22.1273GPPRelease 9Service requirement for the Open Services Access (OSA)Stage 1TS
The goal of standardisation in 3GPP with respect to services is to provide a framework within which services can be created based on standardised service capability features. 3GPP services will generally not rely on the traditional detailed service engineering (evident for supplementary services in second-generation systems), but instead provides services using generic toolkits.
OSA is one of these toolkits, standardised within 3GPP, for the support of services within 3GPP system (see chapter 5.1).
Services can be implemented by applications using service capability features, which are accessible via the OSA interface towards these SCFs in the network.
Figure 1: Applications access Service Capability Features
via the standardised OSA Application Interface
5.1 Physical location of applications using the OSA interface
The physical location of applications accessing the OSA application programming interface is an implementation matter. This TS places no requirements on the physical location of the applications accessing the OSA application programming interface.
The only requirement on such applications accessing the OSA application programming interface is that they shall only do so via the framework for services.
The architectural support of the OSA application programming interface shall permit applications access to the OSA API independent of where the applications are physically executing.