CN1845125A - Anti-collision system and method for simultaneously reading multi label - Google Patents
Anti-collision system and method for simultaneously reading multi label Download PDFInfo
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- CN1845125A CN1845125A CN 200610080837 CN200610080837A CN1845125A CN 1845125 A CN1845125 A CN 1845125A CN 200610080837 CN200610080837 CN 200610080837 CN 200610080837 A CN200610080837 A CN 200610080837A CN 1845125 A CN1845125 A CN 1845125A
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Abstract
The invention discloses a system for anti-collision when reading several labels at one time. Said system (1) comprises: a reader (2) and several labels (3). Wherein, the reader can read the serial numbers stored in the labels via wireless. The inventive method comprises: the label, in each time frame, randomly selects a time space to transmit the serial number, while the time space number of each time frame is dynamically distributed; and in the micro time space at the front of each time frame, the system sends a random number to attain the data at the time space at the back of said time frame, in advanced, to order the serial number of label in the normal transmission.
Description
Technical field
The present invention relates to a kind of radio frequency identification (RFID) technology, especially a kind of system and method that reads the anticollision of a plurality of RFID labels simultaneously.
Background technology
The English name of radio frequency identification is RFID (Radio Frequency Identification), and it is a kind of of contactless automatic identification technology.The simplest rfid system is made up of label (Tag), reader (Reader) and information processing subsystem three parts.Its principle of work is also uncomplicated: after label enters magnetic field, receive the radiofrequency signal that reader sends, rely on the energy that induction current obtained to send out product information (the Passive Tag that is stored in the chip, passive label or passive label), perhaps initiatively send the signal (Active Tag, active label or active tag) of a certain frequency; After reader reads information and decoding, deliver to information handling system and carry out the relevant data processing.
REID has the advantage of fast processing, and this is because REID can be carried out a plurality of labels and be discerned simultaneously, and promptly reader can identify simultaneously to enter and read an interior a plurality of label.Yet have such problem in the REID: when a plurality of labels respond the signal of reader and when sending information simultaneously, thereby will cause that signal collision makes correctly identification label of reader, this phenomenon is known as the label collision.
The present invention is at the label collision problem that exists in the REID, proposes new improvement based on existing collision-proof method, thereby makes reader can correctly identify a plurality of labels more efficiently, to improve the overall performance of system.
United States Patent (USP) 5521601 discloses the power effective technology of distinguishing a plurality of labels.This patent provides label recognition system and method, is used to be identified in a label of reading in the field.Label is divided into less grouping and in grouping of a period of time identification in this patent, so by making not the label breakpoint in current identification group save energy.Each label is with they stored parameters and calculate they oneself are put into a group from the parameter that reader receives separately.This reception needs many transmitter units and complicated positioning unit.
The collision-proof method of following two kinds of methods as many tag recognition disclosed in the ISO18000-6 air-interface standard of ISO (International Standards Organization): binary tree searching method and dynamic branch frame slot Aloha method.
Wherein the anticollision process of binary tree searching method is roughly as follows: all labels send to reader with sequence number after receiving the interrogating signal of reader simultaneously in reading, reader is determined the data bit that label bumps according to a plurality of sequence numbers that receive in transmission course, according to these data bit that bump sequence number is carried out set one by one then and search for a label of reading in the field.This method needs label to carry out the synchronous of strictness before sending data, and because the data interaction between reader and the label is more frequent, so required logical bandwidth ratio is bigger in the communication process.
Be similar to above-mentioned this binary tree searching method, China's Granted publication number be CN 1165865C patent disclosure a kind of method.This method comprises, send an interrogating signal that comprises a plurality of parts from reader, each part is corresponding to a pre-determined bit of tag serial number, and can transmit this set-point, wherein the label of showing this value in pre-determined bit is configured to modulate this signal, and this modulation is used for the appearance of identification label.In addition, United States Patent (USP) 5515053 discloses a kind of radio-frequency (RF) identification communication system, and wherein the reader emission comprises whole digital asterisk wildcard ground coded signal.If receive a plurality of signals, reader is just launched another coded signal, but has reduced asterisk wildcard in coding.Repeat this process up to receiving only a signal.These two kinds of methods all have the weak point identical with the binary tree searching method.
