SlideShare a Scribd company logo

Sdcch drop rate

Terra Sacrifice
Terra Sacrifice
Terra Sacrificetelecoms engr

drop call rate

Sdcch drop rate

1 of 38
Download to read offline
Knowledge sharing sessions
SDCCH Drop Rate
BENAIAD Abdellah
Overview
Used Tools
Technical Procedure
Flow Chart
Exemples
SDCCH
SDCCH Drop Rate
Assignment on SDCCH
Overview
This chapter is designed to provide an overview of
root cause analysis for SDCCH drop rate KPI. It
addresses the SDCCH drop rate analysis, investigation
procedures and troubleshooting techniques to degrade
the effect of this issue.
05/08/2015 SDCCH Drop Rate
Introduction
Used ToolOverview Flow Chart ExamplesTechnical procedure
Overview
SDCCH is a bidirectional logical channel used in
different ways:
-Registration: periodic location update, IMSI
attach/detach.
-Call setup: immediate assignment.
-SMS to/from MS in dedicated mode.
05/08/2015 SDCCH Drop Rate
Introduction
SDCCH Drop Rate
Assignment on SDCCH
SDCCH
Used ToolOverview Flow Chart ExamplesTechnical procedure
Overview Request and allocation of SDCCH:
05/08/2015 SDCCH Drop Rate
Introduction
SDCCH
SDCCH Drop Rate
Assignment on SDCCH
Used ToolOverview Flow Chart ExamplesTechnical procedure
Ch Activation
Acknowledge
Immediate
assignment
command Immediate
assignment
Channel required
RACH
PCH
Channel request
Paging
request
Paging
command
05/08/2015 SDCCH Drop Rate
BSC BTS MS
MS
C Paging
Channel Activation
Used ToolOverview Flow Chart ExamplesTechnical procedure
Overview
SDCCH Drop Rate is a KPI which largely decides the
subscriber service quality , the existing KPI formula is
listed below:
(C10602+C10604+C10605+C10646+C10653+C10601+C10603+C10606)*100
(C11644+C11646)
05/08/2015 SDCCH Drop Rate
Introduction
SDCCH
Assignment on SDCCH
SDCCH Drop Rate
Used ToolOverview Flow Chart ExamplesTechnical procedure
Ad

Recommended

Lte irat-troubleshooting-guide
Lte irat-troubleshooting-guideLte irat-troubleshooting-guide
Lte irat-troubleshooting-guideDenmark Wilson
 
Huawei case analysis call drop
Huawei case analysis call dropHuawei case analysis call drop
Huawei case analysis call dropMuffat Itoro
 
2 g training optimization
2 g training optimization2 g training optimization
2 g training optimizationAhmed Gad
 
Alex optimization guidelines - retainability huawei - rev.01
Alex    optimization guidelines - retainability huawei - rev.01Alex    optimization guidelines - retainability huawei - rev.01
Alex optimization guidelines - retainability huawei - rev.01Victor Perez
 
07 gsm bss network kpi (call setup success rate) optimization manual
07 gsm bss network kpi (call setup success rate) optimization manual07 gsm bss network kpi (call setup success rate) optimization manual
07 gsm bss network kpi (call setup success rate) optimization manualtharinduwije
 
2G optimization_with_optima
2G optimization_with_optima2G optimization_with_optima
2G optimization_with_optimaZIZI Yahia
 
Nokia gsm-kpi-analysis-based-on-daily-monitoring-basis-presentation
Nokia gsm-kpi-analysis-based-on-daily-monitoring-basis-presentationNokia gsm-kpi-analysis-based-on-daily-monitoring-basis-presentation
Nokia gsm-kpi-analysis-based-on-daily-monitoring-basis-presentationmohammed khairy
 
02 gsm bss network kpi (sdcch call drop rate) optimization manual
02 gsm bss network kpi (sdcch call drop rate) optimization manual02 gsm bss network kpi (sdcch call drop rate) optimization manual
02 gsm bss network kpi (sdcch call drop rate) optimization manualtharinduwije
 

More Related Content

What's hot

Ericsson optimization opti
Ericsson optimization optiEricsson optimization opti
Ericsson optimization optiTerra Sacrifice
 
Huawei parameter strategy v1.4 1st dec
Huawei parameter strategy v1.4  1st decHuawei parameter strategy v1.4  1st dec
Huawei parameter strategy v1.4 1st decKetut Widya
 
05 gsm bss network kpi (tch congestion rate) optimization manual
05 gsm bss network kpi (tch congestion rate) optimization manual05 gsm bss network kpi (tch congestion rate) optimization manual
05 gsm bss network kpi (tch congestion rate) optimization manualtharinduwije
 
Call Setup Success Rate Definition and Troubleshooting
Call Setup Success Rate Definition and Troubleshooting Call Setup Success Rate Definition and Troubleshooting
Call Setup Success Rate Definition and Troubleshooting Assim Mubder
 
Kpi 2g troubleshootin
Kpi 2g troubleshootinKpi 2g troubleshootin
Kpi 2g troubleshootinAbd Yehia
 
RSCP RSSI EC/NO CQI
RSCP RSSI EC/NO CQIRSCP RSSI EC/NO CQI
RSCP RSSI EC/NO CQIFaraz Husain
 
08102014_Huawei handovers-handover-algo
08102014_Huawei handovers-handover-algo08102014_Huawei handovers-handover-algo
08102014_Huawei handovers-handover-algoherobinh
 
03 gsm bss network kpi (sdcch congestion rate) optimization manual
03 gsm bss network kpi (sdcch congestion rate) optimization manual03 gsm bss network kpi (sdcch congestion rate) optimization manual
03 gsm bss network kpi (sdcch congestion rate) optimization manualtharinduwije
 
Sharing session huawei network optimization january 2015 ver3
Sharing session huawei network optimization january 2015 ver3Sharing session huawei network optimization january 2015 ver3
Sharing session huawei network optimization january 2015 ver3Arwan Priatna
 
Kpi analysis
Kpi analysisKpi analysis
Kpi analysisavneesh7
 
Wcdma power control
Wcdma power controlWcdma power control
Wcdma power controlMostafa Adel
 
10 gsm bss network kpi (uplink downlink balance) optimization manual[1].doc
10 gsm bss network kpi (uplink downlink balance) optimization manual[1].doc10 gsm bss network kpi (uplink downlink balance) optimization manual[1].doc
10 gsm bss network kpi (uplink downlink balance) optimization manual[1].doctharinduwije
 
