8.1 Introduction

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

The description for the PCC procedures applicable for S2c untrusted and trusted scenarios including the NS-WLAN offloaded traffic. The IP session for the UE in Fixed Broadband Access is handled as an IP-CAN session by the PCRF. For EPC-routed traffic, the IP-CAN session for the PDN Connection in the PDN GW is created via Gx procedures. In addition a Gateway Control Session is established between the BPCF and the PCRF corresponding to the EPC-routed IP-CAN session in the PCRF.

NOTE: It is up to stage 3 to optimize S9a procedures for Non-Seamless WLAN offloaded traffic and EPC routed traffic handled by the same PCRF.

The home routed roaming, LBO and non-roaming scenarios are depicted in the figure.

– 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 vice 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.