JPH1023532A - Cellular cordless compatible telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a telephone call from a terminal moving at speed not receivable by a cordless telephone set during a cordless telephone call in the overlap area between a cellular telephone service area and a cordless telephone service area. SOLUTION: A cellular radio part 14 and a cordless radio part 17 detect moving speeds by moving speed detection parts 31 and 32 from the phasing pitches of their received waves and an operation control part 33 switches a switch 25 before it becomes impossible to receive at the moving speeds, for example, during a cordless telephone call to switch an operation part 24 including a transmission and reception part to a cellular telephone part 11 from a cordless telephone part 12, thus carrying out the telephone call through a cellular telephone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shared cellular / cordless telephone having functions of both a cellular telephone and a cordless telephone of a mobile communication system and capable of receiving services of both a cellular telephone system and a cordless telephone system.

[0002]

2. Description of the Related Art There has been proposed a shared telephone in which both functions of a cellular telephone and a cordless telephone in a mobile communication system are provided in the same telephone, and services of both the cellular telephone system and the cordless telephone system are provided. In general, a wireless base station of a cordless telephone system is small and can be easily installed. Therefore, a large number of wireless base stations of a conventional cellular telephone system are installed in homes, buildings, underground shopping malls, and the like. For this reason, in the related art, when the telephone operates outdoors as a cellular telephone and continues to move indoors, when the telephone detects that the radio wave of the cellular radio base station cannot be received, the operation is switched to the cordless telephone. Conversely, it is operating as a cordless phone,
It has been proposed that when a telephone detects that radio waves cannot be received from a wireless base station of a cordless telephone system, the operation is switched to a cellular telephone, thereby expanding the geographical use range of the telephone. Further, in general, the charge for the call of the cordless telephone system is often set lower than that of the cellular telephone system. Therefore, in consideration of economy, it has been proposed to give priority to the operation of the cordless telephone unit in an area where the control areas of the cellular telephone system and the cordless telephone system overlap.

[0003]

As a method for switching the operation of the cellular / cordless telephone, there is a method in which detection of radio wave reception failure from a radio base station is used as a trigger.
However, in this method, the operation is not switched in an area where the service area of the cellular telephone system and the service area of the cordless telephone system are geographically overlapped, and only one of the operations is continued. In the outdoors, the service area of the cordless telephone system is almost always also the service area of the cellular telephone system, and once the cordless telephone section operation is enabled in the overlapping service area, the cellular telephone section operation is enabled. It will not be.

In general, a cordless telephone system can be used at a moving speed such as walking since the control (service) area of each radio base station is narrow. Line connection processing time between telephones, so-called zone switching time, cannot keep up with the movement speed of the cordless telephone, and line connection may fail. For this reason, in cordless telephone systems,
In the high-speed movement state, the cordless telephone cannot make or receive calls. When the high-speed movement starts during a call and leaves the service area of the wireless base station, the call is disconnected, and the call is not guaranteed in practical use. As in the previous method,
If the trigger for switching operation of the cordless shared telephone is only detection of radio wave reception failure from the wireless base station, the operation switching does not occur as long as the radio wave from the wireless base station is received. Therefore, in the high-speed movement state during the operation of the cordless telephone, the cellular cordless telephone cannot make a telephone call, and there is a problem that the telephone cannot be restored to the telephone communicable state unless it is out of the service area of the cordless telephone system.

[0005] The present invention solves the above-mentioned problems, and when the mobile phone is moved at a high speed in a cordless telephone operating state, when a telephone call is disabled, the cellular phone can be automatically returned to a telephone enabled state. It is intended to provide a telephone.

[0006]

According to the present invention, the moving speed of a cellular / cordless telephone is detected by a speed detecting means, a cellular telephone service can be received when the detected speed is higher than a predetermined value, and a cordless service is available when the detected speed is lower than a predetermined value. The switching means is controlled by the operation control means so that the telephone service can be received.

