JP3469480B2 - Wireless systems - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless system which enables mobile stations to communicate with each other across a communication area frame even when communication by a different wireless system is designated for each communication area. It is about.

[0002]

2. Description of the Related Art Originally, one radio system adopts a single radio system, and mobile stations compatible with this radio system can communicate with each other. However, in recent years, for example, in a wireless system that has conventionally used an analog wireless system, a digital wireless system has been changed to a digital wireless system for the purpose of improving communication efficiency and improving confidential communication capability of communication contents. There is a tendency to switch the method. In this switching, it may be difficult to replace the communication devices of all the mobile stations at one time from the viewpoint of cost, and in such a case, the mobile area of the mobile station is changed to a plurality of communication areas. In order to avoid temporary confusion, wireless communication can be performed sequentially in one communication area using the conventional analog wireless method and in the other communication area using the new digital wireless method. It is conceivable to replace the method and switch the wireless method.

However, another problem arises in the case of adopting a different wireless system for each communication area. Specifically, it is a problem of a mobile station moving beyond the frame of this divided communication area. In such a mobile station, if only communication in each communication area is taken into consideration, a plurality of communication devices compatible with the wireless system of each communication area may be mounted. With such measures alone, it is not possible to communicate beyond the communication area near the boundary of the communication area.

In particular, as shown in FIG. 6, when used in a radio system of vehicles (mobile stations) 1 and 2 such as trains moving on a fixed track 9, the vehicles 1 and 2 exceed communication areas A1 and A2. If they cannot communicate with each other, the vehicles 1 and 2 cannot communicate with other vehicles 2 and 1 in the other communication area, such as an emergency report. There is a risk of falling. On the other hand, in order to prevent the occurrence of an accident due to the inability to communicate near the boundary P, the boundary P between the communication areas A1 and A2 is to be prevented.
The vehicle operation plan must be designed so that the vehicles 1 and 2 are stopped once and the wireless system of the communication device 8 is switched to confirm that there is no emergency notification, and then the vehicle restarts. You will not be able to operate the vehicle well. In FIG. 6, A1 is a digital communication area, A2 is an analog communication area, P is a boundary point between these wireless systems, 1 and 2 are vehicles as mobile stations, 8a is each vehicle 1, 2 is a digital radio mounted on the vehicle, 8b is an analog radio mounted on each of the vehicles 1 and 2, 8d is a manual switch for manually switching the radio system of the vehicles 1 and 2, and 8c is an antenna. In the vehicles 1 and 2 having such a wireless system, when the mobile station stops at the boundary point P of the communication area, the crew manually switches the manual changeover switch 8d, so that the radio to be used is changed from the analog radio 8b. It is possible to switch to the digital radio 8a or from the digital radio 8a to the analog radio 8b.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a radio system capable of communicating even between mobile stations set to different radio systems. With the goal.

[0006]

According to a first aspect of the present invention, there is provided a radio system in which a communication signal of one radio system is transmitted to a border area formed by adjoining communication areas of different radio systems. Relay station that changes to a wireless communication signal and sends it, and switching that indicates that it is a boundary area
In addition to installing a transmitter that transmits signals, mobile stations
The wireless system is switched based on the switching signal .

According to the second aspect of the present invention, in a boundary area where communication areas of different wireless systems are adjacent to each other , a switching signal indicating a boundary area is provided.
A transmitter for transmitting the
The mobile station that switches the wireless system based on the wireless system is set so as to be able to transmit and / or receive by a plurality of wireless systems.

According to a third aspect of the present invention, in a boundary area formed by adjacent communication areas of different wireless systems, a communication signal of one wireless system is converted into a communication signal of the other wireless system. The relay station that switches and transmits and the boundary area is divided into areas adjacent to each communication area.
Split signal that is different for each divided boundary area
Install a transmitter to send the
The wireless system is switched according to the signal .

