KR101131857B1 - Method and apparatus for providing information of speed on links and using the information - Google Patents

Abstract

The present invention relates to a method and apparatus for providing traffic information on a road, in particular information about an average speed of a road section, and using the provided information. In the method for providing traffic information as a radio signal according to the present invention, a message segment constitutes a continuous message sequence and is wirelessly transmitted, wherein at least one segment of the message segments corresponds to an average speed of a road section. And a state component with information, said information comprising a value expressed in units of speed lower than 1.8 km / h, for example in units of 1 km / h.

Traffic information, section, average speed, 8 bit, TPEG

Description

Method and apparatus for providing information of speed on links and using the information

1 is a diagram briefly illustrating a network in which traffic information is provided according to the present invention;

2 illustrates a format for providing traffic information transmitted wirelessly;

3 shows a structure of congestion traffic information included in a CTT event container,

4A-4C show the segment mean velocity, segment pass time, and syntax of the latency diagrams, respectively, shown in the state component in the CTT event container of FIG.

5a to 5c respectively show the structure of the state components for transmitting the average speed of the road section according to a preferred embodiment of the present invention,

6 illustrates a configuration of a navigation terminal according to an embodiment of the present invention mounted on a vehicle or the like for receiving traffic information transmitted from a server,

7A to 7B illustrate various types of displaying average speeds for respective road sections,

8 is an example in which the average speed for a portion of a road section is displayed on a screen with more accurate resolution than 1.8 km / h according to one embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: tuner 2: demodulator

3: TPEG-CTT decoder 4: storage

5: navigation engine 5a: memory

6: LCD drive 7: LCD panel

8: GPS module 9: input

100: server

The present invention relates to a method and apparatus for providing information on traffic conditions on a road and using the provided information.

Today, with the development of digital signal processing and communication technology, radio and TV broadcast signals that provide content wirelessly are gradually provided in the form of digital data. By providing the signal in digital form, it is possible to provide a variety of information to the TV or radio broadcast signal, such as news, securities, weather and traffic information.

In particular, with the increase of vehicles in the city center and the increase of holiday vehicles such as holidays, the necessity of traffic communication information on the road is increasing day by day. For this reason, a method of providing road traffic information as additional information through satellite broadcasting and terrestrial broadcasting is being developed.

However, the provision of such traffic information requires a unified standard because many terminals having different manufacturers must be able to detect broadcast digital traffic information and interpret the same and provide the same to the user.

It is an object of the present invention to provide a method for more precisely providing traffic information, in particular, an average speed for a road section, to a driver driving on a road.

Another object of the present invention is to provide a method and apparatus for using traffic information provided more precisely.

In the method for providing traffic information according to the present invention for achieving the above object by a wireless signal, the message segment is composed of a continuous message sequence and sent out wirelessly, at least one segment of the message segment, road section It includes a state component having information on the average speed, characterized in that the information includes a value expressed in units of speed lower than 1.8km / h.

In one embodiment according to the invention, the size of the information is one byte.

In one embodiment according to the present invention, the information includes a 1-bit indicator that designates one of a plurality of predetermined speed units.

In one embodiment according to the invention, the speed unit is 0.9 km / h.

In another embodiment according to the invention, the speed unit is 1 km / h.

In another embodiment according to the present invention, the specified plurality of speed units is 0.5 km / h and 1 km / h.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, a method of providing traffic information as a radio signal according to the present invention will be described. 1 is a simplified diagram illustrating a network in which traffic information is provided according to the present invention. In the network of FIG. 1, for example, the traffic information providing server 100 of a broadcaster is collected from various paths, for example, operator input, another server or a probe car via the network 101. Various traffic information is reconstructed and wirelessly transmitted so that a traffic information receiving terminal, for example, a navigation device, mounted on the vehicle 200 can receive the traffic information.

The traffic information providing format transmitted by the traffic information providing server 100 wirelessly includes a sequence of message segments (hereinafter, referred to as 'TPEG (Transport Protocol Export Group) messages') as shown in FIG. 2. One message segment of the sequence, that is, the TPEG message, is composed of a message management container 21, a Congestion and Travel-Time Information (CTT) event container 22, and a TPEG-CTT location container 23. The TPEG message 30 for conveying traffic information other than the CTT event is also included in the sequence.

The message management container 21 includes information such as a date and time and a time when a message is generated. The CTT event container 22 generates current traffic state information and traffic prediction information of each link (road section). It is included. The TPEG-CTT location container 23 generates and includes location information about a link.

