EP0347355B1 - Synchronisierter multi-thematischer Informationen-Rundfunk, der eine über einen Sendepark rekonfigurierbare Hörstrategie von Radioprogrammen erlaubt - Google Patents

Synchronisierter multi-thematischer Informationen-Rundfunk, der eine über einen Sendepark rekonfigurierbare Hörstrategie von Radioprogrammen erlaubt Download PDF

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Publication number
EP0347355B1
EP0347355B1 EP19890460017 EP89460017A EP0347355B1 EP 0347355 B1 EP0347355 B1 EP 0347355B1 EP 19890460017 EP19890460017 EP 19890460017 EP 89460017 A EP89460017 A EP 89460017A EP 0347355 B1 EP0347355 B1 EP 0347355B1
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EP
European Patent Office
Prior art keywords
marker
transmitter
cycle
transmitters
messages
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19890460017
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English (en)
French (fr)
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EP0347355A1 (de
Inventor
Denis Renault
Jean-Pierre Bauduin
Pascal Leray
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telediffusion de France ets Public de Diffusion
Orange SA
Original Assignee
Telediffusion de France ets Public de Diffusion
France Telecom SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP0347355A1 publication Critical patent/EP0347355A1/de
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/26—Arrangements for switching distribution systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/091—Traffic information broadcasting
    • G08G1/094—Hardware aspects; Signal processing or signal properties, e.g. frequency bands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/25—Arrangements for updating broadcast information or broadcast-related information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/55—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for traffic information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/13—Aspects of broadcast communication characterised by the type of broadcast system radio data system/radio broadcast data system [RDS/RBDS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/68—Systems specially adapted for using specific information, e.g. geographical or meteorological information
    • H04H60/71—Systems specially adapted for using specific information, e.g. geographical or meteorological information using meteorological information