According to the fourth aspect of the present invention, in a boundary area where communication areas of different wireless systems are adjacent to each other, the boundary area is adjacent to each communication area.
Divide into each area, and make a distinction for each divided boundary area.
Installed a transmitter that sends a switching signal
Is set so that transmission and / or reception can be performed by a plurality of wireless systems that switch the wireless systems according to the switching signal .

[0010]

In the wireless system according to the fifth aspect of the present invention, the transmitter transmits the switching signal from the leaky coaxial cable arranged along the moving path of the vehicle.

In the vehicle communication system according to the sixth aspect of the present invention, the transmitter is a wireless device which is arranged adjacent to the moving path of the vehicle and transmits a minute electric wave.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below. Embodiment 1. 1 is a system configuration diagram showing a wireless system according to Embodiment 1 of the present invention.
A1 is a digital communication area (hereinafter referred to as a digital communication area), A2 is an analog communication area (hereinafter referred to as an analog communication area), P is a boundary point between these two communication areas A1 and A2, and 1 is Vehicles (mobile stations) traveling in the digital communication area A1, 2 are vehicles (mobile stations) traveling in the analog communication area A2, 10 is the boundary point P
A relay station installed at the station for transmitting the communication signals SA and SD by changing the method, and 9 is a track of the vehicles 1 and 2.

2 traveling in each of the communication areas A1 and A2
The vehicles 1 and 2 run on different tracks 9 installed in parallel. Each of the vehicles 1 and 2 sends an emergency stop signal SA, SD when there is an abnormality such as a rock fall on the track 9, a car left on the track, or other line injuries, and the emergency stop signals SA, SD An emergency wireless device 5 for receiving the information is provided, and when the emergency stop signals SA and SD are received from the emergency wireless device 5, a vehicle crew member is notified via the speaker 12 and the vehicles 1 and 2 are emergency stopped. . By providing such an emergency radio device 5, not only can each vehicle 1 and 2 be stopped based on the emergency stop signals SA and SD from other vehicles on the same track 9, but also different tracks 9 It is possible to stop on the basis of the emergency stop signals SA and SD from other vehicles 2 and 1 in
The effect of preventing a vehicle accident can be enhanced.

The emergency radio unit 5 is a digital radio unit 5a that communicates the emergency stop signal SD digitally.
And an analog wireless device 5b for communicating the emergency stop signal SA in an analog manner, an antenna 5d for transmitting and receiving the emergency stop signals SA, SD, and one of the two wireless devices 5a, 5b for the antenna 5d. And a manual changeover switch 5c for selectively connecting
Emergency stop signal S by one wireless system selected by c
Communicate between A and SD.

On the other hand, the relay station 10 is installed at the boundary point P between the digital communication area A1 and the analog communication area A2, and when it receives the digital emergency stop signal SD, it transmits the analog emergency stop signal SA. On the other hand, when the analog emergency stop signal SA is received, the digital emergency stop signal SD is transmitted.

Next, the operation will be described. The vehicle 1 in the digital communication area A1 selects the digital radio device 5a, and the vehicle 2 in the analog communication area A2 selects the analog radio device 5b. In the following description of the operation, the analog communication area A2
An example will be described where an abnormality occurs.

In such a case, when the vehicle 2 in the analog communication area A2 finds any abnormality, the vehicle 2 makes an emergency stop in order to ensure the safety of the own vehicle, and the analog type wireless device 5b is used to perform the analog type operation. The emergency stop signal SA is transmitted. As a result, analog communication area A
The other vehicles in 2 receive the emergency stop signal SA and make an emergency stop. On the other hand, the vehicle 1 in the digital communication area A1 is traveling within the reporting range of the analog emergency stop signal SA because the emergency wireless device 5 selects the digital wireless device 5a. Even if it does, it will not stop.

Next, when the relay station 10 receives the analog emergency stop signal SA, it transmits the digital emergency stop signal SD. As a result, the vehicle 1 in the digital communication area A1 receives the digital emergency stop signal SD from the relay station 10 and makes an emergency stop of the vehicle 1.

