“Proposal for the Validation of the Video Quality of IPTV Service”
Eng. Luis Enrique Conde del Oso.
luis.conde@etecsa.cu
Telephone: 537 2666825 Mobile 53 52884472
• Background.
• Obsolescence of TDM Technology.
Current scenario
of Telecom
Carriers
• Requirements for new services and increase of the current services.
- Fixed telephone service growth.
- Mobile service growth
- Wide development of data services.
- Introduction of novel services such as IPTV.
Proposal of Development
• Development of Services on NGN networks with NAM (GIE).
• Optimization of National Transport Network IP/MPLS.
• Designs and implementation of Local and Regional Metro
Networks.
• Introduction of the objective quality validation of services in real
time (and its extension to quality profile of telecommunications
network).
Beginning of the scheduled development
• Different levels of a NGN Network.
IP/MPLS
AR
BRAS
PE
AR
BRAS
VoD
PE
VoD
Service PoP
Service PoP
METRO
REGIONAL
VoD
ADM
E1
METRO
PROVINCIAL
ADM
Eth/SDH
STMn
FE
ADM
GE
Source: VPDT. ETECSA.
• Technical Requirements for Packet Transport Network
Level of PTN Equipment:
Characteristics:
Interfaces:
• Technical Requirements for Packet Transport Network
Transport:
• Technical Requirements for Packet Transport Network
Quality of Service
Characteristics Carrier Class
Synchronization
• Technical Requirements for Packet Transport Network
Standards for NGN Equipment
Minimal necessary interfaces
• IPTV Service proposed at the different levels of a NGN Network.
IP/MPLS
AR
BRAS
PE
AR
BRAS
VoD
PE
VoD
Platform of IPTV
Service PoP
Service PoP
METRO
REGIONAL
VoD
ADM
E1
METRO
PROVINCIAL
ADM
Eth/SDH
STMn
FE
ADM
GE
Source: VPDT. ETECSA.
• QoE and QoS. Human Vision Constraints
Perceived Quality (QoE)
STB influence
SLA
Source: VPDT. ETECSA.
SLA
Network Quality (QoS)
SLA
Quality
dependence of
the Service
• Proposal of validation points of IPTV quality service.
Punto 2
Validación
Serv
POP 1
Pseudo ring
Ethernet
Serv
POP 2
Pseudo ring
Ethernet
DWDM
Serv
POP 4
Serv
POP 3
IPTV
Head End
(No Encrypted signal)
(Encrypted Signal)
Pseudo anillo
Ethernet
Punto 1
Validación
Punto 3
Validación
(Encrypted Signal)
Source: VPDT. ETECSA.
•State of the art of validation Metrics for video quality.
Métricas
Subjetivas
BT.500.11 (Imágenes de TV).
P.910 (Aplic. de Multimedia), Calidad de video.
P.911 (Aplic. de Multimedia), Calidad Audiovisual.
Correlación
Métricas
(VQM)
Métricas
Objetivas
Métricas
Datos
Ref. Completa.
Ref. Reducida.
Sin Referencia.
Métricas
de Imágenes
Análisis de Videos
Decodificados.
Análisis de la Información
visual contenida.
• MSE
• PSNR
(Evaluación de Paquetes)
• VHS Metric.
(Aspectos de la visión Humana)
Comparación Implícita (DSCQS).
Comparación Explícita (DSIS)
Valoraciones Absolutas (SSCQE)
Valoraciones con Categoría Absoluta (ACR).
Métricas
Flujos de Video
•T- Factor (Profunda Inspección del flujo del Video (TS y
UDP)
Depende del Codec y muestra el impacto de los
disturbios de la Red en las pérdidas y su propagación
(espacial y temporal).
• MDI (Ligera Inspección del flujo del Video (TS y UDP)
Independiente del Codec
Red IP.
• Windows (GUI) of FreeProbe (Metric T-Factor) and FreeProbe (Metric MDI).
FreeProbe with T- Factor Metric
FreeProbe with MDI Metric
Fuente Telecom Italia - VPDT. ETECSA.
•Pilot Test using FreeProbe (T-Factor), a simulation of Orange solution.
Source: VPDT. ETECSA.
• IPTV Service Test Model applied at ETECSA laboratories.
Source: VPDT. ETECSA.
• Test Results of FreeProbe (Metric MDI). ETECSA’s Intranet vs BPL.
ETECSA’s
Domestic
Intranet
VLAN
QoS
Best effort
VLAN 10
VLAN 20
VLAN 30
Source: VPDT. ETECSA.
• Tests using NetDisturb in the testing model and classification of the
subjective quality experienced by the end user
Video Server
NetDisturb
Fuente VPDT. ETECSA.
Source: Telecom Italia – VPDT ETECSA.
• Test results done in the testing model (Channel SD to 4 Mbps)
Source: Telecom Italia - VPDT. ETECSA.
• Original video VS Original video with 1% Packet Loss Rate.
• Original Video.
•Video with 1% Packet Loss Rate.
•Centralization of QoE Validation with FreeProbe to substitute solutions
with Shadow Router. (Cisco, Tektronix, JDSU)
FreeProbe Server
SNMP
SNMP
FreeProbe
SNMP
Metric MDI
Pseudo ring
Ethernet
Serv
POP 1
DWDM
Pseudo ring
Ethernet
Serv
POP 4
Serv
POP 3
CUB
IPTV
Pseudo ring
Ethernet
Metric MDI
Head End
Measurement point
Data collect
Serv
POP 2
FreeProbe
FreeProbe
Metric T-Factor
Source: Telecom Italia - VPDT. ETECSA.
Quality Profile on networks, according to the following ITU-T Recommendations G.1050, TIA-921 and
ITU-T Y.1541
Source: UIT-T.
DSL Forum's WT-126
•SD. 1 paq./perd cada
30 minutos.
(MLR=0.004 paq/seg)
•HD 1paq./perd. cada
4 horas
(MLR=0.0005 paq/seg)
Fuente Spirent.
Source: DSL Forum's WT-126
• Conclusions
The introduction of Ethernet Metro networks in ETECSA constitutes the main core for
the development of ETECSA’s target network guarantying the growing requested by
the MIC in the triennium, as well as the incorporation of new services like IPTV.
The experiences on IPTV services validation in Telecom Italia using Free Probe has
been the starting point of valuable research experiences carried out in ETECSA
together with the development and programming of an IPTV service platform used in
this telecom company. It was done as from the study of the VideoLAN software code
source which reduced the cost of research stage.
The proposal of using Free Probe to validate the quality profile of ETECSA’s IP
network makes it an important alternative for the expensive purchase of Shadow
Router dedicated to this unique function that can be extended to other services in real
time like VoIP with an adaptation of the MDI metric.
The fulfillment of the recommendations made at the DSL Forum WT-126 is the base
of IPTV quality service in SD and HD formats, for which networks must meet the
quality profile according to UIT-T Y 1541.
The application of probes with T-Factor metric can be enlarged to quality validation of
TDT and 3G mobile systems.