JPS5824059B2 - Car phone unattended call method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a car telephone system in which a call is received when the mobile subscriber is absent, which makes it possible to identify the calling subscriber.

As a conventional car phone call receiving system when the car is not available, a part of the car phone radio device is made detachable, and this detachable part (hereinafter referred to as a radio paging device) is used.

) is equipped with a function similar to a pager, and when the mobile subscriber leaves the mobile vehicle, the mobile subscriber can receive a call in the same format as a pager by removing the wireless paging device and carrying it with him. A method is known in which this information is displayed using a buzzer or the like.

However, simply displaying an incoming call does not allow the user to know which of the many subscribers is the calling subscriber, and therefore cannot make a call for a response when returning to the car.

The present invention improves the above-mentioned drawbacks, and its purpose is to display the calling subscriber number when there is an incoming call even when the mobile subscriber leaves the car. The purpose is to make it possible to immediately make a call for a response when the user returns to the car.

Examples will be described in detail below.

FIG. 1 is a block diagram of an embodiment of the present invention, in which 1 is a general subscriber accommodated in a fixed station, 2 is a fixed station, 3 is a mobile telephone exchange, and 4 is a common terminal for the mobile telephone exchange. Control device,
5 is a base station, 6 is an antenna of the wireless base station, 7 is an antenna for a car, 8 is a car phone radio device, 9 is a car phone terminal, 10 is a radio paging device with a response that can be attached to and detached from the car phone radio device 8. When the mobile subscriber leaves the car, the mobile subscriber detaches the answering radio paging device 10 from the car phone radio device 8 and carries it with him, and when he returns to the car, he attaches it to the car phone radio device 8.

An incoming control channel P-CH1, a communication channel 5-CH, and an outgoing control channel A-CH are provided between the base station 5 and the car telephone radio device 8, and the answering radio paging device 10 is connected to the car phone. When attached to the wireless device 8, that is, when the mobile subscriber is in a car, it operates as a normal car phone.For example, when a call is made from the general subscriber 1 to the mobile subscriber, the fixed station 2, A simultaneous call is made from the base station 5 via the mobile telephone exchange 3 on the incoming control channel P-CH.

The called mobile subscriber number is added to this simultaneous paging, and the mobile phone radio equipment 8 of each mobile subscriber checks it against its own subscriber number, and if it matches, the incoming control channel P- An incoming call response signal is sent on the uplink of the CH.

When the mobile switching center 3 receives this incoming call response signal via the antenna 6 and the radio base station 5, it selects and designates an available call channel 5-CH, and assigns the channel number to the incoming call control channel P-CH. Notification is made using the downlink.

Next, after performing a loop check on the designated communication channel 5-CH, a paging signal is sent to the mobile subscriber.

All of the above-mentioned operations are performed automatically, and a call is started by responding to the calling signal by turning the handset off-hook or the like.

Next, a case will be described in which the radio paging device 10 with response is removed, that is, a case where the mobile subscriber leaves the automobile carrying the radio paging device 10 with response.

The radio paging device 10 with response includes means for receiving and identifying paging information via an incoming control channel, means for transmitting calling subscriber number request information, and means for displaying a calling subscriber number. If you are carrying only the answering radio paging device 10 and receive a simultaneous call similar to the above,
The called mobile subscriber number on the incoming control channel P-CH is compared with the subscriber's own subscriber number, and based on the matching, it is identified that the call has been made to the subscriber, and the calling subscriber number is requested. The information is sent over the incoming control channel.

At the base station 5, the calling subscriber number billing information via the incoming control channel P-CH is transferred to the common control device 4 of the mobile telephone exchange 3.

The common control device 4 requests the calling subscriber number from the fixed station 2,
The calling subscriber number sent from the fixed station 2 is sent to the base station 5.
and sends it out on the incoming control channel P-CH.

The response radio paging device 10 receives this calling subscriber number and displays it on the display means.

In this case, a buzzer or the like may be sounded to notify the mobile subscriber that the calling subscriber number has been displayed.

The means for transferring the calling subscriber number can employ various known means, and the fixed station 2 that has identified a call to a mobile subscriber transfers the called mobile subscriber number. At times, the calling subscriber number is identified and transferred simultaneously and stored in a memory (not shown) of the mobile telephone exchange 3;
It is also possible to send out the calling subscriber number stored in the memory with the calling subscriber number request information.

FIG. 2 is a block diagram showing an example of the car telephone radio device 8, in which 11 is a car antenna, 12 is a duplexer, 13 is a transmission frequency converter, 14 is a modulator, and 15.19
is an audio amplifier, 16 is a transmitter, 17 is a receiving frequency modulator, 18 is a demodulator, 20 is a receiver, 21 is a local oscillator,
22 is a control signal decoder that decodes channel switching control signals during a call, 23 is a channel designation circuit, 24 is a mobile station control circuit that controls each part of the car telephone radio device based on the signals from the control signal decoder, and 25 is a The radio paging receiving decoder 26 is a calling subscriber number display with a preset button, and the part surrounded by a dotted line is the answering radio paging device 10 shown in FIG.

