23.1393GPP3GPP system - fixed broadband access network interworkingRelease 17Stage 2TS
This clause is related to the case when the UE has an established PDN connection and wishes to establish one or more additional PDN connections.
Since DSMIPv6 is used to establish connectivity with the additional PDN, the UE does not need to establish a separate SWu instance (i.e. a separate IPSec tunnel) for each additional PDN.
There can be more than one PDN connection per APN if the PDN GW supports that feature.
Figure 8.3.9-1: UE-Initiated connectivity to additional PDN from untrusted Non-3GPP IP Access with DSMIPv6 on S2c
1. The UE has performed the Initial S2c attach procedure as defined in clause 8.3.1 and has an established PDN connection.
2. The UE repeats the procedure steps 6-9 of clause 8.3.1, Figure 8.3.1-1 (Initial attachment when S2c is used for roaming, non-roaming and LBO) for each additional PDN the UE wants to connect to. For network supporting multiple mobility protocols, if there was any dynamic IPMS decision in step 1, the AAA/HSS enforces the same IPMS decision for each additional PDN connection.
– In Step 8, if no Gateway Control session over S9a for this UE, then the PCRF initiates the Gateway Control Session Establishment procedure with the BPCF. Otherwise, the PCRF provide new QoS rules corresponding to the new PDN connection to the BPCF using the Gateway Control and QoS Rules Provisioning procedure.