Transmission power control method, radio communication system, base station and mobile station
AssigneeNtt Docomo, Inc.
InventorsHidetoshi Kayama, Lan Chen, Narumi Umeda
Life of this patent
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Abstract
The object of the present invention is to provide a transmission power control method which enables the resolution of problems in a first control method for keeping the received power of packet signals in upstream radio channels constant and a second control method for keeping the SIR constant. The present invention relates to the transmission power control method for controlling the transmission power control of packet signals transmitted from a mobile station 30 via an upstream radio channel. The method comprises a step of measuring the traffic volume of the packet signals and a step of switching between the first control method and the second control method.
Claims13
A transmission power control method for controlling the transmission power of packet signals to be transmitted from a mobile station via an upstream radio channel, in a radio communication system for allowing radio communications between a base station and a plurality of mobile stations via code division multiple access (CDMA) radio channels, the method comprises the steps of:
- measuring the traffic volume of the packet signals in the base station;
- and
- switching between a first control method and a second control method based on the measured traffic volume in the base station, the first control method controlling the transmission power so as to keep the received power of the packet signals in the upstream radio channels constant, the second control method controlling the transmission power so as to keep a relationship between the received power of the packet signals and the interference power in the upstream radio channels constant.
A transmission power control method for controlling the transmission power of packet signals to be transmitted from a mobile station via an upstream radio channel, in a radio communication system for allowing radio communications between a base station and a plurality of mobile stations via code division multiple access (CDMA) radio channels, the method comprises the step of:
- controlling the transmission power so as to keep a difference between the received power of the packet signals and the interference power in the upstream radio channels constant.
A radio communication system for allowing radio communications between a base station and a plurality of mobile stations via code division multiple access (CDMA) radio channels, the system comprises:
- a measurer configured to measure the traffic volume of the packet signals transmitted from the mobile station via upstream radio channels;
- and
- a switcher configured to switch between a first control method and a second control method based on the measured traffic volume, the first control method controlling the transmission power of the packet signals in the mobile stations so as to keep the received power of the packet signals in the upstream radio channels constant, the second control method controlling the transmission power of the packet signals in the mobile stations so as to keep a relationship between the received power of the packet signals and the interference power in the upstream radio channels constant.
A base station for communicating with a plurality of mobile stations via code division multiple access (CDMA) radio channels, the base station comprises:
- a measurer configured to measure the traffic volume of the packet signals transmitted from the mobile station via upstream radio channels;
- and
- a switcher configured to switch between a first control method and a second control method based on the measured traffic volume, the first control method controlling the transmission power of the packet signals in the mobile stations so as to keep the received power of the packet signals in the upstream radio channels constant, the second control method controlling the transmission power of the packet signals in the mobile stations so as to keep a relationship between the received power of the packet signals and the interference power in the upstream radio channels constant.
A base station for communicating with a plurality of mobile stations via code division multiple access (CDMA) radio channels, wherein the base station controls the transmission power of packet signals to be transmitted from the mobile station via an upstream radio channel, so as to keep a difference between the received power and the interference power in the upstream radio channels constant.
A mobile station for communicating with abase station via code division multiple access (CDMA) radio channels, the mobile station comprises:
- a notification signal received power measurer configured to measure the received power of a notification signal transmitted from the base station;
- an extractor configured to extract the traffic volume of packet signals transmitted via upstream radio channels and a control method of the transmission power of the packet signals selected in the base station, from the notification signal;
- and
- a transmission judger configured to judge whether or not to transmit the packet signals, based on the received power of the notification signal, the traffic volume of the packet signals and the control method of the transmission power of the packet signals.
Dependencies are inferred from the claim text.