CN102521555A - Wakeup signal matching method - Google Patents
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- CN102521555A CN102521555A CN2011103707858A CN201110370785A CN102521555A CN 102521555 A CN102521555 A CN 102521555A CN 2011103707858 A CN2011103707858 A CN 2011103707858A CN 201110370785 A CN201110370785 A CN 201110370785A CN 102521555 A CN102521555 A CN 102521555A
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Abstract
The invention discloses a wakeup signal matching method and device as well as a tag, which are applied to a radio frequency identification system. The wakeup signal matching method comprises the following steps of: sending a wakeup signal to the tag by a reader, wherein the wakeup signal is composed of a plurality of square waves with certain frequency; and judging whether the tag receives the wakeup signal in a square wave matching manner or not; if so, switching the tag from a dormant state to a working state. According to the method in the radio frequency identification system for solving the error wakeup of the active tag provided by the invention, the cost of the active tag is reduced, the defect of the mistaken wakeup of the active tag is solved, and the power consumption of the active tag is reduced. Furthermore, the volume of the active tag is reduced and various application fields can be met.
Description
Technical field
The present invention relates to the REID field, relate in particular to a kind of wake-up signal matching process, device and label.
Background technology
RF identification (Radio Frequency Identify; Abbreviate RFID as) be a kind of contactless automatic identification technology; It is through the automatic recognition objective object of radiofrequency signal and obtain related data, and identification work need not manual intervention, can work in various rugged surroundings.The RFID technology can be discerned high-speed moving object and can discern a plurality of labels simultaneously, and is swift and convenient to operate.
Radio-frequency recognition system mainly comprises label and read write line.RFID comprises passive radio frequency identification and active RF identification, and both essential distinctions are in tab end.Label specifically is divided into active electronic label, half active electronic label and passive electronic label.
Active electronic label is the symmetrical active label again, and the working power of label is fully by the internal cell power supply, and the energy supply of tag battery simultaneously also partly converts electronic tag and the required RF energy of reader communication to.
Powered battery in half passive electronic label only to requiring power supply to keep the auxiliary support of the circuit or the label chip work required voltage of data in the label, supply power by power consumption tag circuit seldom own.Before label does not get into duty, be in dormant state always, be equivalent to passive label, label internal cell energy consumption seldom, so battery can keep several years, even reached 10 years effectively; When label get into reader read the zone time; Receive the energizes that reader sends; When getting into duty; The energy support of message exchange between label and the reader is master's (reflection modulation mode) with the RF energy of reader supply, and the effect of label internal cell mainly is to remedy the radio field intensity deficiency of label present position, and the energy of label internal cell does not convert RF energy into.
Passive electronic label is claimed passive label again; Do not have internal battery, in the time of outside the read range of reader, electronic tag is in passive states; In the time of within the read range of reader, electronic tag extracts the required power supply of its work from the RF energy that reader sends.Passive electronic label generally all adopts the reflection modulation mode to accomplish the transmission of electronic labeling information to reader.
Self has powered battery active electronic label, and reading/writing distance is far away, and volume is bigger, and cost is higher, and weak point is that battery can not use for a long time, needs to change battery after the depleted of energy.
Active label normally is in a kind of holding state of low-power consumption, and label internal cell energy consumption is seldom only needing just to consume limited electric energy in the very short time of work, and therefore, battery life can be very long.Existing active label can be divided into following two kinds according to waking mode up: a kind of is through hardware circuit or chip wake-up signal to be mated; A kind of is to realize through software.
But, existing above-mentioned two kinds of active labels part that all comes with some shortcomings: through hardware circuit or chip wake-up signal is mated, but its cost is higher, is not easy to promote; And through the coupling of basically not carrying out wake-up signal that software is realized, finding in the practical application often has other electromagnetic interference (EMI) to cause active label by false wake-up, like other electromagnetic interference (EMI); Mainly be the mobile phone signal in space etc., and be easy to false wake-up, as long as even reach and have signal just to wake up; At this moment, active label is thought needs work, and actual be invalid undesired signal; Thereby cause the power consumption of label, and also influenced the serviceable life of battery greatly.
