Direct power transmission load modulation in near field communication devices
AssigneeQUALCOMM Incorporated
InventorsAngelica Wong, Faramarz Sabouri
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Abstract
An NFC initiator device requests a passive communication mode by modulating a request onto a first carrier signal. In response thereto, the target device transmits a second carrier signal while still receiving the first carrier signal from the initiator device. The target device may modulate data onto the second carrier signal to convey information to the initiator device. The initiator device may detect changes in the load provided by the target device to interpret the data conveyed by the target device.
Claims39
A method of operating a near-field communication (NFC) device as a target device during an NFC session, the method comprising:
- receiving a polling command from an initiator device requesting a passive communication mode;
- receiving a first carrier signal from the initiator device during the NFC session;
- transmitting a second carrier signal from the target device while the first carrier signal is being received;
- and
- modulating data onto the second carrier signal.
A computer-readable medium containing program instructions that, when executed by a processor of a target device during a near-field communication (NFC) session, cause the target device to:
- receive a polling command from an initiator device requesting a passive communication mode;
- receive a first carrier signal from the initiator device during the NFC session;
- transmit a second carrier signal from the target device while the first carrier signal is being received;
- and
- modulate data onto the second carrier signal.
A near-field communication (NFC) device configured to operate as a target device during a passive communication mode, comprising:
- an antenna to receive a first carrier signal from an initiator device, wherein the first carrier signal includes a request for the passive communication mode;
- and
- a transmitter, coupled to the NFC antenna, to transmit a second carrier signal containing data to the initiator device in response to the request for the passive communication mode.
A near-field communication (NFC) device configured to operate as a target device during an NFC session, the NFC device comprising:
- means for receiving a polling command from an initiator device requesting a passive communication mode;
- means for receiving a first carrier signal from the initiator device during the NFC session;
- means for transmitting a second carrier signal from the target device while the first carrier signal is being received;
- and
- means for modulating data onto the second carrier signal.
Dependencies are inferred from the claim text.