EP1264295A1

EP1264295A1 - Method for transmitting location-related information between a control centre and a mobile terminal, a mobile terminal and a control centre

Info

Publication number: EP1264295A1
Application number: EP01913662A
Authority: EP
Inventors: Arnold Gieseke; Martin Hans; Gunnar Schmidt; Dieter Thoms; Frieder Mundt
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2000-03-03
Filing date: 2001-02-16
Publication date: 2002-12-11
Anticipated expiration: 2021-02-16
Also published as: DE10010436A1; EP1264295B1; JP2003525459A; WO2001065522A1; US6960997B2; DE50102206D1; US20030164779A1

Abstract

The invention relates to a method for transmitting location-related information between a control centre (1) and a mobile terminal (5) and to a mobile terminal and a control centre that allow the position of the mobile terminal (5) to be tracked, or a navigation application to be performed on a display device of said mobile terminal (5). The mobile terminal (5) refers, in particular to a mobile telecommunications terminal. In a first step, the position of the mobile terminal (5) is determined and transmitted to the control centre (1). In a second step, location-related information for the mobile terminal (5) is created in the control centre (1), in accordance with the position of the mobile terminal (5) that has been determined. In a third step, the location-related information is transmitted from the control centre (1) to the mobile terminal (5). In a fourth step, the location-related information that has been received is issued to a reproduction device (10) of the mobile terminal (5) in order to be reproduced.

Description

Process for the transmission of location-based

Data information between a central office and a mobile terminal, mobile terminal and central office

State of the art

The invention is based on a method for transmitting location-related data information between a central and a mobile terminal, a mobile terminal and a central according to the category of the independent claims.

Process for the transmission of location-based

Data information between a central office and a mobile terminal device is already known and is used, for example, in the localization of mobile radio devices in a cellular mobile radio network.

With the help of GPS technology (Global Positioning System), location determination is possible down to an accuracy of 10m. This system is used, for example, to determine the location of ships and motor vehicles, such as the "Travel Pilot" from Blaupunkt. The location information is always entered in a locally existing map material that is located on a data carrier, such as a compact disc The location information is used, for example, to calculate the route and to guide the user to a desired destination. The H .32x procedures standardized by the ITU-T (International Telecommunication Union) are used for the transmission of audio, video and data information via fixed and mobile networks. The main area of application is video telephony between two or more terminals. These standards have recently been increasingly used for the transmission of multimedia information, such as live camera images or for TV transmission, for example via the TV ew info server of Deutsche Telekom.

Currently available mobile phones, e.g. the Nokia 9000 mobile phone, and PDAs (Personal Digital Assistant), e.g. the Apple Message Pad, have sufficiently large displays for displaying map material. Due to the limited storage space available in the aforementioned mobile devices, mobile phones are currently only used as a voice terminal, as an access interface to the Internet and for sending text messages, for example electronic mail on the Internet or short messages according to the SMS standard (Short Message Service).

Advantages of the invention

The method according to the invention for the transmission of location-related data information, the mobile terminal according to the invention and the central according to the invention with the features of the independent claims have the advantage that in a first step a position of the mobile terminal is determined and transmitted to the central that a second Step m of the control center m depending on the determined position of the mobile terminal, location-related data information for the mobile terminal is formed, that m the location-related data information from the control center to the mobile terminal are transmitted and that in a fourth step the received location-related data information is reproduced on a playback device of the mobile terminal. In this way, location-related data information, such as a

Realize the location of the mobile device by means of a geographic map or a route proposal for a navigation application, regardless of the storage space and computing capacity available in the mobile device, so that the functionality and use of the mobile device, in particular if it is designed as a mobile phone or PDA, is considerably increased ,

The measures listed in the subclaims allow advantageous developments and improvements to the method for transmitting location-based data information, the mobile terminal and the control center in accordance with the independent claims.

It is particularly advantageous that in the second step m of the control center, a section is selected from a geographical map that includes the determined position of the mobile terminal, that in a third step the selected map section is transmitted from the control center to the mobile terminal and that m in a fourth step, the transmitted map section with the determined position is reproduced on a reproduction device of the mobile terminal.

In this way, the map material can be kept centrally at the central office, for example in a navigation server, and can be updated there quickly and easily, with an update carried out in the central office benefiting many users of corresponding mobile terminals. Due to the central storage, storage space is m End devices saved and multiple storage of the map material prevented.

It is particularly advantageous that on the mobile device

Destination is specified and transmitted to the control center, that a route proposal between the determined position of the mobile terminal and the specified destination is calculated in the control center, that the route proposal is transmitted from the control center as additional information to the mobile terminal, and that the route proposal is sent to the playback device of the mobile terminal is played. In this way, the mobile device can be used for navigation and route guidance, so that its functionality is increased. When the mobile device is designed as a mobile phone or a PDA, this results in a navigation device that can also be used by pedestrians and cyclists.

Another advantage is that the selected map section by a compression method, in particular using one of the

Image compression method H.261 and H.263 according to the ITU-T standard H.32x (International Telecommunication Union), coded is transmitted to the mobile device. In this way, bandwidth can be saved in the transmission of the map section from the center to the mobile terminal, so that the map material can be transferred from the center to the mobile terminal even with a limited bandwidth of a mobile radio network used as a transmission medium.