Summary of the invention
The technical matters that the present invention solves provides a kind of wake-up signal matching process, device and label, can solve active label by the defective of false wake-up, reduces the power consumption of active label.
For solving the problems of the technologies described above, the invention provides a kind of wake-up signal matching process, be applied to radio-frequency recognition system, said method comprises:
Reader sends wake-up signal to label, and said wake-up signal is made up of a plurality of square waves of fixed frequency;
Said label judges whether to receive wake-up signal through the mode of coupling square wave, receives wake-up signal if judge, and then switches to duty from dormant state.
Further, said label judges whether to receive wake-up signal through the mode of coupling square wave, comprising:
Said label judges whether the number that matches square wave continuously reaches predetermined coupling square wave number, if reach, then judges to receive wake-up signal.
Further, said label judges in the following manner whether the number that matches square wave continuously reaches predetermined said coupling square wave number:
Whether the number of adding up continuous square wave saltus step interruption reaches predetermined saltus step number, if reach, judges that then the number that matches square wave continuously reaches predetermined said coupling square wave number;
Wherein, said saltus step number is that said coupling square wave number adds 2.
Further, said method also comprises:
Carry out timing at second square wave rising edge or negative edge IE timer; When N square wave rising edge or negative edge interruption, confirm the timing time of said timer; And judge whether to satisfy the frequency range of square wave according to said timing time; If satisfy, then judge to match this N square wave; Otherwise, judge not match this N square wave; Wherein, N is more than or equal to 3.
Further, said label comprises the wake-up signal matching unit,
Said wake-up signal matching unit is used for, and judges whether to receive wake-up signal through the mode of mating square wave, receives wake-up signal if judge, and then switches to duty from dormant state.
Further, said wake-up signal matching unit judges whether to receive wake-up signal through the mode of coupling square wave, comprising:
Judge whether the number that matches square wave continuously reaches predetermined coupling square wave number,, then judge to receive wake-up signal if reach.
Further; Said wake-up signal matching unit also is used for; Carry out timing at second square wave rising edge or negative edge IE timer, when N square wave rising edge or negative edge interruption, confirm the timing time of said timer, and judge whether to satisfy the frequency range of square wave according to said timing time; If satisfy, then judge to match this N square wave; Otherwise, judge not match this N square wave; Wherein, N is more than or equal to 3.
Further, be applied to radio-frequency recognition system, said device comprises reader and label, and said reader comprises the wake-up signal transmitting element, and said label comprises the wake-up signal matching unit, wherein:
Said wake-up signal transmitting element is used for, and sends wake-up signal to label, and said wake-up signal is made up of a plurality of square waves of fixed frequency;
Said wake-up signal matching unit is used for, and judges whether to receive wake-up signal through the mode of mating square wave, receives wake-up signal if judge, and then switches to duty from dormant state.
Further, said wake-up signal transmitting element is used for, and order is sent said wake-up signal to said label through eating dishes without rice or wine;
Said wake-up signal matching unit is used for, and judges whether to receive wake-up signal according to the mode of following coupling square wave: judge whether the number that matches square wave continuously reaches predetermined coupling square wave number, if reach, then judge to receive wake-up signal.
Further; Said wake-up signal matching unit also is used for; Carry out timing at second square wave rising edge or negative edge IE timer, when N square wave rising edge or negative edge interruption, confirm the timing time of said timer, and judge whether to satisfy the frequency range of square wave according to said timing time; If satisfy, then judge to match this N square wave; Otherwise, judge not match this N square wave; Wherein, N is more than or equal to 3.
The present invention has following beneficial effect at least: the present invention proposes to solve in a kind of radio-frequency recognition system the method for active label false wake-up, reduces the active label cost, solves active label by the defective of false wake-up, reduces the power consumption of active label; In addition, reduce the active label volume, can satisfy plurality of application scenes.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the synoptic diagram of coupling wake-up signal provided by the invention;
Fig. 2 is the method flow diagram of the coupling wake-up signal of the embodiment of the invention.
