If the communications apparatus 70 is the UE in the embodiments shown in FIG. 5A and FIG. 5B, FIG. 5C and FIG. 5D, and FIG. 6A and FIG. 6B to FIG. 8A and FIG. 8B, the transceiver 701 may be configured to communicate with the AMF by using the RAN, for example, perform step S103 and step S116 in the embodiment shown in FIG. 5A and FIG. 5B, perform step S102a and step S115a in the embodiment shown in FIG. 5C and FIG. 5D, perform step S203 and step S213 in the embodiment shown in FIG. 6A and FIG. 6B, and perform step S309 and step S310 in the embodiment shown in FIG. 7A and FIG. 7B.