A terminal device includes a transmitter configured to transmit terminal identification information for identifying the terminal device to a base station of a radio communication network; a receiver configured to receive an acknowledgment from the base station in response to the terminal identification information, and to receive an authentication request for authenticating a further terminal device for peer-to-peer communications from the further terminal device; the transmitter being configured to transmit an acknowledgement to the further terminal device for authenticating the further terminal device for the peer-to-peer communications.