JP2001243593A - Traffic signal control method and traffic signal control system in mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a traffic signal control method for a handicapped person and a traffic signal control system for the handicapped person in a mobile communication system capable of being accurately operated at a low cost by utilizing a portable telephone rapidly becoming popular at present. SOLUTION: A mobile station for which a handicapped person service class is set to subscriber data inside a home location register and a signal device base station for which the vicinity of a traffic signal device where the handicapped person crosses is used as a service area and the area is set to a single position registration area are provided. The mobile communication system recognizes that the handicapped person carrying the mobile station is to cross a road and sends out signal device control signals corresponding to respective handicaps to the traffic signal device of the crosswalk. Thus, the handicapped person is supported.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traffic signal control method and a traffic signal control system in a mobile communication system, and more particularly, to a traffic signal control method and a control system for a disabled person having a portable telephone.

[0002]

2. Description of the Related Art Conventional traffic signal control methods for persons with disabilities use the following control methods according to the situation of persons with disabilities. Traditional traffic signal control methods for the visually impaired
When a visually impaired person pressed the pushbutton switch for the visually impaired, which was installed near the traffic light on the road to be crossed, a request was made to the traffic light to activate the visually impaired crossing guidance sound. .

[0003] Further, as disclosed in, for example, Japanese Patent Application Laid-Open No. 4-69799, information required between a traffic signal on a road to be traversed using individual radio and a terminal possessed by a visually impaired person is disclosed. By communicating, the visually impaired person is notified of the existence of the traffic light, and the terminal of the visually impaired is transmitted to the traffic light from the terminal of the visually impaired to guide the traffic light so that the visually impaired person can safely cross the road. A device that issues an activation request is known.

[0004] The conventional traffic signal control method for persons with walking disabilities has not taken particular measures. This is because the content supporting the person with walking disability is focused on barrier-free, which eliminates steps and grooves on roads, and has not led to controlling traffic lights.

[0005]

As described above, the conventional traffic signal control method for the disabled has the following problems. In a conventional traffic signal control method for the visually impaired, a radio transceiver is provided at a traffic signal on a road to be traversed, and a new communication method for performing information communication with the radio transceiver for the traffic signal is provided. The mobile terminal had to be carried by the visually impaired. For this reason, a new mobile terminal is required, and this mobile terminal is a dedicated terminal that performs only communication with a traffic signal, and there is a problem that the cost is increased accordingly.

In the conventional traffic signal control method for persons with walking disabilities, the green light time for cars is allocated more because the emphasis is placed on eliminating traffic congestion on the road where automobiles and the like pass, and the green light time for pedestrians is handicapped. It is a time based on a normal pedestrian who does not have a pedestrian, and it cannot be said that a pedestrian with a disability has sufficient green light time to cross a road. Also, in the background where sufficient green light time for crossing the road cannot be allocated to the person with walking disability, the fact that the person with disability is trying to cross with a push button switch etc. With the method of notifying the traffic light, ordinary pedestrians may want to secure their own green light time, and may perform false push button operation too much, which may hinder the overall traffic light control operation . In short, there was a problem that there was no way to exclude a false notification to a traffic signal and accurately notify that a person with a walking disability is crossing a road.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a handicapped person carrying a mobile station (mobile station) tries to cross a road by using a mobile phone (mobile station) which is now rapidly spreading. Then, the mobile communication system automatically recognizes the disabled person and performs a traffic signal control operation in accordance with the service class of the disabled person registered in advance. It is an object to provide a method and a traffic signal control system.

