QoS for broadcasting

Catania, Giovedi 3 Febbraio 2005
QoS for broadcasting
The Fastweb experience
QoSIP 2005
Andrea LASAGNA
andrea.lasagna@fastweb.it
FastWeb: The Competitive Advantage
g
Fibre-based Network infrastructure
g
g
g
Broadband-To-The-Home
g
g
Future-proof technology
Scalable Backbone
A single high-speed connection for integrated voice, Internet and video services
Integration of multimedia services over IP
g
Second generation Internet applications: not only text and images, but also high
quality interactive video, telephony and data
PG. 2
Fastweb’s Milestones
Fastweb’s
Foundation
Oct 1999
First
Business
Customers
Jan 2000
Multicast
Services
Launch
Internet
PPU
Launch
Oct 2001
Jan 2002
Consumer
Services
Launch
Oct 2000
VoIP
Class5
Service
Launch
Jun 2002
VoD
Services
Launch
Jan 2001
Videocom
Service
Launch
Nov 2002
Countrywide
Service
Expansion
May 2001
VoD over
ADSL
Launch
Mar 2003
xDSL
Service
Launch
Jul 2001
Multicast
over
ADSL
Launch
Aug 2003
PG. 3
FTTx vs xDSL: FastWeb service
support strategy
g
Full parity in services offered on both access technologies, to both
Business and Residential Customers
FTTx
xDSL
g
g
Voice
Video
Comm
Broadcast
TV
9
9
9
9
9
9
Video on
Demand/VCR
9
9
Internet/
VPN
9
9
Actual attainable performance levels are largely Layer 1-dependent
Same Customer experience, different technology-dependent
implementations
PG. 4
FastWeb’s Innovative Services:
FastWeb’s TV
Over
OverFiber
Fiberand
andADSL
ADSLnetworks,
networks,Fastweb
Fastwebtelevision
televisionoffers
offersnot
notonly
onlyVOD,
VOD,
but
butaawide
wideselection
selectionof
ofchannels
channelsand
andinteractive
interactiveservices
servicestoo:
too:
~~90
90channels
channels
-- Free
Freeto
toAir
Air
-- Free-to-sat
Free-to-sat
-- Satellite
Satellitepay-TV
pay-TV
channels
channels(Cinema,
(Cinema,
Sport,
Soccer)
Sport, Soccer)
PVR
PVR
-- Recording
Recordingfreefreeto-air
to-airchannels
channels
-- Access
Accessthrough
through
TV
or
internet
TV or internet
EPG
EPG
- - Program
Program
information
information
-- 24h
24hschedule
schedule
VOD
VOD
4.500
4.500on
onDemand
Demandtitles:
titles:
-- ONtv
ONtv
-- Rai
RaiClick
Click
Interactive
Interactiveservices
services
-- Internet
navigation
Internet navigation&&email
email
-- Games
and
T-shopping
Games and T-shopping
-- In
InPicture
Picture
channel
channelview
view
PG. 5
Video over IP services
g
Based onto multiple video distribution policies
g
g
g
g
Video on Demand Services (Unicast)
Broadcast Video Services (Multicast)
VoD and Broadcast Video Services based onto MPEG2 over IP
streams
Each stream requires up to 4 Mbps
PG. 6
Video over IP services
g
Service elements
g
Video Servers
g
g
Video Pumps
g
g
Registration and validation of Customer accesses and service requests
Providing video streams towards client stations
Video Station
g
g
Client device with extended service access and stream management
capabilities
Video station periodically send back Frame Rate and Packet Loss Reports
to provide a continuous quality feedback about the service in progress.
PG. 7
Video services & access technologies
g
g
g
g
g
g
g
FTTH
Fully scalable access architecture
Quality of services provided by the capacity of optical network
Practically unlimited bouquet of services (creativity-limited only)
dependent only on level of investment (network implementation
investment/service revenues ratio)
ADSL
Limits arise principally from the access network
Time-dependent behaviour of copper pair
Penetration of services is less than the number of customers potentially
available because of the limitations of bandwidth of the access network
The ATM overhead payload decrease the bandwidth available for IP
services
PG. 8
QoS implementation
g
FTTH: DiffServ-based QoS management
g
Natively implemented through edge traffic
marking and PHB QoS enforcement
TV
STB
Phones
MiniPoP
Mgnt
Building switch
TV CAM
PC
HAG
Multi-field
classification
User LAN
IP based match
VID=X, CoS=5
VID=0, CoS=5, ToS=5 set by HAG
IP based match
VID=X, CoS=4
VID=0, CoS=4, ToS=4 set by STB
IP based match
VID=X, CoS=1
VID=0, CoS=1 ToS=1 set by TV CAM
Default, no
match
VID=X, CoS=0
Untagged frames by default
PG. 9
QoS implementation
g
ADSL: ATM-based QoS management
g
Per-VC QoS management, requiring a coordinated effort across CPE, DSLAM,
ATM Switch and BRAS
ATM SWITCH
DSLAM
BRAS
HAG
Voice vc
Data vc
Mcast ch X
Unicast vc
Voice vc
Voice CBR vc
Data vc
Data UBR vc
Mcast ch X
Multicast Video vc
Unicast vc
Unicast Video vc
STM-4
Zapping vc
TV
STB
Phones
PC
STM-4
User LAN
PG. 10
QoS and Video Services
g
The determination of the service level should be based on end-to-end
measurements, which should provide information on:
g
g
g
g
The quality offered to the user.
The influence of the IP network on the video signal
In relation to video services, the performance of an IP network can be
classified based on the value of PLR offered to the end user.
Latency and jitter values may vary according to the de-jitter buffer and
of the playout delay employed at the CPE (STB) side.
PG. 11
QoS measuring
Parameter
Equipment
Motivation
Monitoring method
Packet loss ratio (PLR)
CPE (STB)
Image quality, video
information loss
estimation
In service or through test streams with
RTP/RTCP or sequence numbers
available on packet header.
Periodic PLR summary:
Reports with one-minute resolution.
Measurement of PLR requires
analysis of a number of packets at
least 10 times grater than the number
related to the target PLR value.
This determines the rate at which the
PLR is reported.
Network latency
Test probe at user side,
within CPE (STB) or as
closest as possible to user
access link.
Smooth playout
Test stream
Jitter
CPE (STB)
Smooth playout
In service or through test streams
with RTP/RTCP or timestamps
available on packet header.
Video Frame Rate
CPE (STB)
Image Quality
In service through codec specific
methods. Sampling
Video Buffer
Underflows/Overflows
CPE (STB)
Image Quality,
smooth playout
In service while playing video.
PG. 12