JPH1169432A - Mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a scale, to perform communication with another mobile equipment even at a place where the communication can not be performed with a base station or to perform the communication with the base station through the other mobile equipment. SOLUTION: For the mobile equipment, a transmission circuit for transmitting signals at a frequency fdm for an outgoing channel is added to a normal transmission/ reception circuit for the frequency fdb for outgoing channel reception and the frequency fu for incoming channel transmission with the base station, the reception signals of the frequency fdm are shared by the circuit for the outgoing channel reception and the transmission and reception of the frequency fdm for the outgoing channel are switched by a switch 3 by the control of a control part 7. A transmission/reception part is shared as much as possible, a constitution scale is reduced, portability and cost-efficiency are given priority and an emergency code is set and is validated when emergency communication is required. A storage part 9 stores prescribed data including a message, a response is made to the received signal, the message is repeatedly sent out to a destination and the certainty of communication realization is increased. Also, the switch 3 is switched by operation input to the control part 7 and use is performed as a transceiver.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system in which communications are performed using radio waves for downlink channels transmitted from a base station to a mobile station and radio waves for uplink channels transmitted from a mobile station to a base station. In particular, the present invention relates to a mobile communication system that enables a minimum communication with a minimum addition of a function even in a place where radio waves are difficult to reach between a mobile device and a base station, a place outside a service area, and the like.

[0002]

2. Description of the Related Art Conventionally, in this type of mobile communication system, as described in, for example, Japanese Patent Application Laid-Open No. Hei 5-344037, the mobile communication system is preferably used in places where radio waves cannot directly reach from a base station, such as a building or an underground shopping mall. There are portable wireless telephones that allow calls.

[0003] As shown in FIG.
It has two sets of radio wave transmitting / receiving units for base station communication and relay communication.

That is, for base station communication, the antenna 1
1, a duplexer 102, a high-frequency amplification circuit 103, a mixing circuit 104, a demodulation circuit 105, a data / audio processing circuit 106, a modulation circuit 107, a high-frequency amplification circuit 108, a power amplification circuit 109, and a local oscillation circuit 110. For relay communication, the antenna 111, the duplexer 112, the high-frequency amplifier 113, and the reception mixer 11 share the demodulation circuit 105, the data / voice processing circuit 106, the modulation circuit 107, and the local oscillation circuit 110.
4. Mixing circuit for transmission 118 and power amplification circuit 109
Is provided. The telephone function includes a speaker 121
And a microphone 122 are shown.

The radio wave transmitted and received by the antenna 101 for base station communication has a frequency fd in a downlink channel from the base station and a frequency fu in an uplink channel to the base station.
Also, the relay reception frequency ft1 and the relay transmission frequency ft2
It is.

When the mobile station normally communicates with the base station, the signal of the radio wave of the frequency fd received by the antenna 101 is amplified by the high-frequency amplifier 103 through the duplexer 102, and locally amplified by the mixing circuit 104. Oscillation circuit 1
It is mixed with 10 signals and converted into a predetermined intermediate frequency. Next, this signal is converted into a signal in the audio band by the demodulation circuit 105 and is output from the speaker 121 as audio.

On the other hand, the uttered sound is converted into an electric signal by the microphone 122, processed into an appropriate band / level by the data / voice processing circuit 106, and then converted into the transmission frequency fu by the modulation circuit 107. The converted modulated signal is amplified to an appropriate power by a transmission high-frequency amplifier circuit 108 and a power amplifier circuit 109, and then transmitted to the base station via the duplexer 102 and the antenna 101.

When the mobile station becomes a relay mobile station that relays communication, the relay mobile station first sets a reception frequency ft1 and a transmission frequency ft2 for relay communication with a mobile station of a communication partner before starting communication. Set. The radio wave signal transmitted from the base station has a frequency fd, is amplified by the high frequency amplifier 103 from the antenna 101 via the duplexer 102, and is transmitted to the transmission mixing circuit 118. The signal is mixed with the signal of the local oscillation circuit 110 by the transmission mixing circuit 118, converted into the relay transmission frequency ft2, and transmitted to the partner mobile station via the power amplifier 119, the duplexer 112, and the antenna 111. You.

On the other hand, a signal from a mobile station during a call, which is a communication partner, is received by an antenna 111 by radio waves of a frequency ft 1, and is transmitted through a duplexer 112 to a high-frequency amplifier 113.
The local oscillation circuit 11 is amplified by the reception mixing circuit 114.
The signal of 0 is converted into a signal of frequency fu. The converted signal is amplified to an appropriate power by the high-frequency amplifier circuit 108 and the power amplifier circuit 109, and then transmitted to the base station via the duplexer 102 and the antenna 101.

