Fujitsu Corporation

Satoshi Makino

Keizo Watanabe

Hiromu Matsuzawa

Tomoatsu Takagi

Kiezo Watanabe

A mobile communication system has a plurality of communication areas being connection destinations of a mobile terminal. When a radio wave transmitted from a communication area to the mobile terminal connected to the communication area becomes an interference wave in another communication area different from the communication area, a handover target where an interference quantity may be reduced by handover is determined from at least one handover target candidates with respect to the communication area, and the mobile terminal executes forcible handover to the handover target.

Mobile communication system for reducing interference to an area

A frequency allocation method in a base station communicating wirelessly with a terminal, for dividing a cell into six areas in a clockwise direction, and allocating a frequency to each of the divided sectors, including: dividing the cell into an outer circle and an inner circle; allocating to a first terminal positioned in the outer circle of the sector, a frequency different from a frequency allocated to a second terminal positioned in an adjacent sector of the same cell, and the frequency different from a frequency allocated to a third terminal positioned in the outer circle of an adjacent sector of the adjacent cell; and allocating the frequency allocated to the first terminal to fourth and fifth terminal positioned in the inner circle of two sectors respectively arranged two sectors away from the sector in which the first terminal is positioned.

Frequency allocation method in wireless base station apparatus and wireless base station apparatus

A base station for allocating one or more sub-channels to a mobile station to perform uplink wireless communication with the mobile station through the one or more sub-channels, including an estimation unit to estimate a propagation environment for radio waves from the mobile station to the base station; a calculation unit to calculate an interference amount based on a reception power at the base station apparatus; and a determination unit to determine a modulation method, an encoding ratio, and a number of sub-channels, which are to be used by the mobile station for transmission to the base station, based on the propagation environment, the interference amount, and specification conditions of the mobile station, to notify the mobile station of the modulation method, the encoding ratio, and the number of sub-channels.

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Kawasaki, Japan

Satoshi Makino