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Inside the EPC, the HSS and MME communicate using a protocol based on Diameter. The basic Diameter protocol [40] 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 [43] is one such application.