A.3.2 S9 Reference Point

29.2153GPPPolicy and Charging Control (PCC) over S9 reference pointRelease 17Stage 3TS

In addition to the specification of the S9 reference point defined in clause 4, this reference point is used to trigger the V-PCRF to initiate the S9a session establishment. The S9 interface is enhanced to carry from the H-PCRF to the V-PCRF the UE local IP address, the H(e)NB local IP address the UDP source port number, if available, and the ePDG IP address derived from the ePDG IP address IE as defined in clause 7.2.1 of 3GPP TS 29.274 [22] (for GTP-based S2b access) or used as the IPSec tunnel endpoint with the UE (for untrusted S2c access), or the PDN GW IP address used as the endpoint of the DSMIPv6 IPv4 user plane tunnel or the DSMIPv6 IPv6 user plane tunnel with the UE (for trusted S2c access).