DE102004035983A1 - Method for transmitting digitally coded messages in data groups and receivers - Google Patents

Abstract

Method for transmitting messages comprising a plurality of data groups, in particular traffic-related messages, in digitally coded form, wherein in a first data group an indication of at least one further data group is transmitted, within which further data group supplementary information on basic information contained in the first data group is contained, wherein each additional information is associated with a 4-bit identifier for the type of supplementary information, characterized in that a further identifier are assigned further identification bits, which characterize additional types of supplementary information and DOLLAR A receiver for the evaluation of the method according to one of previous claims transmitted, with an evaluation device for detecting the particular identifier and for detecting the additional identifier, which by the particular identifier associated further identification sbits are assigned as well as for the assignment of the additional information type identified by the recognized combination of identifier and additional identifier. DOLLAR A The invention with the features of the independent claims allows the transmission and identification of more than the already normalized types of supplementary information, in particular more than 16 different types of supplementary information can be addressed and thus distinguished.

Description

State of technology

The The invention relates to a method of transmitting digital coding Messages in data groups and a receiver for reception and evaluation of these messages according to the preamble of the independent claims.

It is for example in DE 35 36 820 C2 and ISO 14819-1, -2 and -3 describe a method of coding traffic messages and transmitting such coded traffic reports. This transmission method, which has become known under the name TMC (= traffic message channel), is currently being implemented, for example, by broadcasting stations to broadcast traffic disruption messages. These radiate the coded traffic disturbance messages into data groups of the radio data system RDS (= radio data system) specified, for example, in ISO 50 067.

In ISO 14819-1 are in addition to a single data group comprehensive traffic reports also describes traffic messages that comprise several data groups, so-called multi group messages. Their structure and content is there in chapter 5 in detail described. Accordingly, it is envisaged that basic information, in particular the location and type of a traffic-relevant event in the first group of such a multi-group message become. In the at least one other group additional information Surpass the basic information contained in the first group. The type of supplementary Information is classified, with certain types of Additional information be identified by identifiers, so-called label. In ISO 14819 are for these identifiers or label provided exactly 4 bits, so there are at the most 16 different labels and thus addressable types of supplementary information, where already 15 of these 16 labels for certain supplementary information types are forgiven. Only Label 15 is not yet assigned. Thus would be according to the standard the address space is limited to a total of 16 types of supplementary information.

Advantages of invention

The Invention with the features of the independent claims allows the transfer and marking more than the already standardized types of Supplementary information in particular, more than 16 different types of supplementary information addressed and thus can be distinguished.

To is it inventively provided that a certain identifier associated with further identification bits are, which identify further types of supplementary information.

These Additional information can in particular, for example, additional length information on traffic events, such as congestion relate to which so far only lengths in the Transfer mileage range become. This length information are in the case of, for example, inner-city congestion for precise Marking the traffic event often too inaccurate. This is especially true for example, in the case of consideration these traffic reports for the calculation of driving or detour routes in vehicle navigation systems. The invention allows here advantageous the indication of lengths or expansions in different orders of magnitude, that is, for example in the 10 or 100 to 1000 meter range.

These Additional information can in particular, for example, to alternative lengths in the form of number of houses or development blocks refer, so that a traffic event is no longer in units of length but relative to a building or streets can be specified.

further developments and advantageous embodiments of the invention are specified in the dependent claims.

Advantageously, the address space extended in the manner indicated can be further extended to identify further supplementary information types, in that additional additional identification bits are assigned to a specific additional identifier formed by the further identification bits, which mark additional additional supplementary information. If, for example, additional 4 bits are used for the additional identifier, the additional identifier 15 or 1111 can, for example, contain an address space for further ones Additional identifiers of then, for example, again 4 bits in length span. By further cascading, the address space can be extended as part of a continuous standardization and definition of identifiers and additional identifiers for further future supplementary information types, whereby a downward compatibility is maintained.

drawings

embodiments The invention is illustrated in the figures and will be described below explained in more detail.

It demonstrate

1 the construction of a first group of the RDS signal in the case of a multi-group TMC traffic message

2 the construction of a second or further group of the multi-group TMC traffic message

3 a block diagram of a receiver according to the invention for processing transmitted by the inventive method multi-group messages using the example of a RDS radio receiver

4 a section from the pre-standard to ISO 14819-1 to explain the identifiers or label

description the embodiments

In 1 is the first group 10 a multi-group TMC message, which is transmitted by means of the radio data signal according to the RDS standard ISO 50 067 represented.

Basically, the radio data signal is composed of groups of different group types but of constant length of 104 bits each. One each group 10 . 20 , ... again comprises four blocks 11 . 12 . 13 and 14 each with 26 bits, each with the first 16 bits 111 . 121 . 131 . 141 of each block, the data word, the actual information, the remaining 10 bits 112 . 122 . 132 . 142 of each block 11 . 12 . 13 . 14 containing correction word, redundancy information for error detection and correction.

For the transmission of coded traffic reports according to the TMC standard ISO 14819-1, -2 and -3, the last 5 bits are X4, X3, X2, X1 and X0 of the data word 121 of the second block 12 and further all further bits Y15 to Y0 of the data word 131 of the third block 13 and all bits Z15 to Z0 of the data word 141 of the fourth block available.

Of the exact structure of such a traffic announcement is mentioned in the ISO standards and therefore need not be explained here. Of interest are in the present context primarily the bits Z15 to Z0, the include the location of a traffic event in the form of a location code. It is significant that certain places along a traffic route, So in particular motorway entrances and exits, rest areas, motorway junctions etc. encoded and in a location list, which also as "Location Table "is called, the concatenation of the encoded places among themselves the course of the Street represents.

