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TR 29.811 (CT4)
Study on EPC Signalling Improvements for Race Scenarios

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(W-zip) V13.0.0    2015/12    33 p.


Rapporteur:  Mr. Schmitt, Peter
See also:  –


The present document analyses various EPC race conditions scenarios and scenarios with hanging session or bearer contexts in EPC nodes, and assesses whether to improve the existing protocols and/or specifications for effective handling of these scenarios. The specification updates, if needed, may consist in EPC (GTP-C, PMIP and/or Diameter) signalling improvements, recommendations on how to minimize the occurrences of the issues, and/or clarifications on how the EPC nodes should behave in these scenarios.


 

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1 Scope    2 References    3 Definitions, symbols and abbreviations    3.1 Definitions    3.2 Abbreviations    4 EPC race conditions scenarios and scenarios with hanging session/bearer contexts    4.1 Introduction    4.2 Scenario 1 - Create Session Request at SGW colliding with an existing PDN connection context    4.3 Scenario 2 - Hanging IP-CAN session context in PCRF    4.4 Scenario 3 - Overlapping transactions in the network    4.5 Scenario 4 - Hanging session context in 3GPP AAA Server    5 Possible solutions for effective handling of EPC race conditions scenarios and scenarios with hanging session/bearer contexts    5.1 Introduction    5.2 Solutions for scenario 1 - Create Session Request at SGW colliding with an existing PDN connection context    5.3 Solutions for scenario 2 - Hanging IP-CAN session context in PCRF    5.4 Solutions for scenario 3 - Overlapping transactions in the network    5.5 Solutions for scenario 4 - Hanging session context in 3GPP AAA Server    6 Conclusions and recommendations    6.1 Introduction    6.2 Conclusion for scenario 1 - Create Session Request at SGW colliding with an existing PDN connection context    6.3 Conclusion for scenario 2 - Hanging IP-CAN session context in PCRF    6.4 Conclusion for scenario 3 - Overlapping transactions in the network    6.5 Conclusion for scenario 4 - Hanging session context in 3GPP AAA Server    A Change history   

 

1   Scope   Word-p. 5
2   References
3   Definitions, symbols and abbreviations   Word-p. 6
4   EPC race conditions scenarios and scenarios with hanging session/bearer contexts
5   Possible solutions for effective handling of EPC race conditions scenarios and scenarios with hanging session/bearer contexts   Word-p. 14
5.1   Introduction
5.2   Solutions for scenario 1 - Create Session Request at SGW colliding with an existing PDN connection context
5.3   Solutions for scenario 2 - Hanging IP-CAN session context in PCRF   Word-p. 17
5.4   Solutions for scenario 3 - Overlapping transactions in the network
5.5   Solutions for scenario 4 - Hanging session context in 3GPP AAA Server
6   Conclusions and recommendations
A   Change history   Word-p. 33

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