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TR 29.844 (CT4)
Study on Control and User Plane Separation of EPC Nodes

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V14.0.0 (Wzip)  2017/06  52 p.

Rapporteur:  Mr. Schmitt, Peter
See also:  CUPS-related TS/TR

The present document analyses the aspects with regard to the new interface between Control Plane and User Plane due to the separation of the following EPC nodes: S-GW, P-GW and TDF. Specifically, the following aspects are to be analysed:
  • Restoration procedure enhancements for the separated nodes;
  • Signalling with regards to Load control;
  • Signalling with regards to Overload control;
  • Path management and path failure handling.


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1  ScopeWord-p. 7
2  References
3  Definitions, symbols and abbreviations
4  Architecture and requirements
5  RestorationWord-p. 9
5.1  Introduction
5.2  Solutions for SGW-C failure with and without restart
5.3  Solutions for SGW-U failure with and without restart
5.4  Solutions for PGW-C failure with and without restart
5.5  Solutions for PGW-U failure with and without restart
5.6  Solutions for TDF-C failure with and without restartWord-p. 30
5.7  Solutions for TDF-U failure with and without restartWord-p. 32
5.8  Detection of a PFCP entity restart
5.9  Solutions for SGW-C partial failureWord-p. 36Up
5.10  Solutions for PGW-C partial failureWord-p. 38
5.11  Solutions for SGW-U partial failureWord-p. 40Up
5.12  Solutions for PGW-U partial failure
5.13  Evaluation and conclusionUp

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