Another advantage is that in a fifth step a new position of the mobile terminal is determined and transmitted to the center, and in a sixth step m a new map section is sent to the center is selected, which includes the new position of the mobile terminal device, that in a seventh step image data m are transmitted as a function of differences between the selected new map section and the previous map section from the control center to the mobile terminal device and that in an eighth step the previous map section m Dependency of the transmitted image data is updated on the display device of the mobile terminal. In this way, when the map section displayed on the playback device of the mobile terminal is updated, a completely new map section does not always have to be transmitted from the control center to the mobile terminal, but only changes indicating image data indicating changes between the previous map section and the new map section. Especially when the new map section contains part of the previous map section, this method leads to a transmission of the image data required to update the previous map section that requires little bandwidth. Such an update can then also be carried out particularly quickly.

Such a bandwidth-saving method for transmitting image data from the control center to the mobile terminal, which are used to update the map section reproduced on the playback device of the mobile terminal, can be realized by selecting the new map section in the sixth step, in particular using a the image compression methods H.261 and

H.263, the previous map section is broken down into individual image blocks, so that a motion vector is calculated for each of the image blocks depending on the change in position from the previous position to the new position of the mobile terminal, starting from the previous one Map section and the motion vectors of the new map section is estimated that the estimated map section is compared with the new map section by forming the difference, so that a difference image is created that with the image data in the seventh step

Difference image is transmitted to the mobile terminal device, that in the seventh step the motion vectors are also transmitted from the control center to the mobile terminal device and that in the eighth step the map section to be reproduced on the playback device is calculated from the previous map section by moving the previous map section block by block using the motion vectors and the shifted map section formed in this way is overlaid with the difference image. The transmission of the difference image and the motion vectors requires less bandwidth and is faster than the transmission of the completely new map section from the control center to the mobile terminal. In addition, a method already used for image telephony, for example the standardized H .32x method, can be used for the transmission of the image data, so that the scope of such a method is enlarged and no new method is required for the transmission of the map material.

Another advantage is that at the specified times in the seventh step with the image data the new map section is transmitted from the control center to the mobile terminal and in the eighth step the new map section with the new position at the

Playback device is brought to play. In this way it is possible, at regular intervals, to adapt the reproduction of the map material on the mobile terminal to the original map material and thus an accumulation of transmission errors during the transmission of the Difference image and the motion vectors that can lead to a falsification of the map material to be reproduced.

It is particularly advantageous that when selecting the new map section in the sixth step map areas that are only contained in the new map section and not in the previous map section are determined, that in the seventh step the map areas determined are transferred from the central station to the mobile terminal device with the image data and that in the eighth step the map section to be reproduced on the playback device is calculated from the previously displayed map section by moving the previously displayed map section by means of an overall movement vector calculated from the previous position to the new position of the mobile terminal device due to the change in position and the shifted map section formed in this way is supplemented by the transferred map areas. In this way, bandwidth is also saved in the transmission of the image data required to update the map section previously displayed on the playback device from the center to the mobile terminal, since only the changing map areas need to be transmitted from the center to the mobile terminal. Map areas that are contained in both the previous and the new map section do not have to be transferred. The transmission of the image data required to update the map section previously displayed on the playback device can therefore also take place particularly quickly and is faster, the less the new map section deviates from the previous map section, since the fewer additional map areas then have to be transmitted from the central office to the mobile terminal , By transferring original map areas from the There is also no accumulation of transmission errors central to the mobile terminal, as can be the case, for example, with the successive transmission of interference images. Regular transmission of a complete new map section to limit such accumulating transmission errors is therefore not necessary. Furthermore, no calculation of a difference image and no estimation of the new map section m of the control center is required, so that computational effort and computing time m of the control center can be saved compared to the previously described method. An update of the map section to be played back on the playback device of the mobile terminal is therefore possible all the faster.

The image data to be transmitted for updating the map sections to be reproduced on the playback device of the mobile terminal can also advantageously save bandwidth and transmission time by a compression method, in particular using one of the

Image compensation methods H.261 and H.263 according to the ITU-T standard H.32x, coded to be transmitted to the terminal.

Another advantage is that in the first step, information about the size of the map section that can be displayed on the display device is transmitted from the mobile terminal to the control center. In this way, the size of the map section transmitted from the center to the mobile terminal, the size of the difference image or the

The size of the additional map areas to be transmitted for the update of the map section to be reproduced is already adapted in the control center to the size of the map section which can be reproduced on the playback device. In this way the transmission becomes too a lot of image data and therefore the excessive use of bandwidth and transmission time prevented.

Another advantage is that the position of the mobile terminal is specified on an input device of the mobile terminal. In this way, the user of the mobile terminal can enter any position and in this way request any map sections from the center for playback.

drawing

Exemplary embodiments of the invention are shown in the drawing and explained in more detail in the description below. FIG. 1 shows a block diagram of a control center according to the invention and a mobile terminal according to the invention for carrying out a method according to the invention for transmitting location-related data information, and FIG. 2 shows a flowchart for

Description of the general sequence of the method according to the invention, FIG. 3 a flowchart for describing a part of the general sequence according to a first embodiment and FIG. 4 a flowchart for describing a part of the general sequence plan according to a second embodiment.