The radio paging device with response 10 is removable as described above, and when the radio paging device with response is attached,
It operates as a normal car phone, and calls are made by answering incoming calls and making calls.The explanation is omitted here.
A case where the wireless paging device 10 with response is removed, that is, a case where the mobile subscriber carries the wireless paging device 10 with response and leaves the automobile will be explained.

When removing the radio paging device 10 with response, press the preset button on the calling subscriber number display 26 with preset button to preset the information for requesting the calling subscriber number at the time of incoming call into the radio paging reception decoder 25. .

When the preset button is pressed, the radio paging reception decoder 25 specifies the P-CH number of the incoming control channel currently on standby to the channel designation circuit 23.

The channel designation circuit 23 controls the local oscillator 21 to
Transmission and reception to and from the base station are performed using this designated incoming control channel P-CH number.

From the base station, an incoming control channel P- similar to that described above is transmitted.
When there is a simultaneous call by CH, the car antenna 11
, transmitter/receiver duplexer 12, reception frequency converter 17, demodulator 18
The received signal is applied to the radio paging reception decoder 25 via the radio paging reception decoder 25.

The radio paging reception decoder 25 receives the incoming control channel P.
- When the called mobile subscriber number by the CH is compared with the own subscriber number and it is determined that the call has been made by the matching, the preset calling subscriber number billing information is sent to the modulator. 14, the signal is transmitted via the transmission frequency converter 13, the transmitter/receiver duplexer 12, and the automobile antenna 11 on the above-mentioned incoming control channel P-CH.

When the base station receives the calling subscriber number billing information, it performs the same operation as described above and transmits the incoming control channel P-CH.
The calling subscriber number is sent by .

This calling subscriber number is applied to the radio calling receiving decoder 25 via the automobile antenna 11, the duplexer 12, the receiving frequency converter 17, and the demodulator 18, and is decoded.
The decoding result is displayed on the calling subscriber number display 16 with a preset button.

It is of course possible to display the calling subscriber number by pressing the preset button even when the radio paging device 10 with response is attached.

As explained above, the present invention enables a wireless paging device with a response to be freely removed from a car telephone wireless device, and includes a means for receiving and identifying paging information on an incoming control channel in the wireless paging device with a response, and a means for receiving and identifying paging information via an incoming control channel. Since the device is equipped with a means for transmitting calling subscriber number request information and a means for displaying the calling subscriber number, even if the mobile subscriber leaves the car, the calling subscriber can still subscribe if there is an incoming call. The user can know the driver's identification number, and can immediately make a response call when returning to the car.

In addition, there is no need to register the absence with the base station when the answering radio paging device is removed, and the calling subscriber number request information is sent only when there is an incoming call, so the use of radio frequencies is reduced. It has the advantage of being efficient.

Furthermore, since transmission and reception are carried out only through the incoming control channel P-CH, there is an advantage that the radio paging device with response can be easily digitized and is suitable for miniaturization.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram showing the structure of a car telephone radio device. 1 is a general subscriber, 2 is a fixed station, 3 is a mobile telephone exchange,
4 is a common control device, 5 is a radio base station, 6 is an antenna of the radio base station, 7 and 11 are car antennas, 8 is a car phone radio device, 9 is a car phone terminal, 10 is a radio paging device with response , 12 is a duplexer, 13 is a transmission frequency converter, 14 is a modulator, 15 and 19 are audio amplifiers, 16
is a transmitter, 17 is a receiving frequency converter, 18 is a demodulator, 2
0 is a receiver, 21 is a local oscillator, 22 is a control signal decoder, 23 is a channel designation circuit, 24 is a mobile station control circuit,
25 is a receiving decoder for radio calling, and 26 is a calling subscriber number display with a preset button.

Claims (1)

[Claims] 1. A transmitter that sends information to a base station, a receiver that receives information from the base station, a local oscillator that applies a signal of a frequency corresponding to the frequency used by the transmitter and receiver, and a position. A control channel for outgoing calls, a control channel for incoming calls, and a call channel are provided between the base station and the car phone using a car phone radio device equipped with a control unit that controls registration, call origination, and call reception operations. , in a car telephone system in which mutual communication is carried out, the transmitting part, the receiving part, the local oscillation part, and the receiving part provided in the control part, which constitute a part of the main body of the car telephone wireless device, are used. identification means for identifying the paging information received from the base station on the incoming control channel; a sending means for sending newly provided calling subscriber number request information via the transmitter; and a calling subscriber number. A radio paging device with a response is provided to be removable from the main body of the car phone radio device, and when the radio paging device with a response is not removed from the main body of the car phone radio device, it can be operated normally. It operates as a car phone, and when removed, when the identification means detects an incoming call, the sending means sends calling subscriber number billing information via the transmitting section through the incoming control channel, and transmits calling subscriber number request information to the base station sends a calling subscriber number through the incoming control channel according to the calling subscriber number request information;
A car telephone absent call receiving system characterized in that the calling subscriber number is received and displayed on the display means.