In the above description of the operation, an abnormality is found in the analog communication area A2 and the analog communication area A2 is detected.
From vehicle 2 in vehicle 1 to vehicle 1 in digital communication area A1
The emergency stop notification operation to the relay station has been explained. However, even when an abnormality is found in the digital communication area A1 and an emergency stop notification is sent from the vehicle 1 in the digital communication area A1 to the vehicle 2 in the analog communication area A2, Since the analog emergency stop signal SA is transmitted via 10, the vehicles 1 and 2 can be emergency stopped.

Since the wireless system of the first embodiment does not have a function of automatically switching the wireless system of the emergency wireless device 5, the wireless system of the vehicle moving beyond the communication areas A1 and A2 is switched. The vehicle crew member confirms the boundary point P of the communication area, and manually switches the manual changeover switch 5c when passing through the boundary point P. As described above, although manual switching is required in the first embodiment, the emergency stop signal S from the other communication area A1, A2 is required.
Since you can receive A and SD and perform safety confirmation,
It is not necessary to temporarily stop the vehicle at the boundary point P as in the conventional case to check the safety, and it is possible to minimize an obstacle to the operation plan.

The boundary point P operates only in the analog communication area A2 if the digital emergency call system is used instead of the analog emergency call system in the past. It is advisable to set it at a position closer to the digital communication area A1 than to the operating area of the vehicle. As a result, it is possible to coexist with a vehicle equipped with only an analog radio device.

As described above, according to the first embodiment, the analog communication area A2 and the digital communication area A1 are provided.
At the boundary point P between the
Since the relay station 10 for transmitting the emergency stop signals SD and SA in place of the other system is installed, one communication area A
Since the emergency stop signals SD and SA emitted from the communication areas A1 and A2 can be notified to the other communication areas A2 and A1 beyond the communication area frame, the emergency stop signals can be applied to vehicles in different communication areas. SA and SD can be transmitted. And the emergency stop signal S
Since communication between A and SD has become possible, there is no need to stop the vehicle at the boundary point P for safety confirmation of accident prevention, and it is possible to design a vehicle operation plan without considering the existence of the boundary point P. it can.

Embodiment 2. 2 is a system configuration diagram showing a wireless system according to Embodiment 2 of the present invention,
In the figure, A1 is a digital communication area, A2 is an analog communication area, and A3 is these two communication areas A1 and A.
Border area adjacent to 2 and 1 is digital communication area A1
Vehicle 2 is in the analog communication area A2,
3 is a vehicle (mobile station) in the boundary area A3, and 6 is a switching signal transmitter for transmitting the switching signal S1 to the boundary area A3.

Each of the vehicles 1, 2 and 3 is provided with an emergency radio device 7 for transmitting the emergency stop signals SA and SD and receiving the emergency stop signals SA and SD when any abnormality occurs. When the emergency stop signals SA and SD are received, the vehicle crew member is notified via the speaker 12 and the vehicle is brought to an emergency stop.

Emergency radio equipment 7 provided in these vehicles
Is a digital transmitter 7a for digitally transmitting an emergency stop signal SD and a digital emergency stop signal S
Digital receiver 7b for receiving D, analog transmitter 7c for transmitting emergency stop signal SA in analog system, analog receiver 7d for receiving emergency stop signal SA in analog system, and emergency stop An antenna 7f for transmitting and receiving the signals SA and SD, and transmitters 7a and 7c and a receiver 7 of the above-mentioned two radios to the antenna 7f.
b and 7d each independently have an automatic changeover switch 7g connected in accordance with the changeover signal S1, and the transmitter and the receiver selected by the automatic changeover switch 7g communicate the emergency stop signals SA and SD. When a plurality of transmitters 7a and 7c are selected in this communication, the transmitters 7a and 7c transmit the emergency stop signals SD and SA in a time division manner. On the other hand, when a plurality of receivers 7b and 7d are selected, each of the receivers 7b and 7d independently receives the emergency stop signals SD and SA.

