Communication system, communication apparatus, and communication method to minimize interference by transmission power control
AssigneeCanon Kabushiki Kaisha
InventorTetsuo Kanda
Life of this patent
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Abstract
There is provided a communication control technique in which it is possible to avoid interference with another wireless communication system. This invention is characterized by a control station which controls wireless communication of dependent stations. When a dependent station newly starts, the control station determines whether a beacon transmitted by the dependent station is received by another wireless communication network. When determining that the beacon is received by the other wireless communication network, the control station instructs the dependent station to lower the transmission power until the beacon is not received.
Claims9
A communication system including a control station and a plurality of dependent stations, wherein said control station of a first network includes an instruction unit configured to instruct a dependent station to transmit a predetermined signal;
- a reception unit configured to receive a signal which is transferred by the dependent station, wherein the signal has been received by the dependent station from a second network;
- a determination unit configured to determine based on the signal received by said reception unit whether a device of the second network has received the predetermined signal which has been transmitted by the dependent station, and a controlling unit configured to control transmission power of a first dependent station when the determination unit determines that the device of the second network has received the predetermined signal which has been transmitted by the dependent station, and said first dependent station includes a first transmission unit configured to transmit the predetermined signal in accordance with instruction of said control station;
- a second transmission unit configured to transfer the signal to said control station, which is transmitted by the device of the second network after the first transmission unit transmits the predetermined signal;
- a control unit configured to control transmission power in accordance with instruction of said control station.
A first communication apparatus of a first network, comprising:
- a first instruction unit configured to instruct a second communication apparatus to transmit a predetermined signal;
- a reception unit configured to receive a signal which is transferred by the second communication apparatus, wherein the signal has been received by the second communication apparatus from a third communication apparatus of a second network;
- a first determination unit configured to determine, based on the signal received by said reception unit, whether a third communication apparatus of the second network has received the predetermined signal which has been transmitted by the second communication apparatus;
- and a second instruction unit configured to instruct to control transmission power of the second communication apparatus when the first determination unit determines that the third communication apparatus of the second network has received the predetermined signal which has been transmitted by the second communication apparatus.
A communication method for a first communication apparatus, comprising steps of instructing a second communication apparatus to transmit a predetermined signal;
- receiving a signal which is transferred by a second communication apparatus, wherein the signal has been received by the second communication apparatus from a third communication apparatus of a second network;
- determining based on the signal received in a receiving step whether the third communication apparatus of the second network has received the predetermined signal which has been transmitted by the second communication apparatus;
- and instructing to control transmission power of the second communication apparatus when it is determined in a determining step that the third communication apparatus of the second network has received the predetermined signal which has been transmitted by the second communication apparatus.
Dependencies are inferred from the claim text.