EP2124209A1 - Method for increasing the range of radio access systems - Google Patents

Method for increasing the range of radio access systems Download PDF

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Publication number
EP2124209A1
EP2124209A1 EP08103759A EP08103759A EP2124209A1 EP 2124209 A1 EP2124209 A1 EP 2124209A1 EP 08103759 A EP08103759 A EP 08103759A EP 08103759 A EP08103759 A EP 08103759A EP 2124209 A1 EP2124209 A1 EP 2124209A1
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EP
European Patent Office
Prior art keywords
signals
signal
range
discarded
radio access
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EP08103759A
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German (de)
French (fr)
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EP2124209B1 (en
Inventor
Jörg Schrape
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Hella GmbH and Co KGaA
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Hella KGaA Huek and Co
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Priority to AT08103759T priority Critical patent/ATE519191T1/en
Priority to EP08103759A priority patent/EP2124209B1/en
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C25/00—Arrangements for preventing or correcting errors; Monitoring arrangements
    • G08C25/04—Arrangements for preventing or correcting errors; Monitoring arrangements by recording transmitted signals

Definitions

  • the invention relates to a method for increasing the range of radio access systems according to the preamble of claim 1.
  • Such radio access systems are used in particular in motor vehicles to trigger various functions such as opening / closing, locating the vehicle and / or auxiliary heating via a built-in key part in a remote control.
  • signals which each comprise a specific data stream are transmitted in certain radio bands, e.g. in the ISM bands 315 MHz, 433 MHz, 868 MHz or 915 MHz. At least some of the functions require a relatively long range.
  • a vehicle having at least two radio-based systems using a common vehicle-mounted receiver is known.
  • a bandwidth of the receiver is automatically dependent on vehicle condition data adjustable. This should ensure a different range depending on a function to be triggered.
  • the object of the invention is to provide a method for radio access systems that allows greater ranges with little hardware overhead, even for larger data streams.
  • Discarded signals are buffered, and after every odd number of discarded signals, a bitwise majority decision followed by validation is performed. Here, the odd number is greater than two. Using the cached discarded signals and the bitwise majority decision from the signals corrected signals are determined. These are more likely to contain correct data than any single signal, so that the desired function is more likely to be performed correctly.
  • the bitwise majority decision is made as follows: For each bit of the discarded signals, the corresponding bits are compared. If a value of a majority of corresponding bits - eg at least three bits on five signals - is identical, this value is used as the corrected value and used in the signal to be rebuilt. In this simple way, erroneous and therefore discarded signals are quickly and safely corrected to valid signals; the The probability that corresponding bits are mostly different is low. This correction will be performed as long after the receipt of further signals (three points in the FIG. 1 ) until a valid signal has been generated or received.
  • the majority decision is inserted in the normal process of receiving the data. As a result, the normal processes remain unaffected, so that no changes must be made here.
  • the rejected signals are buffered until a valid signal has been generated or another termination criterion is met. Therefore, little storage capacity is required.
  • the start 1 is triggered by the operation of a corresponding button on a transmitting part.
  • the transmitting section transmits a modulated and coded signal consisting of an associated predetermined number of bits.
  • the signal is received by a receiving part, which is eg arranged in a motor vehicle, 2 and tested for validity 3. If the received signal 2 is valid Y, the corresponding function 5 is triggered. If the received signal 2 is invalid N, it is discarded and buffered. A second signal is received 2 and checked for validity 3. If the second received signal 2 is also invalid N, it is buffered. A third signal 2 is received and checked for validity 3. If the third received signal 2 is again invalid N, it is buffered.
  • a bitwise majority decision 4 is performed and a corrected signal is calculated.
  • the corrected signal is checked for validity 3; if it is valid, the corresponding function 5 is triggered and the stored signals are deleted; if it is invalid, receiving 2 will be repeated, checking validity 3, discard, caching and bitwise majority decision 4 on each odd number of received signals 2 until a valid signal is received or calculated.
  • the allowable bit error rate at the receiver output may increase from about 0.001 to 0.05 by the bitwise majority decision on five received signals. This increases the sensitivity of a known receiver by about 3 dB. This leads to a higher range in the system remote control - receiver in the vehicle.

