JPH10341470A - Communication channel switch device for mobile radio - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device capable of switching a communication channel at the best spot. SOLUTION: In order to switch the communication channel at the best point, the quality of radio waves such as an electric field level on a traveling road and the error rate of radio data transmission, etc., is checked beforehand and the switching spot of the communication channel is decided by the result. A radio equipment 1 is provided with map information 7, a function for storing required road map information from the map information 7 to a position information storage part, writing the traveling road on the map and writing the communication switching spot on the road, a means for calculating its own position by a GPS receiver 4 and a position calculation device 3 and the means for detecting that the written communication channel switching spot is reached.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio telephone apparatus having a function of changing a radio zone without disconnecting a traveling mobile station in a mobile communication system.

[0002]

2. Description of the Related Art Normally, in mobile communication such as a car telephone, a transceiver (mobile station) is mounted on a running car or the like,
Wireless communication is performed with a wireless base station. At this time,
A plurality of radio base stations are arranged so that communication can be performed in a wide range, and each is connected to a radio network controller. Each wireless base station has its own wireless zone within a range in which sufficient communication with the mobile station is possible, and the mobile station enables wireless communication within the wireless zone of each base station. A mobile station that is performing radio communication with a radio base station while traveling may cross the radio zone, and must switch the communication channel so that it can communicate with a radio base station in an adjacent radio zone. . The radio base station constantly monitors the reception level of the communication channel, and if the reception level drops below the specified value, it knows that the mobile station is moving out of its own radio zone, and the reception level is degraded. To the radio network controller. Upon receiving the notification, the radio network controller instructs the base station in the surrounding radio zone to monitor the reception level of the communication channel. Upon receiving the instruction, the radio base station measures the reception level of the communication channel and reports it to the radio network controller, and the radio network controller determines that the radio zone with the highest reception level is the migration destination, and the mobile station and By instructing the transfer destination wireless base station to switch to a new communication channel, the communication channel is switched and the communication is continued.

FIG. 3 is a diagram showing a conventional example described in Japanese Patent Application Laid-Open No. 2-171039. In this conventional example, as a method for shortening the communication path disconnection time at the time of switching the communication channel and performing the reliable communication channel switching, a circular wireless zone 100A centered on the wireless base station 100 shown in FIG. A center line of a portion where the circular wireless zone 101A centered on the base station 101 overlaps is defined as a boundary line 102, and a signal for changing the wireless zone is transmitted before the mobile station 103 crosses the boundary line 102. ing. That is, the mobile station has means for detecting its own position and moving direction, and means for storing the wireless zones that are controlled by the plurality of wireless base stations and the wireless zones of the wireless base stations adjacent to each other overlap. Means for recognizing a boundary area that is moving, and when the mobile station reaches the boundary area of the radio zone, notifies the radio base station of the next radio base zone to enter and switches the communication channel. .

FIG. 4 is a block diagram showing a conventional mobile communication system. In this system, the radio base station 20
2, 203, respectively, wireless zones 202A, 203A
There is a mobile station 204 that moves within the radio base station 202,
203 is connected to the radio network controller 201.

[0005]

In the above-mentioned conventional example,
A mobile station that is talking in a wireless zone of a wireless base station switches to a communication channel of an adjacent wireless base station when the mobile station crosses the wireless zone, but the switching timing is such that the reception level of the communication channel is lower than a specified value. It is when I did. The places where the reception level is deteriorated are places that are far from the wireless base station and places that are affected by the shadows of mountains and buildings, and the wireless zones of adjacent wireless base stations overlap. There are many places where the reception level is unstable over a wide range. For this reason, there is a problem that even if the communication channel is switched to the adjacent wireless base station, the deterioration of the reception level must be detected and the communication channel must be switched again.

Also, in the boundary detection method described in Japanese Patent Application Laid-Open No. 2-171039, the area where the wireless zones overlap is wide, and if the overlapping center is used as the boundary line, high-rise buildings, Depending on the terrain, road width, base station direction, etc., the electric field level is weak,
Alternatively, there is a high possibility that there are many places where the reception quality is bad due to the influence of delay dispersion. Therefore, there is a problem that there are many unstable places as switching points of the communication channel.

An object of the present invention is to provide an apparatus which can switch the communication channel at the best point to solve the above-mentioned problem.

[0008]

In order to achieve the above object, a mobile radio communication channel switching apparatus according to the present invention comprises:
A receiving unit for receiving position information of a mobile station, and a position calculating unit for processing and detecting the position information received by the receiving unit in a mobile wireless communication channel switching device including a wireless device, a control unit, and an operation unit. Means, connected to the position calculating means and the control unit, which has map information of the road on which it travels, and position information storing means for storing an arbitrary position on the map information, and has reached the stored position during a call. Means for connecting to an adjacent base station and continuing a call when detecting that, storing a predetermined point and switching a call channel at the point.

Preferably, the receiving means is a GPS receiver.

Further, it is preferable that the receiving means includes one of an azimuth sensor and a distance sensor.

Further, it is preferable that the map information is stored in a recording medium recorded on a CD-ROM, an IC card, or the like.

Further, the position calculating means reads necessary road map information from the position information storing means, and the receiving means
It is preferable to calculate its own position.

Further, it is preferable that a display means for displaying map information as an image is provided.

[0014] Still further, it is preferable that the control unit writes the communication channel switching point of the radio base zone on the display means by an operation from the operation unit.

