EP0676872A1 - Zyklischer und zellularer Datenrundfunk - Google Patents

Zyklischer und zellularer Datenrundfunk Download PDF

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Publication number
EP0676872A1
EP0676872A1 EP95400578A EP95400578A EP0676872A1 EP 0676872 A1 EP0676872 A1 EP 0676872A1 EP 95400578 A EP95400578 A EP 95400578A EP 95400578 A EP95400578 A EP 95400578A EP 0676872 A1 EP0676872 A1 EP 0676872A1
Authority
EP
European Patent Office
Prior art keywords
broadcast
period
broadcasting
during
message
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.)
Withdrawn
Application number
EP95400578A
Other languages
English (en)
French (fr)
Inventor
Jean-François Marquet
Christian Gauthier
Roger Motsch
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
Original Assignee
Telediffusion de France ets Public de Diffusion
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 filed Critical Telediffusion de France ets Public de Diffusion
Publication of EP0676872A1 publication Critical patent/EP0676872A1/de
Withdrawn legal-status Critical Current

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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
    • H04H20/18—Arrangements for synchronising broadcast or distribution via plural 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
    • G08G1/092—Coding or decoding of the information
    • 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
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/20—Arrangements for broadcast or distribution of identical information via plural systems
    • H04H20/22—Arrangements for broadcast of identical information via plural broadcast systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/02—Arrangements for relaying broadcast information
    • H04H20/06—Arrangements for relaying broadcast information among broadcast stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/16—Arrangements for broadcast or for distribution of identical information repeatedly
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
    • H04H20/34—Arrangements for simultaneous broadcast of plural pieces of information by plural channels using an out-of-band subcarrier signal
    • 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
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/14—Arrangements for conditional access to broadcast information or to broadcast-related services
    • H04H60/19—Arrangements for conditional access to broadcast information or to broadcast-related services on transmission of information
    • 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
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/49—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying locations
    • H04H60/50—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying locations of broadcast or relay stations

