SE515391C2 - Identifieringsbricka och läsare med interferensskydd - Google Patents
Identifieringsbricka och läsare med interferensskyddInfo
- Publication number
- SE515391C2 SE515391C2 SE9904033A SE9904033A SE515391C2 SE 515391 C2 SE515391 C2 SE 515391C2 SE 9904033 A SE9904033 A SE 9904033A SE 9904033 A SE9904033 A SE 9904033A SE 515391 C2 SE515391 C2 SE 515391C2
- Authority
- SE
- Sweden
- Prior art keywords
- messages
- message
- reader
- tag
- checksum
- Prior art date
Links
Classifications
-
- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
Description
15 20 25 30 515 391 Även RFID-system kan arbeta med spread-spectrum teknik, och uppfinningen är därför även tillämplig för att minimera stör- ningar från dylika system, liksom för att undertrycka stör- ningar fràn varje annat system som ger störningar vilka är kortare än RFID-systemets identifieringsmeddelanden_ Ett problem med identifieringssystem enligt i dag känd teknik är att de är mycket känsliga för störningar från källor som avger signaler vid RFID-systemens nmttagarfrekvens, exempel- vis i det för många tillämpningar fritt upplàtna 2,45 GHz- s.k.
RFID-system med s.k. till till bandet. Exempel på störkällor innefattar Bluetooth- länkar, system enligt 802.11 standarden, nedlänk brickan för att aktivera och/eller för att överföra data (d.v.s. system som sänder korta mikrovàgspulser den), RFID-system med batterilösa brickor som kraftsätts fràn läsarens mikrovàgssändare via en pà något sätt modulerad mikrovàgssignal, radarstationer, mikrovàgsugnar, persondetek- torer för larm, automatiska dörröppnare, videoöverföringslän- kar m.m.
Den. här föreliggande uppfinningen avser en identifierings- utförd att och/eller bricka och -läsare arbetande i mikrovágsomràdet, undertrycka störningar fràn främst kommunikations- spreadspektrumteknik i form av och/eller identifieringssystem med s.k. eller s.k. “direct sequency”, ”frequency hopping" från varje annat system som utsänder ndkrovägssignaler vid fast eller hoppande frekvenser och där signalen nmdulerats, och där en från läsaren avgiven mikrovàgssignal mottages av brickan, moduleras med informationssidband på endera eller pà ömse sidor om denna och reflekterar dessa informationssidband tillbaks till läsaren utan att ny energi tillförs sagda sig- nal, där brickans datainnehàll innehåller redundans exempel- vis genom att brickans datameddelande innehåller en checksum- G \AnS0kn00\000l ZZSEJ: doc, 2001-04-24 10 15 20 25 30 515 391 ma för sagda data och där brickans meddelande oförändrat upprepas minst tvâ gànger i följd, och där brickans meddelan- de har längre tidsutsträckning än den förväntade störningen sä att endast en del av sagda meddelande kan bli stört och där läsaren ifall meddelandet vid dess checksumme/redundans- kontroll förefaller att vara stört genom jämförelse av minst tvà pà varandra följande meddelanden konstaterar vilka data- bitar som avviker mellan næddelandena, samt genom en efter att meddelandena mellanlagrats i läsaren genom prövning sub- stituerar dessa avvikande bitar mellan meddelandena till dess att checksumme/redundanskontrollen ger ett godkänt resultat och därmed registrerar meddelandet som varande korrekt.
Vidare utmärks uppfinningen av att skriv/läsenheten även kan vara av en typ som utsänder pulsade mikrovàgssignaler, att skriv/läsenheten i en speciell utföringsform varierar sin frekvens mellan olika värden, s.k. spreadspectrum teknik ge- nom frequency hopping, att den i en ytterligare utföringsform utför redundanskontrollen genom checksummeberäkning enligt CRC-metoden. och. av att endast meddelanden sonx inte klarar redundanstesten prövas genom substituering av störda delar i sina identifieringsmeddelanden.
