CN101414345B - Method and system for answering radio frequency identification signal, label and reader - Google Patents
Method and system for answering radio frequency identification signal, label and reader Download PDFInfo
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- CN101414345B CN101414345B CN2007101636207A CN200710163620A CN101414345B CN 101414345 B CN101414345 B CN 101414345B CN 2007101636207 A CN2007101636207 A CN 2007101636207A CN 200710163620 A CN200710163620 A CN 200710163620A CN 101414345 B CN101414345 B CN 101414345B
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Abstract
The embodiment of the invention discloses an RF identifying signal response method which comprises: receiving the command of a reader; obtaining a tolerant postback length according to the command and the tolerant postback length is confirmed by the transmission time length of a label and a mark and is at least larger than the value of one smallest time unit; generating the integral multiple of the value of the tolerant postback length as a response distance; confirming the integral multiple of the value of the tolerant postback length as the length of a response time; carrying out responding according to the length of the response time and the response distance. Correspondingly, the embodiment of the invention provides a label, a reader and an RF identifying signal response system. The technical scheme provided by the embodiment can improve the identifying efficiency of the RF identifying signal.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of answering radio frequency identification signal method and system, label and reader.
Background technology
In recent years, RFID (radio-frequency (RF) identification) uses more and more widely.RFID not only can replace present bar code, can also be applied in the logistic storage storehouse management, identification, communications and transportation, food medical treatment, the care of animal, the gate inhibition is antitheft and plurality of application scenes such as industrial military affairs, and, RFID goes for the abominable especially application scenarios of environmental baseline, so bring more facility for people's life.
Typical R FID system generally is made up of two parts, i.e. label tag and reader reader.Label is the data carrier of rfid system, and it is label ID that each label has unique identification information, and label ID is the 64bits data of fixing.Label can be attached on the destination object, with the sign destination object.The main task of reader is to replying that label emission read command signal, reception label return, and decoding identification, then, decoded information transmission to background host computer, is handled for background host computer.
Wherein a kind of method of prior art is to adopt ISO18000-3 communication protocol, and the ALOHA anti-collision algorithms that adopts no time slot not have the many labels readings of termination is carried out tag recognition.In this method, be as the minimum time unit with 1 minimum time unit, after label receives activation command, as long as label continues in the scope of signal, produce the spacing of replying of minimum time unit's integral multiple at random according to the value of 1 minimum time unit, with label ID transmission duration as response time length.Label ID transmission duration is meant the transmission shared time of label ID, and response time length is meant the time that tag responses is shared.Then, label is by described response time length with reply spacing and postback label ID to reader.The time span that minimum time unit described here is just minimum.Reader will be that label ID discerns to the signal that receives.
Below art methods is illustrated.
Suppose that the tag transmits duration is 5 minimum time units, at first reader sends a wake-up order, label tag1, and tag2 and tag3 postback, and reader is discerned.As shown in table 1, digital grid is represented replying of label, and spacing is replied in blank grid representative, and first row is the time period of replying of tag1, and second and third row is the time period of replying of tag2 and tag3.Can find so to reply, part conflict and full conflict can take place in the answering by these time periods.Conflict situations is consulted Fig. 1 simultaneously, is prior art radio frequency identification signal conflict synoptic diagram.Distinguish corresponding tag 1, tag 2, tag 3 among Fig. 1 from top to bottom.
| ?tag?1 | 22 | 23 | 24 | 25 | 26 | 40 | 41 | 42 | 43 | 44 | 62 | 63 | 64 | 65 | 66 | ||
| ?tag?2 | 27 | 28 | 29 | 30 | 31 | 49 | 50 | 51 | 52 | 53 | 64 | 65 | 66 | 67 | 68 | ||
| ?tag?3 | 20 | 21 | 22 | 23 | 24 | 47 | 48 | 49 | 50 | 51 | 64 | 65 | 66 | 67 | 68 |
The response time table of table 1 prior art label
Data are divided into left, center, right three parts in the table, and for the situation of left side triplex row, tag 1 and tag 3 reply conflict (conflicting the part conflict in the 22-24 time period), and tag 2 replys alone and decoded (the 27-31 time period is successfully discerned); For the situation of middle triplex row, tag 1 replys alone and decoded (the 40-44 time period is successfully discerned), and replying of tag 2 and tag 3 leads to a conflict (conflicting the part conflict in the 49-51 time period); For the situation of the right triplex row, replying of tag 1 and tag 2 leads to a conflict (conflicting the part conflict in the 64-66 time period), and tag 2 and replying of tag 3 lead to a conflict, (the 64-68 time period conflicts, full conflict).
