CN103116734A - Anti-collision method of RFID (Radio Frequency Identification) system based on power control - Google Patents
Anti-collision method of RFID (Radio Frequency Identification) system based on power control Download PDFInfo
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- CN103116734A CN103116734A CN2013100864945A CN201310086494A CN103116734A CN 103116734 A CN103116734 A CN 103116734A CN 2013100864945 A CN2013100864945 A CN 2013100864945A CN 201310086494 A CN201310086494 A CN 201310086494A CN 103116734 A CN103116734 A CN 103116734A
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Abstract
The invention discloses an anti-collision method based on power control and particularly relates to the anti-collision method of an RFID (Radio Frequency Identification) system. In a valid identifiable area of the RFID system, if excessive electronic tags exist, transmission power of an antenna of a reader is controlled to select a subset in the valid identifiable area to be only communicated with the electronic tags in a subset area; the probability of collisions is reduced due to the fact that the numbers of the electronic tags which respond to RFID commands are reduced at the same time; the existing anti-collision algorithms are combined to perform a recognition process at the same time; and then roll polling is performed on every subset to enable the total recognition time of all the electronic tags in the entire identifiable area to be reduced.
Description
Technical field
The present invention relates to a kind of collision-proof method of controlling based on power, particularly the rfid system collision-proof method.
Background technology
REID (RFID, Radio Frequency Identification) is a kind of of automatic identification technology, carries out the noncontact bidirectional data communication by wireless radio frequency mode, and related data is identified and obtained to target.Radio-frequency recognition system mainly is comprised of electronic tag, reader, data transmission and disposal system three parts.
During radio-frequency recognition system work, many labels are received the RF signal from single reader.In effective identified region of this reader, label is shared same wireless channel, due to interfering with each other between the back-scattered signal of a plurality of labels, thereby causes collision.The quantity of collision has a great impact for total recognition time of all labels in effective identified region.In order to reduce or to avoid collision, rfid system has been taked anti-collision algorithm on software, such as binary tree, ALOHA etc.But, rely on merely software to realize anticollision, be difficult to realize efficient identifying, if the support from the antenna of reader has been arranged, can make anticollision more effective.
Summary of the invention
The objective of the invention is to propose for the deficiencies in the prior art the collision-proof method that rfid system is controlled based on power.
For achieving the above object, the present invention adopts following technical scheme:
In the maximum identification range at reader, when having too much label to exist, control by the emissive power to the antenna of reader, select a subset of effective identified region, thereby only with this subset area in label communication, reduced because respond simultaneously the number of tags of RFID order, so the probability of collision has also just reduced, carried out identifying in conjunction with existing anti-collision algorithm simultaneously; Then each subset of poll, thus total recognition time of all labels in whole identified region can be shortened.
Start the condition of this collision-proof method, can according to existing the number of label manually to arrange in maximum identification range, perhaps automatically control according to the physical location distribution of label.
In the maximum identification range of reader, divide how many subsets zone and dividing subset zone how, can manually arrange or distribute according to the physical location of label and automatically control.
Description of drawings:
In order to be illustrated more clearly in inventive embodiments or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only one embodiment of the present of invention, for those of ordinary skills, do not paying under the prerequisite of creating work, can also obtain with reference to the accompanying drawings other accompanying drawing.
Fig. 1 is the collision-proof method schematic diagram that the present invention is based on power.
Embodiment:
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
For electronic tag collision probability in the effective identified region that reduces the RFID reader, reduce total recognition time of label; The present invention proposes the collision-proof method that a kind of rfid system is controlled based on power, see for details hereinafter and describe:
Many labels are received the RF signal from single reader.In effective identified region of this reader, label is shared same wireless channel, due to interfering with each other between the back-scattered signal of a plurality of labels, thereby causes collision.The quantity of collision has a great impact for total recognition time of all labels in identified region.In order to reduce or to avoid collision, rfid system has been taked the anticollision measure on software, such as binary tree, ALOHA etc.But the anticollision that relies on merely software to realize is difficult to realize efficient identifying.The present invention proposes the emissive power of the antenna of reader is controlled, select a subset of effective identified region, thereby only with this subset area in label communication, because responding simultaneously the number of tags of RFID order has reduced, so the probability of collision has also just reduced, carry out identifying in conjunction with existing anti-collision algorithm simultaneously; Then each subset of poll, thus total recognition time of all labels in whole identified region can be shortened.
Fig. 1 is that rfid system is based on the principle schematic of the collision-proof method of power control.Referring to Fig. 1, wherein T1 represents the tag set in effective identification range Smin, T2 representative is at effective identification range S2 but do not comprise the tag set of T1 in Smin, T3 representative is at effective identification range S3 but do not comprise the tag set of TI in T2 in S2, Smin, T4 representative Smax but do not comprise in T3 in S3, S2 the tag set of T1 in T2, Smin in effective identification range.
Figure 1 shows that example, in the maximum identification range Smax at reader, when having too much label to exist, reduce the emissive power of the antenna of reader, effective identified region is reduced to Smin, only that is to say that the tag set T1 with the Smin zone communicates; With tag set T1 sign off after, then to increase emissive power to effective identified region be S2 (comprising Smin), masks tag set T1, and only communicate with tag set T2; With tag set T2 sign off after, then to increase emissive power to effective identified region be S3 (comprising Smin and S2), masks tag set T1 and tag set T2, and only communicate by letter with tag set T3; At last, increase emissive power to maximum, namely maximum effectively identified region Smax, mask tag set T1, tag set T2 and tag set T3, and only communicate by letter with tag set T4.