Sdcch Blocking Analysis
Sdcch Blocking AnalysisSdcch Blocking Analysis
Sdcch Blocking AnalysisAssim Mubder
 
01 gsm bss network kpi (mos) optimization manual
01 gsm bss network kpi (mos) optimization manual01 gsm bss network kpi (mos) optimization manual
01 gsm bss network kpi (mos) optimization manualtharinduwije
 
Huawei - Access failures troubleshooting work shop
Huawei - Access failures troubleshooting work shopHuawei - Access failures troubleshooting work shop
Huawei - Access failures troubleshooting work shopnavaidkhan
 

What's hot (20)

Ericsson optimization opti
Ericsson optimization optiEricsson optimization opti
Ericsson optimization opti
 
Huawei parameter strategy v1.4 1st dec
Huawei parameter strategy v1.4  1st decHuawei parameter strategy v1.4  1st dec
Huawei parameter strategy v1.4 1st dec
 
Sdcch drop rate
Sdcch  drop  rateSdcch  drop  rate
Sdcch drop rate
 
05 gsm bss network kpi (tch congestion rate) optimization manual
05 gsm bss network kpi (tch congestion rate) optimization manual05 gsm bss network kpi (tch congestion rate) optimization manual
05 gsm bss network kpi (tch congestion rate) optimization manual
 
Call Setup Success Rate Definition and Troubleshooting
Call Setup Success Rate Definition and Troubleshooting Call Setup Success Rate Definition and Troubleshooting
Call Setup Success Rate Definition and Troubleshooting
 
Kpi 2g troubleshootin
Kpi 2g troubleshootinKpi 2g troubleshootin
Kpi 2g troubleshootin
 
RSCP RSSI EC/NO CQI
RSCP RSSI EC/NO CQIRSCP RSSI EC/NO CQI
RSCP RSSI EC/NO CQI
 
08102014_Huawei handovers-handover-algo
08102014_Huawei handovers-handover-algo08102014_Huawei handovers-handover-algo
08102014_Huawei handovers-handover-algo
 
03 gsm bss network kpi (sdcch congestion rate) optimization manual
03 gsm bss network kpi (sdcch congestion rate) optimization manual03 gsm bss network kpi (sdcch congestion rate) optimization manual
03 gsm bss network kpi (sdcch congestion rate) optimization manual
 
gsm-kpi-optimization
 gsm-kpi-optimization gsm-kpi-optimization
gsm-kpi-optimization
 
Sharing session huawei network optimization january 2015 ver3
Sharing session huawei network optimization january 2015 ver3Sharing session huawei network optimization january 2015 ver3
Sharing session huawei network optimization january 2015 ver3
 
Irat handover basics
Irat handover basicsIrat handover basics
Irat handover basics
 
Kpi analysis
Kpi analysisKpi analysis
Kpi analysis
 
Sdcch
SdcchSdcch
Sdcch
 
Wcdma power control
Wcdma power controlWcdma power control
Wcdma power control
 
10 gsm bss network kpi (uplink downlink balance) optimization manual[1].doc
10 gsm bss network kpi (uplink downlink balance) optimization manual[1].doc10 gsm bss network kpi (uplink downlink balance) optimization manual[1].doc
10 gsm bss network kpi (uplink downlink balance) optimization manual[1].doc
 
Sdcch Blocking Analysis
Sdcch Blocking AnalysisSdcch Blocking Analysis
Sdcch Blocking Analysis
 
01 gsm bss network kpi (mos) optimization manual
01 gsm bss network kpi (mos) optimization manual01 gsm bss network kpi (mos) optimization manual
01 gsm bss network kpi (mos) optimization manual
 
Cs fallback feature
Cs fallback featureCs fallback feature
Cs fallback feature
 
Huawei - Access failures troubleshooting work shop
Huawei - Access failures troubleshooting work shopHuawei - Access failures troubleshooting work shop
Huawei - Access failures troubleshooting work shop
 

Viewers also liked

Viewers also liked (20)

Elvis Collection Compilation
Elvis Collection CompilationElvis Collection Compilation
Elvis Collection Compilation
 
Dossier lcl vodkas and mixers
Dossier lcl vodkas and mixersDossier lcl vodkas and mixers
Dossier lcl vodkas and mixers
 
Quédate en Silencio
Quédate en SilencioQuédate en Silencio
Quédate en Silencio
 
Instalación de compact flash en un i pod
Instalación de compact flash en un i podInstalación de compact flash en un i pod
Instalación de compact flash en un i pod
 
Social Media_bei_SWISS
Social Media_bei_SWISSSocial Media_bei_SWISS
Social Media_bei_SWISS
 
Mias internet
Mias internetMias internet
Mias internet
 
Commercial catalogue
Commercial catalogue Commercial catalogue
Commercial catalogue
 
Posicionadores de botellas GMS
Posicionadores de botellas GMSPosicionadores de botellas GMS
Posicionadores de botellas GMS
 
Company Credit Reports Europe
Company Credit Reports EuropeCompany Credit Reports Europe
Company Credit Reports Europe
 
Entrevista a rodrigo romo
Entrevista a rodrigo romoEntrevista a rodrigo romo
Entrevista a rodrigo romo
 
Chapter 2
Chapter 2Chapter 2
Chapter 2
 
A Scalable Approach for Malware Detec2on through Bounded Feature Space Behavi...
A Scalable Approach for Malware Detec2on through Bounded Feature Space Behavi...A Scalable Approach for Malware Detec2on through Bounded Feature Space Behavi...
A Scalable Approach for Malware Detec2on through Bounded Feature Space Behavi...
 
