MOBILE STATION APPARATUS AND TRANSMISSION POWER CONTROL METHOD

• US 20020160802A1
• Filed: 11/28/2001
• Published: 10/31/2002
• Est. Priority Date: 03/30/2000
• Status: Active Grant

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Hiramatsu, Katsuhiko, Kitade, Takashi
• Granted Patent: US 6,912,405 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters

Abstract

A propagation loss measuring section 207 appropriately changes a measuring method according to the reception type of system informed from a base station so as to measure propagation losses. A propagation loss comparator 209 compares the propagation loss between the respective cells. A transmission slot controller 210 controls a data assembling section 211 and spreader 213 in such a way to transmit a signal to a base station existing in a cell with a smaller propagation loss. A transmission power controller 208 controls a RF section 202 in such a way to transmit a signal with a transmission power value obtained by adding the propagation loss value at each cell to a target reception power value at each base station.

Claims

1. A mobile station apparatus comprising:

a measurer for measuring propagation losses of a plurality of propagation paths while changing a propagation loss measuring method according to a reception method used in a communication partner;

a controller for controlling transmission power based on the propagation losses; and

a transmitter for transmitting a signal with the transmission power through the propagation path with the minimum propagation loss.

2. The mobile station apparatus according to claim 1, wherein

said measurer measures propagation losses at a plurality of cells, and

said transmitter transmits the signal to a base station apparatus corresponding to the cell with the minimum propagation loss.

3. The mobile station apparatus according to claim 1, wherein

said measurer measures propagation losses at a plurality of sectors, and

said transmitter transmits the signal to an antenna corresponding to the sector with the minimum propagation loss.

4. The mobile station apparatus according to claim 1, wherein said measurer includes

a reception power measurer for measuring reception power of a signal obtained by combining signals received through the respective propagation paths when the communication partner combines a plurality of received signals, and for measuring reception power of each of the signals received through the respective propagation paths when the communication partner selects the signal with the best reception quality from among the plurality of received signals, and

a propagation loss measurer for measuring the propagation loss of each propagation path using the reception power and transmission power of the signal received through each propagation path at the communication partner.

5. The mobile station apparatus according to claim 1, wherein

said measurer changes the measuring method appropriately according to the reception method informed from the communication partner.

6. A base station apparatus that performs communications with a mobile station apparatus, said mobile station apparatus comprising:

a measurer for measuring propagation losses of a plurality of propagation paths while changing a propagation loss measuring method according to a reception method used in a communication partner;

a controller for controlling transmission power based on the propagation losses; and

a transmitter for transmitting a signal with the transmission power through the propagation path with the minimum propagation loss.

7. A base station apparatus that performs communications with a mobile station apparatus, wherein said base station apparatus informs said mobile station apparatus of the reception method used in the base station apparatus.

8. A transmission power control method comprising the steps of:

measuring propagation losses of a plurality of propagation paths while changing a propagation loss measuring method according to a reception method used in a communication partner;

controlling transmission power based on the propagation losses; and

transmitting a signal with the transmission power through the propagation path with the minimum propagation loss.