“group 0” lei zhang 3421970 zhenyu li 3429940 peng zhou 3429310 xiaohang yin 3434340 mauricio...
TRANSCRIPT
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CROSS-LAYER MONITORING IN IPTV
NETWORKS“Group 0”
Lei Zhang 3421970
Zhenyu Li 3429940
Peng Zhou 3429310
Xiaohang Yin 3434340
Mauricio Barreto 3358630
Nilram Azadpeyma 3371520
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TELE 9752 – Network Operations & Control Group Presentation
Week 12 – S2, 2013
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OUTLINE
Introduction Aims and Challenges - Why Monitoring Metrics - What In-network & Client-side Monitoring – How &
Where The ALICANTE Monitoring Approach Conclusion and Our Opinion
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INTRODUCTION
with guaranteed quality of service – paid service.
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2009 2013
revenuebi l l i on
• Why IPTV business is so attractive?
• IPTV must compete with traditional TV delivery systems.
• Very high reliability and QoS/QoE.
IPTV: Delivery of multimedia content over IP-based networks
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Integrated service &network management Real-time monitoring
• Monitoring must cover all layers in all system segments.
• Cross-layer monitoring is essential!
network
service
content
Traditional TV
content
service
network
IPTV
INTRODUCTION
To achieve comparable QoS/QoE IPTV needs:
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AIMS Hierarchical structure
•A Super Head-end
•Local Video Head-ends
•Core/Edge Networks
•Access Multiplexer
•Customer Gateway
•Presentation Devices
• Outage could be common Internet Access Platform Cellular Phone Network
• Short outage is not tolerable Television Service
Service Assurance for IPTV
Even Small Impairments
should be detected and mitigated.
Figure 1. Typical architecture of an IPTV network. [7]
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REQUIRED FUNCTIONALITIES OF AN IPTV MONITORING SYSTEM
ReactiveResponse of the monitoring system to an
abnormal situation.
ProactiveBehaviour of the monitoring system under
normal operation.
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FUNCTIONS OF MONITORING Reactive (Fault Management)
of service outageDetection • Even packet losses on the order of 0.1% can cause
perceptible distortions to video and audio.
of problemEstimation • Small losses or increased jitter can degrade the perceived
quality.
of the failure pointLocalization • Impact of the problem depends on the point of failure.• Failure in access multiplexer Vs. super head-end.
of the impactAssessment
• Map this event to its actual impact on viewer perceived quality. 7
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Proactive
of failure/outage (P)Prevention• Achieved by checking the resource utilization and the
workload of the system components and identifying system bottlenecks.
of SLA statusDetection
• End-to-end monitoring data can be used.
user behavior (P) Monitoring
• To perform long-term resource planning.• Optimize system operations.
monitoring with other componentsIntegrate• Complete picture of the status.
FUNCTIONS OF MONITORING
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CHALLENGES•Vas
t number of involved devices Huge volume of reports Filter and process
Scalability
•Service delivered may belong to different network operators. Willing to expose network monitoring data? (Not really!)
Monitoring Core, Edge & Access
Networks
•Different management systems
Interoperability
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MONITORING METRICS
Cross-layer Monitoring Parameters monitored in IPTV network:
User/QoE MetricsUser Perception
Application MetricsDuring Decoding and Presentation
Transport/Network MetricsPerformance of the Corresponding Protocols
Other:Protocol-Specific Metrics
FECUser Behavior Metrics
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IN-NETWORK MONITORING Within the Distribution Network, Core, Edge, and Access. Needs to be distinguished from overall network monitoring. Mainly collects:
Transport/Network Metrics e.g. Packet Loss and Jitter
Packet filtering and sampling is often used due to huge traces.
Retrieval of measured metrics: SNMP, IPFIX( Avoid overhead of SNMP/syslog) Modern Routers and Switches
Higher-Layer Metrics Application/Stream Probe Modules
○ Number of Probes: Detection of Issue Vs. Cost and Complexity○ Active Monitoring Imposed Load /Traffic on the Network
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CLIENT-SIDE MONITORING Performed at 3 points:
Customer Network Gateway
Decoder/STB
Presentation Device
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ALICANTE MONITORING
Figure. Architecture of the ALICANTE monitoring subsystem. [ 7 ]13
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QoS & QoE of the ALICANTE
Maximization of QoS and QoE of media services is achieved.
a) via dynamic adaptation of media streams, taking place in the network and also at the edges.
b) via content-aware mechanisms in the network, performing automatic service recognition and differentiation.
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Four sets of cross-layer metrics are identified corresponding to different elements:
Key feature: Decentralized Monitoring.
ALICANTE MONITORING
Metrics Source
Host Metrics Content Server & Home Box
VCAN Metrics Network
Session Metrics Home Box & User Terminals
Application/ QoE Metrics User Terminals
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CONCLUSIONS Thorough monitoring can only be achieved through cross-layer
monitoring.
All domains involved in IPTV service provisioning must be monitored.
The Alicante monitoring approach is a practical implementation of the principles of end to end service monitoring.
Decentralized monitoring allows adaptive management and promotes collaboration among actors and across domains.
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OUR OWN OPINIONS
Lack of experimental support for ideas presented in paper. The paper is more an opinion piece than a research paper.
Conclusions should include: Use of virtual networks allows data to be shared without exposing commercially sensitive information.
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REFERENCES[1] “IPTV Global Forecast — 2009 to 2013, Semiannual IPTV Global Forecast Report,” Nov. 2009, MRG Group Inc.
[2] ITU-T Rec. G.1081, “Performance Monitoring Points for IPTV,” Oct. 2008.
[3] L. Boula, H. Koumaras, and A. Kourtis, “An Enhanced IMS Architecture Featuring Cross-Layer Monitoring and Adaptation Mechanisms,” ICAS ’09), Valencia, Spain, Apr. 20–25, 2009.
[4] ITU-T Rec. G.1080, “Quality of Experience Requirements for IPTV Services,” Dec. 2008.
[5] ITU-T Rec. J.241, “Quality of Service Ranking and Mea- surement Methods for Digital Video Services Delivered over Broadband IP Networks,” Apr. 2005.
[6] ETSI TR 101 290 V1.2.1, “Digital Video Broadcasting (DVB); Measurement Guidelines for DVB Systems,” tech. rep., May 2001.
[7] Boula L, Gardikis G, Xilouris G, et al. Cross-layer Monitoring in IPTV Networks[J].
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