Radio communication system and control method

A radio communication system comprising:

• at least one user equipment;
• multiple base stations comprising a first base station configured to execute radio resource control of the user equipment through a control path, and a second base station configured not to execute radio resource control of the user equipment;
• multiple gateways comprising a first gateway connected with the first base station, and a second gateway connected with the second base station;
• and
• a switching station configured to control establishment of user paths among nodes,
• the switching station comprising:
• a switching-station-decision-unit configured to decide whether or not a gateway through which communication executed by the user equipment should be routed is the first gateway;
• and
• a switching station controller configured to, in a case in which the user equipment has executed communication via a logical session involving a first user path established between the second gateway and the second base station and a second user path established between the second base station and the user equipment, and in a case in which the switching-station-decision-unit decides that the gateway through which communication executed by the user equipment should be routed is the second gateway, control the first base station so as to release the second user path and so as to establish a third user path between the user equipment and the first base station,
• the first base station comprising:
• a first base station controller configured to control the user equipment so as to establish the third user path on the basis of control by the switching station controller,
• wherein the switching station controller is configured to control the second gateway and the second base station so as to release the first user path after establishment of the third user path.

A control method in a radio communication system comprising:

• at least one user equipment;
• multiple base stations comprising a first base station configured to execute radio resource control of the user equipment through a control path, and a second base station configured not to execute radio resource control of the user equipment;
• multiple gateways comprising a first gateway connected with the first base station, and a second gateway connected with the second base station;
• and
• a switching station configured to control establishment of user paths among nodes,
• the method comprising:
• at the switching station,
• deciding whether or not a gateway through which communication executed by the user equipment should be routed is the second gateway;
• controlling the second base station and the second gateway so as to establish a first user path for uplink from the second base station to the second gateway in a case in which it is decided that the gateway through which communication executed by the user equipment should be routed is the second gateway;
• and
• controlling the first base station and the second base station so as to establish a second user path that is a radio path between the user equipment and the second base station,
• at the first base station,
• controlling the user equipment so as to establish the second user path on the basis of control by the switching station,
• at the second base station,
• controlling the second base station and the second gateway to establish a first user path for downlink from the second gateway to the second base station.

A control method in a radio communication system comprising:

• at least one user equipment;
• multiple base stations comprising a first base station configured to execute radio resource control of the user equipment through a control path, and a second base station configured not to execute radio resource control of the user equipment;
• multiple gateways comprising a first gateway connected with the first base station, and a second gateway connected with the second base station;
• and
• a switching station configured to control establishment of user paths among nodes,
• the method comprising:
• at the switching station,
• deciding whether or not a gateway through which communication executed by the user equipment should be routed is the second gateway;
• controlling the first base station so as to release a second user path and so as to establish a third user path between the user equipment and the first base station in a case in which the user equipment has executed communication via a logical session involving a first user path established between the second gateway and the second base station and the second user path established between the second base station and the user equipment, and in a case in which it is decided that the gateway through which communication executed by the user equipment should be routed is the second gateway,
• at the first base station,
• controlling the user equipment so as to establish the third user path on the basis of control by the switching station, and
• at the switching station,
• controlling the second gateway and the second base station so as to release the first user path after establishment of the third user path.