Umbrella
UmbrellaUmbrella
Umbrella
 
Qué es el marketing con artículos
Qué es el marketing con artículosQué es el marketing con artículos
Qué es el marketing con artículos
 
SCR Heatime HR System
SCR Heatime HR SystemSCR Heatime HR System
SCR Heatime HR System
 
ClaudioAbad-TFinaleMasterICT2010
ClaudioAbad-TFinaleMasterICT2010ClaudioAbad-TFinaleMasterICT2010
ClaudioAbad-TFinaleMasterICT2010
 
Tie - Presentacion Agencieros
Tie - Presentacion AgencierosTie - Presentacion Agencieros
Tie - Presentacion Agencieros
 
Qué es la serigrafía dany
Qué es la serigrafía danyQué es la serigrafía dany
Qué es la serigrafía dany
 
Hoy me amo más
Hoy me amo másHoy me amo más
Hoy me amo más
 
Folleto pueblos originarios
Folleto pueblos originariosFolleto pueblos originarios
Folleto pueblos originarios
 

Similar to Sdcch drop rate

CA Unified Infrastructure Management Network Performance Management Capabili...
 CA Unified Infrastructure Management Network Performance Management Capabili... CA Unified Infrastructure Management Network Performance Management Capabili...
CA Unified Infrastructure Management Network Performance Management Capabili...CA Technologies
 
Real World Problem Solving Using Application Performance Management 10
Real World Problem Solving Using Application Performance Management 10Real World Problem Solving Using Application Performance Management 10
Real World Problem Solving Using Application Performance Management 10CA Technologies
 
Signal-Oriented ECUs in a Centralized Service-Oriented Architecture: Scalabil...
Signal-Oriented ECUs in a Centralized Service-Oriented Architecture: Scalabil...Signal-Oriented ECUs in a Centralized Service-Oriented Architecture: Scalabil...
Signal-Oriented ECUs in a Centralized Service-Oriented Architecture: Scalabil...RealTime-at-Work (RTaW)
 
Nokia kpi and_core_optimization
Nokia kpi and_core_optimizationNokia kpi and_core_optimization
Nokia kpi and_core_optimizationdebasish goswami
 
15 - Introduction to Optimization Tools Rev A.ppt
15 - Introduction to Optimization Tools Rev A.ppt15 - Introduction to Optimization Tools Rev A.ppt
15 - Introduction to Optimization Tools Rev A.pptMohamedShabana37
 
Sybase ASE 15.7- Two Case Studies of Successful Migration
Sybase ASE 15.7- Two Case Studies of Successful Migration Sybase ASE 15.7- Two Case Studies of Successful Migration
Sybase ASE 15.7- Two Case Studies of Successful Migration SAP Technology
 
Aerospace maintenance facility increases utilization by 50%, saves money
Aerospace maintenance facility increases utilization by 50%, saves moneyAerospace maintenance facility increases utilization by 50%, saves money
Aerospace maintenance facility increases utilization by 50%, saves moneyIntelligentManufacturingInstitute
 
Industrial automation - Sensors and Transducers
Industrial automation - Sensors and TransducersIndustrial automation - Sensors and Transducers
Industrial automation - Sensors and TransducersRamaniIA
 
Telecoms Service Assurance & Service Fulfillment with Neo4j Graph Database
Telecoms Service Assurance & Service Fulfillment with Neo4j Graph DatabaseTelecoms Service Assurance & Service Fulfillment with Neo4j Graph Database
Telecoms Service Assurance & Service Fulfillment with Neo4j Graph DatabaseNeo4j
 
The Data Center and Hadoop
The Data Center and HadoopThe Data Center and Hadoop
The Data Center and HadoopMichael Zhang
 
Instruments & control System Engineer
Instruments & control System EngineerInstruments & control System Engineer
Instruments & control System EngineerPrabu Singarayar
 
M b slides diagnostics 3-schmidgall_v7, 2010
M b slides diagnostics 3-schmidgall_v7, 2010M b slides diagnostics 3-schmidgall_v7, 2010
M b slides diagnostics 3-schmidgall_v7, 2010goodgolier
 
dokumen.tips_nokia-gsm-optimization.ppt
dokumen.tips_nokia-gsm-optimization.pptdokumen.tips_nokia-gsm-optimization.ppt
dokumen.tips_nokia-gsm-optimization.pptEyeonallthings
 
IRJET- An Efficient and Low Power Sram Testing using Clock Gating
IRJET-  	  An Efficient and Low Power Sram Testing using Clock GatingIRJET-  	  An Efficient and Low Power Sram Testing using Clock Gating
IRJET- An Efficient and Low Power Sram Testing using Clock GatingIRJET Journal
 
IRJET- Metastability Mitigation & Error Masking of High Speed Flip-Flop
IRJET- Metastability Mitigation & Error Masking of High Speed Flip-FlopIRJET- Metastability Mitigation & Error Masking of High Speed Flip-Flop
IRJET- Metastability Mitigation & Error Masking of High Speed Flip-FlopIRJET Journal
 

Similar to Sdcch drop rate (20)

CA Unified Infrastructure Management Network Performance Management Capabili...
 CA Unified Infrastructure Management Network Performance Management Capabili... CA Unified Infrastructure Management Network Performance Management Capabili...
CA Unified Infrastructure Management Network Performance Management Capabili...
 
Real World Problem Solving Using Application Performance Management 10
Real World Problem Solving Using Application Performance Management 10Real World Problem Solving Using Application Performance Management 10
Real World Problem Solving Using Application Performance Management 10
 
Signal-Oriented ECUs in a Centralized Service-Oriented Architecture: Scalabil...
Signal-Oriented ECUs in a Centralized Service-Oriented Architecture: Scalabil...Signal-Oriented ECUs in a Centralized Service-Oriented Architecture: Scalabil...
Signal-Oriented ECUs in a Centralized Service-Oriented Architecture: Scalabil...
 
Nokia kpi and_core_optimization
Nokia kpi and_core_optimizationNokia kpi and_core_optimization
Nokia kpi and_core_optimization
 
15 - Introduction to Optimization Tools Rev A.ppt
15 - Introduction to Optimization Tools Rev A.ppt15 - Introduction to Optimization Tools Rev A.ppt
15 - Introduction to Optimization Tools Rev A.ppt
 
Sybase ASE 15.7- Two Case Studies of Successful Migration
Sybase ASE 15.7- Two Case Studies of Successful Migration Sybase ASE 15.7- Two Case Studies of Successful Migration
Sybase ASE 15.7- Two Case Studies of Successful Migration
 
Aerospace maintenance facility increases utilization by 50%, saves money
Aerospace maintenance facility increases utilization by 50%, saves moneyAerospace maintenance facility increases utilization by 50%, saves money
Aerospace maintenance facility increases utilization by 50%, saves money
 
ADCS in ASICs
ADCS in ASICsADCS in ASICs
ADCS in ASICs
 
Industrial automation - Sensors and Transducers
Industrial automation - Sensors and TransducersIndustrial automation - Sensors and Transducers
Industrial automation - Sensors and Transducers
 
Telecoms Service Assurance & Service Fulfillment with Neo4j Graph Database
Telecoms Service Assurance & Service Fulfillment with Neo4j Graph DatabaseTelecoms Service Assurance & Service Fulfillment with Neo4j Graph Database
Telecoms Service Assurance & Service Fulfillment with Neo4j Graph Database
 
