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

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for a better overview, the Table of Contents (ToC) is reproduced
V14.0.0 (Wzip)  2016/06  87 p.

Rapporteur:  Mr. Schramm, Mirko

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.

full Table of Contents for  TR 23.714  Word version:   14.0.0

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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)
6.2  Solutions to key issue 2: Selection mechanism for user plane functional entitiesWord-p. 59
6.3  Solutions to key issue 3: Change of user plane session identity (due to other than UE mobility scenarios)
6.4  Solutions to key issue 4 - Relocation of user plane functional entity due to UE mobility
7  Overall evaluationUp
8  Conclusions
A  Example for interaction between CP and UP functionWord-p. 78
B  Example for attributes exchanged between the CP and UP functionWord-p. 81
C  Change historyWord-p. 87

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