[0010] Further, the mobile unit during a call, when starting communication,
The relay communication antenna 111 of FIG. 10 is set to receive the radio wave of the frequency ft2 and transmit the radio wave of the frequency ft1. The signal received by the antenna 111 by the radio wave of the frequency ft2 is amplified by the high frequency amplifier 113, mixed by the reception mixing circuit 114 with the signal of the local oscillation circuit 110, and converted into a predetermined intermediate frequency. This converted signal is supplied to the demodulation circuit 105
Is converted into a signal in the audio band, and the audio is output from the speaker 121.

On the other hand, the voice input from the microphone 122 and converted into an electric signal is transmitted to the data / voice processing circuit 10.
After being processed to an appropriate band / level by the modulation circuit 6, the modulation circuit 10
At 7, the signal is converted to the transmission frequency FU to the base station, and further mixed at the transmission mixing circuit 118 with the signal of the local oscillation circuit 110 to be converted to the transmission frequency ft1 to the relay mobile station. This converted signal is amplified to an appropriate power by the power amplifier circuit 119, and then transmitted to the relay mobile device via the duplexer 112 and the antenna 111.

[0012]

The above conventional mobile communication system has the following problems.

First, the first problem is that the scale of the apparatus is large, so that portability is inferior and manufacturing cost is high.

The reason is that the circuit configuration has two sets, one for base station communication and one for relay communication, which is almost twice as large as a state without a relay function.

The second problem is that handling is complicated.

[0016] The reason is that when going to a place where radio waves are difficult to reach, it is necessary to carry two mobile units for calling and relaying, and the installation location of the relaying mobile unit is far away or invisible. This is because if the phone is stolen at a location, the call is hindered, and it is difficult to determine the installation location.

An object of the present invention is to solve the above-mentioned problems, to minimize the size of the scale, and to perform another mobile operation even in a place where communication with a base station is not possible when urgent communication is required. An object of the present invention is to provide a mobile communication system that can communicate with a destination via the mobile device if the mobile device can communicate with the mobile device.

[0018]

The basic structure of the mobile communication system according to the present invention is that a radio wave for a downlink channel transmitted from a base station to a mobile station and a radio wave for an uplink channel transmitted from the mobile station to the base station are respectively provided. In the mobile communication system for performing communication using the communication device, the mobile device includes a transmission / reception unit that performs communication between the mobile devices using the downlink radio wave.

Therefore, the frequency range of the radio wave handled by the mobile device is two for each of the uplink channel and the downlink channel, and the transmission / reception circuit can be shared.

Further, the mobile station has an emergency mode selection means set in an emergency, an emergency message, an emergency code for identifying the emergency message, and an emergency signal transmitted / received to / from another mobile station in the emergency. Storage means for storing a predetermined portion of the emergency message, and when the emergency mode is set by the emergency mode selection means, the emergency signal is created by synthesizing the emergency signal with the control signal including the emergency message, the emergency code, and the self identification code. And, when the emergency transmission means for transmitting by the downlink channel radio wave and the emergency code is identified from the signal received from another mobile station by the downlink channel radio wave, the received signal is determined as an emergency signal, and the predetermined information is determined. Emergency signal transfer means for storing in the storage means, creating a predetermined emergency signal, and transmitting the generated emergency signal to the base station by radio waves of uplink channels.

With this configuration, even if an emergency situation occurs and normal communication cannot be directly performed via the base station, if communication with another mobile station that can communicate with the base station is possible, the emergency The signal can be sent by a one-way communication method.

Further, the mobile station includes a switch for switching and selecting the transmission and reception of the radio wave of the downlink channel to only one of transmission and reception.

Therefore, communication similar to that of a transceiver, in which transmission and reception are alternately performed by switching control between mobile units, can be performed.

[0024]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a functional block diagram showing an embodiment of a mobile device according to the present invention.

As shown in FIG. 1, in this mobile device,
One antenna 1 for transmission / reception, a duplexer 2 for frequency division of transmission / reception radio waves, a switch 3 for transmission / reception switching at a frequency fd of radio waves used for a downlink channel from the base station to the mobile station, and a receiving unit for the frequency fd. High frequency amplifier 4, mixing circuit 5, demodulation circuit 6, control unit 7 common to transmission / reception units, local oscillation circuit 8, storage unit 9, telephone circuit 10, and frequency fu of radio waves used for uplink channels to base stations. A modulation circuit 11, a high-frequency amplification circuit 12, a power amplification circuit 13, and a frequency f
It is assumed that a modulation circuit 21, a high-frequency amplification circuit 22, and a power amplification circuit 23, which serve as a transmission unit of d, are provided.

The control unit 7 has an emergency signal transmission function, an emergency code identification function, and a message output function. The storage unit 9 has an area for storing an emergency message and an emergency code. By switching the switch 3 and controlling the local oscillation circuit 8, the antenna 1
It is assumed that the frequency of the radio wave transmitted and received by is set.

