JP2000295652A - Mobile communication equipment, mobile communication information providing system and information center of mobile communication information providing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To seek an appropriate communicable area corresponding to radio wave shielding objects by operating map data, the communicable area of a mobile telephone and preliminarily stored communication disabled areas in communicable area stored data based on the positional relation between the base station of the mobile telephone and the radio wave shielding object. SOLUTION: When the main processing part 1 of a navigation device prepares map data to be stored in a map data storing part 6, it uses a residential map, puts together information such as a place where radio waves are interrupted by a building located between the base station and the place, a place that is interrupted from the outside like a road in a tunnel or places that turn out to be communication disabled when actually traveling and stores them as communication disabled area data in a data storing part 12. Next, the part 1 generates data obtained by excluding the communication disabled area data from the data of a communication area data storing part 5, temporarily stores them in a memory 7 and shows them together with a map according to the map data of the part 6 on a display device 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication device mounted on a vehicle or used by being carried by a user, or a mobile device for providing various information from a data center to a mobile by communication. The present invention relates to a mobile communication information providing system, and more particularly, to an information center of a mobile communication information providing system.

[0002]

2. Description of the Related Art As a conventional navigation device, for example, as disclosed in Japanese Patent Laid-Open No. 10-89984,
Depending on the type of mobile phone, a navigation device that provides information on an area where communication such as telephones is possible in a vehicle may not be possible due to the presence of buildings in the area where communication is possible or geographical conditions. It is known that a possible location is stored in a memory, and the next display is performed by excluding the area from the communicable area.

As disclosed in Japanese Patent Application Laid-Open No. 9-326750, in a navigation device to which a mobile phone is connected, an incommunicable area is stored in road map data, and the arrival time and distance to the incommunicable area are determined. It is known that connection of a communication line and forcible connection release are performed accordingly.

Further, as shown in Japanese Patent Application Laid-Open No. 4-286430, a distribution map of radio field intensity is stored, and when an attempt is made to invade this stored area,
2. Description of the Related Art There is known a device that warns a user by voice or display.

[0005]

In a conventional navigation device, a communication-disabled area in a communication-enabled area can be set within a predetermined range, for example, within a radius of 50 m, around a communication-disabled area. Because they are excluded from the area, depending on the shape of the building, the location of the telephone relay station, etc., communication is possible even if communication is disabled, or vice versa.

[0006]

SUMMARY OF THE INVENTION A mobile communication device according to the present invention includes communication means connectable to a mobile telephone, current position detection means for detecting a current position, and communication of map data and the mobile telephone. A data storage means having communicable area storage data in which an area is stored in advance, and a communication failure calculating an uncommunicable area in the communicable area storage data based on a positional relationship between the base station of the mobile phone and the radio wave shield. And possible area calculation means.

[0007] A mobile communication device according to the present invention is a communication means connectable to a mobile telephone, a current position detection means for detecting a current position, a communication storing map data and a communicable area of the mobile telephone in advance. Data storage means having possible area storage data, and communication impossible area calculation means for calculating a communication impossible area in the communication possible area storage data based on the position and shape of the radio wave shield are provided.

[0008] A mobile communication device according to the present invention is a communication means connectable to a mobile telephone, a current position detection means for detecting a current position, a communication storing map data and a communicable area of the mobile telephone in advance. Data storage means having possible area storage data, and non-communicable area calculating means for calculating a non-communicable area in the communicable area storage data based on the positional relationship between the base station of the mobile phone and the radio wave shield The non-communicable area data calculated according to the above is additionally stored in the data storage means in advance.

A mobile communication device according to the present invention includes communication means connectable to a mobile telephone, current position detection means for detecting a current position, and communication data in which map data and a communicable area of the mobile telephone are stored in advance. Data storage means having possible area storage data, and communication impossible calculated by communication impossible area calculation means for calculating a communication impossible area in the communication possible area storage data based on the position and shape of the radio wave shield The regional data is additionally stored in the data storage means in advance.

[0010] An information providing system according to the present invention includes a mobile communication device having communication means connectable to a mobile phone and a current position detecting means for detecting a current position, a mobile phone communicable area and map data. Data storage means for storing, and a communication means capable of receiving the current position detected by the current position detection means from the mobile communication device via the mobile telephone line, and transmitting information to the mobile communication device, An information center is provided for terminating communication with the mobile communication device when the current position approaches a communicable area stored in the data storage means.