In research and practice process to prior art, the inventor finds that there is following problem in prior art:
In the prior art, label is as the minimum time unit in answering with 1 minimum time unit, produce the spacing of replying of integral multiple at random according to the value of 1 minimum time unit, transmit duration as response time length with label ID, but each label ID transmission all needs a period of time, promptly has fixing label ID transmission duration, if a label has transmitted the wherein part of label ID, and at this moment the another one label begins to transmit label ID, just will cause the part conflict, if two labels begin to transmit label ID simultaneously, just will cause full conflict.Though this method can be finished reading all labels, but the situation that causes reading often takes place owing to occur partly conflicting, cause label ID correctly to be read, and the situation of part conflict is more much bigger than the probability that full conflict takes place, thereby the recognition efficiency of this method of prior art is lower.
Summary of the invention
The technical matters that the embodiment of the invention will solve provides a kind of answering radio frequency identification signal method and system, label and reader, can improve the recognition efficiency of radio frequency identification signal.
For solving the problems of the technologies described above, embodiment provided by the present invention is achieved through the following technical solutions:
The embodiment of the invention provides a kind of answering radio frequency identification signal method, comprising: receive the order of reader; Obtain acquiescence according to described order and postback length, described acquiescence postbacks that length is determined according to tag identifier transmission duration and at least greater than the value of a minimum time unit; Produce described acquiescence and postback the integral multiple of value of length as replying spacing; Determine that described acquiescence postbacks the integral multiple of value of length as response time length; Reply by described response time length and the described spacing of replying.
The embodiment of the invention provides a kind of label, comprise: receiving element, be used to receive the order of reader, obtain acquiescence according to described order and postback length, described acquiescence postbacks that length is determined according to tag identifier transmission duration and at least greater than the value of a minimum time unit; Reply the spacing unit, be used for postbacking length and produce described acquiescence and postback the integral multiple of value of length as replying spacing according to the acquiescence that described receiving element obtains; The response time length cell is used for postbacking length according to the acquiescence that described receiving element obtains and determines that described acquiescence postbacks the integral multiple of value of length as response time length; Response unit, the response time length and the described spacing of determining the spacing unit of replying of replying that are used for determining by described response time length cell are replied.
The embodiment of the invention provides a kind of reader, comprising: acquiescence postbacking length cell, be used for according to tag identifier transmission duration acquiescence being postbacked length and carry out value, and described value is at least greater than the value of a minimum time unit; Transmitting element is used for issuing to label and carries the order that described acquiescence postbacks length; Receiving element, being used to receive label is that described acquiescence postbacks the signal that the integral multiple of the value of length is replied by replying spacing and response time length.
The embodiment of the invention provides a kind of answering radio frequency identification signal system, comprise: reader, be used for acquiescence being postbacked length and carry out value, and described value is at least greater than the value of a minimum time unit, issue to label and carry the order that described acquiescence postbacks length according to tag identifier transmission duration; Label, be used to receive and obtain described acquiescence after the order of reader and postback length, produce described acquiescence and postback the integral multiple of value of length as replying spacing, determine that the integral multiple of value that described acquiescence postbacks length as response time length, replys by described response time length and the described spacing of replying.
Above technical scheme as can be seen, embodiment of the invention technical scheme is to take into full account the needed transmission duration of transmission tag identifier, reader postbacks length according to tag identifier transmission duration to acquiescence and carries out value, and label produces described acquiescence and postbacks the integral multiple of value of length as replying spacing; Determine the integral multiple of value that described acquiescence postbacks length as response time length, thereby can reduce the situation that the part conflict takes place, improve the recognition efficiency of radiofrequency signal.
Description of drawings
Fig. 1 is a prior art radio frequency identification signal conflict synoptic diagram;
Fig. 2 is the process flow diagram of embodiment of the invention answering radio frequency identification signal method;
Fig. 3 is the recognition efficiency comparison analogous diagram that postbacks length embodiment of the invention method and art methods when getting value more than or equal to label ID transmission duration when acquiescence;
Fig. 4 is the recognition efficiency comparison analogous diagram that postbacks length embodiment of the invention method and art methods when getting value less than label ID transmission duration when acquiescence;
Fig. 5 is an embodiment of the invention label construction synoptic diagram;
Fig. 6 is an embodiment of the invention reader structural representation;
Fig. 7 is an embodiment of the invention answering radio frequency identification signal system architecture synoptic diagram.
Embodiment
The embodiment of the invention provides a kind of answering radio frequency identification signal method, can improve the recognition efficiency of radio frequency identification signal.
Embodiment of the invention technical scheme is according to label ID transmission duration acquiescence to be postbacked length to carry out value, reduces or avoids the part conflict to reach, thereby improve the purpose of recognition efficiency.
Seeing also Fig. 2, is the process flow diagram of embodiment of the invention radio-frequency signal answering method, comprises step:
Label receives the order that reader issues, and described order is carried acquiescence and postbacked length, and label obtains described acquiescence and postbacks length from described order.