Here, the frequency fd of the radio wave used for the downlink channel from the base station to the mobile station is defined as a frequency fdb for distinguishing it from the frequency used between the mobile stations, and the radio wave used between the mobile stations is It is assumed that the frequency is fdm. Therefore, it is assumed that the transmission frequency fu and the reception frequency fdb are used between the mobile station and the base station, and the same frequency fdm is used for transmission and reception between the mobile stations.

Next, the frequency used will be described with reference to FIG. The base station 3B having the service area 3A transmits a radio wave of the frequency fdb for the downlink channel to each mobile station 3Mx and receives a radio wave of the frequency fu for the uplink channel.
The mobile station 3Mx according to the present invention transmits radio waves of the frequency fu for the uplink channel to the base station 3B and receives radio waves of the frequency fdb for the downlink channel, while transmitting radio waves of the frequency fdm for the downlink channel that can be received by the mobile station. Send and receive.

As shown in the figure, when the mobile station 3M1 cannot communicate with the base station in any service area by the radio wave of the frequency fu of the uplink channel, the frequency f
Try communication with other mobile station 3Mx using dm radio wave. Mobile device 3M1
However, when the mobile station 3M2 can communicate with the mobile station 3N2 in the service area 3A of the base station 3B, the mobile station 3M2 requests a call connection to the mobile station 3M2. Can be determined, the call is transmitted to the base station 3B
The connection from the mobile station 3M1 can be connected to the destination by relay connection to the destination.

This connection is reliably connected to the destination, and the message can be transmitted. However, since the relaying mobile unit 3M2 is requested to make a connection irrelevant to itself, the message must be relayed and transmitted in a short time. is there. Therefore,
Such a system is effective for transmitting an emergency signal when urgent communication is desired from a place where radio waves do not reach the base station.

Next, the transmission of the emergency signal will be described with reference to FIG. 3 and FIG.

For example, a person who was distressed in the mountains
When the base station 3B is called when communication is attempted using M1, but communication is not possible outside the service area, the mobile station 3M1 is set to transmit an emergency signal and the same as when the mobile station 3Mx receives from the base station Frequency f due to radio wave for downlink channel
Emergency signal including emergency code is transmitted by dm.

The mobile station 3M2 that can receive the emergency signal and can communicate with the base station 3B identifies the emergency code from the received signal and determines the emergency signal. The signal is transmitted at the frequency fu of the normal uplink channel radio wave that can be received and restored. Base station 3B
Then, the emergency signal is identified from the received signal, the emergency signal is determined, and the emergency signal is transferred to the destination included in the emergency signal, whereby the emergency signal transmitted by the mobile device 3M1 can be delivered to the destination.

A variety of functions can be exhibited by adding, to the emergency signal, an identification code other than the emergency code, such as a source mobile station and a relay mobile station, and other necessary information.

Next, the normal operation of the mobile station will be described with reference to FIG. 1 and FIG.

Normally, the switch 3 of the mobile unit 3M2 is connected to the receiving side of the transmission / reception frequency fd for the downlink channel under the control of the control unit 7, and the base station 3B received by the antenna 1
The signal at the frequency fdb in the downstream channel from the transmitter is amplified by the high-frequency amplifier circuit 4 via the duplexer 2 and the switch 3 and mixed with the signal of the local oscillation circuit 8 by the mixing circuit 5 to be converted into a predetermined intermediate frequency. Next, the converted signal is converted into a signal in the audio band by the demodulation circuit 6,
The data is sent to the telephone circuit 10 via the control unit 7 and output as voice.

On the other hand, the call voice is converted into an electric signal by the telephone circuit 10 and, after the necessary data is added by the control unit 7, is sent to the modulation circuit 11 for the upstream channel, and is transmitted to the base station 3.
It is converted to the frequency fu in the upstream channel to B.
The modulated signal modulated by the modulation circuit 11 is amplified by the high-frequency amplifier circuit 12 and the power amplifier circuit 13 to an appropriate power, and then transmitted through the duplexer 2 and the antenna 1 to be received by the base station 3B.

In the source mobile unit 3M1 for transmitting the emergency signal, when transmitting the emergency signal, an operation for transmitting the emergency signal is input to the control unit 7 of the mobile unit 3M1, and the control unit 7 controls the switch 3 to control the frequency. The connection of fd to the duplexer 2 is switched from the receiving side to the transmitting side.

