As described above, in 5GC in Example Embodiment 4 as well, the AMF 240 can perform, in consideration of a traffic characteristic of an application operating between the AF 300 and the UE 200, traffic control relating to user data transferred as control data. The AMF 240 is equivalent to the MME 100. Further, the UPF 220 can perform traffic control relating to user data, in consideration of a traffic characteristic of an application operating between the AF 300 and the UE 200. By performing such control, the AMF 240 and the UPF 220 can reduce a possibility of occurrence of a problem that a service itself provided by the application fails to operate. The problem that a service itself provided by the application fails to operate is caused by performing traffic control which does not consider a traffic characteristic of an application operating between the AF 300 and the UE 200.

Now, a modification example of Example Embodiment 4 is described. Flow of processing of sending information relating to a transmission data amount according to the modification example of Example Embodiment 4 is described by using FIG. 11. First, the AF 300 determines, as a parameter relating to the UE 200, at least one of a quota, rate control, and a charging policy (S31_1).

Next, the AF 300 transmits, to the NEF 260, an NIDD configuration request message in which the parameter determined in step S 31_1 is set (S32_1). The NIDD configuration request message may be a T 8 set suggested network configuration request message.