EP1030475A2 - Method for the transmission of digitally coded traffic information and receiver for implementing this method - Google Patents

Abstract

Coded traffic messages are transferred according to a standardized assembly/format, particularly in accordance with a TMC method. A header (12) is placed before the traffic messages coded in digital form (13) and that at least one further information (14-16) follows the traffic message coded in digital form (13), in which case one of this information contains a topography information (14). An Independent claim is included for: (a) a radio receiver

Description

State of the art

The invention is based on a method for transmission of digitally encoded traffic news and one Radio receiver for this purpose, according to the genus of claims 1 and 7. From DE-35 36 820 C2 it is already known receiver build up where the traffic news is standardized be transmitted. Here are given highway numbers or federal road numbers, route names, mostly places, assigned and provided standard texts, so that on encoded way very fast traffic news can be transferred. The highway numbers that Route names and other place names as well as the Standard texts are stored in a memory and carried in a corresponding radio receiver. Kick now an obstacle to traffic, so the information digitally transmitted in the form of abbreviations and then in Broadcast receiver for a complete message composed. This ensures that with very few Bytes of complete traffic messages are transmitted can, so that even with less powerful Data transmission systems very many traffic news in be transmitted in a relatively short time.

This becomes problematic when Autobahn designations or federal highway designations changed or place names or other Route names in the context of restructuring be changed. Then from one, with one appropriate memory equipped radio receiver Locations reproduced in this form, for example are no longer legible on signs, so the driver is irritated.

Advantages of the invention

According to the invention it is now proposed that actually standardized transmitted coded traffic announcement add at least one location description. This will it is also possible to respond to changed place names or but also to transfer place names that are in one original memory of the radio receiver is not provided are. As the digital message transmission continues over Radio is always increasing, and more recently too Transmission methods are available, which are also a high data traffic, it continues to be possible to access a memory in the radio receiver waive or only the given standard texts in this Store memory and the location in general to the attach digitally encoded traffic message. This increases the flexibility of the digitally to be transmitted Traffic news to a great extent. The header is used that the radio receiver can recognize that not only digital coded traffic messages are transmitted, but the digitally encoded traffic data location information or other information will follow.

Advantageous further developments and Improvement to the method specified in claim 1 shown. The header is also particularly advantageous to encrypt traffic messages at the same time use. This makes it possible, for example, To provide traffic news only when certain services are received or fees were paid. It is also advantageous that divide further information into classes, each Class a class identifier and at least one package having. By dividing it into classes, it is possible not only to transmit location information, but also further additional information with the Connect traffic news, for example to memory to be provided with new location data in the radio receiver or but additional foreign language texts of place names to transmit, so that foreign drivers the Receive information in your native language. It is cheap also that the number of subsequent packets after the Class identifier is transferred. This will ensures that the radio receiver is able to all information of a class is complete to record. It is still cheap to go through every package the packet type, that is the content of the information and the To determine data. This makes it possible in a class Transfer packets of different types. It is advantageous it continues to have a minimum number of for each class Mandatory packages is set. This ensures that for every class really all the information that are imperative to be transferred.

The radio receiver according to the invention for performing the Method according to one of claims 1 to 6 has a Separator of digital data and voice information and an evaluation circuit for evaluating the digital transmitted traffic news. Hereby it will possible, based on the header on the one hand To check reception authorization and on the other hand to recognize what information besides the digitally coded transmitted Traffic news otherwise in the message packet is included. It is also advantageous if the radio receiver only has a memory for standard texts. By This measure is achieved that standard texts on everyone Case do not need to be transferred.

drawing

Figur 1 einen Funkempfänger zur Realisierung der Erfindung,

Figur 2 den Aufbau eines Datenwortes gemäß der Erfindung

Figur 3 den Aufbau eines Datenwortes für die Klasse und

Figur 4 den Aufbau eines Datenwortes für ein Paket.

An embodiment of the invention is shown in the drawings and explained in more detail in the following description. Show it

FIG. 1 shows a radio receiver for realizing the invention,

Figure 2 shows the structure of a data word according to the invention

Figure 3 shows the structure of a data word for the class and

Figure 4 shows the structure of a data word for a packet.