The voice emergency message is converted to an electric signal by the telephone circuit 10 and sent to the control unit 7, where the control unit 7 converts the data required for transmitting the emergency signal into a predetermined electric signal and the self-mobile unit 3M1. , An emergency code for an emergency signal, and a signal such as a signal to end the input of an emergency message by a switch, are formed into an emergency signal, and the modulation circuit 21 is formed by an emergency signal transmission function.
Sent to

The emergency signal is converted to the frequency fdm of the radio wave for the down channel by the modulation circuit 21 and amplified to an appropriate power by the high frequency amplifier circuit 22 and the power amplifier circuit 23, and then the switch 3, the duplexer 2 and the antenna 1 to another mobile unit 3M2. Thereafter, the control unit 7 returns the switch 3 to the side receiving the frequency fdb or the frequency fdm, and waits for a signal of the frequency fd.

Next, the originating mobile unit 3M1
Then, an emergency signal acceptance notification signal is received at the frequency fdm from the relay mobile station 3M2 that has received the transmitted emergency signal. The emergency signal acceptance notification signal is sent to the high-frequency amplifier circuit 4 and the mixing circuit 5 via the duplexer 2 and the switch 3, where the signal is mixed with the signal of the local oscillation circuit 8 and converted to a predetermined intermediate frequency. Next, the converted signal is converted into a signal in the audio band by the demodulation circuit 6, the received signal is decoded by the control unit 7, and an "emergency signal acceptance notification" is displayed.

In the relay mobile station 3M2 which receives and relays the emergency signal from the source mobile station 3M1, the switch 3 is on the side receiving the frequency fd, and waits for a downlink channel signal from the base station 3B.

The emergency signal with the frequency fdm received from the source mobile unit 3M1 is amplified from the antenna 1 via the duplexer 2 and the switch 3 by the high-frequency amplifier 4 and mixed with the signal of the local oscillator 8 by the mixer 5. It is converted to a predetermined intermediate frequency. Next, the converted signal is supplied to the demodulation circuit 6
The emergency code identifying function of the control unit 7 identifies the emergency code from the received signal and decodes the signal as an emergency signal.

Next, the control unit 7 stores predetermined data such as an emergency message and an emergency code in the storage unit 9 and adds an emergency signal obtained by adding its own mobile station identification code to the emergency signal received by the emergency signal transmission function. The signal is sent to the modulation circuit 11 for the uplink channel. The modulation circuit 11 transmits the received signal to the base station 3
To the frequency fu in the upstream channel to B. The modulation signal modulated by the modulation circuit 11 is transmitted to the high-frequency amplification circuit 1
2 and the power amplifying circuit 13 to amplify the power to an appropriate level, and then transmitted via the duplexer 2 and the antenna 1 to be received by the base station 3B. The base station 3B transfers the received signal to a destination.

Next, an operation procedure of transmitting and relaying an emergency signal in the control unit 7 of the mobile station will be described with reference to FIGS.

FIG. 4A shows the procedure of the control unit 7 in the source mobile station 3M1 for transmitting an emergency signal.

First, when transmitting an emergency signal, the mobile station 3
Since an operation for transmitting an emergency signal is input to the control unit 7 of M1 (step S11), the control unit 7 controls the switch 3 to switch the duplexer 2 from the receiving side of the frequency fdb to the transmitting side of the frequency fdm.
Switch connection.

Next, the voice emergency message is converted into an electric signal by the telephone circuit 10 and sent to the control unit 7, and the control unit 7 converts the data necessary for transmitting the emergency signal into a predetermined electric signal, Predetermined data such as an identification code of the machine, an emergency code for an emergency signal, and a signal to end input of an emergency message by a switch are added to the data, formed into an emergency signal, and sent to the modulation circuit 21.

This emergency signal is converted by the modulation circuit 21 into the frequency fdm of the radio wave for the downlink channel, and is converted to another mobile station 3Mx.
(Step S12), the switch 3 is returned to the side receiving the frequency fdb or the frequency fdm under the control of the control unit 7, and waits for a signal of the frequency fd (Step S1).
3).

Next, the originating mobile unit 3M1
Then, an emergency signal acceptance notification signal is received at the frequency fdm from the relay mobile station 3M2 having received the transmitted emergency signal, and the received signal is sent to the control unit 7. The control unit 7 identifies the emergency signal reception notification signal, stores the predetermined data in the storage unit 9, displays the reception of the emergency signal reception notification signal on a liquid crystal or the like (step S14), and outputs the signal of the frequency fd. (Step S10).

On the other hand, in the relay mobile station 3M2, the switch 3 is in the receiving state of the frequency fd for the downlink channel (procedure S
20). When a signal is received at the frequency fdm from the mobile station 3M1 of the emergency signal in step S12 (step S2).
1) The control unit 7 identifies the emergency code to determine the emergency signal, stores predetermined data in the storage unit 9, and displays that the emergency signal has been received (step S22).

