JP3518284B2 - Mobile communication system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system for performing data communication between a mobile station mounted on a mobile unit and a base station via a wireless line.

[0002]

2. Description of the Related Art Conventionally, in a mobile communication system for carrying out data communication between a mobile station mounted on a vehicle and a base station via a wireless line, the communication quality in a wireless section depends on the movement of the mobile station. Fluctuate significantly. Therefore, even if the communication quality is deteriorated at the start of communication, it may be improved during communication, or conversely, even if the communication quality is good at the start of communication, it may be extremely deteriorated during communication.

In order to prevent a communication error caused by deterioration of communication quality in a wireless section, the transmission rate of information is corrected downward within a range that can be used by an application used in a data terminal, and an error correction code or the like is used. It is conceivable to use an error correction control system that adds a redundant signal. However, while the communication quality is improving, there is a problem that excessive error correction control deteriorates the transmission efficiency and unnecessarily increases the communication time.

Further, particularly in data communication, when a communication failure occurs in a tunnel, a mountain, or a shadow of a building, the call is interrupted without the termination control being completed. Therefore, a reprocedure is required to restart the communication. is necessary. As a result, the talk time is prolonged,
There is a problem that the transmission efficiency becomes poor.

To address this problem, Japanese Patent Laid-Open No. 7-123
In the "communication system" described in Japanese Patent No. 043, a method is disclosed in which fluctuations in channel quality are detected on the mobile station side and an appropriate communication method (error correction method) is selected to cope with the fluctuation.

As shown in FIG. 14, this mobile station side communication device has a radio device 101 which outputs received electric field strength data and phase error data, a channel quality estimation means 103, a transmission control means 105 and an error control processing means 107. During communication, the line quality estimation means 103 monitors the received electric field strength from the wireless device 101 and the phase error during communication,
The line quality data is output to the transmission control means 105. The transmission control means 105 determines the switching of the error correction control function using this line quality data, and the error control processing means
The determined switching process is performed.

This determination algorithm suppresses the redundancy of error control to improve the transmission efficiency when the communication quality is good, and increases the redundancy of error control when the communication quality deteriorates. Works like.

[0008]

However, since the conventional communication system is based on the received electric field strength and the phase error data at the communication start position, it has a problem that it cannot cope with an unexpected communication failure after the start of communication. It was

The present invention has been made in view of the above,
It is an object of the present invention to provide a mobile communication system capable of preventing a communication error caused by the deterioration of the line quality in the wireless section.

[0010]

The invention according to claim 1 is
In order to solve the above-mentioned problem, a mobile communication system for performing information communication between a mobile station mounted on a mobile body and a base station via a wireless line, wherein the base station side is adapted to correspond to map information. Communication status storage means for storing communication status information indicating the line quality level, and communication status reading means for reading the communication status information at the predicted position when the predicted position information is received from the mobile station, and the communication status information. The communication system selecting means for selecting any one of a plurality of communication methods based on the above, and the communication method transmitting means for transmitting the communication method information indicating the selected communication method to the mobile station side, The mobile station side includes a predicted position calculation means for calculating predicted position information of the mobile unit, a predicted position transmission means for transmitting the calculated predicted position information to the base station side when a communication request is made, and a base station. Communication method from station A communication system receiving means for receiving the broadcast,
The gist of the present invention is to have a communication control means for performing communication control based on the received communication method information when the mobile body reaches the predicted position.

In order to solve the above-mentioned problems, a second aspect of the present invention is a mobile communication system for performing information communication between a mobile station mounted on a mobile body and a base station via a wireless line, The base station side stores communication status storage means for storing communication status information indicating the line quality level in association with map information, and communication status information on the travel path when the travel path information is received from the mobile station side. To the mobile station side, a communication status reading means for reading out, a communication method selecting means for selecting one of a plurality of communication methods based on the communication status information, and communication method information indicating the selected communication method. The mobile station side includes a communication system transmitting means for transmitting, and the mobile station side calculates the travel route information of the moving body and the calculated travel route information when the communication request is made by the base station. To send to the side Transmitting means, communication method receiving means for receiving communication method information from the base station side, and communication control means for performing communication control based on the received communication method information when the mobile body is traveling on the traveling route. It is a gist to have.

[0012] In order to solve the above-mentioned problems, the invention according to claim 3 is arranged such that the communication system selection means selects either a deemed voice communication system for converting a data string relating to data communication into a voice signal or a data communication system. The point is to select.

In order to solve the above-mentioned problems, a fourth aspect of the present invention is a mobile communication system for performing information communication between a mobile station mounted on a mobile body and a base station via a wireless line, The base station side receives communication status storage means for storing communication status information indicating the line quality level corresponding to map information, traffic information storage means for storing traffic information, and travel route information from the mobile station side. In this case, communication status reading means for reading the communication status information on the travel route, section search means for searching the travel route section whose line quality level is equal to or higher than a predetermined value, and the traffic route information of this travel route section based on the traffic information. A travel time calculating means for calculating the travel time, and a travel time transmitting means for transmitting the travel time information to the mobile station side,
The mobile station side is a traveling route calculating means for calculating traveling route information from the current position to the predicted position, and a traveling route transmitting means for transmitting the traveling route information to the base station side when a communication request is made. And a traveling time receiving means for receiving traveling time information from the base station side, and communication for controlling to perform information communication within the traveling route section when the required communication time for information communication is shorter than the traveling time. The gist is to have a control means.

