System Architecture Evolution (SAE) is the name of the Third Generation Partnership Project ( GPP) standardization work item which is responsible for the evolution of the packet core network, more commonly referred to as EPC. This work item is closely related to the LTE work item, covering the evolution of the radio network. Evolved Packet System (EPS) covers the radio access, the core
network and the terminals that comprise the overall mobile system. Also provides support for other high-speed RANs that are not based on GPP standards, for example, WLAN, WiMAX or fixed access. The broad aims of the SAE work item were to evolve the packet core networks defined by GPP in order to create a simplified all-IP architecture, providing support for multiple radio accesses, including mobility between the different radio standards.