On the other hand, the switching signal transmitter 6 is laid along the track 9 of the vehicle over the entire boundary area A3.
This leaky coaxial cable 6a and this leaky coaxial cable 6a
a transmitter main body 6b that outputs a switching signal S1 to a, and always connects the leaky coaxial cable 6a to the boundary area A
The switching signal S1 is transmitted to the whole 3. Thus, when the leaky coaxial cable 6a is used as an antenna, its transmission area can be limitedly set to an extremely limited range around the leaky coaxial cable 6a, and therefore, as in the present embodiment. It is convenient when communicating only with the vehicle 3 moving on the predetermined track 9.

Next, the operation will be described. In each of the vehicles 1, 2 and 3, the automatic changeover switch 7g is set so that the analog transmitter 7c, the analog receiver 7d and the digital receiver 7b are selected in the analog communication area A2. The automatic changeover switch 7g is set so that all the transmitters 7a, 7c and the receivers 7b, 7d are selected in the boundary area A3, and only the digital transmitter 7a and the digital receiver 7b are set in the digital communication area A1. The automatic changeover switch 7g is set so that is selected. In the following description of the operation, a case where a failure occurs in the analog communication area A2 will be described as an example.

In such a state, first, the vehicle 2 in the analog communication area A2 makes an emergency stop to ensure the safety of its own vehicle when any abnormality is detected, and at the same time, the analog type radio 7c is used. An analog emergency stop signal SA is transmitted. As a result, the other vehicles 3 in the analog communication area A2 and the boundary area A3
Receives the emergency stop signal SA and makes an emergency stop. On the other hand, for the vehicle 1 in the digital communication area A1, only the receiver 7b having a different wireless system is selected,
Even if the vehicle travels within the reporting range of the analog emergency stop signal SA, it does not stop.

However, even in such a case, by setting the distance of the boundary area A3 to be a sufficient distance equal to or more than the distance from the maximum speed to the stop of the vehicle, the communication area A1 enters the communication area A3. There is no problem because the receiver 7d is selected for the vehicle and can be received.

In the above description of the operation, an abnormality is found in the analog communication area A2 and the analog communication area A2 is detected.
Vehicle 2 in the area 3 to vehicle 3 in the digital boundary area A3
The emergency stop notification operation to the vehicle 1 in the communication area A1 has been described, but an emergency is detected from the vehicle 1 in the digital communication area A1 to the vehicle 2 in the analog communication area A2 when an abnormality is found in the digital communication area A1. Even at the time of the stop notification, the vehicles 1 and 2 can be brought to an emergency stop.
Further, when an abnormality is found in the boundary area A3, both the digital emergency stop signal SD and the analog emergency stop signal SA are transmitted at the time of the detection, so that a normal emergency stop is performed. There is no difference from when a signal is sent, and this is not a problem.

Further, in the wireless system of the present embodiment,
Leaky coaxial cable 6a laid all over the boundary area A3
The automatic changeover switch 7g of the vehicles 1, 2 and 3 is automatically set based on the changeover signal S1 from. Specifically, for example, in a vehicle that moves in the two communication areas A1 and A2, when the switching signal S1 is received, the communication areas A1 and A2 that have been the communication areas up to that time are stored and the automatic changeover switch is used. 7g is switched to the setting of the boundary area A3, and then when the switching signal S1 is not received, the communication areas A2 and A1 which are not the communication areas storing the setting of the automatic changeover switch 7g are stored.
The setting may be switched to. As described above, in the second embodiment, the switching signal transmitter 6 transmits the switching signal S1 only within a very narrow range, and the changeover switch 7g of the vehicle is automatically set according to the presence or absence of the switching signal S1. Since it is switched to, it is possible to reliably switch. Further, unlike the conventional case, it is not necessary to stop the vehicles 1, 2, 3 once at the boundary point P of the communication area to check the safety, and it is possible to minimize the obstacle to the operation plan.

