CN101281587A - Radio frequency recognition reading method and answering method - Google Patents
Radio frequency recognition reading method and answering method Download PDFInfo
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- CN101281587A CN101281587A CNA2007101453649A CN200710145364A CN101281587A CN 101281587 A CN101281587 A CN 101281587A CN A2007101453649 A CNA2007101453649 A CN A2007101453649A CN 200710145364 A CN200710145364 A CN 200710145364A CN 101281587 A CN101281587 A CN 101281587A
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Abstract
The invention relates to a radio frequency identification reading method and responding method, especially suitable for advancing the anticollision performance of the radio frequency identification technique, wherein the reading method includes: transmitting the inquiry order including the orthotropic cycle code; generating a group of orthotropic de-spread code to de-spread the received answering signal to obtain the answering mark; transmitting the affirming order; transmitting the re-inquiry or inquiry adjusting order and going on receiving the answering signal. The answering method includes: receiving the inquiry order including the orthotropic cycle code; de-spreading and modulating the answering marks to generate the answering signals according to the orthotropic cycle code to generate the orthotropic spread spectrum code; transmitting the answering signal; waiting for receiving the acknowledge order to enter the acknowledge state or receiving the inquiry adjustment order to execute the next identifying step. The invention adopts the method combining the code division and time division, recognizes a plurality of answering signals at the same time slot, and effectively prevents the collision interference, reduces the recognizing answer time consumption, realizes the safe, reliable and high efficient radio frequency identification.
Description
Technical field
The present invention relates to a kind of radio frequency recognition reading method and answer method, be particularly useful for a kind of radio frequency recognition reading method and answer method that can improve REID anticollision performance.
Background technology
Radio-frequency (RF) identification (Radio Frequency Identification is hereinafter to be referred as RFID) technology is a kind of radio backscatter transmission of utilizing, and realizes the technology of the contactless automatic identification (Auto-ID) of object.In recent years, in many business fields, use widely as having obtained in the systems such as production run management, supply chain management, logistics and transportation, distribution, retail, communications and transportation control.Under this development trend, the target of RFID technology is the data volume that the expansion transponder provides, and the information about individual, animal, object and goods is provided widely.
Rfid system is made up of transponder and two basic devices of reader usually.Transponder is the data carrier in the rfid system, reader sends the radiofrequency signal of certain frequency by emitting antenna, when transponder enters the emitting antenna perform region, obtain energy and activate, information such as self coding are sent to reader by backscattered radio signal, after reader carries out the demodulation sign indicating number to received signal, data such as responder coding are carried out exchanges data by interface and control computer, carry out the order of sending simultaneously, realize the application corresponding function from application systems software.
Reader is carrying out in the radio frequency identification process transponder, when many transponders are arranged in the radiation field of aerial of reader, can bump between the transponder, and when promptly a plurality of transponders sent signal simultaneously, the meeting contention channel can interfere with each other between the signal.The concrete manifestation form of this situation in warehouse import and export statistics system is: a plurality of commodity that have sign are inquired about simultaneously by same reader.Solve this class collision problem and relate to the anticollision technology, the quality of anticollision technical design will influence the performance of radio-frequency recognition system to a great extent.The method that solves the anticollision problem in the prior art adopts tree search and collision random back technology to realize usually.When the number of the transponder that reads at needs was big, these technology response times were longer relatively, and real-time is relatively poor.Under and time for reading condition of limited very big at the number of article, the simple RFID collision-proof method of tree search or collision random back technology that adopts just can not meet the demands.On the other hand, along with deepening continuously that RFID uses, the information of carrying in the transponder also can get more and more, and the data traffic between reader and the transponder is also increasing, and information security requires also more and more higher.Therefore, need a kind of high-level efficiency, quick identification and the good RFID anticollision technology of Information Security.
Summary of the invention
The objective of the invention is to overcome defective of the prior art, a kind of radio frequency recognition reading method and recognition methods are provided, in radio frequency identification process, effectively avoid collision to disturb, and realize high efficiency rapid identification.