When the control unit detects that a plurality of arbitrary positions stored by the position information storage means have reached the respective stored positions, the control unit notifies the position of the point and the time passed. Preferably, a signal is sent.

The mobile radio communication channel switching apparatus of the present invention, in particular, preliminarily examines the quality of radio waves such as the electric field level on a running road and the error rate of radio data transmission in order to switch the communication channel at the best point. The switching point of the communication channel is determined based on the result. Radio 1
Has the map information 7, stores the necessary road map information from the map information 7 in the position information storage unit, writes the running road on the map, and has the function of writing the communication channel switching point on the road. , The GPS receiver 4 and the position calculating device 3 to calculate its own position, and a means for detecting the arrival of the written communication channel switching point.

According to the present invention, a predetermined point is stored, and the communication channel is switched at that point, so that the communication channel can be switched at the point with the best condition.

Further, by storing a plurality of points and transmitting the position and time information when passing through the points, it is possible to know the running condition of the vehicle at the vehicle operation management center.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a communication channel switching apparatus for mobile radio of this embodiment. This device is a GPS (Global Positioning)
(System) The position information received by the receiver 4 is processed by the position calculating device 3 to detect its own position. Also, GPS
Even if the signal cannot be received, a CD-ROM or IC
Necessary road map information is read from the map information 7 recorded on a card or the like and stored in the position information storage unit 8, and its own position can be calculated based on information of the direction sensor 5 and the distance sensor 6.

The road map stored in the position information storage unit 8 is displayed on the display unit 8 as an image, and the operation unit 10 can write a road to be passed while viewing the image. FIG. 2 shows an example in which a road to be passed is written on a road map.

FIG. 2 is a schematic diagram showing a road map and stored positions in the embodiment of the present invention. Thick line 11 in the figure
The part written with is the road where it was written. Also, while viewing the display section 8, the operation section 10 writes the communication channel switching point 12 in the wireless base zone. The position of the user is superimposed on the road map displayed on the display unit 3 and constantly compared to determine whether or not the call channel switching point has been reached. A switching request signal is transmitted from the wireless device to switch to the channel.

[0023]

According to the mobile radio communication channel switching apparatus of the present invention, the best point for switching the communication channel is checked in advance, and that point is stored, so that the communication channel can be always switched at the best point. Becomes Therefore, by storing the point at which the communication channel is switched in advance, it is possible to detect the arrival at the point during the movement by the position detecting device, and to transmit the communication channel switching request. This has the effect of enabling handover at the point.

In addition, if a bus stop is included in one of the locations where the position information is transmitted, it is possible to know the time of passing through the point in front of the bus stop and the time of arriving at the bus stop. And provide accurate information to those waiting at the bus stop. Therefore, a vehicle that always travels on a fixed road, such as a route bus, transmits position information by a wireless device to notify the position of the vehicle. The present embodiment has the effect of storing the road on which the vehicle is traveling, storing a plurality of locations for transmitting the location information, and transmitting the location information when the bus reaches the location, thereby enabling the operation management of the bus.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a communication channel switching device of the present invention.

FIG. 2 is a schematic diagram showing a road map and stored positions according to the embodiment of the present invention.

FIG. 3 is a schematic diagram showing a conventional wireless base zone and a boundary line.

FIG. 4 is a schematic diagram showing a conventional mobile communication system.

[Explanation of symbols]

 Reference Signs List 1 wireless device 2 control unit 3 position calculating device 4 GPS receiver 5 direction sensor 6 distance sensor 7 map information 8 position information storage unit 9 display unit 10 operation unit 11 stored road unit 12 communication channel switching point 13 mobile station position 14 Radio base station 15 Radio base station 100, 101 Radio base station 100A, 101A Radio zone 102 Boundary line 103 Mobile station 201 Radio channel control station 202, 203 Radio base station 204 Mobile station 200A, 201A Radio zone

Claims (8)

[Claims] 1. A mobile radio communication channel switching device comprising a radio, a control unit, and an operation unit, wherein: a receiving unit for receiving position information of the mobile station; Position calculation means for processing and detecting; position information storage means connected to the position calculation means and the control unit, having map information of a traveling road, and storing an arbitrary position on the map information; Means for connecting to an adjacent base station and continuing the call when it detects that the stored position has been reached, storing a predetermined point, and switching the call channel at that point A communication channel switching device for mobile radio. 2. An apparatus according to claim 1, wherein said receiving means is a GPS receiver. 3. The mobile radio communication channel switching device according to claim 1, wherein said receiving means includes one of an orientation sensor and a distance sensor. 4. The method according to claim 1, wherein the map information is a CD-ROM or an I-ROM.
The mobile wireless communication channel switching device according to any one of claims 1 to 3, wherein the device is stored in a recording medium recorded on a C card or the like. 5. The apparatus according to claim 1, wherein said position calculating means reads necessary road map information from said position information storing means, and calculates its own position by said receiving means. A communication channel switching device for mobile radio according to claim 1. 6. The mobile radio communication channel switching device according to claim 1, further comprising display means for displaying said map information as an image. 7. The mobile radio communication channel according to claim 6, wherein said control unit writes a communication channel switching point of a radio base zone on said display means by an operation from said operation unit. Switching device. 8. When the control unit detects that a plurality of arbitrary positions stored by the position information storage means have reached the respective stored positions, the control unit detects the position of the point and the time passed. The mobile communication channel switching device according to any one of claims 1 to 7, wherein the communication channel switching device transmits a signal indicating the communication.