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5 Conclusions and Future Work
The rapid proliferation of telecommunications revealed the solid trend towards
serious technological divergence. Convergence is highly desirable instead to
introduce a global communication environment. Revolutionary approaches propose
complete redesign of existing systems. As a compromise, evolutionary approach
implies complex integration to be solved on all of the layers of network architecture.
The service portability is the core concept of the service-based integration. Portable
services can be reused across communication environments. To develop portable
services, avoidance of specific service design is a must. Separation of service creation
and service delivery allows for unique but generic service instance in interconnected
environment. Such service design also facilitates service integration.
Essential place in the service portability framework occupy adaptable applications.
As the service implementations they perform actual service porting across the
environments. Passing this function to the application complements to the generic
service design. Applications customize services to various environmental contexts.
They are launched on demand and can adapt at run-time, without service interruption.
Future work will focus on practical issues of design of service reference model
with appropriate horizontal layering and service characterization on top of the model.
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