Enhanced Packet System (EPS): The EPS is a core component of 4G LTE (Long-Term Evolution) networks, providing high-speed data communication. It consists of the Evolved Universal Terrestrial Radio Access Network (E-UTRAN) and the Evolved Packet Core (EPC).
EPSFB (Evolved Packet System Fallback):
In 4G LTE networks, when a user device moves out of LTE coverage, it may need to fall back to 3G or 2G networks for voice services because LTE is primarily a data network. This process is known as fallback. In a 5G context, the term EPSFB may refer to a similar concept where 5G-capable devices fall back to LTE or earlier networks for voice services.
