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TR 23.857 (CT4)
Study of
Evolved Packet Core (EPC) nodes restoration

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V11.0.0 (Wzip)  2012/12  66 p.

Rapporteur:  Mr. Lu, Fei
See also:  –

This TR contains the study on EPC nodes failure and restoration.

This document will consider any necessary operational protocol recovery mechanisms in the EPS in order to restore the subscriber service in the event of EPC node failure or clean up the hanging resource in other EPC nodes if the recovery of the failed node is not possible. The document will address the following aspects:
  • list the different network failure scenarios to be analyzed for EPC nodes: MME, S4-SGSN, SGW and PGW;
  • identify precisely the problems resulting from the current definition of the standards;
  • list various possible solutions;
  • identify pros and cons of possible solutions;
  • conclude on potential enhancements to the standards (depending on gains vs complexity).


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1  ScopeWord-p. 8
2  References
3  Definitions, symbols and abbreviationsWord-p. 9
4  Requirements analysis and assumptions
5  Failure scenarios
6  Alternative solutions
6.1  Alternative Solutions for MME failure
6.2  Alternative Solutions for SGSN failure
6.3  Alternative Solutions for SGW failure
6.4  Alternative Solutions for PGW failureWord-p. 29

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