Inside the EPC, the HSS and MME communicate using a protocol based on Diameter. The basic Diameter protocol  is a standard IETF protocol for authentication, authorization and accounting, which was based on an older protocol known as Remote Authentication Dial In User Service (RADIUS) [41, 42]. The basic Diameter protocol can be enhanced for use in specific applications: the implementation of Diameter on the S6a interface  is one such application.
- Chapter 2: System Architecture Evolution
- from An Introduction to LTE: LTE, LTE-Advanced, SAE, VoLTE and 4G Mobile Communications, 2nd Edition
- Publisher: John Wiley & Sons
- Released: July 2014
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