The MME sends a Bearer Setup Request to the eNodeB. The eNodeB reconfigures the radio connection over the air with the UE ( RRC Connection Reconfiguration ).
The EPC is the all-IP core network for LTE, designed to be simpler and more efficient than its predecessor (the 2G/3G core). A key innovation is its , which removes legacy controllers like the RNC (Radio Network Controller) to reduce latency and improve user experience. It is responsible for orchestrating mobility between LTE cells and even between LTE and other technologies like Wi-Fi or 2G/3G, all while enforcing critical policies on Quality of Service (QoS) and charging.
This paper provides an overview of the 4G LTE Evolved Packet Core (EPC) The MME sends a Bearer Setup Request to the eNodeB
Designed with fewer nodes to reduce latency compared to 3G.
The P-GW assigns an IP address to the UE. A key innovation is its , which removes
The Evolved Packet Core (EPC) is a key component of the 4G LTE (Long-Term Evolution) network architecture. It provides a high-speed, all-IP network for delivering mobile broadband services. The EPC is responsible for managing user sessions, routing data packets, and providing connectivity to the internet and other IP networks.
: Manages the data path during handovers between different eNodeB towers. 4. Packet Data Network Gateway (P-GW) The P-GW assigns an IP address to the UE
: The primary control node. It handles Non-Access Stratum (NAS) signaling, manages user authentication via the HSS, tracks UE locations (Tracking Area lists), and manages session/bearer setup.
: The MME informs the HSS of its current location; the HSS returns the user's subscription profile.