Utföringsexempel Uppfinningen skall nu beskrivas med hjälp av ett utföringsex- empel, där Fig 1 visar ett RFID-system av s.k. backscattertyp, Fig 2 visar ett RFID-system i ett störande fält, Fig 3 visar tvà konsekutiva identifieringsmeddelanden, Fig 4 visar störningar fràn ett spread-spectrum RFDC-system Fig 5 visar hur störda meddelanden har rekonstruerats, och, G \Ans0kn0O\000l ZZSE uzdoc. 200l-04-24 10 15 20 25 30 515 391 Fig 6 visar en teknisk lösning för denna rekonstruktion.
Figur J. visar en avläsningsenhet 1 och. en identifierings- bricka 2 som stàr i förbindelse med varandra via en mikro- vàgssignal 3. Avläsningsenheten innehåller en mikovågsoscil- lator 4 vilken via antennen 5 belyser brickans antenn 14.
Brickans elektronikenhet 7 tar emot, kodar, modulerar och re- flekterar signalen fràn avläsningsenheten med information en- ligt det data som finns i brickans elektronikenhet, och ska- par därmed s.k. identifieringsmeddelanden 8 till avläsnings- enheten.
Datainnehàllet i dessa meddelanden kan vara förprogrammerade i brickan eller programmerbara exempelvis via mikrovàgor, via ett i figuren ej visat kontaktdon eller pà annat sätt.
Identifieringsmeddelandena 8 avges till en mottagarantenn 6 i avläsningsenheten. Mottagarantennen behöver dock inte nödvän- digtvis vara separerad från sändantennen 5 såsom för enkel- hets skull visats i figuren.
I en blandare 9 i avläsningsenheten 1 transponeras den från brickan emottagna mikrovàgssignalen fràn antennen 6 till bas- band genom blandning med en del av den i antennen 5 utsända signalen så att identifieringsmeddelandena 8 àterskapas och tillförs avläsningsenhetens datordel 10.
Brickans data och annan information kan därmed göras till- gänglig via kommunikationskanalen 13, exempelvis genom seri- ell kommunikation enligt någon gängse metod.
En viktig funktion i det hittills beskrivna systemet är dess redundanskontroll av identifieringsmeddelandena_ Skulle exem- G \Ansokn0O\OO0122SE.Ir.d0c, 200 I -04-24 10 15 20 25 30 515 391 pelvis identifieringsbrickan befinna sig nära sin räckvidds- gräns kommer dess signal till antennen 6 att endast margi- nellt överstiga systemets brusnivà, och vissa bitar i medde- landet bli felaktiga, d.v.s. att det äterskapade meddelandet i 8b ej fullt överensstämmer med det av brickan avgivna med- delandet i 8a.
Det vore mycket olyckligt om sådana fel rapporteras vidare till överordnade system. Således kan t.ex. ett automatiskt identifierat tåg i hög fart oavsiktligt växlas in. på ett stickspår, eller' en automatiskt men felaktigt identifierad parkeringskund oavsiktligt orsaka debitering av någon annan etc. Denna typ av fel kallas substitutionsfel och undviks ge- nom sagda redundanskontroll. Här skall endast en metod för redundanskontrollen omnämnas, checksummemetoden, även om ett flertal andra metoder kan tillämpas i samma syfte.
Checksummeberäkning går' ut på att meddelandet 8 inte bara innehåller de data ll som skall överföras utan även att mot- svarande information har kodats in i en checksumma 12, och vilken checksumma utifrån sagda data beräknats enligt någon formel exempelvis CRCl6 eller CRC32 och därpå programmerats in i brickan för att bifogas meddelandet.