The CTT event container 22 and the TPEG-CTT location container 23 are both composed of CTT components, and a congestion traffic information component having an identifier of 0x80 (hereinafter, referred to as a 'CTT component') is a section average. It is composed of state components carrying information about speed, section passing time, and tardiness, and belongs to the CTT event container 22. A CTT component having an identifier of 0x90 is a coordinate component carrying road type or road coordinate information. And belong to the TPEG-CTT location container 23.

3 is a syntax for the structure of a CTI component belonging to a CTT event container. As mentioned above, the CTT component is assigned an identifier '0x80' (3a), includes m state components (3c), and has a field 3b representing the total data length of the included state component in bytes.

In each state component, as mentioned above, information on the interval average speed of 8 bits, the interval passing time of 8 bits, and / or the delay diagram is carried in the format shown in FIGS. 4A to 4C. Identifier '00' is assigned to the speed, '01' to the passage time, and '03' to the delay diagram.

In the section average speed field 41, a value expressed in units of 0.5 m / sec (1.8 km / h) is displayed, and in the section passing time field 42, a value expressed in minutes is displayed. Information about the section passing time, the length of the section in the information (section length, lane width, etc.) DB for each road section (hereinafter, also referred to as 'link') currently built in the server 100, Divided by the average speed of the section for the section obtained by the traffic information collected through the various paths and rounded up by the minute unit (for example, 30 seconds or more converted into 1 minute) is provided.

However, when the average speed of the section is expressed in units of 0.5m / sec (1.8km / h) and transmitted, the range of speed that can be expressed in 8 bits is 0 to 459km / h. It is not necessary to express it at a high speed, for example 200 km / h or more. This is because traffic laws do not allow speeds of more than 200 km / h, and the average speed approaching 200 km / h means that there are very few vehicles in the area and that the driver can speed as much as they want. to be. In other words, a very high speed, for example, an average speed of 200 km / h or more, is not merely a matter of road section but a situation in which the driver's speeding in the section is expressed. Therefore, it is unnecessary to provide information indicating a very high speed in view of the purpose of providing traffic information of the road.

In addition, under traffic congestion, a difference of 1 km / h in the average speed of the road may be an important judgment basis for the driver's choice of road segment.The resolution of the speed information of 1.8 km / h can express a difference of 1 km / h. I can't. Therefore, when the average speed on the road section is low speed, the average speed information expressed in units of 0.5 m / sec (= 1.8 km / h) does not provide the information of the precision required by the driver.

Thus, in a preferred embodiment according to the present invention, when conveying information about the average speed of the sections, the maximum speed is lower than the previous example (459 km / h) and instead more to increase the precision of the expression at low speed. Pass using the lower representation unit. Preferably, as in FIG. 5A, a speed unit of 0.25 m / sec (= 0.9 km / h) is used. Using this unit, the maximum speed that the average speed field 51 of 8 bits can represent is 229.5 km / h.

Of course, a unit of 0.25 m / sec is also an example, and a lower speed, for example 0.2 m / sec (maximum expressable speed is 183.6 km / h) to increase the resolution of the speed on a low speed road. Or 0.15 m / sec (the maximum expressible speed is 137.7 km / h). It is advantageous to lower the expression unit to further increase the resolution of the speed information in the low speed state in the case of limiting the maximum speed on the road to, for example, 110 km / h. Because providing an average speed higher than the speed limit as the current average speed for the road segment is unreasonable and may not be acceptable for traffic safety.

Unlike the above embodiment, as shown in Figure 5b, the average speed information for the road section may be provided based on the km / h familiar to the driver. According to this embodiment, the speed range that the speed information transfer field 52 can represent is 0 to 255 km / h, and no digits after the decimal point occur. The embodiment of FIG. 5B reduces the maximum representable speed (459 km / h-> 255 km / h), compared to the example of FIG. 4A, but the resolution of the speed expression is 0.8 km / h (1.8 km / h-> 1 km /). h).

The resolution of the speed information can be relatively important depending on the magnitude of the average speed of the current road section. As mentioned above, if the average speed of the current road segment is low, the driver will be sensitive to slight average speed changes, and if the average speed of the current road segment is high, it will be insensitive to slight average speed changes. Therefore, in another preferred embodiment of the present invention, the speed expression unit is used variably according to the magnitude of the speed. Fig. 5C specifically shows the structure of the average speed field of the state component according to this embodiment, where the highest flag F designates the speed size in units of the speed expression value Speed_Value of 7 bits or less. For example, if the highest flag F is 0, the following 7-bit value (Speed_Value) is a speed expressed in units of 0.5 km / h. If the highest flag F is 1, the 7-bit value (Speed_Value) is It represents the speed expressed in units of 1 km / h.

