CN1313011A - Synchronization method for RFID system including tags having different memory sizes - Google Patents
Synchronization method for RFID system including tags having different memory sizes Download PDFInfo
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- CN1313011A CN1313011A CN99803980A CN99803980A CN1313011A CN 1313011 A CN1313011 A CN 1313011A CN 99803980 A CN99803980 A CN 99803980A CN 99803980 A CN99803980 A CN 99803980A CN 1313011 A CN1313011 A CN 1313011A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/20—Individual registration on entry or exit involving the use of a pass
- G07C9/28—Individual registration on entry or exit involving the use of a pass the pass enabling tracking or indicating presence
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
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- Computer Networks & Wireless Communication (AREA)
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- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Near-Field Transmission Systems (AREA)
- Detection And Correction Of Errors (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
A synchronization method for an RFID system (10) including tags (40-1 to 40-n) having different memory sizes, employs a convention wherein sync words and sync bits are stored in tag memory (407) among data bits so that a reader (30) may readily identify the sync word on an RF signal (408) transmitted by a tag (40-1) and serially modulated by repetitions of the contents of the tag memory (407). After identifying the sync word, an RFID reader (30) reads data bits following the identified sync word until a next sync word is received, while ignoring the sync bits interspersed among the data bits.
Description
The applicant requires application on March 13rd, 1998 such as Kirk B.Bierach, application number is 60/077, the priority of 987 provisional application formerly, this formerly the inventor of provisional application with of the present invention identical, and with this formerly the full content of provisional application be hereby expressly incorporated by reference, its effect just originally just is included in herein in content of first to file as this.
The present invention relates generally to rfid system, more particularly, relate to the rfid system that comprises label with different memory sizes.
Radio-frequency (RF) identification (RFID) system is known, and has many purposes.For example, rfid system is used for inlet control uses, in this application, the employee uses RFID " vicinity " card or label to get permission to enter empowered zone, or label is screwed on the chassis of haulage truck or other type of vehicle, enter certain facility to allow them.As another example, can in using, animal identification use rfid system, and in this occasion, the label that will have nothing in common with each other is fixed on the ear of livestock, to identify each animal.In another example, in using, the container tracking uses rfid system, and in this occasion, the label that will have nothing in common with each other is fixed on the reusable container, so that their use of accurate recording.
In these and other was used, RFID label (being also referred to as " transponder " or " label ") generally sent a plurality of data blocks to the RFID reader.But, since application demand on difference, or in the label storage this memory of data structure difference, the quantity of the data block that sends in the label may be different with size.Difference in memory or the data structure comes from the data block of the varying number of transmission, or the not isotopic number in each data block.The different producers of the memory that uses in label or the label also are different reasons of memory construction of using in the label.Improvement of Manufacturing Technology is an Another reason.
But in existing rfid system, because this system does not have ability to read the label that sends any size or incremental data piece, thereby data generally are to communicate by letter with the fixed qty that particular system limits.Therefore, this system is subjected between the existing and commercial in the future available label product can not compatible restriction, and between their systems of producing not operability will use the whole cost increase of this system.Industrial standardization will help to address these problems.
Therefore, need one " method for synchronous that comprises the rfid system of label " with different memory sizes.
An object of the present invention is to provide a kind of can read because the rfid system of the data that the label with different memory sizes different big or small and that quantity causes of data block sends between label.
Another object of the present invention is that a kind of method for synchronous and device will be provided, with facility from having the RFID tag transmits and the reading of data of different memory sizes.
Can reach these and attached purpose by various aspects of the present invention, wherein, briefly say, one aspect of the present invention is a kind of method for synchronous that comprises the rfid system of the label with different memory sizes, comprise step: at first district of tag ram storage synchronization character, with second district's stored data bit and the sync bit, thereby synchronization character can not be appeared in data bit and the sync bit at tag ram.
In another aspect of this invention, a kind of method for synchronous that is used to comprise the rfid system of label with different memory sizes, comprise step: the synchronization character that on the RF signal, sends the serial modulation, with the data bit and the sync bit of transmission serial modulation on the RF signal, thereby synchronization character can not be appeared in data bit and the sync bit.
