EP1114406B1 - Method for coding congestion affecting several traffic lanes - Google Patents

Abstract

The invention concerns a method for coding congestion affecting several traffic lanes, in the context of digitally coded traffic information containing, in the form of elements, a site located on a traffic lane, and the size and direction of the congestion. Said data are decoded by a look-up table of sites. The method is characterised in that when a congestion is announced extending by its size beyond a branch road onto another traffic lane, another element is used for coding the following data: branch roads affected by the congestion, direction and size of the congestion.

Description

The invention relates to a method for coding cross-road traffic obstructions at digital encoded traffic messages, which as elements to one a street lying place and the extent and the direction contain the traffic obstruction and based on a Place table or a digital map to be decoded.

Such a construction and coding of Traffic reports are for example in the CEN EN12313-1 which is based on the standard proposal ALERT C, November 1990, published by the RDS ATT ALERT Consortium. Thus, with the Radio Data System (RDS) an additional and inaudible transmission of digital data in parallel with Radio programs in a data channel allows. The essential elements of a traffic announcement are the Location of the event and the event. This information is cataloged, that is, to everyone traffic-relevant location and every traffic-relevant event a unique code is assigned. The concatenation of places in a place table along existing roads gives the Course again. Except the usual facilities of one Receiver with an RDS decoder are for use of the Traffic message channel TMC (Traffic Message Channel) Facilities for decoding, storage, storage Further processing and output of traffic reports required.

Digitally coded traffic reports - for the sake of simplicity in the following also TMC messages called - can not only but with the help of the radio data system also for example within the digital audio broadcasting (DAB), especially in the FI channel (Fast Information Channel). Furthermore, a transmission of messages via Mobile networks provided, with the broadcast channel and the SMS channel are suitable (SMS = Short Message Service). to Time will be a Global Automotive Telematic Standard (GATS). This is a package-oriented Data channel parallel to the voice call can be handled. While in the broadcasting systems, that is, in unidirectional networks, one after the other TMC messages are sent to the bidirectional Networks a transmission on request (request) possible.

In a TMC message, only one location code is used transfer. To the end point of a traffic obstruction In addition, the direction and the Extent of traffic obstruction sent. The extent indicates how many sections of a road from the traffic obstruction are affected. The direction indicates in which direction the end point of the traffic obstruction lies. All concerned Places must be on the same street.

References to other roads are only that at the local level a link of the roads (Intersection Code) was created in the on the also in the Place code referenced place of the intersecting road becomes. This intersection code was previously only for Realization of navigation applications within the Location table and plausibility check of the location table Even traffic accidents affect more than one Street, these can only be done by the known method the generation of several messages - one for each of the affected roads - are coded, see z.ß. EP-A-795 974.

The object of the invention is to obstruct traffic on the Place table based to code so that even those Traffic disruptions that span more than one street extend, decode and in one easy by the user Recordable form can be reproduced.

This object is achieved in the method according to the invention solved by the fact that in case of reported traffic delays, which, because of their size, go beyond a turnoff extend to another street, through another Element is coded on which of the branching roads, in what direction and to what extent the reported Traffic obstruction extends.

The invention is applicable to branches and crossings, for describing the invention throughout the Expression diversion was used as an intersection as well can be considered as a multiple branch.

In the Europe-wide standardized TMC system, the inventive method be applied in that the digital coding of the traffic reports after the ALERT-C protocol takes place and that the additional element the label is 12.

By the invention, a higher proportion of existing traffic messages of a direct coding accessible. The messages generated in this way are opposite one Splitting the information on multiple messages easier detectable, usually reduce the required channel capacity and therefore increase the attractiveness of the RDS TMC system for Operator and user.

The method according to the invention is compatible with existing ones Terminals in the sense that no false information be generated. Recipients who do not evaluate the label 12 can receive a reduced amount of information about the cause of the fault and a portion of that of the Disruption affected routes.

Particularly advantageous is the application of the inventive method in the expansion of the RDS-TMC system on urban areas where Cross-road traffic delays are the norm are, thereby limiting the previously used protocol encounters.

An advantageous embodiment of the invention Method is that the data field of the label 12th three bits to select the adjacent to the junction Road on which the traffic obstruction stretches one bit for the associated direction and four bits for that direction Extent of extent on this road includes and that another eight bits for the same coding for the case are provided that the traffic is still over extends another road change. It can be preferably provided that when extending the Traffic obstruction over more than three roads for each two more streets encoded an additional label 12 and is transmitted. In this embodiment, the in the label 12 contained 16-bit data field in a particularly favorable manner exploited.

The invention further relates to a method for decoding of coded by the method according to the invention Traffic news, which is provided that in a with a place, a street, a direction and an extent provided for a traffic obstruction Traffic message the label 12 is evaluated such that from the intersection of the road coded in the traffic message starting with the road coded in the label 12 and in the direction indicated in the label 12 in the label 12th specified extent a place is determined which, in case that no further extension of the traffic obstruction in the Label 12 is coded, the end of the traffic obstruction means. Is the end of the traffic obstruction not on this road, it can proceed in this way, that when coding another street in the label 12 from the Place table along the further street the place of the end the traffic obstruction is read out.

Fig. 1

die Struktur des Labels 12 bei Durchführung des erfindungsgemäßen Verfahrens und

Fig. 2

einen Ausschnitt aus einer Straßenkarte zur weiteren Erläuterung des erfindungsgemäßen Verfahrens und dessen Vorteilen.

Embodiments of the invention are illustrated in the drawing with reference to several figures and explained in more detail in the following description. It shows:

Fig. 1

the structure of the label 12 in carrying out the method according to the invention and

Fig. 2

a section of a road map to further explain the method and its advantages.

