6.5 Removal of an access from a PDN connection

23.1613GPPNetwork-Based IP Flow Mobility (NBIFOM)Release 17Stage 2TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

6.5.1 Removal of 3GPP access

6.5.1.1 UE-initiated removal of 3GPP access from the PDN connection

In the case of E-UTRAN, when the UE removes the 3GPP access for the multi-access PDN connection and the multiple-access PDN connection is not the last PDN connection for 3GPP access, procedures as described in TS 23.401 [4] clause 5.10.3 are referred with the following modifications.

Figure 6.5.1.1-1: UE-Initiated Removal of 3GPP access via E-UTRAN

Step 5: PDN GW shall indicate to the PCRF the removal of 3GPP access for the multi-access PDN connection via IP-CAN Session Modification procedure, if dynamic PCC is applied for the PDN connection.

In the case of E-UTRAN, when the UE removes the 3GPP access for the multi-access PDN connection and the multiple-access PDN connection is the last PDN connection for 3GPP access, procedures as described in TS 23.401 [4] clause 5.3.8.2.1 are referred with the following modifications.

Figure 6.5.1.1-2: UE-Initiated Removal of 3GPP access via E-UTRAN for last PDN connection

Step 8: PDN GW shall indicate to the PCRF the removal of 3GPP access for the multi-access PDN connection via IP-CAN Session Modification procedure, if dynamic PCC is applied for the PDN connection.

In the case of GERAN/UTRAN, when the UE removes the 3GPP access for the multi-access PDN connection, procedures as described in TS 23.060 [5] clause 9.2.4 are referred with the following modifications.

Figure 6.5.1.1-3: UE-Initiated Removal of 3GPP access via GERAN/UTRAN

Step-5: PDN GW shall indicate to the PCRF the removal of 3GPP access for the multi-access PDN connection via IP-CAN Session Modification procedure, if dynamic PCC is applied for the PDN connection.

6.5.1.2 Network-initiated removal of 3GPP access from the PDN connection

In the case of E-UTRAN, when the network removes the 3GPP access for the multi-access PDN connection, the following procedures are referred.

Figure 6.5.1.2-1: Network initiated removal of 3GPP access via E-UTRAN from the PDN connection

1. The PCRF shall indicate to the P-GW the removal of 3GPP access for the multi-access PDN connection via IP-CAN Session Modification procedure by updating or removing all PCC rules that are bound to this access.

2-9. The description of these steps is the same as for steps 2-9 in TS 23.401 [4], clause 5.4.4.1. The P-GW deactivates the default bearer of this access.

10. The P-GW shall indicate to the PCRF the 3GPP access is removed from the multi-access PDN connection.

11. The description of these steps is the same as for steps 11 in TS 23.401 [4], clause 5.4.4.1.

The optional interaction steps between the PDN GW and the PCRF in the procedures only occur if dynamic PCC is applied for the PDN connection.

In the case of GERAN/UTRAN, when the network removes the 3GPP access for the multi-access PDN connection, the following procedures are referred.

Figure 6.5.1.2-2: Network initiated Removal of 3GPP access via GERAN/UTRAN

2-3. The description of these steps is the same as for steps A-B in TS 23.060 [5], clause 9.2.4.3A.

4-5. The description of these steps is the same as for steps 2 in TS 23.060 [5], clause 9.2.4.3.

6-7. The description of these steps is the same as for steps A-B in TS 23.060 [5], clause 9.2.4.3B.

8. The description of these steps is the same as for steps 4-5 in TS 23.060 [5], clause 9.2.4.3.

9. The P-GW shall indicate to the PCRF the 3GPP access is removed from the multi-access PDN connection.

The optional interaction steps between the PDN GW and the PCRF in the procedures only occur if dynamic PCC is applied for the PDN connection.

6.5.2 Removal of Trusted WLAN access

6.5.2.1 UE-initiated removal of Trusted WLAN access from a PDN connection

When the UE removes the TWAN access for the multi-access PDN connection in single-connection mode, procedures as described in TS 23.402 [2] clause 16.3.1.1 are referred with the following modification.