Dynamic minute frame slot Aloha method in the ISO18000-6 standard is that N time slot formed a time frame, makes all labels will select a time slot to transmit Sequence Number to reader in each time frame at random.Reader sends silent signal behind the sequence number that successfully receives a label no longer transmit Sequence Number this label.Reader through a recognition cycle after, according in reading for the number of identification label redefines a timeslot number in the time frame, carry out the identification of next recognition cycle.Because this method is that a kind of uncertain method and throughput ratio are lower, when a large amount of labels passed through to read the field fast, reader may be missed some label and they do not identified, and causes the imperfect of data.So the present invention is devoted to study a kind of method, make it can improve the performance of the anticollision of discerning a plurality of labels simultaneously.
Summary of the invention
The present invention relates to a kind of system and method that reads the anticollision of a plurality of labels simultaneously.According to various aspects of the present invention, this radio-frequency recognition system comprises one or more readers and several labels.
Wherein reader comprises that the data communication control module is with the interface and the power supply of data processing equipment in order to one group of antenna of emission wireless signal.Antenna sets is used for sending and receives wireless signal and label communicates; The data communication control module is used for controlling the flow process of communication, for example controls reader and sends synchronization frame and various control signals etc. when; Comprise serial ports of computers (RS232) and network interface (TCP/IP) with the interface of data processing equipment, the data that are used for receiving are sent to data processing equipment.In addition, each label comprises a storer and radio communication device.The storer the inside has stored the pre-assigned sequence number of fixed data bit length and a state of label of comprising; Radio communication device mainly comprises antenna and communication control module, is used for receiving and transmission wireless signal and reader swap data.Some label (active tag) also comprises battery and is used for powering, and other labels (passive label) are powered by the antenna in the radio communication device.
Postpone big and the little problem of handling capacity in the prior art in order to solve, the present invention is achieved by the following technical solutions, the steps include:
A) the reader circulation sends interrogating signal and checks to read whether have Unidentified label to exist in the field, all receive the unidentified tag responses of interrogating signal this semaphore request; Send answer signal to reader after the label of a firm reading range that enters reader (read) is received interrogating signal, and with the state of label from close become ready;
B) after reader receives the answer signal that label sends, the size of transmitting time frame (number of the mini-slot that comprises in the frame) is given all labels, label is according to the time frame size that receives, each is random number of middle selection in this scope, and the order of arranging each its shared mini-slot according to this random number, afterwards, all labels wait for that reader sends synchronization frame;
C) reader sends a synchronization frame to all labels, and label sends a random number to reader on the mini-slot of oneself selecting at random after receiving synchronization frame;
D) reader is inquired about the situation of reading of data on different mini-slot successively, on time slot corresponding, skips time slot idle and that bump, receives the sequence number of label on can the time slot of normal transmission data;
E) reader was after inquiring about all mini-slot successively, situation according to reading of data on different mini-slot and time slot, calculate the size (recognition cycle be meant the reader transmitting time frame from step b) the identifying of size till), of the time frame of next recognition cycle here to the size that calculates new time frame in all mark attendance book steps;
F) identifying enters next recognition cycle, repeating step b) to step e), the sequence number of all labels is read in reading the field.
The situation one of reading of data has three kinds on the time slot of mentioning in the top step: this time slot free time, promptly do not have label to transmit random number in the mini-slot of correspondence; This time slot normal transmission promptly only has a label to transmit random number in the mini-slot of correspondence; This slot transmission bumps, and promptly has the label more than to transmit random number in the mini-slot of correspondence.Reader can be judged the situation of reading of data on the corresponding time slot by the situation of reading of data on the different mini-slot.
