JPH0645979A - Communication system for portable telephone terminal - Google Patents

Abstract

PURPOSE:To attain a battery exchange without disconnecting a communication line even when the output voltage of a portable telephone terminal drops while being talking over the telephone between the portable telephone terminal and the other telephone terminal. CONSTITUTION:When a main battery output voltage monitoring circuit 3 of a portable telephone terminal 1 detects the drop of the output voltage of a main battery, an automatic power source switching circuit 6 switches the main battery to an auxiliary battery 9, and a control part 5 communicates the information of the drop of the output voltage of the main battery to a mobile telephone switchboard 14. The mobile telephone switchboard 14 receives the information from the portable telephone set 1, communicates the battery exchange to the other side subscriber, and holds the line of contact in a fixed time regardless of a radio carrier state. Thus, the main battery can be exchanged while the communication is maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system of a mobile phone terminal in a mobile phone exchange system, and more particularly, to a mobile phone terminal capable of battery replacement when the main battery output voltage of the mobile phone terminal drops during a call. Regarding the communication method of.

[0002]

2. Description of the Related Art In a conventional mobile telephone exchange system, a communication method of a mobile telephone terminal uses a replaceable control main battery as a power source for communication of the mobile telephone terminal via a mobile telephone exchange. When the output voltage of the mobile phone terminal drops during a call, the mobile phone subscriber is notified by a buzzer and then the call line is disconnected. After the battery is replaced, the call line is reconnected to make a call.

[0003]

However, in this conventional communication system for mobile phone terminals, if the output voltage drops during a call, the call line is disconnected, and
Since the call line cannot be restored even after battery replacement, there is a problem that the operation is complicated because it is necessary to call again to restart the call.

The present invention has been made in view of the above problems, and is a portable telephone terminal in which the battery can be replaced without disconnecting the communication line when the output voltage is lowered and the battery needs to be replaced. The purpose is to provide a communication method.

[0005]

In order to achieve the above object, the communication system of a mobile phone terminal according to the present invention uses a replaceable control main battery as a power source for communication of a mobile phone terminal via a mobile phone exchange. In the communication method of the mobile phone terminal to perform,
Monitoring means for monitoring the output voltage of the main battery in the mobile phone terminal; reporting means for reporting to the mobile telephone exchange via a wireless carrier when the voltage monitoring means detects a decrease in the output voltage of the main battery; The monitoring means is provided with a switching means for switching the power supply of the mobile phone terminal from the main battery to the spare battery when the above detection is made, and the mobile telephone exchange reports the main battery voltage drop from the reporting means of the mobile phone terminal. The receiving means for receiving and the call line holding means for holding the call line for a certain period of time regardless of the state of the wireless carrier when the receiving means receives the report are provided.

Then, if necessary, the mobile telephone exchange is provided with a notifying means for notifying the other subscriber that the battery is being exchanged when the receiving means receives the report.

[0007]

According to the communication system of the mobile phone terminal configured as described above, when the decrease in the output voltage of the main battery is detected in the mobile phone terminal, it is reported to the mobile phone exchange and the standby battery is powered on. Can be switched. On the other hand, in the mobile telephone exchange, the communication path is maintained for a certain period of time regardless of the state of the wireless carrier receiving the output voltage drop information from the mobile phone.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a mobile telephone exchange system to which a communication system of a mobile telephone terminal of the present invention is applied.

In the figure, 1 is a mobile telephone terminal, 13 is a radio base station of the mobile telephone terminal 1, 14 is a mobile telephone switchboard, and joins with the mobile telephone terminal 1 via the radio base station 13 and the public network 15. The connection process with the person 16 is performed.

In the portable telephone terminal 1, 4 is a replaceable main battery, and 3 is a main battery output voltage monitoring circuit for monitoring the output voltage of the main battery 4. Reference numeral 5 denotes a control circuit, which reports to the mobile telephone exchange 14 via the transmitter 8 and the directional coupler 10 when the main battery output voltage monitoring circuit 3 detects a decrease in the output voltage of the main battery 4. It has a function and a function of issuing a switching command of the switching circuit 6. The switching circuit 6 switches the power source from the main battery 4 to the spare battery 9 in response to the above switching command. Further, 2 is a buzzer that is activated by the control circuit 5, and 7 is a receiver.