In the embodiment of FIG. 5C, since the maximum speed that can be expressed in units of 0.5 km / h (in case of F = 0) is 63.5 km / h (= 127 * 0.5 km / h), the highest flag F is 1 In this case, 63.5 km / h is added to the speed indicated by the 7-bit value (Speed_Value) below the speed information to provide the value through the average speed field. For higher speeds, instead of 63.5 km / h for integer representation, you can add 63 km / h, the speed of the nearest integer. For example, if the average speed field is 1: 0001100, the average speed to be transmitted is 759.5 km / h (= 12 km / h + 63.5 km) or 759 km / h (= 12 km / h + 63 km).

Of course, in the embodiment of Figure 5c, the resolution of the speed expression divided into 0.5km / h and 1km / h is just one example, it is also possible to use a different resolution than the presented unit. Therefore, the invention using different resolutions according to the magnitude of the average speed of the road segment should be regarded as belonging to the scope of the present invention even if the unit of resolution differs from the examples presented in the present invention.

6 illustrates a configuration of a navigation terminal according to an embodiment of the present invention, mounted on a vehicle or the like, for receiving traffic information transmitted from the server 100. The terminal of FIG. 6 includes a tuner 1 for tuning a signal band provided with traffic information to output a modulated traffic information signal, a demodulator 2 for demodulating the modulated traffic information signal, and outputting a traffic information signal; TPEG-CTT decoder (3) to decode the demodulated traffic information signal to obtain various traffic information, GPS module (8) to determine the current position (longitude, latitude, altitude) by receiving satellite signals transmitted from a plurality of low-orbit satellites ), An electronic map containing information about each link and node, and a storage means (4) for storing various graphical information, an input (9) for receiving user input, the user's input, current location and traffic obtained A navigation engine 5 for controlling the screen output based on the information, a memory 5a for temporarily storing necessary information, an LCD panel 7 for displaying an image, and a driving signal corresponding to a graphic to be displayed. An LCD drive 6 applied to the LCD panel 7 is included. The input unit 9 may be a touch screen provided on the LCD panel 7.

The tuner 1 tunes a signal transmitted from the server 100, and the demodulator 2 demodulates and outputs the tuned signal in a predetermined manner. Then, the TPEG-CTT decoder 3 decodes the input demodulated signal into a TPEG message sequence configured as shown in FIG. 2, and then interprets each TPEG message in the sequence to provide necessary information and / or control according to the content of the message. The signal is transmitted to the navigation engine 5. Although various information and / or control signals are transmitted from the TPEG-CTT decoder 3 to the navigation engine 5, the present invention provides a section average of traffic congestion information of FIGS. 2 and 3, 4A, and 5A to 5C. As it relates to the speed, the following description focuses on the processing thereof, and other information and / or control signal processing is not directly related to the present invention, and thus description thereof will be omitted.

The TPEG-CTT decoder 3 extracts a date / time and a message occurrence time in the message management container of each TEPG message, and determines whether a subsequent container is a CTT event container from the information of the 'message element'. If it is a CTT event container, the information obtained from the container is transferred so that the display operation according to the traffic congestion information described later is performed by the navigation engine 5. In addition, location information corresponding to the currently transmitted communication information is obtained from a subsequent TPEG-CTT location container, which is the location coordinates of the start point and the end point according to the type information of the TPEG-CTT location container. (Longitude and latitude) or a link, that is, a link ID assigned to a road segment. When the storage means 4 is provided, the section corresponding to the received information is specified by referring to the information on each link and the node stored in the storage means 4, and the navigation engine 5 If necessary, also converts the position coordinates of the received link into a link ID and vice versa.

On the other hand, the navigation engine 5 reads a portion of the electronic map required from the storage means 4 centering on the current position coordinates received from the GPS module 8 and through the drive 6 through the LCD panel ( 7). At this time, a specific graphic symbol is displayed at the point corresponding to the current position.

In this state, the navigation engine 5 sends the section average speed information received from the TPEG-CTT decoder 3 to a section corresponding to the position coordinate or link ID of the location container following the container carrying the information. In this display method, the color is changed according to the average speed of the section as shown in FIGS. 7A (map display) and 7B (graphic display). ~ 10km, orange is 10-20km per hour, green is 20-40km per hour, blue is 40km per hour). If the user requests the display of the average speed of the sections on the driving route, the navigation engine 5 is located in front of the currently traveling route among the section average speed information received from the TPEG-CTT decoder 3. The section average speed information for the section (if the driving route is set, the section belonging to the route) is displayed in a graphic screen as shown in FIG.

