Cisco Serving Gateway (SGW) is a critical network function for the 4G mobile core network, known as the evolved packet core (EPC). SGW (Serving Gateway):The main function of the Serving Gateway is routing and forwarding of user data packets. Contents · 1 MME (Mobility Management Entity) 1. The SGW entity is the anchor point for intra-system handover (mobility within EPS network) provided that the mobile does not change group. Tech-blog covering LTE/4G topics, how MME PGW SGW are cooperating with other telco network elements. IPLOOK XGW include SGW and PGW.