In order to solve the above problems, a fifth aspect of the present invention is a mobile communication system for performing information communication between a mobile station mounted on a mobile body and a base station via a wireless line, Based on a download request signal from the mobile station side, the base station side stores communication state storage means for storing communication state information indicating a line quality level in association with map information, traffic information storage means for storing traffic information, and a download request signal from the mobile station side. The communication status information or traffic information on the travel route is read out, and communication status transmission means for transmitting this communication status information or traffic information to the mobile station side is provided. A travel route calculating means for calculating the travel route information; a download request signal transmitting means for transmitting a download request signal for communication status information or traffic information on the travel route to the base station side; Communication status receiving means for receiving communication status information or traffic information from the side, section searching means for searching a travel route section whose line quality level is a predetermined value or more based on the received communication status information, and received traffic information Based on the above, the travel time calculating means for calculating the travel time of the travel route section and the control for performing the information communication within the travel route section when the communication required time for information communication is shorter than the travel time. It is a gist to have a communication control means for performing.

In order to solve the above problems, a sixth aspect of the present invention is a mobile communication system for performing information communication between a mobile station mounted on a mobile body and a base station via a wireless line, The base station side stores communication status storage means for storing the communication status information indicating the line quality level for each line carrier in association with the map information, and, when receiving the travel route information from the mobile station side, the line concerned. The communication status information on the travel route of the business operator is read, and based on the communication status information, the communication method selecting means for selecting any one of a plurality of communication methods and the selected communication method information are moved. The mobile station side has a communication method information transmitting means for transmitting to the station side, and the mobile station side uses a traveling route calculating means for calculating traveling route information of the mobile body and a line carrier to be used when a communication request is made. With the operator recognition signal indicating The traveling route transmitting means for transmitting the calculated traveling route information to the base station side, the communication system receiving means for receiving the communication system information from the base station side, and the mobile body when the traveling body is traveling on the traveling route. The gist is to have a communication control unit that controls communication based on communication method information.

In order to solve the above-mentioned problems, a seventh aspect of the present invention is a mobile communication system for performing information communication between a mobile station mounted on a mobile body and a base station via a wireless line, The base station side has communication status storage means for storing communication status information indicating a line quality level for each line carrier in association with map information, traffic information storage means for storing traffic information, and traveling from the mobile station side. If you receive the route information,
A communication status reading means for reading the communication status information on the travel route of the line carrier, a section searching means for searching a travel route section whose line quality level is a predetermined value or more, and the travel route section based on the traffic information. And a traveling route calculating unit that calculates traveling time of the traveling time and transmits traveling time information to the mobile station side, and the mobile station side calculates traveling route information from the current position to the predicted position. When a communication request is made, a travel route transmission means for transmitting the calculated travel route information to the base station side together with a carrier recognition signal indicating the line carrier to be used, and the travel time information from the base station side. It is necessary to have a traveling time receiving means for receiving the information and a communication control means for controlling the information communication within the traveling route section when the required communication time for the information communication is shorter than the traveling time. To.

In order to solve the above problems, the present invention is a mobile communication system for performing information communication between a mobile station mounted on a mobile body and a base station via a wireless line, The base station side includes a communication status storage unit that stores communication status information indicating a line quality level for each line carrier in association with map information, a traffic information storage unit that stores traffic information, and a mobile station side Communication status transmitting means for reading communication status information or traffic information on the travel route from the communication status information of the line carrier based on the download request signal and transmitting the communication status information or traffic information to the mobile station side. The mobile station side, travel route calculation means for calculating the travel route information from the current position to the predicted position,
Download request signal transmission means for transmitting to the base station side a download request signal for communication status information or traffic information on the calculated travel route together with a carrier recognition signal indicating the line operator to be used, and communication status from the base station side Communication status receiving means for receiving information or traffic information, based on the received communication status information, section search means for searching a travel route section whose line quality level is a predetermined value or more, and based on the received traffic information, A travel time calculating means for calculating the travel time of the travel route section and a communication control means for controlling the information communication within the travel path section when the required communication time for information communication is shorter than the travel time. The point is to have and.

[0018]

According to the present invention as set forth in claim 1, the predicted position of the mobile unit is calculated by the predicted position calculation means on the mobile station side, and when the communication request is made, the predicted position information is stored in the base station. Send to. When the base station side receives the predicted position information, the base station reads out the communication status information indicating the line quality level at the predicted position stored in the communication status storage means, and based on the communication status information, a plurality of communication methods are used. Any one of the above is selected, and communication method information representing the selected communication method is transmitted to the mobile station side. When the mobile unit arrives at the predicted position, the communication control means on the mobile station side performs communication control according to the line quality at the predicted position based on the received communication method information, and thereby the line quality in the wireless section. It is possible to prevent a communication error caused by the deterioration of the.

According to the second aspect of the present invention, the traveling route calculation means on the mobile station side calculates the traveling route of the mobile body, and when the communication request is made, the traveling route information is transmitted to the base station. To do. When the base station side receives the travel route information, the base station side reads the communication condition information indicating the line quality level on the travel route stored in the communication condition storage means, and based on the communication condition information, a plurality of communication methods Any one of the above is selected, and communication method information representing the selected communication method is transmitted to the mobile station side. When the moving body is traveling on the travel route, the communication control means on the side of the mobile station performs communication control according to the line quality on the travel route based on the received communication method information, and It is possible to prevent a communication error caused by the deterioration of the line quality.

According to the third aspect of the present invention, the communication system selecting means selects either the deemed voice communication system for converting a data string relating to data communication into a voice signal or the data communication system. It is possible to prevent a communication error that occurs due to the deterioration of the line quality in the wireless section.

According to the present invention of claim 4, the traveling route calculation means on the mobile station side calculates the traveling route of the mobile body, and when the communication request is made, the traveling route information is transmitted to the base station. To do. When the base station side receives the travel route information, the base station side reads the communication condition information indicating the line quality level on the travel route stored in the communication condition storage means, and the travel route whose line quality level is equal to or higher than a predetermined value. The travel time of the section is calculated, and the calculated travel time information is transmitted to the mobile station side. When the communication time required for information communication is shorter than the travel time, the communication control means on the mobile station side controls the information communication within the travel route section with good line quality, thereby enabling the wireless section. It is possible to prevent a communication error that occurs due to the deterioration of the line quality.