Embodiment
For solving the problem of active label false wake-up in the radio-frequency recognition system; The present invention proposes a kind of wake-up signal matching process; Its core concept is: send the order of eating dishes without rice or wine to label when reader and label communication, the order of label response reader realizes communicating by letter between reader and the label; Have wake-up signal in the order that reader sends, promptly notified tag switches to duty from dormant state.
Wherein, wake-up signal generally is made up of several square waves of fixed frequency.Specifically take the methods of continuous 4 coupling square waves in order to judge whether to be wake-up signal, the present invention preferably.Owing to be square wave, therefore there is not the difference of phase place, interrupt thinking that having accomplished 4 square waves matees as long as catch 6 saltus steps continuously.
Saltus step number N and coupling square wave number n satisfy the relation of N=n+2.
The number n of wherein mating square wave can suitably increase according to the effect of reality or reduce.
Matching algorithm of the present invention mainly is divided into following a few step:
The first step, first negative edge interrupt doing a little basic setups, comprise that timer configuration, active electronic label state are provided with etc.
In second step, second negative edge interrupts opening timer and picks up counting.
Described timing; Can realize through the inner hardware timer of processor; For example the configuration register of software setting timer can start timer and begin counting, confirms timing time through the count value that reads timer when needed, promptly obtains the duration of process.
The 3rd step; The 3rd negative edge interrupts judging whether to satisfy a square-wave cycle (also promptly judging whether to be complementary with the frequency of wake-up signal), then proceeds follow-up coupling if satisfy, and then gets back to for second step and restarts coupling if do not satisfy; Till overtime, withdraw from.
In the 4th step, the 4th negative edge judges whether to satisfy two square-wave cycle, then proceeds follow-up coupling if satisfy, and then do not withdraw from dormancy if do not satisfy.
In the 5th step, the 5th negative edge judges whether to satisfy three square-wave cycle, then proceeds follow-up coupling if satisfy, and then do not withdraw from dormancy if do not satisfy.
In the 6th step, the 6th negative edge judges whether to satisfy four square-wave cycle, then matees successfully if satisfy, and carries out Physical layer and receives, and then do not withdraw from dormancy if do not satisfy.
Wherein, above-mentioned dormancy or overtime withdrawing from all are to judge in the circulation outside interrupting, and interrupt inside corresponding zone bit decision round-robin treatment scheme can be set, if that is: interrupt the success of inner coupling wake-up signal, then with zone bit set.Interrupt this zone bit of outer circulation internal judgment,, just withdraw from matching process, carry out the follow-up data receiving course if the judgement symbol position has been set.
For making the object of the invention, technical scheme and advantage clearer, hereinafter will combine accompanying drawing that embodiments of the invention are elaborated.Need to prove that under the situation of not conflicting, embodiment among the application and the characteristic among the embodiment be combination in any each other.
With reference to shown in Figure 1, the negative edge of square wave can produce wake-up interrupts, carries out the setting of timer in once interrupting, and the counting clock frequency that timer is provided with can not be too fast, be complementary with the frequency of wake-up signal, generally can be made as 0.5-1.5MHz; Secondary interrupts then starting timer and picks up counting, and reads count value in the timer during three interruptions, and draws timing time according to the count value that this reads; And then judge whether to satisfy the frequency range of a square wave, (because counting clock fixes, therefore; Can calculate through how long according to this count value; Be the cycle, the inverse in cycle is frequency, judges whether this frequency that calculates satisfies the frequency range of a square wave; And then judge whether roughly conform to the frequency of wake-up signal) satisfy and then to continue coupling, otherwise coupling again.Follow-up said process repeatedly thinks that wake-up signal matees successfully when continuous the coupling successfully behind 4 square waves, opens the radio frequency reception and carries out Data Receiving, and as not mating successfully within a certain period of time, then overtime withdrawing from continued dormancy.