The boundary point P operates only in the analog communication area A2 when the digital emergency call system is used instead of the analog emergency call system in the past. It is advisable to set it at a position closer to the digital communication area A1 than to the operating area of the vehicle. This allows the vehicle to coexist with a vehicle equipped with only an analog radio device.

As described above, according to the second embodiment, the analog communication area A2 and the digital communication area A1 are provided.
In the boundary area A3 where and are adjacent to each other, the vehicles 1, 2,
3 can receive the emergency stop signals SA and SD of both methods, and can transmit the emergency stop signals SA and SD of both methods when transmitting the emergency stop signals SA and SD. Therefore, the vehicles 1 and 2 in the different communication areas A1 and A2 can be brought to an emergency stop. Therefore,
It is no longer necessary to stop the vehicle at the boundary point P for safety confirmation ahead, and the vehicle operation plan can be designed without considering the existence of the boundary point P. Moreover, since the automatic changeover switch 7g of the vehicle can be automatically changed over without human intervention, one communication area A1,
In a vehicle moving from A2 to the other communication area A2, A1, it is possible to eliminate an accident caused by forgetting to switch.

Embodiment 3. 3 is a system configuration diagram showing a wireless system according to Embodiment 3 of the present invention,
The wireless system according to the second embodiment has a boundary area defined as a digital boundary area A4 adjacent to the digital communication area A1.
And an analog boundary area A5 adjacent to the analog communication area A2, and each divided boundary area A
Switching signal transmitters 61 and 62 for transmitting different switching signals S2 and S3 for 4 and A5 are installed, and
2, 3 and 4 are the switching signals S2 and S2 even in the boundary area.
The difference is that the wireless system is switched to S3.
In the figure, the same reference numerals as those in FIG. 2 indicate the same or corresponding portions, and therefore their explanations are omitted.

The switching signal transmitters 61 and 62 respectively include a leaky coaxial cable 6a laid along the track 9 of the vehicle over the entire divided boundary areas A4 and A5,
The leaky coaxial cable 6a and a transmitter main body 6b for outputting a signal are provided, and the leaky coaxial cable 6a always sends the switching signals S2 and S3 to the entire division boundary areas A4 and A5. Then, the switching signals S2 and S3 transmitted from the switching signal transmitters 61 and 62 are added with unique information according to the adjacent communication areas A1 and A2.

Next, the operation will be described. In the wireless system having such a configuration, the vehicles 1, 2, 3, 4 switch the setting of the automatic changeover switch 7g depending on whether or not the changeover signals S2, S3 are received. Specifically, the vehicles 1, 2,
3 and 4 are switching signal transmitters 6 in the digital boundary area A4
When receiving the switching signal S2 (hereinafter referred to as switching signal A) transmitted from No. 1, the automatic changeover switch 7g is selected so as to select the digital transmitter 7a, the digital receiver 7b and the analog receiver 7d. Switch. Then, when the switching signal A is no longer received without receiving another switching signal S3, the digital transmitter 7
The automatic changeover switch 7g is switched so as to select a and the digital receiver 7b. On the contrary, when the switching signal S3 (hereinafter referred to as switching signal B) transmitted from the switching signal transmitter 62 in the analog boundary area A5 is received, the analog type transmitter 7c, the digital type receiver 7b and the analog type transmitter 7b are used. The automatic changeover switch 7g is switched so as to select the receiver 7d. Further, if the switching signal B is not received subsequently without receiving the other switching signal S2, the automatic changeover switch is selected so as to select the analog type transmitter 7c, the analog type receiver 7d and the digital type receiver 7b. Switch to 7g. Therefore, in any case, the vehicles 3 and 4 in the boundary areas A4 and A5 can receive the digital emergency stop signal SD and the analog emergency stop signal SA, and at the same time, the digital wireless system or the analog wireless system can be used. The emergency stop signals SD and SA can be transmitted by the method.

