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Method and apparatus for reducing NFC multi-protocol polling duration and power consumption

  • US 8,824,961 B2
  • Filed: 06/28/2011
  • Issued: 09/02/2014
  • Est. Priority Date: 06/28/2011
  • Status: Active Grant
First Claim
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1. A method for detecting a Near Field Communication (NFC) device, comprising:

  • polling with a first polling command using a first modulation scheme on a carrier field after a first guard time;

    maintaining the carrier field without modulation for a first reply period to detect a response to the first polling command from the NFC device;

    polling, directly after expiration of the first reply period and without waiting for a second guard time, with a second polling command using a second modulation scheme on the carrier field, the first and the second modulation schemes being characterized by a first characteristic and a second characteristic, respectively, the first characteristic being greater than the second characteristic; and

    maintaining the carrier field without modulation for a second reply period to detect a response to the second polling command from the NFC device.

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