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Content for  TS 23.161  Word version:  18.0.0

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6.6.1.3 Trusted WLAN access becomes unusable  6.6.1.4 Untrusted WLAN access becomes unusable 
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6.6.1.3  Trusted WLAN access becomes unusable  p. 52

When the UE detects the TWAN access unusable, the UE shall report this event to the network via 3GPP access. The TWAN access unusable procedure is used when the UE determines that the TWAN access is not usable anymore for carrying the IP flows. The UE determines that the TWAN link is not usable when it detects loss of TWAN coverage, or TWAN radio quality preventing the usage of this access based on UE implementation mechanism. This procedure is applied in Network-initiated NBIFOM mode.
Copy of original 3GPP image for 3GPP TS 23.161, Fig. 6.6.1.3-1: Procedure for Trusted WLAN becomes unusable access for GTP S5/S8
Figure 6.6.1.3-1: Procedure for Trusted WLAN becomes unusable access for GTP S5/S8
(⇒ copy of original 3GPP image)
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Step 1.
The UE is connected simultaneously to 3GPP and WLAN accesses and establishes multiple IP flows of the same PDN connection.
Step 2.
The UE detects that the WLAN link is not usable.
Step 3.
The UE sends the Request Bearer Resource Modification message including a WLAN unusable indication.
Step 4-5.
The MME sends the indication to the PDN GW via the SGW within a Bearer Resource Command.
Step 6.
When the PCRF has subscribed to such notification, the PDN GW sends the indication to the PCRF. The PCRF may generate new Routing Rules later and should not generate Routing Rules for WLAN.
The PCRF may update the PCC rules, e.g. by changing the Routing Access Type of PCC Rules and provide the updated PCC rules to the PDN GW. The PCRF does not provide updated PCC rules for those IP flows which are forbidden to be routed in the 3GPP access.
Step 7.
The PDN GW moves all the IP flows from WLAN to 3GPP except those IP flows which are forbidden to be routed via 3GPP.
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 in 3GPP according to if the IP flow shall be transported to new dedicated bearer or to existing bearer. The PDN GW may release the resource in the WLAN access network for the IP flows which are moved to 3GPP but does not release the access from the multi-access PDN connection. Steps 3 to 7 as per Figure 6.3.2.1-1 will be invoked.
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6.6.1.4  Untrusted WLAN access becomes unusable  p. 53

When the UE detects the untrusted WLAN access unusable, the UE shall report this event to the network via 3GPP access. The untrusted WLAN access unusable procedure is used when the UE determines that the untrusted WLAN access is not usable anymore for carrying the IP flows. The UE determines that the untrusted WLAN link is not usable when it detects loss of untrusted WLAN coverage, or untrusted WLAN radio quality preventing the usage of this access based on UE implementation mechanism. This procedure is applied in Network-initiated NBIFOM mode.
Copy of original 3GPP image for 3GPP TS 23.161, Fig. 6.6.1.4-1: Procedure for Untrusted WLAN becomes unusable access for GTP S5/S8
Figure 6.6.1.4-1: Procedure for Untrusted WLAN becomes unusable access for GTP S5/S8
(⇒ copy of original 3GPP image)
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The procedure is the same as described in clause 6.6.1.3.

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