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Core Network Architecture

  • 4G CN functions
  • MME: Mobility Management Entity – for intra 4G mobility and radio bearer activation / deactivation
  • S-GW: Serving Gateway – for routing and forwarding ofuser data packets, mobility with 2G/3G
  • P-GW: Packet Data Network Gateway – for connection with external packet data networks
  • PCRF: Policy and Charging Rules Function – supports detection and charging of data flows
  • HSS: Home Subscriber Server – for subscriber info


  • 5G CN functions
  • AMF: Access and Mobility Management Function – ensures part of 4G MME functions
  • UPF: User Plane Function – combines user plane functions of 4G SGW-U and PGW-U
  • PCF: Policy Control Function – equivalent to PCRF in 4G
  • SMF: Session Management Function – combines some of MME, SGW-C and PGW-C control functions.
  • UDM: Unified Data Management – equivalent to 4G HSS

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