Mobile communication method, mobile station, and network device

A mobile station capable of communication in a cell of a first communication scheme and a cell of a second communication scheme, comprising:

• circuitry configured to:
• transmit a connection setup request signal containing a radio access capability of the mobile station to a network device of a first communication scheme, upon detecting a predetermined trigger while camping on in a cell of the first communication scheme;
• and
• make an attempt to set up a connection in a cell of the second communication scheme in response to an instruction signal transmitted from the network device of the first communication scheme, wherein
• the instruction signal is a signal which the network device of the first communication scheme transmits to the mobile station in a case where the radio access capability of the mobile station is contained in the received connection setup request signal, and is a signal for instructing redirection to the second communication scheme, and
• the circuitry is configured to transmit a connection setup request signal not containing the radio access capability of the mobile station, in a case where the predetermined trigger is detected but the attempt to set up the connection in the cell of the second communication scheme has been made a predetermined number of times or more within a predetermined period of time.

A network device of a first communication scheme, comprising:

• circuitry configured to:
• transmit an instruction signal for instructing redirection to a second communication scheme for a mobile station camping on in a cell of the first communication scheme, in a case where a radio access capability of the mobile station is contained in a connection setup request signal received from the mobile station;
• and
• not to transmit the instruction signal to the mobile station, in a case where the radio access capability of the mobile station is contained in the received connection setup request signal but the instruction signal has been transmitted to the mobile station a predetermined number of times or more within a predetermined period of time, wherein
• the network device does not receive, from the mobile station, the connection setup request signal unless the mobile station receives the instruction signal from the network device.