In one side more of the present invention, a kind of method for synchronous that is used to comprise the rfid system of label with different memory sizes, comprise step: receive the serial modulated RF signal, this RF signal storage synchronization character, thus the serial that repeats that data bit and sync bit make synchronization character can not occur in the content of the tag ram in data bit and the sync bit is modulated; A repetition of the synchronization character of serial modulation on the identification RF signal; With the data bit after the repetition of reading the synchronization character of following on RF signal serial modulation, up to the next one repetition of the synchronization character that receives serial modulation on the RF signal.
In still another aspect of the invention, a kind of RFID label that is used to comprise the rfid system of the label with different memory sizes comprises: tag ram, control circuit, and modulator circuit.Tag ram has the synchronization character that is stored in tag ram one end and is stored in the data bit and the sync bit of the remainder of tag ram, thereby makes synchronization character can not appear at the remainder of tag ram.Control circuit provides address and control signal to tag ram, so that read the content of tag ram.Modulator circuit produces the content serial modulated RF signal by tag ram.
In still another aspect of the invention, a kind of RFID reader that is used to comprise the rfid system of the label with different memory sizes comprises: receiver circuit and processor.Receiver circuit is coupled to a RF signal, thereby this RF signal is with making synchronization character can not appear at synchronization character in data bit and the sync bit through suitable tissue, the repetition serial modulation of data bit and sync bit.Processor is coupled to receiver circuit.Processor comprises the memory of having stored a program, and this program causes a repetition of processor identification synchronization character, and reads the data bit of following after a repetition of synchronization character, repeats up to the next one that receives synchronization character.
In still another aspect of the invention, a kind of rfid system that comprises the label with different memory sizes comprises: a plurality of labels and a RFID reader.A plurality of labels comprise tag ram separately, control circuit and modulator circuit.Tag ram has synchronization character that is stored in tag ram one end and data bit and the sync bit that is stored in the tag ram remainder, thereby synchronization character can not be appeared in data bit and the sync bit.Control circuit provides address and control signal to tag ram, so that read the content of tag ram.Modulator circuit produces the repetition serial modulated RF signal with the content of tag ram.On the other hand, the RFID reader comprises receiver circuit and processor.Receiver circuit is coupled to the RF signal, and processor.Processor comprises the memory of storing a program, this program makes a repetition of the synchronization character of serial modulation on the processor identification RF signal, and read the data bit of following after a repetition of synchronization character, repeat up to the next one that receives the synchronization character on the RF signal.
By below in conjunction with the explanation of accompanying drawing, can more be well understood to the attached purpose of various aspects of the present invention, feature and advantage to the preferred embodiments of the present invention.
Fig. 1 utilizes various aspects of the present invention, comprises the block diagram of the rfid system of the label with different memory sizes;
Fig. 2 utilizes various aspects of the present invention, comprises the example of the tag ram tissue of a 32-bit synchronization word;
Fig. 3 utilizes various aspects of the present invention, comprises the example of the tag ram tissue of a 24-bit synchronization word;
Fig. 4 utilizes various aspects of the present invention, comprises the example of the tag ram tissue of a 16-bit synchronization word;
Fig. 5 utilizes various aspects of the present invention, comprises the example of the tag ram tissue of a 9-bit synchronization word;
Fig. 6 utilizes various aspects of the present invention, comprises the example of the tag ram tissue of a 16-bit synchronization word that begins at the start address of tag ram;
Fig. 7 utilizes various aspects of the present invention, comprises an example at the tag ram tissue of the 16-bit synchronization word of the termination address end of tag ram;
Fig. 8 is first example of a prior art tag ram tissue;
Fig. 9 is second example of a prior art tag ram tissue;
Figure 10 is the 3rd example of a prior art tag ram tissue;
Figure 11 is the example of the repetition of any one content in the first, the second or the 3rd example of a prior art tag ram tissue;
Figure 12 utilizes various aspects of the present invention, is used to comprise the flow chart of method for synchronous of the rfid system of the label with different memory sizes.
Fig. 1 is a block diagram that comprises the rfid system 10 of the label with different memory sizes.Rfid system 10 comprises 20, one RFID readers 30 of a master computer and a plurality of RFID label 40-1 to 40-n with different memory sizes.RFID label 40-1 is the representative of RFID label 40-1 to 40-n, for purpose discussed below, suppose that RFID label 40-1 presses close to RFID reader 30, thereby its one or more antenna element 401 receives the exciter signal 301 that one or more antenna elements 302 of the correspondence by RFID reader 30 send.The divider chain 303 of RFID reader 30 produces exciter signal 301.