The Data Center and Hadoop
The Data Center and HadoopThe Data Center and Hadoop
The Data Center and Hadoop
 
Instruments & control System Engineer
Instruments & control System EngineerInstruments & control System Engineer
Instruments & control System Engineer
 
M b slides diagnostics 3-schmidgall_v7, 2010
M b slides diagnostics 3-schmidgall_v7, 2010M b slides diagnostics 3-schmidgall_v7, 2010
M b slides diagnostics 3-schmidgall_v7, 2010
 
Scott McParland 2016
Scott McParland 2016Scott McParland 2016
Scott McParland 2016
 
Group H Final Report
Group H Final ReportGroup H Final Report
Group H Final Report
 
Group H Final Report
Group H Final ReportGroup H Final Report
Group H Final Report
 
dokumen.tips_nokia-gsm-optimization.ppt
dokumen.tips_nokia-gsm-optimization.pptdokumen.tips_nokia-gsm-optimization.ppt
dokumen.tips_nokia-gsm-optimization.ppt
 
IRJET- An Efficient and Low Power Sram Testing using Clock Gating
IRJET-  	  An Efficient and Low Power Sram Testing using Clock GatingIRJET-  	  An Efficient and Low Power Sram Testing using Clock Gating
IRJET- An Efficient and Low Power Sram Testing using Clock Gating
 
S7 bas-16
S7 bas-16S7 bas-16
S7 bas-16
 
IRJET- Metastability Mitigation & Error Masking of High Speed Flip-Flop
IRJET- Metastability Mitigation & Error Masking of High Speed Flip-FlopIRJET- Metastability Mitigation & Error Masking of High Speed Flip-Flop
IRJET- Metastability Mitigation & Error Masking of High Speed Flip-Flop
 

More from Terra Sacrifice

Smallcellsforumforjason 150318164026-conversion-gate01
Smallcellsforumforjason 150318164026-conversion-gate01Smallcellsforumforjason 150318164026-conversion-gate01
Smallcellsforumforjason 150318164026-conversion-gate01Terra Sacrifice
 
Hwlte rf-optimization-guide-140704020836-phpapp02
Hwlte rf-optimization-guide-140704020836-phpapp02Hwlte rf-optimization-guide-140704020836-phpapp02
Hwlte rf-optimization-guide-140704020836-phpapp02Terra Sacrifice
 
Introduction to-telecommunication-rf
Introduction to-telecommunication-rfIntroduction to-telecommunication-rf
Introduction to-telecommunication-rfTerra Sacrifice
 
Drivetest training znix team
Drivetest training znix teamDrivetest training znix team
Drivetest training znix teamTerra Sacrifice
 
Wcdmaphysicallayer 111120031701-phpapp02
Wcdmaphysicallayer 111120031701-phpapp02Wcdmaphysicallayer 111120031701-phpapp02
Wcdmaphysicallayer 111120031701-phpapp02Terra Sacrifice
 
2gcaseanalsyishandover training
2gcaseanalsyishandover training2gcaseanalsyishandover training
2gcaseanalsyishandover trainingTerra Sacrifice
 
Rf bts configurations v1
Rf bts configurations v1Rf bts configurations v1
Rf bts configurations v1Terra Sacrifice
 
Cluster optimization procedure v1
Cluster optimization procedure v1Cluster optimization procedure v1
Cluster optimization procedure v1Terra Sacrifice
 
Huawei umts o&m planning and configuration
Huawei umts o&m planning and configurationHuawei umts o&m planning and configuration
Huawei umts o&m planning and configurationTerra Sacrifice
 
Rf bts configurations v1
Rf bts configurations v1Rf bts configurations v1
Rf bts configurations v1Terra Sacrifice
 

More from Terra Sacrifice (16)

Smallcellsforumforjason 150318164026-conversion-gate01
Smallcellsforumforjason 150318164026-conversion-gate01Smallcellsforumforjason 150318164026-conversion-gate01
Smallcellsforumforjason 150318164026-conversion-gate01
 
Hwlte rf-optimization-guide-140704020836-phpapp02
Hwlte rf-optimization-guide-140704020836-phpapp02Hwlte rf-optimization-guide-140704020836-phpapp02
Hwlte rf-optimization-guide-140704020836-phpapp02
 
Introduction to-telecommunication-rf
Introduction to-telecommunication-rfIntroduction to-telecommunication-rf
Introduction to-telecommunication-rf
 
Drivetest training znix team
Drivetest training znix teamDrivetest training znix team
Drivetest training znix team
 
Wcdmaphysicallayer 111120031701-phpapp02
Wcdmaphysicallayer 111120031701-phpapp02Wcdmaphysicallayer 111120031701-phpapp02
Wcdmaphysicallayer 111120031701-phpapp02
 
2gcaseanalsyishandover training
2gcaseanalsyishandover training2gcaseanalsyishandover training
2gcaseanalsyishandover training
 
Basic gsm ok
Basic gsm okBasic gsm ok
Basic gsm ok
 
Rf bts configurations v1
Rf bts configurations v1Rf bts configurations v1
Rf bts configurations v1
 
Cluster optimization procedure v1
Cluster optimization procedure v1Cluster optimization procedure v1
Cluster optimization procedure v1
 
Case analysis call drop
Case analysis call dropCase analysis call drop
Case analysis call drop
 
Wcdma channels
Wcdma channelsWcdma channels
Wcdma channels
 
Huawei umts o&m planning and configuration
Huawei umts o&m planning and configurationHuawei umts o&m planning and configuration
Huawei umts o&m planning and configuration
 
49529487 abis-interface
49529487 abis-interface49529487 abis-interface
49529487 abis-interface
 
Basic gsm ok
Basic gsm okBasic gsm ok
Basic gsm ok
 
Rf bts configurations v1
Rf bts configurations v1Rf bts configurations v1
Rf bts configurations v1
 
Rf radio parameters
Rf radio parametersRf radio parameters
Rf radio parameters
 

Recently uploaded

Introduction to Serverless with AWS Lambda in C#.pptx
Introduction to Serverless with AWS Lambda in C#.pptxIntroduction to Serverless with AWS Lambda in C#.pptx
Introduction to Serverless with AWS Lambda in C#.pptxBrandon Minnick, MBA
 
Journey of Television in World & in India
Journey of Television in World & in IndiaJourney of Television in World & in India
Journey of Television in World & in IndiaAdarshAgarwal66
 