Definitions

  • the field of the invention is that of the dissemination of information messages by a fleet of radio transmitters with distributed transmission frequencies, intended for fixed or mobile receivers.
  • the invention was more particularly developed for the design of a multi-thematic information system intended for mobile receivers, and more particularly for motorists.
  • the method of synchronized broadcasting of a fleet of radio transmitters can be applied in all situations where it is desired allow a single receiver to listen, in an optimized manner, to several transmitters broadcasting regularly updated information messages.
  • the optimization sought of course consists of allowing the receiver to receive as quickly as possible each update occurring on one of the radio transmitters in the park.
  • the RDS system is known, described in particular in the document NTZ-NACHRICHTENTECHNISCHE ZEITSCHRIFT, vol 40, n °. 5, May 1987, pages 346-348 and 350-351, which is implemented on the basis of sound broadcasting networks in frequency modulation (FM).
  • FM frequency modulation
  • This service was developed because of the problems posed by the short range of FM transmitters, and therefore the need to set up a network of transmitters with distributed frequencies to offer a service with large coverage.
  • This technique makes it possible to receive, from all points of the geographical area covered, a given broadcast service, provided that the receiver is tuned to the frequency of the corresponding local transmitter.
  • the RDS system has endeavored to solve this problem by offering an automatic tuning function.
  • the principle consists in putting, on a digital subcarrier added to the basic sound signal, information frames containing in particular the list of so-called alternative frequencies, schematically corresponding to the central frequencies of the surrounding transmitters which broadcast the same program.
  • the receiver therefore acquires the list of alternative frequencies, scans these frequencies and decides according to a tactic of its own, to select the best at all times.
  • This known system does indeed optimize the listening quality of a given transmitter, but does not allow optimized listening to several transmitters.
  • the objective of the invention is to allow a strategy for listening to several transmitters.
  • the objective is to provide a system adapted to the reception of regularly updated information messages, broadcast by a fleet of thematic transmitters with distributed frequencies.
  • each transmitter continuously broadcasts a cycle formed by a variable number of messages, each cycle of messages being divided into successive blocks of fixed size and duration and identical for all the transmitters, in that each block includes a marker initial informative, said state marker, and each cycle includes an initial informative marker, said synchronizing marker, and in that the cycle starts of each transmitter in the fleet are shifted from one transmitter to another, so that the markers of each transmitter are broadcast at different times from the other transmitters so that they can be picked up successively by the same receiver .
  • each marker comprises on the one hand a version number of the current cycle of the corresponding transmitter, and on the other hand information on the number of blocks to be broadcast before the next synchronizing marker, it i.e. before the start of the next cycle.
  • each synchronizing and / or status marker includes information on the number of new messages in the current version of the broadcast cycle, compared to the previous version.
  • each state marker includes information on the number of new messages in the current version of the corresponding block, compared with the previous version of said block.
  • said new messages are broadcast immediately after the broadcast of the synchronizing marker of the current cycle of the status marker of the current block respectively.
  • the fixed duration of a message block is between 40 and 150 times approximately the duration of transmission of a marker.
  • the preferred embodiment described below relates to the transmission of information messages, intended for motorists. These messages are broadcast by a fleet of transmitters, each transmitter being specialized on a given theme (meteorology, road traffic, "paging" or calling people, availability of urban car parks, etc.).
  • Each of these messages is put on the principle of transmitting information of deviation, compared to an agreed state of equilibrium, and known to the receiver.
  • the messages broadcast are "commands" addressed to on-board computers.
  • Each on-board terminal includes processing capacity and an on-board database.
  • the on-board database is advantageously a cartographic base constituted by a set of objects; a set of attributes is attached to each object.
  • Objects when they are of a cartographic nature, can be addressed by a message field generally called "location";
  • a typical object is a road segment, a section of road framed by two crossroads;
  • the attributes of this object are for example: the length of the segment, the category and the name of the road axis to which it belongs, the number of lanes, the direction of traffic, the fluidity, etc ... certain attributes are very static (for example the length), others are dynamic (for example the fluidity).
  • the messages can either be messages of fixed length (of the type of messages proposed by the ECMT: European Conference of Ministers of Transport), or of variable length.
  • a message cycle consists of a succession of messages M1, M2, ... Mn. From one cycle to another, the number n and the content of the messages can be modified.
  • marker message 11 which identifies the start of the cycle and the version number of the cycle; later when the cycle is modified following the introduction of new messages, the version number is modified following the introduction of new messages, the version number is modified and the number of new messages indicated.
  • This marker message 11 is therefore an initial informative marker of the cycle, which will be called a synchronizing marker.
  • a synchronizing marker As shown on the time axis of Figure 1, its occurrences 12, 13, 14 of diffusion occur at regular intervals, owing to the fact that the diffusion of the cycle is carried out repeatedly.
  • the time period separating two successive broadcasts (12, 13; 13, 14) of the synchronizing marker 11 can be variable, because the number of messages 10 in the cycle is variable.
  • FIG. 2 illustrates the principle of synchronization between different transmitters 21, 22, 23.
  • Each of the transmitters carries a message transmission cycle E1, E2, E3, as shown in FIG. 2a.
  • a synchronizing marker 24, 25, 26 is broadcast at the start of each cycle of the transmitters 21, 22, 23 respectively.
  • the synchronization of the transmitters consists in broadcasting synchronizing markers 24, 25, 26 of the transmitters at different times, so that they can be received successively by the same receiver, which locks successively on each of the transmission frequencies of the transmitters 21, then 22, finally 23.
  • the offset of the synchronizing markers 24, 25, 26 is a necessary condition, but not sufficient, to allow a reconfigurable listening strategy according to the invention. Indeed, it has been noted that each of the transmitters' cycles can comprise a variable number of messages, the offset between the times of transmission of the markers 24, 25, 26, must nevertheless remain distinct whatever the size of the cycles E1, E2 , E3 correspondents.
  • Each time unit corresponds to the transmission of an information block. This means that the messages M1, M2 ... Mn of a cycle are previously cut out, or grouped together, so as to successively fill each of the transmission blocks with a constant time unit.
  • this status marker indicates in particular the number of blocks that remain to be broadcast. to meet the cycle synchronizing marker again, as well as a version number of the current cycle.
  • the times at which each transmitter broadcasts its status markers are slightly offset, and allow the same HF head of a given receiving terminal to "jump from one to the other".
  • the period of time u separating any two markers, for the same transmitter is identical whatever the transmitter.
  • the offset T between two consecutive markers, from one transmitter to another is such that, if on examining the 28m marker the receiver decides to take an interest in the transmitter 3, it has enough time to agree on the frequency of the transmitter 3 and possibly synchronize its decoder before the broadcast of the marker 29i.
  • the ratio between the duration u of emission of a block on the one hand, and the duration of emission of a marker on the other hand, must be sufficiently large to allow several transmitters to operate simultaneously.
  • the duration T necessary to effect the transition from the agreement of one transmitter to the agreement with another transmitter should be easily reduced within 1 second.
  • the last two fields of the marker, as well as the following fields which are described, are not relevant to the present invention.
  • Distinction between the number of the logical identifier 33 on the one hand and the number of the physical identifier 34 on the other hand is related to a particularity of the messages transmitted, not directly relevant to the subject of the present invention.
  • the messages transmitted may include an a priori expiration hour, beyond which they are no longer significant.
  • these messages are removed from the broadcast cycle at said expiration time.
  • it is advisable that the modification of the cycle which results therefrom is not understood by the receiver as signifying an update. Consequently, the logical version number remains unchanged when a message of this type is removed, and it is therefore the logical identifier 33 that is relevant for the listening and updating strategy of each receiver. .
  • the invention therefore has the advantage, in a preferred application, of allowing a motorist to choose from the thematic transmitters which are proposed to him, those from which he preferentially receives information, and in particular updated information.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Circuits Of Receivers In General (AREA)
  • Multi Processors (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)

