What is S1-MME?

The S1-MME is a reference point in the evolved packet system (EPS) architecture of 4G LTE networks. It is the interface between the eNodeB (the base station) and the Mobility Management Entity (MME). The MME is a key control-node in the LTE network, responsible for functions like user authentication, mobility management (tracking the location of the mobile device), and session management (establishing and maintaining connections for data transfer). The S1-MME interface carries signaling information related to these functions between the eNodeB and the MME, enabling the network to manage mobile devices and their connections efficiently.