With reference to shown in Figure 2, the coupling flow process of the wake-up signal of the embodiment of the invention is described below:
1) after the wake-up interrupts, judge whether it is state 0, interrupting acquiescence first is state 0, the setting before state matees for 0 time, and tag state is set to 1 simultaneously.
2) 1 time beginning timer counting of state is changed to 2 with tag state simultaneously, in state 1, can judge whether whole coupling is overtime, overtime then dormancy, otherwise continue to receive.
3) judge whether to satisfy one in the state 2 and wake the square wave frequency requirement up, satisfied then restart counting, state is changed to 3, otherwise state is changed to 1 again, continue reception.
4) judge whether to satisfy two in the state 3 and wake the square wave frequency requirement up, satisfied then restart to count, state is changed to 4, otherwise state is reset to 0 again, dormancy.
5) judge whether to satisfy three in the state 4 and wake the square wave frequency requirement up, satisfied then restart to count, state is changed to 5, otherwise state is reset to 0 again, dormancy.
6) judge whether in the state 5 that satisfying four wakes the square wave frequency requirement up, then be set to merit coupling wake-up signal sign if satisfy, otherwise state be reset to 0 again, dormancy.
If other state outside the above-mentioned state occurs, then think illegal state, software is done reset processing.
Describe in conjunction with above, the inventive method increases the coupling flow process of wake-up signal, and this flow process has not only been accomplished the coupling of wake-up signal, follow-up data is received also played good synchronous effect.
In addition, need to prove that the version overlay area of adopting the present invention to increase the wake-up signal coupling has dwindled.This is because the energy of spacing wave can produce loss in communication process, the signal energy that is in the edge, overlay area a little less than, the signal effect that label receives is also relatively poor.If the coupling wake-up signal is equivalent to signal effect is had relatively high expectations, so the same terms can dwindle the overlay area of coupling wake-up signal down.But this variation is not very greatly, can satisfy requirement of actual application fully.
In addition, a kind of label is provided also in the embodiment of the invention, this label comprises a wake-up signal matching unit,
Said wake-up signal matching unit is used for, and judges whether to receive wake-up signal through the mode of mating square wave, receives wake-up signal if judge, and then switches to duty from dormant state.
Further, said wake-up signal matching unit judges whether to receive wake-up signal through the mode of coupling square wave, comprising:
Judge whether the number that matches square wave continuously reaches predetermined coupling square wave number,, then judge to receive wake-up signal if reach.
Further; Said wake-up signal matching unit also is used for; Carry out timing at second square wave rising edge or negative edge IE timer, when N square wave rising edge or negative edge interruption, confirm the timing time of said timer, and judge whether to satisfy the frequency range of square wave according to said timing time; If satisfy, then judge to match this N square wave; Otherwise, judge not match this N square wave; Wherein, N is more than or equal to 3.
In addition, a kind of wake-up signal coalignment is provided also in the embodiment of the invention, has been applied to radio-frequency recognition system; This device comprises reader and label; Reader further comprises the wake-up signal transmitting element, and label further comprises the wake-up signal matching unit, wherein:
Said wake-up signal transmitting element is used for, and sends wake-up signal to label, and said wake-up signal is made up of a plurality of square waves of fixed frequency;
Said wake-up signal matching unit is used for, and judges whether to receive wake-up signal through the mode of mating square wave, receives wake-up signal if judge, and then switches to duty from dormant state.
Further, said wake-up signal transmitting element is used for, and order is sent said wake-up signal to said label through eating dishes without rice or wine;
Said wake-up signal matching unit is used for, and judges whether to receive wake-up signal according to the mode of following coupling square wave: judge whether the number that matches square wave continuously reaches predetermined coupling square wave number, if reach, then judge to receive wake-up signal.
Further; Said wake-up signal matching unit also is used for; Carry out timing at second square wave rising edge or negative edge IE timer, when N square wave rising edge or negative edge interruption, confirm the timing time of said timer, and judge whether to satisfy the frequency range of square wave according to said timing time; If satisfy, then judge to match this N square wave; Otherwise, judge not match this N square wave; Wherein, N is more than or equal to 3.