For achieving the above object, provide a kind of radio frequency recognition reading method, comprised the steps:
Step 1, be that the quadrature cycle sign indicating number of M is arranged in the parameter of querying command as current quadrature cycle sign indicating number with code length, determine shift value N according to code length M, this shift value N is the nonnegative integer less than this code length M, and sends this querying command; Wherein, M is a positive integer;
Step 2, produce the orthogonal dispreading sign indicating number according to current quadrature cycle sign indicating number and shift value N;
Step 3, utilize this orthogonal dispreading sign indicating number that one or more answer signal despreadings that received are handled, obtain replying sign;
Step 4, send and to comprise this and reply the sign order of accepting one's fate really;
Step 5, judge whether present frame finishes, if then execution in step 6;
Order is adjusted in step 6, transmission inquiry, carries out the identification of next frame.
Reader is by carrying out above-mentioned steps, send the frame length parameter of quadrature cycle sign indicating number and present frame to transponder, can in same time slot, receive a plurality of answer signals, and identify a plurality of transponders that do not bump simultaneously, after the transponder of having confirmed to have discerned, utilize inquiry to adjust the identification that order starts next frame, in previous frame in response to answering that signal bumps and unidentified to transponder discern once more, effectively solved the problem of signal collision.
This realization above-mentioned purpose also provides a kind of rfid-transponder method, comprises the steps:
Step 1 ', receive and to comprise the querying command that code length is the quadrature cycle sign indicating number of M; Wherein, M is a positive integer;
Step 2 ', produce orthogonal intersection according to the quadrature cycle sign indicating number, adopt orthogonal intersection to carry out band spectrum modulation to replying sign, produce answer signal;
Step 3 ', send this answer signal;
Step 4 ', judge whether to receive the confirmation order, if, then enter the affirmation state, otherwise execution in step 5 ';
Step 5 ', judge whether to receive inquiry and adjust order, if then carry out the identification of next frame.
Transponder is by carrying out above-mentioned steps, the quadrature cycle sign indicating number ring shift that reader is sent generates spreading code, the sign of replying to self is carried out spread spectrum, if do not receive the affirmation order, then enter the wait arbitrate state after sending, wait for the order that starts next time slot inquiry, if transponder sends answer signal and does not receive the confirmation order, then may be not identified by reader because bump, then transponder waits for that receiving inquiry adjusts order, starts the identification of next frame.
By above technical scheme as can be known, the present invention adopts sign indicating number to divide the technological means that combines with the time-division, realizes the collision-proof method of rfid system high-level efficiency, quick identification.The hardware complexity of this method and cost expense are in the scope of permission, but the anticollision performance improves greatly, simultaneously, time-division and sign indicating number branch advantage have separately been utilized, the utilization factor height of spreading code, strong anti-interference performance has advantages such as certain confidentiality and anti-multipath interference performance, has overcome long technical matters of REID collision-proof method response time.
Therefore, the present invention has the following advantages:
1, realized the parallel identification of a plurality of RFID radio-frequency identification transponders, reduced recognition time, can realize the quick identification of a large amount of RFID transponders than simple collision-proof method based on " time slot A LOHA " frame.
2, in same time slot, adopt the code division multiplexing mode, can identify a plurality of answer signals simultaneously, and have strong interference immunity, the signal to noise ratio (S/N ratio) height, confidentiality is better, the advantage that the anti-multipath interference performance is strong.
3, owing to adopted the self-loopa orthogonality principle of quadrature cycle sign indicating number to produce frequency expansion sequence, make the manufacturing cost of transponder and arrangement for reading be in the allowed band, and be convenient to adopt the chip technology of domestic and international main flow to realize.
Also in conjunction with the accompanying drawings the present invention is described in further detail below by specific embodiment.
Description of drawings
Figure 1A is depicted as the structural representation of the reader of carrying out radio frequency recognition reading method specific embodiment one of the present invention.
Figure 1B is depicted as the structural representation of the transponder of carrying out rfid-transponder method specific embodiment one of the present invention.
Fig. 2 is the process flow diagram of radio frequency recognition reading method specific embodiment one of the present invention.
Fig. 3 is the part process flow diagram of radio frequency recognition reading method specific embodiment two of the present invention.
Fig. 4 is the process flow diagram of rfid-transponder method specific embodiment one of the present invention.
