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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

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.

full Table of Contents for  TR 23.857  Word version:   11.0.0


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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
6.5  EPC restoration procedure if the ISR is activatedWord-p. 30
6.6  Restoration of CS services after MME failure
6.7  Detection of EPC Node failure without RestartWord-p. 43
6.8  EPC Node Restoration for Partial Failure of EPC nodesWord-p. 44
6.8.0  Solutions for general enhancement to the Partial Failure when ISR is active
6.8.1  Alternative Solutions for MME Partial FailureUp
6.8.2  Alternative Solutions for SGW Partial failure
6.8.3  Alternative Solutions for PGW failureWord-p. 50
6.9  EPC Node Restoration for Partial Failure of EPC nodes when ISR is active
7  Conclusions and recommendationsWord-p. 53
A  Impacts to SpecificationsWord-p. 63
B  Change historyWord-p. 66

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