2) Presentation_Overview_ISO_16140-3_Method_verification_20210322.pptx
2) Presentation_Overview_ISO_16140-3_Method_verification_20210322.pptx2) Presentation_Overview_ISO_16140-3_Method_verification_20210322.pptx
2) Presentation_Overview_ISO_16140-3_Method_verification_20210322.pptxssuser796efb
 
AUGMENTED REALITY (AR) IN DAILY LIFE: EXPANDING BEYOND GAMING
AUGMENTED REALITY (AR) IN DAILY LIFE: EXPANDING BEYOND GAMINGAUGMENTED REALITY (AR) IN DAILY LIFE: EXPANDING BEYOND GAMING
AUGMENTED REALITY (AR) IN DAILY LIFE: EXPANDING BEYOND GAMINGLiveplex
 
Enhancing SaaS Performance: A Hands-on Workshop for Partners
Enhancing SaaS Performance: A Hands-on Workshop for PartnersEnhancing SaaS Performance: A Hands-on Workshop for Partners
Enhancing SaaS Performance: A Hands-on Workshop for PartnersThousandEyes
 
Microsoft Azure News - Feb 2024
Microsoft Azure News - Feb 2024Microsoft Azure News - Feb 2024
Microsoft Azure News - Feb 2024Daniel Toomey
 
Z-Wave Fan coil Thermostat Heltun_HE-HT01_User_Manual.pdf
Z-Wave Fan coil Thermostat Heltun_HE-HT01_User_Manual.pdfZ-Wave Fan coil Thermostat Heltun_HE-HT01_User_Manual.pdf
Z-Wave Fan coil Thermostat Heltun_HE-HT01_User_Manual.pdfDomotica daVinci
 
Semiconductor Review Magazine Feature.pdf
Semiconductor Review Magazine Feature.pdfSemiconductor Review Magazine Feature.pdf
Semiconductor Review Magazine Feature.pdfkeyaramicrochipusa
 
2024 February Patch Tuesday
2024 February Patch Tuesday2024 February Patch Tuesday
2024 February Patch TuesdayIvanti
 
Manual sensor Zigbee 3.0 MOES ZSS-X-PIRL-C
Manual  sensor Zigbee 3.0 MOES ZSS-X-PIRL-CManual  sensor Zigbee 3.0 MOES ZSS-X-PIRL-C
Manual sensor Zigbee 3.0 MOES ZSS-X-PIRL-CDomotica daVinci
 
Unlocking the Cloud's True Potential: Why Multitenancy Is The Key?
Unlocking the Cloud's True Potential: Why Multitenancy Is The Key?Unlocking the Cloud's True Potential: Why Multitenancy Is The Key?
Unlocking the Cloud's True Potential: Why Multitenancy Is The Key?GleecusTechlabs1
 
Quinto Z-Wave Heltun_HE-RS01_User_Manual_B9AH.pdf
Quinto Z-Wave Heltun_HE-RS01_User_Manual_B9AH.pdfQuinto Z-Wave Heltun_HE-RS01_User_Manual_B9AH.pdf
Quinto Z-Wave Heltun_HE-RS01_User_Manual_B9AH.pdfDomotica daVinci
 
zigbee motion sensor user manual NAS-PD07B2.pdf
zigbee motion sensor user manual NAS-PD07B2.pdfzigbee motion sensor user manual NAS-PD07B2.pdf
zigbee motion sensor user manual NAS-PD07B2.pdfDomotica daVinci
 
AWS reInvent 2023 recaps from Chicago AWS user group
AWS reInvent 2023 recaps from Chicago AWS user groupAWS reInvent 2023 recaps from Chicago AWS user group
AWS reInvent 2023 recaps from Chicago AWS user groupAWS Chicago
 
M.Aathiraju Self Intro.docx-AD21001_____
M.Aathiraju Self Intro.docx-AD21001_____M.Aathiraju Self Intro.docx-AD21001_____
M.Aathiraju Self Intro.docx-AD21001_____Aathiraju
 
Q1 Memory Fabric Forum: Advantages of Optical CXL​ for Disaggregated Compute ...
Q1 Memory Fabric Forum: Advantages of Optical CXL​ for Disaggregated Compute ...Q1 Memory Fabric Forum: Advantages of Optical CXL​ for Disaggregated Compute ...
Q1 Memory Fabric Forum: Advantages of Optical CXL​ for Disaggregated Compute ...Memory Fabric Forum
 
DNA LIGASE BIOTECHNOLOGY BIOLOGY STUDY OF LIFE
DNA LIGASE BIOTECHNOLOGY BIOLOGY STUDY OF LIFEDNA LIGASE BIOTECHNOLOGY BIOLOGY STUDY OF LIFE
DNA LIGASE BIOTECHNOLOGY BIOLOGY STUDY OF LIFEandreiandasan
 
Breaking Barriers & Leveraging the Latest Developments in AI Technology
Breaking Barriers & Leveraging the Latest Developments in AI TechnologyBreaking Barriers & Leveraging the Latest Developments in AI Technology
Breaking Barriers & Leveraging the Latest Developments in AI TechnologySafe Software
 
Tete thermostatique Zigbee MOES BRT-100 V2.pdf
Tete thermostatique Zigbee MOES BRT-100 V2.pdfTete thermostatique Zigbee MOES BRT-100 V2.pdf
Tete thermostatique Zigbee MOES BRT-100 V2.pdfDomotica daVinci
 

Recently uploaded (20)

Introduction to Serverless with AWS Lambda in C#.pptx
Introduction to Serverless with AWS Lambda in C#.pptxIntroduction to Serverless with AWS Lambda in C#.pptx
Introduction to Serverless with AWS Lambda in C#.pptx
 
Journey of Television in World & in India
Journey of Television in World & in IndiaJourney of Television in World & in India
Journey of Television in World & in India
 
2) Presentation_Overview_ISO_16140-3_Method_verification_20210322.pptx
2) Presentation_Overview_ISO_16140-3_Method_verification_20210322.pptx2) Presentation_Overview_ISO_16140-3_Method_verification_20210322.pptx
2) Presentation_Overview_ISO_16140-3_Method_verification_20210322.pptx
 
AUGMENTED REALITY (AR) IN DAILY LIFE: EXPANDING BEYOND GAMING
AUGMENTED REALITY (AR) IN DAILY LIFE: EXPANDING BEYOND GAMINGAUGMENTED REALITY (AR) IN DAILY LIFE: EXPANDING BEYOND GAMING
AUGMENTED REALITY (AR) IN DAILY LIFE: EXPANDING BEYOND GAMING
 