The present invention has overcome deficiency of the prior art, and a kind of method of utilizing mini-slot to preengage corresponding sending time slots in advance is provided.One of them time frame has comprised some mini-slot and some time slots, and mini-slot is by different time quantum respective delays with respect to synchronization frame with time slot.The two does not overlap in time mutually, is one to one on logical relation.Mini-slot is in the front portion of time frame, and it is used for transmitting the time slot that a random number is used to preengage needs transmission data; Time slot is in the rear portion of time frame, is used for transmitting the sequence number of label.Because the random number required time that transmission is used to preengage is less, we will be called mini-slot during this period of time.This this method of preengaging in advance comprises following content:
Label is not the sequence number that sends its pre-assigned fixed data bit length immediately on selected time slot after receiving the synchronization frame that reader sends, but sends a random number on the corresponding mini-slot of selecting.The mini-slot in time frame and the total quantity of time slot equate, selected mini-slot and time slot are one to one always in a recognition cycle, promptly in same recognition cycle, label sends random number and carries out the reservation of sending time slots on i mini-slot, if preengage successfully, the sequence number that then will send oneself on i time slot of correspondence is to reader.The random number that sends on mini-slot is used for distinguishing different labels, and reader is by receiving the situation that the random number that sends on the mini-slot detects reading of data on the time slot corresponding of back:
If a) reader is found idle on mini-slot or collision, promptly on mini-slot, do not receive data or receive the different random number that a plurality of labels send, reader sends end signal to all labels on the time slot corresponding in the back so, finish this time slot in advance, make identifying enter next time slot.
B) if reader receives the data that do not bump on mini-slot, promptly on mini-slot, only receive a random number, reader will be in the back receives the sequence number that label sends on the time slot corresponding so, and the correctness and the integrality of checking sequence number.If check is errorless, then send a silent signal to this label, make it change dormant state over to, make in its recognition cycle afterwards and no longer send signal, reader sends end signal to all labels afterwards; If find that through the check reader sequence number that receives is wrong, then directly send end signal to all labels, finish this time slot in advance, make identifying enter next time slot.The length of the sequence number that label should send on time slot much smaller than label in the length of the random number that sends on the mini-slot just can reduce system delay by the corresponding sending time slots of mini-slot reservation like this.
According to an aspect of the present invention, provide a kind of method of tag state conversion, had two data bit to be used for writing down its state in the storer of label.State is not for closing when reading entering for label, and state value is 00, represents that promptly label can not send signal, can't and reader communication.After entering the reading field, state becomes ready, represents that with 01 at this moment label waits for that receiving the reader control signal also is ready for sending data.After receiving a synchronization frame, label changes transmit status over to, and it will transmit Sequence Number to reader on selected time slot, and this moment, state value was 10.After the data that reader receives by verification also can be determined to receive successfully, before finishing, this time slot sends silent signal to respective labels, its state value is changed to 11, make this label change dormant state over to.Successfully discerned owing to be in the label of dormant state, need not to transmit Sequence Number again, therefore,, also can not send the sequence number of oneself even label still is in the reading field in next recognition cycle to reader by reader.In the starting stage of each recognition cycle, label all need check earlier whether the state value of oneself is 10 after receiving the synchronization frame that reader sends, and the label that only is in transmit status could send the sequence number of oneself on selected time slot.
A kind of method of dynamic setting-up time frame sign is provided according to a further aspect in the invention.The size of time frame is meant the mini-slot in the recognition cycle or the total quantity of time slot.Along with the carrying out of identifying, read a number of interior unidentified label and reduce gradually, for the recognition performance reader that guarantees system will come dynamic setting-up time frame sign according to the number of unidentified label.Reader is in the unpredictable number of reading unidentified label in the field of first recognition cycle, and therefore in first recognition cycle, reader sends a predefined time frame size to all labels.After first recognition cycle, reader calculates the time frame size of next recognition cycle by the situation of reading of data on mini-slot and the time slot.Each later recognition cycle is all calculated the size of time frame in this cycle according to the situation of last one-period reading of data.
