JP2001231076A - Mobile radio terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a conventional mobile radio terminal provided with two synthesizers in its radio section requires a large-sized and expensive configuration for the terminal itself for the obtained effect because the increased number of the synthesizers and a transmission reception section are used only for improving the communication quality. SOLUTION: In the case that a function key permits waiting during a speech and a user 40 is busy with a base station 1/public network 43 (step 45), when the user recognizes the arrival of an incoming call from other party and depresses a 'speech' key, a notice of replying the incoming call is given to a base station 2/public network 44, which gives a reply acknowledge notice to a wireless system control section 41 by using a synthesizer different from the one so far used during the speech (step 59). Thus, the speech channel between the opposite terminal and an operation system control section 40 is kept open and brought into a holding state (step 61) and the channel is switched into a communication channel with the other terminal via the base station 2/public network 44 (step 62).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio terminal, and more particularly to a mobile radio terminal such as a simple portable telephone (PHS) having a plurality of synthesizers.

[0002]

2. Description of the Related Art FIG. 8 is a block diagram showing an example of a conventional mobile radio terminal. This mobile radio terminal is a simple mobile phone (P
HS) A, a radio unit 1 that performs radio communication with a base station (not shown), a memory 2 that records a required program and stores a message and the like, and a reception signal from the radio unit 1 A large-scale semiconductor integrated circuit (LSI) 3 equipped with a signal processing circuit for demodulating and converting a transmission signal into a predetermined format, and a central processing unit (CP) for performing various processes.
U) 4 and a call CPU (TE)
L-CPU) 5 and a sounder 6 that sounds a ring tone and the like.
And a microphone (MIC) 7 for converting a call voice to the partner terminal into an audio signal, a speaker (SP) 8 for converting a call voice signal from the partner terminal and the like to generate a voice, and a liquid crystal for performing various displays It comprises a display element (LCD) 9 and an input unit (KEY) 10 provided with various keys for dialing and other necessary inputs by telephone.

[0003] The conventional portable radio telephone A, which is a mobile radio terminal, has one synthesizer 11 and a transmission / reception unit 12 in the radio unit 1, and a sequence diagram shown in FIG. Call according to. Here, FIG.
In the middle, the operation system control unit (user) 20
C7, SP8, LCD9, KEY10 and other control units directly related to the user.
Reference numeral 1 denotes other parts inside the telephone.

Now, it is assumed that an incoming call notification from a partner terminal is sent from the public network and a base station (neither is shown) 23 to the radio system controller 21 in the portable telephone A of FIG. 8 (FIG. 9). Step 24), the wireless system control unit 21 notifies the operation system control unit 20 that the current wireless state is within the service area (step 25 in FIG. 9).
The sounder 6 inside rings a ring tone, and if there is a vibrator, the vibrator vibrates.

Subsequently, a radio setting notification for communication from the base station / public network 23 is sent to the radio system control unit 21 (step 26 in FIG. 9), whereby the radio system control unit 2 is notified.
1 notifies the operation system control unit 20 of the display of the incoming call (step 27 in FIG. 9), and notifies the base station / public network 23 that the call is being made (step 28 in FIG. 9). The display of the call is notified to the unit 20 and the image being called is displayed on the LCD 9 (step 29 in FIG. 9).

[0006] On the basis of this image display, the user can select KEY1.
When the "call" key in the "0" key is depressed, a notification that the call has been answered is sent to the radio system control unit 21 (step 30 in FIG. 9), whereby the radio system control unit 21 sets the base station / public network. 23 is notified of the incoming call response (step 3 in FIG. 9).
1). When a response confirmation notification is sent from the base station / public network 23 to the radio system controller 21 in response to the incoming call response, the radio system controller 21 notifies the operation system controller 20 of the confirmation of the incoming call (step in FIG. 9). 33) The LCD 9 displays that "calling" is in progress. Thereafter, the state shifts to a state of talking with the other party (step 34 in FIG. 9).

A portable telephone such as a portable portable telephone (PHS) A that performs such an operation has a small weight such as a weight of several grams and a capacity of several cc, that is, a small battery. The maximum standby time and the maximum talk time of how long the battery has (low power consumption and high performance with a battery), the memory capacity of storing hundreds of phone books and the recording of many memos, etc. Was a criterion for superiority to

[0008]

However, in recent years, the progress of mobile phones has been remarkable, and in order to judge the superiority over other models based on the above criteria, the technology of mobile phones has reached the point of maturity. No difference can be obtained, and on the other hand, in order to cope with a further change in the user's desire, the superiority with other models has been determined based on a different criterion than before. The above-mentioned different criterion is communication quality, for example, a digital mobile phone (CDMA machine) and a satellite mobile phone using spread spectrum technology are typical examples. These are proposals of service formats with completely different communication methods, aiming to further acquire customers.