[0008]

A traffic signal control method and a traffic signal control system in a mobile communication system according to the present invention which have been made to solve the above-mentioned problems are provided only in a mobile station owned by a disabled person and in the vicinity of a crosswalk. A traffic signal base station to make a service area, a mobile communication system including a base station, a mobile subscriber exchange, and a home location register connected to the traffic signal base station by a radio line, a traffic signal control unit connected to the traffic signal base station, It consists of traffic lights,
(A) When the mobile station enters the service area of the signal base station, the mobile station sends a channel switching request to the signal base station. (B) The signal base station receives the channel switching request and passes through the base station. Means for sending a location registration request to the mobile subscriber exchange by means of: (c) the mobile subscriber exchange receives the location registration request and determines that the mobile station is disabled and that the disabled person having the mobile station is on the road. Means for recognizing that the user has entered the pedestrian crossing area to cross the road, and (d) the mobile subscriber exchange recognizes that the disabled person is about to cross the road, and then passes the traffic light via the base station and the traffic light base station. Means for transmitting a signal setting signal to the control unit; and (e) means for receiving the signal setting signal and providing a handicap support to the traffic signal according to the respective handicap, ie, a visual impairment. Means to broadcast a guidance signal for visually impaired persons in conjunction with the green light of the pedestrian crossing, and means for extending the green light time of the pedestrian crossing for persons with walking disabilities. .

Further, the means for transmitting the location registration request sets in advance the service area of the traffic signal base station to be a single location registration area in the setting at the time of construction of the traffic signal base station. It is characterized in that the received signal base station has means for sending a location registration request.

Further, the means for recognizing that the mobile station is a visually impaired means includes: when registering the mobile station possessed by the visually impaired person in the mobile communication system in advance, sets the service class of the subscriber data in the home location register. It is set for a visually impaired person, and is characterized by having means for recognizing that a mobile station is a visually impaired person in a mobile subscriber exchange that has read a service class of subscriber data.

The means for recognizing that the mobile station is a person with a walking disability includes, when registering in advance the mobile station possessed by the person with a walking disability in the mobile communication system, sets the service class of the subscriber data in the home location register. The mobile subscriber exchange which has been set for a walking disabled person and has read the service class of the subscriber data has means for recognizing that the mobile station is a walking disabled person.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of a mobile communication system according to the present invention. As shown in FIG. 1, the mobile communication system includes a mobile station (S-MS) 1, which is a mobile phone carried by a disabled person, and a traffic signal base station (S-BTS) connected to the S-MS 1 by a radio line. 2)
A base station (BT) connected to this S-BTS2 via a wireless line
S) 3, a base station controller (BSC) 4 connected to the BTS 3 via a wired line, a mobile communication switch (MSC) 5 connected to the BSC 4 via a wired line, and an MSC 5
And public telephone network (PSTN) 10 connected by a wired line
And a traffic signal control unit (S
-CNT) 11, and S-MS1 and S-MS1.
The uplink radio channel frequency (control channel) between BTS2 is F1, the downlink radio channel frequency (control channel) between S-MS1 and S-BTS2 is f1, and the uplink radio channel frequency between S-BTS2 and BTS3. (Control channel) is F2, and the downlink radio channel frequency (control channel) between S-BTS2 and BTS3 is f2.

A mobile communication switching system (MSC) 5 controls an interface between a mobile switching center (MLS) 6 which controls overall call processing for mobile subscribers and a public telephone network (PSTN) 10 and a plurality of mobile communication switching systems (MSTNs). A mobile gateway relay exchange (MGS) 7 for controlling the mobile subscriber exchange, subscriber data such as mobile subscriber class and service information relating to the mobile subscriber, and location information of the mobile subscriber are stored. Home location register (HLR) 9 and N which controls various information transfer between the mobile subscriber exchange 6 and the mobile gateway exchange 7 and the home location register (HLR) 9.
O. 7 common line signal device (NO. 7 STP) 8.