In the present invention, start the condition of this collision-proof method, can according to existing the number of label manually to arrange in maximum identification range, perhaps automatically control according to the physical location distribution of label.
In the present invention, in the maximum identification range of reader, divide how many subsets zone and dividing subset zone how, can manually arrange or distribute according to the physical location of label and automatically control.
Further, reader can adopt circular polarized antenna or linear polarized antenna, and the embodiment of the present invention is not restricted this.
Further, reader can adopt the single antenna of low directivity or the multi-antenna array of high directivity, and the embodiment of the present invention is not restricted this.
The above is only preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1.RFID the collision-proof method that system controls based on power, it is characterized in that: in the maximum identification range at reader, when having too much label to exist, emissive power to the antenna of reader is controlled, select a subset of effective identified region, thus only with this subset area in label communication reduced because respond simultaneously the number of tags of RFID order, so the probability of collision has also just reduced, carry out identifying in conjunction with existing anti-collision algorithm simultaneously; Then each subset of poll, thus total recognition time of all labels in whole identified region can be shortened.
2. rfid system according to claim 1 is based on the collision-proof method of power control, it is characterized in that: the condition that starts collision-proof method, can according to existing the number of label manually to arrange in maximum identification range, perhaps automatically control according to the physical location distribution of label.
3. rfid system according to claim 1 based on the collision-proof method of power control, is characterized in that: in the maximum identification range of reader, divide how many subsets regional, can manually arrange or automatically control according to the physical location distribution of label.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2013100864945A CN103116734A (en) | 2013-03-19 | 2013-03-19 | Anti-collision method of RFID (Radio Frequency Identification) system based on power control |
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| CN2013100864945A CN103116734A (en) | 2013-03-19 | 2013-03-19 | Anti-collision method of RFID (Radio Frequency Identification) system based on power control |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103679096A (en) * | 2013-12-04 | 2014-03-26 | 上海理工大学 | Optimized RFID anti-collision method |
| CN104598940A (en) * | 2014-12-19 | 2015-05-06 | 中国印钞造币总公司 | Banknote transport bag electronic seal reading-writing method and device |
| CN104680104A (en) * | 2014-12-15 | 2015-06-03 | 天津工业大学 | Dynamic efficient RFID (Radio Frequency Identification Device) tag identification mechanism |
| CN106250788A (en) * | 2016-07-27 | 2016-12-21 | 天津工业大学 | The method of passive ultra-high frequency RFID system based on smart antenna suppression multi-path jamming |
| CN106682548A (en) * | 2016-12-27 | 2017-05-17 | 华东师范大学 | Multichannel power random change control method for RFID (radio frequency identification) reader collision preventing |
| CN110781700A (en) * | 2019-11-11 | 2020-02-11 | 湖南大学 | RFID multi-reader coordination method |
| CN113915940A (en) * | 2021-04-14 | 2022-01-11 | 海信（山东）冰箱有限公司 | Refrigerator and control method thereof |
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| WO2007018840A2 (en) * | 2005-07-20 | 2007-02-15 | Intelleflex Corporation | Ramped interrogation power levels |
| CN101142825A (en) * | 2005-02-10 | 2008-03-12 | 数据逻辑移动公司 | Rfid label filtration |
| CN101655899A (en) * | 2008-08-20 | 2010-02-24 | 中兴通讯股份有限公司 | Method and system for evaluating radio frequency identification electronic label |
| CN103049719A (en) * | 2013-01-18 | 2013-04-17 | 上海交通大学 | System and method for reading massive tags in radio frequency identification system |
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| CN101142825A (en) * | 2005-02-10 | 2008-03-12 | 数据逻辑移动公司 | Rfid label filtration |
| WO2007018840A2 (en) * | 2005-07-20 | 2007-02-15 | Intelleflex Corporation | Ramped interrogation power levels |
| CN101655899A (en) * | 2008-08-20 | 2010-02-24 | 中兴通讯股份有限公司 | Method and system for evaluating radio frequency identification electronic label |
| CN103049719A (en) * | 2013-01-18 | 2013-04-17 | 上海交通大学 | System and method for reading massive tags in radio frequency identification system |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103679096A (en) * | 2013-12-04 | 2014-03-26 | 上海理工大学 | Optimized RFID anti-collision method |
| CN104680104A (en) * | 2014-12-15 | 2015-06-03 | 天津工业大学 | Dynamic efficient RFID (Radio Frequency Identification Device) tag identification mechanism |
| CN104598940A (en) * | 2014-12-19 | 2015-05-06 | 中国印钞造币总公司 | Banknote transport bag electronic seal reading-writing method and device |
| CN104598940B (en) * | 2014-12-19 | 2017-11-10 | 中国印钞造币总公司 | A kind of method and device for transporting the read-write of paper money bag electronic sealing |
| CN106250788A (en) * | 2016-07-27 | 2016-12-21 | 天津工业大学 | The method of passive ultra-high frequency RFID system based on smart antenna suppression multi-path jamming |
| CN106682548A (en) * | 2016-12-27 | 2017-05-17 | 华东师范大学 | Multichannel power random change control method for RFID (radio frequency identification) reader collision preventing |
| CN110781700A (en) * | 2019-11-11 | 2020-02-11 | 湖南大学 | RFID multi-reader coordination method |
| CN110781700B (en) * | 2019-11-11 | 2021-05-14 | 湖南大学 | RFID multi-reader coordination method |
| CN113915940A (en) * | 2021-04-14 | 2022-01-11 | 海信（山东）冰箱有限公司 | Refrigerator and control method thereof |
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Application publication date: 20130522 |