Radio communication system, radio communication method, and gateway

A radio communication method in a radio communication system in which a mobile station (MS) is connected to a network through a base station (BS) to conduct a machine-to-machine (M2M) communication, the radio communication system comprising:

• a gateway (GW) disposed between the BS and the network;
• and
• an MS information storage device that transmits and receives MS information with respect to the GW, wherein
• the gateway includes:
• a call session management table that stores an MSID which is an identifier of the MS, state information indicating whether a session of the MS is in an active state or an idle state, and an external index (ext. index) with respect to a call number (call No.) allocated to the MS when the MS is connected to the BS;
• an active session management table that stores the MS information which is information on the MS with the inclusion of an address of the MS with respect to the call No.;
• an idle session management table that stores paging information on the MS with respect to the call No.;
• and
• a control unit that executes migration processing between the active state and the idle state,
• wherein,
• when the MS requests migration from the active state to the idle state,
• the gateway receives an idle migration request including an MSID from the BS, and searches the call No. on the basis of the MSID included in the idle migration request with reference to the call session management table,
• the gateway searches an area in which the paging information is null with reference to the idle session management table according to the call No., and sets the paging information on the MS for the searched area,
• the gateway searches the MS information with reference to the active session management table according to the call No., and transmits a first MS information transfer request including the MS information corresponding to the call No. to the MS information storage device,
• when receiving a first MS information transfer response including the ext. index corresponding to the MS information stored in the MS information storage device from the MS information storage device, the gateway acquires the ext. index included in the first MS information transfer response,
• the gateway changes the state information from the active state to the idle state with respect to the call No. and the MSID, stores the idle state to the state information in the call session management table, and stores the acquired ext. index, and
• the gateway deletes the call No. and the MS information corresponding to the call No. from the active session management table,
• whereby the paths for the data connection among the MS, the BS and the gateway are disconnected, and the path for the data connection between the gateway and the network is not disconnected.

A gateway in a radio communication system in which a mobile station (MS) is connected to a network through a base station (BS) to conduct a machine-to-machine (M2M) communication, the radio communication system comprising:

• the gateway (GW) disposed between the BS and the network;
• and
• an MS information storage device that transmits and receives MS information with respect to the GW, wherein
• the gateway includes:
• a call session management table that stores an MSID which is an identifier of the MS, state information indicating whether a session of the MS is in an active state or an idle state, and an external index (ext. index) with respect to a call number (call No.) allocated to the MS when the MS is connected to the BS;
• an active session management table that stores the MS information which is information on the MS with the inclusion of an address of the MS with respect to the call No.;
• an idle session management table that stores paging information on the MS with respect to the call No.;
• and
• a control unit that executes migration processing between the active state and the idle state,
• wherein,
• when the MS requests migration from the active state to the idle state,
• the gateway receives an idle migration request including an MSID from the BS, and searches the call No. on the basis of the MSID included in the idle migration request with reference to the call session management table,
• the gateway searches an area in which the paging information is null with reference to the idle session management table according to the call No., and sets the paging information on the MS for the searched area,
• the gateway searches the MS information with reference to the active session management table according to the call No., and transmits a first MS information transfer request including the MS information corresponding to the call No. to the MS information storage device,
• when receiving a first MS information transfer response including the ext. index corresponding to the MS information stored in the MS information storage device from the MS information storage device, the gateway acquires the ext. index included in the first MS information transfer response,
• the gateway changes the state information from the active state to the idle state with respect to the call No. and the MSID, stores the idle state to the state information in the call session management table, and stores the acquired ext. index, and
• the gateway deletes the call No. and the MS information corresponding to the call No. from the active session management table,
• whereby the paths for the data connection among the MS, the BS and the gateway are disconnected, and the path for the data connection between the gateway and the network is not disconnected.