Claims (9)

  1. Verfahren für das synchronisierte Senden von Informationsmeldungen durch einen thematischen Sendepark, welcher eine spezialisierte und rekonfigurierbare Hörstrategie mehrerer Sender des Parks erlaubt, ausgehend von einem einzigen Empfänger,
    dadurch gekennzeichnet, daß jeder Sender (21, 22, 23) auf Dauer einen aus einer variablen Zahl von Meldungen bestehenden Zyklus sendet, wobei jeder Meldungszyklus in aufeinanderfolgende Blöcke festgelegter Größe und Zeitdauer zerlegt wird, die für alle Sender identisch sind,
    daR jeder Block eine Zustandskennung genannte Anfangsinformationskennung enthält, und jeder Zyklus eine Synchronisationskennung genannte Anfangsinformationskennung (24, 25, 26) enthält, wobei die besagte Zustandskennung und die besagte Synchronisationskennung eine Versionsnummer des laufenden Zyklus des entsprechenden Senders enthalten,
    und daß die Anfänge der Zyklen (24, 25, 26) eines jeden Senders (21, 22, 23) des Parks von einem Sender zum anderen versetzt sind, so daß die Kennungen eines jeden Senders zu einem anderen Zeitpunkt gesendet werden, als die Kennungen der anderen Sender, damit sie nacheinander von demselben Empfänger empfangen werden können.
  2. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, daß jede Zustandskennung die Anzahl von Blöcken, die bis zur nächsten Synchronisationskennung noch zu senden sind, als Information enthält.
  3. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, daß jede Synchronisationskennung eine Information bezüglich der Anzahl von Blöcken enthält, die bis zur nächsten Synchronisationskennung noch zu senden sind.
  4. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, daß die besagte feste Zeitdauer eines Meldungsblocks etwa 40 bis 150 mal die Sendedauer einer Kennung beträgt.
  5. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, daß jede Synchronisationskennung und/oder jede Zustandskennung eine Information bezüglich der Zahl der neuen Meldungen in der laufenden Version des Sendezyklus im Verhältnis zur vorausgegangenen Version enthält.
  6. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, daß jede Zustandskennung eine Information bezüglich der Zahl der neuen Meldungen in der laufenden Version des entsprechenden Blocks im Verhältnis zur vorausgegangenen Version des besagten Blocks enthält.
  7. Verfahren nach Anspruch 5 oder 6,
    dadurch gekennzeichnet, daß die besagten neuen Meldungen sofort nach dem Senden der Synchronisationskennung des laufenden Zyklus, bzw. nach dem Senden der Zustandskennung des laufenden Blocks, gesendet werden.
  8. Verfahren zum Empfang von Meldungen, die von einem thematischen Sendepark gemäß einer synchronisierten Sendeprozedur nach einem der Ansprüche 1 bis 7 gesendet werden, mittels eines Empfängers, der die empfangenen Informationsmeldungen speichern und verarbeiten kann,
    dadurch gekennzeichnet, daß:
    - man eine Prioritätsrangfolge für das Abhören eines jeden der besagten thematischen Sender wählt;
    - man nacheinander jeden Sender gemäß der gewählten Prioritätsrangfolge abhört, bis zum Empfang einer Senderkennung;
    - man die geänderten Meldungen des empfangenen Senders abhört, falls die empfangene entsprechende Kennung eine andere Versionsnummer trägt, als die Versionsnummer des vorher im besagten Empfänger gespeicherten Informationszyklus;
    - man direkt den in der Prioritätsrangfolge nachfolgenden Sender hört, wenn die empfangene Kennung des laufenden Senders eine Versionsnummer hat, die identisch ist mit der Versionsnummer des im besagten Empfänger gespeicherten Zyklus.
  9. Verfahren zum Empfang von Meldungen, die von einem thematischen Sendepark gemäß einer synchronisierten Sendeprozedur nach einem der Ansprüche 1 bis 7 gesendet werden, mittels eines Empfängers, der die empfangenen Informationsmeldungen speichern und verarbeiten kann,
    dadurch gekennzeichnet, daß:
    - man eine Prioritätsrangfolge für das Abhören eines jeden der Parksender wählt;
    - man nacheinander während einer Zeiteinheit alle Kennungen abhört, die über die Gesamtheit der Parksender versetzt gesendet werden, in der Rangfolge der Versetzung;
    - man den Empfänger gemäß der gewählten Prioritätsrangfolge auf jeden Sender einstellt, für den das Vorhandensein einer neuen Version empfangen wurde, was eine Aktualisierung der Speichermittel erfordert.
EP19890460017 1988-06-17 1989-06-14 Synchronisierter multi-thematischer Informationen-Rundfunk, der eine über einen Sendepark rekonfigurierbare Hörstrategie von Radioprogrammen erlaubt Expired - Lifetime EP0347355B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8808349A FR2633122B1 (fr) 1988-06-17 1988-06-17 Diffusion synchronisee d'informations multithematiques permettant une strategie d'ecoute reconfigurable sur un parc d'emetteurs et de programmes hertziens
FR8808349 1988-06-17

