1. Bharti Quality Workshop-3G_KPI-Kolkata

Soc Classification level

1 © Nokia Siemens Networks Presentation / Author / Date

3G KPIs


2 © Nokia Siemens Networks

Contents

• KPI Introduction

– Call Setup in 3G from KPI perspective

• KPIs impacting End User Perception

– Insight into few critical KPIs

• 3G KPIs in MAPA

• HSDPA Throughput: Key factors impacting End User

• Discussions….



Overview of 3G KPI

NodeB

RNC 3G MSC

3G SGSN

GGSN Firewall

FMT

GPRS

Backbone

Internet

PS data

server

PSTN

CS data

server

Modem

Field Measurement KPI

RAN KPI

Core Network KPI

End-to-End KPI

The NSN 3G KPI can be classified as below :



RAN KPI Classification

The RAN KPI can be classified into the following categories

• Accessibility

• Retainability

• Mobility

• Usage

• Throughput

BS

RNC 3G MSC

3G SGSN

GGSN Firewall

FMT

GPRS

Backbone

Internet

PS data

server

PSTN

CS data

server

Modem

RAN KPI



CN DRNC UE SRNC WBTS

2. RRC connection set-up

5. Service Established

6. Branch addition/deletion & Active set update

1. Cell search, BCCH decoding & RACH access

3. UE <--> CS-CN signalling

4. RAB set-up

7. Service Released

AMR CS Call Phases

Accessibility: RRC Setup & Access Rate RAB Setup & Access Rate Call Setup Success Rate

Retainability: RAB Drop Rate

Mobility: SHO Success Rate



DRNC UE CN SRNC WBTS

2. RRC connection setup

6. PS Data Session Established

8. Branch addition/deletion & Active set update

1. Cell search, BCCH decoding & RACH access

3. Attach

4. RAB set-up

9. PS Data Session Released

5. UE <--> PS-CN Signalling (PDP Context Activation Accept)

Same as for AMR call

7. State Transitions

PS Call Phases

Accessibility: RRC Setup & Access Rate RAB Setup & Access Rate Call Setup Success Rate

Retainability: RAB Drop Rate

Mobility: SHO Success Rate



UE

RRC: Connection Request

RRC Connection Setup phase Resource Reservation in RNC, BTS, Transmission

RRC: RRC Connection Request Setup

RRC Connection Access phase RNC waits reply from UE

RRC: RRC Connection Completed

RRC: Initial Direct Transfer cm service request

RANAP: Initial UE Message

DIRECT TRANSFER (Call Proceeding)

RANAP: RAB Assignment Request

RRC: Radio Bearer Set-up

RRC: Radio Bearer Setup Complete

RAB Connection Setup phase Resource Reservation in RNC, BTS, Transmission

RANAP: RAB Assignment Response DIRECT TRANSFER (Alerting)

BTS RNC CN

DIRECT TRANSFER (Connect)

DIRECT TRANSFER (Connect Acknowledge)

RAB Connection Access phase RNC waits reply from UE

Call Set-up

Success Rate

Call Set-up Time

Definition of Call Set-Up Success Rate (CSSR)



3G KPIs

Accessibility Voice Call Setup Success Rate

Video Call Setup Success Rate

PS Call Setup Success Rate

HSDPA Accessibility

HSUPA Accessibility

Retainability Voice Drop Call Rate

Video Drop Call Rate

PS Drop Call Rate

HSDPA Retainability

HSUPA Retainability

Mobility RT SHO Success Rate

NRT SHO Success Rate

3G-2G RT ISHO Success Rate

3G-2G NRT ISHO Success Rate

Usage CE Utilization

Iub Usage

Code Utilisation

Power Utilisation

Service Quality HSDPA Cell Throughput

Cell Availability

Should be used as monitoring PI to proactively upgrade capacity before failures occur



Insight into 3G KPIs



Accessibility: Voice and Video CSSR

Def: Ratio between successfully established CS voice/video calls compared to the overall number of voice/Video call establishment attempts

attempts call ofNumber

setups call successful ofNumber CSSR

attempts) RAB Voice (Total

) Allocation RAB Voice CS l(Successfu*Rate) Completion Access and Setup RRC (CS CSSR



Accessibility: PS CSSR

Def: PS Setup Success Rate is the ratio between successfully allocated PS NRT RAB compared to the number PS call attempts

Attempts) Call PS (Total

Setup) CAll PS l(Successfu CSSR PS

attempts) RAB NRT PS (Total

)Allocation RAB NRT PS l(Successfu*Rate) Completion Access and Setup RRC (PS CSSR



Retainability: Voice and Video Drop Call Rate

Def: Ratio between Dropped voice/video calls and the overall number of established voice calls

calls) Video / Voice Release Normal of No. calls drop / video voiceof No. (

) calls drop / video voiceof No. ( DCR



Retainability: PS Call Drop Rate

Def: Ratio between the number of PS call drops compared to the overall number of call drops and normal release of PS calls.

calls) NRT PS Release Normal of No. calls drop NRT PS of No. (

) calls drop NRT PS of No. ( DCR PS



Mobility: RT & NRT SHO Success Rate

Def: RT (or NRT) Soft Handover Success Rate means branch addition, branch deletion or branch replacement for RT (or NRT) traffic over the reporting period in the Source Cell.