Be as the minimum time unit in the prior art with 1 minimum time unit, postback length as the minimum time unit with an acquiescence in the embodiment of the invention, and acquiescence postbacks length and carries out value by reader according to label ID transmission duration, and carries this acquiescence postback length in the order that is handed down to label.Label ID transmission duration generally all is the integral multiple of a minimum time unit.Reader can be got less than label ID transmission duration but postback the value of length greater than the value of a minimum time unit as acquiescence, also can get the value that postbacks length more than or equal to the value of label ID transmission duration as acquiescence, and comprise greater than the value of label ID transmission duration: the integral multiple of label ID transmission duration or non-integral multiple value, described integral multiple is greater than 1 times.
When postbacking the value of length as acquiescence, compared with prior art, can reduce the situation that the part conflict takes place when getting but greater than the value of a minimum time unit less than label ID transmission duration; When getting value more than or equal to label ID transmission duration when postbacking the value of length as acquiescence, because after can guaranteeing the intact label ID of a tag transmits, another label transmits label ID again, takes place so can stop the situation of part conflict, the only remaining situation of conflict fully that takes place.
The storage in advance in label of described label ID transmission duration, or label receives and obtains after reader issues label ID transmission duration.Because label ID is the 64bits data of fixing, if communication pattern is also fixing, transmitting the needed time span of label ID like this is that label ID transmission duration is exactly a fixing value.The also storage in advance in reader of label ID transmission duration, reader can send to label with label ID transmission duration before transmitting order to lower levels.The acquisition methods of label ID transmission duration can have a lot, can be obtained in initialization procedure by reader, also can obtain by test in practical communication.For example, during initialization, reader requires all labels to send label ID, and reader is determined label ID transmission duration according to the minimum continuous data segment that receives.
After definite acquiescence postbacked the value of length, label produced this value integer M times the spacing of replying at random according to the value that described acquiescence postbacks length, and M is not less than 1 integer.Label inside has one and replys the spacing unit, produce an integer at random as replying spacing, and this integer postback for acquiescence length value integer M doubly, can guarantee that like this zero-time unit of each tag responses time postbacks the integral multiple value of the value of length for acquiescence.
After definite acquiescence postbacked the value of length, label postbacked the value of length according to described acquiescence, determined that described acquiescence postbacks the Integer N of value of length doubly as response time length.The value that postbacks length when acquiescence is during more than or equal to label ID transmission duration, and response time length is 1 times of the value that postbacks length more than or equal to acquiescence; The value that postbacks length when acquiescence is during less than label ID transmission duration, response time length for the N of the value that postbacks length more than or equal to acquiescence doubly, the value of N is as the criterion more than or equal to label ID transmission duration to guarantee response time length.
Need to prove that above-mentioned steps 202 and step 203 do not limit order.
By above-mentioned steps definite response time span with after replying spacing, label sends label ID in reader by described response time length and the described spacing of replying, and is discerned by reader.
If the acquiescence of being got postbacks the value of length greater than label ID transmission duration, and when transmitting the integral multiple of duration for tag identifier, label quantity forwarded in a described response time length is that described integer multiple purpose same label is identified to reader, thereby improves the reliability of transmission data.
Below introduce the specific embodiment of answering radio frequency identification signal method of the present invention in detail.
Embodiment one:
If reader sends a wake-up order, tag1, tag2 and tag3 reply, and reader is discerned.The value that the acquiescence of label postbacks length is to get the value (being assumed to be 5 minimum time units) that equals label ID transmission duration, and the spacing of replying of each label postbacks the integral multiple of length for acquiescence, establishes response time length and gets 1 times of value that acquiescence postbacks length.The response time table of label is with as shown in table 2, and first row is the time period of replying of tag1, and second and third row is the time period of replying of tag2 and tag3.
| ?tag?1 | 21 | 22 | 23 | 24 | 25 | 41 | 42 | 43 | 44 | 45 | 61 | 62 | 63 | 64 | 65 | ||
| ?tag?2 | 26 | 27 | 28 | 29 | 30 | 51 | 52 | 53 | 54 | 55 | 66 | 67 | 68 | 69 | 70 | ||
| ?tag?3 | 21 | 22 | 23 | 24 | 25 | 46 | 47 | 48 | 49 | 50 | 66 | 67 | 68 | 69 | 70 |
The response time table of table 2 embodiment of the invention one label
Data are divided into left, center, right three parts in the table, and for the situation of left side triplex row, tag 1 and tag 3 reply conflict (conflicting full conflict in the 21-25 time period), and tag 2 replys alone and decoded (the 26-30 time period is successfully discerned); For the situation of middle triplex row, tag 1 replys alone and decoded (the 41-45 time period is successfully discerned), and tag 2 replys alone and decoded (the 51-55 time period is successfully discerned), and tag 3 replys alone and decoded (the 46-50 time period is successfully discerned); For the situation of the right triplex row, tag 1 replys alone and decoded (the 61-65 time period is successfully discerned), and tag 2 and tag 3 reply conflict (the 66-70 time period conflicts, full conflict).
