4G LTE Essentials

Explore the end-to-end LTE/EPC architecture — from the radio access network (E-UTRAN) through every core network function.

Dive into OFDMA, resource blocks, LTE channels, and bandwidth options — the foundation of LTE radio communication.

Master the essential LTE signaling procedures — attach, bearer setup, handover, detach, and TAU — through animated call flows.

Learn how voice works over LTE — IMS architecture, VoLTE call flows, dedicated bearers, and SRVCC fallback.

Bridge LTE and 5G — map every EPC component to its 5G equivalent and understand the key architectural shifts.