The "brain" of the control plane. it handles signaling related to mobility and security for E-UTRAN access. It is responsible for tracking and paging UEs (User Equipment) in idle mode.
Engineers often use tools like Wireshark to analyze "hot" traces of these flows. Identifying messages like Create Session Request or Modify Bearer Request is key to mastering LTE signaling. The "brain" of the control plane
This flow occurs when a user moves from one eNodeB to another where there is no direct X2 interface between them. The "brain" of the control plane
The MME communicates with the HSS to authenticate the UE and establish security keys. The "brain" of the control plane