1. A policy control method for a converged network, comprising:
in a roaming scenario, when receiving an IP connectivity access network (IP-CAN) session request sent by a packet data network
gateway (P-GW), a visited policy and charging rules function (V-PCRF) learning that a user equipment (UE) accesses a mobile
network through a wireless local area network (WLAN) access, and establishing a subsession serving WLAN Offload when establishing
an S9 session to a home policy and charging rules function (H-PCRF), and carrying a WLAN Offload instruction; and
the H-PCRF receiving an IP-CAN session establishment request sent by the P-GW, learning that the UE accesses the mobile network
through the WLAN access, and sending an establishment request for triggering to establish the S9 session to the V-PCRF.