8.3.10 IPSec tunnel modified on S2c over untrusted Fixed Broadband Access

23.1393GPP3GPP system - fixed broadband access network interworkingRelease 17Stage 2TS

This clause is related to the case where the IPSec tunnel between the UE and the ePDG has been modified due to the UE initiated IPSec tunnel update procedure or a UE local IP address update. This procedure is only applicable if MOBIKE is supported by the UE.

Figure 8.3.10-1: IPSec tunnel modified on S2c over untrusted Fixed Broadband Access

If dynamic policy provisioning over S9a is not deployed, the optional step 4 and 5 do not occur. Instead, the Fixed Broadband Access network may employ local policies.

1. UE attaches to EPC from untrusted BBF access network via ePDG, as described in clause 8.3.1. The IPSec tunnel is established between ePDG and UE; another IPSec tunnel is established between the PDN GW and UE. This clause only defines the outer IPSec tunnel (between the UE and ePDG) modification.

2. The description of this step is the same as step 2 in clause 7.11.

3. The description of this step is the same as step 3 in clause 7.11.

4. The description of this step is the same as step A.1 in clause 7.11.

5. The description of this step is the same as step A.2 in clause 7.11.