Content for TS 23.214 Word version: 18.0.0

1… 4.3… 5… 5.6… 5.10… 6… 6.3… 6.3.1.2 6.3.1.3… 6.3.1.6… 6.3.2… 6.3.3… 6.3.3.4… 6.3.3.7… 6.3.4… 6.3.4.2… 6.3.4.2.2 6.3.4.3 6.4… 7…

6.3.3 Updates to procedures specified in TS 23.402 [4] 6.3.3.1 Procedures with GTP based S2b establishment 6.3.3.2 Procedures with GTP based S2a establishment 6.3.3.3 Procedures with GTP based S2b release
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6.3.3 Updates to procedures specified in TS 23.402 [4] p. 55

6.3.3.1 Procedures with GTP based S2b establishment p. 55

This clause defines interactions between the CP and UP function during the following procedures:

GTP based S2b for roaming, non-roaming and LBO (clause 7.2.4 of TS 23.402).
Emergency services over GTP based S2b (clause 7.2.5 of TS 23.402).
UE-initiated connectivity to additional PDN from Un-trusted Non-3GPP IP Access with GTP (clause 7.6.3 of TS 23.402).

During the above procedures following is the nature of interactions between the CP and UP function:

The new PGW-C selects a new PGW-U and creates an Sx session.

Copy of original 3GPP image for 3GPP TS 23.214, Fig. 6.3.3.1-1: Interaction between CP and UP function with GTP based S2b establishment

Figure 6.3.3.1-1: Interaction between CP and UP function with GTP based S2b establishment
(⇒ copy of original 3GPP image)

Step 1.

Procedure as listed in this step is initiated as specified in the relevant clauses of this specification. The relevant steps of the procedure as specified in the Figure above are executed.

Step 2.

The PGW-C shall select new PGW-U as specified in clause 5.12. The PGW-C sends an Sx Session Establishment Request to the selected PGW-U for creating an Sx session for the UE.

Step 3.

The PGW-U allocates F-TEIDu for the default bearer. The PGW-U sends an Sx Session Establishment Response to the PGW-C confirming the successful creation of the Sx session. It includes the F-TEIDu it has allocated for the default bearer.

Step 4.

The relevant steps of the procedure as specified in the Figure above are executed.

6.3.3.2 Procedures with GTP based S2a establishment p. 56

This clause defines interactions between the CP and UP function during the following procedures:

UE-Initiated Connectivity to PDN in WLAN on GTP S2a (clause 16.8.1 of TS 23.402).
WLAN on GTP S2a for roaming, LBO and non-roaming scenarios (clause 16.2.1 of TS 23.402).

During the above procedures following is the nature of interactions between the CP and UP function:

The new PGW-C selects a new PGW-U and creates an Sx session.

Copy of original 3GPP image for 3GPP TS 23.214, Fig. 6.3.3.2-1: Interaction between CP and UP function with GTP based S2a establishment

Figure 6.3.3.2-1: Interaction between CP and UP function with GTP based S2a establishment
(⇒ copy of original 3GPP image)

Step 1-2.

Procedure as listed in this step is initiated as specified in the relevant clauses of this specification. The relevant steps of the procedure as specified in the Figure above are executed.

Step 3.

The PGW-C shall select new PGW-U as specified in clause 5.12 The PGW-C sends an Sx Session Establishment Request to the selected PGW-U for creating Sx session for the UE.

Step 4.

Step 5-7.

The HSS/AAA is also made aware of the PGW-C identity at this time. The relevant steps of the procedure as specified in the Figure above are then executed.

The following steps are relevant only for "WLAN on GTP S2a for roaming, LBO and non-roaming scenarios" where TWAG using the layer 3 attach request (i.e. a DHCPv4 message) is sent by the UE as the attach trigger. These steps are executed only if steps 3-7 shown in Figure 16.2.1-1 are omitted where TWAP sends the layer 2 attach trigger to the TWAG.

Step 8.

The PGW-C shall select new PGW-U as specified in clause 5.12. The PGW-C sends an Sx Session Establishment Request to the selected PGW-U for creating Sx session for the UE.

Step 9.

The PGW-U allocates F-TEIDu for the bearer. The PGW-U sends an Sx Session Establishment Response to the PGW-C confirming the successful creation of the Sx session. It includes the F-TEIDu it has allocated for the default bearer.

Step 10-11.

The relevant steps of the procedure as specified in the Figure above are executed.

6.3.3.3 Procedures with GTP based S2b release p. 57

This clause defines interactions between the CP and UP function during the following procedures:

UE/ePDG-initiated detach procedure with GTP on S2b (clause 7.4.3.1 of TS 23.402).
HSS/AAA-initiated detach procedure with GTP on S2b (clause 7.4.4.1 of TS 23.402).

During the above procedures following is the nature of interactions between the CP and UP function:

The PGW-C releases the existing Sx session from the PGW-U.

Copy of original 3GPP image for 3GPP TS 23.214, Fig. 6.3.3.3-1: Interaction between CP and UP function with release of GTP based S2b

Figure 6.3.3.3-1: Interaction between CP and UP function with release of GTP based S2b
(⇒ copy of original 3GPP image)

Step 1.

Procedure as listed in this step is initiated as specified in the relevant clauses of this specification. The relevant steps of the procedure as specified in the Figure above are executed.

Step 2.

The PGW-C sends an Sx Session Termination Request to the PGW-U to release the Sx session.

Step 3.

The PGW-U sends an Sx Session Termination Response to the PGW-C confirming the release of the Sx session.

Step 4.

The relevant steps of the procedure as specified in the Figure above are executed.