S6a
**S6a**
What is S6a?
S6a is a reference point in 4G LTE and 5G networks. It is an interface between the Mobility Management Entity (MME) or Session Management Function (SMF) and the Home Subscriber Server (HSS) or Unified Data Management (UDM). The S6a interface is used for authentication, authorization, and mobility management. It allows the MME/SMF to retrieve subscription information and authentication vectors from the HSS/UDM for a user trying to access the network. This information is crucial for verifying the user's identity and enforcing their service profile.
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