Definitions

  • the present invention relates generally to the dissemination of information from a network of transmitters to mobile receivers.
  • the invention relates more particularly to a method of broadcasting data broadcast by data receiving / broadcasting means distributed in N broadcasting areas and in relation to a network distribution head, where N is a positive integer.
  • Such a method is used in a road information system intended for users, in particular mobiles such as road vehicles.
  • the information useful for road vehicles belongs to three categories: endogenous information, that is to say generated by different sensors on the vehicle, information on board and stored on a storage medium, and finally exogenous information relating to the user environment.
  • This last category covers in particular road traffic information intended for road vehicles. This information concerns for example the state of the roads, the location of works, and the availability in the car parks of a city.
  • an information system for road vehicles moving in this territory fulfills various functions such as collecting information, formatting and disseminating it.
  • a message includes a header containing information on the message itself and a data field containing the actual information which will be received by the user, for example: "Works on road A at junction B".
  • the RDS system is based on a frequency modulation (FM) sound broadcasting network.
  • An FM transmitter has a relatively short range, of some tens of kilometers; the RDS system therefore uses a network of transmitters, distributed geographically and frequently, so that each point of a given territory is covered by at least one given transmitter, without being "scrambled" by the others.
  • the territory is therefore divided into a finite number of diffusion zones, partially overlapping.
  • a mobile receiver moving within the coverage area of a given transmitter receives traffic information by being tuned to the frequency of this transmitter. Thanks to the RDS system, the transmitter regularly transmits to the receiver the frequencies of the geographically neighboring transmitters which broadcast the same program. The mobile receiver automatically compares the level of power received on these different frequencies. When the mobile receiver reaches the overlap area of two or more transmitters, it automatically switches to the frequency with the highest power level.
  • the RDS system offers a useful bit rate available per transmitter, for an application of the type "broadcasting of information messages "which is limited and on the order of 100 bit / s. This speed is much lower than the amount of information relating to the territory covered by the broadcasting system.
  • This amount of information is high since the information system is only of economic interest if the territory covered is large to cover a large number of users, and also because of the very nature of traffic information which is " slowly variable ". Indeed, a given piece of information is relevant for a certain period, with possible modifications of this information, and must be repeated at regular intervals during this period, so that it reaches a maximum of users.
  • the dissemination of information is cyclical. It is therefore not possible to disseminate all of the information concerning the territory throughout the territory. In order for a given user at a given point in the territory to receive the information that is useful to him, the information sent to him must be sorted. This sorting is carried out by means of cellularization or regionalization of the information.
  • a broadcasting area is a part of territory for which a set of information can be defined which is of interest to any user located at any point in the area.
  • a broadcast area includes at least one transmitter that broadcasts information relevant to the area and different from information from neighboring areas.
  • a switching device in the receiver automatically changes the reception frequency in burst; the receiver then alternates between a synchronization search and a data acquisition procedure. Data acquisition is disrupted, which leads to loss of information during the crossing of the overlap area.
  • the present invention aims to provide a data broadcasting method which minimizes the loss of information when a mobile receiver switches from one transmitter to another, in order to be implemented in particular in a cellular data broadcasting network. and cyclical.
  • a method of broadcasting data in N broadcasting areas each comprising at least one data receiver / broadcaster means in relation to a network distribution head is characterized in that the head distribution system successively transmits a common data packet and N zone data packets respectively associated with the N zones for a first predetermined period and in that each receiver / broadcaster means in each of the broadcasting zones detects identifiers in the common packet and in a respective one of said N zone packets so as to establish a message having a predetermined length as a function of the common and zone packets and to be broadcast repeatedly during a second period following the first period said message, the messages broadcast by all the receiving / broadcasting means being synchronous.
  • the common data packet sent by the distribution head during a period contains a synchronization word, and the synchronization of the messages broadcast by the receiver / broadcast means during said one period depends on this synchronization word.
  • the common data packet sent by the distribution head during a first period contains a message length indicator, and the messages broadcast by the receiver / broadcast means during the following period have a length dependent on this indicator, the same message being repeated a predetermined number of times in each period.
  • the messages broadcast respectively by all the receiving / broadcasting means during a period respectively contain a stuffing sequence such that all the messages broadcast have the same length.
  • the common data packet sent by the distribution head during a first period contains a message repetition indicator and the messages broadcast by the receiver / broadcast means during the following period are repeated a number of times dependent on said indicator of repetitions during the following period.
  • the distribution head multiplexes the common data packet and the N zone data packets with a video signal, by inserting them into the lines removing the video signal frame, so as to transmit them on a television channel.
