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Content for  TR 29.811  Word version:  13.0.0

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2  Referencesp. 5

3  Definitions, symbols and abbreviationsp. 6

4  EPC race conditions scenarios and scenarios with hanging session/bearer contextsp. 6

5  Possible solutions for effective handling of EPC race conditions scenarios and scenarios with hanging session/bearer contextsp. 14

5.1  Introductionp. 14

5.2  Solutions for scenario 1 - Create Session Request at SGW colliding with an existing PDN connection contextp. 14

5.3  Solutions for scenario 2 - Hanging IP-CAN session context in PCRFp. 17

5.4  Solutions for scenario 3 - Overlapping transactions in the networkp. 17

5.4.1  Solution 1 - Guard timer at PGW to control the maximum time to respond to a Create Session Requestp. 17

5.4.2  Solution 2 - Longer T3 timer for the last GTP-C repetitionp. 18

5.4.3  Solution 3 - PCRF accepting the new IP-CAN session and tearing down the Gx session towards the previous PGWp. 19

5.4.4  Solution 4 - Including a Timestamp in the session requestp. 19

5.4.5  Solution 5 - Including a Timestamp and Maximum Wait Time in the session requestp. 23

5.4.6  Solution 6 - Introducing "Resend Indicator" in Create Session Requestp. 27

5.5  Solutions for scenario 4 - Hanging session context in 3GPP AAA Serverp. 28

6  Conclusions and recommendationsp. 29

$  Change Historyp. 33


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