Embodiment
Basic thought of the present invention is: all transponders receive from the quadrature cycle sign indicating number with certain-length of reader transmission and the frame length parameter of present frame, each transponder according to this quadrature cycle sign indicating number at random phase shift obtain oneself orthogonal intersection, and produce the frame slot parameter of oneself according to the frame length stochastic parameter of this present frame.The length of this quadrature cycle sign indicating number is controlled according to transponder quantity survey situation in the radio-frequency field by reader, thereby has both guaranteed the collision recognition of every frame, has reduced the consuming time of identification response again.Transponder carries out modulation systems such as two-phase keying or amplitude keying and carries out reflection modulation when transmitting data at the ultra-high frequency signal for reader, adopt the orthogonal intersection sequence of each self-generating that the data that transponder need send are modulated transmission.Reader is when reading identification, the quadrature cycle sign indicating number sequence that local all phase shifts of generation obtain, behind the answer signal that receives the transponder transmission, utilize good autocorrelation of quadrature cycle sign indicating number sequence and simple crosscorrelation performance to carry out despreading and handle, and transponder is carried out radio-frequency (RF) identification according to the despreading result.Radio frequency recognition reading method of the present invention and answer method are based on all that radio-frequency recognition system that employing " time slot A LOHA " frame inserts realizes, " time slot A LOHA " agreement regulation, channel is pressed time slot and is divided, each time slot just in time transmits a grouping, after packet arrives, must wait until that next time slot just begins to transmit, in a single day bumping between grouping to be hundred-percent overlapping, transponder is before sending answer signal, at first can generate a frame slot parameter according to the frame length stochastic parameter of present frame, when the frame slot parameter equals zero, send answer signal, if the frame slot parameter is not equal to zero, then wait for the querying command again that reader sends, receive again after the querying command, the frame slot parameter is subtracted 1, send answer signal again when the frame slot parameter is zero, promptly transponder can send answer signal in certain time slot of present frame.Usually comprise the frame length parameter in the parameter that above-mentioned querying command and inquiry adjustment are ordered, promptly will start the frame length parameter of the frame of inquiry, can be fixed value, also can reset as the case may be.Describe radio frequency recognition reading method of the present invention and answer method in detail below by specific embodiment.
Be illustrated in figure 2 as the process flow diagram of radio frequency recognition reading method specific embodiment one of the present invention, the structural representation of reader is shown in Figure 1A among the embodiment one, and the radio frequency recognition reading method of embodiment one specifically comprises the steps:
(to call AdjustQuery in the following text) order is adjusted in step 160, transmission inquiry, carries out the identification of next frame.
The radio frequency recognition reading method that reader adopted among the embodiment one, promptly reader duty mechanism is a round-robin process.
In the above-mentioned steps 110, include the frame length parameter of present frame and the quadrature cycle sign indicating number that code length is M in the parameter of this Query order.This quadrature cycle sign indicating number can be a pre-set quadrature cycle sign indicating number, is applicable to the less situation of number of transponders that is present in simultaneously in the radio-frequency field.Its preferred another kind of embodiment is pre-set one group of quadrature cycle sign indicating number, be stored in the reader as quadrature cycle sign indicating number collection, before above-mentioned steps 110, also comprise the step of reader at the concentrated selected quadrature cycle sign indicating number of quadrature cycle sign indicating number, it is bigger that this embodiment is adapted in the radio-frequency field number of transponders, needs to change the situation of quadrature cycle sign indicating number.The code length of above-mentioned quadrature cycle sign indicating number is M, and the span of M can be 8 to 128, can select the quadrature cycle sign indicating number of different code length, so organize the not quadrature cycle sign indicating number of isotopic number concentrated should comprising at reader quadrature cycle sign indicating number more.Carrying out the radio-frequency (RF) identification first time, when being unable to estimate in the radio-frequency field number of transponders, can at first set an initial value, as in the present embodiment M value being set at 32, reader is included in this M position quadrature cycle sign indicating number in the parameter of reader Query order and sends, to start the radio-frequency (RF) identification of taking turns.The frame length parameter of the present frame that is comprised in the Query order represents that with L the span of L is 2 K power, and the span of K is 4 to 9 usually, and present frame frame length initial value design is 64 in the present embodiment.The shift value N that determines in step 110 is the nonnegative integer less than code length M, and the initial value default setting is M-1.