Next, the control unit 7 switches the switch 3 from the receiving side to the transmitting side, creates a predetermined emergency signal acceptance notification signal as a response notification having received the emergency signal, and downloads the destination mobile station 3M1 as the destination. The signal is transmitted to the modulation circuit 21 for the channel and transmitted at the frequency fdm (step S23).

The control unit 7 determines that the destination of the emergency signal received in step S21 is its own mobile unit 3M2 (Y in step S24).
ES), the switch 3 is switched from the transmitting side to the receiving side, not only that the emergency signal has been received, but also the emergency message included in the emergency signal is displayed (step S25), and the above step S10 is performed.
To return to the normal state of waiting for the signal of the frequency fd.

If the above step S24 is "NO" and the destination of the received emergency signal is not the self-mobile unit 3M2, the control unit 7
An emergency signal to which the own mobile station identification code is added is created as the relay mobile station 3M2, a procedure for transmitting an emergency signal to the communicable base station 3B is performed (procedure S26), and the switch 3 is switched to the receiving side. Wait for a response signal from the base station 3B. That is, the control section 7 sends the emergency signal to be transmitted to the modulation circuit 11 for the uplink channel and sends it to the base station 3B at the frequency fu (step S27).

When the base station 3B determines that the received signal is an emergency signal, the base station 3B sends a predetermined emergency signal acceptance notification signal to the relay mobile station 3M2. The control unit 7 receives and receives the emergency signal reception notification signal from the station 3B, and displays the reception of the emergency signal reception notification signal from the base station 3B (step S28).

Next, the control unit 7 switches the switch 3 to the transmitting side, and transmits the emergency signal acceptance notification signal received from the base station 3B to the source mobile station 3M1 at the frequency fdm (step S29). Next, the control unit 7 sets the switch 3
Is switched to the receiving side, and the process proceeds to step S10, where the frequency fd
It returns to the normal state waiting for the signal.

As described above, in the relay mobile station, after transmitting the emergency signal to the base station, the emergency signal reception notification signal is transmitted to the transmission source mobile station. Upon receiving the emergency signal reception notification signal, the mobile device indicates that "the emergency signal has reached the relaying mobile device". At this time, when the relay signal is provided to the base station in addition to the reception notification signal and a relay code is added to the base station, the relay code is included in the emergency signal reception notification signal returned from the base station as a response. On the other hand, the source mobile device can detect the relay code from the received emergency signal acceptance notification signal and display that "the emergency signal has arrived at the base station".

Next, the operation procedure of transmitting and relaying a communication check signal in the control unit 7 of the mobile station will be described with reference to FIG. 5 and FIGS. This feature
Before the mobile station 3M1 issues an emergency signal, the base station 3B
Mobile station 3 capable of communicating with the terminal and capable of relaying an emergency signal
This is to confirm in advance that M2 exists.

First, upon receiving a predetermined operation input for investigating the possibility of transmitting an emergency signal (step S41), the control unit 7 of the mobile device 3M1 switches the switch 3 to the transmission side to set the transmission mode, and A predetermined communication check signal including the mobile station identification code is generated and transmitted to all downlink channels at the frequency fdm (step S42). Next, the controller 7 switches the switch 3 to the reception mode, and enters a normal state of waiting for a signal at the frequency fd of the downlink channel (step S43).

In this state, when the control unit 7 receives a communication enable signal having its own mobile station code at the frequency fdm,
Along with storing the predetermined data of the received signal, a display "indicating that the signal has reached a mobile station capable of communicating with and relaying with the base station" is displayed (step S44). Next, the control unit 7
In step S43, the connection of the switch 3 is left as it is.
And returns to a normal signal waiting state at the frequency fd of the downlink channel, receives a communication enable signal from another relayable mobile station 3M2, and sequentially stores and displays data of the communication enable signal.

Based on this display, the sender can be assured that the emergency signal will surely reach the destination, and then use the identification code of the relayable mobile unit 3M2 that is the source of the received communicable signal. And a reliable emergency signal transmission can be performed.

On the other hand, the relay mobile unit 3m2 waits for a signal of the frequency fd in a normal state (step S50). Since the communication check signal with the frequency fdm transmitted from the mobile device 3m1 in the above step S42 is input from the antenna 1 and accepted by the control unit 7 (step S51), predetermined data of the communication check signal is stored in the storage unit 9. (Step S5
2).

Next, the control unit 7 checks whether communication with the base station 3B is possible or not according to a normal procedure (procedure S53). If communication is possible (procedure S54), the control unit 7 switches the switch 3 to the transmission side and checks the received communication. A predetermined communicable signal to which the own mobile station identification code is added is transmitted to the source mobile station 3M1 at the frequency fdm (step S55).

Next, the control unit 7 switches the switch 3 to the receiving side to enter a normal state of waiting for a signal at the frequency fd of the downlink channel (step S40).

