Communication terminal
AssigneeSony Ericsson Mobile Communications Japan, Inc.
InventorAtsuya Mori
Life of this patent
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Abstract
A system and method that detects an APC control abnormality during transmission power control to prevent circuitry from becoming faulty or damaged and eliminates the need for a pre-shipment process. A cellular phone terminal provides transmission power control. A CPU in the cellular phone terminal generates a predicted transmission power value corresponding to the power value to be transmitted through transmission power control, and compares the predicted transmission power value against a detection output value, which is obtained when a wave detector detects a transmission signal generated from a power amplifier. If the result of comparison indicates that the difference between the predicted transmission power value and detection output value is not smaller than a predetermined value, the CPU halts a signal transmission process.
Claims5
A communication terminal for exercising transmission power control to maintain the strength of a radio wave received by a base station at a certain level when wireless communication is to be established with the base station, the communication terminal comprising:
- a predicted transmission power value generation section for generating a predicted transmission power value, which corresponds to the power value to be transmitted through transmission power control;
- a detection value generation section for generating a detection value for the transmission signal to be output from an antenna;
- a gain mode selection section for selecting a high gain mode or a low gain mode;
- and
- a control section for comparing said predicted transmission power value and said detection value and halting a signal transmission operation if the difference between said predicted transmission power value and said detection value is not smaller than a predetermined value,
- wherein when the high gain mode is selected, the control section compares the predicted transmission power value with a first threshold value, and compares the detection value with a second threshold value, which is smaller than said first threshold value, and
- wherein when the low gain mode is selected, the control section compares the predicted transmission power value with a third threshold value, and compares the detection value with a fourth threshold value, which is greater than said third threshold value.
Dependencies are inferred from the claim text.