In the above-mentioned steps 120, the step that produces the orthogonal dispreading sign indicating number according to quadrature cycle sign indicating number and shift value N is specially: the quadrature cycle sign indicating number of M position is carried out ring shift N+1 time, produce N+1 orthogonal dispreading sign indicating number.
In the above-mentioned steps 130, if reader does not receive new answer signal, illustrating does not have Unidentified transponder in the radio-frequency (RF) identification scope, then should read flow process and finish, and waits for that entering next radio-frequency (RF) identification reads flow process.Received Unidentified answer signal if exist, then at first carried out necessary processing, as the step of carrier wave demodulation, this is those skilled in the art's a common practise, repeats no more.This Unidentified answer signal can receive before producing orthogonal intersection, also can receive thereafter, then answer signal is carried out despreading and handle, the embodiment that despreading is handled is: adopt N+1 orthogonal dispreading sign indicating number that the answer signal despreading is handled, obtain the despreading result; The result carries out data decode to this despreading, obtains replying sign.
At this moment, if do not bump, promptly there are not two or more transponders to produce same quadrature cycle spreading code, and in same time slot, send to use the answer signal of same spreading code band spectrum modulation, reader just can be discerned the identification data of replying of all transponders, if collision has taken place, promptly there are two or more transponders to produce same quadrature cycle spreading code, and in same time slot, sent the answer signal of band spectrum modulation, then owing to quadrature cycle sign indicating number good autocorrelation and cross correlation, reader still can identify the identification data of other all transponders that do not bump.The above-mentioned step of data decode that the despreading result is carried out is for identifying the performed demodulation step of other data-modulated of carrying out, for example Miller (to call miller in the following text) data demodulates to replying.What obtain replys sign, is the ID data of transponder.
In step 140, reader sends the Ack order one by one for all transponders of having discerned, comprises the identification data of replying of responding transponder in the Ack order.
In the above-described embodiments, after identifying transponder and confirming, reader is execution in step 1450 further, promptly obtains the application data of the corresponding orthogonal intersection band spectrum modulation that adopts answer signal.Can realize above-mentioned steps 1450 by following steps:
Step 1450a, reader transmission do not comprise read (to call Read in the following text) of replying sign orders;
Step 1450b, reader obtain the application data of the corresponding orthogonal intersection band spectrum modulation that adopts answer signal.
The identification data of replying that can not comprise given transponder in the Read command parameter that reader sends, be used to read the application data that all are in the transponder of affirmation state, this situation is called parallel reading, the identification data of replying that also can comprise given transponder in the Read command parameter, be used for reading this moment and be in the affirmation state and reply the application data of the transponder that identification data conforms to the Read command parameter, reader changes replying identification data and just can read different transponder data one by one in the parameter, and this situation is called serial and reads.Transponder is after receiving reading order, and the spreading code application data that is adopted when all adopting the front transmission to reply sign is carried out band spectrum modulation and then sent to reader.Then reader can adopt the extended code application data of separating that has produced to carry out despreading, and carries out follow-up processing, perhaps sends to corresponding calculated machine or control device.
Finished after the recognition and verification of a time slot, in step 150, reader judges whether present frame finishes, if do not finish, then send inquiry (to call ReQuery in the following text) order again, and execution in step 130, unidentified to transponder in next time slot, proceed identification; If present frame finishes, bump and the unidentified transponder that arrives but also exist in response to answering signal, reader then sends the AdjustQuery order of the frame length parameter that comprises next frame, and execution in step 160, enter the identification of next frame, be the frame length parameter delta frame minislot parameter of transponder according to next frame, this frame length parameter can be constant, it also can be the frame length parameter of upgrading, the data that then repeat in the frame send, continue execution in step 130, reader can be received in the answer signal that the transponder that bumps in the previous frame sends once more, has all discerned up to all transponders.
