Looking at the end-to-end processing, typical software-intensive systems are built as a system-of-systems where each sub-system specializes according to both the business and technology perspective. One challenge is the integration of all systems into a single system -- crossing technological and organizational boundaries as well as functional domains. To facilitate the successful integration, we apply the system design process Simulation Driven Development (SDD). The basic idea is the application of realistic simulation models in parallel to existing software engineering procedures to enable testing and validation from day one. In this article we discuss the coupling of sub-systems implemented as virtual simulation models with sub-systems implemented as real sub-systems to enable unit tests against system level. Two approaches are presented: loose coupling and tight coupling.
Opisano różne koncepcje architektur dla systemów integracji WLAN - GPRS/UMTS. Przedstawiono ogólny model integracji luźnej, aspekty związane z konstrukcją terminali oraz mechanizmy uwierzytelniania IP-SIM. Przedyskutowano możliwe scenariusze ewolucji systemów WLAN jako techniki komplementarnej dla przyszłych sieci 3G.
EN
This article describes various methods and architectures for WLAN - GPRS/UMTS integration. The loose coupling model, terminal aspects and IP-SIM authentication methods have been presented. Article discusses possible scenarios for WLAN systems as complementary radio access technology to the 3G systems.
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.