Description of drawings
Fig. 1 is for reading the collision avoidance system composition frame chart of a plurality of labels according to an embodiment of the invention simultaneously;
Fig. 2 shows the flow process of the example operation of the collision-proof method of discerning a plurality of labels simultaneously;
Fig. 3 is the state transition graph of the label that successfully transmits Sequence Number;
Fig. 4 illustrates according to an embodiment of the invention mini-slot and the composition of time slot and the corresponding relation between them in first recognition cycle, the number of the random number that the numeral among the figure in the mini-slot square frame receives, si in the time slot square frame represents i time slot, arrow among the figure has been represented the logic corresponding relation of mini-slot and time slot, promptly transmits the mini-slot reservation of the time slot of data by its arrow points.
Embodiment
As shown in Figure 1, radio frequency identification system 1 has comprised reader 2 and 8 labels 3
1To 3
8, wherein reader 2 comprises one group of antenna 20 again, data communication control module 21 is with the interface 22 and the power supply 23 of data processing equipment; Label 3
1To 3
8 Comprise storer 30 and radio communication device 31 (antenna 310 and communication control module 311) again, label 3
1To 3
8Also may comprise the battery (not shown).
The antenna sets 20 of the reader 2 shown in Fig. 1 and label 3
1To 3
8 Antenna 310 between set up the link of less radio-frequency.Distance between this link can have the type (active or passive type) of label and the parameters such as emissive power of reader 2 to determine.For feasibility of the present invention is described, here shown in distance between label and the reader 2 in 1 meter.
As shown in Figure 2, reader 2 comes identification label through initialization (401) back according to following steps:
A) reader 2 circulations send interrogating signal (402) and check to read in the field whether unidentified label is arranged, label 3
1To 3
8The tag state value that stores in its storer 30 when not entering the reading field is 00, represents that its state is for closing 90 (see figure 2)s, label 3 after entering the interrogating signal of reading the field and receiving reader 2 transmissions
1To 3
8Send answer signal to reader 2, label 3
1To 3
8Send the tag state value that stores in the storer 30 behind the answer signal and be set to 01, make its state become ready 91;
C) reader 2 sends a synchronization frame (403) and gives label 3
1To 3
8, label 3
1To 3
8Tag state value with storage in its storer 30 after receiving synchronization frame is 10, represents that its state becomes transmission.After state changes, label 3
1To 3
8Send a random number (404) on own selected mini-slot, wherein k mini-slot is k the delay (random number that each label sent sees also table 1) with respect to synchronization frame;
D) only have a label to send random number as can be seen from Table 1 on the 1st, 4,6 and 8 mini-slot, they are respectively labels 3
2, 3
7, 3
1With 3
4, therefore reader 2 is only received a random number on these mini-slot, in addition, two labels 3 is arranged on the 3rd mini-slot
3With 3
6Send same random number to reader 2, therefore reader 2 is also only received a random number 01 on this mini-slot, so reader 2 thinks that the data read situation of these five mini-slot all is normal transmission (405), with the pre-sequence number (406) that on these five mini-slot time slot corresponding, receives the respective labels transmission.It can also be seen that from table 1 at the 2nd and 5 mini-slot does not have label to send data, and promptly the data read situation of this mini-slot is idle (405).And two labels 3 are arranged on the 7th mini-slot
5With 3
8Send different random number 11 and 10 to reader 2, transmission collision (405) therefore takes place on this mini-slot, just illustrated that also reader 2 does not receive correct data on the 7th time slot of correspondence.So when reader 2 is inquired about the situation of the reading of data of the corresponding mini-slot of different time-gap successively in identifying, and when finding above two kinds of time slots, reader 2 can directly send end signal (409) to label 3
1To 3
8, finish this time slot in advance, make identifying enter next time slot.Wherein the composition of mini-slot in this recognition cycle and time slot and the corresponding relation between them are as shown in Figure 3.
