Transcript
Managing Residential VoIP and IPTV Services Paul McMenamin VP Product Development, Telchemy
Broadband World Forum, Fall 2006
Triple Play Architecture - VoIP Customer Premises
WiFi phone computer
Trunking Gateway
PSTN
DSL IP
IP phone Analog phone
DSLAM/ B-RAS Residential Gateway
Triple Play Architecture - IPTV Customer Premises Video Content
IP Set Top xDSL computer
IP
DSLAM/ B-RAS
Residential Gateway
Triple Play - Issues and Problems Customer Premises
Server Congestion
Video Content
WiFi phone
IGMP latency
DSL
Trunking Gateway
IP
Link failures, Route flapping, Delay..
PSTN
IP Set Top
Access link Congestion, Packet loss
IP phone computer
Echo Inside Wiring, RF interference
Analog phone
500
Congestion
400
Voice Data
300 200 100 0
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10 11 12 13 14 15 16 17 18
4 MOS
Bandwidth (kbit/s)
IP problems are transient
3 2 1
Time
Key factors in monitoring VoIP/IPTV QoE • Many problems are transient – Only way to detect is continuous monitoring – Reporting average loss/ jitter/ quality can mislead
• Problems often occur in the last mile/ customer premise – Only way to detect is to embed monitoring functionality into CPE – Need efficient push model for data collection • Information from the embedded agent to receiver
Triple Play - Monitoring Architecture Customer Premises
WiFi phone
Video Content
IP Set Top Trunking Gateway
DSL IP IP phone
PSTN computer
VoIP Monitoring Function IPTV Monitoring Function
Analog phone
RTCP XR based protocols
RTCP XR VoIP Metrics
High level QoE metrics (MOS) Detailed information on packet loss distribution
RTCP XR Video Metrics
Signal related metrics extracted from decoder
RTCP XR used as the basis for many other QoE/QoS reporting protocols
RTCP XR objectives
Small payload - 40-100 bytes
XR
QoE metric
QoE metric
Diagnostic data
Informative enough to support post-analysis for problem identification Small enough to capture for every call/ strean
RFC3611 - RTCP XR VoIP Metrics • Packet statistics – Loss rate, discard rate – Burst length/ density, Gap length/ density
• Delay metrics – Network round trip delay – End system internal delay
• Signal related – Signal level, noise level, echo level
• QoE scores – R factors and MOS scores
• Configuration – Jitter buffer configuration
RTCP XR VoIP Metrics Application
“B”
“A”
VoIP Endpoint
RTCP XR RTCP XR
Trunk side
Echo problem
Quality of stream from B to A and acoustic echo at A Quality of stream from A to B and Echo level on trunk side
RTCP XR Video Metrics • IP statistics – Packet loss rates before and after FEC
• Video transport metrics – RTP and MPEG-Transport metrics – Burst/Gap metrics – Jitter levels
• QoE metrics – Transport quality metrics – MOS scores for Audio, Video, Audio-Video – Control plan quality metric
• Video stream metrics – I, B, P frame counts – Playout gaps
• Configuration
Triple Play - Monitoring Architecture Customer Premises
Existing NMS/SMS platforms
WiFi phone
IP Set Top
SNMP (XR MIB)
DSL IP IP phone
Data collection Server
Push model protocols - RTCP XR, SIP……
computer
Analog phone
Summary • Optimum approach to VoIP/IPTV service quality management: – Embedded service quality monitoring “agents” in residential gateways, IP Set Top Box, VoIP devices – Use advanced QoE monitoring functionality that can detect transient IP problems and report impact on perceptual quality – Use lightweight push model protocols to collect and aggregate data from endpoints
• Good news!! – – – –
Technology exists to do this Protocols already defined in ITU, IETF,…. Already widely used for VoIP (4 million+ endpoints) IPTV technology is in test equipment and moving into the network
Thank you
www.telchemy.com