Enhancing SaaS Performance: A Hands-on Workshop for Partners
Enhancing SaaS Performance: A Hands-on Workshop for PartnersEnhancing SaaS Performance: A Hands-on Workshop for Partners
Enhancing SaaS Performance: A Hands-on Workshop for Partners
 
Microsoft Azure News - Feb 2024
Microsoft Azure News - Feb 2024Microsoft Azure News - Feb 2024
Microsoft Azure News - Feb 2024
 
COE AI Lab Universities
COE AI Lab UniversitiesCOE AI Lab Universities
COE AI Lab Universities
 
Z-Wave Fan coil Thermostat Heltun_HE-HT01_User_Manual.pdf
Z-Wave Fan coil Thermostat Heltun_HE-HT01_User_Manual.pdfZ-Wave Fan coil Thermostat Heltun_HE-HT01_User_Manual.pdf
Z-Wave Fan coil Thermostat Heltun_HE-HT01_User_Manual.pdf
 
Semiconductor Review Magazine Feature.pdf
Semiconductor Review Magazine Feature.pdfSemiconductor Review Magazine Feature.pdf
Semiconductor Review Magazine Feature.pdf
 
2024 February Patch Tuesday
2024 February Patch Tuesday2024 February Patch Tuesday
2024 February Patch Tuesday
 
Manual sensor Zigbee 3.0 MOES ZSS-X-PIRL-C
Manual  sensor Zigbee 3.0 MOES ZSS-X-PIRL-CManual  sensor Zigbee 3.0 MOES ZSS-X-PIRL-C
Manual sensor Zigbee 3.0 MOES ZSS-X-PIRL-C
 
Unlocking the Cloud's True Potential: Why Multitenancy Is The Key?
Unlocking the Cloud's True Potential: Why Multitenancy Is The Key?Unlocking the Cloud's True Potential: Why Multitenancy Is The Key?
Unlocking the Cloud's True Potential: Why Multitenancy Is The Key?
 
Quinto Z-Wave Heltun_HE-RS01_User_Manual_B9AH.pdf
Quinto Z-Wave Heltun_HE-RS01_User_Manual_B9AH.pdfQuinto Z-Wave Heltun_HE-RS01_User_Manual_B9AH.pdf
Quinto Z-Wave Heltun_HE-RS01_User_Manual_B9AH.pdf
 
zigbee motion sensor user manual NAS-PD07B2.pdf
zigbee motion sensor user manual NAS-PD07B2.pdfzigbee motion sensor user manual NAS-PD07B2.pdf
zigbee motion sensor user manual NAS-PD07B2.pdf
 
AWS reInvent 2023 recaps from Chicago AWS user group
AWS reInvent 2023 recaps from Chicago AWS user groupAWS reInvent 2023 recaps from Chicago AWS user group
AWS reInvent 2023 recaps from Chicago AWS user group
 
M.Aathiraju Self Intro.docx-AD21001_____
M.Aathiraju Self Intro.docx-AD21001_____M.Aathiraju Self Intro.docx-AD21001_____
M.Aathiraju Self Intro.docx-AD21001_____
 
Q1 Memory Fabric Forum: Advantages of Optical CXL​ for Disaggregated Compute ...
Q1 Memory Fabric Forum: Advantages of Optical CXL​ for Disaggregated Compute ...Q1 Memory Fabric Forum: Advantages of Optical CXL​ for Disaggregated Compute ...
Q1 Memory Fabric Forum: Advantages of Optical CXL​ for Disaggregated Compute ...
 
DNA LIGASE BIOTECHNOLOGY BIOLOGY STUDY OF LIFE
DNA LIGASE BIOTECHNOLOGY BIOLOGY STUDY OF LIFEDNA LIGASE BIOTECHNOLOGY BIOLOGY STUDY OF LIFE
DNA LIGASE BIOTECHNOLOGY BIOLOGY STUDY OF LIFE
 
Breaking Barriers & Leveraging the Latest Developments in AI Technology
Breaking Barriers & Leveraging the Latest Developments in AI TechnologyBreaking Barriers & Leveraging the Latest Developments in AI Technology
Breaking Barriers & Leveraging the Latest Developments in AI Technology
 
Tete thermostatique Zigbee MOES BRT-100 V2.pdf
Tete thermostatique Zigbee MOES BRT-100 V2.pdfTete thermostatique Zigbee MOES BRT-100 V2.pdf
Tete thermostatique Zigbee MOES BRT-100 V2.pdf
 