FIG. 2 is a configuration block diagram of the traffic signal base station 2 shown in FIG. As shown in FIG. 2, the traffic signal base station 2 includes a mobile station antenna 20 that forms a radio channel with the mobile station 1 owned by the handicapped person, and a single antenna for transmitting and receiving operations with the mobile station. And a duplexer 22 for enabling the control to be performed by the mobile station, and an uplink control channel F1 from the mobile station.
And a receiving unit 23 for converting the received F1 into an uplink control channel F2 to the base station, and converting the downlink control channel f2 received from the base station to the downlink control channel f2 to the mobile station.
1, a transmission unit 25 that amplifies the uplink control channel F2 to the base station, which is an output of the frequency conversion unit 24, to a specified transmission power, and performs a transmission operation and a reception operation with the base station. A duplexer 26 for implementing with a single antenna, an antenna 21 for a base station constituting a radio line with the base station 3, a receiving unit 27 for receiving a downlink control channel f2 to the base station, A transmitting unit 28 that amplifies the downlink control channel f1 to the mobile station, which is an output of the frequency converting unit 24, to a specified transmission power; and a signal conversion and protocol for transmitting the signal setting signal received by the receiving unit 27 to the signal control unit. It comprises a traffic signal control unit interface 29 for performing control.

FIG. 3 is a block diagram showing the configuration of the traffic signal control section 11 shown in FIG. As shown in FIG. 3, the traffic light control unit 11 uses a pushbutton switch 30 for the visually impaired and an indicator light (signal) based on two input signals of the pushbutton switch signal and the traffic light setting signal from the traffic light base station. ) And a control circuit 31 for controlling the crossing guidance sound for the visually impaired, a switch circuit 32 for performing a switching operation of the indicator light (signal) and the crossing guidance sound for the visually impaired based on the output of the control circuit, and the switched display. It is composed of an indicator light driving circuit 33 that performs a lighting operation of a light (signal), a speaker driving circuit 34 that emits a switched crossing guidance sound for the visually impaired by a speaker, an indicator light (signal) 35, and a speaker 36. .

FIG. 4 is an installation image diagram showing an example in which the traffic light base station 2 shown in FIG. 2 and the traffic light control unit 11 shown in FIG. 3 are installed in the traffic light. As shown in FIG. 4, the antenna 21 for the base station is installed at the highest position of the traffic signal in order to ensure the wireless channel (F2, f2) with the base station 3, and the antenna for the mobile station is mounted on the road. In order to transmit and receive radio waves (F1, f1) only at the pedestrian crossing, antenna elements that are downward and have narrow directivity are selected and adjusted.

Here, it should be particularly noted that the radio wave radiated from the mobile station antenna is adjusted together with the adjustment of the directional characteristics of the mobile station antenna for making only the pedestrian crossing a service area. Adjustment of transmission power. The transmission output value is set to a transmission output as low as possible in order to eliminate interference with other communications, and to such a value that communication with a mobile station possessed by a handicapped person across the crosswalk can be established. In addition, in addition to the traffic signal body, the housing of the signal base station 2 and the signal controller 11 are shown in FIG.
Of the housing, the indicator light 35, the speaker 36, and the push button switch 30 for the visually impaired are shown.

FIG. 5 is an installation image diagram showing an example in which the form of the antenna for mobile stations shown in FIG. 4 is changed. As shown in FIG.
Consists of a plurality of planar antennas embedded on a pedestrian crossing, which applies to complex pedestrian crossings. Although the form of the antenna for mobile station is shown in the form of FIG. 4 or the form of FIG. 5, it is not limited to this, and when designing a traffic signal base station, the range of the service area can be accurately realized. For this purpose, the above antenna type or another antenna type is appropriately selected.

Next, the operation of the present invention will be described. First, the operation of the traffic signal base station shown in FIG. 2 will be described. Traffic light base station 2
Receives the downlink control channel f2 from the base station 3 at the receiving unit 27 via the antenna 21 for base stations and the duplexer 26, and uses the frequency converter 24 to transmit the downlink control channel f1 for signal base station f1. Convert to After the power of this f1 is amplified by the transmission unit 28, the radio wave is emitted near the pedestrian crossing via the duplexer 22 and the antenna 20 for the mobile station, thereby forming a signal base station service area.

