th november 2007 - ist agave project: lightweight ... · 6th november 2007 dave wisely ... • 1 q...

QoS in a converged World

Workshop on "Management of Network Virtualisation", Brussels6th November 2007

Dave WiselyHead of Convergence ResearchBT Group [email protected]

© British Telecommunications plc

110 acres5000 + people

one of the highest concentrations of technologists in Europe.

BT’s main research site - Adastral Park


Agenda

• What does convergence mean?• 21C - an all-IP convergence platform• Who benefits from QoS ?• Current solution • Elegant (IMS) solution – can we sell it?• Wireless issues – Media Independent Handover• Conclusions


GSM

HSDPA

3G

Home Small office

EnterpriseOut and about

Convergence?- anywhere, anytime, anyplace

Broadcast

Wimax

Broadband


BT Home Hub – Home and small office

Gaming

Wireless Network

PCs

Next Generation TV

Monitoring and Control

Remote diagnostics and support

Next Generation

Voice

Next Generation VoiceIn/out of home and office

Videophone

Home

1m Home hubs distributed Q2 07 + 300k (SME)


21C - A Platform for Mobility & Convergence

Away from Home or Office

At Home

Around the Office

At Hot Spot

Mobile NetworkGSM/GPRS & 3G

with Vodafone

Wireless AccessWiFi & WiMAX

ResidentialBroadband Access

DSL & Cable

Enterprise NetworksLAN & WiFi

PSTN

BT 21CNetwork

21CSIP/IMS

Infrastructurefor VoIP, Video,

Messaging & Broadband

Data Services ConvergedIM/SMS/MMS

Interfaces toVodafone

Network

LegacyInterfaces

to PSTN

ConvergedVoicemail

__


Who benefits from QoS?• Users –

– want services– don’t care how it is done if service “works”– Will churn and complain if service fails– Won’t pay more for QoS specifically

• Service providers– Want to sell services– Might pay more for QoS – Need to be persuaded it makes a difference!

• Network providers– Need to move away from connectivity– Want to sell network “value-add” – QoS, location, security..– Will only invest if there is a good business case


Current solution - practical

BRAS

DSLAM

More upstream voice than the limited US bandwidth can support. US voice and data competing for limited US bandwidth, voice get delayed

Service Switch

Internet

SBG1

SBG2

SBG3

DS voice and video delayed by in-home, transit traffic,……or slow HN technology

High bit-rate business services overload US backhaulInter-service interference

HG

DS aggregate insufficient for video(+voice)DS VC saturated

with data, voice gets dropped

3

1

4

5

2


• Services identified by static signatures in HG

• EU markings ignored• 1 Q per service class• Mix of SP + WRR Qs (e.g. 3+3)• All SP traffic gets sent• No service policing

Not scalable to mobile

Edge Node

DSLAM

Service Switch

Internet

Videp

Voice

HG

Video and voice traffic marked by service platforms

InterconnQoS

managed on aggregates

• BRAS assures video BW per line• BRAS prioritises voice over data

per line• CAC system limits video aggregate


DSL QoS – some observations!

• Bandwidth increases with a Moore’s law constant of <12months!

• QoS solutions are only of use for loadings of 70-200% of network capacity

• 3 QoS classes work as well as 6! • L2 “hard” solutions work well for Enterprises with

strict QoS requirements• “all you can eat” tariffs are not ideal!

5GByte

No.Users

50MByte


Resource and Admission Control Functionality

RACS

Based on3GPP IMS

IP ConnectivityAccess NetworkAnd related functionality

Network AttachmentFunctionality

NASS

Other Multimedia Components …

Streaming Services (RTSP based)

Applications

Core transport NetworkAccess Transport

Network

IP

UserProfiles

Other N

etworks

PSTN / ISDN Emulation(SIP-I based)

A-MGF

PSTN/ISD

N

AccessNode

Core BorderNode

RACS

IP Multimedia Component (Core IMS)

(SIP based)

IP EdgeNode

L2TF

RCEFARF

C-BGF

T-MGF

TGW

I-BGF

BGW

R-MGF

RGW

IBCF

Longer term solution - ETSI TISPAN NGN R1


Backhaul

Physical Realisation II:Use Case Scenario

SP COn-line Gaming

SP BVideo Streaming

Service

SP AEnterprise

VideoTelephony

Core Transport Nw

BRAS

SPDF

A-RACF

PEP

RACS

1. Setup videotelephony conference to team2. Request resources for audio and video flows specifying characteristics3. Make policy-based and resource availability-based admission decision and enforce

corresponding policies in the network4. RACS sends acknowledgement of successful reservation to Application5. Application acknowledges successful videotelephony session to user 6. Videotelephony session starts

