NIPS 97

1
Broadband Network Architectures
Evolution towards Distributed Intelligence

• Network Information Processing Systems 97
• Juhana Räsänen, Vesa-Matti Puro, Petteri Koponen,
  Olli Martikainen
• Helsinki University of Technology
• Laboratory of Telecommunications Software and
  Multimedia

2
Motivation

• ATM and optical switching will increase the
  capacity of backbone networks
• xDSL and wireless access technologies will bring
  low-cost broadband access available to the
  residential users
• Result Bandwidth will become a commodity, which
  makes services the most critical component of the
  future broadband networks

3
Broadband scenario
?
Backbone network (WDM, optical packet switching)
STB
Broadband access network
Residential customer
4
Traditional ATM networks
Call Control
ATM signalling
Call Control
ATM signalling
ATM / AAL5
ATM / AAL5
ATM switch
ATM switch
5
Traditional ATM networks

• Traditional commercially available
• Connection setup using signalling protocols, eg.
  ITU-T Q.2931 SS7 BISUP or ATM Forum UNI 3.x
  / 4.0 PNNI
• The only service is the end-to-end ATM
  connectivity, either point-to-point or multicast
• How to introduce real services?

6
IN enabled ATM
IN Services
BINAP
Call Control / IN
SS7
ATM sig.
BINAP
SS7
Service Control Point
ATM / AAL5
Call Control
ATM signalling
Service Switching Point
ATM / AAL5
Service Switching Point
7
IN enabled ATM

• Adds the concept of services by letting external
  service logics control the connection setup
• Service logic invocation through triggers that
  react to certain events of the call setup process
• Call forwarding, freephone, televoting
• But Can all intelligent services for broadband
  networks be built on PSTN service model?

8
Distributed service logic
IN Services
Appl
Open Call Control
Transport
ATM sig.
Trans- port
SCP
ATM / AAL5
Call Control
ATM signalling
SSP
ATM / AAL5
SSP
9
Distributed service logic

• The interface to the Call Control is opened for
  external service logics and end user applications
• The Call Control interface is accessed eg. using
  CORBA or other distributed programming tools
• A transport protocol, eg. TCP/IP or SS7, is
  needed for carrying CORBA requests
• Is ATM signalling needed anymore?

10
Intelligence Evolution

• Traditional ATM needs a service concept
• Introduction of IN creates the service concept,
  but does not satisfy broadband networking needs
• Service logic distribution can be achieved by
  opening the Call Control interface
• Result ATM signalling (at least at the UNI) and
  traditional Call Model can be replaced

11
Service control over IP
Service
Appl
Agent
Service Execution Environment
TCP/IP
IP over ATM
Server
ATM / AAL5
Service Execution Environment
IP over ATM
ATM switch
ATM / AAL5
ATM switch
12
Service control over IP

• The Call Control is replaced with an object-based
  environment into which service logics can be
  deployed as executable objects
• Service objects are able to control the network
  through interfaces provided by the Service
  Execution Environment
• All control data can be transported over TCP/IP

13
Calypso architecture

• Based on the service control over IP idea
• Service-oriented a platform for easy service
  creation and deployment
• The service logic objects are executed in a
  run-time Java environment, which provides the
  interfaces needed for service setup
• TV distribution will be demonstrated Dec 1997

14
TV distribution service in Calypso
Channel Manager
Channel requests
Agent
Viewer
SEE
Launch
IP over ATM
Appl
TV Broadcast Server
STB / PC
Infrared Remote Control
15
Conclusion

• A new kind of service architecture is needed to
  support future needs of broadband networks
• ATM signalling and IN model can be at least
  partially replaced by distributed service model
• Calypso project develops an architecture in which
  the services are implemented with Java components
  that control an ATM switch directly