Above-mentioned radio frequency recognition reading method embodiment one is based on time-division and yard reading method that the branch technology combines, by adopting the prototype sign indicating number of the good quadrature cycle sign indicating number of autocorrelation performance and simple crosscorrelation performance as band spectrum modulation, can realize the parallel identification of a plurality of RFID transponders in the time slot, reduced recognition time than simple collision-proof method based on " time slot A LOHA " frame, can realize the quick identification of a large amount of RFID transponders, in same time slot, adopt the code division multiplexing mode, has strong interference immunity, the signal to noise ratio (S/N ratio) height, confidentiality is better, the advantage that the anti-multipath interference performance is strong, owing to adopted the self-loopa orthogonality principle of quadrature cycle sign indicating number to produce frequency expansion sequence, make the manufacturing cost of arrangement for reading be in the allowed band, be convenient to adopt the chip technology of domestic and international main flow to realize.
Be illustrated in figure 3 as the part process flow diagram of radio frequency recognition reading method specific embodiment two of the present invention, specifically comprise the steps:
Can at first calculate the quantity of Unidentified transponder in the foregoing description, then redefine the shift value N of need renewal and the code length M of quadrature cycle sign indicating number according to result of calculation, the frame length parameter in Query order and the AdjustQuery command parameter also can be determined according to result of calculation.Calculate the quantity of the unidentified transponder that goes out, can according to the answer signal quantity that receives in the present frame and can identify reply sign quantity, estimate the collision rate of answer signal in view of the above, and then estimate the quantity of Unidentified transponder.For example, more in the answer signal quantity that receives, but replying when identifying negligible amounts of can discerning, it is higher to estimate collision rate, and the promptly unidentified transponder that goes out is more.Perhaps whether the empty slot rate estimation according to present frame also has still Unidentified transponder.If Unidentified number of transponders is more, frame length that can corresponding increase next frame, can increase the code length M of quadrature cycle sign indicating number, can also increase shift value N, if unidentified number of transponders is less, can reduce the frame length of next frame, can reduce the code length M of quadrature cycle sign indicating number, can also reduce shift value N, thereby reduce the response time of carrying out a frame identification.Frame length parameter, quadrature cycle sign indicating number code length M and shift value N can adjust this three parameters simultaneously, also can combination in any adjust above-mentioned three parameters, come as the case may be to determine.
In the present embodiment, reader sends the AdjustQuery order and is equivalent to and has started the identification of next frame, so can select a new quadrature cycle sign indicating number, the quadrature cycle sign indicating number that adopts in the previous frame is upgraded.Choose new quadrature cycle sign indicating number and also can be further set the length of new quadrature reflected code according to the estimation result of the unidentified number of transponders that goes out.Can store the quadrature cycle sign indicating number collection of multiple length in advance according to the code length figure place in the reader, if Unidentified number of transponders is more, then can select the bigger quadrature cycle sign indicating number of length, can produce more orthogonal intersection, use for transponder, if unidentified number of transponders is less, then can select the less quadrature cycle sign indicating number of length, then reader needn't produce too much orthogonal intersection when despreading, also needn't carry out too much despreading and handle, can reduce the despreading response time.By control, can reduce the response time of identification equally to quadrature reflected code figure place.
Reading method embodiment two of the present invention, reader utilizes above-mentioned AdjustQuery order, according in the radio-frequency field still what of unidentified number of transponders adjust the code length of quadrature cycle sign indicating number, the frame length parameter and the shift value N of " time slot A LOHA " frame immediately, thereby according to circumstances change message transmission rate and every frame working time slot number, finally adjust total recognition time, be fit to different certain applications.
Be illustrated in figure 4 as the process flow diagram of rfid-transponder method specific embodiment one of the present invention, be mainly the answer method that transponder adopted in the radio-frequency recognition system of realizing the access of " time slot A LOHA " frame, the structural representation of transponder is shown in Figure 1B, and this method specifically comprises the steps:
Step 230, send this answer signal;
In the above-mentioned steps 210, can not comprise shift value N in the querying command, then transponder equals M-1 according to the code length M acquiescence shift value N of quadrature cycle sign indicating number, perhaps transponder can judge whether comprise shift value N in the querying command, if there is not shift value N, then the code length M acquiescence shift value N according to the quadrature cycle sign indicating number equals M-1, otherwise adopts this shift value N.