ADSL Service Provider

12

3

45

6


BT IPStream Advanced Services Trial

• Policy Management on broadband

• Planned trial– STIN427 & STIN450*

• End User Speed Control• Down Stream QoS• Web Services Interface

BRAS

NP-ADQ

Service Provider

BT Wholesale

*Supplier Trial Information Notes Can be found http://www.sinet.bt.com

ADQ Interface Calls:• SetDefaultPolicy()• ApplyPolicy()• AlterPolicy()• ReleasePolicy()• GetLineStatus()• GetUsageHistory()


GSM RadioAccess Network

UMTS Terrestrial Radio Access Network (UTRAN)

GMSC

HSS(HLR/AuC)

RNC

RNC

BSS

MSC

VLR

SGSN

CS-MGWCS-MGW

P/S/I-CSCF MGCF

MediaGateway

Signalling Gateway

CS Domain

PS Domain

GGSN

PSTN/GSM

IMSInternet

Other PLMNsBGW

MRF

SecurityGateway

IMS DomainTE

Mobile Network – all-IP in 2015?


Convergence today is mostly about WiFi

– Wi-Fi handsets forecast to increase nearly 1300% through to 2010*– 245.9 million Wi-Fi portable devices globally by 2010**– 22 million in the UK alone by 2011 *– Wi-Fi Alliance has already certified over 3000 products– Over 142,407 free and paid Wi-Fi hotspots

in 132 countries – Over 300 wireless cities deployed

* Infonetics Research** Wireless Cities, BT Openzone, Wi-Fi Consumer & Business networks


Voice is still where QoS is most needed

BT Total BroadbandHome environment

BT FusionConsumer and Enterprise versions)

Skype on “3”


What is Media Independent Handoveraka 802.21

Wakeup WLANDownload over WLANShutdown GPS

CaféAirport

Wi-Fi

WiMAX

WLAN Link Going Down

Switch to WiMAXDownload over WiMAXShutdown WLANWakeup GPS

Wi-FiConnect to WLAN

Battery level lowShutdown WiMAXStop download

Wakeup WLAN

WiMAX

Shutdown GSMStart Download over WLAN

40 MbpsOFDMYes11EAP-PEAPPKMT-MobileNANA802.16d

N/A

Physical Layer

NA

NW

AT&T

Operator

9.6 kbpsN/A1900NAN/A13989GSM

Data RateQoSChannelSecurityBSSIDSSID/ Cell ID

Network Type

N/A

Physical Layer

NA

NW

AT&T

Operator



Network Type

11 MbpsOFDM.11e6EAP-PEAP.11iCafé00:00:…Café802.11b

N/A

Physical Layer

NA

NW

AT&T

Operator



Network Type

11 MbpsOFDM.11e6EAP-PEAP.11iAIrport00:00:…Airport802.11b

N/A

Physical Layer

NA

NW

AT&T

Operator



Network Type

Radio StateRadio StateGSM

WLAN

WiMAX

GPS


WLAN

WiMAX

GPS


WLAN

WiMAX

GPS


WLAN

WiMAX

GPS


WLAN

WiMAX

GPS


WLAN

WiMAX

GPS


WLAN

WiMAX

GPS


Context Service

LSB

CSCF

Transfer

Adaptive

ISDynamic

Data

ISStatic Data

HSS

2G./3G2G./3G WLANWLAN WiMAXWiMAX

BT Connection Manager is split between network

and terminal

Service Broker is a SIP Application

Server within the IMS domain

Information Server cover Dynamic and Static

parameters

21C Mobility Architecture Testbed

MIH

H

ando

ver

Sup

port


Conclusions• QoS is an essential part of delivering at least video

and voice services• Today’s solution is a hotchpotch

– DSL edge solutions– Over provision

• Wireless – circuits/special treatment for voice• In the long term ETSI TiSPAN provides a complete

architectural solution which harmonises with mobile IMS solution

• Research into dynamic network selection, handover and adaptation will reduce QoS requirements

• AGAVE/EMANICS work of great interest to BT– Trilogy project– ECN work

Thank you – any questions?

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th november 2007 - ist agave project: lightweight ... · 6th november 2007 dave wisely ... • 1 q...

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