1. Calypso Service Architecture
Winter School, February 25th 1998
Petteri Koponen, Calypso Project

2. Introduction
Calypso is a 3-year research project at Telecommunications Software and Multimedia lab of HUT
Professor Olli Martikainen, Project Manager Juhana Räsänen
Calypso focuses on designing and piloting a flexible service architecture for broadband networks
Service prototyping at the same time

3. Agenda Domain Model Business Model Service Model Implementation Model
Java-Based Service Platform
Future Work

4. Domain Model Switch Controller Backbone Network Residential User
Access Network
Switch
Controller
Backbone Network
Servers
Residential User
Access Switch

5. right to use network resources
Business Model
Residential Users
Operators own and manage networks
Service providers create, deploy and manage services
Service providers pay operators for the right to use network resources such as bandwidth
Residential users pay service providers for the right to use their services
right to use services $
Service Providers
right to use network resources $
Network Operators

6. Service Model
Service logic can be distributed between clients, servers and network nodes
Access to both services and network resources is based on certificates
Services can be dynamically injected into the switch controller
user interface
access control, gateway services, [routing]
content, databases, service management, [routing]

7. Implementation Model Service components are Java programs
Browser
Service components are Java programs
Users execute them eg in Java-enabled browsers
Switch controller includes a platform for the execution of service components
Control is TCP/IP-based
Enables the use of off-the-shelf technologies such as Java, CORBA, HTTP, ... S2 S1
CORBA
HTTP
RMI S S1 S2
Switch Controller

8. Example: Internet Service
Internet connection established
Internet Service
Switch Service
Internet Applet
Virtual Channel carrying IP
Internet
Router

9. Java-Based Service Platform (1/2)
Every switch controller contains a service platform
Enables dynamic injection and execution of services
Services are (ordinary) Java programs
Implementing services is quick and easy
Uses Java’s dynamic code loading capability
Service execution calls for an enhanced Java security model (“service sandbox”)

10. Java-Based Service Platform (2/2)
Calypso Core Services
Calypso Services
Calypso Service Platform
Java API
Java Virtual Machine
Calypso Native Libraries

11. Responsibilities Service injection Managed by service providers
Services
Platform
Managed by service providers
Core services: Switch service, HTTP server, connection service
Other services eg channel service and Internet service
Service injection
Sandbox for service execution
Based on overlapping class namespaces and so called capabilities
Certificate based access control
Platform-independent service scheduling

12. Advantages Service creation is Java programming
Object-oriented methods, tools and libraries
Reuse of service components
Architecture enables very flexible billing and monitoring policies
Certificate-based access control provides interesting possibilities
Processing load can be distributed efficiently

13. Future Work Implementation of the service platform
Implementation of connection service and HTTP service
Piloting service management ideas
A lot of work with the security model
Cooperation with Pekka Nikander’s project