Next, a procedure for inputting a voice message of a predetermined length or less when the mobile station 3m1 transmits an emergency signal will be described with reference to FIG. 6, FIG. 1, FIG. 3 and FIG. The function is to include a storable voice message in the emergency signal and to play the stored voice message. Therefore, it is assumed that the storage unit 9 can write and read a voice message within the predetermined length.

First, when receiving an operation of inputting a voice message (procedure S61), the control unit 7 of the mobile unit 3m1, which sends an emergency signal by voice message, switches the switch 3 to the transmitting side, and the telephone circuit 10 outputs voice. It is converted into an electric signal and temporarily written into the storage unit 9 to confirm that the voice message is within a predetermined length (step S62). Based on this confirmation, the control unit 7 creates an emergency signal including the voice message read from the storage unit 9, data necessary for emergency transmission, its own mobile device identification code, an emergency code, and the like, and switches the switch 3. Switch to the transmitting side and convert this emergency signal to frequency f
It is transmitted by dm (procedure S63). Next, the control unit 7
Switches the switch 3 to the receiving side, and returns to the normal state of waiting for the signal of the frequency fd, following the procedure S13 in FIG.

On the other hand, in the mobile station 3m2 which relays the emergency signal by the voice message, when receiving the emergency signal of the frequency fdm in the above-mentioned step S63 (step S65), the control unit 7 identifies the emergency signal and transmits the voice message. The predetermined data including the voice message is detected and stored in the storage unit 9 (step S66), and "voice message present" is displayed (step S6).
7). Next, the control unit 7 switches the switch 3 to the transmitting side, and continues to the above-described step S23 in FIG. 4 in which the emergency signal acceptance notification signal is transmitted at the frequency fdm.

By the display of "voice message present", the owner of the mobile device can call the voice message stored by the caller and the predetermined operation.

According to this configuration, the emergency signal length can be kept short, so that an increase in traffic given to normal communication is reduced. In addition, the relayed mobile station can repeatedly transmit the emergency signal until the destination can be notified by communication with the base station by using the fact that the message is stored.

Next, referring to FIG. 7, FIG. 3, FIG. 3 and FIG. 4, a procedure including a reply message in a reception notification signal returned when an emergency signal is received from the mobile station 3M2 or the base station 3B will be described. explain. In this function, it is assumed that a reply message and a relay code are prepared.

As described above, the emergency signal is transmitted from the source mobile station 3
When the packet is transferred from m1 to the destination via the relay mobile device 3M2, the relay code is added to the emergency signal in the relay mobile device 3M2. When a reply message is included in the emergency signal acceptance notification signal returned from the destination in response to the emergency signal, procedure S14 (source mobile station 3m1) and procedure S14 in FIG.
28 (relay mobile device 3m2), when control unit 7 detects a reply message (procedure S82) upon receiving the emergency signal acceptance notification signal (procedure S81), it stores predetermined data including the reply message in storage unit 9; And displays "reply message present" indicating that the reply message has arrived. Based on this display, the owner of the mobile device reads out the reply message from the storage unit 9 by a predetermined operation, and receives the reply message by voice from the telephone circuit 10 when the reply message is voice.

Next, referring to FIG. 8 and FIGS. 1 and 3, a description will be given of the communication in the transceiver mode in which the mobile station 3M1 calls the mobile station 3M2 and the transmission / reception operation is switched between them.

First, as shown in FIG. 8A, when the control unit 7 of the mobile unit 3M1 receives a transmission operation input in the transceiver mode together with the identification code of the mobile unit 3m2 of the communication partner (step S91), The switch 3 is switched to the transmission side to set the transmission mode (step S92). Next, the control unit 7
Adds a transceiver mode identification code, an identification code of its own mobile unit 3M1, a transmission channel to be used and a reception channel to the identification code of the mobile unit 3M2, and forms a transmission channel by the transmission frequency fdm. The voice message received from the telephone circuit 10 is sent to the mobile station 3M2 of the communication partner (step S93).

Next, the control unit 7 receives the cancellation of the transmission mode operation (step S94), so that the switch 3 is switched to the receiving side to set the reception mode (step S95), and the signal from the mobile station 3M2 by the frequency fdm is set. (Procedure 96).

On the other hand, as shown in FIG. 8B, the mobile station 3M2 to which the destination is specified is in a normal state of waiting for a signal of the frequency fd (step S100). The transmitted signal and voice message can be received at the frequency fdm (procedure S101). The control unit 7 detects the reception in the transceiver mode from the received signal, stores it in the storage unit 9 together with the predetermined data, and displays "transceiver mode" (step S102).