Before entering the inventive method is on Example of FIG. 2, the coding of a traffic message after explained in the ALERT-C protocol. In Fig. 2, the Naming the crossroads and branches of simplicity half abbreviated, which is partly in the description was acquired. The map detail of FIG. 2 shows among other things the highway A37, which at the motorway triangle Hannover-Süd AD S begins, then in the B6 proceed. The federal highway B6 in turn goes to some Terminals MG, LS, WS at SK in the B3 on (the B6 kinks together with the B3 in the direction of the west), which then to the junctions BD, PT and WK in Hannover-Miesburg HM again leads to the A37 motorway. These crosses the A2 motorway at AK HB and later the A7 motorway, which leads south via AK HO, HA and AD HS.

Further, Fig. 2 shows sections of two others Federal highways B65 and B443. In particular, between AK HB and MG frequently incur traffic obstruction at trade fairs, which can not be coded in ALERT-C without complications.

For example, starts in the direction of south a traffic jam at the Junction Messegelände MG, whose end at the Autobahnkreuz Hannover-Buchholz AK HB is located, so is after the Prior art, the generation of three messages necessary, namely for the stope part of Seelhorster cross SK to exhibition grounds, for the part of the traffic jam of Hannover-Miesburg HM to Seelhorster cross MK and for the Remainder of the traffic jam from the motorway junction Hannover-Buchholz AK HB to Hannover-Miesburg HM. Apart from the fact that this one relatively large amount of data is required, these are three self-contained messages for the user relatively difficult to understand.

In the method according to the invention is now in addition to the traffic message contained in the first TMC group the in Fig. 1 schematically illustrated label 12 transmitted. This contains a three bit wide information SELECT1, the states on which of those in the primary group indicated intersection of adjacent roads the Traffic obstruction extends. It is called SELECT1 the ordinal number of roads connected with the intersection transferred in the counterclockwise direction. Followed by SELECT1 Bit D1, which is the direction in which the Traffic obstruction extends, and a four-bit wide Data word EXTENT1, which determines the extent of the Traffic obstruction on the selected one with SELECT1 Street indicates. The label 12 also contains the data words SELECT2, D2 and EXTENT2, with which in the same way a Extension of the traffic obstruction to another Crossing can be coded.

Ort:

B6, MG

Richtung:

Positiv

Ausmaß:

3

Ereignis:

stockender Verkehr

Such a coding according to the invention is explained below using the example of a traffic obstruction between AK HB and MG. The primary location for the traffic announcement is as the assumed traffic obstruction MG on B6. The first road change is at SK. Therefore, the first TMC group contains the following elements:

Place:

B6, MG

Direction:

positive

Extent:

3

Event:

slow-moving traffic

A recipient who still can not evaluate the label 12, will implement this as: "B6 Hannover direction Laatzen between Seelhorster Kreuz and the exhibition center faltering Traffic".

The remaining part of the traffic obstruction is now in the label 12 coded, wherein the elements in Fig. 1 in the lower Have line values. At SK the B6 meets on the B65 and the B3. The assignment of intersection codes takes place after ALERT-C counterclockwise: B6 SK points accordingly on B65 SK. For B65 SK is in the place table of Reference B3 SK stated. Accordingly, B3 SK in the inventive method as SELECT1 = 2 encoded. That I the traffic obstruction on the B3 to HM extends is D1 = 0 (positive) while the extent EXTENT1 = 4.

The fact that at least one of the remaining bits in Label 12 is not zero, the receiver recognizes that at HM is not the end of traffic obstruction. Because HM another crosses road, the A37 is again with SELECT2 = 2 coded. The direction is also positive, the remaining traffic obstruction extends only to another section, namely to AK HB, which is why EXTENT2 = 1. The receiver recognizes the absence of a further labels 12 that the end of the traffic obstruction is reached. The finished message can then be as follows be issued: "Hannover direction Laatzen between A37 AK Hannover-Anderten and B6 fairgrounds faltering Traffic".

Claims (6)

1. Method for coding multi-road traffic hold-ups for digitally coded traffic messages which contain, as elements, a location situated on a road and the extent and direction of the traffic hold-up and are decoded using a location table, characterized in that in the case of reported traffic hold-ups whose extent means that they cover another road beyond a turn-off, a further element codes which of the roads turning off, what direction and what extent the reported traffic hold-up covers.
2. Method according to Claim 1, characterized in that the traffic messages are cligitally coded on the basis of the ALERT-C protocol, and in that the additional element is the label 12.
3. Method according to Claim 2, characterized in that the data field of the label 12 comprises three bits for selecting the road which comes after the turn-off and is covered by the traffic hold-up, one bit for the associated direction and four bits for the extent of the coverage of this road, and in that a further eight bits for coding of the same type are provided for the situation in which the traffic hold-up also covers a further change of road.
4. Method according to Claim 3, characterized in that if the traffic hold-up covers more than three roads an additional label 12 is coded and transmitted for two respective further roads.
5. Method for decoding traffic messages coded using the method according to one of Claims 2 to 4, characterized in that in the case of a traffic message which is provided with a location, a road, a direction and an extent and relates to a traffic hold-up, the label 12 is evaluated such that, starting from the junction for the road which is coded in the traffic message, the road coded in the label 12 and the direction specified in the label 12 and the extent specified in the label 12 are used to determine a location which, if no further coverage of the traffic hold-up is coded in the label 12, signifies the end of the traffic hold-up.
6. Method according to Claim 5, characterized in that if a further road is coded in the label 12 then the location of the end of the traffic hold-up is read from the location table along the further road.

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