Abstract

The method involves exchanging data in the form of modulated signals in a high frequency range between a base station and a remote control. The signals are checked for validation (3) and are rejected if necessary. The rejected signals are buffered (4) and that a majority decision is carried out bit by bit with the subsequent validity checking for each odd number of the rejected signal, till a valid signal is generated or received.

Description

Die Erfindung betrifft ein Verfahren zur Erhöhung der Reichweite von Funkzugangssystemen gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for increasing the range of radio access systems according to the preamble of claim 1.

Solche Funkzugangssystemen werden insbesondere bei Kraftfahrzeugen eingesetzt, um über eine in einem Schlüsselteil eingebaute Fernbedienung verschiedene Funktionen wie Öffnen/Schließen, Auffinden des Fahrzeugs und/oder Standheizung auszulösen. Hierfür werden Signale, die jeweils einen bestimmten Datenstrom umfassen, in bestimmten Funkbändern übertragen, z.B. in den ISM- Bändern 315 MHz, 433 MHz, 868 MHz oder 915 MHz. Zumindest für einen Teil der Funktionen wird eine relativ große Reichweite gefordert.Such radio access systems are used in particular in motor vehicles to trigger various functions such as opening / closing, locating the vehicle and / or auxiliary heating via a built-in key part in a remote control. For this purpose, signals which each comprise a specific data stream are transmitted in certain radio bands, e.g. in the ISM bands 315 MHz, 433 MHz, 868 MHz or 915 MHz. At least some of the functions require a relatively long range.

Um bei großen Datenströmen kurze Reaktionszeiten zu erzielen, werden hohe Übertragungsraten von z.B. 20 kBit/s oder höher eingesetzt. Dies hat den Nachteil, dass der Empfänger eine geringere Empfindlichkeit aufweist, was mit einer geringen Reichweite einhergeht. Bei höheren geforderten Reichweiten werden nur geringere Übertragungsraten eingesetzt, um eine höhere Empfängerempfindlichkeit nutzen zu können. Befindet sich die Fernbedienung an der Grenze der Reichweite, steigt die Wahrscheinlichkeit von Fehlern beim Empfang des übertragenen Datenstroms. Ein einziger Bit- Fehler führt zu einem ungültigen Signal und damit zu einem Nichtauslösen der gewünschten Funktion.To achieve short response times for large data streams, high transmission rates of e.g. 20 kBit / s or higher. This has the disadvantage that the receiver has a lower sensitivity, which is associated with a short range. At higher required ranges, only lower transmission rates are used in order to be able to use a higher receiver sensitivity. If the remote control is at the limit of range, the likelihood of errors in receiving the transmitted data stream increases. A single bit error leads to an invalid signal and thus to a non-triggering of the desired function.

In dem Artikel von Tom Tang: RKE - opening more than doors; in: Wards Auto Electronics 03/2005, S. 34 - 39 ist die Problematik zur Erzielung höherer Reichweiten allgemein beschrieben. Eine konkrete Lösung zur Erhöhung einer Empfindlichkeit eines Empfängers ist nicht angegeben.In the article of Tom Tang: RKE - opening more than doors; in: Wards Auto Electronics 03/2005, p. 34 - 39 the problem of achieving higher ranges is generally described. A concrete solution for increasing a sensitivity of a receiver is not specified.

Aus der DE 10 2006 009 899 A1 ist ein Fahrzeug mit mindestens zwei funkbasierten Systemen bekannt, die einen gemeinsamen fahrzeuggebundenen Empfänger verwenden. Eine Bandbreite des Empfängers ist automatisch in Abhängigkeit von Fahrzeugzustandsdaten einstellbar. Hierdurch soll eine unterschiedliche Reichweite in Abhängigkeit von einer auszulösenden Funktion gewährleistet sein.From the DE 10 2006 009 899 A1 For example, a vehicle having at least two radio-based systems using a common vehicle-mounted receiver is known. A bandwidth of the receiver is automatically dependent on vehicle condition data adjustable. This should ensure a different range depending on a function to be triggered.