Description of the embodiments

In FIG. 1, 5 denotes a mobile terminal device, which can be designed, for example, as a cell phone or as a PDA (Personal Digital Assistant). The mobile terminal 5 comprises a first transmitting / receiving antenna 70 which is connected to a first antenna unit 60. The first transmitting / receiving antenna 70 is used to send and receive data via a mobile radio network 85. The first antenna unit 60 is connected to a first evaluation unit 35 in the receiving direction via a first receiving unit 30. The first evaluation unit 35 is connected to the first antenna unit 60 in the transmission direction via a first transmission unit 25. A location receiver 15 is also connected to the first evaluation unit 35, which can be designed, for example, as a GPS receiver (Global Positioning System) and to which a receiving antenna 80 for receiving location data connected. This receiving antenna 80 for location data can be designed, for example, as a GPS patch antenna. In this example, an input device 20 and a playback device 10 are also connected to the first evaluation unit 35. The reproduction device 10 comprises a display device, for example in the form of a liquid crystal display, and can optionally additionally comprise one or more loudspeakers for acoustic reproduction.

Via the mobile radio network 85, the mobile terminal 5 exchanges location-related data information with a center 1, which comprises a second transmitting / receiving antenna 75 connected to a second antenna unit 65. The second antenna unit 65 is connected in the reception path via a second reception unit 40 to a second evaluation unit 50. The second evaluation unit 50 is connected in the transmission path via a second transmission unit 55 m t of the second antenna unit 65. The control center 1 also includes a memory 45 which is connected to the second evaluation unit 50.

The method according to the invention is now explained in more detail using a flow chart according to FIG. 2. At a

Program point 100, the first evaluation unit 35 determines a position of the mobile terminal 5. The position determination can be carried out, for example, in two different ways. According to a first type, the position of the mobile terminal 5 is determined by the reception of

Location data determined via the receiving antenna 80 for location data and the location receiver 15 of the first evaluation unit 35. According to a second type, it can optionally be provided that the user of the mobile terminal 5 has an arbitrary position on the input device 20 pretends to view any map section. Subsequently, the first evaluation unit 35 causes the first transmission unit 25 to emit the position of the mobile terminal 5 determined in one of the two above-mentioned ways by means of a corresponding location data signal from the first transmission / reception antenna 70 via the mobile radio network 85 to the center 1. The location data signal can be used as Text or short message can be formed, which is transmitted for example in a GSM mobile radio network (Global System for Mobile Communications) as an SMS message (Short Message Service). A text number or short message can also be used to transmit a telephone number of the mobile terminal 5 to the control center 1 in order to enable the control center 1 to be called back to send the map data and / or route suggestions to the mobile terminal 5. In the control center 1, this location signal with the information about the position of the mobile terminal 5 is received by the second transmitting / receiving antenna 75 and passed on via the second receiving unit 40 to the second evaluation unit 50. The program then branches to a program point 105.

At program point 105, second evaluation unit 50 determines a section from a geographical map stored in memory 45, this section comprising the determined position of mobile terminal 5. The size of the selected section can be adapted to the size of the display device of the mobile terminal 5. To do this, however, the control center 1 must know the size of the display device of the mobile terminal 5.

Corresponding data on the size of the display device of the mobile terminal 5 can be transmitted in advance or with the first determined position from the mobile terminal 5 to the control center 1 be program point 100. The second evaluation unit 50 can cut out the map additionally select so that the determined position of the mobile device is 5 m in the center or m in the center of the selected map section. It can of course also be provided that the second evaluation unit 50 selects the map section such that the determined position of the mobile terminal is 5 m from an edge region of the selected map section. This can be useful for a navigation application if as much map material as possible in the direction of the planned movement of the mobile terminal 5 is to be displayed on the display device, but as little map material as possible in the area of the path already traveled by the mobile terminal 5.

In the selected map section, the second evaluation unit 50 also shows the determined position of the mobile terminal 5 at the corresponding point.

After program point 105, a branch is made to a program point 110. At program point 110 the second causes

Evaluation unit 50, the second transmission unit 55, for example, by means of a callback based on the received telephone number of the mobile terminal 5 for transmission of the selected map section with the faded-in position of the mobile terminal 5 by means of a suitable image signal from the second transmission / reception antenna 75 via the mobile radio network 85 to the mobile terminal 5 This image signal is then received by the first transmitting / receiving antenna 70 and fed to the first evaluation unit 35 via the first receiving unit 30. The program then branches to a program point 115.

At program point 115, the first evaluation unit 35 causes the received map section to be displayed with the displayed position of the mobile terminal 5 on the display device of the playback device 10.

For the transmission of the selected map section from the center 1 to the mobile terminal 5, the second evaluation unit 50 can cause the selected map section to be encoded by a compression method in order to save bandwidth and time in the transmission of the selected map section from the center 1 to the mobile terminal 5. The selected map section can be transmitted, for example, in accordance with the ITU-T standard (International Telecommunication Union) H.32x, one of the image compression methods H.261 and H.263 being used as the compression method. After program point 115, a branch is made to a program point 120.

At program point 120, the first evaluation unit 35 checks whether the user of the mobile terminal 5 has entered a navigation request on the input device 20. If this is the case, the program branches to a program point 125, otherwise the program branches to a program point 145.

At program point 125, the first evaluation unit 35 visually and / or acoustically prompts the user to enter a destination via the playback device 10. After entering the destination on the input device 20, the first evaluation unit 35 causes the first transmitting unit 25 to transmit this destination by means of a suitable one

Location data signal from the first transmission / reception antenna 70 via the mobile radio network 85 to the center 1. This location data information is then received via the second transmission / reception antenna 75 m at the center 1 and via the second reception unit 40 to the second evaluation unit 50 forwarded. The program then branches to a program point 130.