Can find to reply, only can take place to conflict fully in the answering, and the probability of this situation be very little, because have only label to produce the situation that same random number just might occur conflicting fully by these time periods.
Embodiment two:
If reader sends a wake-up order, tag 1, tag2 and tag 3 reply, and reader is discerned.The value that the acquiescence of label postbacks length is to get the value that equals label ID transmission duration integral multiple, and described integral multiple refers to that greater than 1 times for example label ID transmission duration is assumed to be 5 minimum time units, then gets 10,15 or 20 minimum time units this moment.The spacing of replying of each label postbacks the integral multiple of length for acquiescence, establishes response time length and gets 1 times of value that acquiescence postbacks length.This situation also can comprise the transmission of whole label ID fully, avoids the part conflict situations to take place, and improves recognition efficiency.Embodiment two can postback 1 acquiescence and repeat to place label ID in the length in this case, improves the reliability of transmission data.For example giving tacit consent to the value that postbacks length is to get the value that equals 2 times of label ID transmission durations, label can postback 1 acquiescence and repeat to place 2 identical label ID in the length so, even wherein 1 is damaged in transmission course, also have other 1 label ID, thereby improve the reliability of transmission data.
Embodiment three:
If reader sends a wake-up order, tag 1, tag2 and tag 3 reply, and reader is discerned.The value that the acquiescence of label postbacks length is to get to equal the non-integral multiple value of label ID transmission duration, described integral multiple refers to greater than 1 times, for example label ID transmission duration is assumed to be 5 minimum time units, then gets 6,7 or 8 minimum time units this moment, can comprise the transmission of whole label ID fully.The spacing of replying of each label postbacks the integral multiple of length for acquiescence, establishes response time length and gets 1 times of value that acquiescence postbacks length.Though this situation will be wasted some time than embodiment one, also be to avoid the part conflict situations to take place equally, improve recognition efficiency.Postback the value of length according to the acquiescence of label, the response time table of label is with as shown in table 3, and first row is the time period of replying of tag1, and second and third row is the time period of replying of tag 2 and tag 3.
| tag1 | 19 | 20 | 21 | 22 | 23 | ?x | 37 | 38 | 39 | 40 | 41 | ?x | 61 | 62 | 63 | 64 | 64 | ?x | ||
| tag2 | 25 | 26 | 27 | 28 | 29 | ?x | 49 | 50 | 51 | 52 | 53 | ?x | 61 | 62 | 63 | 64 | 64 | ?x | ||
| tag3 | 19 | 20 | 21 | 22 | 23 | ?x | 49 | 50 | 51 | 52 | 53 | ?x | 61 | 62 | 63 | 64 | 64 | ?x |
The response time table of table 3 embodiment of the invention three labels
In table 3, it is 6 minimum time units that acquiescence postbacks the length value, each label reply the integral multiple that spacing is 6 minimum time units, response time length is got 1 times of value that acquiescence postbacks length, but label ID transmission duration is 5 minimum time units, thereby the waste of 1 minimum time unit is arranged.
Data are divided into left, center, right three parts in the table, for the situation tag 1 of left side triplex row and tag 2 reply conflict (the 19-23 time period is successfully discerned), tag 2 replys alone and decoded (the 25-29 time period is successfully discerned); For the situation of middle triplex row, tag 1 replys alone and decoded (the 37-41 time period is successfully discerned); Replying of tag 2 and tag 3 leads to a conflict (conflicting full conflict in the 49-53 time period); For the situation of the right triplex row, tag 1, tag 2 and tag 3 reply conflict (the 61-64 time period conflicts, full conflict).
Can find so to reply, then only can take place to conflict fully in the answering, and the probability of this situation be very little, because have only label to produce the situation that same random number just might occur conflicting fully by these time periods.
Embodiment four:
If reader sends a wake-up order, tag 1, tag2 and tag 3 reply, and reader is discerned.The value that the acquiescence of label postbacks length is to get less than label ID transmission duration and greater than the value of a minimum time unit.For example label ID transmission duration is assumed to be 5 minimum time units, then gets the individual minimum time unit in 4 (or 2,3) this moment.The spacing of replying of each label is the integral multiple that acquiescence postbacks length.Because want 8 minimum time units could transmit label ID, thus response time length need get acquiescence postback 2 times of value of length or more than.This situation will be wasted some time than embodiment one, though and still have the situation that the part conflict takes place, probability of happening is smaller than prior art, thereby also can improve recognition efficiency to a certain extent.