  • Each message broadcast by a receiver / broadcaster means may contain a zone identifier.
  • a mobile receiver receiving the messages stores the zone changes, for example to control and limit the frequency of these changes relative to the duration of the messages.
  • the receiver / broadcaster means include in the message to be broadcast, following information established as a function of said common and zone packets, a block established as a function of local information received via a means of local transmission. Local information supplements the information sent by the distribution head.
  • a traffic information broadcasting network comprises a network distribution head TD, and a plurality of receiver / broadcast means RD 1,1 to RD N, JN defining N broadcast zones Z1 to Z N , N and JN being whole numbers.
  • Each diffusion zone Z n comprises Jn receiver / diffusers means defining with different frequencies, the integer Jn possibly being equal to 1, 2, 3 or 4 for example.
  • the distribution head receives traffic information through a data transmission route.
  • This transmission route is an X.25 link, which transmits data in the form of packets conforming to the CCITT X.25 recommendation.
  • the distribution head TD transmits N + 1 data blocks to the plurality of receiver / broadcast means distributed in the N broadcast areas.
  • the N + 1 data blocks are successively a data block common to all zones and N zone data blocks associated respectively with the N zones Z1 to Z N.
  • the data transmitted by the distribution head is formatted into data packets multiplexed to a video signal in a television channel.
  • Each receiver / broadcaster means processes the data packets in the television channel to extract the information contained in the common block and the block associated with the respective broadcasting zone in order to distribute them cyclically in the form of repetitive messages.
  • the messages broadcast by all the receiving / broadcasting means are synchronous.
  • a vehicle moving on the road axis AR is always located in at least one of the diffusion zones Z1 to Z N.
  • the vehicle user then accesses the information through a dedicated receiver placed in the vehicle.
  • a dedicated receiver placed in the vehicle.
  • Such a receiver comprises for example a display screen on which the information contained in a message is displayed and therefore in the common block and the associated block.
  • the network distribution head TD essentially comprises a depacketizer / demultiplexer DD, a digital channel coupler C, a video-data multiplexer MX1, and a television channel transmitter EM.
  • the depacketizer / demultiplexer DD receives via the transmission artery AT, N + 1 digital multiplexed channels V c and V1 to V N according to the X.25 packet transmission mode.
  • the digital channel V c supports the information common to all the zones, and the digital channel V n supports the information specific to the zone Z n .
  • the depacketizer / demultiplexer DD depackets and demultiplexes the X.25 packets then identifies the packets so as to reconstruct the N + 1 digital channels V c and V1 to V N at parallel outputs.
  • the N + 1 digital channels are transmitted to the coupler C which produces a digital packet frame.
  • Each packet contains the data of a digital channel.
  • the packet frame is time multiplexed with a video signal by the multiplexer MX1.
  • the multiplexer MX1 uses the resources available in a video signal SV constituted by time intervals unoccupied by the image itself. These time intervals correspond to the free active portion in the few lines of the video frame suppression signal, this free portion succeeding the line synchronization signal in each line.
  • the packets formed by the coupler C are inserted respectively and successively in these free portions of the video signal through the multiplexer MX1.
  • a frame blanking signal line L n produced by the multiplexer MX1 successively comprises a line synchronization interval SC then a data packet pd n associated with the broadcasting area Z n and contained in the PA active portion of the line.
  • the data packet Pd n comprises a header and n with 8 bytes and a data block bd n having a maximum length of 32 bytes.
  • the header and n includes a synchronization burst used by the receiver / broadcast means RD n, 1 to RD n, Jn associated with the zone Z n , as well as a length indicator IL n of the data block bd n and an identifier I n of the digital channel V n , and consequently of the diffusion zone Z n .
  • the header and c associated with a common data packet pd c also includes, in a manner analogous to the header and n , the synchronization burst as well as a length indicator IL c of the data block bd c relating to information common to the zones and supported by the channel V c and a common identifier I c .
  • the N + 1 packets formed in buffer memory in the coupler C namely the first packet pd c with the header and c and the data block bd c then the packets pd1 to pd N associated with the channels V1 to V N and in zones Z1 to Z N are successively read in the coupler so that these packets are introduced into the active parts of the line blanking lines, for example at the rate of three lines per video frame as illustrated in FIG. 4.
  • a first video frame TV1 comprises the line L c containing the packet pd c and the lines L1 and L2 containing the packets pd1 and pd2 respectively, and so on until a last frame video TV k which comprises at least one of the lines L N-2 , L N-1 and L N containing the packets pd n-2 , pd n-1 and pd n .
  • the integer N is between 3 (K-1) and 3K
  • the renewal period PR is at least greater than K periods of video frame.
  • the renewal period PR defines in the distribution head TD a period during which the information disseminated by the means RD 1,1 to RD N, JN remain respectively unchanged.
  • the signal resulting from the multiplexing of the N + 1 packets pd c and pd1 to pd N and from the video signal SV is transmitted to the television channel transmitter EM.
  • a video receiver RV receives by an antenna ANT the video signal emitted by the distribution head TD.
  • a synchronization circuit CS connected to the receiver recovers the video frame synchronization and the line synchronization for the recognition and the processing of the received video frames.
  • a block extractor EX receives in baseband the video signal from the receiver RV in order to recognize the packets pd c and pd n during each renewal period PR among the video frames carrying in particular the N + 1 packets.