The present invention can be used for different application scenes, is applied as example with the GB electric non-stop toll below and introduces the application of the present invention in these scenes.
Its wake-up signal was a 15-17 14KHz square wave during GB ETC used.Only wake link and CPU after active label wakes up up in work,, can when just waking up, reduce CPU frequency as much as possible with save power because the speed of 14K is very low.
It is 11K-16.7K that matching range at first is set; The coupling number is 4 14K square waves; About coupling square wave number, see the square wave that can receive under the label normal condition about 7 through the reception waveform that grasps tab end, be about about 5 and receive waveform under other antennas; Find that through actual sport car test 3 square waves of coupling still have certain this routine false wake-up, 4 square waves of final decision coupling are realized software filtering.
Carried out the sport car test at the scene, 3 labels in the car, 40Km-100Km tests in the speed of a motor vehicle, success ratio 100%.It seems what influence the software version that has increased the 14K coupling does not have to the Transaction Success rate.
At last the power savings of this scheme is analyzed:
Battery electric quantity is generally 1500mA/h, and available this example is about 0.7, i.e. 1500*0.7=1050mA/h.Each exchange hour is 50ms, the about 30mA of power consumption, but transaction count is about under the perfect condition: 1050/ (0.05/3600*30)=2,520,000 time.
If be under the false wake-up accepting state always, about 1050/16=65.6 of power consumption time of battery hour, just do not have electricity in promptly 3 days.
Through 14K coupling, even be under the false wake-up state, electric current has only 140uA, be before electric current 1/90, promptly can adhere to about 5740 hours.It seems that battery life becomes original about 90 times, can satisfy actual request for utilization through the false wake-up coupling.
More than be merely preferred case study on implementation of the present invention; Be not limited to the present invention; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof, those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the memory storage and carry out, and in some cases, can carry out step shown or that describe with the order that is different from here by calculation element; Perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
Claims (7)
1. a wake-up signal matching process is characterized in that, is applied to radio-frequency recognition system, and said method comprises:
Reader sends the said wake-up signal of wake-up signal to label and is made up of a plurality of square waves of fixed frequency;
Said label judges whether to receive wake-up signal through the mode of coupling square wave, receives wake-up signal if judge, and then switches to duty from dormant state.
2. the method for claim 1 is characterized in that,
Said label judges whether to receive wake-up signal through the mode of coupling square wave, comprising:
Said label judges whether the number that matches square wave continuously reaches predetermined coupling square wave number, if reach, then judges to receive wake-up signal.
3. method as claimed in claim 2 is characterized in that,
Said label judges in the following manner whether the number that matches square wave continuously reaches predetermined said coupling square wave number:
Whether the number of adding up continuous square wave saltus step interruption reaches predetermined saltus step number, if reach, judges that then the number that matches square wave continuously reaches predetermined said coupling square wave number;
Wherein, said saltus step number is that said coupling square wave number adds 2.
4. like claim 2 or 3 described methods, it is characterized in that said method also comprises:
Carry out timing at second square wave rising edge or negative edge IE timer; When N square wave rising edge or negative edge interruption, confirm the timing time of said timer; And judge whether to satisfy the frequency range of square wave according to said timing time; If satisfy, then judge to match this N square wave; Otherwise, judge not match this N square wave; Wherein, N is more than or equal to 3.
5. a label is characterized in that, said label comprises the wake-up signal matching unit,
Said wake-up signal matching unit is used for, and judges whether to receive wake-up signal through the mode of mating square wave, receives wake-up signal if judge, and then switches to duty from dormant state.
6. label as claimed in claim 5 is characterized in that,
Said wake-up signal matching unit judges whether to receive wake-up signal through the mode of coupling square wave, comprising:
Judge whether the number that matches square wave continuously reaches predetermined coupling square wave number,, then judge to receive wake-up signal if reach.