The control unit 7 receives a transmission operation input based on the display (step S103), and switches the switch 3 to the transmission side to set the transmission mode (step S104). Next, in the same manner as in step S93, the control unit 7 sets the transceiver mode identification code to the identification code of the mobile device 3M1,
Information such as an identification code of the own mobile unit 3M2, a transmission channel and a reception channel to be used is added, and the transmission frequency f
A transmission channel is formed by dm, and a voice message received from the telephone circuit 10 is transmitted to the mobile device 3M1 of the communication partner (step S105).

Control unit 7 receives the cancellation of the transmission mode operation upon completion of the transmission of the voice message (step S106).
Therefore, the switch 3 is switched to the receiving side, the receiving mode is set (step S107), and the mobile station 3M1 using the frequency fdm is set.
Waits for a signal from (step 108).

On the other hand, the control unit 7 of the mobile unit 3M1 waits for a signal in the above step S96, and the frequency fdm transmitted from the mobile unit 3M2 to the mobile unit 3M1 in the above step S105.
(Step S97).
The control unit 7 continues the reception mode for receiving the signal of the frequency fdm (step S98).

Although illustration is omitted, until the transceiver mode is canceled, one of the mobile units 3M1 and 3M2 is set to the transmission mode as described above by inputting a transmission operation, and the message is transmitted to the other party. Can be sent to mobile devices.

When the transceiver mode is set by a plurality of mobile stations, it is possible to individually communicate with a plurality of mobile stations by designating a destination of a communication partner, and it is also possible to perform broadcast communication with a plurality of mobile stations. .

Next, another embodiment different from FIG. 1 will be described with reference to FIG.

As shown in the figure, this mobile station uses an antenna 1, a duplexer 2, a switch 30, a control unit 70, a local oscillation circuit 80, a storage unit 90, and a telephone circuit 10 in common, and a signal receiving unit. The high-frequency amplification circuit 4, the mixing circuit 5, and the demodulation circuit 6 are provided, and the modulation circuit 31, the high-frequency amplification circuit 32, and the power amplification circuit 33
, Respectively.

The difference from FIG. 1 is that a set of a shared modulation circuit 31 and a high-frequency amplification circuit 32 are provided for each of the uplink channel transmission frequency fu to the base station and the downlink channel transmission frequency fdm between the mobile stations. And a power amplification circuit 33.

The switch 30 switches the transmission and reception of the downlink channel radio signal to connect to the duplexer 2 and, when transmitting the downlink channel radio signal for communication with the mobile station, transmits the uplink channel radio signal. The connection with the duplexer 2 is to be disconnected.

The control section 70 controls the local oscillation circuit 80 in accordance with the transmission and reception of signals, and the control procedure is the same as that described above with reference to FIG.

In this embodiment, one set of the modulation circuit, the high-frequency amplifier circuit and the power amplifier circuit is eliminated as compared with FIG. 1, so that in addition to the effects described above,
The circuit scale is further reduced.

As described above, the minimum function is added to the mobile station having only the communication with the base station so that the communication between the mobile station and the mobile station which can communicate with the base station can be performed even in a place where the mobile station cannot communicate with the base station. Can communicate with the destination at a minimum.

In the above description, the display is simply made. However, a visual display using characters such as a lamp or a liquid crystal and a display combining audible sound or vibration indicating that there is a visible display are appropriate. Good.

[0090]

As described above, according to the present invention, the following effects can be obtained.

The first effect is that, even in a place where radio waves do not reach from the base station, if communication is possible with a mobile station that can communicate with the base station, only an emergency signal can be transmitted to the destination.

The reason is that the mobile station is provided with a transmitting section for transmitting radio waves of the frequency of the downlink channel that can be received by the mobile station itself. Is relayed to the base station.

The second effect is that, despite the above effects, portability is improved and costs can be reduced.

The reason is that most of the transmission / reception functions added to the normal communication functions are shared by the conventional circuit.

The third effect is that even if it is impossible to communicate directly with the base station, the possibility of communication is confirmed and the emergency signal is reliably delivered to the destination.

The reason is that, by providing a communication check signal and transmitting the communication check signal prior to the transmission of the emergency signal, a reply signal can be received from a relay mobile station capable of communicating with the base station. is there.

The fourth effect is that the possibility of communication can be confirmed in a wide range.

[0098] The reason is that the above-mentioned communication check signal is executed on all channels with which the mobile station can communicate.

The fifth effect is that the emergency message can be repeatedly transmitted and the influence on traffic can be minimized even in the repeated transmission.

The reason is that the length of the emergency message is limited and stored in the storage unit.

A sixth effect is that it is possible to confirm that an emergency signal has arrived at a relaying mobile station or base station.

The reason is that, when the emergency signal arrives, the reception notification signal, which has received the emergency signal from the relaying mobile station and the base station, is returned to the transmission source.

