Passive wireless memory device
First Claim
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1. A passive wireless memory device comprising:
- a memory unit; and
a passive tag to convert data stored in the memory unit into a data packet in response to first to third chronological data request signals from a reader and to transmit the data packet to the reader,wherein the passive tag determines the size of the data packet in response to a channel state predicting flag and the second and third data request signals, andwherein the second data request signal comprises a first packet size adjustment flag, and the passive tag determines a size of the data packet by referring to the channel state predicting flag and the first packet size adjustment flag.
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Abstract
A passive wireless memory device includes a memory unit and a passive tag. The passive tag converts data stored in the memory unit into a data packet in response to first to third data request signals from a reader and transmits the data packet to the reader. The passive tag determines the size of the data packet in response to the channel state predicting flag and the second and third data request signals.
20 Citations
19 Claims
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1. A passive wireless memory device comprising:
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a memory unit; and a passive tag to convert data stored in the memory unit into a data packet in response to first to third chronological data request signals from a reader and to transmit the data packet to the reader, wherein the passive tag determines the size of the data packet in response to a channel state predicting flag and the second and third data request signals, and wherein the second data request signal comprises a first packet size adjustment flag, and the passive tag determines a size of the data packet by referring to the channel state predicting flag and the first packet size adjustment flag. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An RFID reader, comprising:
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a communication unit to transmit and receive data; and a control unit to generate command packets to transmit to an RFID tag and to process response data received from the RFID tag in response to the command packets, wherein a first command packet includes at least a data request packet to instruct the RFID tag to transmit to the RFID reader data, and wherein a subsequent command packet includes a packet size adjustment flag to direct the RFID tag whether to adjust a size of a next data packet transmitted to the RFID reader based on the packet size adjustment flag and a channel state predicting flag. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An RFID tag, comprising:
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an antenna to transmit and receive data to and from a radio device; a radio communication unit to process data to transmit to, and receive from, the antenna; and a tag control unit to control a packet size of data transmitted to the antenna according to a packet size adjustment flag received in a data request subsequent to a first data request and a channel state predicting flag which indicates a detected signal characteristic of a data transmission signal between the antenna and the radio device, wherein the channel state predicting flag has at least three different values to indicate a state of the characteristic of the data transmission signal. - View Dependent Claims (18, 19)
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Specification