JPH05244085A - Portable mobile telephone terminal - Google Patents

Abstract

PURPOSE:To reduce the telephone rate for a subscriber, to manage a terminal used by the subscriber in one, and to attain space saving and improvement for operability. CONSTITUTION:Two numbers, that is a number for a cordless telephone set and a number for a mobile telephone terminal, are attached on a portable mobile telephone terminal 1, and also, a transmitter/receiver 11, control channel electric field strength measuring instrument 12. and a transfer request and cancellation code generator 14 are provided at the terminal. When it is identified that the electric field strength of a control channel from a cordless telephone master set 2 by the control channel electric field strength measuring instrument 12, the state of the portable mobile telephone terminal 1 to perform the issuance and reception of a call as a cordless telephone slave set is held under the control of a CPU 13. When the electric field strength goes down less than a certain value, a request to transfer an incoming call to the cordless telephone set to a portable mobile telephone set side is issued from the transfer request and cancellation code generator 14 under the control of the CPU 13 to hold a state where the issuance and reception of the call can be performed by the telephone set as the portable mobile telephone terminal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile car telephone terminal.

[0002]

2. Description of the Related Art Conventionally, a mobile telephone handset has a cordless telephone handset because a cordless telephone handset and a mobile telephone handset are separate terminals even if they are close to a cordless telephone handset. Can not be used as a machine,
Call processing was performed as a mobile phone terminal.

[0003]

Since the owner of the above-mentioned conventional portable car telephone terminal is convenient even in a place where it is possible to make and receive a call as a child device under the control of a cordless telephone, the owner of the portable car telephone terminal can use it. Considered to be used.

However, mobile communication uses a dedicated channel for mobile communication, so that there is a drawback that the cost for a call is high and therefore the call charge is high and the load on the subscriber is large.

Further, when the cordless telephone handset and the mobile telephone handset are used individually, the terminal cost is high, and the inconvenience that the owner selects and uses them,
There is a drawback that the installation space becomes large.

[0006]

The portable car telephone terminal of the present invention is provided with two cord numbers, a first telephone number as a cordless telephone and a second telephone number as a portable automobile telephone terminal. And a monitoring means for time-divisionally monitoring the electric field strength of a control channel of a specific cordless telephone master station and the control channel of a wireless base station as a mobile telephone, and the electric field strength of the control channel of a certain cordless telephone master station. When it is identified by the monitoring means that the number exceeds a certain value, if an incoming call to the first telephone number is registered as a transfer request to the second telephone number, the exchange is compatible with a cordless telephone. The transfer request is canceled, and the second call is sent to the car telephone exchange.
When an incoming call to the telephone number is registered as a transfer request to the first telephone number to make an incoming / outgoing call as a cordless telephone handset and the electric field strength is below a certain value, the monitoring means identifies: If the transfer request for the incoming call to the second telephone number is registered to the first telephone number, the transfer request is canceled to the car telephone exchange and the exchange corresponding to the cordless telephone is sent to the first telephone number. And a control means for making a transfer registration request to the second telephone number to make and receive an incoming call as a mobile phone.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a functional block diagram showing an embodiment of the present invention. As shown in FIG. 1, a mobile car telephone terminal 1 that also serves as a cordless phone handset includes a transceiver 1 that transmits and receives radio waves as a cordless phone handset and a mobile car phone.
1 and a control channel electric field strength measuring device for time-divisionally monitoring electric field strengths of a control channel from a cordless telephone master unit 2 connected to a public telephone network and a control channel from a wireless base station 3 connected to a mobile communication network. 12 and a processing unit (CP) for selecting whether to use the transceiver 11 as a cordless telephone handset or as a mobile car telephone, and for controlling incoming call transfer and cancel code transmission for incoming calls (CP
U) 13 and transfer request and cancellation code generator 14
And have.

Next, the operation of the present invention will be described. At the time of making a call from the terminal, the CPU 13 accesses the control channel electric field strength measuring device 12 which measures the electric field strength of the control channel from the cordless telephone base unit 2 and the wireless base station 3 in a time division manner, and the cordless telephone base unit 2 When the electric field strength of is above a certain level, the cordless telephone handset performs a call operation regardless of the strength of the electric field level of the control channel from the radio base station 3.