The exciter signal 301 that power circuit 402 rectifications on the RFID label 40-1 receive produces an internal power source voltage Vdd who is used for other circuit on the RFID label 40-1.If order or data are superimposed or be modulated on the carrier signal of exciter signal 301, power circuit 402 is sent to decoding circuit 403 with exciter signal 301.Decoding circuit 403 demodulation exciter signal 301, and carry out mould/number conversion, be provided to the order or the data of the digital form of control circuit 404 with generation.Power circuit 402 also is sent to a clock generator circuit 405 to exciter signal 301.
Control circuit 404 comprises an address counter (not shown), and address counter is in address increment to a tag ram 407.Control circuit 404 responsing excitation device signals 301 produce appropriate control signals, and information is repeatedly read with series form from tag ram 407 with exciter carrier signal speed.Then, information is provided to modulator circuit 406.Modulator circuit 406 is with information overlap or be modulated on the label carrier signal, to produce the repetition serial modulated RF signal 408 with tag ram 407 contents.In this preferred embodiment, RF signal 408 is to use through suitably organizing thereby make synchronization character can not appear at synchronization character in data bit and the sync bit, the repetition serial modulation of data bit and sync bit.The transmitting antenna 409 that is coupled to modulator circuit 406 sends to a reception antenna 304 on the RFID reader 30 with RF signal 408.
Because in order to be modulated to serially on the RF signal 408, the content of tag ram 407 repeats to read, if therefore RFID reader 30 does not have the knowledge of data structure in advance, may be difficult to or can not determine repeat pattern (that is the content of tag ram 407).For example, in Fig. 8, pattern " 0123456789ABCDE " is stored in first example of a prior art tag ram tissue; In Fig. 9, pattern " 56789ABCDE1234 " is stored in second example of a prior art tag ram tissue; In Figure 10, pattern " ABCDE0123456789 " is stored in the 3rd example of a prior art tag ram tissue.Problem is, when from the upper left corner, along every to the right, from last piece to piece down, and when finishing to read the information of tag ram 407 to the lower right corner, each of these patterns all produces identical repetition or circulation pattern as shown in figure 11.As another example, as being 1 all, all be 0, or in the 1 and 0 certain heavy complex pattern that alternately occurs, RFID reader 30 does not have prior data structure knowledge in fact can not determine the length of circulation pattern yet.
Therefore, one aspect of the present invention is to comprise that a start address at tag ram 407 begins, or the synchronization character that finishes at the termination address of tag ram 407, thereby make RFID reader 30 can suitably read the content of tag ram 407 from RF signal 408.In order to guarantee that synchronization character does not repeat on certain positional fault ground of other in circulation pattern, at the suitable bit location of the circulation pattern sync bit that intersperses.Therefore, RFID reader 30 can be by at first finding synchronization character, and the data of reading then behind the synchronization character occur up to next synchronization character, ignores simultaneously, shelters or peel off sync bit, determines circulation pattern.
With reference to figure 6, " 1000000000000001 " that the start address that synchronization character 52 is shown in tag ram 407 begins, be dispersed in the middle of the such data bit " X " of data bit 56 as synchronous hyte 54 such " 01 " the sync bit components among the 7th of memory construction, thereby synchronization character can not be appeared in data bit and the sync bit.Synchronization character and sync bit are also referred to as " system bits ", and data bit is also referred to as " user bit ".Between synchronization character and the one group of sync bit, or the continuous data position between each synchronous hyte is called " data word ", for example the data word 58 in second of tag ram 407.Fig. 7 shows another example of data structure, and wherein synchronization character finishes the termination address at tag ram 407.
In order to be easy to discern synchronization character, in advance synchronization character is defined as a kind of bit pattern, 0 of the maximum quantity in this bit pattern in the data structure content is clipped between two 1.In order to guarantee that synchronization character comprises 0 of the maximum quantity that is clipped between two 1, with " 01 " synchronously hyte periodically be inserted among the data bit, make the data bits between the adjacent synchronous hyte lack four (4), or more than four than the figure place in the synchronization character.As selection, it is right to replace " 01 " sync bit with the sync bit of independent " 1 ".In this case, the data bits between the adjacent synchronous hyte will lack three (3) than the figure place in the synchronization character, or more than three.
