JPH04255122A - Automobile telephone system - Google Patents

Abstract

PURPOSE:To make talking from the same automobile telephone terminal even when an automobile enters other radio communication service support area from one radio communication service support area. CONSTITUTION:The telephone set is provided with a control means 2, which stores a radio communication service support area sectional map of the automobile telephone set, detects a radio communication service support area section in which talking is available at a position detected by its own automobile position detector and sets and revises automatically the communication specification of the automobile telephone terminal equipment 3 into the communication specification in matching with the transmission reception specification of the detected radio communication service support area section.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a telephone device for a car, and more specifically, the present invention relates to a wireless communication service support area (hereinafter referred to as "
"Communication Service Area" for short. ) to another company's communication service area, the present invention relates to a car telephone device improved so that a call can be easily made using a car phone terminal at that location even when moving from one place to another company's communication service area.

0002

[Prior Art] A conventional car telephone device of this type is shown in FIG.
The structure was as shown in the figure below. In other words, when a vehicle equipped with a car phone is located within the communication service area A of company A, which provides car phone communication services, the radio of the car phone terminal 3 uses the transmission/reception specifications of company A. The communication specifications are set to match. Then, when the vehicle moves from company A's communication service area A to company B's communication service area B, it is necessary to change the communication specifications of the car phone terminal 3 to match the transmission and reception specifications of company B. There is. This setting change operation is so-called roaming, and conventionally, the operation was performed by pressing a push button while checking the setting display and radio wave status display contents using the car telephone receiver 4.

0003

[Problems to be Solved by the Invention] However, with such conventional car telephone devices, manual roaming must be performed each time the vehicle enters a different communication service area, which is time-consuming. Furthermore, when a car enters a different communication service area, there is a problem in that the car may not be aware of the need for roaming operations and may continue to be unable to receive data.

[0004] An object of the present invention is to solve the problem of roaming operations in conventional car telephone devices.

[0005]

[Means for Solving the Problems] In order to solve the above problems, a car telephone device of the present invention has the following features as shown in FIG.
A car phone terminal 3 that performs telephone calls with communication specifications that match the transmission and reception specifications of the communication service area, an own vehicle position detection device 10 that detects the own vehicle position, and a own vehicle position detection device 10 that stores communication service area classification map data and detects the own vehicle position. The vehicle position data detected by the device 10 is input, and the communication specifications of the in-vehicle location device 1 and the car phone terminal 3, which detect the communication service area division in which car phone calls are available at that location, are determined by the detected communication service area. It is comprised of a control means 2 that automatically changes settings to match the transmission and reception specifications of the classification.

[0006]

[Operation] As described above, the car telephone device of the present invention has the following features:
When the own vehicle enters from one communication service area section to another communication service area section, the in-vehicle location device 1 detects a communication service area section in which a car phone can be used at that location, and the communication specifications of the car phone terminal 3 are detected. However, since the settings are automatically changed to match the transmission and reception specifications of the communication service area division detected by the control means 2, there is no need for manual roaming every time the vehicle enters a different communication service area division.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a car telephone device according to the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram of a car telephone device 20 according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes an in-vehicle location device equipped with a microcomputer, and this in-vehicle location device 1 includes a geomagnetic sensor 1a that detects the traveling direction of the vehicle, and a wheel speed sensor 1b that detects the rotational speed of the wheels. The vehicle position detection device according to claim 1 is constituted by the sensors 1a and 1b), and a CD-ROM storing a map of the driving area of the vehicle for recognizing and displaying the vehicle position.
Direction detection is performed by inputting signals from the map data ROM 1c and the communication service area division map storage device 1d storing map data of the wireless communication service area division of the car phone, and detected by the geomagnetic sensor 1a and the wheel speed sensor 1b. Based on the output and the wheel rotation speed output, the current position of the own vehicle is calculated from the travel distance and direction obtained by integrating the wheel rotation speed, and the current position of the own vehicle is calculated from among the maps stored in the CD-map data ROM1C. The own vehicle position is displayed on the CRTIe along with the included map.

Furthermore, the car telephone device 20 of this embodiment
is equipped with a control device 2 consisting of a microcomputer that stores communication specifications for each communication service area classification and performs automatic roaming, and a car phone terminal 3, and the car phone terminal 3 includes a car phone radio 3a and a car phone antenna 3b.
It is configured so that it can be received and transmitted from the own vehicle's location via.

[0011] Then, based on the wireless communication service area classification of company A at the current location of the own vehicle,
When entering a wireless communication service area division, the map data and own vehicle position displayed on the in-vehicle location device 1 are combined with the wireless communication service area division map data stored in the communication service area division map storage device 1d. are superimposed and compared to detect a wireless communication service area segment in which car phone communication is possible at the location of the own vehicle, and transmit/receive the communication specifications of the car phone terminal 3 via the control device 2 of the detected wireless communication service area segment. Automatically change the settings to the communication specifications that match the specifications.

FIG. 3 is a flowchart executed by the microcomputer in the vehicle location device 1.

First, the geomagnetic sensor 1a and the wheel speed sensor 1
The detection output of b is taken in, and the obtained own vehicle position data is calculated from the travel distance and direction (step S-1).
Display and recognize the own vehicle on the corresponding map read from the CD-map data ROM 1c (steps 0 to S-2)
).

