8.2.6 Handover from Trusted Fixed Broadband Access with DSMIPv6 over S2c to 3GPP Access
23.1393GPP3GPP system - fixed broadband access network interworkingRelease 17Stage 2TS
In this scenario, the session starts in a trusted Fixed Broadband Access system using DSMIPv6 over S2c and subsequently, the session hands over to a 3GPP access system.
Figure 8.2.6-1: Fixed Broadband Access with S2c (DSMIPv6) to 3GPP access handover
If dynamic policy provisioning over S9a is not deployed, the optional step 4 does not occur. Instead, the Fixed Broadband Access network may employ local policies.
1. The UE uses a Fixed Broadband Access system. It has a DSMIPv6 session with the PDN GW.
2-3. The description of these steps is the same as for step 2-3 in TS 23 402, clause 8.4.1.
4. The PCRF (for non-roaming case) and the V-PCRF (for the home routed and visited access roaming case) executes a Gateway Control and QoS Rules Provision procedure or, if this is the last PDN Connection for the UE over Fixed Broadband Access, a PCRF-Initiated Gateway Control Session Termination Procedure with the BPCF. In roaming scenario, for the case when GTP is used on S2b, the H-PCRF will initiate the procedure over S9 towards the V-PCRF and the V-PCRF in turns initiates the procedure over S9a towards the BPCF. This procedure is triggered by the PCEF-Initiated IP‑CAN Session Modification Procedure with the PCRF, occurring as a result of step 2.
5. The resources may be released in the Fixed Broadband Access, according to an access specific release mechanism. The details of this step are out of the scope of this specification.
6. If the NS-WLAN offloaded connection is released (e.g. if the UE moves out of WLAN coverage), the Fixed Broadband Access executes the access specific resource release procedure and initiates termination of the IP-CAN session for NS-WLAN offloaded traffic as described in steps 3-5 in clause 8.1.2.