Description of the embodiment

Figure 1 shows a radio receiver, for example one Broadcast receiver with an antenna 1 to which a Broadcast receiving part 2 is connected. At the exit of the Broadcast receiving part 2 is the decoded received Signal available. With the well-known FM radio in addition to the spoken words and the music spoken traffic radio and via the radio data system RDS broadcast digitally encoded traffic news. The Coding is based on a standard that is specifically for the limited data capacity was developed by RDS. At the output of the receiver 2, the received Information separated. The spoken words become that Amplifier 3 supplied and via the speaker 4 to the listener made audible. The digitally transmitted data is the Decoder 5 supplied, at the output of a serial signal with so-called TMC data is available. These will now processed in the microcomputer 6 and the driver one Vehicle acoustically or optically displayed.

Due to the low transmission bandwidth, the Channel properties and other objectives, for example language independence, will be in today's Transmission of traffic news on standardized Basis for keeping lists and tables in the Terminal devices for decoding the messages received required, as in the aforementioned patent is described. Nowadays, TMC messages are not only used to inform the driver, but also for dynamization navigation, i.e. when calculating before driving routes the traffic situation is taken into account in navigation systems, which was transmitted via TMC, so that for example the Navigation already gives hints on how to avoid a traffic jam is.

The problem with TMC is that carried in the terminal Lists and tables, in particular the To be mentioned is the location code table, which is the list of all locations for the road network relevant for the traffic announcement saved. There is also an event list in which the possible events are listed are, for example, the length of a traffic jam and the reason why a traffic jam occurred. Aside from what is needed Storage space is the update of the location code tables a problem and it should be remembered that not all Traffic reports can be encoded, especially if by blocking or adding more streets Location code table is out of date. The event list only allows the use of the predefined events. New events can be viewed through TMC in its familiar form not be transferred. On the other hand, TMC enjoys one increasing popularity because of the standard won with very little information a lot of information can be conveyed.

Increasingly, TMC is no longer only used in FM radio, but is also used in conjunction with GSM radio telephones, which also takes advantage of the TMC location with the short transmission times. TMC is also under discussion with new, advanced broadcast transmission systems, such as digital audio broadcasting (DAB). Due to the advanced technology, however, the newer transmission methods are able to transmit significantly higher data rates than is the case with RDS-TMC.
It is essential, however, that all radio reception systems have in common that after the reception and the demodulation of the information the speech information and TMC information must be separated, which must be processed in a suitable manner in a computer. FIG. 2 now shows a method for transmitting digitally coded traffic messages which is backwards compatible with the known TMC method, that is to say offers additional information options using the known TMC method. A standard TMC message 13 is broadcast expanded. The expanded TMC message 10 is composed of a header 12 and the actual message 11. The message 11 itself in turn consists of a standardized TMC message 13, as well as at least one piece of additional information 14, 15 and 16. If a header 12 precedes the TMC message 13, at least one additional piece of information 14 must be present, which is also transmitted. This additional information 14 must also be location information. The additional information 15 and 16 and additional information are optional and are used to transmit different classes of information.

The header 12 is necessary in order to be able to recognize that it is an expanded TMC information. The header 12 may include information about how much Additional information 14, 15 and 16 of the actual TMC message follow and serves one if needed Encrypt the TMC message. Such Encryption must be signaled and at the same time must what type of encryption it is acts. A header can therefore also be used Encryption indicator must be incorporated. So it will possible to encrypt the TMC message differently and different TMC information depending on the service for example, to transmit via GSM or DAB. That's the way it is for example possible, a service provider A a first Assign encryption and a service provider B a other encryption method. So it is also by means of GSM possible, either via the short message channel or via usual GSM signals depending on the service provider to transmit different traffic information. The Header is therefore able to identify a extended TMC message to perform other tasks, such as encryption and how much Additional information is expected.

While the structure of the TMC message 13 is standardized, see above that there is no need to go into detail here the additional information can be structured differently. It is important that at least one piece of additional information 14 is a Contains location description, otherwise an extended TMC message wouldn't make sense.

The additional information is shown in detail in FIG. 3. The additional information that has different contents can, is divided into so-called classes 20, where the classes from a class identifier 21, from a Class length 22, which is the number of subsequent packets describes and composed of the packages 23, 24, wherein the number of packages only by the class length 22 is determined. It is still important that certain Classes with a specific class name Minimum amount of mandatory packages is assigned, so that a optimal evaluation of the TMC data is possible. In addition however, any other packages can optionally be attached become. The definition of class 20 is also for the TMC message 13 itself applicable. As a class identifier the code for TMC messages is then at position 21 used, while the class length is the number of TMC messages indicates. Then as packets 23 and 24 follows one TMC group each. There is therefore a TMC message for a package several TMC messages are to be transmitted transferred, several packets are to be formed. The standardized traffic reports also allow that traffic information not only from a group, but also can consist of up to five groups. In this case must have a total of five packages 23, 24 for a traffic announcement be used. Recognizing the togetherness of the Packets can be seen in Figure 4, since it is shown here that each packet 23 and 24, there designated 25, on the one hand consists of type 26 and data 27. At the Type marking 26 can now be seen whether the subsequent data 27 to a previous packet belong, or whether the data 27 in itself are interpretable. TMC messages can now be due to the construction of the class several traffic reports together are transmitted via the TMC message module 13.