[0009] On the other hand, there has been proposed a portable telephone which improves communication quality while maintaining the same service form as before. This means that two synthesizers and one transceiver unit are provided in the radio unit, and one or more base stations other than the one using the other synthesizer and the transceiver unit are not communicating while the other synthesizer and the transceiver unit are communicating. The electric field strength of the radio wave transmitted from the station on the control channel is measured, and the communication channel is switched to the base station transmitting the radio wave with the strongest electric field strength (so-called handover).

As a result, the handover can be made extremely fast, silence time can be reduced (for example, several hundred ms), and the connection rate can be improved, so that communication quality can be improved. This has been made possible by advances in data communication (from 32 kbps data communication to 64 kbps data communication) and the like.

However, the conventional mobile radio terminal provided with two synthesizers in the above-mentioned radio section uses a synthesizer and a transmission / reception section which are increased only for the improvement of communication quality. Since the configuration itself is large and expensive, it is required to further expand the range of use.

The present invention has been made in view of the above points,
It is an object of the present invention to provide a mobile radio terminal capable of further expanding a use range.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a mobile radio terminal having one or more transmitting / receiving sections and a plurality of synthesizers in a radio section for performing radio communication with a base station. A function instructing means for instructing permission or prohibition of standby during a call, a call key for permitting a call,
After selecting permission of standby by the function instructing unit, the second synthesizer of the plurality of synthesizers is connected to the first partner terminal using the first synthesizer and the one transceiver unit among the plurality of synthesizers. Setting means for setting a standby state from another partner terminal using a transmitting / receiving section or another transmitting / receiving section; and a standby state by the standby setting means, and during a call with the first partner terminal, Notification means for notifying the user that there is an incoming call from a second partner terminal different from the first partner terminal; and a first unit when the call key is pressed based on the incoming call notification from the second partner terminal. First call switching for switching a call with a partner terminal to a hold state and switching to a call state with a second partner terminal using a second synthesizer and a transmitting / receiving unit or another transmitting / receiving unit It is obtained by a structure having a unit.

According to the present invention, when the call key is depressed based on the incoming call notification from the second partner terminal, the call with the first partner terminal which has been in communication until then is switched to a hold state, and the incoming call is received. A function equivalent to a so-called call waiting (registered trademark) function for switching to a call state with the second terminal of the other party is performed by using a mobile radio instead of a base station or a communication network side controlling the call waiting function as in a well-known call waiting. This can be done by the terminal itself.

Further, in order to achieve the above object, according to the present invention, a call key is pressed when a call is on hold with the first partner terminal and a call is on hold with the second partner terminal. In some cases, the apparatus further comprises second call switching means for switching to a call state with the first partner terminal and to a call holding state with the second partner terminal. In the present invention,
The communication path with the second partner terminal that has been in the call state up to that point can be put on hold, and the call can be switched to the call with the first partner terminal that has been in the call hold state.

Further, in order to achieve the above object, the present invention provides the above-mentioned standby setting means, wherein a call is made between a first synthesizer of a plurality of synthesizers and a first transmitting / receiving section during communication with a first partner terminal. When the permission of standby is selected by the function instructing means, another base station capable of communication different from the base station in communication is communicated with the second synthesizer among the plurality of synthesizers using the transmitting / receiving section or another transmitting / receiving section. It is characterized in that it is searched and set to a standby state from another partner terminal. According to the present invention, even when the user is in a call state with the first partner terminal, when the standby of the standby is selected by the function instruction means, the standby state is set only by operating the mobile radio terminal while maintaining the call state. be able to.

Further, in order to achieve the above object, the present invention provides a method for communicating with a first partner terminal using a first synthesizer and a transceiver unit among a plurality of synthesizers.
And when the function instruction unit selects prohibition of standby during a call by using the second synthesizer and the transmission / reception unit or another transmission / reception unit of the plurality of synthesizers and in a standby state from another terminal. And a canceling means for canceling the standby state.

According to the present invention, the standby state can be canceled only by operating the mobile radio terminal while the standby state is maintained by the function instructing means.

[0019]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of a first embodiment of a mobile radio terminal according to the present invention. 8, the same components as those of FIG. 8 are denoted by the same reference numerals, and the description thereof will be omitted. The mobile radio terminal of this embodiment is a simple portable telephone (PHS) B, and a radio unit 14 for performing radio communication with a base station (not shown) includes two synthesizers 11a and 11b and one transmission / reception unit (TRX). ) 12a. Although the block configuration itself in FIG. 1 is the same as that of the conventional mobile radio terminal having two synthesizers in the above-described radio unit, the operation performed by the CPU 16 according to the control program stored in the memory 15 is different from that of the conventional mobile radio terminal. It is characterized by performing an operation unique to the present embodiment, which will be described below, which is different from the above.