Although the quantity of the data bit between the adjacent synchronous hyte " 01 " can be lacked more than four than the figure place in the synchronization character, lack four but preferably the quantity of the data bit between the adjacent synchronous hyte is set at than the figure place in the synchronization character, thereby make in the data structure of data bit and have the figure place of maximum quantity to use.Follow this regulation, after RFID reader 30 identifies synchronization character, can easily determine the unit of sync bit, make RFID reader 30 more easily to shelter or to peel off sync bit reading when serial is modulated at data bit on the RF signal 408.
In addition, by following the regulation that synchronization character comprises whole first data block, as shown in Figure 2, RFID reader 30 also can easily be determined the data structure of tag ram 407.But this regulation may be inapplicable for the data structure of the piece that comprises relative lesser amt.In addition, short synchronization character as shown in Figure 3 can make the situation more data position that has in the tag ram 407 than having used whole first synchronization character available sometimes.But as shown in Figures 4 and 5, situation is always not such.
In a word, by the synchronization character and the sync bit of the known regulation of storage in memory 407, RFID reader 30 can easily be determined storage interior perhaps repeat pattern thereon from the information on the RF signal 408 that is modulated at reception.The realization of RFID reader 30 is simple, and is known for being familiar with those of ordinary skill in the art.
Figure 12 shows the flow chart of the method for synchronous of the rfid system 10 that is used to comprise the label 40-1 to 40-n with different memory sizes.First step 1201 comprises, a synchronization character is stored in the step in first district of tag ram.This first district is the continuous bit location that begins of as shown in Figure 6 the start address at tag ram preferably.In this case, the step of storage synchronization character is included in the step of storage synchronization character in the continuous bit location that the start address of described tag ram begins.As selection, first district can be the continuous bit location that the termination address at tag ram as shown in Figure 7 finishes.In this case, the step of storage synchronization character is included in the step of storage synchronization character in the continuous bit location that the termination address of described tag ram finishes.Because synchronization character preferably predefine is a kind of bit pattern, 0 of maximum quantity in this pattern in the data structure content of tag ram is clipped between two 1, therefore, the step of storage synchronization character comprises step: store first binary condition one, store a plurality of position of second binary condition and store a position of described first binary condition.The storage of synchronization character is preferably carried out by programming to tag ram with habitual method and apparatus after making.But the storage of synchronization character can be chosen in the manufacture process of tag ram or label and carry out with habitual method and apparatus, and this has identical effect.
Second step 1202 is included in stored data bit and sync bit in second district of described tag ram, thereby makes described synchronization character can not appear at step in described data bit and the described sync bit.Second district is the remaining area of the tag ram after having stored synchronization character in the tag ram.Generally speaking, sync bit is dispersed between the described data bit, makes described synchronization character can not appear in the described remaining area of described tag ram.More particularly, the step of stored data bit and sync bit comprises step: set of data bits is made into each all has the data word of lacking four data bits than the figure place of described synchronization character at least; Sync bit is organized at least one the synchronous hyte that each all has described first binary condition; With by described synchronous hyte of interleave and described data word described data word and described synchronous hyte are stored in the described tag ram.After being preferably in and making, the storage of data bit and sync bit carries out to the tag ram programming with habitual method and apparatus.But the storage of data bit and sync bit can be chosen in the manufacture process of tag ram or label and carry out with habitual method and apparatus, and this has identical effect.
Third step 1203 comprises that the transmission serial is modulated to the step of the synchronization character on the RF signal.The described step that sends described synchronization character preferably includes step: send of first binary condition; Send a plurality of positions of second binary condition; With send of described first binary condition.In order to carry out this step, control circuit 404 in the tag ram 407 produces appropriate control signals, so that information repeatedly reads from tag ram 407 in the mode of serial, and be provided to the modulator circuit 406 that produces with the content serial modulated RF signal 408 of tag ram 407.The transmitting antenna 409 that is coupled on the modulator circuit 406 sends RF signal 408.