As described above, in the third embodiment, the vehicles 3 and 4 in any of the divided boundary areas A4 and A5 perform the same function as in the first embodiment, and the communication areas A1 and A2 are Emergency stop signals SA and SD across the border
Can be communicated with, and the changeover switch 7 of the vehicle
Since g is switched based on the switching signals SA and SD, it is possible to obtain the same effect as that of the second embodiment.

Further, in the third embodiment, after receiving the switching signals S2 and S3 of 1 and subsequently not receiving the other switching signals S3 and S2, if the switching signals S2 and S3 are not received, Since it is set so as to switch to the predetermined communication areas A1 and A2, for example, after entering the digital boundary area A4 from the digital communication area A1, the original digital communication area is not escaped to the analog communication area A2. Even a vehicle that travels to return to A1 can automatically and surely return to the digital wireless system. The same applies when returning from the analog boundary area A5 to the analog communication area A3. Also, if the wireless system switching is controlled under such conditions, 3
Even in the boundary area where the above communication areas are adjacent to each other, it is possible to correctly switch to the wireless system for each communication area.

Fourth Embodiment 4 is a system configuration diagram showing a wireless system according to Embodiment 4 of the present invention,
It differs from the wireless system of the third embodiment only in that the setting of the automatic changeover switch 7g in each of the divided boundary areas A4 and A5 is different. Specifically, in each of the divided boundary areas A4 and A5, the difference is that both the digital transmitter 7a and the analog transmitter 7c are selected. In the figure, the same reference numerals as those in FIG. The operation is also similar to that of the third embodiment. Therefore, the fourth embodiment has the same effects as the third embodiment.

Embodiment 5. 5 is a system configuration diagram showing a wireless system according to Embodiment 5 of the present invention.
It differs from the wireless system of the fourth embodiment only in the switching signal transmitters 63 and 64 installed in the divided boundary areas A4 and A5. In the figure, the same reference numerals as those in FIG.

The switching signal transmitters 63 and 64 each include a small antenna 6c arranged in a position adjacent to each of the communication areas A1 and A2, and a transmitter main body 6b which outputs a signal to the small antenna 6c. The switching signals S2 and S3 are constantly transmitted from the small antenna 6c to a part of the divided boundary areas A4 and A5. Then, the switching signal S2 transmitted from each switching signal transmitter 63, 64
S3 is similar to the fourth embodiment, and is adjacent to the communication area A.
1, specific information corresponding to A2 is added.

Next, the operation will be described. In the wireless system having such a configuration, the vehicle sends each switching signal S2, S
The setting of the automatic changeover switch 7g is changed according to the reception history of No. 3. Specifically, when each vehicle 1, 2, 3, 4 receives the switching signal A (S2) in the setting state of the digital communication area A1, the digital transmitter 7a, the analog transmitter 7c, the digital transmitter 7a Automatic changeover switch 7 so as to select the receiver 7b and the analog receiver 7d
Switch g. On the contrary, when the switching signal A (S2) is received in the setting state of A4 and A5 in the boundary area, the automatic changeover switch 7g is switched so as to select the digital transmitter 7a and the digital receiver 7b. On the other hand, switching signal B (S3) in the setting state of analog communication area A2
When it receives, the automatic changeover switch 7g is switched so as to select the digital transmitter 7a, the analog transmitter 7c, the digital receiver 7b and the analog receiver 7d. Conversely, when the switching signal B (S3) is received in the setting state of the boundary areas A4 and A5, the automatic switching is performed so that the analog transmitter 7c, the analog receiver 7d and the digital receiver 7b are selected. Switch 7g. Other operations are the same as those in the fourth embodiment.

As described above, in the fifth embodiment, the switching signal transmitter 6 is provided for each of the divided boundary areas A4 and A5.
Since the switching signal transmitters 63 and 64 are provided with different switching signals S2 and S3 respectively transmitted from the switching signal transmitters 63 and 64, the same operational effect as the fourth embodiment can be obtained.