At program point 130, the second evaluation unit 50 calculates a suggested route between the determined position of the mobile terminal 5 and the predetermined destination. This route proposal can take current traffic data into account, such as traffic jams, blockages and changes in the traffic network or the like. The program then branches to a program point 135.

At program point 135, the second evaluation unit 50 causes the second transmission unit 55 to transmit the calculated route proposal by means of a corresponding navigation data signal from the second transmission

/ Receiving antenna 75 via the mobile radio network 85 to the mobile terminal 5. The navigation data signal can also be in the form of a text or short message and can be transmitted, for example, in a GSM mobile radio network as an SMS message. Also a transmission of the navigation data signal in

Speech form when the mobile terminal 5 calls the central station 1 is possible. This navigation data signal is received by the first transmitting / receiving antenna 70 and fed to the first evaluation unit 35 via the first transmitting unit 30. The program then branches to a program point 140.

At program point 140, the first evaluation unit 35 initiates an optical and / or acoustic reproduction of the route proposal calculated in the control center 1 on the

Playback device 10. An acoustic playback can take place, for example, by voice playback. This makes it easier to use the mobile terminal 5 in a vehicle. If the navigation data signal was transmitted as a text or short message, 5 by means of a m not shown in Figure 1

Speech synthesis module a speech output of this text or short message can be realized. Such a text or short message, which contains the suggested route, can, however, also be displayed on the display device. The program then branches to program point 145.

At program point 145, the first evaluation unit 35 checks whether a new position of the mobile terminal 5 is present within a predetermined time, either via the location receiver 15 or by user input on the input device 20, which differs from the previous position of the mobile terminal 5. If this is the case, the program branches to a program point 150, otherwise the program is exited.

At program point 150, the first evaluation unit 35 causes the first transmission unit 25 to transmit the new position of the mobile terminal 5 by means of a corresponding location data signal from the first transmission / reception antenna 70 via the mobile radio network 85 to the center 1. This location data signal with the new position of the mobile terminal 5 is received by the second transmitting / receiving antenna 75 and supplied to the second evaluation unit 50 via the second receiving unit 40. The program then branches to a program point 155.

At program point 155, the second evaluation unit 50 selects a new map section from the map material stored in the memory 45, which includes the new position of the mobile terminal 5, which new map section can in turn be adapted in a corresponding manner to the size of the display device of the mobile terminal 5 , The new map section can be selected by the second evaluation unit 50 such that the new position of the mobile terminal is 5 m in the middle or in the middle of the selected new map section. However, as described, it can also be provided that the new position of the mobile terminal 5 lies in an edge region of the selected new map section.

The second evaluation unit 50 then compares the previous map section selected before the new map section for the mobile terminal 5 with the selected new map section and generates image data as a function of differences between the two map sections. The program then branches to a program point 160.

At program point 160, the second evaluation unit 50 causes the second transmitter unit 55 to transmit the generated image data from the second transmit / receive antenna 75 via the mobile radio network 85 to the mobile terminal 5. The generated image data are then received by the first transmit / receive antenna 70 and via the first transmission unit 30 is forwarded to the first evaluation unit 35.

As already described, the image data can be transmitted from the control center 1 to the mobile terminal 5, encoded to the mobile terminal 5, by means of a compression process. The transmission of the image data from the control center 1 to the mobile terminal 5 can take place as described, for example in accordance with an image telephony standard, for example in accordance with the ITU-T standard H.32x, one of the compression methods being used

H.261 and H.263 image compaction methods can be used.

After program point 160, a branch is made to a program point 165. At program point 165 the first one updates Evaluation unit 35 shows the map section previously displayed on the display device of the playback device 10 as a function of the transmitted image data and displays the map section thus updated on the display device.

The program then branches to a program point 170. At program point 170, the first evaluation unit 35 checks whether a navigation application has been activated by the user of the mobile terminal 5 on the input device 20 or is still running. If this is the case, the program branches to a program point 175, otherwise the program branches back to program point 145. At program point 175, the first evaluation unit 35 checks whether a destination for the navigation application has already been entered on the input device 20 and transmitted to the control center 1. If this is the case, the program branches back to program point 130 and the route calculation is updated accordingly on the basis of the new position and the already known destination. Otherwise the program branches back to program point 125 and requests the entry of a corresponding destination as described.

In the event that the mobile terminal 5 reaches the predefined destination during a running navigation application, that is to say that the second evaluation unit 50 determines the identity between the position of the mobile terminal 5 and the destination, the navigation application is terminated after corresponding information about this termination transmitted from the control center 1 to the mobile terminal 5 and reproduced there on the playback device 10. For a pure navigation application without the transmission of map sections from the control center 1 to the mobile terminal 5, it can also be provided that the flow chart according to FIG. 2 only starts after program point 120 and without the Program items 150, 155, 160, 165 are run through, so that program item 145 branches directly to program item 170 if the decision is yes. This alternative embodiment is useful, for example, when the mobile terminal 5 is connected to a computer, for example a laptop, via a data interface, with navigation software with map material being stored in a memory of the computer. A route proposal transmitted to the mobile terminal 5 by the control center 1 can then be forwarded to the connected computer via the data interface. Using the navigation software, the computer then selects a map section from the map material that is assigned to the route proposal and displays the route proposal on a display device, for example a computer display, together with the selected suitable map section. In this way, the mobile terminal 5 also uses the computer's display device, which can thus also be viewed as an external part of the playback device 10.

