EP0347355A1 - 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
EP0347355A1
EP0347355A1 EP89460017A EP89460017A EP0347355A1 EP 0347355 A1 EP0347355 A1 EP 0347355A1 EP 89460017 A EP89460017 A EP 89460017A EP 89460017 A EP89460017 A EP 89460017A EP 0347355 A1 EP0347355 A1 EP 0347355A1
Authority
EP
European Patent Office
Prior art keywords
marker
transmitter
cycle
messages
transmitters
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.)
Granted
Application number
EP89460017A
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English (en)
French (fr)
Other versions
EP0347355B1 (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
Centre National dEtudes des Telecommunications CNET
Gouvernement de la Republique Francaise
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
Application filed by Telediffusion de France ets Public de Diffusion, France Telecom SA, Centre National dEtudes des Telecommunications CNET, Gouvernement de la Republique Francaise filed Critical Telediffusion de France ets Public de Diffusion
Publication of EP0347355A1 publication Critical patent/EP0347355A1/de
Application granted granted Critical
Publication of EP0347355B1 publication Critical patent/EP0347355B1/de
Anticipated expiration legal-status Critical
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    • 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 wireless 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, 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. This causes discomfort for the mobile user (typically the motorist) when he reaches the coverage border of the local transmitter to which it is tuned: he must indeed manually search for another frequency when the reception becomes poor.
  • 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 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 subject of the invention is also a method of receiving messages sent by a fleet of thematic radio transmitters, according to a method of synchronized broadcasting, by means of a receiver provided with means for memorizing and processing the information messages received. , process characterized in that: - a listening priority order is chosen for each of said thematic transmitters; - each transmitter is listened to successively, according to the order of priority chosen, until reception of a marker from the transmitter; listening to the modified messages of the received transmitter in the case where the corresponding marker picked up carries a version number different from the version number of the information cycle previously stored in said receiver; - We listen directly to the next priority order transmitter when the marker received from the current transmitter has a version number identical to the cycle version number stored in said receiver.
  • 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 include 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".
  • - transmitter 1 transmission of a synchronizing marker 24, then of two status markers 271 and 272
  • - transmitter 2 transmitter of the last status marker of the current cycle 28m, then synchronizing marker 25 and first status marker 281 of the new cycle
  • - transmitter 3 transmission of three status markers during the cycle 29i, 29i + 1, 29i + 2.
  • the time period 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 examination of the 28m marker the receiver decides to take an interest in the transmitter 3, he has enough time to agree on the frequency of the transmitter 3 and possibly synchronize his decoder before the diffusion 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.
  • FIG. 3 An example of marker format is shown in Figure 3, in the case of a transmission according to the RDS system discussed above.
  • a cycle marker fits on an RDS group.
  • Each marker (synchronizing or status) carries the following information: .
  • the cycle number in the status markers is the same as the number in the synchronizing cycle marker.
  • Physical-ID (34) (4 bits): this identifier is incremented each time the content of the cycle is physically modified; this field is intended to facilitate the terminal's use of transmission redundancies. .
  • DURATION (6 bits): this field is expressed as an integer of "Time-slots"; the duration of the cycle is actually this number + 1; when the marker is of the "state” type, it is the time necessary to broadcast the end of the cycle, or more precisely the number of time-slots to elapse until the next synchronizing marker, when the marker is synchronizing it this is the time required to broadcast the entire cycle.
  • NB-NOUV (6 bits). This field indicates, in binary, the number of new messages compared to the last logical version (which may or may not be the last broadcast); the value O indicates an overflow (more than 255 new messages); new messages are systematically broadcast in the NB-NOUV first positions in the cycle; .
  • NOUVDEP (1 bit); this field indicates if the NBNOUV new messages are entirely placed in the cycle in front of this marker. This is, especially for the status markers, to specify whether the new features of the cycle follow or whether to wait for the start of the next cycle.
  • .VGP (38) (1): Indicator of the presence of a management channel (value 1).
  • AL (39) (1): indicator for the presence of an alarm message on a service transmitter (broadcast in emergency U3).
  • 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. .
  • a listening priority order is chosen for each of said thematic transmitters; - each transmitter is listened to successively, according to the order of priority chosen, until reception of a marker from the transmitter; listening to the modified messages from the transmitter received in that the corresponding marker carries a version number different from the version number of the information cycle previously stored in said receiver; - we listen directly to the next priority order transmitter when the marker above the current transmitter has a version number identical to the cycle version number stored in said receiver.
  • a listening priority order is chosen for each of the park's transmitters; - we listen to successively, during a unit of time, all the markers broadcast in offset on all the transmitters of the park, in fact we will capture, during this unit of time, a nmarker per transmitter, the order of listening to transmitters being independent of the priority orders chosen, but only dependent on synchronized offsets between transmitters; - Finally, the receiver is wedged on each transmitter for which the existence of a new version has been detected, requiring an update of the on-board database, following the order of priority chosen.
  • 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)
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 true EP0347355A1 (de) 1989-12-20
EP0347355B1 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)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995026112A1 (fr) * 1994-03-22 1995-09-28 Nortel Matra Cellular Procede et equipements pour diffuser des messages vers des stations mobiles de radiocommunication
ES2083308A1 (es) * 1991-05-22 1996-04-01 Sauro Emilio Garrido Un sistema avisador fonico y visual para vehiculo s automoviles sobre las circunstancias del trafic o
WO1998028931A3 (en) * 1996-12-20 1998-11-12 Ericsson Ge Mobile Inc Methods and systems for reduced power operation of cellular mobile terminals
EP0787412A4 (de) * 1994-10-21 2002-09-18 Seiko Comm Holding N V Digitale datenübertragung über mehrere hilfsträger

