CN100511261C - Multiple labels data collision detection method used for radio frequency recognizing - Google Patents
Multiple labels data collision detection method used for radio frequency recognizing Download PDFInfo
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- CN100511261C CN100511261C CNB2006101522790A CN200610152279A CN100511261C CN 100511261 C CN100511261 C CN 100511261C CN B2006101522790 A CNB2006101522790 A CN B2006101522790A CN 200610152279 A CN200610152279 A CN 200610152279A CN 100511261 C CN100511261 C CN 100511261C
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Abstract
The method comprises: adding a pulse burst region into the returned data frame before the label accesses to the reading device; said pulse burst region is divided into several sub time slots; the label needing to send data randomly selects one of sub time slots and generates a high level burst pulse; the rest time of the pulse burst region is low level; in time window corresponding to the pulse burst region of the label-namely pulse detecting region, the reading device detects the burst pulse and records the its numbers.
Description
Technical field
The present invention relates in a kind of wireless communication system multiple spot to the data collision detection method of some communication, particularly a kind of multiple labels data collision detection method that is used for RFID (Radio Frequency Identification, radio-frequency (RF) identification) system.
Background technology
In rfid system, when a plurality of labels during simultaneously with reader communication, owing to be in identical answer channel, data collision (or collision) can take place.In existing technology and RFID standard, whether conflict in replying at the same time for a plurality of labels, be to judge by the decoding situation of digital coding in the Frame.
In the prior art, the judged result whether data collision takes place for many labels only is conflict or does not conflict, and can not further provide the information of more relevant conflict, such as the number of the label that clashes.In addition, present collision detection method can not be distinguished the data transmission fails of the data collision and the single label of a plurality of labels, unified owing to conflict when detecting mistake, so not only can not accurately estimate conflict situations, and the channel circumstance can not understand label and reader communication the time, even cause the more data conflict.
Summary of the invention
The technical problem to be solved in the present invention is the deficiency that overcomes multiple labels data collision detection method in the prior art, and a kind of multiple labels data collision detection method that detects multiple labels data collision more accurately and the number of tags that data collision takes place is provided is provided.
To achieve these goals, the invention provides a kind of multiple labels data collision detection method that is used for radio-frequency (RF) identification, this method comprises following steps:
A. add pulse burst region in the answer Frame before label inserts reader;
B. this pulse burst region is divided into the plurality of sub time slot, and desire sends the label of data in the plurality of sub time slot, one of picked at random, and the burst of a high level of generation, all the other times of pulse burst region are low level;
C. reader with the pulse burst region time corresponding window of label in, promptly detect burst in the pulse detection district, and the record number of conflicts.
In addition, the leader of Frame is replied in the position of described pulse burst region at label.When including synchrodata in the leader of described label answer Frame, described pulse burst region is positioned at after the synchrodata.
In addition, front end and the end in described pulse burst region is provided with protection at interval with accurate detection burst.
The present invention can detect multiple labels data collision more accurately by adopting leading random pulses collision detection method, and the number of tags that data collision takes place is provided, and makes many labels access efficiency and rfid system overall performance be improved.
Description of drawings
Fig. 1 is the data frame structure synoptic diagram that multiple labels data collision detection method adopted that the present invention is used for radio-frequency (RF) identification;
Fig. 2 is the embodiment synoptic diagram of the present invention's multiple labels data collision detection method of being used for radio-frequency (RF) identification.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in detail.
Technical scheme main points of the present invention are: the label that desire sends data one of picked at random in the plurality of sub time slot of pulse burst region, and produce the burst of a high level, reader with the random pulses burst region time corresponding window of label in detect burst, and record number of conflicts.
Fig. 1 is the data frame structure synoptic diagram that multiple labels data collision detection method adopted that the present invention is used for radio-frequency (RF) identification.
As shown in Figure 1, the pulse burst region that adds the certain hour width in the answer Frame before label inserts reader, the leader of Frame is replied in the position of this pulse burst region at label, when including synchrodata in the leader of label answer Frame, described pulse burst region is positioned at after the synchrodata.
This pulse burst region is divided into the plurality of sub time slot, and desire sends the label of data in the plurality of sub time slot, one of picked at random, and the burst of a high level of generation, all the other times of pulse burst region are low level.
Reader with the random pulses burst region time corresponding window of label in, promptly detect burst in the pulse detection district, and the record number of conflicts.
In addition, in order accurately to detect pulse, at pulse burst region front end and the terminal protection interval that is provided with the certain hour width.Protection can be set at interval one section complete 0 or complete 1 or the signal of other specific format, so that reader correctly detects the starting and ending position of pulse burst region, is pulse signal with preventing reading with other signal error ground detection,
In addition, in this method the number of the length of pulse burst region and sub-slots by the system resource situation, reply the label number and reduce the requirement decision of the pulse overlap probability in the sub-slots.