FIG. 8 shows the corresponding field according to the preset resolution (0.9 km / h of FIG. 5A) when the average speed of each section is provided more precisely than the resolution 1.8 km / h (for the embodiment of FIGS. 5A to 5C). The section average speed obtained by multiplying the values shown in the above is an example displayed on the LCD panel 7. FIG. Since the resolution is 0.9km / h, the difference between the average speeds is 0.9km / h (A marked area) or multiples between adjacent sections (A marked area). Of course, when the average speed information represented by another predetermined resolution (1 km / h of Figure 5b or 0.5 km / h and 1 km / h of Figure 5c) is received, the difference in the average speed in multiples of the resolution between the adjacent sections.

The reason why the average speed of the section is displayed by switching to the graphic screen is that the driver cannot easily recognize the average speed of the section when the numerical value is displayed on the map. The average speed may be displayed on the omni-directional or routed road segment.

According to the embodiment of Figs. 5a to 5c according to the present invention, even if the average speed for the road section shows a difference of 1 km / h or less, it is displayed separately by the numerical value on the screen, the driver based on the information Alternatively, the road segment to be driven may be selected based on the passage time obtained by dividing the length of the road segment by the average speed having its precision.

In order to simplify the screen display, the average speed of the section may be discarded and displayed below the decimal point according to the user's selection.

On the other hand, when the terminal of FIG. 6 is provided with a voice output means, it is also possible to output the received average speed information and the like for a designated section or a section on the driving route as a voice.

As mentioned above, preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and those skilled in the art can improve other various embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. Changes, substitutions or additions will be possible.

The present invention described in detail above allows a driver of a vehicle running in a large city with heavy traffic to reach a desired destination in a shorter time by using the predicted traffic information of the road, and also appropriately distributes the traffic volume. As a result, efficient use of road resources can be attained. Moreover, by providing more precise average speed of the road segment, the driver can select a shorter driving route.

Claims (16)

An apparatus for processing traffic data including a TPEG (Transport Protocol Expert Group) message, Receiving unit for receiving traffic information; And A decoder which decodes the received traffic information; Including, The traffic information is A message management container including time information, date and time information of the TPEG message; An event container including traffic state information of a road; And A location container containing location information of the roadway; Traffic information processing device comprising a. The method of claim 1, The traffic state information is A section average speed component including average speed information of the roads; A segment transit time component comprising transit time information of the roadway; And A congestion diagram component comprising congestion information of the roadway; Traffic information processing device comprising a. The method of claim 2, The interval average speed component includes a first identifier, the interval passage time component includes a second identifier different from the first identifier, and the latency diagram component is a third identifier different from the first and second identifiers. Traffic information processing device that includes. The method of claim 2, And the average speed information includes a value expressed as a speed unit lower than 1.8 km / h. The method of claim 4, wherein And the average speed information has a size of 1 byte. The method of claim 2, And the average speed information includes an indicator for designating one of a plurality of predetermined speed units. The method of claim 6, And the indicator is one bit. The method of claim 6, The speed unit is a traffic information processing device, characterized in that the value in the range of 0.5km / h ~ 1.0km / h. A method of processing traffic data including a TPEG (Transport Protocol Expert Group) message, A receiving step of receiving traffic information; And A decoding step of decoding the received traffic information; Including, The traffic information is A message management container including time information, date and time information of the TPEG message; An event container including traffic state information of a road; And A location container containing location information of the roadway; Traffic information processing method comprising a. The method of claim 9, The traffic state information is A section average speed component including average speed information of the roads; A segment transit time component comprising transit time information of the roadway; And A congestion diagram component comprising congestion information of the roadway; Traffic information processing method comprising a. 11. The method of claim 10, The interval average speed component includes a first identifier, the interval passage time component includes a second identifier different from the first identifier, and the latency diagram component is a third identifier different from the first and second identifiers. The traffic information processing method that includes. 11. The method of claim 10, The average speed information comprises a value expressed in units of speed lower than 1.8km / h. 13. The method of claim 12, The size of the average speed information is a traffic information processing method, characterized in that 1 byte. 11. The method of claim 10, And the average speed information comprises an indicator for designating one of a plurality of predetermined speed units. The method of claim 14, And the indicator is one bit. The method of claim 14, The speed unit is a traffic information processing method, characterized in that the value in the range of 0.5km / h ~ 1.0km / h.

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