As already mentioned, one of the additional information items 14 contain a class to describe the location. And here Information from those contained in the TMC report encoded locations are included. Depending on the type the situation described in the TMC message is required one or more for such a location description different types of packages. The combination of packages in terms of number, type and order lead to education several different classes, these classes Required information included. Mandatory information for the Location information is, for example, packets for the Street name, for the name or short name of the Street, its numbering, coordinates, audio modules and to see something similar. This enables the in to add content transmitted in coded form to TMC data, which are constantly updated. Offers for the recipient then there is the advantage that the aforementioned memory for example not available with a GSM handheld radio must be because the data to encode the TMC packet then transmit location information in the class become. This already results in an output of the information possible on the display. Be additional Transferring audio information becomes a voice reproduction reached. Coordinates can also be added these coordinates are used immediately to Navigation device to be transferred, so that a new one Route calculation is simplified. In others Classes can now have application-specific applications are stored, for example additional information for special navigation systems pointing out sights or special hazard information, such as a steep gradient, black ice or curve.

3 km Stau" und ähnliches in einem Speicher des Funkempfängers abgelegt wird während andere Informationen, deren Änderung mehr wahrscheinlich ist, wie beispielsweise Ortsnamen, übertragen werden. Dies ist jedoch nicht zwingend. Selbstverständlich ist es möglich, gar keinen Speicher vorzusehen und auch die Ereignisse als Zusatzinformation zu übertragen, oder aber eine komplette Ortscode- und Ereignisliste vorzuhalten und nur solche Informationen als erweiterte Themen zur Information zu übertragen, die in der Ortscodeliste nicht enthalten sind. Wesentlich dabei ist, daß die TMC-Meldung selbst mit der bereits genormten TMC-Meldung kompatibel ist.The microprocessor 6 in FIG. 1 additionally contains a memory 7, in which the standardized events are stored in a special exemplary embodiment of the invention. Since the normalized events change less frequently than location data, mixed operation can also be achieved by the invention, namely by part of the necessary TMC information, in particular the events such as

3 km of traffic jam "and the like is stored in a memory of the radio receiver while other information whose change is more likely, such as place names, is transmitted. However, this is not mandatory. Of course it is possible to provide no memory at all and also to record the events as To transmit additional information, or to keep a complete location code and event list and only transmit information as extended topics for information that is not included in the location code list. It is essential that the TMC message itself with the already standardized TMC message is compatible.

The following table 1 shows various packet types that can be transmitted as a packet in a class of additional information. No Package type Type length description 0 number 5 bytes TMC group 1 number 8 bytes Location: ECC + CC + LocDB # + Locationcode (according to ALERT C) 2nd number 1 byte Street class (primary, secondary, etc., coded as 1,2, etc.) 3rd Street designation n bytes Street ID (e.g. A, ST, etc.) 4th Street designation n bytes Street number (e.g. 4.1204 etc.) 5 text n bytes Street suffix (e.g. n, old, etc.) 6 Surname n bytes Street name (e.g. Kölner Ring) 7 Surname n bytes 1. Segment name 8th Surname n bytes 2. Segment name 9 text n bytes Location type (according to ENV12313-3, e.g. A1.0, P1.13.etc.) 10th text n bytes Location type designation (e.g. exit) 11 Surname n bytes Location name (e.g. Hildesheim-Drispenstedt) 12th number n bytes Exit number (e.g. 17b) 13 text n bytes Territory designation (e.g. administrative district) 14 Surname n bytes Area name (e.g. Hanover) 15 number n bytes Forwarding number 16 text n bytes Redirection suffix 17th Koo 18 bytes Point coordinate (WGS84) 18th Koo 36 bytes Coordinate pair (WGS84) 19th number 8 bytes Cross reference to other location code 20th Street designation n bytes Europe street number (e.g.4 for the E4) 21 Audio n bytes Audio file 22 number 1 byte Version number (of the location database) 23 text n bytes Free text .. 24th n bytes Location list line (for updating lists in the end device)

