EPS Bearer: The Core Data Transmission Tunnel in LTE Networks
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 dedicated data tunnel, is essential for establishing and maintaining a reliable connection between UE and the PDN in LTE networks. It underpins the entire data transmission process of the LTE PS domain, ensuring seamless, stable data communication and an enhanced user experience for various data services.