Sdcch drop rate

  • 1. Knowledge sharing sessions SDCCH Drop Rate BENAIAD Abdellah Overview Used Tools Technical Procedure Flow Chart Exemples
  • 2. SDCCH SDCCH Drop Rate Assignment on SDCCH Overview This chapter is designed to provide an overview of root cause analysis for SDCCH drop rate KPI. It addresses the SDCCH drop rate analysis, investigation procedures and troubleshooting techniques to degrade the effect of this issue. 05/08/2015 SDCCH Drop Rate Introduction Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 3. Overview SDCCH is a bidirectional logical channel used in different ways: -Registration: periodic location update, IMSI attach/detach. -Call setup: immediate assignment. -SMS to/from MS in dedicated mode. 05/08/2015 SDCCH Drop Rate Introduction SDCCH Drop Rate Assignment on SDCCH SDCCH Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 4. Overview Request and allocation of SDCCH: 05/08/2015 SDCCH Drop Rate Introduction SDCCH SDCCH Drop Rate Assignment on SDCCH Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 5. Ch Activation Acknowledge Immediate assignment command Immediate assignment Channel required RACH PCH Channel request Paging request Paging command 05/08/2015 SDCCH Drop Rate BSC BTS MS MS C Paging Channel Activation Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 6. Overview SDCCH Drop Rate is a KPI which largely decides the subscriber service quality , the existing KPI formula is listed below: (C10602+C10604+C10605+C10646+C10653+C10601+C10603+C10606)*100 (C11644+C11646) 05/08/2015 SDCCH Drop Rate Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 7. Overview It represents the number of call drops due to contact loss between RMM and Service Management Module (SMM) on SDCCH. 05/08/2015 SDCCH Drop Rate C10602 Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate C10603 C10604 C10605 C10603 C10604 C10605C10605 C10606 C10646 C10653 C11644 C11646 Used ToolOverview Flow Chart ExamplesTechnical procedure C10601
  • 8. Overview It represents the number of call drops due to radio link failure on SDCCH. 05/08/2015 SDCCH Drop Rate C10603 C10604 C10605 Introduction SDCCH Assignment on SDCCH C10601 C10603 C10604 C10605 SDCCH Assignment on SDCCH C10602 SDCCH Drop Rate C10605 C10606 C10646 C10653 C11644 C11646 Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 9. Overview It represents the number of call drops due to LAPD link failure on SDCCH. 05/08/2015 SDCCH Drop Rate C10601 C10604 C10605 C10606 C10646 C10653 C11644 C11646 C10602 Introduction SDCCH Assignment on SDCCH C10603 SDCCH Drop Rate Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 10. Overview It represents the number of call drops due to SDCCH forced release. 05/08/2015 SDCCH Drop Rate C10601 C10603 C10605 C10606 C10646 C10653 C11644 C11646 C10602 Introduction SDCCH Assignment on SDCCH C10604 SDCCH Drop Rate Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 11. Overview It represents the number of call drops due to force release from high priority calls on SDCCH. BSC receives force release message from BTS for high priority calls and counter increments. 05/08/2015 SDCCH Drop Rate C10601 C10603 C10604 C10606 C10646 C10653 C11644 C11646 C10602 Introduction SDCCH Assignment on SDCCH C10605 SDCCH Drop Rate Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 12. Overview It represents the number of call drops on SDCCH due to other causes. 05/08/2015 SDCCH Drop Rate C10601 C10603 C10604 C10605 C10646 C10653 C11644 C11646 C10602 Introduction SDCCH Assignment on SDCCH C10606 SDCCH Drop Rate Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 13. Overview It represents the total number of call drops due to handover failure on SDCCH, this counter is not allowed. 05/08/2015 SDCCH Drop Rate C10601 C10603 C10604 C10605 C10606 C10653 C11644 C11646 C10602 Introduction SDCCH Assignment on SDCCH C10646 SDCCH Drop Rate Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 14. Overview It represents the total number of SDCCH call drops (short message). 05/08/2015 SDCCH Drop Rate C10601 C10603 C10604 C10605 C10606 C10646 C11644 C11646 C10602 Introduction SDCCH Assignment on SDCCH C10653 SDCCH Drop Rate Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 15. 05/08/2015 SDCCH Drop Rate C10601 C10603 C10604 C10605 C10606 C10646 C10653 C11646 C10602 Introduction SDCCH Assignment on SDCCH Overview C11644 SDCCH Drop Rate Number of successful SDCCH assignments. Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 16. Overview Number of successful SDCCH handovers. 05/08/2015 SDCCH Drop Rate C10601 C10603 C10604 C10605 C10606 C10646 C10653 C11644 C10602 Introduction SDCCH Assignment on SDCCH Used ToolOverview Flow Chart Examples C11646 Technical procedure SDCCH Drop Rate
  • 17. 05/08/2015 SDCCH Drop Rate Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 18. Used Tools which can be used for accessing different performance statistics, creating queries, setting up reports, creating variables and using the Business Objects functions to analyze the data in the reports. 05/08/2015 SDCCH Drop Rate MCOM 4.2 ZXG10 OMCR TEMS Investigation Business Objects 6.5 Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 19. Used Tools This tool is used to know the type of interference (Co- channel interference or adjacent interference) between cells; and the value of tilt, azimuth and height of the cell. 05/08/2015 SDCCH Drop Rate Business Objects 6.5 ZXG10 OMCR TEMS Investigation MCOM 4.2 Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 20. Used Tools which can be used to provide access to all the available support activities for Operations and Maintenance in the radio and core networks, besides, the accessibility to Configuration Management, Fault management and Performance management 05/08/2015 SDCCH Drop Rate Business Objects 6.5 MCOM 4.2 TEMS Investigation ZXG10 OMCR Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 21. Used Tools Ericsson’s tool which is used to analyze drive tests on the downlink level. 05/08/2015 SDCCH Drop Rate Business Objects 6.5 MCOM 4.2 ZXG10 OMCR TEMS Investigation Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 22. Technical Procedure The following are main causes for SDCCH drop rate: SDCCH Drops Due connection loss RMM SMM. SDCCH Drops Due Radio Failure. SDCCH Drops Due LAPD Failure. SDCCH Drops Due OMC Forced release SDCCH Drops Due Preemption. SDCCH Drops Due Others . SDCCH Drops Due Handover Failure. SDCCH Drops SMS (according to the formula of SDCCH Drop Rate). 05/08/2015 SDCCH Drop Rate SDCCH Drop Reasons troubleshooting SDCCH Drop causes Used ToolOverview Flow Chart ExamplesTechnical Procedure
  • 23. Technical Procedure The following are main causes for SDCCH drop rate: SDCCH Drops Due connection loss RMM SMM. SDCCH Drops Due Radio Failure. SDCCH Drops Due LAPD Failure. SDCCH Drops Due OMC Forced release . SDCCH Drops Due Preemption . SDCCH Drops Due Others . SDCCH Drops Due Handover Failure. SDCCH Drops SMS. 05/08/2015 SDCCH Drop Rate troubleshooting SDCCH Drop causes Used ToolOverview Flow Chart Examples SDCCH Drop Reasons Technical Procedure
  • 24. Technical Procedure The following are reasons of Radio SDCCH drop: 1. There exists weak coverage area, and radio signal is weak too. 2.There exists interference, such as intra-network interference due to unreasonable frequency planning, and other external interference, etc. 3.Unreasonable radio parameter setting 4.Equipment hardware fault, such as low output power of the power amplifier, large difference among different carrier transmission power, carrier transmitter fault, combiner fault, etc. 05/08/2015 SDCCH Drop Rate troubleshooting LAPD SDDCH Drop SDCCH Drop types Used ToolOverview Flow Chart Examples RADIO link loss Technical Procedure SDCCH Drop Reasons