In order to perform a specific operation of the present embodiment, it is necessary to select a function using a function key (function key) provided in the KEY 10 in FIG. As functions provided by the function key other than the call, there are conventionally known functions such as note the other party's voice, display their own phone number, adjust the receiving volume, and display the current call time. However, as described below, the present embodiment has a function similar to call waiting (registered trademark), a function of switching a call partner, a function of selecting / releasing, and the like.

A function key selection operation unique to this embodiment will be described with reference to FIG. When selecting a function,
When something is displayed on the screen of the CD 9 as indicated by 110 in FIG. 2A, pressing a function key permits or prohibits the standby during a call indicated by 111 in FIG. 2A. The screen is switched to a screen for selecting whether to perform.

When the user looks at this display and presses the numeric key "0", a message is displayed to indicate that standby during a call is permitted, as indicated by reference numeral 112 in FIG. You. Thereafter, the display automatically returns to the original screen, that is, the display during standby or the display during a call (113 in FIG. 2A). That is, this function selection can be made either during standby before a call or during a call.

When canceling the function selection, the screen of the LCD 9 on which a certain display is being performed (step 11 in FIG. 2B).
0) is switched to a screen for selecting whether to permit or prohibit standby during a call when the user presses the function key (111 in FIG. 2B). When the user looks at this display and presses the numeric key “1”, FIG.
As indicated by 5, a message indicating that standby during a call is prohibited is displayed on the screen of the LCD 9, and function selection is prohibited (function selection is released). Then automatically the original screen,
That is, the display returns to the display during standby or the display during a call (113 in FIG. 2B). In other words, this function selection can be released either during standby before a call or during a call.

Next, the operation of the embodiment shown in FIG. 1 when a function is selected before a call and an incoming call is received from another party during a call will be described with reference to the sequence diagram of FIG. In FIG. 3 and FIGS. 4 to 6 described later, the hardware 42 indicates the wireless unit 14 and the LSI 3 in FIG.
The operation system control unit 40 includes the sounder 6, the MIC 7, and the SP shown in FIG.
8, the LCD 9 and the KEY 10, and the wireless system control unit 41 has the other memory 15, CPU 16, and TEL
-Refers to the CPU 5.

Now, it is assumed that the portable telephone B is in a state of talking with the other terminal via the base station 1 and the public network (base station 1 / public network) 43 (step 45 in FIG. 3). At this time, the frequency signal of the communication channel transmitted from the base station 1 / the public network 43 is selectively received by the transmission / reception unit 12a according to the output signal of the synthesizer 11a, and then supplied to the LSI 3 and decoded. The output signal of LSI3 is CPU1
6 receives the known signal processing, and the audio signal from the other party is output to SP8. Further, the voice of the user is subjected to sound-to-electric conversion by the MIC 7, subjected to predetermined signal processing by the LSI 3, supplied to the TRX 12 a, and supplied to the synthesizer 11.
After being mixed with the signal from a and converted into a predetermined transmission frequency signal, it is transmitted wirelessly.

During this call, the radio system controller 41 requests the hardware 42 to search for another base station (step 4 in FIG. 3).
6). The hardware 42, for example, uses the synthesizer 11a and the transmitting / receiving unit 12a to transmit radio waves from the other base station 2 transmitted through the control channel during a call between the base station 1 and the public network using the synthesizer 11b and the transmitting / receiving unit. The signal is received using 12a (step 47 in FIG. 3), for example, the electric field intensity is measured, and the measurement result is notified to the wireless system control unit 41 (step 48 in FIG. 3). At this time, synthesizer 1
The transmission / reception unit 12a is operated at a timing shifted from 1a.

If the electric field strength is equal to or higher than the predetermined level, the radio system controller 41 notifies the operation system controller 40 of the completion of standby (step 49 in FIG. 3), and the radio system controller 4
1 and the base station 2 are in a standby state (step 50 in FIG. 3). In communication with the base station 1 / public network 43, an incoming call from another party is notified to the radio system control unit 41 via the public network and the base station 2 (base station 2 / public network 44). Then (step 51 in FIG. 3), the wireless system control unit 41 notifies the operation system control unit 40 of the display of the incoming call (step 52 in FIG. 3) and causes the LCD 9 to display the incoming call.

Subsequently, the wireless setting for communication from the base station 2 / public network 44 to the wireless control unit 41 is made (step 53 in FIG. 3), and the wireless control unit 41 responds to this setting. After performing wireless setting for communication with the base station 2 / public network 44 (step 54 in FIG. 3), the display of the call is notified to the operation system control unit 40 (step 56 in FIG. 3). It notifies the station 2 / public network 44 that it is calling (step 57 in FIG. 3).