Further Bits Y10 through Y0 give the type of event in coded form at. in the codes for Various events are already included lengths, for example Traffic jam 1km, traffic jam 2km, etc. Bits Y13 through Y11 give an extent of the traffic event in such a way that this over extends one or more coded locations along a street. Y14 is a heading bit which is along the direction of travel of the affected road section indicates.

The second and optionally further groups of a multi-group message have the in 2 shown construction. The basic structure is with that of in 1 identical and described above group. What is essential here is that for the supplementary information, first the bits Y11 bos Y0 of the third block 13 and bits Z15 to Z0 are available for additional information about the basic information contained in the first block. The first four bits Y11 through Y8 become standard identifiers 21 used for the type of additional information. According to the 1999 pre-norm, the labels have the in 4 given meanings.

Under "Label" is the identifier in decimal notation, followed by the length of the corresponding one Identification spanned data field and under "Type of Information" in each case the meaning or type of supplementary information contained in the data field specified. Label 0 thus spans, for example, data field of length 3 bits in which information about the duration of the traffic jam in encoded form, label 10, however, for example a data field of 16 bits in length, in the detailed information about the bypass in the first block coded traffic incident are included.

opposite this illustration is also label 12 in the current version of Norm already awarded for Details, at which point on a by a location code and the Driving direction defined section of the route the traffic event exactly located.

According to the invention, the not yet assigned identifier 15 used an address space for other identifiers 22 to span. In the example of 2 This additional address space can comprise further 4 bits Y7 to Y4, which already belong to the actual data field for the supplementary information in the labels 0 to 14.

It can therefore 16 more identifiers 22 are defined, which can accordingly define 16 additional types of supplementary information. According to the advantageous embodiment proposed here, only 15 of the 16 further identifiers are used to identify further types of supplementary information, whereas the 16 th of the further identifiers spans a further address space for second further identifiers. This form of cascading is basically continued until the available bits Y7 through Z0 are exhausted.

In 2 follows the further identifier 22 the data field defined by this 23 with here, for example, 5 bits in length, ie with the data bits Y3, Y2, Y1, Y0 and Z15. This is followed by another data free space 24 with the bits Z14 to Z0 of the fourth block 14 which, as provided in the ISO 14819 specification, can be used for other additional information.

By combining the identifier 15 With the further identifier according to the invention, for example, the following additional information can be addressed.

Length information about traffic events transmitted in the first group of the multi-group message can be specified in more detail with this supplementary information. For example, in the case of urban traffic events, messages may include a message of content
"Traffic jam three blocks between intersection A and intersection B"
or
"10 km of congested traffic 10km starting 500m before AS B on highway X between AS A and AS B"
be coded.

The message would be in the second group, the identifier 21 or the label 15 include, further the further identifier 22 with the content 0 or 1 and finally the corresponding supplementary information in coded form in which by the combination of label 15 and the corresponding further identifier 22 defined data field 23 ,

In 3 is a recipient 50 for receiving and evaluating from a transmitter 70 emitted coded traffic reports. In the present case, for example, without restriction of the general public is an RDS radio receiver.

This has a receiving antenna 51 to the reception of the radio station 70 radiated broadcast signal 71 on. The antenna signal is received in a receiver 52 demodulated in a conventional manner. The resulting multiplex signal contains audio signal information in subsequent stages 54 decoded and output via loudspeakers. The multiplex signal also contains the RDS signal, which is in an evaluation circuit 55 is evaluated. The traffic messages contained in the RDS signal are isolated and stored in a memory 60 stored decoding information decoded and converted into outputable eg font data or audio data. These are in memory 60 the codes 61 . 62 . 63 . 69 assigned corresponding outputable information 71 . 72 . 73 . 79 filed, so by addressing the memory 60 with the received codes corresponding outputable information can be read out.

In the storage room 60 In addition, the assignment of the TMC labels contained in the described manner in the RDS signal to supplementary information types and the assignment of the codes contained in the data field for additional information to the outputable supplementary information is stored. For example, the memory contains 60 according to the above listing the assignment Label "15" + further identification "1" - additional length information in meters such as Code "0" (for additional length information) - 1 meter or Label "15" + additional identifier "0" - additional length in blocks such as Code "1" - 2 blocks.

By decoding the basic information of the first group 10 and the supplementary information of the second group 20 generates total message, for example, on a display 56 of the device.

Alternatively or additionally, the radio receiver 50 with a car navigation system 57 be connected or it may be an integrated device 50 act in which both a radio receiver and a navigation system functionality 57 available. This can be fed from the received information derived traffic message information, which are used for a dynamic route calculation, ie a route calculation with congestion avoidance and / or other consideration of traffic disruptions.

Claims (6)

Method for transmitting messages comprising a plurality of data groups, in particular traffic-related messages, in digitally coded form, wherein in a first data group an indication of at least one further data group is transmitted, within which further data group supplementary information on basic information contained in the first data group is contained, wherein each additional information is associated with a 4-bit identifier for the type of additional information, characterized in that a further identifier is associated with further identification bits, which identify further types of supplementary information. Method according to claim 1, characterized in that that of a particular one formed by the further tagging bits Additional identifier additional additional identification bits are assigned, which additional additional information mark. Method according to one of the preceding claims, characterized characterized in that the identifier comprises 4 bits. Method according to one of the preceding claims, characterized in that the particular Identifier corresponds to the decimal value 15 or the binary value 1111. Method according to one of the preceding claims, characterized in that the messages are messages after TMC standard. receiver for the evaluation of according to the method according to one of the preceding Claims transferred Messages, with an evaluation device for detecting the particular Identification and recognition of the additional identifier, which by the assigned to certain identifier associated further identification bits are as well as for the assignment of the by the recognized combination Identification and additional identifier marked supplementary information.