Method and apparatus for reducing NFC multi-protocol polling duration and power consumption
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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Abstract
A method and apparatus are disclosed for polling for near field communications (NFC) devices by checking for multiple protocols. A NFC device polls for devices by first maintaining an unmodulated carrier field active for a specific period of time. The NFC device then polls using a first modulation and waits for a response. If there is no response, and without again maintaining another unmodulated carrier field for a specific period of time, the NFC device polls using a second modulation that is greater than the first modulation and waits again for a response.
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Citations
24 Claims
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1. A method for detecting a Near Field Communication (NFC) device, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 21, 22)
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8. A method for detecting a Near Field Communication (NFC) device, comprising:
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receiving a first polling command using a first modulation scheme on a carrier field after a first guard time from a NFC reader; replying to the first polling command from the NFC reader during a first reply period if the NFC device is configured for the first modulation scheme; receiving a second polling command using a second modulation scheme on the carrier field, directly after expiration of the first reply period and without a second guard time from the NFC reader, 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 replying to the second polling command from the NFC reader during a second reply period if the NFC device is configured for the second modulation scheme. - View Dependent Claims (9, 10, 11, 12, 13, 14, 23)
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15. An apparatus for detecting a Near Field Communication (NFC) device, comprising:
a first NFC device configured to; poll with a first polling command using a first modulation scheme on a carrier field after a first guard time; maintain the carrier field without modulation for a first reply period to detect a response to the first polling command from the NFC device; poll, 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 maintain the carrier field without modulation for a second reply period to detect a response to the second polling command from the NFC device. - View Dependent Claims (16, 17, 18, 19, 20, 24)
Specification