Publications (2)

Publication Number Publication Date
EP0347355A1 EP0347355A1 (de) 1989-12-20
EP0347355B1 true EP0347355B1 (de) 1993-09-22

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EP19890460017 Expired - Lifetime EP0347355B1 (de) 1988-06-17 1989-06-14 Synchronisierter multi-thematischer Informationen-Rundfunk, der eine über einen Sendepark rekonfigurierbare Hörstrategie von Radioprogrammen erlaubt

Country Status (4)

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EP (1) EP0347355B1 (de)
DE (1) DE68909321T2 (de)
ES (1) ES2046522T3 (de)
FR (1) FR2633122B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2038892B1 (es) * 1991-05-22 1995-05-01 Sauro Emilio Garrido Sistema avisador fonico y visual para vehiculos automoviles sobre circunstancias del trafico.
FR2717969B1 (fr) * 1994-03-22 1996-05-31 Nortel Matra Cellular Procédé et équipements pour diffuser des messages vers des stations mobiles de radiocommunication.
US5649297A (en) * 1994-10-21 1997-07-15 Seiko Communications Holding N.V. Transmitting digital data using multiple subcarriers
US5978366A (en) * 1996-12-20 1999-11-02 Ericsson Inc. Methods and systems for reduced power operation of cellular mobile terminals

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1514941A (en) * 1975-09-15 1978-06-21 British Broadcasting Corp Broadcasting messages
GB2068685A (en) * 1980-01-29 1981-08-12 British Broadcasting Corp Selective message broadcasting system
GB2195868A (en) * 1986-08-21 1988-04-13 Gainsborough Holdings Ltd Broadcasting of map information

Also Published As

Publication number Publication date
DE68909321D1 (de) 1993-10-28
EP0347355A1 (de) 1989-12-20
DE68909321T2 (de) 1994-01-20
FR2633122A1 (fr) 1989-12-22
ES2046522T3 (es) 1994-02-01
FR2633122B1 (fr) 1990-11-09

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