Table 1: the parameter list of each label for example when first recognition cycle began
| Label | Selected mini-slot number | Selected random | Tag state | |
| 3 1 | 6 | 00 | 10 | |
| 3 2 | 1 | 10 | 10 | |
| 3 3 | 3 | 01 | 10 | |
| 3 4 | 8 | 00 | 10 | |
| 3 5 | 7 | 11 | 10 | |
| 3 6 | 3 | 01 | 10 | |
| 3 7 | 4 | 11 | 10 | |
| 3 8 | 7 | 10 | 10 |
E) reader shown in Fig. 32 receives the sequence number that each label sends on the 1st, 3,4,6 and 8 time slots, and the correctness (407) of the institute of verification after reception receive sequence number.Label 3
2, 3
7, 3
1With 3
4The sequence number that sends is after verification is errorless, and reader 2 sends silent signal (408) and gives label 3
2, 3
7, 3
1With 3
4, receive the label 3 of silent signal
2, 3
7, 3
1With 3
4The tag state value that stores in its storer 30 is set to 11, even their state transfers dormancy 93 (see figure 3)s to, after this reader 2 sends end signal (409) again and gives label 3
1To 3
8, finish the data transmission of this time slot, make identifying enter next time slot; And two labels 3 that on the 3rd time slot, receive
3With 3
6The sequence number that sends is found mistake through reader 2 verifications, and reader 2 can directly send end signal (409) and give label 3
1To 3
8, finish the data transmission of this time slot, make identifying enter next time slot.
F) reader 2 is after finishing first recognition cycle (410), and reservation process on the process mini-slot and the Data Receiving on the time slot and checking procedure find successfully to have discerned 4 labels 3
2, 3
7, 3
1With 3
4, simultaneously also found to have on the mini-slot and time slot on data transmission collision has taken place.Here estimate the size (411) of next time frame with rough method, the mini-slot of the generation data collision that its size is a twice and the number sum of time slot, promptly the size of next time frame is 4.
G) in second recognition cycle, the estimated value 4 of reader 2 transmitting time frame signs (403) is given all labels, label 3
3, 3
5, 3
6With 3
8Therefrom select a mini-slot separately randomly according to the time frame size that receives, at this moment label 3
1, 3
2, 3
4With 3
7State value be 11, represent that promptly they are in dormant state, (the selected mini-slot of each label sees also table 2, and x represents non-selected sending time slots number in the table will not select time slot and random number, xx represents non-selected random number), and wait for the synchronization frame that reader 2 sends;
H) this step identifying is similar to step c), receive the synchronization frame that reader 2 sends after, label 3
3, 3
5, 3
6With 3
8Sending random number (404, the selected random number of each label sees also table 2) on the selected mini-slot separately;
Table 2: the parameter list of each label for example when second recognition cycle began
| Label | Microgap number when selected | Selected random number | The tag state value |
| 3 1 | x | xx | 11 |
| 3 2 | x | xx | 11 |
| 3 3 | 2 | 01 | 10 |
| 3 4 | x | xx | 11 |
| 3 5 | 3 | 11 | 10 |
| 3 6 | 2 | 10 | 10 |
| 3 7 | x | xx | 11 |
| 3 8 | 1 | 10 | 10 |
I) this step identifying is similar to step d), and reader 2 finds that according to the random number that receives the data read situation on the 1st and 3 mini-slot is normal transmission (405) on mini-slot; Data read situation on the 2nd mini-slot is collision (405), and the data read situation on the 4th mini-slot is idle (405).Therefore reader 2 is incited somebody to action receive sequence number on the 1st and 3 time slots in advance, and finishes the 2nd and 4 time slots in advance by sending end signal (409).
J) this step identifying is similar to step e), has read to reader 2 process verification succeeds label 3
5With 3
8Sequence number (406,407) after, send silent signal (408) and give this two labels.Receive the label 3 of silent signal
5With 3
8Transfer the state of oneself to dormancy 93 (see figure 3)s.