Postback the value of length according to the acquiescence of label, the response time table of label is with as shown in table 4, and first row is the time period of replying of tag 1, and second and third row is the time period of replying of tag 2 and tag 3.
| ?tag?1 | 21 | 22 | 23 | 24 | 25 | ?x | ?x | ?x | 41 | 42 | 43 | 44 | 45 | ?x | ?x | ?x | 61 | 62 | 63 | 64 | 65 | ?x | ?x | ?x | ||
| ?tag?2 | 25 | 26 | 27 | 28 | 29 | ?x | ?x | ?x | 49 | 50 | 51 | 52 | 53 | ?x | ?x | ?x | 65 | 66 | 67 | 68 | 69 | ?x | ?x | ?x | ||
| ?tag?3 | 21 | 22 | 23 | 24 | 25 | ?x | ?x | ?x | 45 | 46 | 47 | 48 | 49 | ?x | ?x | ?x | 65 | 66 | 67 | 68 | 69 | ?x | ?x | ?x |
The response time table of table 4 embodiment of the invention four labels
In table 4, it is 4 minimum time units that acquiescence postbacks the length value, each label reply the integral multiple that spacing is 4 minimum time units, response time length is got acquiescence and is postbacked 2 times of length i.e. 8 minimum time units, but label ID transmission duration is 5 minimum time units, thereby the waste of 3 minimum time units is arranged.
Data are divided into left, center, right three parts in the table, and for the situation of left side triplex row, tag 1 and tag 2 reply conflict (in the conflict of 25 time periods, the part conflict), and tag 1 and tag 3 reply conflict (conflicting full conflict in the 21-25 time period); For the situation of middle triplex row, replying of tag 1 and tag 3 leads to a conflict and (conflict of 45 time periods, part conflict); Replying of tag 2 and tag 3 leads to a conflict (in the conflict of 49 time periods, part is conflicted); For the situation of the right triplex row, tag 1 and tag 2 reply conflict (in the conflict of 65 time periods, the part conflict), and tag 2 and tag 3 reply conflict (conflicting full conflict in the 65-69 time period).
Can find, though the situation that still there is the part conflict simultaneously in embodiment four and conflicts fully, but the part conflict can reduce, and for example thereby the part conflict here has only the situation (one to three conflict that overlaps is arranged in the prior art) of the conflict that overlaps also can improve recognition efficiency.
Be the effect of better explanation embodiment of the invention technical scheme, the recognition efficiency that sees also Fig. 3 and Fig. 4 embodiment of the invention method and art methods compares analogous diagram.
Fig. 3 is the recognition efficiency comparison analogous diagram that postbacks length embodiment of the invention method and art methods when getting value more than or equal to label ID transmission duration when acquiescence.Fig. 4 is the recognition efficiency comparison analogous diagram that postbacks length embodiment of the invention method and art methods when getting value less than label ID transmission duration when acquiescence.Curve above among the figure is that embodiment of the invention method is the recognition efficiency curve of improvement project, and following curve is the recognition efficiency curve of prior art.Can find, when acquiescence postbacks length when getting value more than or equal to label ID transmission duration, embodiment of the invention method is significantly increased than the recognition efficiency of prior art, when acquiescence postbacks length when getting value less than label ID transmission duration, though hang down, but still than the recognition efficiency height of prior art than postback the recognition efficiency of length when getting value more than or equal to label ID transmission duration when acquiescence.
Foregoing describes embodiment of the invention answering radio frequency identification signal method in detail, and corresponding, the embodiment of the invention provides a kind of label, reader and answering radio frequency identification signal system.
Seeing also Fig. 5, is embodiment of the invention label construction synoptic diagram.
As shown in Figure 5, label comprise receiving element 501, reply spacing unit 502, response time length cell 503 and response unit 504.
Receiving element 501 is used to receive the order of reader, obtains acquiescence according to described order and postbacks length, and described acquiescence postbacks that length is determined according to tag identifier transmission duration and at least greater than the value of a minimum time unit.
Response time length cell 503 is used for determining that according to the value that the acquiescence that described receiving element 501 obtains postbacks length described acquiescence postbacks the Integer N of value of length doubly as response time length.The value that postbacks length when acquiescence is during more than or equal to label ID transmission duration, and response time length is 1 times of the value that postbacks length more than or equal to acquiescence; The value that postbacks length when acquiescence is during less than label ID transmission duration and greater than the value of a minimum time unit, response time length for the N of the value that postbacks length more than or equal to acquiescence doubly, the value of N is as the criterion more than or equal to label ID transmission duration to guarantee response time length.
The value that the acquiescence that receiving element 501 obtains postbacks length is for less than tag identifier transmission duration and greater than the value of a minimum time unit time, for example tag identifier transmission duration is 5 minimum time units, the value that acquiescence postbacks length is 4 or 3,2 minimum time units, though still there is the situation of part conflict and full conflict in such cases simultaneously, but the part conflict can reduce, thereby also can improve recognition efficiency.