The traffic signal base station 2 receives the uplink control channel F1 from the mobile station 1 in various control operations such as the outgoing connection operation and the location registration operation via the mobile station antenna 20 and the duplexer 22. This F1
Is converted to the base station uplink control channel F2 by the frequency conversion unit 24. Then, the power of the F2 is amplified by the transmission unit 25, and then the signal is notified to the base station 3 via the duplexer 26 and the antenna 21 for the base station, thereby configuring the signal base station service area.

Further, it is assumed that the following three conditions are set in advance on the mobile communication system side and the mobile station. In the setting at the time of construction of the traffic signal base station, the service area of the traffic signal base station (around the pedestrian crossing) is set to be a single location registration area for the traffic signal base station. The mobile subscriber exchange sets a service class according to each handicap in subscriber data of a home location register when a mobile phone (mobile station) owned by a disabled person is registered in advance in a mobile communication system. That is, in the service class for the visually impaired, when a registered subscriber crosses a road, a service for broadcasting a guidance sound for a disabled person in conjunction with a green signal at a pedestrian crossing is implemented. When a person crosses a road, a service is provided to ensure that the green light time of the pedestrian crossing is longer than usual. It is assumed that the mobile station owned by the disabled person is powered on and is performing a standby operation.

FIG. 6 is an overall operation sequence chart of the mobile communication system of the present invention. As shown in FIG.
When the mobile station 1 owned by the handicapped comes near a pedestrian crossing in order to cross a road, the mobile station 1 enters the service area of the traffic signal base station (step A1). The mobile station 1 entering the signal base station area has the downlink control channel changed from f2 to f2.
In response to the change to 1, a channel switching request signal is sent to the traffic signal base station 2 using the uplink control channel F1 (step B1). Since the traffic signal base station service area constitutes a single location registration area, the traffic signal base station 2 that has received the channel switching request signal determines that the location registration needs to be changed, and transmits to the base station 3 using the uplink control channel F2. A position registration request signal is sent (step B2). The base station 3 having received the location registration request signal sends a location registration signal including the subscriber number of the mobile station 1 and the location registration area number of the traffic signal base station 2 to the mobile subscriber exchange 6 (step B3).

Upon receiving the location registration signal, the mobile switching center 6 specifies the corresponding home location register 9 from the subscriber number of the mobile station 1, 7 The home location register 9 is remotely accessed via the common line signaling device 8 to change and register the location registration area number on the subscriber data of the mobile station 1 to the number of the traffic signal base station 2, and the home location register 9 Inquire about the service class on the subscriber data (step B4). The home location register 9 stores the signal base station area number in the location registration area on the subscriber data, reads the service class on the subscriber data (step A2), and stores the service class on the read subscriber data on the subscriber data. The data is returned to the mobile subscriber exchange 6 as a response signal to the data inquiry (step B5). This service class is provided with classes for the visually impaired and the walking disabled.

The mobile subscriber exchange 6 recognizes from the service class data and the signal base station area number that the disabled person has entered the signal area (step A3).
As a result, a signal setting command corresponding to the service class data is sent to the base station 3 together with the response signal for transmitting the position registration signal (step B6). The base station 3 that has received the signal setting command sends the signal setting signal to the signal base station 2 together with the position registration request response signal using the downlink control channel f2 on the wireless line (steps B7 and B8). The signal base station 2 that has received the signal setting signal receives the signal at the receiving unit 27, and the signal control unit interface 2
9 and transmitted to the traffic signal control unit 11. Traffic light controller 1
1 inputs a signal setting signal corresponding to the received service class to a control circuit 31 constituted by a timer, an indicator light control program and the like. In the case of a signal setting signal corresponding to the service class of the visually impaired, The speaker drive circuit 34 is operated via the switch circuit 32 to turn on the speaker at the same time as the operation of the indicator light switching to the green signal, and the visually impaired crossing guidance sound linked with the pedestrian crossing green signal is broadcast from the speaker 36. Control. In the case of a traffic light setting signal corresponding to a walking disabled person, the control circuit 3
1, the green light time of the pedestrian crossing is set to a time longer than the normal green light time, and the time signal is set to the switch circuit 32.
Control to extend the green light time of the pedestrian crossing.
Then, the traffic signal base station 2 sends a channel switching request response signal to the mobile station 1 using the downlink control channel f1, and ends the processing (step B9).

