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Advanced: Control and User Plane Separation of EPC nodes (CUPS)

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This presentation looks at Control and User Plane Separation of EPC nodes (CUPS) which was completed by 3GPP as part of Release 14 specifications and is set to be a key core network feature for many operators.

CUPS provides the architecture enhancements for the separation of functionality in the Evolved Packet Core’s SGW, PGW and TDF. This enables flexible network deployment and operation, by distributed or centralized deployment and the independent scaling between control plane and user plane functions - while not affecting the functionality of the existing nodes subject to this split.

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Advanced: Control and User Plane Separation of EPC nodes (CUPS)

  1. 1. Control and User Plane Separation of EPC nodes (CUPS) @3g4gUK
  2. 2. The ‘4G’ LTE Network Architecture ©3G4G BSC BTS MSC Voice (PSTN) Network SGSN Data (IP) Network RNC Node BeNodeB MME GGSN Access Network Core Network Air Interface MSUEUE BSSRNS S-GW P-GW 2G 2.5G 3G 4G EPC = Evolved Packet Core MME = Mobility Management Entity S-GW = Serving Gateway P-GW = PDN Gateway PDN = Packet Data Network eNodeB = evolved NodeB EPC
  3. 3. EPC before CUPS ©3G4G Data (IP) Network eNodeB MME UE S-GW P-GW EPC S1-MMES1-U S11 SGi HSS S6a PCRFTDF SGi Gx S5/S8
  4. 4. Control & User Plane Protocol Stacks ©3G4G Control Plane Protocol Stacks User Plane Protocol Stacks Source: Netmanias
  5. 5. Example Message Flow for Bearer Establishment ©3G4G Source: Alcatel-Lucent Whitepaper
  6. 6. EPC before CUPS ©3G4G Data (IP) Network eNodeB MME UE S-GW P-GW EPC S1-MMES1-U S11 SGi HSS S6a PCRFTDF SGi Gx S5/S8
  7. 7. EPC after CUPS ©3G4G Data (IP) Network eNodeB MME UE S-GW-C P-GW-C EPC S1-MMES1-U S11 SGi HSS S6a PCRFTDF-U SGi Gx S5/S8-C P-GW-U S-GW-UTDF-C S5/S8-U Sxb Sxa Sxc
  8. 8. 3GPP CUPS Architecture ©3G4G Source: 3GPP
  9. 9. High Level Principles for CUPS Architecture ©3G4G • The CP function terminates the Control Plane protocols: GTP-C, Diameter (Gx, Gy, Gz). • A CP function can interface multiple UP functions, and a UP function can be shared by multiple CP functions. • An UE is served by a single SGW-CP but multiple SGW-UPs can be selected for different PDN connections. A user plane data packet may traverse multiple UP functions. • The CP function controls the processing of the packets in the UP function by provisioning a set of rules in Sx sessions • A legacy SGW, PGW and TDF can be replaced by a split node without effecting connected legacy nodes.
  10. 10. Advantages of CUPS Architecture ©3G4G • Reducing Latency on application service, e.g. by selecting User plane nodes which are closer to the RAN or more appropriate for the intended UE usage type without increasing the number of control plane nodes. • Supporting Increase of Data Traffic, by enabling to add user plane nodes without changing the number of SGW-C, PGW-C and TDF-C in the network. • Locating and Scaling the CP and UP resources of the EPC nodes independently. • Independent evolution of the CP and UP functions. • Enabling Software Defined Networking to deliver user plane data more efficiently.
  11. 11. CUPS evolution to 5G - Ericsson ©3G4G Source: ITU
  12. 12. CUPS evolution to 5G Architecture ©3G4G Source: Heavy Reading
  13. 13. Further Reading Materials ©3G4G • 3GPP: Control and User Plane Separation of EPC nodes (CUPS) - http://www.3gpp.org/cups • ITU: 5G Network Architecture and FMC - Joe Wilke, Ericsson - http://www.itu.int/ • Heavy Reading: Service-Based Architecture for 5G Core Networks - http://www.3g4g.co.uk
  14. 14. Thank You To learn more, visit: 3G4G Website – http://www.3g4g.co.uk/ 3G4G Blog – http://blog.3g4g.co.uk/ 3G4G Small Cells Blog – http://smallcells.3g4g.co.uk/ Operator Watch - http://operatorwatch.3g4g.co.uk/ Follow us on Twitter: https://twitter.com/3g4gUK Follow us on Facebook: https://www.facebook.com/3g4gUK/ Follow us on Linkedin: https://www.linkedin.com/company/3g4g Follow us on Slideshare: https://www.slideshare.net/3G4GLtd Follow us on Youtube: https://www.youtube.com/3G4G5G Follow us on Storify: https://storify.com/3g4gUK ©3G4G