Für die Datenübertragung ist es bekannt, Verfahren zur Fehlererkennung und -Korrektur einzusetzen. Diese werden für die Fernbedienung von Fahrzeugen nicht angewendet, weil sie relativ hochwertige und somit teure Mikrocontroller erfordern. Für die Datenübertragung zur Fernbedienung von Fahrzeugen ist es üblich, Signale mehrfach hintereinander zu senden, damit die Wahrscheinlichkeit des Empfangs eines fehlerfreien Signals erhöht wird.For data transmission, it is known to use methods for error detection and correction. These are not used for remote control of vehicles because they require relatively high-quality and therefore expensive microcontrollers. For data transmission for remote control of vehicles, it is common to send signals in succession, in order to increase the probability of receiving an error-free signal.

Mit den bekannten Funksystemen und -verfahren ist ein relativ hoher Aufwand für die erforderliche Hardware verbunden, wenn auch größere Datenströme über große Distanzen sicher übertragen werden sollen.With the known radio systems and methods, a relatively high effort for the required hardware is connected, even if larger data streams over long distances to be transmitted securely.

Aufgabe der Erfindung ist es, ein Verfahren für Funkzugangssysteme zu schaffen, dass mit geringem Hardware- Aufwand größere Reichweiten auch für größere Datenströme erlaubt.The object of the invention is to provide a method for radio access systems that allows greater ranges with little hardware overhead, even for larger data streams.

Die Aufgabe ist durch die Merkmale des Anspruchs 1 gelöst. Verworfene Signale werden zwischengespeichert und nach jeder ungeraden Anzahl aller verworfenen Signale wird eine bitweise Mehrheitsentscheidung mit anschließender Gültigkeitsprüfung durchgeführt. Hierbei ist die ungerade Anzahl größer als zwei. Mit Hilfe der zwischengespeicherten verworfenen Signale und der bitweisen Mehrheitsentscheidung aus den Signalen werden korrigierte Signale ermittelt. Diese enthalten mit einer höheren Wahrscheinlichkeit korrekte Daten als jedes einzelne Signal, so dass die gewünschte Funktion mit höherer Wahrscheinlichkeit korrekt ausgeführt wird.The object is solved by the features of claim 1. Discarded signals are buffered, and after every odd number of discarded signals, a bitwise majority decision followed by validation is performed. Here, the odd number is greater than two. Using the cached discarded signals and the bitwise majority decision from the signals corrected signals are determined. These are more likely to contain correct data than any single signal, so that the desired function is more likely to be performed correctly.

Die bitweise Mehrheitsentscheidung wird wie folgt durchgeführt: Für jedes Bit der verworfenen Signale werden die korrespondierenden Bits verglichen. Wenn ein Wert einer Mehrheit von korrespondierenden Bits - z.B. mindestens drei Bits bei fünf Signalen - identisch ist, wird dieser Wert als korrigierter Wert genutzt und in dem neu zu bildenden Signal verwendet. Auf diese einfache Weise werden fehlerhafte und deswegen verworfene Signale schnell und sicher zu gültigen Signalen korrigiert; die Wahrscheinlichkeit, dass korrespondierende Bits mehrheitlich unterschiedlich sind, ist gering. Diese Korrektur wird so lange nach dem Empfang weiterer Signale durchgeführt (drei Punkte in der Figur 1), bis ein gültiges Signal erzeugt oder empfangen worden ist.The bitwise majority decision is made as follows: For each bit of the discarded signals, the corresponding bits are compared. If a value of a majority of corresponding bits - eg at least three bits on five signals - is identical, this value is used as the corrected value and used in the signal to be rebuilt. In this simple way, erroneous and therefore discarded signals are quickly and safely corrected to valid signals; the The probability that corresponding bits are mostly different is low. This correction will be performed as long after the receipt of further signals (three points in the FIG. 1 ) until a valid signal has been generated or received.

In einer bevorzugten Ausführungsform wird die Mehrheitsentscheidung in den normalen Ablauf des Empfangs der Daten eingefügt. Hierdurch bleiben die normalen Abläufe unbeeinflusst, so dass hier keine Änderungen durchgeführt werden müssen.In a preferred embodiment, the majority decision is inserted in the normal process of receiving the data. As a result, the normal processes remain unaffected, so that no changes must be made here.