In the meantime, the broadcasting of the pedestrian crossing guidance sound and the pedestrian crossing green signal time extension operation are stopped at the same time as the green light of the pedestrian crossing changes to a red light after the disabled person crosses the road. If the crossing preparation is not completed and the disabled person stays near the pedestrian crossing, the broadcast of the visually impaired crossing guidance sound and the pedestrian crossing green signal time extension operation are continuously performed in conjunction with the green signal of the next pedestrian crossing.

FIG. 7 is an example of a memory layout diagram in the home location register of the present invention. As shown in FIG. 7, when accessing the subscriber data 42 in the home location register 40, the subscriber number 41 is indexed. Then, there is an area of the service class 43 in the subscriber data 42, and the disabled person class is registered in a specific bit in this area. In the example of FIG. 7, it is 1 for a visually impaired person and 2 for a walking disabled person. In addition, this number of disabled class and data numerical value is an example,
The number can be increased as needed.

[0027]

As described above, according to the present invention, a portable telephone (mobile) possessed by a handicapped person with a handicap in sight and walking can be used by utilizing a portable telephone which is currently spreading rapidly. Station) is registered in the mobile communication system at the time of registration, the service class corresponding to each handicap is set in advance in the subscriber data of the home location register of the mobile communication system, and that the handicapped arrives near the crosswalk on the road. Traffic signal control in a mobile communication system that can be operated at low cost and accurately by transmitting a traffic signal control signal corresponding to each handicap to the traffic signal from the mobile communication system. The method and the realization of traffic signal control system became possible.

[Brief description of the drawings]

FIG. 1 is an overall configuration block diagram of a mobile communication system according to the present invention.

FIG. 2 is a configuration block diagram of the traffic signal base station shown in FIG. 1 of the present invention.

FIG. 3 is a configuration block diagram of a traffic light control unit shown in FIG. 1 of the present invention.

4 is an installation state image diagram showing an example of a case where the traffic light base station shown in FIG. 2 of the present invention and the traffic light control unit shown in FIG. 3 are installed in the traffic light.

5 is an installation state image diagram showing an example of a case where the format of the antenna for mobile stations shown in FIG. 4 of the present invention is changed.

FIG. 6 is an overall operation sequence chart of the mobile communication system of the present invention.

FIG. 7 is an example of a memory layout diagram in a home location register of the present invention.

[Explanation of symbols]

 Reference Signs List 1 mobile station (S-MS) 2 traffic signal base station (S-BTS) 3 base station (BTS) 4 base station controller (BSC) 5 mobile communication switch (MSC) 6 mobile subscriber exchange (MLS) 7 mobile gateway relay Exchange (MGS) 8 NO. 7 Common line signaling device (NO.7 STP) 9 Home location register (HLR) 10 Public telephone network (PSTN) 11 Traffic signal control unit (S-CNT) 20 Antenna for mobile station 21 Antenna for base station 22, 26 Shared transmission and reception 23, 27 Receiver 24 Frequency converter 25, 28 Transmitter 29 Signal controller interface 30 Push button switch for visually impaired person 31 Control circuit 32 Switch circuit 33 Indicator light drive circuit 34 Speaker drive circuit 35 Indicator light (signal) 36 Speaker 40 Home location register 41 Subscriber number 42 Subscriber data 43 Service class

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04Q 7/38 H04B 7/26 109H

Claims (12)