In a state other than during a call, that is, in a state of waiting for an incoming call, C
The PU 13 uses the control channel electric field strength measuring device 12 to
The electric field intensity of the cordless telephone base unit 2 and the electric field intensity of the control channel from the wireless base station 3 are monitored, and when the electric field intensity from the cordless telephone base unit 2 is above a certain level, the cordless telephone base unit waits for an incoming call.

When the control channel electric field strength measuring device 12 identifies that the electric field strength of the control channel from the cordless telephone master unit 2 has become lower than a certain level, an incoming call to the telephone number of the portable car telephone terminal is received. If there is a request to transfer to the telephone number of the cordless telephone, a cancellation request code is generated from the transfer request and cancellation code generator 14 in order to cancel it.
A cancel request is sent to the automobile telephone exchange via the wireless base station 3. Then, in order to make a transfer registration request to the mobile telephone for an incoming call to the telephone number of the cordless telephone, the transfer request and cancellation code generator 14 generates a transfer registration request code and sends the registration request code to the exchange compatible with the cordless telephone. After that, while the control channel electric field strength from the cordless telephone base unit 2 is below a certain level, the CPU
Reference numeral 13 waits for a state in which the mobile car telephone terminal 1 is used as a mobile car telephone terminal to wait for an incoming call and make a call.

When the control channel electric field strength measuring device 12 identifies that the electric field strength of the control channel from the cordless telephone base unit 2 exceeds a certain level, the CPU 13 makes an incoming call to the telephone number of the cordless telephone. If there is a request to transfer to the telephone number of the mobile car telephone terminal on the car telephone exchange side, a code for canceling the transfer is generated from the transfer request and cancellation code generator 14 to the cordless telephone compatible exchange. Then, an incoming call to the telephone number of the portable telephone terminal is sent to the telephone exchange of the mobile telephone to the telephone number of the cordless telephone.
4 and sends the transfer request registration code. After that, while the electric field strength of the control channel from the cordless telephone base unit 2 is above a certain level, the CPU 13 keeps the portable car telephone terminal 1 as a cordless telephone handset to wait for an incoming call and make a call.

[0013]

As described above, according to the present invention, a portable telephone terminal can be used as a cordless telephone slave unit within a certain range in which the electric field strength of the control channel from the cordless telephone is above a certain level. When the control channel electric field strength from the base unit is below a certain value,
Since it can be used as a mobile car phone terminal, it saves space and improves operability. It also reduces the number of times the mobile communication network is used compared to when using a mobile car phone alone, reducing the financial burden on subscribers. There is.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Mobile Car Telephone Terminal 2 Cordless Telephone Base Unit 3 Radio Base Station 11 Transmitter / Receiver 12 Control Channel Electric Field Strength Measuring Machine 13 CPU 14 Transfer Request and Cancel Code Generator

Claims (1)

[Claims] 1. A control channel of a specific cordless telephone master unit as a cordless telephone slave unit and a portable automobile provided with a first telephone number as a cordless telephone and a second telephone number as a portable telephone terminal. As a telephone, a monitoring means for time-divisionally monitoring the electric field strength of the control channel from the radio base station, and the monitoring means that the electric field strength of the control channel from a specific cordless telephone master unit exceeds a certain value. When identified, if an incoming call to the first telephone number is registered to the second telephone number as a transfer request, the transfer request is canceled to a switch compatible with a cordless telephone, and the mobile phone switch is switched to the first transfer request. The incoming call to the second telephone number is registered to the first telephone number as a transfer request, and the incoming and outgoing call is made as a cordless telephone handset. When the monitoring means discriminates that the number of incoming calls is less than a certain value, a transfer request is sent to the car telephone exchange if an incoming call to the second phone number is registered to the first phone number. And a control means for making an incoming call to the first telephone number to the second telephone number to the exchange compatible with the cordless telephone and making a transfer registration request to the second telephone number so as to make and receive the call as a mobile car telephone. Mobile car phone terminal.