According to the present invention of claim 5, the traveling route calculation means on the side of the mobile station calculates the traveling route of the moving body, and a download request signal for communication status information or traffic information on the traveling route is sent to the base station. Send. When the base station side receives the download request signal, the base station reads out the communication status information indicating the line quality level on the travel route stored in the communication status storage means or the traffic information stored in the traffic information storage means. , To the mobile station side. The mobile station side calculates, based on the communication status information or the traffic information received from the base station, the travel route section in which the line quality level is a predetermined value or more and the travel time of the travel route section, and the communication control means determines the information. If the communication time required for communication is shorter than the travel time, it is caused by deterioration of the line quality in the wireless section by controlling the information communication within the travel route section with good line quality. It is possible to prevent a communication error that occurs.

According to the sixth aspect of the present invention, the traveling route calculation means on the mobile station side calculates the traveling route of the mobile body, and when a communication request is made, the traveling route information together with the operator recognition signal. To the base station. When the base station side receives the travel route information, it reads out the communication status information indicating the line quality level on the travel route from the communication status information of the communication carrier stored in the communication status storage means. Based on the communication status information, any one of the plurality of communication methods is selected, and the communication method information representing the selected communication method is transmitted to the mobile station side. When the moving body is traveling on the travel route, the communication control means on the side of the mobile station performs communication control according to the line quality on the travel route based on the received communication method information, and It is possible to prevent a communication error caused by the deterioration of the line quality.

According to the present invention of claim 7, the traveling route calculation means on the side of the mobile station calculates the traveling route of the moving body, and when a communication request is made, the traveling route information together with the operator recognition signal is calculated. To the base station. When the base station side receives the travel route information, it reads out the communication status information indicating the line quality level on the travel route from the communication status information of the communication carrier stored in the communication status storage means. , The travel time of the travel route section whose line quality level is equal to or higher than a predetermined value is calculated. The calculated traveling time information is transmitted to the mobile station side. The communication control means on the mobile station side, when the communication required time for information communication is shorter than the traveling time,
By controlling the information communication in the travel route section, it is possible to prevent a communication error caused by the deterioration of the line quality in the wireless section.

According to the present invention of claim 8, the traveling route of the moving body is calculated by the traveling route calculating means on the side of the mobile station, and the communication condition information or the traffic information on the traveling route is downloaded together with the operator recognition signal. The request signal is transmitted to the base station. When receiving the download request signal, the base station side selects from the communication status information of the operator stored in the communication status storage means, the communication status information indicating the line quality level on the travel route and the traffic. The traffic information stored in the information storage means is read out and transmitted to the mobile station side. The mobile station side calculates, based on the communication status information or the traffic information received from the base station, the travel route section in which the line quality level is a predetermined value or more and the travel time of the travel route section, and the communication control means determines the information. If the communication time required for communication is shorter than the travel time, it is caused by deterioration of the line quality in the wireless section by controlling the information communication within the travel route section with good line quality. It is possible to prevent a communication error that occurs.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a diagram showing a system configuration of a mobile communication system 1 according to a first embodiment of the present invention. The mobile communication system 1 includes a base station 3 (fixed station) and a mobile station 5 mounted on a vehicle, and performs data communication via a wireless line.

First, the configuration of the base station 3 will be described.

The communication status database 7 is a rewritable hard disk and stores communication status information corresponding to absolute position information on map information and indicating the line quality level calculated based on the electric field strength of the radio wave medium. There is. Since the line quality level differs depending on the line provider, it is stored for each line provider. When the communication service provider is performing digital communication, communication status information indicating the line quality level calculated based on the bit error rate is stored.

The database reading unit 9 reads out the communication status information stored in the communication status database 7 based on the carrier recognition signal and the traveling route information transmitted from the mobile station 5 side.

The line quality level comparison unit 11 converts a data string related to data communication into a voice signal based on the communication status information read from the communication status database 7 via the database reading unit 9, or a deemed voice communication method, or Select one of the data communication methods. If the line quality level is above the data communication threshold, select the data communication method. If the line quality level is below the data communication threshold and above the deemed voice communication threshold, consider the deemed voice communication method. Select. If it is less than the deemed voice communication threshold, the communication is stopped. If you select the data communication method and the line quality is good,
While the redundancy of error correction control is suppressed to improve the transmission efficiency, when the line quality deteriorates, the redundancy of error correction control is increased to prevent communication errors.

The deemed voice signal generator 13 converts a data string relating to data communication into a voice signal when receiving a mere voice communication start request signal from the communication controller 17.
It is output to the transmitting / receiving unit 15. The transmitter / receiver 15
It has an antenna and transmits / receives data to / from the mobile station 5 side via a wireless line. The communication control unit 17 controls the entire base station 3.

Next, the configuration of the mobile station 5 will be described.

A GPS (Global Positioning System) antenna 21 receives radio waves from a positioning satellite and outputs a received signal to a vehicle position measuring section 23. Own vehicle position measuring unit 23
Calculates the current position information of the vehicle based on the signal received from the GPS antenna 21. When the GPS antenna 21 cannot receive the radio wave from the satellite, the vehicle position measuring unit 2
3 receives a detection signal from a gyro sensor 25 that detects an azimuth angle of the vehicle and a distance sensor 27 that calculates a traveling distance from the number of rotations of the wheels, and performs autonomous positioning of the vehicle by estimating the current position by a cumulative calculation method. Position your current location. In addition, the vehicle position measuring unit 23 determines the traveling direction based on the locus of the vehicle.

As the input unit 29, a touch panel or the like arranged on the screen of the monitor is used for menu selection and the like. A liquid crystal display or the like is used as the monitor 31.
The road map database 33 is a CD-ROM (Compact Disk as Read) storing road map data necessary for searching.
Only Memory) or the like is used, and the road map data is read by the database reading unit 35.

