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A mobile station apparatus in a CDMA/TDD mobile communication system employs a communication frame including a plurality of time slots. The time slots include a plurality of forward link time slots, disposed at regular intervals in the communication frame and assigned a common control channel. The t

A mobile station apparatus in a CDMA/TDD mobile communication system employs a communication frame including a plurality of time slots. The time slots include a plurality of forward link time slots, disposed at regular intervals in the communication frame and assigned a common control channel. The time slots further include time slots other than the plurality of forward link time slots, divided into reverse link time slots and forward link time slots according to an amount of information on a forward link and on a reverse link. The mobile station apparatus includes a receiver that receives the communication frame including the plurality of time slots. A measurer measures individual reception qualities of the plurality of forward link time slots in the received communication frame including the forward link time slots assigned the common control channel. A weighter assigns a weight to each measured reception quality of the plurality of forward time slots. A transmission power controller performs transmission power control for reverse link time slots according to individual reception qualities of weighted forward link time slots.

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What is claimed is: 1. A mobile station apparatus for use in a CDMA/TDD mobile communication system in which a communication frame comprising a plurality of time slots including a plurality of forward link time slots and at least one reverse link time slot is employed, the mobile station apparatus

What is claimed is: 1. A mobile station apparatus for use in a CDMA/TDD mobile communication system in which a communication frame comprising a plurality of time slots including a plurality of forward link time slots and at least one reverse link time slot is employed, the mobile station apparatus comprising: a receiver that receives the communication frame; a measurer that measures a reception quality of each of the plurality of forward link time slots in the received communication frame including time slots to which a common control channel is assigned; a controller that increases a weight of the reception quality of a forward link time slot when a time interval between the forward link time slot and a reverse link time slot for which transmission power control is preformed decreases; and a transmission power controller that performs transmission power control for the reverse link time slot, according to the reception quality of which the weight is increased by the controller. 2. The mobile station apparatus according to claim 1, wherein: when propagation path conditions change rapidly, the controller increases the weight of the reception quality of the forward link time slot having a minimum time interval to the reverse link time slot; and when the propagation path conditions change slowly, the controller increases the weight of the reception quality of the forward link time slot that is assigned to a same channel as a channel assigned to the reverse link time slot. 3. The mobile station apparatus according to claim 1, wherein the transmission power controller combines the reception quality of which the weight is increased, to estimate propagation path conditions, and to perform an open loop transmission power control. 4. The mobile station apparatus according to claim 1, wherein the controller decreases a weight of the reception quality of the forward link time slot when the time interval between the forward link time slot and the reverse link time slot increases. 5. A transmission power control method for use in a CDMA/TDD mobile communication system in which a communication frame comprising a plurality of time slots including a plurality of forward link time slots and at least one reverse link time slot is employed, the transmission power control method comprising: receiving the communication frame; measuring a reception quality of each of the plurality of forward link time slots in the received communication frame including time slots to which a common control channel is assigned; increasing a weight of the reception quality of a forward link time slot when a time interval between the forward link time slot and a reverse link time slot for which transmission power control is performed decreases; and performing transmission power control for the reverse link time slot, according to the reception quality of which the weight is increased.