Patent ID: 8548489
Filing Date: 2013-10-01
Classification: H04W

Abstract:
1. An access gateway device comprising: a storage unit configured to store an identifier of a tracking area where a mobile station is located; a table unit configured to store a table having a corresponding relationships between the tracking area and a base station managing a cell included in the tracking area; an acquisition unit configured to, when the mobile station in an active mode performs handover to a handover destination, acquire the identifier of the tracking area corresponding to the base station of the handover destination based on the table; a tracking area identifier comparison unit configured to compare the identifier of the tracking area where the mobile station in the active mode is located, the identifier of the tracking area being stored in the storage unit, with the identifier of the tracking area corresponding to the base station of the handover destination, the identifier of the tracking area being acquired by the acquisition unit; and a tracking area identifier notification unit configured to notify the mobile station in the active mode of the identifier of the tracking area corresponding to the base station of the handover destination when the identifier of the tracking area where the mobile station in the active mode is located, the identifier of the tracking area being stored in the storage unit is different from the identifier of the tracking area corresponding to the base station of the handover destination, the identifier of the tracking area being acquired by the acquisition unit, based on a comparison result by the tracking area identifier comparison unit.