It is ratio between successful Active set updates compared to initial addition /Replacement /Deletion requests for RT (or NRT) traffic

100%RT)for Request Set Update Active (Total

RT)for Set Update Active l(Successfu Rate Success SHO RT

100%NRT)for Request Set Update Active (Total

NRT)for Set Update Active l(Successfu Rate Success SHO NRT



Mobility: 3G-2G Intersystem Handover Success Rate

Def. Ratio between number of GSM layer 3 HANDOVER COMPLETE messages and the number of RRC HANDOVER FROM UTRAN messages

Attempts ISHO ofNumber

ISHOs successful ofNumber SR ISHO RT 2G-3G

UE RNC

RRC: Handover from UTRAN command

Handover Detect

Attempt Attempt

Success Handover Complete

BSC CN



Relevant 3G KPIs in MAPA



3G KPIs in MAPA



Monitoring KPIs

Accessibility Voice Call Setup Success Rate

Video Call Setup Success Rate

PS Call Setup Success Rate

HSDPA Accessibility

HSUPA Accessibility

Retainability Voice Drop Call Rate

Video Drop Call Rate

PS Drop Call Rate

HSDPA Retainability

HSPA Retainability

Mobility RT SHO Success Rate

NRT SHO Success Rate

3G-2G RT ISHO Success Rate

3G-2G NRT ISHO Success Rate


Iub Usage

OVSF Utilisation

Power Utilisation

Service Quality HSDPA Cell Throughput

Cell Availability

Should be used as monitoring PI to proactively upgrade capacity before failures occur



Capacity Utilization in 3G MAPA


Iub Usage

Code Utilisation

Power Utilisation



HSDPA Throughput

Presentation / Author / Date



HSDPA Throughput

Some of the crucial factors impacting HSDPA throughput

• User throughput dependent on device capabilities (3gpp UE category definition: Max throughput capability varies from 1.8 Mbps to 21 Mbps)

• User throughput dependent on number of simultaneous active users in the cell: Higher the simultaneous active users, lower the throughput (HSDPA is a shared channel)

• User throughput varies based on radio conditions and locations

• Application type, usage etc.



UE Perspective : UE Categories

HS-

DSCH

category

max. No. of

HS-DSCH

Codes

min. *

Inter-TTI

interval

Modulation

Dual-

Stream

MIMO

supported

Peak

Rate

1 5 3 (6 ms) QPSK/16QAM No 1.2 Mbps

2 5 3 QPSK/16QAM No 1.2 Mbps





7 10 1 QPSK/16QAM No 7 Mbps




11 5 2 QPSK only No 1 Mbps

12 5 1 QPSK only No 1.8 Mbps

13 15 1 QPSK/16QAM/ 64QAM

No 17.4 Mbps

14 15 1 QPSK/16QAM/ 64QAM

No 21.1 Mbps

15 15 1 QPSK/16QAM Yes 23.4 Mbps

16 15 1 QPSK/16QAM Yes 28 Mbps

17 15 1 QPSK/16QAM/ 64QAM or Dual-Stream MIMO

17.4 or 23.4 Mbps

18 15 1 QPSK/16QAM/ 64QAM or Dual-Stream MIMO

21.1 or 28 Mbps

Commonly used UEs



UE Capabilities in Mumbai 3G Network

~20% Only R99 Capable

~80% HSDPA Capable



Mumbai PS Data Traffic: R99, HSPA

• 95% of PS Traffic from HSPA

• Close to 90% from HSDPA only



UE Capabilities in Bihar 3G Network

•Close to 20 % R99 Capable

•~80% HSDPA Capable

• UE capabilities similar to Mumbai 3G NW



PS Data Traffic in Bihar 3G Network

• UE capabilities same as in Mum

• HSPA contribution is ~95%



UE Capabilities in WB 3G Network

~23% Only R99 Capable

~77% HSDPA Capable

Not significant difference

In terms of HSDPA capable

devices



PS Data Traffic in WB 3G Network

• 23% of R99 capable handsets ( 3-5% higher than MUM, BH)

• Contribution by R99 traffic is Higher in WB ( ~ 15% Higher than MUM, BH)

• HSPA Traffic contribution is ~80%

• Overall Traffic is much less as compared to MUM and BH



HSDPA Throughput: Simultaneous User

Device: Max 21Mbps capable dongle

Throughput achieved:

Max: 5.4 Mbps, Avg 5.0 Mbps

*4E1 Site

Device: Sierra Wireless (Max 21Mbps

capable dongle)

No. of simultaneous users at test location: 7

Throughput achieved:

Max: 2Mbps, Avg 1.0 Mbps (7 users)

Max: 3 Mbps, Avg 1.6 Mbps ( 6 users)

*4E1 Site



HSDPA Data Volume and Throughput

• Data Volume varies from ~ 7.5Gbits to ~ 70 Mbits

• Huge variation in Cell Throughput



Quick Summary

• A brief overview of 3G KPIs which have impact on End User Perception

• Significance of KPIs at different stages of call

• UE capabilities in Bharti NW ( Mumbai, WB, Bihar)

• Factors impacting the throughput

• KPIs in Daily MAPA



Questions…

Presentation / Author / Date

Documents

1. Bharti Quality Workshop-3G_KPI-Kolkata