC))-RSL/Cell-Site bases Channel congestion, transmission problems, improper parameter (including timers) settings C. A Interface ((BSC <-----> MSC))-MTL/BSC-bases Transmission problems (congestion and communication quality) D. Call Setup Blocking-TCH Blocking E. Faulty equipments on degraded BSC/site/cell
  • 10. HUAWEI Technologies Co., Ltd. Analysis Process and Optimization#1 Problem handling started When the fault is related to Immediate Assignment Success Rate, SDCCH Drop Rate or Assignment Success Rate Immediate Assignment Success Rate optimized SDCCH Drop Rate optimized Assignment Success Rate optimized Problem handling completed Whether the fault is rectified No Yes
  • 11. HUAWEI Technologies Co., Ltd. Analysis Process and Optimization #2 SN Information Remarks Purpose 1 Software version Software versions of the BSC and BTS Check whether the software version is defective. 2 Data configuration table Configuration files of the BSC, in *.dat format Check the network optimization parameters and power configuration. 3 Alarm information Alarm information related to hardware, clock, and transmission (self-check) Check whether such alarms exist in the faulty cell. Such alarms should be cleared. 4 Traffic measurement <Immediate Assignment Measurement><Assignment Measurement><SDCCH Call Drop Measurement per Cell><KPI Measurement per Cell> Observe the traffic measurement result and check for congestion or interference problems. 5 Signaling RSL signaling tracing of fault occurrence time in the faulty cell Search for the cause of call setup failure. 6 Drive test data *.log (*.CELL) files or *.ant files Observe the drive test data and check for interference or coverage problems 7 Network planning data Engineering parameter tables and e-maps Network planning data facilitates the checking of the geographical information by the NASTAR tool. 8 Optimization Report The optimization report provides the optimization projects described in this manual and implemented on site. The report also provides the optimization measures, which are not described in this manual but implemented on site. The optimization report serves as a reference for future network planning.
  • 12. HUAWEI Technologies Co., Ltd. Investigating Low CSSR by KPIs check Find out the causes of a low CSSR.(Check whether a low CSSR is caused by Immediate Assignment Success Rate problems, SDCCH Drop Rate problems, or Assignment Success Rate problems) A. Conditions for checking whether a low CSSR is caused by Immediate Assignment Success Rate problems. [Call Measurement(CALL)]->[Immediate Assignment Measurement] RA303G: Immediate Assignment Success Rate. RA303G is used to measure the immediate assignment success rate of a cell. If the immediate assignment success rate is low in a cell, optimize the related configurations of the cell by referring to the GSM BSS Network KPI (Immediate Assignment Success Rate) Optimization Manual. B. Conditions for checking whether a low CSSR is caused by SDCCH Drop Rate problems. [Call Measurement(CALL)]-> [SDCCH Call Drop Measurement] ZTR104B: SDCCH Drop Rate. ZTR104B is used to measure the SDCCH drop rate of a cell. If the SDCCH drop rate is low in a cell, optimize the related configurations of the cell by referring to the Network KPI (SDCCH Drop Rate) Optimization Manual. C. Conditions for checking whether a low CSSR is caused by Assignment Success Rate problems. [Call Measurement(CALL)]-> [Assignment Measurement] RCA313: TCH Assignment Success Rate. RCA313 is used to measure the TCH assignment success rate of a cell. If the TCH assignment success rate is low in a cell, optimize the related configurations of the cell by referring to the Network KPI (Assignment Success Rate) Optimization Manual. The following table describes the related counters:
  • 13. HUAWEI Technologies Co., Ltd. Investigating Low CSSR by KPIs check Problem Description BSC-Level Cell-Level TRX-Level Immediate Assignment Success Rate [BSC Measurement(BSC)]->[Access Measurement per BSC] ZTR: BSCRPT_RATE_IMM_ASS_SUCC [Immediate Assignment Measurement per] RA: CELL_RANDOM_ACCESS_SUCC_RATE None SDCCH Drop Rate [BSC Measurement(BSC)]->[Access Measurement per BSC] ZTR: BSCRPT_RATE_SD_CALL_DROP [KPI Measurement per Cell] ZTR: CELL_SD_CALL_DROP [SDCCH Call Drop Measurement per Cell] ZTR104B:CELL_SD_CALL_DROP_CALL None Assignment Success Rate [BSC Measurement(BSC)]->[Access Measurement per BSC] ZTR: BSCRPT_RATE_ASS_SUCC [Call Measurement(CALL)]->[Assignment Measurement] RCA313:CELL_ASS_SUCC_RATE [KPI Measurement per Cell] RA333: CELL_CALL_ESTB_SUCC_RATE RA: CELL_BSS_CALL_ESTB_SUCC_RATE None
  • 14. HUAWEI Technologies Co., Ltd. Preventive actions concerning CSSR • Data base parameters and timers need to be check and audited periodically on cell/site/BSC bases. • Sites and BSCs with transmission problems due to outage, MW problems, all need to be monitored and add redundant RSLs to sites with togging paths, expand E1 to meet the over utilized sites. • Alarms and BSS events should be monitored and cleared on daily bases. • TCH-Blocking need to be monitored and talked immediately by soft/ hard actions once observed. • MSC side should check with core team once a problem observed on specific region/BSC/LAC.
  • 15. HUAWEI TECHNOLOGIES Co., Ltd. www.huawei.com HUAWEI Confidential Thank You www.huawei.com