K) this step identifying is similar to step f), and after finishing second recognition cycle, reader 2 finds successfully to have discerned 2 labels 3
5With 3
8, simultaneously also found to have a data transmission on the mini-slot that collision has taken place, and the size (411) that estimates next time frame is 2.
L) in the 3rd recognition cycle, the estimated value 2 of reader 2 transmitting time frame signs (403) is given all labels, label 3
3With 3
6Therefrom select a mini-slot separately randomly according to the time frame size that receives, at this moment label 3
1, 3
2, 3
4, 3
5, 3
7With 3
8All be in dormant state, will do not select time slot and random number (the selected mini-slot of each label sees also table 3, and x represents non-selected sending time slots number in the table, and xx represents non-selected random number), and wait for the synchronization frame that reader 2 sends;
Table 3: the parameter list of each label for example when the 3rd recognition cycle began
| Label | Microgap number when selected | Selected random number | The tag state value |
| 3 1 | x | xx | 11 |
| 3 2 | x | xx | 11 |
| 3 3 | 1 | 11 | 10 |
| 3 4 | x | xx | 11 |
| 3 5 | x | xx | 11 |
| 3 6 | 2 | 01 | 10 |
| 3 7 | x | xx | 11 |
| 3 8 | x | xx | 11 |
M) this step identifying is similar to step c), d) and e), reader 2 is by the Data Receiving (406) on the reservation on the mini-slot (404), the time slot with to the verification (407) of data, successful reception label 3
3With 3
6Sequence number, and send silent signal (408) and give this two labels, the state-transition that makes them is dormancy.
N) after finishing the 3rd recognition cycle, reader 2 finds successfully to have discerned again 2 labels 3
3With 3
6, and and collisionless generation.Therefore, the size (411) with next time frame is set to 1.
O) in the 4th recognition cycle, the value 1 of reader 2 transmitting time frame signs (403) is given all labels, at this moment, and all labels 3
1To 3
8All be in dormant state, do not have label on mini-slot, to send random number (404).
P) reader 2 is thought to read in the field does not have Unidentified label, resends interrogating signal (402) and checks to read in the field whether unidentified label is arranged.
It more than is the complete identifying of one embodiment of the invention.In addition, when label 3
1To 3
8After moving out the reading field, the tag state value that stores in its storer 30 is with zero clearing (00), label 3
1To 3
8To revert back closed condition automatically.
Above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field should be appreciated that still and can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of the bright technical scheme of this book box, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (10)
1. system that reads the anticollision of a plurality of labels simultaneously, this system has comprised one or more readers and a plurality of label, wherein reader can be by the data of wireless mode reading tag stored, and can the data that read be sent to data processing equipment by wired mode; And described label has been allocated in advance a sequence number, and label can send to reader with sequence number by wireless mode.
2. the system as claimed in claim 1, reader wherein comprise that the data communication control module is with the interface and the power supply of data processing equipment in order to one group of antenna of emission wireless signal.
3. the system as claimed in claim 1, label wherein has been assigned with a unique sequence number and has been used for distinguishing with other labels, and this sequence number is predetermined and has the figure place of predetermined fixed; Label described in the claim 1 comprises the device that is used for storing the storer of sequence number and sends its sequence number by wireless mode.
