Tech-invite 3GPPspace IETFspace

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Content for TR 23.890 Word version: 12.0.0

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4 Key Issues p. 5

4.1 Key Issue 1: ANDSF WLAN preferences with respect to specific 3GPP RATs p. 5

4.2 Key Issue 2: Undesired bearer handling p. 6

4.2.1 Scenario 1: Loss of bearers during inter-RAT 3GPP PS handover p. 6

4.2.2 Scenario 2: Undesirable inter-RAT 3GPP PS handover p. 6

4.2.3 Scenario 3: PS bearer suspension during CSFB p. 6

4.3 Key Issue 3: Ping-pong offloading to WLAN p. 6

4.3.1 Scenario 1: Return back to the original 3GPP RAT p. 7

4.3.2 Scenario 2: Undesirable WiFi offload during short CSFB call p. 7

5 Architecture Assumptions p. 7

6 Solutions p. 7

6.1 Solution 1 p. 7

6.1.1 Description p. 7

6.1.2 Impact on existing nodes or functionality p. 9

6.2 Solution 2 p. 9

6.2.1 Description p. 9

6.2.2 Impact on existing nodes or functionality p. 9

6.3 Solution 3 p. 9

6.3.1 Description p. 9

6.3.2 Impact on existing nodes or functionality p. 9

6.4 Solution 4 p. 10

6.4.1 Description p. 10

6.4.2 Impact on existing nodes or functionality p. 10

7 Evaluation of solutions p. 10

7.1 Solution 1 p. 10

7.2 Solution 2 p. 10

7.3 Solution 3 p. 10

7.4 Solution 4 p. 10

8 Conclusions p. 10

$ Change history p. 12