METHOD FOR OPTIMIZING NEAR FIELD LINKS
First Claim
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1. A method for coordinating data communication in a half duplex link, the method comprising:
- receiving a data packet;
determining a type of information included in said data packet;
setting a transmission delay, wherein said transmission delay accounts for said type, said transmission delay being decreased when said type indicates that data transmission on said link is active, and said transmission delay being increased when said type indicates that data transmission on the link is idle;
transmitting a data packet when a data packet is pending;
when no data packet is pending, transmitting a synchronization packet after lapse of said transmission delay.
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Abstract
In a Near Field Communications (NFC) link, the data link turn-around time is adjusted to optimize battery use while maximizing the data throughput. A receiving device immediately transmits any pending high priority control or data messages in its own queue in response to a message from the sending device, subject to the flow control status of the sending device. The value of the delay time before sending a SYMM primitive is selected in accordance with the types of link frames recently received.
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Citations
20 Claims
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1. A method for coordinating data communication in a half duplex link, the method comprising:
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receiving a data packet; determining a type of information included in said data packet; setting a transmission delay, wherein said transmission delay accounts for said type, said transmission delay being decreased when said type indicates that data transmission on said link is active, and said transmission delay being increased when said type indicates that data transmission on the link is idle; transmitting a data packet when a data packet is pending; when no data packet is pending, transmitting a synchronization packet after lapse of said transmission delay. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for coordinating data communication in a Near Field Communication link, the method comprising:
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receiving a data frame; determining a type of information included in said data frame; setting a transmission delay to zero when said type is an information frame, increasing said transmission delay when said type is a synchronization frame, otherwise setting said transmission delay to a predetermined level; transmitting a data frame when at least one data frame is pending; and when no data frame is pending, transmitting a synchronization message after lapse of said transmission delay. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A Near Field Communication device, said device comprising:
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a receiver for receiving a data frame; a transmitter for transmitting a data frame; and a transmission control component that; determines a type of information included in said data frame, sets a transmission delay to zero when said type is an information frame, increases said delay when said type is a synchronization frame, and otherwise sets said delay to a predetermined level; commands said transmitter to transmit a data frame after lapse of said delay when at least one data frame is pending; and commanding said transmitter to transmit a synchronization message after lapse of said delay when no data frame is pending. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification