This material is for informational purposes only and subject to change without notice. It describes Ixia’s present plans to develop and make available to its customers certain products, features and functionality. Ixia is only obligated to provide those deliverables specifically included in a written agreement between Ixia and the customer. ©2009 Ixia. All rights reserved.

Network Planning to Ensure Quality of Experience

Network Planning to Ensure Quality of Experience

IP Video TrendsIP Video Trends

Defining video over IP1. Video on the Internet

2. IPTV in the service provider network

3. Video communications

IP Video TrendsIP Video Trends

Coming Soon …

More high definition broadcast

More HD on-demand

New interactive services

Continuous service rollouts

Multiplay ArchitectureMultiplay Architecture

A service provider’s perspective

Multiplay DeliveryMultiplay Delivery

Bandwidth Requirements A typical US home has 3

TV sets 2 SD streams @ 2Mbps

+ 1 HD stream @ 5Mbps + HSI at 5Mbps = 14 Mbps per home

To compete in North America, bandwidth to homes and QoS are key

In other parts of the world, access links of 20 Mbps are simply not available

Source: Metro Ethernet Forum.

Multiplay DeliveryMultiplay Delivery

Channel switching IP networks provide channels “on-request” IGMP performance directly impacts channel change But there are more factors that impact perceived channel

zap speed

Application-Layer ForwardingApplication-Layer Forwarding

ChallengesChallenges

Emulate realistic subscriber behavior• Multiple applications including web, voice-over-IP, video, P2P to

name a few• Application and usage profile over a period of time

Typical Subscriber Pool

%Ba

ndw

idth

Usa

ge

Time

25

50

75

Total BW Usage over Time

Service Profile

Define

For each service or application, create a load profile that will make up the combined usage profile

ChallengesChallenges

Every service has a different customer QoE expectation

Services QoE Expectation Performance AttributesHSI Low –

Best Efforto Variable bandwidth consumptiono Latency & Loss tolerant

Enterprise/Business Services

High – critical data

o High bandwidth consumptiono Highly sensitive to latency o High Security

Peer-to-peer Low – Best Effort

o Very high bandwidth consumptiono Latency & loss tolerant

Voice High – Low latency and jitter

o Low bandwidth – 21-320 Kbps per callo One-way latency < 150mso One-way jitter < 30 ms

IPTV High – Low jitter & extremely low packet loss

o Very high bandwidth consumptiono Very sensitive to packet loss

Mobility Services Moderate – Low packet loss

o Moderate bandwidth consumptiono Highly sensitive to latency

Gaming and Interactive services

High – Low packet loss

o Variable bandwidth consumptiono One-way latency < 150mso One-way jitter < 30 ms

Video TechnologiesVideo Technologies

What is a good quality score?There is no standardized VQSEncoders affect VQ (e.g.)

• HD at 12 Mbps can score lower than a SD at 12 Mbps

• Why? Compression!Scores must reflect absolute and relative scores

MOS_V What does it mean?

5 Excellent

4.5 Very good

4 Good

3.5 Poor

3 Not acceptable

2 Severe

1 Useless

ChallengesChallenges

Model a city-scale of subscribers• Having success in the lab using a controlled and small volume of

traffic does not guarantee success in the field• Must model high volumes of subscribers to understand how well the

service delivery network scales

AveQoS

Time

%ServiceUsage

Time

ChallengesChallenges

Know the user experience• Correlate QoE delivered on a

per-service and per-user basis• Determine subscribers/services

that did not receive defined SLA

• Understand the impact of one service on another as it competes for network resources

• Especially for voice and video services

Quality issues remain a significant challenge for IPTV as the service

grows

Testing RequirementsTesting Requirements

Basic simulation of multiplay traffic

• Real-world testing as part of a comprehensive test plan

Core performance of edge and core routers

• Use real traffic to max throughput of unicast and multicast traffic

Scalability testing of multicast over L2, L3 topologies

• Determine loss, jitter, latency and scalability of overlay topology

Testing RequirementsTesting Requirements

Verify QoS on the provider-edge network

• Complex in nature, modeling of subscriber

traffic is needed

Inter-operability and scalability of VoD server

• Determine throughput, loss, jitter, QoE

Quality of experience (QoE)

• Applicable everywhere in SP and NEMS

methodologies

Testing RequirementsTesting Requirements

Emulate “real” application traffic at 10 Gbps line rate• Voice, video and data• Tens of thousands of clients/servers

Measure performance and QoE• HTTP page delivery• VoIP call setup time• FTP file transfer rate• Consistent, reliable video delivery and quality• Video channel change time• P2P throughput

Negative tests and attack traffic to verify performance effects on other services

Scalability: How many?

Testing RequirementsTesting Requirements

Highly scalable, integrated test solution Assess the performance of multiplay

networks and devices Emulate subscribers with multiplay traffic Ensure quality of experience in a converged

network Provide support for video, voice and data

trafficData (HTTP, FTP, SMTP)

Video (IGMP, MLD, RTSP)

Voice (SIP, MGCP)

Both IPv4 and IPv6

Testing SolutionTesting Solution

Determine quality

Performance benchmarking

Rich tools

This material is for informational purposes only and subject to change without notice. It describes Ixia’s present plans to develop and make available to its customers certain products, features and functionality. Ixia is only obligated to provide those deliverables specifically included in a written agreement between Ixia and the customer. ©2009 Ixia. All rights reserved.

Thank You