A seventh effect is that when the destination is a mobile station, an emergency signal can be directly delivered without going through a base station.

The reason is that since the relaying mobile unit identifies the emergency signal addressed to itself, it can receive the emergency signal addressed to itself from another mobile unit without transferring it.

An eighth effect is that a reply message to an urgent message can be transferred.

The reason is that a reply message is provided and the relay mobile station stores the reply message in the reception notification signal in response to the emergency signal, including the reply message.

The ninth effect is that mobile stations can communicate with each other as a transceiver for switching between transmission and reception.

[0108] The reason is that the above-described mobile station is capable of transmitting and receiving signals of the same frequency and has means (switches) for switching transmission and reception.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a mobile device according to the present invention.

FIG. 2 is an explanatory diagram showing one form of a positional relationship between a mobile device and a base station.

FIG. 3 is an explanatory diagram showing one form of a signal flow between a mobile station and a base station according to the present invention.

FIG. 4 is a flowchart showing an embodiment of a procedure for transmitting (A) and relaying (B) an emergency signal according to the present invention.

FIG. 5: Transmission of a communication check signal in the present invention (A)
9 is a flowchart showing one mode of the procedure of relay and (B).

FIG. 6 is a flowchart showing an embodiment of a procedure for sending (A) and relaying (B) a voice message according to the present invention.

FIG. 7 is a flowchart showing one embodiment of a procedure when a reply message is provided in the present invention.

FIG. 8 is a flowchart showing one mode of a procedure of the calling party mobile station (A) and the called party mobile station (B) in the transceiver mode in the present invention.

FIG. 9 is a block diagram showing another embodiment of the mobile device according to the present invention, which is different from FIG. 1;

FIG. 10 is a block diagram illustrating an example of a conventional mobile device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 Duplexer 3, 30 Switch 4, 12, 22, 32 High frequency amplifier 5 Mixing circuit 6 Demodulation circuit 7, 70 Control unit 8, 80 Local oscillation circuit 9, 90 Storage unit 10 Telephone circuit 11, 21, 31 Modulation circuit 13 , 23,33 Power amplifier circuit 3A Service area 3B Base station 3M1,3M2 Mobile station

Claims (8)

[Claims] 1. A mobile communication system in which communication is performed using a radio wave for a downlink channel transmitted from a base station to a mobile station and a radio wave for an uplink channel transmitted from the mobile station to the base station. Is a mobile communication system comprising: a transmitting / receiving unit that performs communication between mobile devices using the downlink channel radio waves. 2. The mobile station according to claim 1, wherein the mobile station includes a transmission / reception splitter for a receiving unit that receives a downlink channel radio wave transmitted from the base station, and a downlink channel transmitted to another mobile station. A mobile communication system characterized by comprising a transmission / reception branching filter that shares a transmission / reception branching filter for a transmission unit that transmits radio waves for transmission. 3. The mobile station according to claim 1, wherein the mobile station transmits an uplink channel radio wave transmitted to a base station, and transmits a downlink channel radio wave transmitted to another mobile station. A mobile communication system characterized by having a main part shared with a unit. 4. A mobile communication system according to claim 1, wherein said mobile device includes the transmission / reception branching filter according to claim 2 and a main part according to claim 3. 5. The mobile communication system according to claim 1, wherein the mobile station switches transmission and reception of downlink channel radio waves to only one of transmission and reception. A mobile communication system comprising a switch. 6. The mobile communication system according to claim 1, wherein the mobile station includes an emergency mode selection unit configured to set an emergency, an emergency message, and an emergency message. Emergency code to identify, and storage means for storing a predetermined portion of an emergency signal to be exchanged with another mobile device in the event of an emergency, when the emergency mode is set by the emergency mode selection means, the emergency signal, The emergency message, the emergency code, and an emergency transmission means that synthesizes and creates a control signal including the self-identification code and transmits the control signal including the down-channel radio wave, and a signal received from another mobile station through the down-channel radio wave. When the emergency code is identified, the received signal is determined to be an emergency signal, predetermined information is stored in the storage unit, and a predetermined emergency signal is created and transmitted to the base station. A mobile communication system, comprising: an emergency signal transfer means for transmitting the signal by radio waves. 7. The base station according to claim 6, wherein when the base station identifies the emergency code from the signal received from the mobile station, the base station determines the received signal as an emergency signal, stores the predetermined information in the storage means, and A mobile communication system comprising: an emergency signal transfer unit that creates an emergency signal and sends the emergency signal to a destination of the received emergency signal. 8. The mobile station according to claim 6, further comprising a message output unit that reads out and outputs a stored emergency message from the storage unit when the emergency signal received from another mobile unit is addressed to itself. A mobile communication system characterized by the following.