The route searching unit 37 is connected to the database reading unit 3
5 and the road map data read by the input unit 29.
Based on the destination information and the search condition input in step 2, the travel route information to the destination represented by the predicted position information is calculated. The transmitting / receiving unit 39 has an antenna and transmits / receives data to / from the base station 3 side via a wireless line. In addition, when transmitting / receiving the data, the transmitting / receiving unit 39 transmits an operator recognition signal for identifying the provider of the line to be used together with the data. The control unit 41 controls the mobile station 5 as a whole.

Next, the operation on the mobile station 5 side will be described using the flowchart shown in FIG. The processing program according to this flowchart is controlled by the control unit 41.

In step S10, the GPS antenna 21
The reception information received by and the detection signals transmitted from the gyro sensor 25 and the distance sensor 27 are transmitted to the vehicle position measuring section 23. Then, the vehicle position measuring unit 23 measures the current position information of the vehicle from the received information and the detection signal transmitted, and the current position information is transmitted to the control unit 41.

In step S20, the operator sets destination information and route search conditions via the input unit 29. The control unit 41 transmits the current position information measured by the vehicle position measuring unit 23, the destination information and the route search condition information set via the input unit 29 to the route search unit 37. Then, the road map information around the current position is read from the road map database 33 using the database reading unit 35, and the current position information and the destination information are associated with each other and recorded in the road map database 33 based on the known Dijkstra method or the like. Search for nodes and road links that are
Create route data of a recommended travel route that satisfies the set route search conditions. The created travel route is displayed on the monitor 31 overlaid on the map information.

Next, in step S30, it is determined whether or not the operator selects a communication request menu via the input unit 29 to start communication. To start communication,
In step S40, the control unit 41 adds the current position information of the vehicle, the traveling direction information, and the traveling route information to the communication start request signal and transmits the signal to the base station 3 side. Further, at this time, a business operator recognition signal is also transmitted.

In step S50, it is determined whether communication control information has been received from the base station 3 side. For example, as shown in FIG. 4, a data communication start request at the current position, L11
Deemed voice communication start request at [km] point, L12 [k
m] point to stop communication, L13 [km] point to consider voice communication start request, L14 [km] point to start data communication start request, L15 [km] point to consider voice communication start request, L16 [km] point data The communication control information indicating that the communication start request is to be made is received, and the process proceeds to step S60.

In step 60, a data communication start request signal is transmitted to the base station 3 at the current position based on the received communication control information, and data communication is performed from the current position to L11 [km]. Then, when reaching the point L11 [km], the deemed voice communication start request signal is transmitted to the base station 3, and the deemed voice communication is performed between L11 [km] and L12 [km]. When reaching the point L12 [km], a communication stop request signal is transmitted to the base station 3,
Communication is stopped between [km] and L13 [km] because it is outside the communication range. Similarly, at the point L13 [km], the deemed voice communication start request signal is transmitted to the base station 3 and L13 [km] is transmitted.
~ L14 [km] between the deemed voice communication, L14
A data communication start request signal is transmitted to the base station 3 at the [km] point, data communication is performed between L14 [km] to L15 [km], and a deemed voice communication start request signal is sent to the base station 3 at the L15 [km] point. Is transmitted, and L15 [km] to L16 [k
m], the deemed voice communication is performed, and a data communication start request signal is transmitted to the base station 3 at the point L16 [km].
Data communication is performed between [km] and K [km].

Next, the operation on the base station 3 side will be described using the flowchart shown in FIG. The processing program according to this flowchart is controlled by the communication control unit 17.

In step S110, when the communication start request signal is received from the mobile station 5 side via the transmitting / receiving sections 39 and 15, in step S120, the communication control section 17
From the communication status information of the business operator specified by the business operator recognition signal, the communication status information from the current position to the destination point K [km] from the current position to the destination along the travel route is read from the communication status database 7 as a database. Read out via the unit 9.

In step S130, the line quality level comparison unit 11 regards the line quality level as a threshold and compares it with a voice communication threshold to make a communication determination, and calculates the number of times communication is stopped and the number of times a communication start request is issued.

4 and 5 are examples showing the relationship between the distance from the current position and the line quality level. The horizontal axis represents the distance along the travel route from the current position, and the vertical axis represents the line quality level. It is assumed that the data communication threshold value at which data communication is bad is E1, and the deemed voice communication threshold value at which deemed voice communication is bad is E0. Here, the data communication threshold value E1 ≧ the deemed voice communication threshold value E0.

In FIG. 4, the line quality level is L11.
Between [km] and L14 [km] and between L15 [km] and L1
Within 6 [km], it is less than the data communication threshold value E1,
It is less than the deemed voice communication threshold E0 between L12 [km] and L13 [km]. As shown in the figure, when the communication stop request is made twice or more from the current position to the point K [km] and the communication start request is made,
It proceeds to step S160.

On the other hand, in FIG. 5, the line quality level is
It is less than the data communication threshold value E1 between L17 [km] and K [km], and is less than or equal to the deemed voice communication threshold value E0 between L18 [km] and K [km]. As shown in the figure, if the communication stop request is made once from the current position to the point K [km] and the communication start request is not made, the process proceeds to step S150.

In step S150, the communication controller 17
Performs a communication stop request at the point L18 [km] shown in FIG. 5, and thereafter, there is no point where communication can be resumed up to the point K “km”. Therefore, the distance K for reading the communication status information is doubled, Repeat step S120.

In step S120, the traveling direction side 2K [km] from the current position to the destination is again set along the travel route.
The communication status information up to the point is read from the communication status database 7 via the database reading unit 9. At this time, since the communication status data from the current position to the point K [km] has already been read, the communication status information from the point K [km] to 2K [km] may be read.