For the update of the map section displayed on the display device of the playback device 10 when the position of the mobile terminal 5 changes, two different embodiments are given by way of example below.

According to FIG. 3, a flow chart for the flow according to a first of the two embodiments is shown. This sequence relates to program items 155, 160 and 165 according to FIG. 2, which are therefore shown in FIG. 2 as subroutines with double bars. According to the first embodiment, program point 155 is structured as follows: At a program point 200, the second evaluation unit 50 determines the new map section for the new position of the mobile terminal 5 from the map material stored in the memory 45, as described. The program then branches to a program point 205.

At program point 205, the second evaluation unit 50 disassembles the previous map section selected before the new map section for the mobile terminal 5 into individual image blocks. The program then branches to a program point 210.

At program point 210, the second evaluation unit 50 calculates a motion vector for each of the image blocks depending on the change in position of the mobile terminal 5 from the previous position to the new position. The program then branches to a program point 215.

At program point 215, the second evaluation unit 50 estimates the new map section based on the previous map section and the determined motion vectors. The program then branches to a program point 220.

At program point 220, the second evaluation unit 50 compares the estimated new map section with the new map section selected at program point 200 by forming a difference. This means that the second evaluation unit 50 of the new map section selected at program point 200 is the one at program point

215 subtracts an estimated new map section, creating a difference image. The program then branches to a program point 225. At program point 225, the second evaluation unit 50 generates corresponding image data, which comprise the difference image generated at program point 220, and causes the second transmission unit 55 to transmit the image data with the difference image by means of a corresponding image signal from the second transmission / reception antenna 75 via the mobile radio network 85 to the mobile Terminal 5. The image signal is received by the first transmitting / receiving antenna 70 and passed on to the first evaluation unit 35 via the first receiving unit 30. The program then branches to a program point 230.

At program point 230, the second evaluation unit 50 generates a data signal, which includes the motion vectors determined for the individual blocks of the previous map section, and causes the second transmission unit 55 to transmit this data signal from the second transmission / reception antenna 75 via the mobile radio network 85 to the mobile terminal 5. This data signal is then received by the first transmit / receive antenna 70 and via the first

Receiving unit 30 fed to the first evaluation unit 35. The program then branches to a program point 235. Program points 225 and 230 according to FIG. 3 form program point 160 according to FIG. 2.

At program point 235, the first evaluation unit 35 disassembles the previous map section with the same image blocks as the second evaluation unit 50 did at program point 205 and shifts the image blocks formed in each case by means of the associated and determined by the second evaluation unit 50 and transmitted to the mobile terminal 5 Motion vector. By shifting the image blocks formed by means of the motion vectors, e results in a shifted manner Map section. The program then branches to a program point 240.

At program point 240, the first evaluation unit 35 overlaps the shifted map section with the received one

Difference image The sum image formed in this way is then subsequently displayed at a program point 245, caused by the first evaluation unit 35, on the display device of the reproduction device 10 and corresponds to an error-free one

Determination and transmission of the difference image and the motion vectors from the control center 1 to the mobile terminal 5 essentially the new map section, which was determined by the second evaluation unit 50 at program point 200. Instead of the transmission of the complete new map section, however, only the transmission of the difference image and the motion vectors is required, so that bandwidth and time were saved in this transmission compared to the transmission of the complete new map section. The program is then exited. Program items 235, 240 and 245 according to FIG. 3 form program item 165 according to FIG. 2.

The method described in FIG. 3 is also based on the image compression methods H.261 and H.262 mentioned in accordance with the ITU-T standard H 32x.

In the case of a successive transmission of difference images and associated motion vectors, an error accumulation can occur due to transmission errors, which over time falsifies the map section to be displayed on the display device of the reproduction device 10 and may result in considerable deviations from the original map material. it can be provided at predetermined times, for example, at regular intervals, to carry out a transmission and display of the new map section as well as for the very first map section according to program items 100, 105, 110 and 115. Such a so-called "picture refresh" enables the display on the display device of the mobile terminal 5 adapted again and again to the original map material as it is stored in the memory 45.

Of course, every new one is at the

Display device of the mobile terminal 5 shown map section shows the position of the mobile terminal 5 on which this map section is based. This position is already faded in by the second evaluation unit 50 m, so that the difference image with this faded-in position is transmitted from the control center 1 to the mobile terminal 5.

A second embodiment for updating the map section to be displayed on the display device is shown using a flow chart according to FIG. The program point 155 according to FIG. 2 is broken down into a program point 300 and a program point 305. At program point 300, the second evaluation unit 50 determines the new map section from the map material stored in the memory 45 on the basis of the new position of the mobile terminal 5, as described. The program then branches to program point 305.

At program point 305, the second evaluation unit 50 determines, by comparing the new map section with the previous map section, those map areas that are only in the new map section and not in the previous one Map section are included. The program then branches to a program point 310.