Further, particularly in the fifth embodiment, since the radio device using the small antenna 6c is used for the switching signal radio devices 63 and 64, the second to fourth embodiments described above are used.
As described above, it is not necessary to stretch the leaky coaxial cable over the entire boundary areas A4 and A5, and the labor and cost of installation can be suppressed. On the contrary, if the switching signal radios that emit different switching signals are arranged at predetermined intervals along the track 9 of the vehicle, the vehicle is made to know the traveling position and the traveling direction of the vehicle is determined according to the switching signal. It can also be done.

[0046]

As described above, according to the first aspect of the present invention, the communication signal of one wireless system is transmitted to the other wireless system in the boundary area formed by the communication areas of different wireless systems being adjacent to each other. A relay station that transmits by changing to the communication signal of the method and a switching signal that indicates that it is a boundary area are transmitted.
Installed a transmitter, and the mobile station
Since the wireless system is switched based on, the communication signal from the mobile station set in the wireless system of one communication area is changed to the wireless system of the other communication area in the boundary area. it is possible to communicate with the mobile station each other are in the communication area of a different radio system, one communication et
When a mobile station moves from the rear to another communication area
Automatically and reliably switch the wireless system of the mobile station.
There is an effect that can be that.

According to the invention described in claim 2, different radios
In the border area where the communication areas of the method are adjacent to each other,
A transmitter that transmits a switching signal indicating that it is a boundary area
And the mobile station switches the wireless system based on the switching signal, the mobile station is set so as to be able to transmit and / or receive by the plurality of wireless systems. In this case, since the mobile station can transmit a communication signal of each wireless system and / or the mobile station can receive the communication signal of each wireless system, the mobile stations in the communication areas of different wireless systems can communicate with each other. Together with
A mobile station moves from one communication area to another
In this case, the wireless system of the mobile station is automatically and automatically
There is an effect that can be surely switched .

According to the third aspect of the present invention, a communication signal of one wireless system is changed to a communication signal of the other wireless system in a boundary area formed by adjoining communication areas of different wireless systems. and the relay station that to Call, boundary collar
A is divided into areas adjacent to each communication area, and
Sending a different switching signal for each border area
Installed and the mobile station does not respond to the switching signal.
Since the line system is switched , in the boundary area, the communication signal from the mobile station set to the wireless system of one communication area is changed to the wireless system of the other communication area, so that a different wireless system is used. In addition to being able to communicate between mobile stations in the communication area of the method,
Not only when the mobile station moves to another communication area,
Mobile stations that have moved from one communication area to the border area
Return to the original communication area without escape from the border area
Even if it happens, the wireless system of the mobile station is automatically
There is an effect that it is possible to switch it intentionally and surely .

According to the invention described in claim 4, in the boundary area where the communication areas of different wireless systems are adjacent to each other,
The border area is divided into areas adjacent to each communication area.
A different switching signal for each divided boundary area.
Install a transmitter that sends the signal, and the mobile station sends the above switching signal.
The wireless system is switched according to the above, and the settings are made so that multiple wireless systems can transmit and / or receive.
In the boundary area, the mobile station can transmit the communication signal of each wireless system and / or the mobile station can receive the communication signal of each wireless system, so that the mobile stations in the communication areas of different wireless systems communicate with each other. One can
When the mobile station moves from the communication area to another communication area
In addition to moving from one communication area to the border area
The original communication without the mobile station leaving the boundary area
Even when returning to the area, the radio of the mobile station
There is an effect that the system can be switched automatically and surely .

[0050]

According to the invention of claim 5 , the transmitter is:
Since the switching signal is transmitted from the leaky coaxial cable arranged along the travel route of the vehicle, the switching signal can be transmitted only to the installation area of the leaky coaxial cable and a very narrow area limited to the vicinity thereof. . Therefore, the switching signal can be transmitted only to a predetermined vehicle, and the mobile station can easily determine whether or not it is in the boundary area based on the reception / non-reception of the boundary identification signal. There is an effect that it can be discriminated without error by simple discrimination.

