Terminal device communicating with contact-less IC media, and a communication method performed in the terminal device
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United States of America Patent
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Issued Date -
May 31, 2007
app pub date -
Nov 22, 2006
filing date -
Nov 29, 2005
priority date (Note) -
Abandoned
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Abstract
The terminal device of the present invention comprises a transmitting means for transmitting, to a contact-less IC medium, commands and carrier signals used for receiving responses, a receiving means for receiving responses from the contact-less IC medium, and a controlling means for controlling at least one of the transmitting means and the receiving means so as to adjust a maximum distance at which the terminal device can communicate with the contact-less IC medium. The terminal device firstly transmits an inquiry request command from the transmitting means to the contact-less IC medium, and receives an inquiry request response to the transmitted inquiry request command at the receiving means from the contact-less IC medium. Then, the terminal device transmits a data processing command from the transmitting means to the contact-less IC medium, and receives a data processing response to the transmitted data processing command at the receiving means from the contact-less IC medium. The maximum distance at which the terminal device can receive the data processing response is greater than the maximum distance at which the terminal device can receive the inquiry request response.
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