The 4th step 1204 comprises that sending serial is modulated to data bit and sync bit on the described RF signal, makes described synchronization character can not appear at step in described data bit and the described sync bit.The described step that sends data bit and sync bit preferably includes step: transmission is organized into each and all has the data bit of lacking four data word at least than the figure place in the described synchronization character, with be organized into the sync bit that each all has at least one synchronous hyte of described first binary condition, thereby make described synchronous hyte and described data word interleave.In order to carry out this step, control circuit 404 in the tag ram 407 produces appropriate control signals, so that information repeats to read from tag ram 407 with series form, and be provided to the modulator circuit 406 that produces with the content serial modulated RF signal 408 of tag ram 407.The transmitting antenna 409 that is coupled to modulator circuit 406 sends RF signal 408.
Thereby comprising reception, the 5th step 1205 make described synchronization character can not appear at the step of repetition serial modulated RF signal of the content of the tag ram in described data bit and the described sync bit by suitably storing synchronization character, data bit and sync bit.In order to carry out this step, as described, receiver 305 is coupled to reception antenna 304, to receive and amplification RF signal 408 with reference to figure 1.
The 6th step 1206 comprises that the identification serial is modulated to the step of a repetition of the described synchronization character of described RF signal.The step of discerning a repetition of described synchronization character preferably includes finds that serial is modulated to the step of maximum length sequence of the position of described second binary condition on the described RF signal.Because synchronization character is organized into one of one first binary condition, a plurality of positions of second binary condition and of described first binary condition, thereby the feasible maximum length sequence that needs the discovery serial to be modulated to the position of second binary condition on the RF signal.In order to carry out this step, processor 307 comprises the memory (not shown) of the program of the habitual programmed method programming of usefulness of a storage, and this program stored makes the repetition of processor 307 by the described synchronization character of continuous position identification of the maximum quantity in discovery second binary condition.
The 7th step 1207 comprises that reading described serial is modulated to data bit after the described repetition of the described synchronization character on the described RF signal, is modulated to the step that the next one of the described synchronization character on the described RF signal repeats up to receiving serial.The described step of sense data position preferably includes step: (a) read the continuous data position of some, described quantity is lacked four than the figure place of described synchronization character; (b) read next bit after the continuous data position of described quantity; If (c) described next bit is described first binary condition, stop so, if or described next bit be described second binary condition, ignore described next bit back so one, and jump back to step (a).In order to carry out these steps, processor 307 comprises the memory (not shown) of the program of the habitual programmed method programming of usefulness of a storage, and this program causes processor 307 to carry out these steps.
An advantage of the invention is and a kind ofly can read the data that send from label, allow existing and compatible rfid system between the commercial available label product in the future with different memory sizes.Another advantage is a kind of can reading from the data of the label transmission with different memory sizes, allows to carry out operating and reducing between system the rfid system of the whole cost of this system.
Although understand specific embodiments of the present invention here in detail, should know and to carry out various modifications to preferred embodiment, and not depart from the scope of the present invention.Therefore, above-mentioned explanation does not limit the present invention who defines in the appended claims.
Claims (9)
1. RFID label that is used to comprise the rfid system of the label with different memory sizes comprises:
Tag ram, tag ram has the synchronization character of an end that is stored in described tag ram, with the data bit and the sync bit that are stored in the described tag ram remainder, thereby described synchronization character can not be appeared in the remainder of described tag ram
Control circuit, control circuit to described tag ram address and control signal are provided in case read described tag ram content and
Modulator circuit, modulator circuit produces the described content serial modulated RF signal with described tag ram.
2. RFID label according to claim 1, wherein said synchronization character comprise of first binary condition, a plurality of positions of second binary condition and of described first binary condition.
3. RFID label according to claim 2, wherein said sync bit is dispersed between the described data bit, thereby makes described synchronization character can not appear at the described remainder of described tag ram.
4. RFID label according to claim 3, wherein said data bit is organized into each and all has the data word of lacking four number of data bits than the figure place of described synchronization character, described sync bit is organized at least one the synchronous hyte that comprises described first binary condition, and with described synchronous hyte and described data word interleave.
5. RFID reader that is used to comprise the rfid system of the label with different memory sizes comprises:
Be coupled to the receiver circuit of RF signal, thus the RF signal be with suitable tissue make described synchronization character can not appear at synchronization character, data bit and sync bit in described data bit and the described sync bit repetition serial modulation and
Be coupled to the processor of described receiver circuit, described processor comprises the memory of a program of a storage, described program causes described processor to discern a repetition of described synchronization character, and the described repetition data bit afterwards of reading described synchronization character, repeat up to the next one that receives described synchronization character.
