JPH01143457A - Automobile telephone system - Google Patents

Abstract

PURPOSE:To attain the calling of a caller from the side of an automobile telephone subscriber by providing an absence incoming call information recording function to an automobile telephone terminal set and an automobile telephone exchange. CONSTITUTION:A subscriber of an automobile telephone terminal set 1 turns on an absence incoming call information request key 6 before the interruption of the power supply of an automobile after the parking. Then an absence incoming call information request signal is sent to a radio base station 8 through a radio transmitter-receiver 8 and an antenna 2. A central processing unit 13 of an automobile telephone exchange 12 receives the signal to monitor an incoming call to the said automobile telephone terminal set 1 afterward. That is, when a call comes from a telephone subscriber of a telephone exchange 18 connecting to a public telephone communication network 17, the caller number is stored in a memory device 14. This is implemented in the even of an incoming call by applying a caller number request to the telephone exchange 18 and recording the information of the caller number received from the telephone exchange 18 to the memory device 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a car telephone system, and more particularly to a car phone system having a function of displaying caller information when the called party is not present.

[Prior Art] Generally, a car telephone terminal is located inside a car, and as a result of the car being left unattended while the car is parked, there is a tendency for a large number of incoming calls to occur when the called party is not present.

In this case, in conventional car phone systems, if a call is received when the called party is absent, the caller has no choice but to abandon the call, and the caller must wait a while before calling again. did not become.

On the other hand, since no information about the called party's absence remained, there was no way to contact the caller who made the call while the called party was absent.

[Problems to be Solved] In the conventional car phone system described above, the caller cannot obtain information about incoming calls while the caller is absent, and the caller has to make a re-call at a timely manner. As a result, there was a problem in that the number of incomplete calls was unavoidable, which was undesirable in terms of effective use of radio frequencies.

The present invention has been made in view of the above-mentioned problems, and aims to provide a car phone system that reduces incomplete calls, improves the usage efficiency of the car phone system, and makes effective use of radio frequencies. do.

[Means for Solving Problems] In order to achieve the above object, the car telephone system of the present invention includes a car phone terminal and a car telephone exchange, in which the car phone terminal is provided with the a signal sending means for transmitting a message requesting the car telephone exchange to store the information on the unattended incoming call; and a display means for displaying the information on the unattended incoming call sent from the car telephone exchange. The car telephone exchange is provided with an absent incoming call information recording means for recording call number information when there is an incoming call to the car phone terminal after receiving the message, and the car phone terminal. and unattended call information sending means for sending unattended call information to the mobile telephone terminal when the power is turned on again.

[Example] Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a system configuration diagram of a car telephone system according to an embodiment of the present invention.

In the figure, 1 is a car phone terminal, and antenna 2
, a wireless transceiver 3, a control circuit 4, a display circuit 5, an absent call information request key 6, and a transmitting/receiving circuit 7. This car phone terminal l is connected to a wireless base station 8.
Transmits and receives wireless signals to and from the

On the other hand, the wireless base station 8 includes an antenna 9 and a wireless transceiver 10.
, and a radio base station control device 11.

Further, 12 is a car telephone exchange, and the central processing unit 1
3 and a memory device 14. The wireless base station 8 and the mobile telephone exchange 12 are connected by a telephone line 15 and a data line 16. Further, this car telephone exchange 12 is connected to a telephone exchange 18 via a public telephone communication wi 17, and is further connected to a telephone subscriber terminal 19.
is connected to.

In the above configuration, the subscriber of the car telephone terminal 1 turns on the absent call information request key 6 after parking the car and before turning off the power of the car. Then, an absent incoming call information request signal is transmitted to the wireless base station 8 through the wireless transceiver 3 and antenna 2.

Furthermore, this signal is received by the radio transceiver lO at the radio base station 8 and then analyzed by the radio base station controller 11. The data is then sent to the car telephone exchange 12 via the data line 16.

By receiving this signal, the central processing unit 13 of the car telephone exchange 12 subsequently switches the corresponding car phone terminal l.
Monitor incoming calls to. That is, public telephone communication network 17
When an incoming call is received from a telephone subscriber of the telephone exchange 18 connected to the telephone exchange 18, the caller number is stored in the memory device 14. This means that when an incoming call occurs, the telephone exchange 1
8, and records the information of the calling number received from the telephone exchange 18 in the memory device 14.

After a certain period of time has elapsed, when the parked car is powered on again, location registration information is transmitted from the car phone terminal 1 to the automatic telephone exchange 12 via the wireless base station 8. When the central processing unit 13 detects this signal, it determines that the power to the corresponding mobile telephone terminal l has been turned on again. Then, the incoming call information during the absence is retrieved from the memory device 14 and sent to the car telephone terminal l via the data line 16 and the wireless base station 8 along with the calling signal.

In the car telephone terminal l, this signal is received by the antenna 2 and the wireless transceiver 3, analyzed by the control circuit 4, and displayed on the display circuit 5.

As described above, in this embodiment, the car phone terminal has a function that sends a message requesting information on an absent incoming call before the user is absent, and the car phone exchange has a function that allows an incoming call to be sent to the corresponding terminal upon reception of this message. If so, C
CITT No. 7 signal system or CCITT
A function that reads the caller's number using the R2 signaling system and stores that information in memory, and detects a location registration message when the power of the relevant car phone terminal is turned on again allows the above-mentioned absent called party information to be transmitted from the car phone exchange to the car phone. It has the function of transmitting the information to the terminal and the function of displaying the information on the car phone terminal.

It should be noted that the present invention is not limited to the above embodiments, but includes various modifications within the scope of the gist. For example, in the above-described embodiment, the operation is performed during an incoming call from a subscriber of a public telephone communication network, but the same operation can be performed during an incoming call from another car telephone terminal.

Furthermore, the vehicle may be configured to automatically make calls to callers one after another by a control circuit based on the displayed incoming call information. With this kind of configuration,
This will further improve the usability of the car phone system.

[Effects of the Invention] As explained above, the present invention provides the car telephone terminal and the car telephone exchange with an unattended incoming call information recording function, thereby making it possible to know the incoming call information while the car is away. As a result of making it possible for the subscriber to call the calling party, it is possible to provide a car telephone system that can improve the efficiency of car phone communication.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of a car telephone system according to an embodiment of the present invention. l: Car telephone terminal 5: Display circuit 6: Missing call information request key 12: Car telephone exchange 13: Central processing unit 14: Memory device

Claims (1)

[Scope of Claims] In a car phone system comprising a car phone terminal and a car phone exchange, the car phone terminal stores information on incoming calls during an absence to the car phone exchange before turning off the power. and a display means for displaying missed incoming call information sent from the mobile telephone exchange, and the mobile telephone exchange, after receiving the message, An absent incoming call information recording means for recording the calling number information when there is an incoming call to the above car phone terminal; 1. A car telephone system comprising: an absent incoming call information sending means for sending unattended incoming call information. (2) The unattended call information sending means starts sending the unattended call information based on the location registration information sent when the car phone terminal is powered on. A car telephone system according to scope 1.