IETF RFC 7458 PDF

With Wi‐Fi emerging as a crucial access network for mobile service providers, it has become important to provide functions commonly available in 3G and 4G networks in Wi‐Fi access networks as well. Such functions include Access Point Name (APN) Selection, multiple Packet Data Network (PDN) connections, and seamless mobility between Wi‐Fi and 3G/4G networks.

The EAP Authentication and Key Agreement (EAP‐AKA), and EAP‐AKA', protocol is required for mobile devices to access the mobile Evolved Packet Core (EPC) via Wi‐Fi networks. This document defines a few new EAP attributes to enable the above‐mentioned functions in such networks. The attributes are exchanged between a client (such as a Mobile Node (MN)) and its network counterpart (such as an Authentication, Authorization, and Accounting (AAA) server) in the service provider's infrastructure.