[0007] The moving speed detecting means is based on the change state of each electric field strength of the received cellular radio wave and the received cordless radio wave.
The fading pitch is detected, and the smaller the fading pitch is, the higher the moving speed is associated. Alternatively, a measured speed signal from an automobile speedometer or the like on which the cellular cordless shared telephone is mounted is used. The switching by the switching unit changes one of the cellular control unit and the cordless control unit from invalid to valid and the other from valid to invalid. Alternatively, one of the cellular radio unit and the cordless radio unit is changed from invalid to valid, and the other is changed from valid to invalid.

[0008]

FIG. 1 shows an embodiment of the present invention.
A cellular telephone section 11 and a cordless telephone section 12 are provided. In the cellular telephone section 11, a cellular antenna 13 corresponding to a radio frequency band for a cellular telephone system is connected to a cellular radio section 14, and a cellular radio section 14 is provided by a cellular control section 15. Signal transmission / reception via a cellular radio channel to / from a cellular radio base station via is controlled.

In the cordless telephone section 12, a cordless antenna 16 corresponding to a cordless telephone system radio frequency band is connected to a cordless radio section 17, and a cordless control section 18 communicates with the cordless radio base station via the cordless radio section 17. Signal transmission and reception through a cordless wireless channel is controlled. An operation unit 24 including a transmission / reception unit 21 that performs electro-acoustic signal conversion and inputs and outputs voice, a display unit 22, and a key input unit 23 that performs key input and the like.
Are commonly provided, and the operation unit 24 is connected to the cellular control unit 15 or the cordless control unit 18 by the changeover switch 25, so that the operation unit 24 can function as a cellular telephone or can function as a cordless telephone. That is, for example, when the changeover switch 25 is connected to the cordless control unit 18, a control and communication signal flows between the cordless control unit 18 and the operation unit 24, and functions as a cordless telephone. By switching the switch 25, the cellular control unit 15 is enabled and the cordless control unit 18 is disabled, or the cellular control unit 15 is disabled and the cordless control unit 18 is enabled.

In this embodiment, in order to detect the moving speed of the cellular cordless shared telephone, the cellular radio unit 14 is used.
The cellular moving speed detecting unit 31 and the cordless moving speed detecting unit 32 are connected to the cordless radio unit 17 respectively. The cellular moving speed detecting unit 31 detects the cellular moving speed based on the electric field strength of the received radio wave detected by the cellular radio unit 14.・ Detect the moving speed of the cordless shared telephone. Similarly, the cordless moving speed detector 32 detects the moving speed of the cellular / cordless telephone based on the electric field strength of the received radio wave detected by the cordless radio unit 17. The detection of the moving speed based on the received electric field strength is described in, for example, Japanese Patent Application No.
As shown in JP-A-91333, the fading pitch (period) of the waiting control channel is detected. When the detected fading pitch is small, the moving speed is determined to be high, and when the fading pitch is large, the moving speed is determined to be low.

The detection output of the cellular movement speed detector 31 and the detection output of the cordless movement speed detector 32 are supplied to an operation controller 33. When the moving speed detected by the moving speed detecting units 31 and 32 becomes equal to or less than a predetermined value, the operation control unit 33 controls the changeover switch 25 to operate the operating unit 24.
Is connected to the cordless telephone unit 12 side, and when the moving speed becomes a predetermined value or more, the changeover switch 25 is controlled to operate the operation unit 24.
Is connected to the cellular telephone unit 11. This changeover switch 25
As a predetermined value of the moving speed for switching between, for example, 30 km /
And connect to the cordless phone unit 12 as much as possible,
If the cordless telephone unit 12 cannot receive the service of the cordless telephone system, or if it comes close to this state, it is preferable to receive the service of the cellular telephone system from the viewpoint of call charges. Further, hysteresis may be provided for the switching of the changeover switch 25 so that the switching is not frequently performed around the predetermined value.