According to the invention of claim 6 , the transmitter is:
Since the wireless device is arranged adjacent to the moving route of the vehicle and emits a minute electric wave, it is not necessary to extend the antenna around the entire boundary area, and there is an effect that installation labor and cost can be suppressed. In addition, the vehicle side can easily determine whether the vehicle has entered the border area from the communication area or exited the border area from the communication area simply by holding the number of times the signal from the wireless device is received. There is an effect that it is possible to make a distinction without making an error.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a wireless system switching system for a vehicle according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a wireless system switching system for a vehicle according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a wireless system switching system for a vehicle according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a wireless system switching system for a vehicle according to a fourth embodiment of the present invention.

[Fig. 5] Fig. 5 is a configuration diagram of a wireless system switching system for a vehicle according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram of a vehicle wireless system switching system which is a premise of the present invention.

[Explanation of symbols]

1, 2, 3, 4 Vehicle (mobile station), 5, 7 Emergency radio equipment, 6, 61, 62, 63, 64 Switching signal transmitter (transmitter), 6a Leakage coaxial cable, 9 tracks, 10 relay stations, A1 Digital communication area (communication area), A2
Analog communication area (communication area), A3 border area, A4, A5 divided border area, SD digital emergency call signal (communication signal), SA Analog emergency call signal (communication signal), S1, S2, S3 Switching signal.

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Makoto Atsawa 2-2-2 Yoyogi, Shibuya-ku, Tokyo Inside East Japan Railway Company (56) References Japanese Patent Laid-Open No. 10-285621 (JP, A) Kai 61-205553 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 H04Q ⁷ /00-7/38

Claims (6)

(57) [Claims] 1. In a wireless system in which mobile stations communicate with each other by a wireless system designated for each communication area, a communication signal of one wireless system is provided in a boundary area where communication areas of different wireless systems are adjacent to each other. In the border area and the relay station that transmits the other communication signal of the wireless system
If you install a transmitter that sends a switching signal indicating that there is
In both mobile stations, the wireless system based on the switching signal is used.
A wireless system characterized by switching . 2. In a wireless system in which mobile stations communicate with each other by a wireless system specified for each communication area, in a boundary area where communication areas of different wireless systems are adjacent to each other, the boundary area is the boundary area. Switching signal shown
In addition to installing a transmitter for transmitting
A wireless system, characterized in that a wireless system is switched based on a switching signal and is set so as to be able to transmit and / or receive by a plurality of wireless systems. 3. In a wireless system in which mobile stations communicate with each other by a wireless system designated for each communication area, a communication signal of one wireless system is provided in a boundary area where communication areas of different wireless systems are adjacent to each other. a relay station that transmits and Henkawa the communication signal of the other radio scheme, each through a boundary area
The area that is adjacent to the communication area is divided into
Installed a transmitter that sends out a switching signal that differs for each area
At the same time, the mobile station responds to the wireless signal according to the switching signal.
A wireless system characterized by switching . 4. In a wireless system in which mobile stations communicate with each other by a wireless system specified for each communication area, in a boundary area where communication areas of different wireless systems are adjacent to each other , the boundary area is set to each communication area. Adjacent area
The boundary area is divided into
Install a transmitter to send a replacement signal and
A wireless system, wherein the wireless system is switched according to the switching signal, and the wireless system is set so as to be able to transmit and / or receive by a plurality of wireless systems. 5. The transmitter according to claim 1 , wherein the transmitter transmits the switching signal from a leaky coaxial cable arranged along a moving path of the vehicle .
The wireless system according to item 1 . 6. The transmitter according to any one of claims 1 to 4 , wherein the transmitter comprises a wireless device which is arranged adjacent to a moving route of the vehicle and transmits a minute electric wave. The wireless system as described.