[0011] An information center of the information providing system according to the present invention includes a data storage means for storing a communicable area of a mobile telephone and map data, and a mobile communication device via a mobile telephone line from the mobile communication device. Communication means capable of receiving the current position of the mobile communication device and transmitting the information to the mobile communication device; and Computing means for terminating the communication.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, an embodiment of the present invention will be described. FIG. 1 shows Embodiment 1
FIG. 2 is a block diagram showing a functional configuration of the navigation device of FIG. In FIG. 1, reference numeral 1 denotes a CPU and the like.
A main processing unit that performs various calculations and processes, an audio control unit 2 that receives a signal from the main processing unit 1 and controls an audio output device 9 (described later), a display device 3 such as a liquid crystal display or a CRT, and 4 Remote control, keyboard, touch panel,
An input device such as a voice recognition device, and the input device 4 is capable of communication (including a call) when operated by a user;
It is possible to switch between display and non-display of the impossible area.

Reference numeral 5 denotes a communication area data storage section which is provided in a data storage section 12 (described later) and stores communication area data (data of a storage communication area). The display color is specified for the communicable area data for each mobile carrier (for each telephone company, each type, etc.) so that the mobile phone communicable area announced by the mobile phone carrier can be displayed on the display device 3. It is stored in the state. 6 is a data storage unit 12
(Described later), a map data storage unit that stores map data by link / node data or dot data, 7 is a memory that stores various data such as calculation results of the main processing unit 1, and 8 is a GPS receiver And obtains the current position by receiving radio waves from artificial satellites. A self-traveling position data detecting device using a vehicle speed sensor, a geomagnetic sensor, a gyro, or the like may be used together with or instead of the GPS receiver 8.

Reference numeral 9 denotes an audio output device such as a speaker, 10 denotes a communication unit which is a communication interface between the main processing unit 1 and a mobile phone 11 (described later), 11 denotes a removable phone such as a mobile phone or a PHS, or a car phone. A mobile phone 12 as a mobile phone such as a stationary phone, etc., and a data storage unit 12 for storing various data, such as a CD-ROM and a DVD
-A ROM, a semiconductor memory that can be stored and held, or a rewritable CD-R, DVD-R, magnetic disk, rewritable semiconductor memory, or the like is used. In the data storage unit 12, a communication area data storage unit 5 and a map data storage unit 6 are provided, respectively, and a storage area for storing and rewriting communication-disabled area data described later is also provided. ing. Further, a communication-disabled area as described later may be calculated in advance when the navigation map data is created and stored in the map data. In this case, there is no need to provide a communication-disabled area calculation means in the navigation device. Thus, a navigation device can be provided at low cost.

FIG. 2 is a diagram showing a method of estimating a place where communication by a mobile phone is not possible. In FIG. 2, map data (for example, a detailed city map) stored in the map data storage unit 6 or another map (for example, a house map) is set when a map for navigation is set in advance. It is used in a place where radio waves are blocked by the building 14 with the portable base station 13 and where there is no other base station nearby (for example, 15b in FIG. 2) or from outside such as a road in a tunnel 16. Information such as a blocked place (for example, 15a in FIG. 2) or a place where it was determined that the area was incapable of communication when the vehicle actually traveled is integrated into a communication incapable area 15, and the data storage area 12 stores the communication incapable area data. 17 is stored so that it can be distinguished from other data.

Using the communication-disabled area data generated in this way, in the vehicle-mounted navigation device, data (computation) obtained by excluding the communication-disabled area data 17 from the communication-enabled area data 5 stored in the data storage unit 12 is calculated. The main processing unit 1 generates the data of the communicable area, temporarily stores the generated data in the memory 7, and displays it on the display device 3 together with the map based on the map data stored in the map data storage unit 12, thereby enabling the user The area where the mobile phone can communicate and the area where it cannot communicate can be clearly displayed or notified by voice. Also,
A part or all of the communicable area data 5 stored in the data storage unit 12 may be replaced or overwritten with newly obtained communicable area data.

FIG. 3 is a diagram showing a display example when the display device 3 indicates a communicable / impossible area. As shown in this figure, when a map is displayed on the display device 3, a communicable area and a non-communicable area are set on the map (the originally communicable area is set to the non-communicable area by the above-described calculation. Area) and that the area is originally outside the communicable area. Here, the communicable area is colored so that it can be visually recognized. Further, in order to prevent the road map from becoming invisible as a result of the coloring, the color may be colored with a light color at least so that the road can be seen, or the background color may be colored.