  • 25. Technical Procedure 5.Antenna feeder system fault. For example, VSWR of antenna feeder is big; antenna is too high or lower inclination is unreasonable, which causes too big the coverage range or cross-cell coverage, and forms the remote isolated island effect; etc. 05/08/2015 SDCCH Drop Rate troubleshooting LAPD SDDCH Drop SDCCH Drop types Used ToolOverview Flow Chart Examples RADIO link loss SDCCH Drop Reasons Technical Procedure
  • 26. Technical Procedure The following are reasons of LAPD SDCCH drop: 1.Site transmission problems, such as transmission interruption or unstable transmission . 2.Site hardware fault, such as unreliable E1 cable, CMM fault, etc. 3.BSC hardware fault. 05/08/2015 SDCCH Drop Rate troubleshooting RADIO link loss LAPD SDDCH Drop SDCCH Drop types SDCCH Drop Reasons Used ToolOverview Flow Chart ExamplesTechnical Procedure
  • 27. Technical Procedure SDCCH Drop rate analysis troubleshooting procedure: 1. SDCCH availability. 2. SDCCH Drop causes. 3. Basic NMS to know which TRX might be faulty. 4. Alarms. 5. BTS measurement and cell measurement. 6. Data base parameter. 7. Drive testing and site audit. 05/08/2015 SDCCH Drop Rate SDCCH Drop Reasons troubleshooting SDCCH Drop types Used ToolOverview Flow Chart ExamplesTechnical Procedure
  • 28. Flow Chart It is advised to locate the problem by checking radio parameters together with hardware troubleshooting. The flow of handling SDCCH drop is shown below: 05/08/2015 SDCCH Drop Rate Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 29. Is there HW problem (cell/TRX/TS )? Open TT to BSS team Check SDCCH availability SDCCH Drop Rate high certain cell Start yes yes No Reset cell Is there LAPD problem? Open TT to BSS team yes yes No No *
  • 30. RF problems Whether radio parameter are set reasonably Whether interference exist Is there LAPD problem? * Open TT to BSS team yes No Modify unreasonable parameters yes No yes No Trouble shoot interference **
  • 31. Whether fault exist in coverage Trouble shoot coverage yes No Whether fault exist in equipment HW Whether fault exist in antenna feeder system Troubleshoot equipment fault yes No Trouble shoot antenna feeder fault yes No *** Whether the SDCCH Drop Rate persist restart the investigation yes No END
  • 32. Exemples 22685A: by checking data base stat, we notice a high SDCCH Drop Rate on the site. Problem Description: using ZXG10 OMCR tool, the problem is a PA power alarm (hardware problem). Action Taken: open TT to BSS team to solve the PA power alarm. 05/08/2015 SDCCH Drop Rate Used ToolOverview Radio Problem LAPD Problem Flow Chart Examples Hardwar Problem Technical procedure
  • 33. Exemples 03102A: Problem Description: Co-channel interference on the BCCH of 03102A Action Taken: Changing the BCCH frequency from:108-->89 22685A: Problem Description: 22685A of BSCSBA2 (BSC04) is having PA Output Power alarm on TRX1 Action Taken: Replacing the faulty TRX 05/08/2015 SDCCH Drop Rate LAPD Problem Hardwar Problem Used ToolOverview Flow Chart ExamplesTechnical procedure Radio Problem
  • 34. Exemples 03663A: Problem Description: Transmission disconnection problem on the A-bis interface Action Taken: Fixing the TXM problem 05/08/2015 SDCCH Drop Rate Radio Problem LAPD Problem Hardwar Problem Used ToolOverview Flow Chart ExamplesTechnical procedure
  • 35. Reference [10] sjzl20062303-ZXG10-BSS (V2.97) Operation Manual (Radio Parameters) GBO_014_E1_0 Special Topic of Radio Network Optimization-82 GBC_004_E1_0 Radio parameters -50 ZTE Statistics 05/08/2015 SDCCH Drop Rate References list
  • 37. 05/08/2015 SDCCH Drop Rate DRT/EDRT The DRT/EDRT fulfills conversion between voice codes at the GSM radio interface and the PSTN A-law PCM voice codes in the BSC, and implements rate adaptation (including data services rate adaptation) between them. DRT: Dual-rate transcoder, realizing the transcoding service processing. It can process 126 FRs or 32 EFRs at most. EDRT (C62): Enhanced dual-rate transcoder, an enhanced version of the DRT board. It can process 126 FRs or 126 EFRs at most. EDRT (C64): Enhanced dual-rate transcoder, an enhanced version of the DRT board. It can process 126 FRs, 126 EFRs or 126 HRs at most. Functions and Principles The board has the following functions.  Performs the transcoding and rate adaptation function: It converts the 260-bit vocoder block into one hundred and sixty 8-bit A-law PCM sample signals, and vice versa. Performs framing and vocoder block synchronization, detect voice activation, regulate the block phase in the downlink direction to minimize delay, send alarms to BSC by passing through BTS through in-band signaling, processes data blocks in compliance with the protocol standard rate adaptation and re-assorting them following the A interface requirements.  Provide physical-layer functions of the digital trunk interface.  Separates signals, SS7 links pass transparently, and the service channels pass through the DSP for processing.  Has the HDLC channels communicating directly with the, facilitating O & M Center. Fig 3.18-1 shows the DRT/EDRT board organizational diagram. DRT uses eight DSPs, EDRT (C62) uses six, and EDRT (C64) uses two. In the given figure, n = 8, 6, 2 respectively. The DRT/EDRT comprises the DSP, CPU, and switching circuits. The DSP is responsible for mass calculations, implementing the conversion between radio service channels and ground service channels. It is the core of the DRT/EDRT board. Fig 3.18-1 DRT/EDRT Board Organizational Diagram HDLC CPU HPI DSPn DSP4 DSP3 DSP 2 DSP 1 A Abis . . . . . . S w itching circuit DRT/EDRT Board Fault Fault Symptom DSP is faulty or communication with the corresponding TCPP is disconnected. Fault Cause Analysis Communication between TCPP and DRT/EDRT is faulty. Hardware of the TCPP board is faulty. DSP on the DRT/EDRT board is faulty. Troubleshooting Perform the following steps to troubleshoot the fault: 1. Check whether the corresponding TCPP board is faulty. If it is faulty, troubleshoot the TCPP board fault first. 2. If the DSP is faulty, then go to step 6. 3. Check whether there is any clock loss alarm from this board. If there is, then reset and unplug/plug the relevant board. 4. Check whether the backplane connection cable is loose or modified. 5. Check whether the foreground and background data are consistent and whether relevant data are configured. 6. Download the DRT and EDRT versions again and reset the board. 7. Replace the DRT/EDRT board. If the fault still remains, plug the board to another slot. Precautions Be sure to wear an antistatic wrist strap when touching a board or component. Appendix
  • 38. Radio parameters setting Cell’s minimum access level: which causes SDCCH drop in weak coverage area. Unreasonable BSIC setting Unreasonable power control setting, such as unreasonable level, quality power control threshold, which will cause MS to reduce power even in the case of weak signal and poor call quality. () Unreasonable FH parameter setting: parameter setting Unreasonable MAIO configuration will cause co-channel interference and adjacent-channel interference within one site. Incomplete adjacent-cell data definition or configuration error Congestion exists in adjacent cell 05/08/2015 SDCCH Drop Rate Radio parameters