2. IMS architecture
The IMS architecture is based on certain principles set out in the 3GPP technical specifications from the very first release (Rel-5 finalized in March 2003). This architecture is evolving and being enriched with new functionalities (Rel-6 finalized in March 2005 and Rel-7 in June 2007).
2.1 Architectural principles
The following architecture principles have guided the design of the IMS architecture since its first release 5.
Separation between network functions and radio access functions: the aim is to enable network access via different types of access, even if radio access technology evolves.
Independence from access technology: IMS architecture is designed from the outset to...
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IMS architecture
Network procedures in IMS (in Rel-5/Rel-6)