Further, the current location 16 determined by the GPS receiver 8 is used.
Has approached the communication-disabled area 15 (for example, within 50 m in a straight line distance or link distance (distance on a road))
Is less than 50 m, and the remaining time is calculated from the link distance and the vehicle speed. ), When the main processing unit 1 detects the
, It is possible to output from the audio output device 9 a message notifying that communication is not possible, such as "I will soon be unable to talk."

FIG. 4 is a diagram showing the color coding of the communicable area data for each carrier, and the colors of ○ 15 in FIG. 4 are respectively determined as shown in FIG. 4, for example. Here, an example in which the colors are classified according to the types of the colors is shown, but the colors may be classified by changing the shading and the brightness of the colors. Further, as described above, a boundary line between the communicable area and the uncommunicable area may be displayed instead of being color-coded. At this time, it is desirable to add a symbol or the like to the boundary so that it is possible to know which side of the boundary is a communicable area and which side is a non-communicable area.
For example, a short slash may be added to the communicable side of the boundary.

FIG. 5 is a diagram showing an example in which a map which is color-coded according to the type of mobile phone is displayed on the display device. In this figure, P is a current position mark indicating the current position of the own vehicle. On a map represented by a diagram, communicable areas are shown in different colors. If the areas 18, 19 and 20 have different patterns, respectively. Is displayed. The area 18 is an area where the company A can communicate with the mobile phone of the carrier, and is displayed here in a vertical line pattern. The area 19 is an area where the company A and the company B can communicate with the mobile phone of the carrier, and is indicated by a diagonal pattern here. The area 20 is an area where the company B can communicate with the mobile phone of the carrier, and is displayed here in a mesh pattern. Here, the vehicle traveling at the current position P is only a short time (for example, 50 m or less) from the area 19 to the area 20.
Therefore, if the carrier of the mobile phone used in the own vehicle is that of the company A, a warning to the effect that the mobile phone cannot be communicated is notified. Alternatively, if the mobile phone of the own vehicle is of a carrier switching type, the carrier can be switched from B company to A company at the boundary line.

FIG. 6 is a diagram showing a display example in which this device communicates with a plurality of vehicles by a wireless device or a portable telephone to receive the position of each vehicle and display the position of the vehicle together with the position of the own vehicle. In FIG. 6, since the other vehicle T1 is traveling in the area 20, communication is possible with the mobile phone of the company B, and since the other vehicle T2 is traveling in the area 19, A
Can communicate with both companies' mobile phones, and the other vehicle T
3 is located in the area 18, but since the vehicle is traveling in the area where communication is not possible, it can be seen that a call using a mobile phone is impossible.
It is also possible to display a similar screen on a display map used by a base station of a business navigation system managed and operated by the base station to confirm which vehicle can communicate with which mobile phone. . Also, in FIGS. 5 and 6, the boundaries of the communicable / impossible areas are approximated to straight lines for simplification of the data, but they may be constituted by curves as actual boundaries.

Further, since the current position is not transmitted from the vehicle traveling in the area where the mobile phone cannot communicate with the mobile phone, it cannot be confirmed that the vehicle is actually traveling in the area where communication is impossible. For example, the other vehicle T2 can currently make a call using a mobile phone, but after traveling for a while,
It can be predicted that the vehicle will enter an area where communication is not possible (this prediction may be made on the assumption that the vehicle travels along a road, or if the vehicle T2 is traveling along a recommended route searched for a route). , It may be assumed that the vehicle will travel along the recommended route). Therefore, if the communication is interrupted as predicted, it is possible to confirm with the base station or the own vehicle that the vehicle has entered an area where communication is not possible, not a failure of the equipment in the other vehicle T2. It is also possible to predict how many minutes it will take to return to a possible area.

By the way, the map data 6 is stored in such a manner that it is possible to discriminate a place where it is supposed that communication is impossible due to the existence of a tunnel or a building and geographical conditions and communication is not possible by a mobile phone. It is considered that there is actually a place where communication is possible (such as a gap in a building) within the possible area. Therefore, when the communication unit determines that communication is possible while traveling in such an area where communication is not possible, the location where communication is possible is stored in the memory 7.
To be displayed as a communicable area in the next display. Further, in the first embodiment, the case where the incommunicable area is calculated in the device mounted on the vehicle is shown. However, when map data for a mobile communication device such as a navigation device is created in advance, a radio wave shielding object is used. May be calculated, and the stored map data may be created.

