Communication system, communication apparatus and communication method
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United States of America Patent
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Feb 20, 2018
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app pub date -
Jul 8, 2015
filing date -
Dec 17, 2002
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Abstract
A method for a communication device includes determining whether a first radio frequency (RF) signal at a level of at least a first predetermined field threshold is detected. The method also includes generating a second RF signal at a level of at least a second predetermined field threshold greater than the first predetermined field threshold, when the communication device receives an instruction to generate the second RF signal and the determining determines that the first RF signal at the level of at least the first predetermined field threshold is not detected. The method further includes receiving a load modulated RF signal in response to the second RF signal.
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