In the above-mentioned steps 220, transponder according to the specific implementation that the quadrature cycle sign indicating number that receives produces orthogonal intersection is: transponder is determined displacement side-play amount RN_m according to shift value N, this displacement side-play amount RN_m is the nonnegative integer that is less than or equal to shift value N, with the M position quadrature cycle sign indicating number that receives as the prototype spreading code, mobile RN_m position, the orthogonal intersection of generation transponder oneself.Perhaps transponder also can produce an integer at random the quadrature reflected code is shifted, and obtains spreading code.
In addition, transponder carries out also can further comprising before the band spectrum modulation and carries out the step of miller coding modulation to replying sign replying sign in step 220, then transponder carries out band spectrum modulation to the sign of replying after the modulation again, produce answer signal, to carry out the purpose of miller coding modulation be to make data become to help the bipolar code of collision detection to replying sign earlier.
Above-mentioned steps 230 sends the step of these answer signals, in the radio-frequency recognition system of realizing " time slot A LOHA ", Query order and AdjustQuery order include start the frame length parameter of inquiring about frame, specific implementation is:
Whether step 230b, judgment frame minislot parameter equal 0, if, execution in step 230d then, otherwise execution in step 230c;
Step 230c, judge whether to receive Requery order, if, then the frame slot parameter is subtracted 1, and execution in step 230b, otherwise execution in step 250;
Above-mentioned frame slot parameter is " time slot A LOHA " frame slot random number, frame slot parameter size is (0, L-1) in the scope, wherein L represents a frame length of " time slot A LOHA " agreement, be the frame length parameter that comprises in Query command parameter and the AdujustQuery order, the frame slot parameter is used for selecting a time slot to be used to send data at random at a frame of ALOHA agreement.Among the above-mentioned steps 230c, the ReQuery order is the order that startup is inquired about once more, after transponder receives this order, promptly adjusts the transmit status of transponder, and the frame slot parameter is subtracted 1, and continues to judge whether to satisfy in current time slots to send answer signal.
In the above-mentioned steps 230, transponder sends in the process of answer signal, also answer signal is carried out necessary processing, and as carrier modulation, so that send, this is those skilled in the art's a common practise, does not repeat them here.
In the above-mentioned steps 240, after transponder entered the affirmation state, expression success was discerned by reader, can no longer accept the identification of anticollision, and carry out follow-up exchanges data, so can comprise the steps:
Step 240a, transponder receive the Read order, judge whether to comprise to reply sign, if, execution in step 240b then, otherwise execution in step 240c;
Step 240b, transponder judge this reply sign whether with self to reply sign consistent, if, execution in step 240c then;
Step 240c, transponder adopt the orthogonal intersection that has produced to modulate the application data that self need send, and then send.
In the above-mentioned steps 250, the AdjustQuery order comprises the frame length parameter of next frame as starting the order of inquiry once more, can adjust the transmit status of transponder, promptly adjust the frame length parameter of present frame, from newly-generated frame slot parameter, carry out the identification of next frame, promptly continue execution in step 230.But,, do not receive the AdjustQuery order if after transponder enters waiting status, then be in waiting status all the time, may receive the Query order of new round radio-frequency (RF) identification, comprise the frame length parameter of quadrature cycle sign indicating number and present frame, then transponder has entered in the radio-frequency (RF) identification of a new round.
The advantage of rfid-transponder method specific embodiment one of the present invention is by adopting the prototype sign indicating number of the good quadrature cycle sign indicating number of autocorrelation performance and simple crosscorrelation performance as band spectrum modulation, realized the parallel identification of a plurality of RFID radio-frequency identification transponders, reduced recognition time than simple collision-proof method based on " time slot A LOHA " frame, can realize the quick identification of a large amount of RFID transponders, because the present invention has adopted the self-loopa orthogonality principle of quadrature cycle sign indicating number to produce frequency expansion sequence, make the manufacturing cost of transponder be in the allowed band, be convenient to adopt the chip technology of domestic and international main flow to realize.And answer method of the present invention has upgraded the frame length of present frame according to the AdjustQuery order that receives, and can adapt to the identification situation, has adjusted the time slot that the transponder circular wait determines at random and sends time of data.
