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To further increase the spectrum efficiency of cellular mobile communication systems, it is important to control co-channel interference among cells. To control co-channel interference and improve spectrum efficiency over the whole cell, the authors proposed QoS-guaranteed multi-cell coordinated transmit power control, which limits the communication of some users and fully guarantees the QoS for the remaining users. On the other hand, to further increase the spectrum efficiency, it is also important to address the deterioration of communication quality at the cell edge. As one of the techniques for improving the communication quality at the cell edge, they have studied adjacent base station cooperative transmission in which simultaneously transmits signals from both own base station and adjacent base station to the cell-edge mobile terminal.
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