Avläsningsenhetens datordel 10 kan Inn med hjälp av sagda formel, skilja riktiga meddelanden från felaktiga genom att jämföra datadelen ll med checksummedelen 12. Meddelanden där checksumma och data ej överensstämmer förkastas av datordelen 10 så att de ej kan rapporteras vidare i datakanalen 13 till substitutionsfel eli- överordnade system. Härigenom har s.k. minerats, d.v.s. sådana fel där felaktiga meddelanden rappor- teras som korrekta även om de skulle vara felaktiga exempel- G \Ansokn00\000l 22SE tr duc. 200l-04-24 10 15 20 25 30 515 391 vis genom att det distorderats av brus. Detta är känd teknik, som här beskrivits för tydliggörande av uppfinningen.
Figur 2 visar ett RFID-system av tidigare beskriven typ i närvaro av störningar, där 21 visar en RFDC-sändare som via mikrovàgor kommunicerar med en eller flera andra, i figuren ej visade, sändare. 21 kan dock utgöras av varje annan appa- rat som utsänder mikrovågor som kan orsaka störningar i kom- munikationen mellan bricka 1 och avläsningsenhet 2, även innefattande andra RFID-system.
För tydlighetens skull förutsätter dock det här visade utfö- ringsexemplet att sändaren 2 utgörs av en RFDC-sändare enligt den s.k. Bluetooth-standarden vid 2,45 GHz, närmare bestämt kommunicerande i det enligt CEPT och andra myndigheter upp- làtna frekvensbandet 2400-2480 MHz, vilket band även antagits som standard för datakommunikation enligt IEEE 802.11, samt att RFID-systemet arbetar vid det av CEPT för identifierings- system upplàtna frekvensbandet 2446-2454 MHz, det s.k. AVI- bandet.
Signalen 4 från brickan kommer nu att få konkurrens från sig- nalen 5 fràn RFDC-sändaren. Skulle brickan befinna sig vid räckviddsgränsen, t.ex. 10 meter frän avläsningsenheten kan det teoretiskt visas att störning från signalen 5 kan vara signifikant även om RFDC-sändaren 21 skulle befinna sig pà relativt stort avstånd, t.ex. 100 meter, från avläsningsenhe- ten. Denna uppfinning avser att göra RFID-systemet motstånds- kraftigt mot dessa störningar.
Figur 3 visar tvà pà varandra följande RFID-meddelanden, 31 och 32, med identiska datafält 33 och checksummefält 34.
Meddelandena är dock delvis störda, närmare bestämt i inter- G \Ansokn00\000 l ZZSEJr. dot. 2001-04-24 10 15 20 25 30 5-15 391 vallen 35 och 36. Exempelvis kan 35 representera 10 störda bitar av totalt 100 bitar i datafältet 33.
Figur 4 visar hur störningar enligt Figur 3 kan uppkomma. detta utföringsexempel arbeta i RFID-systemet förutsätts i RFID-bandet 41, ett band som t.ex. kan vara 8 MHz brett vid 2450 MHz. Identifieringsmeddelandena 31 och 32 överförs vid den frekvens i detta band som avläsningsenheten är inställd till, eller närmare bestämt nära invid denna frekvens pà en- dera eller ömse sidor om densamma i form av sidband med iden- tifieringsmeddelandets information. Givetvis kan RFID-sända- rens frekvens från tid till annan hoppa mellan olika frekven- s.k. men då detta ser i RFID-bandet, spread-spectrum teknik, inte påverkar principen för uppfinningen har figuren för enkelhets skull förutsatt att RFID-systemet arbetar vid en fast frekvens.
Avläsningsenhetens mottagare förutsätts vara optimerad för att på bästa sätt emottaga ovan nämnda informationssidband, d.v.s. att dess mottagarbandbredd endast är sà vid som krävs för att meddelandena pà optimalt sätt skall kunna överföras. skulle meddelandets Om bandbredden t.ex. skulle vara 100 kHz, dataöverföringshastighet vara av samma storleksordning.
RFDC-sändaren förutsätts i exemplet i Figur 4 arbeta enligt ”spread spectrum” - teknik med hoppande frekvens över ett band 44 som omsluter RFID-bandet, där frekvensen exempelvis hoppar mellan 80 olika kanaler över ett 80 MHz brett band.