When the value that the acquiescence that receiving element 501 obtains postbacks length postbacks the value of length for the value more than or equal to tag identifier transmission duration as acquiescence, described value greater than tag identifier transmission duration comprises: the integral multiple of tag identifier transmission duration or non-integral multiple value, described integral multiple is greater than 1 times.For example suppose that tag identifier transmission duration is 5 minimum time units, the value that acquiescence postbacks length is 10,15 or 20 minimum time units, these all are the integral multiples of tag identifier transmission duration, in addition, the value that acquiescence postbacks length also can be 6,7 or 9 minimum time units, and these all are the non-integral multiple of tag identifier transmission duration.These several value condition can be stopped the part conflict situations in the tag responses process, and the only remaining situation of conflict fully, and the probability of happening of this situation is very little, because have only label to produce the situation that full conflict just might appear in same random number, thereby above-mentioned value can significantly improve reader postbacks signal to label discrimination.
In addition, when acquiescence postbacks length more than or equal to the N of tag identifier transmission duration doubly, described response unit 504 sends the quantity that same label is identified to reader and is at least N in a described response time length, and wherein N is not less than 1 integer.For example giving tacit consent to the value that postbacks length is the value that equals 2 times of tag identifier transmission durations, label can 1 acquiescence postbacks and repeats to place 2 identical tag identifiers in the length so, even wherein 1 is damaged in transmission course, also have other 1 tag identifier, thereby improve the reliability of transmission data.
Seeing also Fig. 6, is embodiment of the invention reader structural representation.
As shown in Figure 6, reader comprises: acquiescence postbacks length cell 601, transmitting element 602 and receiving element 603.
Acquiescence postbacking length cell 601, be used for according to tag identifier transmission duration acquiescence being postbacked length and carry out value, and described value is at least greater than the value of a minimum time unit.
Transmitting element 602 is used for issuing to label and carries the order that described acquiescence postbacks length.
Receiving element 603, being used to receive label is that described acquiescence postbacks the signal that the integral multiple of the value of length is replied by replying spacing and response time length.
Acquiescence postbacks length cell 601 and further comprises the first value unit 6011 and the second value unit 6012.
The first value unit 6011 is used to get less than tag identifier transmission duration and postbacks the value of length greater than the value of a minimum time unit as acquiescence.Label receives after this acquiescence postbacks length, get response time length for the N of the value that postbacks length more than or equal to acquiescence doubly, the value of N is as the criterion more than or equal to label ID transmission duration to guarantee response time length.
The second value unit 6012 is used to get the value that postbacks length more than or equal to the value of tag identifier transmission duration as acquiescence.Label receives after this acquiescence postbacks length, gets response time length 1 times for the value that postbacks length more than or equal to acquiescence.
Seeing also Fig. 7, is embodiment of the invention answering radio frequency identification signal system architecture synoptic diagram.
As shown in Figure 7, the answering radio frequency identification signal system comprises: reader 70 and label 71.
Label 71, be used to receive and obtain described acquiescence after the order of reader 70 and postback length, produce described acquiescence and postback the integral multiple of value of length as replying spacing, determine that the integral multiple of value that described acquiescence postbacks length as response time length, replys by described response time length and the described spacing of replying.
The structure of label 71 and reader 70 can be consulted above-mentioned Fig. 5 and Fig. 6 describes.
Get when postbacking the value of length less than tag identifier transmission duration and greater than the value of a minimum time unit as acquiescence when the first value unit 6011 that the acquiescence of reader 70 postbacks length cell 601, the transmitting element 602 of reader 70 issues to label 71 and carries the order that described acquiescence postbacks length; Accordingly, described label 71 is got the N of value that described acquiescence postbacks length doubly as response time length, and the N of value that described acquiescence postbacks length is doubly more than or equal to described tag identifier transmission duration, and wherein N is not less than 1 integer.
Get value more than or equal to tag identifier transmission duration when postbacking the value of length as acquiescence when the second value unit 6012 that the acquiescence of reader 70 postbacks length cell 601, the transmitting element 602 of reader 70 issues to label 71 and carries the order that described acquiescence postbacks length; Accordingly, described label 71 is got at least 1 times of value that described acquiescence postbacks length as response time length.
Get acquiescence and postback length doubly when the acquiescence of reader 70 postbacks length cell 601 more than or equal to the N of tag identifier transmission duration; Described label 71 sends in a described response time length with tag identifier and is at least N to the quantity of reader 70, and wherein N is not less than 1 integer.For example giving tacit consent to the value that postbacks length is the value that equals 2 times of tag identifier transmission durations, label 71 can postback 1 acquiescence and repeat to place 2 identical tag identifiers in the length so, even wherein 1 is damaged in transmission course, also have other 1 tag identifier, thereby improve the reliability of transmission data.