Citations (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
EP0033218A1 (de) * 1980-01-29 1981-08-05 British Broadcasting Corporation Sende- und/oder Empfangssystem für Mitteilungen über Rundfunk
GB2195868A (en) * 1986-08-21 1988-04-13 Gainsborough Holdings Ltd Broadcasting of map information

Patent Citations (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
EP0033218A1 (de) * 1980-01-29 1981-08-05 British Broadcasting Corporation Sende- und/oder Empfangssystem für Mitteilungen über Rundfunk
GB2195868A (en) * 1986-08-21 1988-04-13 Gainsborough Holdings Ltd Broadcasting of map information

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NTZ - NACHRICHTENTECHNISCHE ZEITSCHRIFT, vol. 40, no. 5, mai 1987, pages 346-348,350-351, VDE-Verlag, Berlin, DE; F. STOLLENWERK: "RDS - Ein neuer Dienst im UKW-Rundfunk" *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2083308A1 (es) * 1991-05-22 1996-04-01 Sauro Emilio Garrido Un sistema avisador fonico y visual para vehiculo s automoviles sobre las circunstancias del trafic o
WO1995026112A1 (fr) * 1994-03-22 1995-09-28 Nortel Matra Cellular Procede et equipements pour diffuser des messages vers des stations mobiles de radiocommunication
FR2717969A1 (fr) * 1994-03-22 1995-09-29 Nortel Matra Cellular Procédé et équipements pour diffuser des messages vers des stations mobiles de radiocommunication.
AU690665B2 (en) * 1994-03-22 1998-04-30 Nortel Matra Cellular Method and equipment for transmitting messages to mobile radio stations
US5878033A (en) * 1994-03-22 1999-03-02 Nortel Marta Cellular Process and equipment for broadcasting messages to mobile radio communication stations
CN1073785C (zh) * 1994-03-22 2001-10-24 诺泰尔·马特拉蜂窝电话公司 给移动无线通信台广播消息的方法及设备
EP0787412A4 (de) * 1994-10-21 2002-09-18 Seiko Comm Holding N V Digitale datenübertragung über mehrere hilfsträger
WO1998028931A3 (en) * 1996-12-20 1998-11-12 Ericsson Ge Mobile Inc Methods and systems for reduced power operation of cellular mobile terminals
US5978366A (en) * 1996-12-20 1999-11-02 Ericsson Inc. Methods and systems for reduced power operation of cellular mobile terminals

Also Published As

Publication number Publication date
DE68909321D1 (de) 1993-10-28
DE68909321T2 (de) 1994-01-20
FR2633122A1 (fr) 1989-12-22
ES2046522T3 (es) 1994-02-01
FR2633122B1 (fr) 1990-11-09
EP0347355B1 (de) 1993-09-22

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