When authenticating an AS 130 in Step S 23, an SCEF 110 sends, to a PGW 90, a parameter being set in a set chargeable party request message, and being determined in step S 21 (S24). The PGW 90 holds the received parameter. Thereafter, the PGW 90 transmits a response message to the SCEF 110 (S25). Next, the SCEF 110 transmits a set chargeable party response message to the AS 130 (S26).
The PGW 90 performs traffic control relating to user data transmitted from UE 60 to the AS 130, by using at least one of a quota, rate control, and a charging policy relating to the UE 60. User data targeted for traffic control may be, for example, IoT data. Further, the PGW 90 may perform traffic control relating to user data transmitted from the AS 130 to the AS UE 60.
Furthermore, the PGW 90 may transmit, to an SGW 80, at least one of a quota, rate control, and a charging policy that has been held. In this case, the SGW 80, instead of the PGW 90, may perform traffic control relating to data transmitted from the AS UE 60 to the AS 130, and the PGW 90 may perform traffic control relating to data transmitted from the AS 130 to the AS UE 60.