6. RFID reader according to claim 5, wherein each described synchronization character comprises of first binary condition, a plurality of positions of second binary condition and of described first binary condition.
7. RFID reader according to claim 6, wherein said data bit is organized into each and all has the data word of lacking four data bits than the figure place of described synchronization character, described sync bit is organized at least one synchronous hyte comprising described first binary condition and with described synchronous hyte and described data word interleave.
8. RFID reader according to claim 7, wherein said program cause described processor to discern a repetition of described synchronization character by the longest bit sequence of finding described second binary condition.
9. rfid system that comprises the label with different memory sizes comprises:
Each all comprises a plurality of labels of a tag ram, control circuit and modulator circuit, described tag ram has the synchronization character of an end that is stored in described tag ram, with data bit and the sync bit in the remainder that is stored in described tag ram, thereby described synchronization character can not be appeared in described data bit and the described sync bit, described control circuit provides address and control signal to described tag ram, so that read the content of described tag ram, with described modulator circuit produce with the repetition serial modulated RF signal of the described content of described tag ram and
The RFID reader that comprises receiver circuit and processor, described receiver circuit is coupled to described RF signal, comprise a memory of storing a program with described processor, this program causes described processor identification serial to be modulated to a repetition of the described synchronization character on the described RF signal, and the data bit of reading after the described repetition of described synchronization character repeats up to the next one that receives the described synchronization character on the described RF signal.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US7798798P | 1998-03-13 | 1998-03-13 | |
| US60/077,987 | 1998-03-13 | ||
| US25659199A | 1999-02-23 | 1999-02-23 | |
| US09/256,591 | 1999-02-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1313011A true CN1313011A (en) | 2001-09-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99803980A Pending CN1313011A (en) | 1998-03-13 | 1999-03-04 | Synchronization method for RFID system including tags having different memory sizes |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP1068738A4 (en) |
| JP (1) | JP2003532935A (en) |
| KR (1) | KR20010052206A (en) |
| CN (1) | CN1313011A (en) |
| AU (1) | AU2896699A (en) |
| BR (1) | BR9908714A (en) |
| CA (1) | CA2322152A1 (en) |
| IL (1) | IL137749A0 (en) |
| WO (1) | WO1999046940A1 (en) |
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1999
- 1999-03-04 JP JP2000536204A patent/JP2003532935A/en active Pending
- 1999-03-04 KR KR1020007010095A patent/KR20010052206A/en active IP Right Grant
- 1999-03-04 EP EP99909858A patent/EP1068738A4/en not_active Withdrawn
- 1999-03-04 IL IL13774999A patent/IL137749A0/en unknown
- 1999-03-04 CN CN99803980A patent/CN1313011A/en active Pending
- 1999-03-04 WO PCT/US1999/004860 patent/WO1999046940A1/en active IP Right Grant
- 1999-03-04 AU AU28966/99A patent/AU2896699A/en not_active Abandoned
- 1999-03-04 CA CA002322152A patent/CA2322152A1/en not_active Abandoned
- 1999-03-04 BR BR9908714-6A patent/BR9908714A/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1765138B (en) * | 2003-04-03 | 2010-06-16 | 诺基亚有限公司 | Network service apparatus, portable electronic equipment, system and method having agency action for networking service |
| CN1677429B (en) * | 2004-03-25 | 2010-07-21 | Atmel德国有限公司 | Method and apparatus for improving wireless data transmission |
| CN101361297B (en) * | 2006-02-20 | 2016-04-06 | 株式会社神户制钢所 | Information synchronization system |
| CN101169817B (en) * | 2006-10-27 | 2011-04-13 | 财团法人工业技术研究院 | Radio frequency identification label system and the label |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1068738A1 (en) | 2001-01-17 |
| WO1999046940A1 (en) | 1999-09-16 |
| AU2896699A (en) | 1999-09-27 |
| KR20010052206A (en) | 2001-06-25 |
| CA2322152A1 (en) | 1999-09-16 |
| EP1068738A4 (en) | 2002-07-03 |
| IL137749A0 (en) | 2001-10-31 |
| BR9908714A (en) | 2000-11-21 |
| JP2003532935A (en) | 2003-11-05 |
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