Figure 6.5.2.1-1: UE-initiated Removal of Trusted WLAN access from the PDN connection for single-connection mode

Step 4: PDN GW shall indicate to the PCRF the removal of TWAN access for the multi-access PDN connection via IP-CAN Session Modification procedures, if dynamic PCC is applied for the PDN connection.

When the UE removes the TWAN access for the multi-access PDN connection for multi-connection mode and the multi-access PDN connection is not the last PDN connection in TWAN, procedures as described in TS 23.402 [2] clause 16.9.1 are referred with the following modification.

Figure 6.5.2.1-2: UE-initiated Removal of Trusted WLAN access from the PDN connection for multi-connection mode

Step 4: PDN GW shall indicate to the PCRF the removal of TWAN access for the multi-access PDN connection via IP-CAN Session Modification procedures, if dynamic PCC is applied for the PDN connection.

When the UE removes the TWAN access for the multi-access PDN connection for multi-connectoin mode and the multi-access PDN connection is not the last PDN connection in TWAN, procedures as described in TS 23.402 [2] clause 16.7.1.1 are referred with the following modification.

Figure 6.5.2.1-3: UE-initiated Removal of Trusted WLAN access from the last PDN connection for multi-connection mode

Step 4: PDN GW shall indicate to the PCRF the removal of TWAN access for the multi-access PDN connection via IP-CAN Session Modification procedures, if dynamic PCC is applied for the PDN connection.

6.5.2.2 Network-initiated removal of Trusted WLAN access from a PDN connection

When the network removes the TWAN access for the multi-access PDN connection, the following procedures shall be applied.

Figure 6.5.2.2-2: Network-initiated Removal of Trusted WLAN access from the PDN connection

1. The PCRF shall indicate to the P-GW the removal of WLAN access for the multi-access PDN connection via IP-CAN Session Modification procedure by updating or removing all PCC rules that are bound to this access.

2-7. The description of these steps is the same as for steps 2-7 in TS 23.402 [2], clause 16.4.1. The P-GW deactivates the default bearer of this access.

8. The P-GW shall indicate to the PCRF the WLAN access is removed from the multi-access PDN connection.

The optional interaction steps between the PDN GW and the PCRF in the procedures only occur if dynamic PCC is applied for the PDN connection.

6.5.3 Removal of Untrusted WLAN access

6.5.3.1 UE-initiated removal of Untrusted WLAN access from the PDN connection

When the UE remove from the WLAN access for the multi-access PDN connection, the following procedures shall be applied.

Figure 6.5.3.1-1: UE-initiated Removal of Untrusted WLAN access from the PDN connection

1. The description of these steps is the same as for steps 1 in TS 23.402 [2], clause 7.4.1.1.

2-3. The description of these steps is the same as for steps A.1-A.2 in TS 23.402 [2], clause 7.4.3.1.

4. The P-GW indicates to the PCRF the WLAN access is removed from the multi-access PDN connection, if dynamic PCC is applied for the PDN connection.

5. The description of these steps is the same as for steps A.3 in TS 23.402 [2], clause 7.4.3.1.

6. The description of these steps is the same as for steps 6 in TS 23.402 [2], clause 7.4.1.1.

6.5.3.2 Network-initiated removal of Untrusted WLAN access from a PDN Connection

When the Network removes the Untrusted WLAN access for the multi-access PDN connection, the following procedures shall be applied.

Figure 6.5.3.2-1: Network-initiated Removal of Untrusted WLAN access from the PDN connection

2-5. The description of these steps is the same as for steps 2-5 in TS 23.402 [2], clause 7.9.2. The P-GW deactivates the default bearer of this access.

6. The P-GW shall indicate to the PCRF the WLAN access is removed from the multi-access PDN connection.

The optional interaction steps between the PDN GW and the PCRF in the procedures only occur if dynamic PCC is applied for the PDN connection.