page_title: System Architecture Evolution
section_title: SGW (Serving Gateway) protocols
hierarchical_section_title: System Architecture Evolution / EPC protocol stack / SGW (Serving Gateway) protocols
caption_attribution_description: English: This figure presents the main interfaces that P-GW shares with other EPC nodes
context_page_description: System Architecture Evolution is the core network architecture of 3GPP's LTE wireless communication standard.
  SAE is the evolution of the GPRS Core Network, with some differences:
  simplified architecture
  all-IP Network
  support for higher throughput and lower latency radio access networks
  support for, and mobility between, multiple heterogeneous access networks, including E-UTRA, 3GPP legacy systems, but also non-3GPP systems
context_section_description: The SGW consists of 
  S11 control plane stack to support S11 interface with MME
  S5/S8 control and data plane stacks to support S5/S8 interface with PGW
  S1 data plane stack to support S1 user plane interface with eNodeB
  S4 data plane stack to support S4 user plane interface between RNC of UMTS and SGW of eNodeB
  Sxa: since 3GPP Rel.14, the Sx interface and the associated PFCP protocol was added to the SGW, allowing for the Control User Plane Separation between SGW-C and SGW-U.
  SGW supports S11 interface with MME and S5/S8 interface with PGW. The integrated control plane stack for these interfaces consists of IP, UDP, eGTP-C.
  SGW supports the S1-U interface with eNodeB and S5/S8 data plane interface with PGW. The integrated data plane stack for these interfaces consists of IP, UDP, eGTP-U.
caption: Main interfaces that P-GW shares with other EPC nodes
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