LTE network operates solely on the PS (Packet Switched) domain. Unlike previous generation networks, LTE does not have a CS (Circuit Switched) domain. UE must connect to at least one Packet Data Network (PDN) to facilitate data communication. In an EPS (Evolved Packet System), a PDN refers to an external data network, such as the internet or a corporate intranet. APNs (Access Point Names) are used as identifiers for PDNs.
The P-GW (PDN Gateway) resides at the boundary between the EPC (Evolved Packet Core) and the PDN. The EPS Bearer, which serves as a replacement for the PDP (Packet Data Protocol) context in UMTS networks, exists between the UE and the P-GW.
The EPS Bearer, as a tunnel, is essential for establishing and maintaining a reliable connection between UE and the PDN in LTE networks, ensuring seamless data communication and an enhanced user experience.