In einer weiteren Variante werden die verworfenen Signale so lange zwischengespeichert, bis ein gültiges Signal erzeugt wurde oder ein anderes Abbruchkriterium erfüllt ist. Daher ist nur wenig Speicherkapazität erforderlich.In another variant, the rejected signals are buffered until a valid signal has been generated or another termination criterion is met. Therefore, little storage capacity is required.

Anhand der beigefügten Zeichnungen wird die Erfindung nachfolgend näher erläutert. Dabei zeigt:

Fig. 1
ein Ablaufschema des Verfahrens.
Reference to the accompanying drawings, the invention is explained in more detail below. Showing:
Fig. 1
a flow chart of the process.

Der Ablauf des erfindungsgemäßen Verfahrens ist aus der Figur 1 ersichtlich: Der Start 1 wird durch das Bedienen einer entsprechenden Taste an einem Sendeteil ausgelöst. Das Sendeteil sendet ein moduliertes und codiertes Signal, das aus einer zugehörigen bestimmten Anzahl von Bits besteht. Das Signal wird von einem Empfangsteil, das z.B. in einem Kraftfahrzeug angeordnet ist, empfangen 2 und auf Gültigkeit 3 geprüft. Wenn das empfangene Signal 2 gültig Y ist, wird die entsprechende Funktion 5 ausgelöst. Ist das empfangene Signal 2 ungültig N, wird es verworfen und zwischengespeichert. Ein zweites Signal wird empfangen 2 und auf Gültigkeit 3 geprüft. Ist auch das zweite empfangene Signal 2 ungültig N, wird es zwischengespeichert. Ein drittes Signal 2 wird empfangen und auf Gültigkeit 3 geprüft. Ist das dritte empfangene Signal 2 wiederum ungültig N, wird es zwischengespeichert. Mit Hilfe der zwischengespeicherten Signale wird eine bitweise Mehrheitsentscheidung 4 durchgeführt und ein korrigiertes Signal berechnet. Das korrigierte Signal wird auf Gültigkeit 3 geprüft; ist es gültig, wird die entsprechende Funktion 5 ausgelöst und die gespeicherten Signale werden gelöscht; ist es ungültig, wiederholt sich das Empfangen 2, das Prüfen auf Gültigkeit 3, das Verwerfen, das Zwischenspeichern und die bitweise Mehrheitsentscheidung 4 bei jeder ungeraden Anzahl der empfangenen Signale 2, bis ein gültiges Signal empfangen oder berechnet worden ist.The course of the method according to the invention is known from FIG. 1 can be seen: The start 1 is triggered by the operation of a corresponding button on a transmitting part. The transmitting section transmits a modulated and coded signal consisting of an associated predetermined number of bits. The signal is received by a receiving part, which is eg arranged in a motor vehicle, 2 and tested for validity 3. If the received signal 2 is valid Y, the corresponding function 5 is triggered. If the received signal 2 is invalid N, it is discarded and buffered. A second signal is received 2 and checked for validity 3. If the second received signal 2 is also invalid N, it is buffered. A third signal 2 is received and checked for validity 3. If the third received signal 2 is again invalid N, it is buffered. With the aid of the buffered signals, a bitwise majority decision 4 is performed and a corrected signal is calculated. The corrected signal is checked for validity 3; if it is valid, the corresponding function 5 is triggered and the stored signals are deleted; if it is invalid, receiving 2 will be repeated, checking validity 3, discard, caching and bitwise majority decision 4 on each odd number of received signals 2 until a valid signal is received or calculated.

Bei einer zulässigen Fehlerrate der Funktion 5 von etwa 10% und einer angenommenen Signallänge von 96 Bit darf die zulässige Bitfehlerrate am Empfängerausgang durch die bitweise Mehrheitsentscheidung bei fünf empfangenen Signalen von etwa 0,001 auf 0,05 steigen. Dadurch erhöht sich die Empfindlichkeit eines bekannten Empfängers um etwa 3 dB. Dies führt zu einer höheren Reichweite im System Fernbedienung - Empfänger im Fahrzeug.With an allowable error rate of the function 5 of about 10% and an assumed signal length of 96 bits, the allowable bit error rate at the receiver output may increase from about 0.001 to 0.05 by the bitwise majority decision on five received signals. This increases the sensitivity of a known receiver by about 3 dB. This leads to a higher range in the system remote control - receiver in the vehicle.

