7.1 General

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

The call flow figures in the subsequent clauses are based on TS 23 402 [3]. The home routed roaming, LBO and non-roaming scenarios are depicted. In the LBO case, the 3GPP AAA Proxy acts as an intermediary, forwarding messages from the 3GPP AAA Server in the HPLMN to the PDN GW in the VPLMN and visa versa. Messages between the PDN GW in the VPLMN and the hPCRF in the HPLMN are forwarded by the vPCRF in the VPLMN. In the non-roaming case, the vPCRF and the 3GPP AAA Proxy are not involved.

The optional PCRF interaction steps between the gateways/BPCF and the PCRF in all the procedures only occur if dynamic policy provisioning is deployed. Otherwise the gateways may employ the policies statically configured in the gateways and Fixed Broadband Access may employ Fixed Broadband Access local policies.