RFDC-länken förutsätts överföra data med en relativt hög dataöverföringshastighet, t.ex. sådan att varje enskild kanal tar upp ett 1 MHz brett frekvensutrymme. RFDC-sändaren sänder G \AnsoknOO\OO0l22SE,lr doc, ZOOI-Ud-Zd 10 15 20 25 30 515 391 således hela tiden, men vid hoppande frekvenser enligt mönst- ret 45, 46, 47, 48 o.s.v.
Det störfall som nu inträffar, och som den här föreliggande uppfinningen skyddar emot, har visats i figur 4 där frekven- sen. hos RFDC-frekvensen. 47 kolliderar* med RFID-meddelandet 31.
Den tidigare beskrivna redundanskontrollen skulle utan upp- finningens hjälp förkasta meddelandet 31 som ett substitu- tionsfel, och även påföljande meddelande eftersom dess check- inte stämmer. summeberäkning RFID-länken blir sàledes helt blockerad av RFDC-länken.
Figur 5 visar ett prövningsförfarande enligt den här beskriv- na uppfinningen, och Figur 6 visar en anordning för detta förfarande.
De i figur 3 visade næddelandena 3l,och 32, ursprungligen innehållande identiska data 33 och checksumma 34 men där ett antal bitar 35 respektive 36 blivit störda enligt figur 4 resulterar i att båda meddelandena förkastas.
Med en processor 61, som inte bara utför ordinarie redundans- kontroll enligt vad som tidigare beskrivits, kan även avvi- kelser mellan på varandra följande meddelanden prövas mot varandra för att utröna eventuella skillnader meddelandena De inkommande, emellan. meddelandena läggs där- ej godkända, vid upp i en minnesbank 62 för successiv bearbetning i pro- cessorn 61.
Om nu exempelvis de störda meddelandena 31 och 32 bit för bit jämförs med varandra upptäcker processorn två osäkra områden G \Ansokn()0\O00|22Sl-I.tr.doc, 2001-04-24 15 20 25 30 515 391 51 och 52 där avvikelser förekommer. Likväl drar processorn slutsatsen att de tvà meddelandena. är lika efterson\ bàdas checksumma 34 är identisk. Ett störfall har således sannolikt inträffat.
Processorn 61 prövar då först, fallet 55, med att byta ut det i meddelande 31 avvikande omrâdet 52 mot det alternativa bit- eftersom det så förändrade medde- mönstret 36, men kommer då, landet 55 nu innehåller' fel såväl vid. 53 som 54, vid sin redundanskontroll att tolka meddelandet som felaktigt. fallet 56, med att byta ut det Därefter prövar processorn, avvikande området 51 mot nmtsvarande data i næddelande 32, och kommer då att finna att det så förändrade meddelandet 56 stämmer vid redundanskontrollen. Meddelandet blir godkänt.
Datordelen 10 kommer sàledes endast att emotta där störningar från olika källor, exempelvis RFDC-system av typen Bluetooth, är bortfiltrerade.
Processorn 61 kan inom ramen för denna uppfinning utföras pà ett antal olika sätt, t.ex. i form av en grindmatris, och be- höver ej innehålla programvara. För hantering av enkla stör- fall är en hàrdvarulösning snarast att föredra eftersom lös- ningen kan göras mycket snabb.
För det fall att störfallet är komplicerat kan processorn 61 utgöras av en signalprocessor med kraftfulla matematiska funktioner, då detta underlättar användningen av avancerade beräkningsalgoritmer för störundertryckningen. Fall kan t.ex. uppstå där meddelandet innehåller störning på flera ställen, där ett större antal meddelanden i följd är störda, där stör- ning även i checksumman behöver hanteras, o.s.v.