Above technical scheme as can be seen, label the situation that part conflict causes reading occurs and often takes place in the prior art in answering, make that the recognition efficiency of radiofrequency signal is lower, and embodiment of the invention technical scheme is to take into full account the needed transmission duration of transmission tag identifier, reader postbacks length according to tag identifier transmission duration to acquiescence and carries out value, and label produces described acquiescence at random and postbacks the integral multiple of value of length as replying spacing; Determine the integral multiple of value that described acquiescence postbacks length as response time length, thereby can reduce the situation that the part conflict takes place, improve the recognition efficiency of radiofrequency signal.
Further, embodiment of the invention technical scheme reader can be got less than tag identifier transmission duration but postback the value of length greater than the value of a minimum time unit as acquiescence, perhaps, get the value that postbacks length more than or equal to the value of tag identifier transmission duration as acquiescence.When getting value more than or equal to tag identifier transmission duration when postbacking the value of length as acquiescence, can stop the part conflict situations in the tag responses process, and the only remaining situation of conflict fully, thereby can significantly improve reader postbacks signal to label discrimination.When postbacking the value of length when getting less than tag identifier transmission duration but greater than the value of a minimum time unit as acquiescence, though still there is the situation of part conflict and full conflict simultaneously, part is conflicted and can be reduced, thereby also can improve recognition efficiency.
Further, the value that embodiment of the invention technical scheme reader is got greater than tag identifier transmission duration comprises: the integral multiple of tag identifier transmission duration or non-integral multiple value, described integral multiple is greater than 1 times.When the value greater than tag identifier transmission duration of being got is the integral multiple of tag identifier transmission duration, label can be that described integer multiple purpose same label is identified to reader with replying the spacing quantity forwarded by described response time length, thereby improves the reliability of transmission data.
More than a kind of answering radio frequency identification signal and system, label and reader that the embodiment of the invention provided are described in detail, for one of ordinary skill in the art, thought according to the embodiment of the invention, part in specific embodiments and applications all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (17)
1. an answering radio frequency identification signal method is characterized in that, comprising:
Receive the order of reader;
Obtain acquiescence according to described order and postback length, described acquiescence postbacks that length is determined according to tag identifier transmission duration and at least greater than the value of a minimum time unit;
Produce described acquiescence and postback the integral multiple of value of length as replying spacing;
Determine that described acquiescence postbacks the integral multiple of value of length as response time length;
Reply by described response time length and the described spacing of replying.
2. answering radio frequency identification signal method according to claim 1 is characterized in that:
Described acquiescence postbacks length and determines to be specially according to tag identifier transmission duration: get the value that postbacks length less than the value of tag identifier transmission duration as acquiescence;
Accordingly, determine that the integral multiple that described acquiescence postbacks the value of length is specially as response time length:
Get the N of value that described acquiescence postbacks length doubly as response time length, and the N of value that described acquiescence postbacks length is doubly more than or equal to described tag identifier transmission duration, wherein N is not less than 1 integer.
3. answering radio frequency identification signal method according to claim 1 is characterized in that:
Described acquiescence postbacks length and determines to be specially according to tag identifier transmission duration: get the value that postbacks length more than or equal to the value of tag identifier transmission duration as acquiescence;
Accordingly, determine that the integral multiple that described acquiescence postbacks the value of length is specially as response time length:
Get at least 1 times of value that described acquiescence postbacks length as response time length.
4. answering radio frequency identification signal method according to claim 3 is characterized in that:
When described acquiescence postbacks length more than or equal to N times of tag identifier transmission duration, reply and be specially by described response time length and the described spacing of replying:
Label sends the quantity that same label is identified to reader and is at least N in a described response time length, wherein N is not less than 1 integer.
5. according to each described answering radio frequency identification signal method of claim 1 to 4, it is characterized in that:
Described tag identifier transmission duration is for being stored in the tag identifier transmission duration in the reader in advance, or label receives tag identifier transmission duration that reader issues or label storage tags sign transmission duration in advance.
6. a label is characterized in that, comprising:
Receiving element is used to receive the order of reader, obtains acquiescence according to described order and postbacks length, and described acquiescence postbacks that length is determined according to tag identifier transmission duration and at least greater than the value of a minimum time unit;
Reply the spacing unit, be used for postbacking length and produce described acquiescence and postback the integral multiple of value of length as replying spacing according to the acquiescence that described receiving element obtains;
The response time length cell is used for postbacking length according to the acquiescence that described receiving element obtains and determines that described acquiescence postbacks the integral multiple of value of length as response time length;
Response unit, the response time length and the described spacing of determining the spacing unit of replying of replying that are used for determining by described response time length cell are replied.