In addition, the selected sub-slots of a plurality of labels can be identical, so under the situation that label is replied simultaneously, pulse meeting in the identical sub-slots overlaps (or conflict), consequently reader can't detect burst, be single perhaps, caused inaccurate judgement the label collision situation with a plurality of pulse detection.At this situation, can make that the probability of pulse overlap is enough little by adjusting the sub-slots number for different answer number of tags.
Below in conjunction with Fig. 2, the multiple labels data collision detection method that is used for radio-frequency (RF) identification of the present invention is described.
Fig. 2 is the embodiment synoptic diagram of the present invention's multiple labels data collision detection method of being used for radio-frequency (RF) identification.As shown in Figure 2, be located at certain and reply in the time slot, the sub-slots that label is replied pulse burst region in the Frame is 8, and label (or Frame) number that should reply at this time slot is 3, is respectively A, B, C.A is chosen in the 1st sub-slots and sends pulse; B is chosen in the 3rd sub-slots and sends pulse; C is chosen in the 5th time slot and sends pulse; A, B, C reply simultaneously, and reader detects the signal from label on the official hour interval, and the pulse number in the record data frame.By detecting, find 3 pulses in the detection time of reader end in the window, reply simultaneously so be judged to be 3 labels, clash, the label number of conflict is 3.
Claims (3)
1, a kind of multiple labels data collision detection method that is used for radio-frequency (RF) identification is characterized in that, this method comprises following steps:
A. add pulse burst region in the answer Frame before label inserts reader, the leader of Frame is replied in the position of described pulse burst region at label;
B. this pulse burst region is divided into the plurality of sub time slot, and desire sends the label of data in the plurality of sub time slot, one of picked at random, and the burst of a high level of generation, all the other times of pulse burst region are low level;
C. reader with the pulse burst region time corresponding window of label in, promptly detect burst in the pulse detection district, and the record number of conflicts.
2, the multiple labels data collision detection method that is used for radio-frequency (RF) identification as claimed in claim 1 is characterized in that, when including synchrodata in the leader of described label answer Frame, described pulse burst region is positioned at after the synchrodata.
3, the multiple labels data collision detection method that is used for radio-frequency (RF) identification as claimed in claim 1 is characterized in that, is provided with protection at interval with accurate detection burst at the front end of described pulse burst region and end.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101522790A CN100511261C (en) | 2006-09-27 | 2006-09-27 | Multiple labels data collision detection method used for radio frequency recognizing |
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| CNB2006101522790A CN100511261C (en) | 2006-09-27 | 2006-09-27 | Multiple labels data collision detection method used for radio frequency recognizing |
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| CN101136057A CN101136057A (en) | 2008-03-05 |
| CN100511261C true CN100511261C (en) | 2009-07-08 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102982294B (en) * | 2011-09-05 | 2015-12-02 | 国民技术股份有限公司 | A kind of collision detection method utilizing magnetic two-way communication |
| CN103336937B (en) * | 2013-06-21 | 2016-08-10 | 无锡赛睿科技有限公司 | A kind of radio-frequency (RF) tag number estimation method based on geometric distribution |
| CN106714100A (en) * | 2015-11-18 | 2017-05-24 | 中兴通讯股份有限公司 | Terminal locating method and device |
| CN106324561A (en) * | 2016-08-09 | 2017-01-11 | 上海优璞信息科技有限公司 | Distributed asynchronous positioning system and method based on ultra-wide band |
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Effective date of registration: 20161009 Address after: 300308 Tianjin Airport Economic Zone, Binhai New Area seven East Road No. 2 Zhongxing Industrial Base Patentee after: ZTE INTELLIGENT IOT TECHNOLOGY Co.,Ltd. Address before: 518057 Nanshan District high tech Industrial Park, Guangdong, South Road, science and technology, ZTE building, legal department Patentee before: ZTE Corp. |
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Address after: Room 401, building 12, east area, airport business park, No. 80, Huanhe North Road, free trade zone (Airport Economic Zone), Binhai New Area, Tianjin 300000 Patentee after: Gaoxing Zhilian Technology Co.,Ltd. Address before: 300308, Zhongxing Industrial base, 2 East seven, Airport Economic Zone, Tianjin Binhai New Area Patentee before: ZTE INTELLIGENT IOT TECHNOLOGY Co.,Ltd. |
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Address after: Room 401, building 12, East Airport Business Park, 80 Huanhe North Road, Tianjin Binhai New Area pilot free trade zone (Airport Economic Zone) Patentee after: Zte Intelligent Iot Technology Co.,Ltd. Address before: Room 401, building 12, East Airport Business Park, 80 Huanhe North Road, Tianjin Binhai New Area pilot free trade zone (Airport Economic Zone) Patentee before: Gaoxing Zhilian Technology Co.,Ltd. |
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