Embodiment 2 FIG. In the above-described first embodiment, the non-communicable area estimated and set in the communicable area is configured by an ellipse that is evenly extended from the center point. The shape of the uncommunicable area is formed in consideration of the positional relationship between the telephone base station and objects to be shielded from radio waves such as buildings and mountains. FIG.
FIG. 8 is an explanatory diagram for explaining setting of a communication impossible area in the second embodiment. In this figure, A is a mobile phone base station that communicates with a mobile phone, and the area that can communicate with the mobile phone base station A is A1. B is a mobile phone base station that communicates with a mobile phone of the same carrier as the mobile phone base station A, and the range that can communicate with the mobile phone base station B is B1. C is a building that causes radio wave shielding, and an area where communication is not possible due to this building C is assumed to be C1. D is a building that causes radio wave shielding, and an area where communication with the mobile phone base station B is not possible due to this building D is denoted by D.
1, the area where the building D cannot communicate with the mobile phone base station A is D2, and the area where the building D cannot communicate with the mobile phone base stations A and B is D3.

Here, the communication impossible area C1 is not set evenly around the building C in consideration of the positional relationship between the mobile phone base station A and the building C, but is set at the mobile phone base station of the building C. The opposite side of A is set to be wider. As a result, it is possible to set an area where communication is impossible in an actual radio wave shielding state.

The area D3 where communication is not possible due to the building D
Is a portion where the communication impossible area D2 for the mobile phone base station A and the communication disabled area D1 for the mobile phone base station B overlap, that is, the mobile phone base station A and the mobile phone base station B An area where communication is not possible with the telephone base station is set as an area where communication is not possible. FIG.
Inside, the shaded area is set as a call unavailable area. Further, if the data of the building heights of the buildings C and D are stored, this height data can be considered, and the building C
If the building D is higher than the building C, the area where the communication is impossible and the length of the area D1 and D2 where the communication is not possible by the building D are set larger than the area C1 where the communication is impossible by the building C, thereby setting the communication impossible area more appropriately. It is possible to do.

Incidentally, E in FIG. 7 indicates a point where it was confirmed that communication was impossible when the vehicle actually ran, and E1
Indicates a call-disabled area set by this point E. In the case of this point E, unlike the above-mentioned building, since the cause of the call failure is not specified, the call unavailable area should not have directionality due to the positional relationship with the mobile phone base station. A circular non-communicable area E1 is set with a certain distance from the point E as a range.

Further, when the present invention is used in an information providing system for obtaining various information from an information providing center via a mobile phone, it is possible that a call can be disconnected in advance, that is, a vehicle is likely to enter an area where communication is impossible. , Display, sound, etc., and the process of automatically disconnecting the mobile phone automatically can be performed, preventing problems caused by sudden disconnection during data transmission / reception. Is possible.

Embodiment 3 FIG. 8 is a block diagram schematically showing the third embodiment. In FIG. 8, reference numeral 20 denotes a vehicle that receives an information providing service. The vehicle 20 is equipped with the on-vehicle navigation device as described in the first and second embodiments and is connected to a mobile phone. . An information center 21 provides traffic congestion information, facility information, information on various events, and the like to the vehicle 20 via a telephone line. The information center 21 includes a data storage unit 22, a communication unit 23, and a calculation unit 24. Is provided. The data storage unit 22 stores map data, communicable area data, uncommunicable area data, and the like, similarly to the data storage units described in the above embodiments.

The communication unit 23 communicates with the vehicle 20. The communication unit 23 receives position data, information provision request data, user authentication data at the time of information provision, and the like from the vehicle through a telephone line, and transmits the data to the vehicle. Then, the requested information is transmitted. The arithmetic unit 24 compares the position data of the vehicle 20 received by the communication unit 23 with the map data and the communicable / impossible area data stored in the data storage unit 22, so that the area where the vehicle 20 cannot communicate is obtained. It is checked whether or not to enter the area. If there is a possibility of entering an area where communication is impossible by the time the information is transmitted to the vehicle 20, the communication is temporarily terminated. As a result, it is possible to prevent sudden interruption of communication and retransmission of information transmitted up to that point from the beginning.