Table 2 shows different class structures. No Mandatory packages Optional packages description 1 1,9,10,17 12.13 Area reporting 2nd 1,2,4,7,8,17 3,5,6,12,13,14 19 Road or segment message 3rd 1,2,4,9,10,13,16 3,5,6,7 8,12,18 19 Point in town 4th 1,2,4,7,8,9, 10,11,16 3,5,6,12,13,14 15,18 Point outside a city 5 1,2,4,9,10,13,16 3,5,6,12,18,19 2 points in a city .. .. .. 9 2,4,7,8,1,9, 10,11,16,1,9,10,11,16 3,5,6,12,14,15 18,19 2 points, both outside a city .. 17th 245 - Location list update ..

Here, for example, it is listed that class 1 with certain numbers according to the table, plus an additional two optional packets can be transmitted, but not are imperative. The same applies to the other classes see.

In the following, the way of coding an extended TMC message is to be shown as an example. The following message is a typical traffic report for a disturbance on a motorway:
A4 Olpe towards Cologne, between Bergisch-Gladbach Moitzfeld and Bergisch-Gladbach Bensberg 2 km of slow traffic ".

If this traffic announcement is coded hexadecimal according to the given standard, the following display results: 08 086E 2B74. This would be the information that would now be transmitted as a traffic message as a TMC message 13 in a packet 23. Due to the situation described in the traffic report in the exemplary embodiment, class 9 according to table 2 is best used as the class for the location information. This has the structure as shown in Table 3. Class d. Location information Mandatory packages (package types of location information) Optional packages (package types of location information 9 2,4,7,8,1,9,10, 3,5,6,12,14,15, 2 points, both outside a city 11.16. 18.19 1,9,10,11,16

Execution of the mandatory packages:

Element 2: Street class: 1

Element 4: Street number: 4

Element 7: Olpe

Element 8: Cologne

1. Element 1: ECC = E0, CC = D, LocDB # = 1; Locationcode = 2B74h

1. Element 9: P1.3

1. Element 10: Bergisch-Gladbach Moitzfeld

1. Element 11:20

1. Element 16: 007642312.051238721

2. Element 1: ECC = E0, CC = D, LocDB # = 1; Locationcode = 2B73h

2. Element 9: P1.3

2. Element 10: Bergisch-Gladbach Bensberg

2. Element 11: 19

2. Element 16: 007542342.051029628

Execution of the optional packages

Element 14: 50 (Since the U50 leads from Moitzfeld to Bensberg)

Element 19:40 (since the A4 is part of the E40).

Based on the information now available, it is not only possible to add a nagivation device with the necessary data transmitted, but the traffic announcement mentioned above can be clearly recovered without any information is stored in the radio receiver have to.

As additional information in further fields 15 and 16 can, for example, the location of the traffic jam and the end of the traffic jam, intermediate bases or the current one Loss of time can be transferred due to the maximum road traffic density. Furthermore are the event class as additional information transferable, or more detailed descriptions. Based on Event class it is then possible to view the traffic reports to sort according to different criteria.

Claims (8)

Method for transmitting digitally coded Traffic news, the traffic reports according to a standardized structure, especially according to the TMC process, are transmitted, characterized in that a header for the digitally coded traffic reports (13) (12) is prefixed and that the digitally coded Traffic report (13) at least one additional piece of information (14, 15, 16) follows, one of these pieces of information (14) contains a description of the location. A method according to claim 1, characterized in that the header (12) for encrypting the Traffic news serves. A method according to claim 1 or 2, characterized in that that the further information (14, 15, 16) in classes (20) are divided, with each class (20) one Class identifier (21) and at least 1 package (23, 24) having. A method according to claim 3, characterized in that the number of the following packets (23, 24) after the Class identifier (21) is transferred. A method according to claim 4, characterized in that each packet (23, 24) by type (26) and data (27) is determined. Method according to one of claims 2 to 5, characterized characterized in that by the class the number of Mandatory packages is set. Radio receiver to carry out the method according to a of claims 1 to 6, with a radio receiving part (2) with a separator of digital data and Voice information, with an evaluation circuit (5) Evaluation of digitally coded transmitted Traffic news, especially TMC news, and a computing device (6) for evaluating the digital received information. Radio receiver according to claim 7, characterized in that it has only one memory (7) for standard texts having.

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