Rfid-transponder method specific embodiment two of the present invention, roughly the same with the flow process of answer method embodiment one, difference is that step 250 is specially: transponder judges whether to receive and comprises new quadrature reflected code in the parameter, the frame length parameter of next frame and the AdjustQuery of shift value N order, if, the quadrature cycle sign indicating number and the shift value N that adopt before then upgrading with this new quadrature reflected code and shift value N, frame length parameter with the frame length parameter update present frame of next frame, and execution in step 220, again produce displacement side-play amount RN_m, from producing new orthogonal intersection, if do not comprise new quadrature cycle sign indicating number and shift value N, then direct execution in step 230 is used original orthogonal intersection, and band spectrum modulation is replied sign, then send the identification that enters next frame.The combination in any that can comprise quadrature cycle sign indicating number, shift value N and frame length parameter in the above-mentioned AdjustQuery command parameter, transponder is according to the current quadrature cycle sign indicating number that adopts of the Data Update in this parameter and/or shift value N and/or frame length parameter.
The advantage of the foregoing description is: not only comprise the frame length parameter in the AdjustQuery order that transponder received, also comprise new quadrature cycle sign indicating number and shift value N, the length of this quadrature cycle sign indicating number is that reader is set as the case may be, can adjust the consuming time of entire identification process.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (10)
1, a kind of radio frequency recognition reading method comprises the steps:
Step 11, be that the quadrature cycle sign indicating number of M is arranged in the parameter of querying command as current quadrature cycle sign indicating number with code length, determine shift value N according to code length M, described shift value N is the nonnegative integer less than described code length M, and sends described querying command; Wherein, M is a positive integer;
Step 12, produce the orthogonal dispreading sign indicating number according to described current quadrature cycle sign indicating number and described shift value N;
Step 13, utilize described orthogonal dispreading sign indicating number that one or more answer signal despreadings that received are handled, obtain replying sign;
Step 14, send and to comprise the described sign order of accepting one's fate really of replying;
Step 15, judge whether present frame finishes, if then execution in step 16;
Order is adjusted in step 16, transmission inquiry, carries out the identification of next frame.
2, radio frequency recognition reading method according to claim 1 is characterized in that: also comprise shift value N is arranged in the parameter of described querying command.
3, the reading method of radio-frequency (RF) identification according to claim 1, it is characterized in that: described step 16 is specially: redefine current quadrature cycle sign indicating number and/or redefine shift value N, and it is arranged in the parameter of described inquiry adjustment order, send described inquiry adjustment order, and execution in step 12.
4, according to claim 2 or 3 described radio frequency recognition reading methods, it is characterized in that: the step of described definite shift value N is specially: calculate the quantity of the unidentified transponder that goes out, determine shift value N according to result of calculation; Determine that perhaps shift value N equals M-1.
5, the reading method of radio-frequency (RF) identification according to claim 1 is characterized in that, also comprises: calculate the quantity of the unidentified transponder that goes out, and determine the code length M of described quadrature cycle sign indicating number to concentrate selected quadrature cycle sign indicating number from the quadrature cycle sign indicating number according to result of calculation.
6, radio frequency recognition reading method according to claim 1 is characterized in that: also comprise the quantity of calculating the unidentified transponder that goes out, and redefine querying command or inquiry according to result of calculation and adjust frame length parameter in the command parameter.
7, a kind of rfid-transponder method comprises the steps:
Step 21, reception comprise the querying command that code length is the quadrature cycle sign indicating number of M, and wherein, M is a positive integer;
Step 22, produce orthogonal intersection, adopt orthogonal intersection to carry out band spectrum modulation, produce answer signal replying sign according to described quadrature cycle sign indicating number;
Step 23, send described answer signal;
Step 24, judge whether to receive the confirmation order, if, then enter the affirmation state, otherwise execution in step 25;
Step 25, judge whether to receive inquiry and adjust order, if then carry out the identification of next frame.
