Transcript QoS-enabled Information Transport: Yet Another Operator Service

Universität Stuttgart
Rechenzentrum
QoS-enabled Information
Transport: Yet Another
Operator Service
Antonio Cuevas ([email protected])
Netze und Kommunikationssystem
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RUS
15. Januar 2008
page 1
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Index…
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Introduction, state of the art and step
beyond.
 Benefits
 Impact in NGN architectures

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Implications of a universal IP network
Any
device
Any access technology
Any Application
Plus business aspects,
Service platforms
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Aspects to be revisited

This complex ecosystem makes that aspects
already settled need to be revisited: QoS,
managing the network service (i.e.
transporting bits end-to-end)
 Maxisat in Finland provides QoS for triple
play scenarios
 Deustche Telekom CEO statement
 Managing the information transport service in
a finer way and integrated into the overall
service delivery  IMS
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In IMS the CSCF-PCRF-PERF interaction assures that
the flows receive tailored QoS
CSCF (SIP Proxy)
SIP signaling
PCRF
CDF/
CGF
HSS
PERF as a
GGSN
Voice, Video
3G UMTS network
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Step forward

In IMS information transport service is subsidiary to
the applications, a parameter of the applications, 
bounded flexibility

PROPOSAL
Consider “information transport” as a service on its
own, with its AAA characteristics and compose it
with the other services using service composition
techniques

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Conceptual difference, but that brings many benefits
Netze und Kommunikationssystem
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RUS
15. Januar 2008
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Universität Stuttgart
Index…
Rechenzentrum
Introduction, state of the art and step
beyond.
 Benefits
 Impact in NGN architectures

Netze und Kommunikationssystem
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RUS
15. Januar 2008
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Universität Stuttgart
As a service, “information transport” can
be opened to many parties
Rechenzentrum
IMS’
CSCFs
Network
operator
Communication
endpoints
Service
providers
Entities setting up
the “information transport”
session parameters
Proxies
QoS-enabled
network
infrastructure
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More open to different business
models


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

Operator provides “information transport”
In semi-walled garden scenarios, it is aware of the
“application level” services
Operator sees: 1 + 0..n services, n=0 in the Internet
case
In IMS, “information transport” is a parameter of the
applications, not a service on its own, so n=0 not
supported
In our case, “information Tx” service has its own
AAA and can be composed with other services
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Service composition techniques
to deal with complex business
scenarios


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news streaming service with discounts from 9:00pm
to 7:00am
depending on a specific
data transport service with discounts from 8:00pm to
6:00am.
By considering data transport as any other service
and by employing existing service composition
techniques, this conflictive situation can easily be
handled at a service broker level (typically the
network operator).
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Many aspects affect QoE:
service composition
techniques to control them
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User control
and pricing
QoS in the
IP networks
forming
the Internet
and in the
routers
connecting
them
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Transcoders
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QoS of the
applications,
e.g.
negotiating
the optimal
codecs
Tailoring to the
Terminal (e.g.
screen size)
and context
(driving, working)
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Index…
Rechenzentrum
Introduction, state of the art and step
beyond.
 Benefits
 Impact in NGN architectures

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A. Cuevas
RUS
15. Januar 2008
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Notion of session for the
“information transport service”

A session is an instance of a service
 Flow control in many NGN QoS architectures
 RFC about setting up and tearing down
“network reservations” using RSVP
 We can think that a flow is a session of the
“information transport” service
– with QoS parameters or not

All flows need to be controlled, scalability
concerns
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Flow state is not kept end-to-end…
bundling these flows must be done
Bandwidth
Broker
DiffServ CN
No access control,
No session
No need of flow-user association
IntServ
like AN
IntServ like AN,
Access control,
Sessions
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QoS-enabeld
data transport
system
Bandwidth
Broker
COPS
Decision
outsourcing &
configuration
Transport session setup
RSVP
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Transport session setup
Router
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Router
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Service Logic entity
Operator’s AAA System
User & Packet correspondance
Divide and conquer
technique
Reserves network
ressources
tailored to
applications
QoS-enabled transport
System
Network and packets control
Deals with packets parameters
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Details about the AAA System
function

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Diameter NAS Application used to gain access to the
network
Using e.g. IPSec user-packets correspondance is
waranteed
IDEA
Divide “gain access to the network” and “information
transport service”
Operator’s AAA System specialised in the first,
network infraestructure in the second
Bundling must be provided
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Transport
System
Sessions: Network
Access (NA),
Transport (T) and
Application (A)
AAA
System
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AAA
System
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Transport
System
Bundling Sessions: NA
and T
Bundling Sessions: T
and A
T4
T3
NA1
NA2
T1
T2
A2
User A
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User B
A1
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Thanks for your attention
Questions?
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