7. label as claimed in claim 6 is characterized in that,
Said wake-up signal matching unit also is used for; Carry out timing at second square wave rising edge or negative edge IE timer; When N square wave rising edge or negative edge interruption, confirm the timing time of said timer; And judge whether to satisfy the frequency range of square wave according to said timing time, if satisfy, then judge to match this N square wave; Otherwise, judge not match this N square wave; Wherein, N is more than or equal to 3.
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Cited By (8)
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| CN102867204A (en) * | 2012-09-21 | 2013-01-09 | 东信和平科技股份有限公司 | Method for controlling electronic school badge to send and receive data and electronic school badge capable of realizing method for controlling electronic school badge to send and receive data |
| CN103198346A (en) * | 2013-01-16 | 2013-07-10 | 东信和平科技股份有限公司 | Inputting method of active radio frequency tag controlling information and active radio frequency tag |
| CN104574529A (en) * | 2013-11-29 | 2015-04-29 | 深圳市金溢科技股份有限公司 | Method for improving awakening performance of on-board unit and on-board unit for implementing method |
| CN106863319A (en) * | 2017-01-17 | 2017-06-20 | 北京光年无限科技有限公司 | A kind of robot awakening method and device |
| CN110264649A (en) * | 2019-06-26 | 2019-09-20 | 佛山市顺德区海得曼电器有限公司 | The electricity saving method of wireless doorbell |
| CN110309093A (en) * | 2019-06-17 | 2019-10-08 | 深圳和而泰小家电智能科技有限公司 | A kind of data transmission circuit and method |
| CN110928212A (en) * | 2019-09-19 | 2020-03-27 | 中兴通讯股份有限公司 | Wake-up circuit and wake-up method |
| CN111309385A (en) * | 2020-01-17 | 2020-06-19 | 高新兴物联科技有限公司 | Interrupt awakening method and device, electronic equipment and readable storage medium |
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- 2011-11-21 CN CN2011103707858A patent/CN102521555A/en active Pending
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| CN102867204A (en) * | 2012-09-21 | 2013-01-09 | 东信和平科技股份有限公司 | Method for controlling electronic school badge to send and receive data and electronic school badge capable of realizing method for controlling electronic school badge to send and receive data |
| CN102867204B (en) * | 2012-09-21 | 2016-04-27 | 东信和平科技股份有限公司 | Control the method for Electronic school badges transceiving data and the Electronic school badges of the method can be realized |
| CN103198346A (en) * | 2013-01-16 | 2013-07-10 | 东信和平科技股份有限公司 | Inputting method of active radio frequency tag controlling information and active radio frequency tag |
| CN103198346B (en) * | 2013-01-16 | 2016-04-13 | 东信和平科技股份有限公司 | A kind of input method of active radio frequency label control information and active radio frequency label |
| CN104574529A (en) * | 2013-11-29 | 2015-04-29 | 深圳市金溢科技股份有限公司 | Method for improving awakening performance of on-board unit and on-board unit for implementing method |
| CN106863319A (en) * | 2017-01-17 | 2017-06-20 | 北京光年无限科技有限公司 | A kind of robot awakening method and device |
| CN110309093A (en) * | 2019-06-17 | 2019-10-08 | 深圳和而泰小家电智能科技有限公司 | A kind of data transmission circuit and method |
| CN110264649A (en) * | 2019-06-26 | 2019-09-20 | 佛山市顺德区海得曼电器有限公司 | The electricity saving method of wireless doorbell |
| CN110264649B (en) * | 2019-06-26 | 2022-10-14 | 佛山市顺德区海得曼电器有限公司 | Power saving method of wireless doorbell |
| CN110928212A (en) * | 2019-09-19 | 2020-03-27 | 中兴通讯股份有限公司 | Wake-up circuit and wake-up method |
| CN111309385A (en) * | 2020-01-17 | 2020-06-19 | 高新兴物联科技有限公司 | Interrupt awakening method and device, electronic equipment and readable storage medium |
| CN111309385B (en) * | 2020-01-17 | 2023-02-07 | 高新兴物联科技股份有限公司 | Interrupt awakening method and device, electronic equipment and readable storage medium |
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Application publication date: 20120627 |