G \AnsoknO0\000122SE lndoc. 200l-04-24 10 15 20 25 515 391 10 Det här givna utföringsexemplet utgör sàledes endast en be- gränsad beskrivning av hur störningar kan filtreras bort och här har endast, med ett enkelt exempel, i utföringsexemplet en teknik illustrerats som filtrerar bort de störningar som kan förväntas dä ett RFID-system opereras i ett frekvensområ- vid det s.k. de där flera olika tillämpningar samsas, t.ex.
Scientific and Medical), ISM-bandet 2,45 GHz.
(Industrial, Vidare har i utföringsexemplet endast visats RFID-system där en omodulerad mikrovàgssignal sänds ut från avläsningsenhe- ten, vilket kan förekomma ifall brickan inneháller en stän- digt oscillerande krets för klockning av dess interna logik och dess till brickantennen anslutna moduleringskretsar.
I en annan utföringsform kan avläsningsenheten även användas för att aktivera brickan, t.ex. genom att utsända pulsade mikrovàgssignaler“ vilka detekteras av' kretsar i identifie- ringsbrickan och därmed exempelvis startar en där inbyggd oscillator för framklockning av data till de modulatorkretsar som finns i anslutning till brickans antenn.
I ytterligare en annan 'utföringsfornx kan avläsningsenheten utsända pulsade mikrovàgssignaler för att överföra data till brickan för lagring i ett däri inbyggt minne och/eller för funktion. därför dess Avläsningsenheten kallas att styra ibland även skriv/läsenhet.
G \Ansokn00\000l22SE rr dOC. ZOOI-Od-M
Claims (6)
1. l. Identifieringsbricka (2) och -läsare arbetande i mikro- utförd, att undertrycka störningar fràn främst och/eller s.k. vágsområdet, kommunikations- identifieringssystenx med spreadspektrumteknik i form av 'frequency hopping' eller s.k. 'direct sequency', och/eller fràn varje annat system som utsänder mikrovàgssignaler vid fast eller hoppande frekvenser och där en fràn läsaren (1) (2), informationssidband pà endera eller pà ömse och, där signalen. modulerats, avgiven mikrovägssignal mottages av' brickan moduleras med sidor om denna och reflekterar dessa informationssidband tillbaks till läsaren (l) utan att ny energi tillförs sagda signal, där brickans datainnehäll innehåller redundans exempelvis genom att brickans datameddelande innehåller en checksumma (12) för sagda data och där brickans meddelande oförändrat upprepas minst tvä gånger i följd, och där brickans (2) meddelande har längre tidsutsträckning än den förväntade störningen sà att endast en del av sagda meddelande kan bli stört, kännetecknad av att läsaren (1) ifall meddelandet vid dess checksumme/ redundanskontroll förefaller att vara stört genom jämförelse av' minst tvà pà varandra följande meddelanden konstaterar vilka databitar som avviker mellan meddelandena, samt genom en efter att meddelandena mellanlagrats i läsaren (1) genom prövning substituerar dessa avvikande bitar mellan meddelan- dena till dess att checksumme/redundanskontrollen ger ett godkänt resultat och därmed registrerar meddelandet som varande korrekt. kännetecknad av,
2. Anordning enligt krav 1, att prövningen när samtliga möjliga kombinationer prövats och resultatet fortfarande inte är korrekt prövningen fortsätter" med alla G '»Ansokn00\000 l ZZSE u' doc. 2001-04-24 15 515 391 12 möjliga kombinationer av datainnehàllet i påföljande medde- landen.
3. Anordning enligt något av tidigare krav, kännetecknad av att skriv/läsenheten (l) även utsänder pulsade mikrovàgssig- naler.
4. Anordning enligt något av tidigare krav, kännetecknad av (1) varierar sin frekvens mellan olika att skriv/làsenheten värden, s.k. spreadspectrum teknik genom frequency hopping.
5. Anordning enligt något av tidigare krav, kännetecknad av att redundanskontrollen sker genom checksummeberäkning enligt CRC-metoden.
