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TR 23.714 (SA2)
Study on
Control and User Plane Separation of EPC nodes

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V14.0.0 (Wzip)  2016/06  87 p.

Rapporteur:  Mr. Schramm, Mirko
See also:  CUPS-related TS/TR

The objective of this Technical Report is to study and perform an evaluation of potential architecture enhancements for the separation of user plane functionality from control plane functionality in the EPC's S-GW, P-GW and TDF to further enable flexible (i.e. distributed or centralized) network deployment and operation.

Specifically, the following aspects are covered:
  • Functional separation of the S-GW, P-GW and TDF into control plane and user plane functions, while not affecting the overall functionality provided by these nodes.
  • The needed reference points between the separated control plane and user plane functions of the S-GW, P-GW and TDF and the corresponding procedures.
  • Impacts to other EPC entities and interfaces that are essential to support the separation of S-GW, P-GW and TDF into control plane and user plane functions, and to enable the flexible placement of the separated control plane and user plane functions for supporting diverse deployment scenarios.


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1  ScopeWord-p. 7
2  References
3  Definitions and abbreviations
4  Architectural considerations
5  Key issuesWord-p. 12
6  Solutions
6.1  Solutions to key issue 1
6.1.1  Solution 1: Functional split for SGW, PGW and TDF  OverviewUp  Functional split of SGW  Functional split of PGWWord-p. 16  Functional split of TDFWord-p. 18  Considerations for GTP-U IP address and TEID allocationWord-p. 20  Considerations for online charging, offline charging and usage monitoring  Consideration for SGW Service Area and TAI list alignment due to control plane and user plane split of SGWWord-p. 23  Considerations for UE IP address management  Considerations for the functionality supported by the user plane function  Considerations for supporting extended buffering for the UE in power saving mode  Considerations for 3GPP specific information at the user plane functionWord-p. 33  Considerations for performing LI functionalityWord-p. 34  Considerations for control of user plane forwardingWord-p. 39  Procedures over Sx Reference PointsWord-p. 43  Parameters for Sx Reference PointsUp  Application of Sx session management procedures to existing procedures  Consideration for activation/deactivation of predefined PCC/ADC rulesWord-p. 57
6.1.2  Solution 2: Functional split for combined S/P-GW (key issue #1)

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