At steps 130 to 140, as a result of reading the communication status information and making a communication judgment, a communication request is made L
2K from the 18km point along the travel route
If there is no point where the line quality level is considered to be equal to or higher than the voice communication threshold value E0 by the [km] point, the communication status information up to the 4K [km] point which is further doubled is read out. The line quality level is regarded as a voice communication threshold E
The processing from step S120 to step S140 is repeated until there is a point that becomes 0 or more.

Although the distance read from the communication status database 7 is twice the distance read last time after the second time, the read distance may be added by K.
It may be an integral multiple of the previously read distance. Also, K
It is also possible to add a number obtained by multiplying K by an integer.

In step S160, a communication judgment is made based on the communication status information.

For example, in FIG. 4, L1 from the current position
Up to 1 [km], since the line quality level is equal to or higher than the data communication threshold value E1, data communication is performed and L11 [k]
From m] to L12 [km], it is determined that the deemed voice communication is performed because it is equal to or more than the deemed voice communication threshold E0 and less than the data communication threshold E1. In addition, L12 [k
From m] to L13 [km], it is determined that the communication is stopped because it is less than the deemed voice communication threshold E0 and is out of the communication range. Hereinafter, similarly, L13 [km] to L14
Deemed voice communication between [km], L14 [km] to L1
Data communication between 5 [km], L15 [km] to L16
Deemed voice communication between [km], L16 [km] -K
It is determined that data communication is performed between [km].

On the other hand, in FIG. 5, L1 from the current position
Up to 7 [km], since the line quality level is equal to or higher than the data communication threshold value E1, data communication is performed and L17 [k]
From m] to L18 [km], it is determined that the deemed voice communication is performed because it is greater than or equal to the deemed voice communication threshold E0 and less than the data communication threshold E1. In addition, L18 [k
From m] to L19 [km], it is determined that the communication is stopped because it is less than the deemed voice communication threshold E0 and is out of the communication range. Hereinafter, similarly, L19 [km] to L20
Deemed voice communication between [km], L20 [km] -4K
It is determined that data communication is performed between [km].

In step S170, step S160
The communication control information for causing the communication as determined in step 1 is transmitted to the mobile station 5 side.

In FIG. 4, a data communication start request signal at the current position, a deemed voice communication start request signal at the L11 [km] point, a communication stop request signal at the L12 [km] point, and L
Deemed voice communication start request signal, L1 at 13 [km] point
Data communication start request signal, L15 [k] at 4 [km] point
m] point, deemed voice communication start request signal, L16 [k
At the point m], the communication control information for controlling the data communication start request signal to be transmitted to the base station 3 is transmitted to the mobile station 5.

In this way, when the traveling route of the vehicle is predetermined and the line condition is good at the beginning of communication and the line quality is expected to be poor during movement, the communication is performed before the line becomes bad. A stop request is issued to complete the end call control. When the line is good, data can be transmitted and received at the time when the call termination control is performed, so that the communication time can be shortened as compared with the communication method in which the data is retransmitted from the beginning.

Also, by installing the communication status database 7 on the base station 3 side, the mobile station 5 side can always perform communication control with the latest communication status information.

(Second Embodiment) FIG. 6 shows a second embodiment of the present invention.
It is a figure which shows the system configuration of the mobile communication system 40 which concerns on embodiment of FIG.

The feature of the mobile communication system 40 is that the base station 41 is provided with a traffic information database 51, a database reading section 53, and an average moving speed calculating section 55.

The traffic information database 51 is a rewritable hard disk in which traffic information representing the average moving speed data, average moving time data, etc. of vehicles for each dynamic road link is stored. Read out. The dynamic traffic information is obtained from sensors installed on the road side that measure the traffic volume. In addition, the vehicle speed obtained from the vehicle speed sensor of the vehicle is transmitted to the base station 4 using the communication means.
You may make it transmit to 1. Average travel time calculation unit 5
5 is for calculating the average travel time of a predetermined section based on the traffic information read from the traffic information database 51 via the database reading unit 53.

The other structure is the same as that shown in FIG. 1, and the detailed description thereof will be omitted by giving the same reference numerals.

Next, the operation on the mobile station 43 side will be described using the flowchart shown in FIG. The processing program according to this flowchart is controlled by the control unit 41.

Similar to the first embodiment, step S1
At 0, the reception information received by the GPS antenna 21 and the detection signals transmitted from the gyro sensor 25 and the distance sensor 27 are transmitted to the vehicle position measuring section 23. Then, the vehicle position measuring unit 23 measures the current position information of the vehicle from the received information and the detection signal transmitted, and the current position information is transmitted to the control unit 41.

In step S20, the operator sets destination information and route search conditions via the input unit 29. The control unit 41 transmits the current position information measured by the vehicle position measuring unit 23, the destination information and the route search condition information set via the input unit 29 to the route search unit 37. Then, the road map information around the current position is read from the road map database 33 using the database reading unit 35, and the current position information and the destination information are associated with each other and recorded in the road map database 33 based on the known Dijkstra method or the like. Search for nodes and road links that are
Create route data of a recommended travel route that satisfies the set route search conditions. The created travel route is displayed on the monitor 31 overlaid on the map information.

Next, in step S30, it is determined whether or not the operator selects the communication request menu via the input unit 29 to start communication. To start communication,
In step S40, the control unit 41 adds the current position information of the vehicle, the traveling direction information, and the traveling route information to the communication start request signal and transmits the signal to the base station 41 side. Further, at this time, a business operator recognition signal is also transmitted.

In step S210, it is determined whether or not the communication available time information has been received from the base station 41 side. For example, as shown in FIG. 9, when communication available time information indicating that L31 / Vave [time] data communication can be performed between the current position and L11 [km] is received, the process proceeds to step S220. move on.

