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Transmission power control method and transmission power control apparatus in mobile communication system
| Details |
Inventors: Hamabe, Kojiro;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Corsaro; Nick
Assistant Examiner: Orgad; Edan
Attorney, Agent or Firm: Dickstein, Shapiro, Morin & Oshinsky, LLP.
This invention relates to a transmission power control method and transmission power control apparatus in a mobile communication system. The reception quality of a signal (31, 32a, 32b, 41, or 42) transmitted from another mobile station (51 or 52) or base station (21 or 22) is compared with a predetermined control target value such as a signal-to-interference ratio. The comparison result is used for transmission power control on a remote station. If a frame error is detected in a transmitted signal, the control target value is increased by SIRinc. If no frame error is detected, the control target value is decreased by SIRdec. As SIRdec, the product of a target value of a frame error rate and SIRinc is set. With this operation, when a propagation environment such as multibus or moving speed changes, the control target value for transmission power control is changed within a short period of time, and channel quality is maintained constant, thus realizing desired channel quality. |
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DETAILED DESCRIPTION 1.
A transmission power control method characterized in that: reception quality of a signal transmitted from a remote station is compared with a control target value, and the comparison result is used for the transmission power control on the remote stations; and it is checked whether a frame error exists in the received signal, the control target value is increased if a frame error is detected, and the control target value is gradually decreased if no frame error is detected.
2.
A transmission control method characterized in that: a channel is established between a mobile station and a base station, reception quality of a signal transmitted from the base station is compared with a control target value in the mobile station, and the comparison result is used for transmission power control on the base station; and the mobile station checks whether a frame error exists in the receive signal, increases the control target value if a frame error is detected, and gradually decreases the control target value if no frame error is detected.
3.
A transmission control method characterized in that: a channel is established between a mobile station and a base station, reception quality of a signal transmitted from the mobile station is compared with a control target value in the base station, and the comparison result is used for transmission power control on the mobile station; and the base station checks whether a frame error exists in the received signal, increases the control target value if a frame error is detected, and gradually decreases the control target value if no frame error is detected.
4.
A transmission power control method characterized in that: diversity synthesis of signals transmitted from one or a plurality of remote stations is performed, reception quality of a synthesized signal is compared with a control target value, and the comparison result is used for transmission power control on the one or the plurality of remote stations; and it is checked whether a frame error exists in the synthesized signal, the control target value is increased if a frame error is detected, and the control target value is gradually decreased if no frame error is detected
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