  • the extractor circuit EX detects the packets pd c and pd1 to pd N by means of the synchronization bursts and identifies the packets pd c and pd n by means of the common identifier and the channel identifier Vn. These identifications make it possible to extract the data block bd c and the data block bd n accompanied by the corresponding block length indicators.
  • the recognition of the packet pd c by the extractor EX also contributes to synchronizing a time base BT producing various clock signals to control subsequent operations in the other circuits of the receiver / diffuser means RD n, j .
  • the data blocks bd c and bd n and the corresponding length identifiers IL c and IL n are applied to a formatting circuit CF which processes them to form second data blocks BD c and BD n in a format compatible with subsequent broadcasting to mobile receivers in vehicles.
  • the blocks BD c and BD n are applied successively to a first input of a multiplexer MX2.
  • a CET header formation means essentially constituted by a programmable read-only memory PROM forms a message header AND n applied to a second input of the multiplexer MX2.
  • the PROM memory stores in particular an area identifier IZ n associated with the area Z n and frequency characteristics, such as the digitized transmission frequencies of the receiver / broadcast means RD n-1,1 to RD n-1, J (n -1) and RD n + 1.1 to RD n + 1, J (n + 1) included in the geographically neighboring zones Z n-1 and Z n + 1 .
  • the header AND n with the blocks BD c and BD n are thus multiplexed by the multiplexer MX2 to be applied to a first input of another multiplexer with three inputs MX3.
  • a message stuffing circuit CB fills with stuffing bits the end of the message M n to be broadcast by the receiver / broadcaster RD n, j , knowing that the message has a predetermined length LM, expressed in number of bits.
  • the circuit CB contains in programmable read-only memory the message length LM and the constant length LE of the message header AND n , and receives the data block length identifiers IL c and IL n from the extractor EX.
  • the receiver / broadcaster RD n, j comprises at output a transmitter EF with transmission antenna AE which frequency modulates each digital message M n read cyclically in one of the memories MM1 and MM2 during a period PR, and more generally the messages M n read alternately in the memories MM1 and MM2 at the respective periods PR.
  • a PR renewal period is between 3 and 5 minutes, and a message has a duration of a few tens of seconds.
  • each message M n relating to the broadcasting area Z n included a block of local information BIL n .
  • This local information is received locally in a CIL circuit included in each of the receiver / broadcast means RD n, j in the zone Z n , through a local transmission means MTL.
  • This MTL means can be a local broadband cable network, with a dedicated telephone line, or even more simply a user telephone line, transmitting local information from sources located near the zone Z n .
  • this determines the length LL n of the block BIL n according to the difference DIF LM - (LE + IL c + IL n ), so that LL n is less than or equal to DIF.
  • the complement DIF - LL n is signaled by the local information formatting circuit CIL to the stuffing circuit CB which produces stuffing bits in number corresponding to DIF-LL n .
  • the multiplexer MX3 receives by a third input the serialized block BIL n established by the circuit CIL in order to introduce it into the message to be constituted M n , between the block BD n and a stuffing bit sequence SB n , as shown in Figure 6.
  • FIG. 6 are also shown messages M n + 1, m-1 , M n + 1, m and M n + 1, m + 1 established simultaneously in the receiver / broadcast means RD n + 1.1 to RD n + 1, J (n + 1) included in the zone Z n + 1 during PR m-2 , PR m-1 and PR m renewal periods and distributed cyclically during PR m-1 , PR m and PR m + 1 periods, respectively.
  • all the messages broadcast in all the zones Z1 to Z N are synchronous; for example, the header AND n , AND n + 1 of the first messages M n, m , M n + 1, m at the start of a renewal period PR m is synchronous with the header and c in the common packet pd c which is received by all the receiver / broadcast means, which is included in a video frame line L c by the distribution head TD during the period PR m and which relates to common information to be broadcast during the next renewal period PR m + 1 .
  • the headers AND n , AND n + 1 and the common data blocks BD c are respectively synchronous.
  • a dedicated mobile receiver on board a vehicle automatically switches in frequency intermittently during the crossing of a diffusion overlap zone relating to two receiving / diffusing means, and more particularly to two associated receiving / diffusing means with two distinct diffusion zones, as indicated in ZR n-1, n between zones Z n-1 and Z n and ZR n, n + 1 between zones Z n and Z n + 1
  • the invention provides on board of a vehicle maintaining reception of minimum information constituted by the common block BD c .
  • the frequency switching in a mobile receiver constituting the implementation of the method according to the invention is carried out systematically at the start / end of the cycle, for example just before receiving the header of a message so that the reception of the common block of the next message received with the new frequency is not disturbed by frequency switching.
  • the length of the messages M n , M n + 1 and the duration of the periods PR are variable and composed by the distribution head as a function in particular of the length of the blocks of data bd c and bd1 to bd N to be transmitted, some of which are very long, can be distributed in the two, three or more, active image parts of several lines for suppressing successive video frames.
  • the header and c of a common packet pd c sent during a period PR m also contains a length indicator IM m + 1 for the messages M n, m + 1 , M n + 1, m + 1 to be broadcast during the following period PR m + 1 , this indicator IM m + 1 being written in memory in the circuits CB and CIL in place of the length LM according to the embodiment described above.
  • the time base BT in each receiver / broadcaster means controls NL readings of the same messages in one of the memories MM1 and MM2 during the period PR m + 1 , the duration of which is proportional to (NL.IM m + 1 ).
  • the number NL of message repetitions is programmed by the distribution head at each renewal period, and is included in the header and c of common packet pd c .