[Claims] 1. A traffic signal control method for a pedestrian crossing on a road through which a person with a disability passes, a mobile station owned by the person with a disability, a traffic signal base station for providing a service area only near the pedestrian crossing, A mobile communication system connected by a line, a traffic signal controller connected to a traffic signal base station, and a traffic signal, wherein when the mobile station enters the service area of the traffic signal base station, the traffic signal base station is connected to the mobile communication system. Means for making a location registration request to the mobile communication system; means for receiving the location registration request to recognize that the mobile station is a disabled person; and Means for transmitting a traffic light setting signal to a control unit; and the traffic light control unit receives the traffic light setting signal and transmits a handy key to the traffic light. A traffic signal control system comprising means for supporting a disabled person according to a gap. 2. A traffic signal control system for a pedestrian crossing on a road through which a visually impaired person passes, a mobile station possessed by the visually impaired person, a traffic signal base station having a service area only near the pedestrian crossing, and a traffic light base station A mobile communication system including a base station, a mobile subscriber exchange, and a home location register connected to the base station, a mobile station, and a home location register; a traffic signal control unit connected to the traffic base station; Means for sending a channel switching request to the signal base station when the mobile station enters the service area of the signal base station;
Means for sending a location registration request to the mobile subscriber exchange via the base station in response to the channel switching request, the mobile subscriber exchange receiving the location registration request, and Means for recognizing that a visually impaired person and a visually impaired person carrying a mobile station have entered a pedestrian crossing area to cross a road, said mobile switching center comprising: Means for transmitting a signal setting signal to the signal control unit via the base station and the signal base station after recognizing that the signal control unit receives the signal setting signal and the speaker of the traffic signal. A traffic signal control system comprising means for broadcasting a guide sound for visually impaired persons in conjunction with a green light on a pedestrian crossing. 3. A traffic signal control method for a pedestrian crossing on a road through which a pedestrian passes, a mobile station possessed by the pedestrian, a traffic signal base station having a service area only near the pedestrian crossing, and a traffic light base station. A mobile communication system including a base station, a mobile subscriber exchange, and a home location register connected by a wireless line, a traffic signal control unit connected to a traffic signal base station, and a traffic signal capable of adjusting a green light time of a crosswalk. When the mobile station enters the service area of the traffic signal base station, the mobile station sends a channel switching request to the traffic signal base station, and the traffic signal base station receives the channel switching request and passes through the base station. Means for sending a location registration request to the mobile subscriber exchange, wherein the mobile subscriber exchange receives the location registration request and the mobile station is a walking disabled person. Means for recognizing that a walking impaired person carrying a mobile station has entered a pedestrian crossing area to cross a road; and Means for transmitting a traffic light setting signal to the traffic light control unit via the base station and the traffic light base station after the recognition, the traffic light control unit receives the traffic light setting signal, and A traffic signal control system comprising means for performing control for extending green light time. 4. The means for transmitting the location registration request sets in advance the setting of the service area of the traffic signal base station to be a single location registration area in the setting at the time of construction of the traffic signal base station, and therefore, sets a channel switching request signal. 4. The traffic signal control system according to claim 2, wherein the received signal base station sends a location registration request. 5. A means for recognizing that the mobile station is a visually impaired person, wherein when the mobile station owned by the visually impaired person is registered in advance in the mobile communication system, the service class of the subscriber data in the home location register is set. 3. The traffic according to claim 2, wherein the mobile subscriber exchange which has read the service class of the subscriber data recognizes that the mobile station is visually impaired. Signal control system. 6. A means for recognizing that the mobile station is a person with a walking disability, the service class of the subscriber data in the home location register when registering the mobile station possessed by the person with a walking disability in advance in a mobile communication system. 4. The traffic according to claim 3, wherein the mobile subscriber exchange which has read the service class of the subscriber data recognizes that the mobile station is a walking disabled person. Signal control system. 