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Content for  TS 23.161  Word version:  18.0.0

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6.7 IP flow mobility triggered by RAN WLAN interworking  6.7.1 IP flow mobility triggered by Access Stratum indication move-to-WLAN in Trusted WLAN access  6.7.1.0 General  6.7.1.1 Single-connection mode  6.7.1.2 Multi-connection mode 
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6.7  IP flow mobility triggered by RAN WLAN interworking  p. 59

6.7.1  IP flow mobility triggered by Access Stratum indication move-to-WLAN in Trusted WLAN access  p. 59

6.7.1.0  General  p. 59

The procedure is used in Network-initiated NBIFOM mode when the UE applies RAN-assisted WLAN interworking (i.e. RAN Rules) or RCLWI and the Access Stratum indicates that the UE shall move traffic to WLAN when the UE is connected simultaneously to 3GPP and TWAN access.

6.7.1.1  Single-connection mode  p. 59

Copy of original 3GPP image for 3GPP TS 23.161, Fig. 6.7.1.1-1: Procedure for Access Stratum indication move-to-WLAN via E-UTRAN using GTP S2a in SCM
Figure 6.7.1.1-1: Procedure for Access Stratum indication move-to-WLAN via E-UTRAN using GTP S2a in SCM
(⇒ copy of original 3GPP image)
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The procedure is similar to IP flow mobility triggered by indication move-from-WLAN call flows in Figure 6.7.3-1, with the following differences:
  • Step 2 Access Stratum indicates move-to-WLAN.
  • Step 3 to Step 6, the move-to-WLAN indication is sent from the UE to the PCRF instead of move-from-WLAN indication.
Copy of original 3GPP image for 3GPP TS 23.161, Fig. 6.7.1.1-2: Procedure for Access Stratum indication move-to-WLAN via UTRAN using GTP S5/S8 in SCM
Figure 6.7.1.1-2: Procedure for Access Stratum indication move-to-WLAN via UTRAN using GTP S5/S8 in SCM
(⇒ copy of original 3GPP image)
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The procedure is similar to IP flow mobility triggered by Access Stratum indication move-from-WLAN call flows in Figure 6.7.3-2, with the following differences:
  • Step 2 Access Stratum indicates move-to-WLAN.
  • Step 3 to Step 6, the move-to-WLAN indication is sent from the UE to the PCRF instead of move-from-WLAN indication.

6.7.1.2  Multi-connection mode  p. 61

Copy of original 3GPP image for 3GPP TS 23.161, Fig. 6.7.1.2-1: Procedure for Access Stratum indication move-to-WLAN for GTP S2a in MCM
Figure 6.7.1.2-1: Procedure for Access Stratum indication move-to-WLAN for GTP S2a in MCM
(⇒ copy of original 3GPP image)
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Step 1.
The UE is connected simultaneously to 3GPP and TWAN accesses. If, based on clause 5.4, the UE determines for non-radio related reasons that the WLAN access cannot be used, steps 3 to 6 are not performed.
Step 2.
Access Stratum indicates move-traffic-to-WLAN.
Step 3.
The UE sends the WLCP PDN Modification Command message including a move-to-WLAN indication.
Step 4.
The indication is sent to the PDN GW within a Bearer Resource Command.
Step 5.
When the PCRF has subscribed to such notification, the PDN GW sends the indication to the PCRF.
The PCRF may update the PCC rules, e.g. by changing the Routing Access Type of PCC Rules and provides the updated PCC rules to the PDN GW.
Step 6.
The PDN GW provides updated Routing Rules to the UE based on the updated PCC rules received from PCRF. The PDN GW may initiate dedicated bearer activation and/or modification procedure as described in WLAN according to if the IP flow shall be transported to new dedicated bearer or to existing bearer. In case IP flows are moved from 3GPP access to WLAN, the PDN GW may release the resource in the 3GPP access network. These procedures are described as per Figure 6.3.2.2.2-1 from Steps 3 to 8.
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