7. label according to claim 6 is characterized in that:
The value that the acquiescence that described receiving element obtains postbacks length is less than tag identifier transmission duration and greater than the value of a minimum time unit;
The described response time length that described response time length cell is determined be the described acquiescence value that postbacks length N doubly, and more than or equal to described tag identifier transmission duration, wherein N is not less than 1 integer.
8. label according to claim 6 is characterized in that:
The acquiescence that described receiving element obtains postbacks the value of the value of length more than or equal to tag identifier transmission duration;
The described response time length that described response time length cell is determined is at least described acquiescence and postbacks 1 times of length.
9. label according to claim 8 is characterized in that:
Described acquiescence postbacks length more than or equal to the N of tag identifier transmission duration doubly, and described response unit sends the quantity that same label is identified to reader and is at least N in a described response time length, and wherein N is not less than 1 integer.
10. a reader is characterized in that, comprising:
Acquiescence postbacking length cell, be used for according to tag identifier transmission duration acquiescence being postbacked length and carry out value, and described value is at least greater than the value of a minimum time unit;
Transmitting element is used for issuing to label and carries the order that described acquiescence postbacks length;
Receiving element, being used to receive label is that described acquiescence postbacks the signal that the integral multiple of the value of length is replied by replying spacing and response time length.
11. reader according to claim 10 is characterized in that:
Described acquiescence postbacks length cell and comprises the first value unit, is used to get less than tag identifier transmission duration and postbacks the value of length greater than the value of a minimum time unit as acquiescence.
12. reader according to claim 10 is characterized in that:
Described acquiescence postbacks length cell and comprises the second value unit, is used to get the value that postbacks length more than or equal to the value of tag identifier transmission duration as acquiescence.
13. an answering radio frequency identification signal system is characterized in that, comprising:
Reader is used for according to tag identifier transmission duration acquiescence being postbacked length and carries out value, and described value is at least greater than the value of a minimum time unit, issues to label and carries the order that described acquiescence postbacks length;
Label, be used to receive and obtain described acquiescence after the order of reader and postback length, produce described acquiescence and postback the integral multiple of value of length as replying spacing, determine that the integral multiple of value that described acquiescence postbacks length as response time length, replys by described response time length and the described spacing of replying.
14. answering radio frequency identification signal according to claim 13 system is characterized in that described reader comprises:
Acquiescence postbacking length cell, be used for according to tag identifier transmission duration acquiescence being postbacked length and carry out value, and described value is at least greater than the value of a minimum time unit;
Transmitting element is used for issuing to label and carries the order that described acquiescence postbacks length.
15. answering radio frequency identification signal according to claim 14 system is characterized in that:
Described acquiescence postbacks length cell and comprises the first value unit, is used to get less than tag identifier transmission duration and postbacks the value of length greater than the value of a minimum time unit as acquiescence;
The described response time length that described label produces be the described acquiescence value that postbacks length N doubly, and more than or equal to described tag identifier transmission duration, wherein N is not less than 1 integer.
16. answering radio frequency identification signal according to claim 14 system is characterized in that:
Described acquiescence postbacks length cell and comprises the second value unit, is used to get the value that postbacks length more than or equal to the value of tag identifier transmission duration as acquiescence;
The described response time length that described label produces is at least described acquiescence and postbacks 1 times of length.
17. answering radio frequency identification signal according to claim 16 system is characterized in that:
Described acquiescence postbacks length cell and gets acquiescence and postback length more than or equal to the N of tag identifier transmission duration doubly;
Described label sends the quantity that same label is identified to reader and is at least N in a described response time length, wherein N is not less than 1 integer.
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| CN2007101636207A CN101414345B (en) | 2007-10-15 | 2007-10-15 | Method and system for answering radio frequency identification signal, label and reader |
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| CN2007101636207A CN101414345B (en) | 2007-10-15 | 2007-10-15 | Method and system for answering radio frequency identification signal, label and reader |
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| CN101414345B true CN101414345B (en) | 2011-06-08 |
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| CN105701430B (en) * | 2014-11-27 | 2018-02-23 | 广东电网有限责任公司电力科学研究院 | A kind of method for preventing from misreading mobile object reading area external information |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5818348A (en) * | 1995-03-13 | 1998-10-06 | Motorola, Inc. | Method and radio frequency identification system for a novel protocol for reliable communication |
| CN1949244A (en) * | 2005-10-10 | 2007-04-18 | 上海真灼电子技术有限公司 | Method of multi reading writing device coordinated working for radio frequency identifying system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5818348A (en) * | 1995-03-13 | 1998-10-06 | Motorola, Inc. | Method and radio frequency identification system for a novel protocol for reliable communication |
| CN1949244A (en) * | 2005-10-10 | 2007-04-18 | 上海真灼电子技术有限公司 | Method of multi reading writing device coordinated working for radio frequency identifying system |
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