[0014] Next, data is read from the communication service area division map recording device 1d of the car phone (step S-3), and the map data that recognizes the vehicle's position is superimposed on the wireless communication service area division map data. A comparison is made (step S-4), and the wireless communication service area classification at the own vehicle position is detected (step S-5).

FIG. 4 is a flowchart executed by the microcomputer within the control device 2. First, select a communication specification that matches the wireless communication service area classification detected by the in-vehicle location device 1 (step S-6),
Next, the communication specifications of the car phone terminal 3 are automatically changed to match the selected communication specifications (step S-7).
.

Therefore, since the transmission and reception specifications of the automobile radio 3a are automatically changed to match the transmission and reception specifications of the wireless communication service area classification, transmission and reception can be performed via the automobile antenna 3b without any manual operation. Be able to do it.

Another embodiment of the roaming operation of the car telephone device of the present invention is shown in FIG.

The flowchart in FIG. 5 makes it possible to detect areas where there is no communication service area for car phones, and to notify that the car phone cannot be used. Executed by a microcomputer. In accordance with the same processing procedure as the flowchart of FIG. 3, the process up to step S-4 is performed to compare the map data that recognizes the vehicle's position with the communication service area division map data. Thereafter, it is detected whether or not the own vehicle exists within the communication service support area classification of any car phone (step S-1).
0), if it is outside the service support area, a message that calls are not possible is output to the user (step S-11). Also, if you are within one of our service support areas,
The process advances to detection of the communication service support category at the vehicle's location (step S-5). Thereafter, automatic roaming operations similar to those in the embodiment described in FIG. 4 are performed.

Although the above-described embodiment has been described using the geomagnetic sensor 1a and the wheel speed sensor 1b as the own vehicle position detecting device, the present invention is not limited to this embodiment. For example, by using multiple satellites, a satellite transmits navigation data that informs the three-dimensional position of each satellite on radio waves at a predetermined timing, an antenna receives the radio waves from these satellites, and an internal clock is used to transmit navigation data at a predetermined timing. It is also possible to use a position measuring device that utilizes the Global Position System (hereinafter referred to as "GPS"), which consists of a calculation device that analyzes navigation data received from multiple satellites and calculates the position (hereinafter referred to as "GPS"). 1986-13
No. 7086 Specification P. 1~P. 2), and Japanese Patent Application Laid-Open No. 13708/1986, which improved this GPS position measuring device.
The "vehicle position measuring device" described in No. 6 may also be used. Furthermore, with the "positioning and message transmission system and method using satellites and stored topographical maps" as disclosed in the specification of Japanese Patent Application Laid-Open No. 61-48781,
The position of the vehicle may be detected using an artificial satellite.

[0020]

[Effects of the Invention] As is clear from the above description, the car phone device of the present invention automatically detects the location of the own vehicle, detects the communication service area classification at that location, and makes it possible to use the car phone. Since the device is configured to automatically change the settings of the terminal specifications (roaming), there is no need to manually perform roaming operations when making a call from a car phone. In addition, when the communication service support category of the car phone changes as the vehicle moves, the communication specifications of the car phone terminal can be automatically changed to match the transmission and reception specifications of the communication service support category. roaming operations are no longer required.

Furthermore, the above-described embodiment has the following effects in addition to the above-mentioned effects.

[0022] If the communication service areas overlap,
By selecting a communication service area category with low service charges and automatically changing the communication specification settings (roaming) of the car phone terminal, it is possible to save on car phone call charges.

[Brief explanation of the drawing]

FIG. 1 is a basic configuration block diagram of the present invention.

FIG. 2 is a basic configuration block diagram of an embodiment of a car telephone device of the present invention.

FIG. 3 is a flowchart executed by a microcomputer in the on-vehicle location device shown in FIG. 2;

FIG. 4 is a flowchart executed by a microcomputer in the control device shown in FIG. 2;

FIG. 4 is a flowchart of the operation sequence of another embodiment of changing communication specification settings of a car phone terminal in the car phone device shown in FIG. 2;

FIG. 6 is an explanatory diagram illustrating a receiving/calling state of a conventional car telephone device in different wireless communication service area divisions.

[Explanation of symbols]

1 Vehicle-mounted location device 1a Geomagnetic sensor 1b Wheel speed sensor 1c CD-map data ROM 1d Car phone communication service area classification map storage device 2 Control device (roaming operation control device) 3 Car phone terminal 3a Car phone radio 3b Car telephone antenna

Claims (1)

[Claims] [Claim 1] A car telephone terminal that performs telephone calls with communication specifications that match the transmission and reception specifications of a wireless communication service support area classification, and a vehicle position detection device that detects the vehicle position.
An in-vehicle location that stores wireless communication service support area division map data, inputs own vehicle position data detected by the own vehicle position detection device, and detects a wireless communication service support area division in which a car phone can be made at that location. 1. A car telephone device comprising: a device; and a control means for automatically changing the communication specifications of the car phone terminal to match the transmission and reception specifications of the detected wireless communication service support area classification.