In step 220, it is determined whether or not data communication can be performed within the communicable time. The communicable time information is compared with the communication required time required to perform the data communication. If the communicable time is longer, the process proceeds to step 230, and a data communication start request signal is sent to the base station 3 at the current position. Transmission is performed and communication control is performed so that data communication is performed from the current position to L31 [km].

On the other hand, if the required communication time is longer, the process proceeds to step 240, and it is displayed on the monitor 31 that the data communication cannot be performed within the communicable time, or by voice output. Notify the user. In this case, the user stops the vehicle at a safe place before reaching the L31 [km] point,
Data communication can be completed.

Next, the operation on the base station 41 side will be described using the flowchart shown in FIG. The processing program according to this flowchart is controlled by the communication control unit 57.

In step S310, when the communication start request signal is received from the mobile station 43 side via the transmitting / receiving sections 39 and 15, in step S320, the communication control section 57.
From the communication status information of the business operator specified by the business operator recognition signal, from the communication status database 7 to the communication status information from the current position to the destination point K [km] along the travel route. The data is read via the database reading unit 9.

In step S330, the line quality level comparison unit 11 compares the line quality level with the data communication threshold value E1 to make a communication determination.

FIG. 9 is an example showing the relationship between the distance from the current position and the line quality level. The horizontal axis represents the distance along the travel route from the current position, and the vertical axis represents the line quality level. Let E1 be the data communication threshold value at which data communication becomes defective. The line quality level is L31 [km] to K
It is less than the data communication threshold value E1 during [km].

In the figure, from the current position, L31 [k
up to m], the line quality level is the data communication threshold value E1.
Because of the above, data communication is performed and L31 [km] to K
During [km], it is determined that the data communication is stopped because it is less than the data communication threshold value E1 and is out of the communication range.

In step S340, the traffic information is read from the traffic information database 51 via the database reading unit 53. The average travel time calculation unit 55 calculates the average travel speed Vave of the vehicle from the current position to L31 [km] based on the read traffic information. Then, from the calculated average moving speed Vave, L31 [k
[m]] is calculated. Here, the average travel time = L31 / Vave. This average travel time is the time required for the vehicle to travel within the section where data communication is possible. In step S350, this average travel time is transmitted to the mobile station 43 side as the communicable time.

As described above, when the traveling route of the vehicle is predetermined and it is predicted that the line condition is good at the beginning of communication and the line quality becomes poor during the movement, the communication required time and the communication available time are If the communication available time is longer, the communication is controlled to start, and if the communication required time is larger, it is impossible to perform the data communication within the communication available time. By displaying this on the monitor 31 or outputting it by voice to notify the user, data communication can be performed without causing communication failure.

(Third Embodiment) FIG. 10 is a diagram showing a system configuration of a mobile communication system 70 according to a third embodiment of the present invention.

A feature of this mobile communication system 70 is that a large capacity memory 83 for storing communication status information and traffic information is installed on the mobile station 73 side.

The large-capacity memory 83 is a rewritable hard disk, and is used for transmitting / receiving units 15, 3 from the communication status database 7 and the traffic information database 51 on the base station 71 side.
The communication status information and traffic information received via 9 are stored.

The line quality level comparison unit 85 reads the communication status information stored in the large capacity memory 83 and determines whether or not to start data communication.

The average traveling time calculating section 87 reads out the traffic information stored in the large capacity memory 83 and calculates the average traveling time of the predetermined section.

Next, the operation on the mobile station 73 side will be described using the flowchart shown in FIG. The processing program according to this flowchart is controlled by the communication control unit 89.

Before making a download request, the GP
The reception information received by the S antenna 21 and the detection signals transmitted from the gyro sensor 25 and the distance sensor 27 are transmitted to the vehicle position measuring section 23. Then, the vehicle position measuring section 23 measures the current position information of the vehicle from the received information and the detection signal transmitted, and the current position information is transmitted to the communication control section 89. The communication control unit 89 transmits the received current position information to the route search unit 37.

Further, the operator sets destination information and route search conditions via the input unit 29. The communication control unit 89 transmits the set destination information and route search condition information to the route search unit 37. Then, the road map information around the current position is read from the road map database 33 via the database reading unit 35, and the current position information and the destination information are associated with each other and recorded in the road map database 33 based on the known Dijkstra method or the like. The route data of the recommended traveling route is created by searching the established nodes and road links. The created travel route is displayed on the monitor 31 overlaid on the map information.

In step S410, it is determined whether or not the operator selects the download request menu via the input unit 29 to start the download. When starting the download, the process proceeds to step S420, and the communication control unit 89 adds the current position information of the vehicle, the traveling direction information, and the traveling route information to the download request signal, and then the base station 7
Send to side 1. Further, at this time, a business operator recognition signal is also transmitted.

In step S430, it is determined whether communication status information has been received from the base station 71 side. For example, as shown in FIG. 12, when the communication status information indicating the line quality level according to the distance from the current position is received, the received communication status information is stored in the large capacity memory 83.

Then, in step S440, a communication judgment is made based on the received communication status information. In FIG. 12, since the line quality level is equal to or higher than the data communication threshold value E1 from the current position to the point L51 [km], data communication is performed, and the line quality level performs data communication between L51 [km] to L52 [km]. The communication is stopped because it is out of the communication range when the threshold value is less than E1, and the same applies to L52 [km] to L53.
Data communication between [km], L53 [km] to L54
Communication stopped between [km], L54 [km] to K [km]
It is determined that data communication is performed between the two. The line quality level is set according to the model of the transmitter / receiver 39.

In step 450, while the vehicle is moving, the communication control unit 89 receives the current position information from the own vehicle position measuring unit 23, and at the point L51 [km], a communication stop request signal, L
Data communication start request signal, L53 at 52 [km] point
The communication stop request signal is output to the [km] point and the communication start request signal is output to the L54 [km] point to the base station 71 side.