8, rfid-transponder method according to claim 7 is characterized in that: also comprise judging whether comprise shift value N in the described querying command in the described step 21, if not, then determine that according to code length M shift value N equals M-1, wherein, N is a nonnegative integer.
9, according to claim 7 or 8 described rfid-transponder methods, it is characterized in that: the identification of carrying out next frame in the described step 25 is specially: judge in the described inquiry adjustment order whether comprise quadrature cycle sign indicating number and/or shift value N, if, quadrature cycle sign indicating number and/or the shift value N that upgrades current use with quadrature cycle sign indicating number in the described inquiry adjustment order and/or shift value N then, and execution in step 22, if all do not comprise, then execution in step 23.
10, rfid-transponder method according to claim 7, it is characterized in that: described step 25 also comprises: according to the frame length parameter of the frame length parameter update present frame in the parameter of inquiry adjustment order.
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| CN2007101453649A CN101281587B (en) | 2007-07-26 | 2007-09-11 | Radio frequency recognition reading method and answering method |
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Cited By (7)
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| CN102254130A (en) * | 2010-05-21 | 2011-11-23 | 刘礼白 | Direct sequence spread spectrum-based radio frequency identification parallel response time domain dispersion method |
| CN102754106A (en) * | 2009-12-23 | 2012-10-24 | 原子能和辅助替代能源委员会 | Method of protection in a contactless radiofrequency communication |
| CN103577784A (en) * | 2013-11-25 | 2014-02-12 | 电子科技大学 | Active RFID (radio frequency identification device) reader anti-collision method and system based on multiple radio frequency modules |
| CN104753835A (en) * | 2015-01-23 | 2015-07-01 | 北京信息科技大学 | Fragmented-adjustment channel parameter estimation implementation method for multiple receiving antennas of reader |
| CN106503603A (en) * | 2016-11-08 | 2017-03-15 | 湖南大学 | A kind of many reader RFID system fast tag recognition methods divided based on time slot |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100339860C (en) * | 2005-11-29 | 2007-09-26 | 东南大学 | Method for increasing through put for radio frequency recognition system |
| CN100524335C (en) * | 2006-09-22 | 2009-08-05 | 东南大学 | Multi-address switch-in anti-collision method implemented in circuit shift method |
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| CN102754106A (en) * | 2009-12-23 | 2012-10-24 | 原子能和辅助替代能源委员会 | Method of protection in a contactless radiofrequency communication |
| CN102254130A (en) * | 2010-05-21 | 2011-11-23 | 刘礼白 | Direct sequence spread spectrum-based radio frequency identification parallel response time domain dispersion method |
| CN102254130B (en) * | 2010-05-21 | 2013-12-18 | 刘礼白 | Direct sequence spread spectrum-based radio frequency identification parallel response time domain dispersion method |
| CN103577784A (en) * | 2013-11-25 | 2014-02-12 | 电子科技大学 | Active RFID (radio frequency identification device) reader anti-collision method and system based on multiple radio frequency modules |
| CN104753835A (en) * | 2015-01-23 | 2015-07-01 | 北京信息科技大学 | Fragmented-adjustment channel parameter estimation implementation method for multiple receiving antennas of reader |
| CN104753835B (en) * | 2015-01-23 | 2019-05-31 | 北京信息科技大学 | A kind of channel parameter estimation implementation method of the fragment adjustment of the more receiving antennas of reader |
| CN106503603A (en) * | 2016-11-08 | 2017-03-15 | 湖南大学 | A kind of many reader RFID system fast tag recognition methods divided based on time slot |
| CN106503603B (en) * | 2016-11-08 | 2019-03-29 | 湖南大学 | A kind of more reader RFID system fast tag recognition methods divided based on time slot |
| CN111127712A (en) * | 2019-12-26 | 2020-05-08 | 重庆集诚汽车电子有限责任公司 | Automatic learning method for remote controller of PEPS controller system |
| CN111127712B (en) * | 2019-12-26 | 2022-04-29 | 重庆集诚汽车电子有限责任公司 | Intelligent key automatic learning method based on PEPS controller |
| WO2022011843A1 (en) * | 2020-07-16 | 2022-01-20 | 中国科学院微电子研究所 | Signal processing method and device, and rfid system |
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