4. a method that reads the anticollision of a plurality of labels simultaneously is characterized in that, may further comprise the steps:
A) the reader circulation sends interrogating signal and checks to read whether have unidentified label to exist in the field, all receive the unidentified tag responses of interrogating signal this semaphore request, the label after replying enters ready state;
B) after reader receives the answer signal that label sends, the size of transmitting time frame (number of the mini-slot that comprises in the frame) is given all labels, label is selected a mini-slot separately randomly according to the time frame size that receives, and waits for the synchronization frame that reader sends;
C) reader sends a synchronization frame to all labels, and label sends a random number to reader on own selected mini-slot after receiving synchronization frame;
D) reader is according to the situation of reading of data on different mini-slot, receives the sequence number of label successively on can the time slot of normal transmission data;
E) reader is according to the situation of reading of data on different mini-slot and time slot, calculate the size (recognition cycle be meant the reader transmitting time frame from step b) the identifying of size till), of the time frame of next recognition cycle here to the size that calculates new time frame in all mark attendance book steps;
F) identifying enters next recognition cycle, repeating step b) to step e), be read up to the sequence number of all labels.
5. method as claimed in claim 5 is characterized in that, label comprise altogether close, ready, transmission and dormancy one of four states.Wherein closed condition represents that label does not enter the reading field and can not send signal, ready state represents that label has entered the reading field and has been ready for sending signal, transmit status represents that label is sending signal in reading the field, though and dormant state represents that label does not respond the signal of reader in reading the field.
6. method as claimed in claim 5 is characterized in that, one of them time frame has comprised some mini-slot and some time slots, and mini-slot is by different time quantum respective delays with respect to synchronization frame with time slot.The two does not overlap in time mutually, is one to one on logical relation.Mini-slot is in the front portion of time frame, and it is used for transmitting the time slot that a random number is used to preengage needs transmission data; Time slot is in the rear portion of time frame, is used for transmitting the sequence number of label.
7. method as claimed in claim 5 is characterized in that, reader wherein can finish a time slot in advance by sending end signal, thereby is transformed into next time slot.
8. method as claimed in claim 5 is characterized in that, reader wherein can be judged the situation of reading of data on the corresponding time slot by the situation of reading of data on the different mini-slot.The situation one of reading of data has three kinds on the time slot: this time slot free time, both do not had label to transmit random number in the mini-slot of correspondence; This time slot normal transmission had both only had a label to transmit random number in the mini-slot of correspondence; This slot transmission bumps, and existing label more than transmits random number in the mini-slot of correspondence.
9. method as claimed in claim 5, it is characterized in that, further may further comprise the steps, reader is wherein inquired about the situation of the reading of data of the corresponding mini-slot of different time-gap successively, up to find can the normal transmission data time slot the time, the sequence number of reading tag on this time slot, whether the reader tag serial number that verification receives after reading of data is correct, if it is errorless to have verified that sequence number receives, just send silent signal to corresponding label, make its recognition cycle afterwards no longer respond the signal that reader sends, withdraw from up to label and read the field; If it is wrong to have verified that sequence number receives, reader sends end signal to all labels, finishes this time slot in advance, makes identifying enter next time slot.
10. method as claimed in claim 5, it is characterized in that, further may further comprise the steps, reader is wherein inquired about the situation of the reading of data of the corresponding mini-slot of different time-gap successively, when finding the time slot that idle time slot or transmission bump, reader directly sends end signal to all labels, finishes this time slot in advance, makes identifying enter next time slot.
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| CN101866413A (en) * | 2010-06-11 | 2010-10-20 | 南京邮电大学 | Multi-label anti-collision method based on grouping mechanism and jumping dynamic binary recognition |
| CN101533457B (en) * | 2008-03-11 | 2011-06-15 | 北京大学 | Method for code division reservation and space division reading of active radio frequency tag |
| CN101551845B (en) * | 2008-03-31 | 2011-07-20 | 华为技术有限公司 | Identification and response method for electronic label, device and system |
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| CN105095807A (en) * | 2014-05-22 | 2015-11-25 | 北京邮电大学 | Radio frequency identification sensor network anti-collision system and algorithm based on inter-card communication mechanism |
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| CN108804960A (en) * | 2017-05-03 | 2018-11-13 | 九齐科技股份有限公司 | Radio frequency transmission method and device |
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| CN108563884A (en) * | 2018-04-20 | 2018-09-21 | 南京航空航天大学 | A kind of most value method of estimation towards extensive RFID system |
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