FIG. 2 shows another embodiment of the present invention.
The same reference numerals are given to portions corresponding to. In this example, a switch 34 is inserted between the cellular antenna 13 and the cellular radio unit 14 in series, and similarly, a switch 35 is inserted between the cordless antenna 16 and the cordless radio unit 17 in series. And 35 are operation control units 33
, But when one is on, the other is off. The electric field intensity signal of each received radio wave is supplied from the cellular radio unit 14 and the cordless radio unit 17 to a common moving speed detecting unit 36, and the detected moving speed is controlled by the operation control unit 3.
3. The changeover switch 25 in FIG. 1 is omitted, and the cellular control unit 15 and the cordless control unit 18 are commonly connected to the operation unit 24. Under the control of the switches 34 and 35, the cellular radio unit 14 is enabled, the cordless radio unit 17 is disabled, or the cellular radio unit 14 is disabled, and the cordless radio unit 17 is switched to be enabled.

Also in the embodiment, the switching control by the operation control unit 33 is the same as that shown in FIG. 1, that is, the switch 34 is turned on at a speed higher than a predetermined moving speed to function as a cellular telephone, and at a speed lower than the predetermined moving speed. The switch 35 is turned on and functions as a cordless telephone. However, in the embodiment shown in FIG. 1, even when the cellular telephone unit 11 and the cordless telephone unit 12 simultaneously receive a call, it is possible to make a call with either side only by switching the changeover switch 25, but as shown in FIG. In this embodiment, only incoming calls to the telephone unit on which the switches 34 and 35 are turned on can be accepted. A switch 25 may be provided instead of the switches 34 and 35 as in FIG. 1, and the switching between the cellular telephone function and the cordless telephone function may be performed by this switching.

FIG. 3 shows still another embodiment of the present invention.
Parts corresponding to those in FIG. 2 are denoted by the same reference numerals. In this embodiment, when an external speed detecting device 38, for example, this cellular / cordless shared telephone is mounted on a car, a speed signal is input from a speedometer of the car to the operation control section 33 via a vehicle-mounted adapter. 1, switching between the cellular telephone unit 11 and the cordless telephone unit 12 is performed in accordance with the detected moving speed as shown in FIG. As in the case of FIG. 2, the cellular telephone section 11 and the cordless telephone section 12 are switched and connected to the operation section 24 by the changeover switch 25 as shown in FIG. Is also good.

[0015]

As described above, according to the present invention, the transmission / reception unit, the operation unit, and the like can be shared by the cellular telephone and the cordless telephone, and the overall configuration can be reduced in size. In areas where the area and cordless telephone service area overlap, even if cordless telephone service cannot be received due to high-speed movement, it automatically becomes a state in which it can talk as a cellular phone, and the state in which it can talk is maintained. You.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing another embodiment of the present invention.

FIG. 3 is a block diagram showing still another embodiment of the present invention.

Claims (5)

[Claims] 1. A cellular control section controls transmission and reception of a cellular radio channel to and from a cellular radio base station via a cellular radio section, and transmits and receives a cordless radio channel to and from a cordless radio base station via a cordless radio section. And a common cordless telephone unit and an operation unit are provided, and both the cellular telephone service and the cordless telephone service can be received under the control of the switching means. Means for detecting the moving speed of the cellular / cordless shared telephone; means for controlling the switching means so that the cellular phone service can be received when the detected moving speed is equal to or higher than a predetermined value and the cordless telephone service can be received when the detected moving speed is equal to or lower than a predetermined value. A cellular / cordless shared telephone comprising: 2. The apparatus according to claim 1, wherein the means for detecting the moving speed is means for detecting based on a change state of the electric field intensity of the radio wave received by the cellular radio section and the cordless radio section, respectively. The described cellular / cordless shared telephone. 3. The cellular / cordless shared telephone according to claim 1, wherein the means for detecting the moving speed is a speedometer provided separately from the cellular / cordless telephone. 4. The switching means according to claim 1, wherein one of the cellular control unit and the cordless control unit is changed from invalid to valid and the other is changed from valid to invalid.
A cellular / cordless shared telephone set according to any one of claims 1 to 3. 5. The switching means according to claim 1, wherein one of the cellular radio section and the cordless radio section is changed from invalid to valid and the other is changed from valid to invalid.
A cellular / cordless shared telephone set according to any one of claims 1 to 3.