Further, the mobile telephone exchange 14 has a receiving function for receiving a report of the main battery voltage drop from the portable telephone terminal 1 and, when receiving the report, holds the communication line for a certain period of time regardless of the state of the wireless carrier. It is provided with a call line holding function and a notification function of notifying the partner subscriber 16 that the battery is being replaced when the above report is received.

Therefore, the communication method according to this embodiment operates as follows. When the main battery output voltage monitoring circuit 3 detects a decrease in the output voltage of the main battery 4 during a call by the mobile phone subscriber who owns the mobile phone terminal 1 with the general phone subscriber 16 using a known method, this is the control circuit 5. Be transmitted to. The control circuit 5, which has received the output voltage drop information,
The buzzer 2 is sounded, and the output voltage drop information is transmitted via the transmitter 8 and the directional coupler 10 from the antenna 11 via the wireless carrier to the antenna 12, the wireless base station 13
The data is transmitted to the mobile telephone exchange 14 via the communication.

The mobile telephone exchange 14 notifies the ordinary telephone subscriber 16 through the public network 15 that the battery is being exchanged, and the radio carrier disconnection signal from the radio base station 13 is not regarded as the end of call for a certain period of time. To

Further, the control circuit 5 of the portable telephone terminal 1 which has finished the output voltage drop report switches the power source to the spare battery 9 by the automatic power source switching circuit 6 and holds the call information other than the radio. The wireless base station 13 that cannot receive the wireless carrier due to the battery exhaustion of the mobile phone terminal 1 sends a carrier disconnection signal to the mobile phone exchange 14. The mobile telephone switching center 14 invalidates the telephone when the battery is on hold and the telephone line is maintained.

The main battery 4 of the portable telephone terminal 1 is replaced, the main battery output voltage monitoring circuit 3 detects the recovery of the output voltage of the main battery 4, and the control circuit 5 uses the automatic power switching circuit 6 to switch the main power source. The call is resumed by returning to the battery 4 and sending the wireless carrier from the antenna 11 of the mobile phone terminal 1 to the wireless base station 13 via the antenna 12 according to the held call information.

[0016]

As described above, according to the communication system of the portable telephone terminal of the present invention, when the output voltage of the battery drops during a call, the main battery output voltage drop information is sent to the mobile telephone exchange and provided. Since it switches to the spare battery and keeps the call line, it is possible to replace the main battery while holding the call, and it is possible to resume the call without having to call the other subscriber again after the battery is replaced. Have.

If the other party subscriber is informed during the battery exchange that the battery is being exchanged, the general subscriber party is more likely than the conventional system in which the call is disconnected without notifying the disconnection reason. It has the effect of being able to provide kind service.

[Brief description of drawings]

FIG. 1 is a block diagram showing a mobile telephone exchange system to which a communication system of a mobile telephone terminal according to an embodiment of the present invention is applied.

[Explanation of symbols]

 1 Mobile Phone Terminal 2 Buzzer 3 Main Battery Output Voltage Monitoring Circuit 4 Main Battery 5 Control Circuit 6 Automatic Power Supply Switching Circuit 7 Receiver 8 Transmitter 9 Spare Battery 10 Directional Coupler 11 Antenna 12 Antenna 13 Radio Base Station 14 Mobile Phone Switch 15 Public network 16 Regular telephone subscriber

Claims (2)

[Claims] 1. In a communication system of a mobile phone terminal in which communication of a mobile phone terminal using a replaceable control main battery as a power source is performed via a mobile phone switch, the output voltage of the main battery is supplied to the mobile phone terminal. Monitoring means for monitoring, and reporting means for reporting to the mobile telephone exchange via a wireless carrier when the voltage monitoring means detects a decrease in the output voltage of the main battery,
When the voltage monitoring means detects the above, a switching means for switching the power source of the mobile phone terminal from the main battery to the spare battery is provided, and the mobile telephone exchange is provided with the main battery voltage drop from the reporting means of the mobile phone terminal. Receiving means for receiving reports,
A communication system for a mobile phone terminal, comprising: a call line holding unit for holding a call line for a certain period of time regardless of the state of a wireless carrier when the receiving unit receives the report. 2. The communication of a mobile telephone terminal according to claim 1, wherein the mobile telephone exchange includes an informing means for informing a counterpart subscriber that the battery is being exchanged when the receiving means receives the report. method.