Method for adjusting the transmission time of a continuous wave and reader thereof
First Claim
1. A method for adjusting a transmission time of a continuous wave (CW), comprising:
- setting an initial value for a response waiting time;
sending the CW to a tag after sending a command to the tag and waiting for a response from the tag; and
judging whether the response from the tag is received within the response waiting time, wherein if the response from the tag is received within the responsewaiting time, then stopping sending the CW, recording a time from sending out the command to receiving the response from the tag and adjusting the response waiting time according to the recorded time; and
wherein if the response from the tag is not received beyond the response waiting time, then stopping sending of the CW.
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Accused Products
Abstract
A reader and method for adjusting the transmission time of a continuous wave (CW), wherein the method comprises setting an initial value for a response waiting time, sending the CW to a tag after sending a command to the tag and waiting for a response from the tag, judging whether the response from the tag is received within the response waiting time. If the response from the tag is received within the response waiting time, then sending of the CW is stopped and the response waiting time is adjusted. If the response from the tag is still not received beyond the response waiting time, then sending of the CW is stopped. The time for the reader to wait for a response from the tag is far less than 20 ms. Consequently, a command failure can be found early, so as to improve the processing efficiency of an RFID system.
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Citations
14 Claims
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1. A method for adjusting a transmission time of a continuous wave (CW), comprising:
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setting an initial value for a response waiting time; sending the CW to a tag after sending a command to the tag and waiting for a response from the tag; and judging whether the response from the tag is received within the response waiting time, wherein if the response from the tag is received within the response waiting time, then stopping sending the CW, recording a time from sending out the command to receiving the response from the tag and adjusting the response waiting time according to the recorded time; and wherein if the response from the tag is not received beyond the response waiting time, then stopping sending of the CW. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
wherein Tout(n−
1) represents the response waiting time before the adjustment, Tout(n) represents the response waiting time after the adjustment, λ
is a pre-set adjusting step length λ
, and min represents an operation of taking a minimum value.
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13. A reader, comprising:
- a response waiting time setting unit for pre-setting an initial value for a response waiting time;
a command processing unit for sending out a command to a tag and sending a continuous wave (CW) to the tag after sending the command and waiting for a response from the tag; and
a response waiting time adjusting unit for adjusting the response waiting time, the response waiting time adjusting unit comprising;
a response waiting time recording module for recording the time from sending out the command by the command processing unit to receiving the response from the tag; and
a response waiting time adjusting module for adjusting the response waiting time according to the time recorded by the response waiting time recording module;
wherein if the response from the tag is received by the command processing unit within the response waiting time, a response waiting time adjusting unit is triggered to adjust the response waiting time according to the time recorded by the response waiting time recording module; and
wherein if the response from the tag is not received within the response waiting time, sending of the CW is stopped. - View Dependent Claims (14)
- a response waiting time setting unit for pre-setting an initial value for a response waiting time;
Specification