Alternativ können bei gleichen Anforderungen an die Reichweite elektronische Bauteile wie z.B. rauscharme Vorverstärker entsprechend eingespart werden.Alternatively, for equal range requirements, electronic components such as e.g. Low-noise preamplifier be saved accordingly.

Claims (3)

Verfahren zur Erhöhung der Reichweite von Funkzugangssystemen,
wobei Daten in Form von modulierten Signalen in einem Hochfrequenz- Bereich zwischen einer Basisstation und einer Fernbedienung ausgetauscht werden
und wobei die Signale auf Gültigkeit überprüft und gegebenenfalls verworfen
werden,
dadurch gekennzeichnet, dass verworfene Signale zwischengespeichert werden und
dass nach jeder ungeraden Anzahl der verworfenen Signale eine bitweise Mehrheitsentscheidung mit anschließender Gültigkeitsprüfung durchgeführt wird, bis ein gültiges Signal erzeugt oder empfangen worden ist.Method for increasing the range of radio access systems,
wherein data is exchanged in the form of modulated signals in a high frequency range between a base station and a remote control
and wherein the signals are checked for validity and possibly discarded
become,
characterized in that discarded signals are cached and
that after every odd number of discarded signals, a bitwise majority decision followed by a validation is performed until a valid signal has been generated or received. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Mehrheitsentscheidung in den normalen Ablauf des Empfangs der Daten eingefügt wird.A method according to claim 1, characterized in that the majority decision is inserted in the normal course of the reception of the data. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die verworfenen Signale so lange zwischengespeichert werden, bis ein gültiges Signal erzeugt wurde.A method according to claim 1 or 2, characterized in that the discarded signals are buffered until a valid signal has been generated.
EP08103759A 2008-04-29 2008-04-29 Method for increasing the range of radio access systems Not-in-force EP2124209B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT08103759T ATE519191T1 (en) 2008-04-29 2008-04-29 METHOD FOR INCREASE THE RANGE OF RADIO ACCESS SYSTEMS
EP08103759A EP2124209B1 (en) 2008-04-29 2008-04-29 Method for increasing the range of radio access systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08103759A EP2124209B1 (en) 2008-04-29 2008-04-29 Method for increasing the range of radio access systems

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EP2124209A1 true EP2124209A1 (en) 2009-11-25
EP2124209B1 EP2124209B1 (en) 2011-08-03

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6097520A (en) * 1997-06-30 2000-08-01 Microsoft Corporation Remote control receiver and method of operation
DE69728617T2 (en) * 1996-09-27 2005-04-21 Valeo Securite Habitacle Sas Radio remote controls with two ranges for a motor vehicle
DE102006009899A1 (en) 2006-03-03 2007-09-06 Hella Kgaa Hueck & Co. Motor vehicle with two or more radio-controlled remote functions, e.g. entry/go or parking heating, has a single receiver switching the bandwidths automatically according to the operation on demand

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69728617T2 (en) * 1996-09-27 2005-04-21 Valeo Securite Habitacle Sas Radio remote controls with two ranges for a motor vehicle
US6097520A (en) * 1997-06-30 2000-08-01 Microsoft Corporation Remote control receiver and method of operation
DE102006009899A1 (en) 2006-03-03 2007-09-06 Hella Kgaa Hueck & Co. Motor vehicle with two or more radio-controlled remote functions, e.g. entry/go or parking heating, has a single receiver switching the bandwidths automatically according to the operation on demand

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
TOM TANG: "RKE - OPENING MORE THAN DOORS", WARD'S AUTO ELECTRONICS, 1 March 2005 (2005-03-01), pages 34 - 39, XP002549653 *
WARDS AUTO ELECTRONICS, March 2005 (2005-03-01), pages 34 - 39

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EP2124209B1 (en) 2011-08-03
ATE519191T1 (en) 2011-08-15

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