6. Anordning enligt nàgot av tidigare krav, kännetecknad av att endast meddelanden som inte klarar redundanstesten prövas genom substituering av störda delar i sina identifieringsmed- delanden. G \Ansokn00\000l22SE lr doc, 200l-04-24
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9904033A SE515391C2 (sv) | 1999-11-08 | 1999-11-08 | Identifieringsbricka och läsare med interferensskydd |
DE60038388T DE60038388T2 (de) | 1999-11-08 | 2000-11-01 | Schutz vor interferenzen |
AT00980156T ATE389919T1 (de) | 1999-11-08 | 2000-11-01 | Schutz vor interferenzen |
CNB008167788A CN1170247C (zh) | 1999-11-08 | 2000-11-01 | 干扰保护 |
PCT/SE2000/002143 WO2001037202A1 (en) | 1999-11-08 | 2000-11-01 | Interference protection |
EP00980156A EP1234271B1 (en) | 1999-11-08 | 2000-11-01 | Interference protection |
AU17453/01A AU1745301A (en) | 1999-11-08 | 2000-11-01 | Interference protection |
US10/129,534 US7239657B1 (en) | 1999-11-08 | 2000-11-01 | Interference protection |
HK03105827A HK1053526A1 (en) | 1999-11-08 | 2003-08-14 | Interference protection. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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SE9904033A SE515391C2 (sv) | 1999-11-08 | 1999-11-08 | Identifieringsbricka och läsare med interferensskydd |
Publications (3)
Publication Number | Publication Date |
---|---|
SE9904033D0 SE9904033D0 (sv) | 1999-11-08 |
SE9904033L SE9904033L (sv) | 2001-05-09 |
SE515391C2 true SE515391C2 (sv) | 2001-07-23 |
Family
ID=20417639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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SE9904033A SE515391C2 (sv) | 1999-11-08 | 1999-11-08 | Identifieringsbricka och läsare med interferensskydd |
Country Status (9)
Country | Link |
---|---|
US (1) | US7239657B1 (sv) |
EP (1) | EP1234271B1 (sv) |
CN (1) | CN1170247C (sv) |
AT (1) | ATE389919T1 (sv) |
AU (1) | AU1745301A (sv) |
DE (1) | DE60038388T2 (sv) |
HK (1) | HK1053526A1 (sv) |
SE (1) | SE515391C2 (sv) |
WO (1) | WO2001037202A1 (sv) |
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-
1999
- 1999-11-08 SE SE9904033A patent/SE515391C2/sv not_active IP Right Cessation
-
2000
- 2000-11-01 AT AT00980156T patent/ATE389919T1/de not_active IP Right Cessation
- 2000-11-01 CN CNB008167788A patent/CN1170247C/zh not_active Expired - Fee Related
- 2000-11-01 US US10/129,534 patent/US7239657B1/en not_active Expired - Fee Related
- 2000-11-01 WO PCT/SE2000/002143 patent/WO2001037202A1/en active Application Filing
- 2000-11-01 AU AU17453/01A patent/AU1745301A/en not_active Abandoned
- 2000-11-01 DE DE60038388T patent/DE60038388T2/de not_active Expired - Lifetime
- 2000-11-01 EP EP00980156A patent/EP1234271B1/en not_active Expired - Lifetime
-
2003
- 2003-08-14 HK HK03105827A patent/HK1053526A1/xx not_active IP Right Cessation
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---|---|
CN1170247C (zh) | 2004-10-06 |
SE9904033L (sv) | 2001-05-09 |
EP1234271B1 (en) | 2008-03-19 |
CN1408100A (zh) | 2003-04-02 |
HK1053526A1 (en) | 2003-10-24 |
DE60038388T2 (de) | 2009-04-02 |
EP1234271A1 (en) | 2002-08-28 |
SE9904033D0 (sv) | 1999-11-08 |
WO2001037202A1 (en) | 2001-05-25 |
US7239657B1 (en) | 2007-07-03 |
ATE389919T1 (de) | 2008-04-15 |
AU1745301A (en) | 2001-05-30 |
DE60038388D1 (de) | 2008-04-30 |
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