7. A traffic signal control method for a pedestrian crossing on a road through which a person with a disability passes, a mobile station owned by the person with a disability, a traffic signal base station that sets only the vicinity of the pedestrian crossing as a service area, a traffic signal base station, and a radio A mobile communication system connected by a line, a traffic signal controller connected to a traffic signal base station, and a traffic signal, wherein when the mobile station enters the service area of the traffic signal base station, the traffic signal base station is connected to the mobile communication system. The mobile communication system receives the position registration request, recognizes that the mobile station is a disabled person, and after recognizing the disabled person, the mobile communication system The traffic signal control unit transmits the traffic signal setting signal, and the traffic signal control unit receives the traffic signal setting signal, and sends the traffic signal to the disabled person according to the respective handicap. A traffic signal control method comprising performing a port. 8. A traffic signal control method for a pedestrian crossing on a road through which a visually impaired person passes, a mobile station possessed by the visually impaired person, a traffic signal base station having a service area only near the pedestrian crossing, and a traffic light base station A mobile communication system including a base station, a mobile subscriber exchange, and a home location register connected to the base station, a mobile station, and a home location register; a traffic signal control unit connected to the traffic base station; When the mobile station enters the service area of the traffic signal base station, the mobile station sends a channel switching request to the traffic signal base station, and the traffic signal base station receives the channel switching request and passes through the base station. And sends a location registration request to the mobile subscriber exchange. The mobile subscriber exchange receives the location registration request and And that the visually impaired person carrying the mobile station has entered the pedestrian crossing area to cross the road, the mobile switching center recognizes that the visually impaired person is going to cross the road. After that, a traffic light setting signal is sent to the traffic light control unit via the base station and the traffic light base station, and the traffic light control unit receives the traffic light setting signal and sends a blue signal of the pedestrian crossing to the speaker of the traffic light. A traffic signal control method, characterized in that a guide sound for visually impaired persons is broadcast in conjunction with the traffic signal. 9. A traffic signal control method for a pedestrian crossing on a road through which a person with a pedestrian crosses, a mobile station possessed by the person with a pedestrian, a traffic signal base station having a service area only near the pedestrian crossing, and a traffic signal base station A mobile communication system including a base station, a mobile subscriber exchange, and a home location register connected by a wireless line, a traffic signal control unit connected to a traffic signal base station, and a traffic signal capable of adjusting a green light time of a crosswalk. When the mobile station enters the service area of the traffic signal base station, the mobile station sends a channel switching request to the traffic signal base station, and the traffic signal base station receives the channel switching request and performs the mobile operation via the base station. A location registration request is sent to the local exchange, and the mobile local exchange receives the location registration request and determines that the mobile station is a walking disabled person. The mobile subscriber exchange recognizes that the walking impaired person carrying the mobile station has entered the pedestrian crossing area to cross the road, and the mobile subscriber exchange recognizes that the walking disabled person attempts to cross the road. A traffic light setting signal is transmitted to the traffic light control unit via the base station and the traffic light base station, and the traffic light control unit receives the traffic light setting signal and controls the traffic light to extend the green light time of the crosswalk. Traffic signal control method. 10. The transmission of the location registration request is performed by setting a service area of the traffic signal base station to be a single location registration area in advance at the time of construction at the time of construction of the traffic signal base station. 10. The traffic signal control method according to claim 8, wherein the received traffic signal base station sends a location registration request. 11. Recognizing that the mobile station is a visually impaired person, when registering a mobile station owned by the visually impaired person in a mobile communication system in advance, the service class of the subscriber data in the home location register. 9. The traffic according to claim 8, wherein the mobile subscriber exchange which has read the service class of the subscriber data recognizes that the mobile station is visually impaired. Signal control method. 12. Recognizing that the mobile station is a person with a walking disability, when the mobile station possessed by the person with a walking disability is registered in advance in a mobile communication system, the service class of the subscriber data in the home location register. 10. The traffic according to claim 9, wherein the mobile station exchange is configured to read the service class of the subscriber data to recognize that the mobile station is a walking disabled person. Signal control method.