At program point 310, the second evaluation unit 50 forms an image signal with image data, which comprise the map areas determined at program point 305, and causes the second transmission unit 55 to transmit this image signal from the second transmission / reception antenna 75 via the mobile radio network 85 to the mobile terminal 5. This image signal is received by the first transmitting / receiving antenna 70 and fed to the first evaluation unit 35 via the first receiving unit 30. The program then branches to a program point 315. The processes described at program point 310 according to FIG. 4 thus run under program point 160 according to FIG. 2.

At program point 315, the first evaluation unit 35 calculates an overall movement vector from the change in position of the mobile terminal 5 from the previous position to the new position. The program then branches to a program point 320.

At program point 320, the first evaluation unit 35 shifts the map section shown on the display device by the total movement vector determined at program point 315 and blinds the position of the mobile terminal 5 at the same point on the display device e as in the map section previously shown. By shifting the previous map section by the total motion vector, it can happen that individual

Map areas of the map section previously shown come to lie outside the display area of the display device and can therefore no longer be displayed. On the other hand, the displacement of the map section creates m displayable area elsewhere the display device empty areas where map data can no longer be displayed. By shifting the map section shown so far by the total motion vector, the displayed position of the mobile terminal 5 on the display device remains the same. After program point 320, a branch is made to program point 325.

At program point 325, the first evaluation unit 35 supplements the previous one, which has been shifted by the total motion vector

Map section around the transferred map areas at the locations where otherwise no map data would be displayed on the display device. This results in a display of the new map section selected at program point 300 on the display device of the mobile terminal 5, which is then displayed on the display device of the playback device 10 in the subsequent program point 330. Program points 315, 320, 325 and 330 according to FIG. 4 thus form program point 165 according to FIG. 2. The program is then exited.

The method described in FIG. 4 has several advantages over the method described in relation to FIG. 3:

1. There is no complex calculation of a

Difference image of the second evaluation unit 50, but only the determination of the additional map areas. 2. No motion vectors have to be transmitted from the control center 1 to the mobile terminal 5. Since the entire previous map section depends on the

Position change of the mobile terminal 5 is shifted evenly, the determination of the total motion vector is sufficient, so that no block-like disassembly of the previous map section and Determination of the associated motion vectors is required.

3. E "Image Refresh" is not necessary, since parts of the Oπgmal map material are transmitted from the control center 1 to the mobile terminal 5 anyway with the additional map areas.

Albeit the one after a common one

Image compression method for the motion picture transmission intended decomposition of the previous map section m

Image blocks and the assignment of a respective motion vector to the individual image blocks in the method according to FIG. 4 is not necessary due to the uniform displacement of the map section, but can still be used for the transmission according to the additional map areas determined according to the method according to FIG. 4 from the control center 1 to the mobile terminal 5 these additional map areas are encoded using a compression method, as is the case with moving image transmission, for example in accordance with the ITU-T standard H.32x, using an image compression method used there, such as, for example H.261 and H.263, is common.

For the transmission of the image data from the control center 1 to the mobile terminal 5, in all cases described, a video channel can be set up from the control center 1 to the mobile terminal 5 in accordance with the H.323 standard. However, the image data can also be coded from the control center 1 to the mobile terminal 5 using any compression method.

If there is sufficient transmission bandwidth for the transmission of image data from the control center 1 to the mobile terminal 5 via the mobile radio network 85, it can also be provided according to a third embodiment, each new one To transfer the map section completely from the control center 1 to the mobile terminal 5 and to display it there on the display device. For this purpose, the program points 100, 105, 110 and 115 according to FIG. 2 are then successively run through, with a desired navigation application after each newly determined position of the mobile terminal 5, a new route to the predetermined destination according to the program points 130, 135 and 140 can be carried out. If the user of the mobile terminal 5 specifies any position on the input device 20, he can request the associated map section from the control center 1 m in the manner described. A new position can then take place, for example, by using so-called direction or arrow keys on the input device 20, each of which specifies an overall movement vector of a certain length. In this way, the map section displayed on the display device of the mobile terminal 5 can be shifted by the user in any direction and supplemented by new map areas in accordance with any of the three described embodiments.

A prerequisite for displaying map material on the mobile terminal 5 is a sufficiently large display device. Information about the size of the display device of the mobile terminal 5 can be as described

Transmission of the first map section to the control center 1 or to the second evaluation unit 50. In general, before the first transmission of a map section, the mobile terminal 5 can transmit control information to the control center 1 or to the second evaluation unit 50, which contains information about the display capabilities and possibilities of the mobile terminal 5, which, in addition to the size of the display device, also includes the resolution and information about the color ability of the display device or the like. It can however, provision can also be made to supply the information about the capabilities of the display device of the mobile terminal 5 to the control center 1 from a central database in which corresponding information from a plurality of mobile terminals can be stored. The display device can be integrated into the mobile terminal 5, plugged onto it or connected externally to it via a cable connection or wirelessly.

In the second embodiment described in FIG. 4, the image data to be transmitted from the control center 1 to the mobile terminal 5 can optionally be compressed. Compression can take place using an image compression method used for moving image transmission, for example in accordance with the ITUT standard H.32x and one of the image compression methods H.261 and H.263 used in this standard. Due to the statics of the image data to be transmitted, which are based on geographic map material and thus contain still images, a more efficient compression of the image data to be transmitted can be used for this application than is necessary for the transmission of moving images. Here, e.g. a so-called run length coding or a compression method specially adapted to the statistics of the map data can be used.

