Push to Talk (PTT) Service Assurance...5 Analyze Assure Accelerate TM • As with any new service,...

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Push to Talk (PTT) Service Assurance

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• Introduction

• PTT Probe TechnologyØ Monitoring

Ø Troubleshooting

Ø Performance

• Conclusions

Agenda

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What does a PTT network look like?

RadioAccessNetwork

CDMA2000Call

Core NetworkPTT Server

Functionality

Originating Mobile

RadioAccessNetwork

CDMA2000Call

One or moreTerminating Mobiles

ControlMessaging Control

Messaging

VoicePackets

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What is service assurance?

• Measuring and monitoring theend user experienceØ Probes

• Active Measurement Devices• Passive Measurement Devices

Ø Network Elements• IP Routers• ATM/FR Switches

• Analysis and reporting of the networkØ Performance monitoring and reportingØ Fault management and root cause correlationØ Centralized testing: Automated and on-demand

Centralized OSS

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• As with any new service, it is important to understand and characterize performance metrics that will impact the end user’s perception of quality

• This is particularly important with PTT because an expectation already exists for the quality of this serviceØ PTT compared to existing CDMA circuit-switched voice

service

Ø CDMA VoIP-based PTT compared to existing PTT service using other technology

Why network level service assurance?

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PTT Probe Technology

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PTT Service Assurance

• PTT Probe Technology Ø Probe Device (Sectionalize the Problem)

• Mobile/Fixed• Local/Remote

Ø Centralized OSS

Mobile Probe Stationary Probe

Centralized OSSRadio tower

E2E Service AssuranceE2E Service Assurance

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• The capability to track probes on the network over time

• Status of the network (health)

Ø Periodic updates of probe status

Ø What areas of the network are active?

Ø How healthy is the network?

PTT Monitoring

Centralized OSS

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PTT Monitoring - Analysis

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• The capability to troubleshoot probes on the network

• Remotely answering the question “Why”Ø Air Interface Failure

Ø Access Failure

Ø Network Failure

Ø Registration Failure

Ø Connection Failure

Ø Call Setup Failure

Ø Protocol Failure

Ø Timeout Failure

Ø Busy Failure

PTT Troubleshooting

Centralized OSS

AccessFailure

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PTT Troubleshooting - Analysis

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• The capability to measure performance of probes on the network

• Determines how well the service isperformingØ Registration DelaysØ Call Setup DelaysØ Floor Availability DelaysØ Audio DelaysØ Audio Quality

• PESQ MOS Scoring• Jitter• HOT• FEC

PTT Performance

Centralized OSS

PESQ=Delay=

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PTT Performance - Analysis

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Conclusions

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• Ability to qualify network performance• Ability to baseline the network

Ø Peak hour performance/statisticsØ Off peak hour performance/statistics

• Ability to obtain measurements necessary to optimize performance for PTT services

• Ability to troubleshoot problem areas of the network, remotely

• Ability to analyze and measure the impact of new software releases

Benefits of PTT Probe Network Technology

Assuring Best in Class ServiceAssuring Best in Class Service

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Contact Information

Michael D. Bailey

Group Manager – Development and Deployment Solutions

Spirent Communications, Inc.

michael.bailey@spirentcom.com