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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)
  • Time-Division Multiplex Systems (AREA)
EP95400578A 1994-04-11 1995-03-15 Zyklischer und zellularer Datenrundfunk Withdrawn EP0676872A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9404352A FR2718586B1 (fr) 1994-04-11 1994-04-11 Diffusion de données cyclique et cellulaire.
FR9404352 1994-04-11

Publications (1)

Publication Number Publication Date
EP0676872A1 true EP0676872A1 (de) 1995-10-11

Family

ID=9462034

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95400578A Withdrawn EP0676872A1 (de) 1994-04-11 1995-03-15 Zyklischer und zellularer Datenrundfunk

Country Status (2)

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EP (1) EP0676872A1 (de)
FR (1) FR2718586B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1098286A2 (de) * 1999-11-04 2001-05-09 Nec Corporation Rundfunksverfahren und Vorrichtung dazu

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174272A (en) * 1983-05-18 1986-10-29 Bbl Ind Inc Paging network
US4868860A (en) * 1988-02-22 1989-09-19 Telefind Corp. Paging system for entering pages by local telephone call
FR2672756A1 (fr) * 1991-02-12 1992-08-14 Telediffusion Fse Systeme de radiomessagerie et terminal d'abonne pour recevoir des messages du systeme.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174272A (en) * 1983-05-18 1986-10-29 Bbl Ind Inc Paging network
US4868860A (en) * 1988-02-22 1989-09-19 Telefind Corp. Paging system for entering pages by local telephone call
FR2672756A1 (fr) * 1991-02-12 1992-08-14 Telediffusion Fse Systeme de radiomessagerie et terminal d'abonne pour recevoir des messages du systeme.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1098286A2 (de) * 1999-11-04 2001-05-09 Nec Corporation Rundfunksverfahren und Vorrichtung dazu
EP1098286A3 (de) * 1999-11-04 2001-11-21 Nec Corporation Rundfunksverfahren und Vorrichtung dazu

Also Published As

Publication number Publication date
FR2718586B1 (fr) 1996-05-10
FR2718586A1 (fr) 1995-10-13

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