In each of the above-described embodiments, a location in which communication is not possible with a mobile phone due to the existence of a tunnel or a building or geographical conditions is distinguished from map data in advance so that communication is impossible. By excluding from the area where communication is possible for the first time, it is possible to determine the area where communication is not possible within the area where communication is possible. If there is, it can be stored. The communicable areas are displayed in different colors depending on the type of mobile phone.

In each of the above-mentioned embodiments, the communication-disabled area calculating means is characterized in that the communication-disabled area is calculated based on the shape of the radio wave shield. In this case, it is possible to obtain a more appropriate communication impossible area.

The non-communicable area calculation means may calculate the non-communicable area based on the height of the radio wave shield, and the area shielded by the radio wave shield may be determined according to the height of the radio wave shield. It can be made larger or smaller, and a more suitable area where communication is impossible can be found.

Further, a display means for displaying the communicable area calculated by the calculation means together with the map is provided, so that the user can visually confirm the area.

Further, the display means is characterized in that a communicable area can be simultaneously displayed for each type of mobile telephone, whereby the range in which the mobile telephone used by the user can use the mobile telephone can be displayed. If it is possible to know the location of the other person, it is possible to confirm which mobile phone the other person can use to make a call.

Further, when it is detected that the vehicle is approaching the outside of the communicable area calculated by the calculating means, the user is informed of the fact by the notifying means. Inadvertent disconnection of the telephone can be prevented, and the telephone call can be formalized in advance, and in the case of data communication, stopped and stored at an appropriate place, so that communication can be efficiently restarted.

In addition, communication is attempted in the communication impossible area calculated by the communication impossible area calculating means, and if communication is possible, communication in a predetermined area including the communication enabled point is possible. It is also characterized by storing as an area, and it is possible to appropriately store and use the area where radio wave shielding has been demolished or communication has been established due to the establishment of a mobile phone base station that is not in the data You can do it.

Further, the communication means receives position data of another mobile communication device by communicating with another mobile communication device, and the display means displays a map based on the position data of the other mobile communication device. It is also characterized by displaying a symbol indicating the position of another mobile communication device on the top, so that the user can call or try to call another person,
When receiving or trying to receive a call from another person, it is possible to determine on the map whether communication is likely to be impossible or whether communication is possible.

When the current position approaches a predetermined range from the outside of the communicable area stored in the data storage means, the arithmetic means for terminating communication with the mobile communication device determines whether or not the remaining amount of information to be transmitted is present. Is also characterized by changing the predetermined range according to this, by this, when the remaining amount of information to be transmitted is large, the communication is terminated early, and when the remaining amount of information is small, Communication can be performed efficiently while terminating the communication late to avoid inadvertent disconnection of the communication.

[0040]

The mobile communication device according to the present invention has communication means connectable to a mobile telephone, current position detection means for detecting a current position, map data and a communicable area of the mobile telephone. Data storage means having the communicable area storage data, and non-communicable area calculating means for calculating the non-communicable area in the communicable area storage data based on the positional relationship between the base station of the mobile phone and the radio wave shield Therefore, an appropriate communicable area corresponding to the radio wave shield can be obtained.

A mobile communication device according to the present invention includes a communication means connectable to a mobile telephone, a current position detection means for detecting a current position, a communication storing map data and a communicable area of the mobile telephone in advance. Since data storage means having possible area storage data and communication impossible area calculation means for calculating a communication impossible area in the communication possible area storage data based on the position and shape of the radio wave shield are provided, By calculating the communication impossible area according to the position and the shape of the radio wave shield, an appropriate communication possible area can be obtained.

The mobile communication device according to the present invention is a non-communicable area calculating means for calculating a non-communicable area in the communicable area storage data based on the positional relationship between the base station of the mobile telephone and the radio wave shield. Since the non-communicable area data calculated by the above is additionally stored in the data storage means in advance, it is necessary to use the non-communicable area corresponding to the positional relationship between the base station of the mobile phone and the radio wave shield. Can be.

According to the mobile communication device of the present invention, the communication disabled area calculated by the communication disabled area calculating means for calculating the communication disabled area in the communication enabled area storage data based on the position and shape of the radio wave shield. Since the regional data is additionally stored in the data storage means in advance, the position of the radio wave shield,
It is possible to use an area where communication is impossible according to the shape.