The described methods according to the first and especially according to the second embodiment enable the previous mobile networks, for example according to the GSM standard (Global System for Mobile Communications) or according to the DCS 1800 standard (Digital Communication System) even at a data rate of only 9.6 kbit / s a position tracking of the mobile terminal 5 m each current map section as described. New Third generation mobile networks, for example according to the UMTS standard (Universal Mobile Telecommunication System) or the GPRS standard (General Paket Radio Service), will offer data rates of up to 2 Mbit / s in the future. This allows the real transmission of moving images and offers an optimal prerequisite and thus an improved quality of the navigation service, such as the representation of a virtual world. With data rates up to 2 Mbit / s, a complete transmission of the complete current map section from the central station 1 to the mobile terminal 5 according to the third embodiment is also possible without any problems.

The mobile terminal 5 can be any mobile telecommunications terminal.

Billing of the service used by the mobile terminal 5 for the transmission of map details and, if necessary. Route suggestions can be made via the telephone bill. One or more successive telecommunication connections can be used for the transmission of the location-related data information between the control center 1 and the mobile terminal 5, each of which is set up by dialing the corresponding call number of the control center 1 or the mobile terminal 5.

Claims

Expectations

1. Procedure for the transmission of location-based

Data information between a center (1) and a mobile terminal (5), in particular a mobile telecommunications terminal, characterized in that a position of the mobile terminal (5) is determined in a first step and transmitted to the center (1), that in a second Step in the control center (1) depending on the determined position of the mobile terminal (5), location-related data information for the mobile terminal (5) is formed, that a third step is the location-based

Data information is transmitted from the control center (1) to the mobile terminal (5) and that, in a fourth step, the received location-related data information is reproduced on a playback device (10) of the mobile terminal (5).

2. The method according to claim 1, characterized in that in the second step of the center (1) e section from a geographical map is selected, which includes the determined position of the mobile terminal (5), that in the third step the selected map section from the center (1) is transmitted to the mobile terminal (5) and that in the fourth step the transmitted map section with the determined position is reproduced on a reproduction device (10) of the mobile terminal (5).

3. The method according to claim 1 or 2, characterized in that in the second step m the center (1) em Route suggestion between the determined position of the mobile terminal (5) and a predetermined destination is calculated so that the route suggestion is transmitted from the control center (1) to the mobile terminal (5) in the third step and that the route suggestion is transmitted in the fourth

Step on the playback device (10) of the mobile terminal (5) is played back.

4. The method according to claim 3, characterized in that in the first step, the destination is specified on the mobile terminal (5) and transmitted to the center (1).

5. The method according to claim 3 or 4, characterized in that the selected map section by em compression method, in particular using one of the image compression methods H.261 and H.263 according to the ITU-T standard H.32x (International Telecommunication Union) encodes for Terminal (5) is transmitted.

6. The method according to any one of claims 2 to 5, characterized in that in the second step, the map section is selected so that the position of the mobile terminal (5) determined in the first step essentially m a central area of the selected

Map section lies.

7. The method according to any one of claims 2 to 6, characterized in that m a fifth step determines a new position of the mobile terminal (5) and to the

Center (1) is transmitted that m a sixth step m the center (1) em new map section is selected, which includes the new position of the mobile terminal (5) that m a seventh step image data depending on differences between the selected new map section and the previous map section are transmitted from the control center (1) to the mobile terminal (5) and that in an eighth step the previous map section is updated depending on the transmitted image data

Playback device (10) of the mobile terminal (5) is brought to playback.

8. The method according to claim 7, characterized in that in the sixth step the new map section is selected such that the new position of the mobile terminal (5) determined in the fifth step lies essentially in the middle of the selected new map section.

9. The method according to claim 7 or 8, characterized in that in the selection of the new map section in the sixth step, in particular using one of the image compression methods H.261 and H.263, the previous map section m individual picture blocks w rd that for each of the image blocks, depending on the change in position from the previous position to the new position of the mobile terminal (5), a motion vector is calculated that, based on the previous map section and the motion vectors, the new one

Map section is estimated that the estimated map section is compared with the new map section by forming the difference, so that a difference image is created, that the difference image is transmitted to the mobile terminal (5) with the image data in the seventh step, and that in the seventh step the motion vectors of the Control center (1) are transmitted to the mobile terminal (5) and that in the eighth step the map section to be reproduced on the playback device (10) from the previous map section is calculated by shifting the previous map section block by block using the motion vectors and superimposing the shifted map section formed in this way with the difference image

10. The method according to claim 9, characterized in that at predetermined times in the seventh step with the image data, the new map section is transmitted from the center (1) to the mobile terminal (5) and that in the eighth step the new map section with the new one

Position on the playback device (10) is reproduced

11. The method according to claim 7 or 8, characterized in that in the selection of the new map section in the sixth step map areas are determined which are only contained in the new map section and not in the previous map section, that in the seventh step with the image data the determined map areas of the center (1) is transmitted to the mobile terminal (5) and that in the eighth step the map section to be reproduced on the playback device (10) is calculated from the previously displayed map section by the previously displayed map section using a change in position from the previous position to new position of the mobile terminal (5) calculated total motion vector shifted and the shifted map section formed in this way is supplemented by the transferred map areas.

12. The method according to any one of claims 7 to 11, characterized in that the image data by a compression method, in particular using one of the image compression methods H.261 and H.263 according to the ITU-T standard H.32x, coded to be transmitted to the terminal (5).

13. The method according to any one of claims 2 to 12, characterized in that in the first step of the mobile

Terminal (5) is transmitted to the control center (1) about the size of the map section that can be reproduced on the playback device (10).

14. The method according to any one of claims 2 to 13, characterized in that the position of the mobile terminal (5) is determined by a location receiver (15), in particular a GPS receiver (Global Positionmg System).

15. The method according to any one of claims 2 to 14, characterized in that the position of the mobile terminal (5) on an emitting device (20) of the mobile terminal (5) is predetermined.

16. Mobile terminal (5), in particular mobile

Telecommunications terminal (5) for carrying out a method according to one of the preceding claims, characterized in that an evaluation unit (35) is provided which determines a position of the mobile terminal (5), that a transmission unit (25) is provided which ascertained the Position sends to a center (1) that a receiving unit (30) is provided, which receives location-related data information generated as a function of the determined position from the center (1), and that a reproduction device (10) is provided on which a reproduction of the location-related data information takes place.

17. Mobile terminal (5) according to claim 16, characterized in that the location-related data information is designed as a section of a geographical map and / or as a route proposal.

18. A mobile terminal (5) according to claim 16 or 17, characterized in that the transmitting unit (25) sends a new position determined by the evaluation unit (35) to the control center (1) and that the evaluation unit (35) has previously sent one to the Playback device (10) reproduced map section m depending on the image data received following the transmission of the new position updated by the control center (1).

19. Mobile terminal (5) according to claim 18, characterized in that the receiving unit (30) with the image data em difference image between a new map section and an estimated new map section from the center (1) receives that the receiving unit (30) also motion vectors of the

Control center (1) receives, the individual blocks of the previous map section are assigned, that the evaluation unit (35) calculates the map section to be reproduced on the playback device (10) from the previous map section by using the previous one

Map section moved block by block using the motion vectors and the shifted map section formed in this way is overlaid with the difference image.

20. Mobile terminal (5) according to claim 18, characterized in that the receiving unit (30) with the image data receives map areas from the center (1), that the evaluation unit (35) to be reproduced on the playback device (10) Map section calculated from the previously displayed map section by determining an overall movement vector from the change in position from the previous position to the new position of the mobile terminal (5), shifting the previously displayed map section by means of the calculated total movement vector and the shifted map section formed in this way by the transmitted ones Map areas added.

21. Mobile terminal (5) according to one of claims 16 to 20, characterized in that the transmitting unit (25) transmits information about the size of the map section reproducible on the playback device (10) to the control center (1).

22. Mobile terminal (5) according to one of claims 16 b s 21, characterized in that em location receiver (15), in particular em GPS receiver, is provided, which receives location data for determining the position.

23. Mobile terminal (5) according to one of claims 16 to 22, characterized in that an emitting device (20) is provided, on which the position of the mobile terminal (5) can be predetermined.

24. Control center (1) for carrying out a method according to one of claims 1 to 15, characterized in that a receiving unit (40) is provided which receives information about a position of a mobile terminal (5), in particular a mobile telecommunications terminal, that an evaluation unit (50) is provided, which forms location-dependent data information as a function of the position of the mobile terminal (5), and that a Transmitting unit (55) is provided, which transmits the location-related data information to the mobile terminal (5).

25. Control center (1) according to / claim 24, characterized in that e memory (45) is provided, the geographic map material is stored, that the evaluation unit (50) from the memory (45) selects a map section which shows the position of the mobile Terminal (5) and that the selected map section at least partially forms the location-related data information.

26. Control center (1) according to claim 24 or 25, characterized in that the evaluation unit (50) from the position of the mobile terminal (5) and one of the mobile

Terminal (5) received a predetermined destination calculated a route suggestion, and that the route suggestion at least partially forms the location-related data information.

27. The control center (1) according to claim 25 or 26, characterized in that the evaluation unit (50), upon receipt of a new position of the mobile terminal (5) by the receiving unit (40), selects a new map section which shows the new position of the mobile terminal

(5), and that the evaluation unit (50) transmits image data as a function of differences between the selected new map section and the previous map section via the transmitting unit (55) to the mobile terminal (5).

28. Control center (1) according to claim 27, characterized in that the evaluation unit (50) disassembles the previous map section m individual image blocks, that the evaluation unit (50) for each of the image blocks Depending on the change in position from the previous position to the new position of the mobile terminal (5), a motion vector is calculated that the evaluation unit (50) estimates the new map section based on the previous map section and the movement vectors, that the evaluation unit (50) estimates the map section with the new one Compares the map section by forming the difference, so that a difference image is created, that the transmission unit (55) transmits the difference image to the mobile terminal (5) with the image data and that the transmission unit (55) also transmits the motion vectors to the mobile terminal (5).

29. Control center (1) according to claim 27, characterized in that the evaluation unit (50) when selecting the new one

Map section Determines map areas that are only contained in the new map section and not in the previous map section, and that the transmitting unit (55) transmits the determined map areas to the mobile terminal (5) with the image data.

30. Control center (1) according to one of claims 25 to 29, characterized in that the receiving unit (40) receives information about the size of the map section that can be reproduced on the playback device (10) of the mobile terminal (5) and that the evaluation unit (50 ) selects the map section so that it can be completely reproduced on the playback device (10) of the mobile terminal (5).