Then, a section where the vehicle can communicate (for example,
When it is necessary to perform communication at L52 [km] to L53 [km] shown in FIG. 12, the control unit 41 sends the communication start request signal to the communication start points Ls [km] to L53 [km].
The route information is added and the information is transmitted to the base station 41 side. From the base station 41 side, between Ls [km] and L53 [km] (L
53-Ls) / Vave [time] When the communication possible time information indicating that the data communication can be performed is received, it is determined whether the data communication can be performed within the communication possible time. . When the communicable time is longer than the communicable time required to perform the data communication and the communicable time is longer, a data communication start request signal is transmitted to the base station 3 at the point Ls [km]. , L53 [k from the current position
The communication control is performed so that data communication is performed up to m].

On the other hand, when the communication required time is longer, the user is informed by displaying on the monitor 31 that it is impossible to perform data communication within the communicable time or by outputting by voice. To do. In this case, the user can complete the data communication by stopping the vehicle at a safe place before reaching the L53 [km] point.

Further, the communication control unit 89 of the vehicle may read the communication status data from the large capacity memory 83 and display the communicable section on the road map.

Next, the operation on the base station 71 side will be described using the flowchart shown in FIG. The processing program according to this flowchart is controlled by the control unit 81.

In step S510, when the download request signal is received from the mobile station 43 side via the transmitting / receiving sections 39 and 15, the process proceeds to step S520, and when the download request signal of the communication status information is received, the control is performed. Part 8
The communication status database 7 shows communication status information from the communication status information of the business operator specified by the business operator recognition signal from the current position to the destination point K [km] on the traveling direction along the travel route. Is read from the database via the database reading unit 9. On the other hand, if the signal is a traffic information download request signal, the control unit 81 reads the traffic information of the data communicable section represented by the route information from the traffic information database 51 via the database reading unit 53.

In step S560, the read communication status information or traffic information is transmitted to the mobile station 73 side via the transmission / reception units 15 and 39.

As described above, by downloading the communication status information along the traveling route to the destination while the line quality is stable, each business operator used by the transceiver unit installed in the vehicle In addition, the user of the vehicle can know the area where communication is good while moving, and can select the most suitable communication method.

Further, by setting the data communication threshold value E1 according to the model of the transmission / reception unit 39, it is possible to perform communication control according to the performance of each model.

In this embodiment, the destination is set before traveling, and it is determined that the communication status information along the traveling route is collectively downloaded in advance after the traveling route is searched. You may decide to download along with movement.

[Brief description of drawings]

FIG. 1 is a mobile communication system 1 according to a first embodiment.
2 is a diagram showing a system configuration of FIG.

FIG. 2 is a mobile communication system 1 according to the first embodiment.
5 is a flowchart for explaining the operation of the mobile station 5 side.

FIG. 3 is a mobile communication system 1 according to the first embodiment.
5 is a flowchart for explaining the operation of the base station 3 side of FIG.

FIG. 4 is a graph showing changes in the line quality level from the current position to the point K [km].

FIG. 5 is a graph showing a change in line quality level from the current position to a point of 4K [km].

FIG. 6 is a mobile communication system 4 according to the second embodiment.
It is a figure which shows the system configuration of 0.

FIG. 7 is a mobile communication system 4 according to the second embodiment.
7 is a flowchart for explaining the operation of the mobile station 43 side of 0.

FIG. 8 is a mobile communication system 4 according to the first embodiment.
6 is a flowchart for explaining the operation of the base station 41 side of 0.

FIG. 9 is a graph showing changes in the line quality level from the current position to the point K [km].

FIG. 10 is a diagram showing a system configuration of a mobile communication system 70 according to a third embodiment.

FIG. 11 is a flowchart for explaining the operation on the mobile station 73 side of the mobile communication system 70 according to the third embodiment.

FIG. 12 is a graph showing changes in the line quality level from the current position to the point K [km].

FIG. 13 is a flowchart for explaining an operation on the base station 71 side of the mobile communication system 70 according to the third embodiment.

FIG. 14 is a diagram showing a system configuration of a conventional communication system.

[Explanation of symbols]

1, 40, 70 Mobile communication system 3, 41, 71 base stations 5, 43, 73 mobile stations 7 Communication status database 11,85 Line quality level comparison unit 13 Deemed audio signal generator 15, 39 Transmitter / receiver 17, 57, 89 Communication control unit 23 Own vehicle position measurement unit 33 Road map database 41, 81 control unit 55,87 Average travel time calculator 83 large capacity memory

Front Page Continuation (72) Inventor Nao Suzuki, 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (56) Reference JP-A-7-66764 (JP, A) JP-A-9-23476 (JP) , A) JP 5-199167 (JP, A) JP 7-123043 (JP, A) JP 6-85872 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) H04B 7/24-7/26 H04Q 7/00-7/38

Claims (8)