In the information providing system according to the present invention, the information center for terminating the communication with the mobile communication device when the current position of the mobile communication device approaches the communicable area stored in the data storage means. Before the communication became impossible, the information center terminated the communication properly before the communication became impossible. Can be prevented.

The information center of the information providing system according to the present invention communicates with the mobile communication device when the current position of the mobile communication device approaches a predetermined range from outside the communicable area stored in the data storage means. The communication center is appropriately terminated before the communication becomes impossible because of the provision of the arithmetic means for terminating the communication. In addition, problems such as communication errors can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a navigation device according to Embodiment 1 of the present invention.

FIG. 2 is a diagram illustrating a method of estimating a place where communication by a mobile phone is not possible.

FIG. 3 is a diagram illustrating a display example of a display device of the navigation device.

FIG. 4 is a diagram illustrating a method of color-coding communicable area data.

FIG. 5 is a diagram illustrating a display example in which color-coded display is performed for each type of mobile phone.

FIG. 6 is a diagram showing a display example of displaying a plurality of vehicle positions.

FIG. 7 is an explanatory diagram illustrating setting of a communication impossible area according to the second embodiment of the present invention.

FIG. 8 is a block diagram schematically showing a third embodiment of the present invention.

[Explanation of symbols]

1. 1. main processing unit; 2. voice control unit; Display device,
4. Input device; 5. Talkable area data storage unit, 6. map data storage, Memory, 8. GPS receiver, 1
0. Communication unit; Mobile phone, 12. Data storage unit, 1
3. 13. mobile phone base station; Building, 15. Area where communication is not possible, 16. Tunnel, 17. Communication available area, 21. Information Center

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04Q 7/38 H04B 7/26 109T F-term (Reference) 2C032 HB05 HB11 HB25 HC22 HD04 2F029 AA02 AA07 AB01 AB07 AB09 AC02 AC04 AC09 AC13 AC14 AC18 5H180 AA01 AA21 AA30 BB05 BB13 FF04 FF05 FF13 FF22 FF25 FF27 FF33 5K067 AA01 AA21 BB03 BB21 DD52 EE02 EE10 FF03 FF23 FF31 GG21 HH11 JJ52 KK15 KK15 KK15 9001 DD001

Claims (6)

[Claims] 1. A communication means connectable to a mobile telephone, a current position detection means for detecting a current position, and a data storage having map data and communicable area storage data preliminarily storing a communicable area of the mobile phone. Means, and a non-communicable area calculating means for calculating a non-communicable area in the communicable area storage data based on the positional relationship between the base station of the mobile phone and the radio wave shield. Mobile communication device. 2. A communication means connectable to a mobile telephone, a current position detection means for detecting a current position, and a data storage having map data and communicable area storage data preliminarily storing a communicable area of the mobile phone. A mobile communication device, comprising: means for calculating a communication disabled area in the communication enabled area storage data based on the position and shape of the radio wave shield. 3. A communication means connectable to a mobile telephone, a current position detection means for detecting a current position, and a data storage having map data and communicable area storage data preliminarily storing a communicable area of the mobile telephone. Means for calculating a communication impossible area in the communication area storage data based on a positional relationship between the base station of the mobile telephone and the radio wave shield. A mobile communication device, wherein regional data is additionally stored in the data storage means in advance. 4. A communication means connectable to a mobile telephone, a current position detection means for detecting a current position, and a data storage having map data and communicable area storage data preliminarily storing a communicable area of the mobile phone. Means for calculating a non-communicable area in the communicable area storage data based on the position and shape of the radio wave shield. A mobile communication device, which is additionally stored in advance in a mobile communication device. 5. A mobile communication device having communication means connectable to a mobile phone and current position detection means for detecting a current position, data storage means for storing a communicable area of the mobile phone and map data, And, receiving a current position detected by the current position detection means from the mobile communication device via a mobile telephone line, and having communication means capable of transmitting information to the mobile communication device,
An information providing system comprising an information center for terminating communication with the mobile communication device when the current position approaches an outside of a communicable area stored in the data storage means. 6. A data storage means for storing a communicable area of a mobile telephone and map data, and a current position of the mobile communication device is received from the mobile communication device via a mobile telephone line. Communication means capable of transmitting information to the communication device, and arithmetic means for terminating communication with the mobile communication device when the current position approaches a predetermined range from outside the communicable area stored in the data storage means An information center for an information providing system, comprising: