Patent ID: 8700046
Filing Date: 2014-04-15
Classification: H04W

Abstract:
1. A mobile communication system comprising: a macro cell base station; a macro cell connected terminal wirelessly connected to the macro cell base station; a femtocell base station; a femtocell connected terminal wirelessly connected to the femtocell base station; and a network management apparatus connected to the femtocell base station and the macro cell base station, wherein: the macro cell connected terminal comprises: a measuring section that detects whether or not a femtocell base station is located in a periphery of the macro cell connected terminal; and a transmitting section that transmits, when the presence of the femtocell base station is detected in the periphery, a peripheral femtocell detection result to the macro cell base station, the macro cell base station comprises: a transmitting section that transmits an identifier of the macro cell connected terminal and the peripheral femtocell detection result to the network management apparatus based on the detection result transmitted from the macro cell connected terminal; a receiving section that receives an interference reduction instruction transmitted from the network management apparatus; and a scheduler section that limits assignment of a frequency band to the macro cell connected terminal based on the interference reduction instruction, the femtocell base station comprises: an interference control section that transmits, upon deciding that uplink quality of a femtocell of the femtocell base station cannot be maintained, an interference reduction request to the network management apparatus; and a scheduler section that limits assignment of a frequency band to the femtocell connected terminal based on the interference control instruction transmitted from the network management apparatus, the network management apparatus comprises: a storage section that stores information on a correspondence relationship between the identifier of the macro cell connected terminal and an identifier of the femtocell base station; a receiving section that receives an interference reduction request transmitted from the femtocell base station; an interference control section that determines frequency band assignment so that operating frequency bands of the femtocell base station and the macro cell base station do not overlap with each other for the macro cell connected terminal in the correspondence relationship with the femtocell base station based on the received interference reduction request and the information on the correspondence relationship stored in the storage section; and a transmitting section that transmits an interference reduction instruction including information of the frequency band assignment to the macro cell base station.