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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   Scope   Word-p. 7
2   References
3   Definitions and abbreviations
4   Architectural considerations
5   Key issues   Word-p. 12
6   Solutions
6.1   Solutions to key issue 1
6.1.1   Solution 1: Functional split for SGW, PGW and TDF   Overview      Up   Functional split of SGW   Functional split of PGW   Word-p. 16   Functional split of TDF   Word-p. 18   Considerations for GTP-U IP address and TEID allocation   Word-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 SGW   Word-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 function   Word-p. 33   Considerations for performing LI functionality   Word-p. 34   Considerations for control of user plane forwarding   Word-p. 39   Procedures over Sx Reference Points   Word-p. 43   Parameters for Sx Reference Points      Up   Application of Sx session management procedures to existing procedures   Consideration for activation/deactivation of predefined PCC/ADC rules   Word-p. 57
6.1.2   Solution 2: Functional split for combined S/P-GW (key issue #1)

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