(57) [Claims] 1. A mobile communication system for performing information communication between a mobile station mounted on a mobile body and a base station via a wireless line, wherein the base station side is connected to the map information to connect to the line. Communication status storage means for storing communication status information indicating the quality level, communication status reading means for reading the communication status information at the predicted position when the predicted position information is received from the mobile station, and communication status information based on the communication status information. And a communication method selecting means for selecting any one of a plurality of communication methods, and a communication method transmitting means for transmitting communication method information indicating the selected communication method to the mobile station side. The side is a predicted position calculating means for calculating the predicted position information of the mobile body, a predicted position transmitting means for transmitting the calculated predicted position information to the base station side when a communication request is made, and a base station side. Communication method information from A communication system receiving means for signal, when the moving body reaches the predicted position based on the received communication method information, the mobile communication system characterized by having a communication control means for performing communication control. 2. A mobile communication system for performing information communication between a mobile station mounted on a mobile body and a base station via a wireless line, wherein the base station side is connected to a map in correspondence with the map information. Communication status storage means for storing communication status information indicating the quality level, communication status reading means for reading the communication status information on the travel route when the travel path information is received from the mobile station, and communication status information based on the communication status information. And a communication method selecting means for selecting any one of a plurality of communication methods, and a communication method transmitting means for transmitting communication method information indicating the selected communication method to the mobile station side. The side includes a travel route calculating means for calculating travel route information of the mobile body, a travel route transmitting means for transmitting the calculated travel route information to the base station side when a communication request is made, and a base station side. Communication method information from A communication system receiving means for signal, when the moving body is traveling the travel route based on the received communication method information, the mobile communication system characterized by having a communication control means for performing communication control. 3. The communication system selecting means selects one of a deemed voice communication system and a data communication system for converting a data string relating to data communication into a voice signal. The mobile communication system described. 4. A mobile communication system for carrying out information communication between a mobile station mounted on a mobile body and a base station via a wireless line, wherein the base station side is connected to the map information to connect to the line. Communication status storage means for storing communication status information indicating the quality level, traffic information storage means for storing traffic information, and read communication status information on the travel route when the travel route information is received from the mobile station side. Communication status reading means, section searching means for searching a travel route section whose line quality level is equal to or higher than a predetermined value, travel time calculating means for calculating a travel time of this travel route section based on traffic information, and this travel When a communication request is made, the mobile station has travel time transmission means for transmitting time information to the mobile station side, and the mobile station side calculates travel path information from the current position to the predicted position. The traveling route transmitting means for transmitting the traveling route information to the base station side, the traveling time receiving means for receiving the traveling time information from the base station side, and the communication required time for information communication are shorter than the traveling time. In this case, the mobile communication system is provided with a communication control unit that controls to perform information communication within a travel route section. 5. A mobile communication system for performing information communication between a mobile station mounted on a mobile unit and a base station via a wireless line, wherein the base station side is connected to the line information in correspondence with map information. The communication status information or traffic information on the travel route is based on the communication status storage means for storing the communication status information indicating the quality level, the traffic information storage means for storing the traffic information, and the download request signal from the mobile station side. It has a communication status transmitting means for reading out and transmitting this communication status information or traffic information to the mobile station side, and the mobile station side, travel route calculation means for calculating travel route information from the current position to the predicted position, It is received and download request signal transmitting unit, the communication status information or traffic information from the base station for transmitting a download request signal of the communication status information or traffic information on the travel route to the base station A communication status receiving means, based on the received communication state information, channel quality level Tokoro
Section search means for searching a travel route section that is equal to or greater than a fixed value
Based on the received traffic information
The travel time calculation means for calculating time and the communication required time for information communication are smaller than the travel time
In some cases, control to perform information communication within the travel route section
And a communication control means for controlling the mobile communication system. 6. A mobile communication system for carrying out information communication between a mobile station mounted on a mobile body and a base station via a wireless line, wherein the base station side is connected to the map information to connect to the line. Communication status storage means for storing the communication status information indicating the line quality level for each carrier, and when the travel route information is received from the mobile station side, the communication condition information on the travel route of the line carrier is read. A communication method selecting means for selecting any one of a plurality of communication methods based on the communication status information, and a communication method information transmitting means for transmitting the selected communication method information to the mobile station side. The mobile station side has a travel route calculation means for calculating the travel route information of the mobile body and, when a communication request is made, together with the operator recognition signal indicating the line operator to be used, the calculated travel route. Send information to the base station Communication route transmitting means, communication system receiving means for receiving communication system information from the base station side, and communication for performing communication control based on the received communication system information when the mobile body is traveling on the travel route. A mobile communication system comprising: a control unit. 7. A mobile communication system for carrying out information communication between a mobile station mounted on a mobile body and a base station via a wireless line, wherein the base station side is provided with a line corresponding to map information. Communication status storage means for storing communication status information indicating the line quality level for each carrier, traffic information storage means for storing traffic information, and when the travel route information is received from the mobile station side, the line carrier concerned Communication status reading means for reading the communication status information on the travel route, section searching means for searching the travel route section whose line quality level is equal to or higher than a predetermined value, and the travel time of this travel route section based on the traffic information. The mobile station has a travel time transmission means for calculating and transmitting travel time information to the mobile station side, and the mobile station side has travel path calculation means for calculating travel path information from the current position to the predicted position, and a communication request. Done In this case, the travel route transmission means for transmitting the calculated travel route information to the base station side together with the carrier recognition signal indicating the line carrier to be used, and the travel time reception for receiving the travel time information from the base station side A mobile communication system comprising: means and a communication control means for controlling information communication within a travel route section when a communication required time for information communication is shorter than a travel time. 8. A mobile communication system for performing information communication between a mobile station mounted on a mobile body and a base station via a wireless line, wherein the base station side is connected to the map information to establish a line. Communication status storage means for storing communication status information indicating the line quality level for each carrier, traffic information storage means for storing traffic information , and communication of the line carrier based on a download request signal from the mobile station side. From the status information, read the communication status information or traffic information on the travel route, and use this communication status information.
Alternatively, it has a communication status transmitting means for transmitting traffic information to the mobile station side, and the mobile station side indicates a traveling route calculating means for calculating traveling route information from the current position to the predicted position and a line carrier to be used. with operators recognition signal, receives a download request signal transmitting unit, the communication status information or traffic information from the base station for transmitting a download request signal of the communication status information or traffic information on the travel route calculated in the base station side Based on the communication status receiving means and the received communication status information, the line quality level is determined.
Section search means for searching a travel route section that is equal to or greater than a fixed value
Based on the received traffic information
The travel time calculation means for calculating time and the communication required time for information communication are smaller than the travel time
In some cases, control to perform information communication within the travel route section
And a communication control means for controlling the mobile communication system.