The operation system control section 40 emits a catch sound from, for example, the SP 8 in response to the notification of the display of the call. This allows the user to know about incoming calls from other parties,
When the "call" key in the KEY 10 is pressed, a notification that the call has been answered is sent to the wireless system control unit 41 in the portable cellular phone B.
(Step 57 in FIG. 3), whereby the wireless system control unit 41 notifies the base station 2 / public network 44 of the incoming call response using the synthesizer 11b and the transmission / reception unit 12a (step 58 in FIG. 3).

Base station 2 / public network 44 receiving call response
Sends a response confirmation notification to the simplified mobile phone B, and sends a response confirmation notification to the wireless system control unit 41 through the synthesizer 11b and the transmission / reception unit 12a (step 59 in FIG. 3).
As a result, a confirmation of the incoming call is sent to the operation system control unit 40 (step 60 in FIG. 3), and the LCD 9 displays on the screen that a call is being made with another party.

Then, the communication channel between the other party's terminal that has been talking via the base station 1 / public network 43 and the operation system control unit 40 is held open (step 61 in FIG. 3). ), The radio section 14 performs voice path control for switching to a communication channel with another terminal that has notified the incoming call via the base station 2 / public network 44 during a call, and switches the other party to the other terminal (FIG. Step 62 of 3).

As described above, in this embodiment, a function equivalent to a so-called call waiting (registered trademark) function of switching to a call with another terminal that has been notified of an incoming call during a call can be obtained. However, in this embodiment, the base station or the communication network side does not control the call waiting function as in the well-known call waiting, but the point that the main body of the simple mobile phone B has the function, As a result, there is an advantage that whether or not to use this function can be realized by a simple operation and the selection can be made quickly without any use procedure or payment of a separate fee. Furthermore, since only one line is used, the cost can be reduced.

Next, the operation of the embodiment of FIG. 1 in the case where the function is selected before the call and the call partner is switched to another partner during the call will be described with reference to the sequence diagram of FIG. In FIG. 4, the same parts as those in FIG. 3 are denoted by the same reference numerals. A call is on hold between the operation system control unit 40 in the portable cellular phone B and the first partner terminal via the base station 1 / public network 43 (step 71 in FIG. 4),
Second via the operation system control unit 40 and the base station 2 / public network 44
When a call is being made with the other party terminal (step 72 in FIG. 4), the first communication path between the first party terminal and the operation system control unit 40, and the second party terminal and the operation system Control unit 4
The second communication paths between 0 and 0 are respectively open.

Therefore, when the user presses the "call key" in this state (step 73 in FIG. 4), the voice path is switched without performing the sequence with the base station, and the operation system control unit 40 and the base station 2 are switched. / Second connected to public network 44
Is switched to the call hold state with the other terminal (see FIG. 4).
Step 74), the communication between the operation system control unit 40 and the first partner terminal connected to the base station 1 / public network 43 is switched to the communication state (step 75 in FIG. 4).

To end the call with the other party, the user presses the disconnection key or the disconnection key is pressed by the other party to disconnect the call path, and the other party in the call hold state is disconnected. You can switch to the communication path with the terminal. As described above, in this embodiment, it is possible to easily switch to a communication path with a partner terminal in a call holding state during a call.

Next, the operation of the embodiment of FIG. 1 when a function is set during a call will be described with reference to the sequence diagram of FIG. In FIG. 5, the same parts as those in FIG. 3 are denoted by the same reference numerals. Operation system control unit 4 in simple mobile phone B
When the user presses the "function" key and the numeral key of "0" when the user is in a call state with the other terminal via the base station 1 / public network 43 (step 81 in FIG. 5) (FIG. 5 (step 82 in FIG. 5), as described with reference to FIG. 2 (A), the standby during the call is permitted, and the operation system control unit 40 issues a standby request during the call to the wireless system control unit 41 (step 83 in FIG. 5). Upon receiving the request, the wireless system control unit 41 issues a search request to the hardware 42 (step 84 in FIG. 5).

Thus, the hardware 42 uses, for example, the synthesizer 11a and the transmission / reception section 12a to transmit the base station 1 /
During a call with the public network, a radio wave transmitted from another base station 2 / public network 44 transmitted on the control channel is received using the synthesizer 11b and the transmitting / receiving unit 12a (step 85 in FIG. 5), For example, the electric field intensity obtained from the LSI 3 is measured, and the measurement result is notified to the wireless system control unit 41 (step 86 in FIG. 5). At this time, synthesizer 1
The transmission / reception unit 12a is operated at a timing shifted from 1a.

If the electric field strength is equal to or higher than the predetermined level, the radio system controller 41 notifies the hardware 42 of the synchronous reception of a control frequency other than the frequency during the call, and the base station 2 / public network 44
5 (steps 87 and 88 in FIG. 5) and upon receiving a synchronous reception completion notification from the hardware 42 (step 89 in FIG. 5), notifies the operation system control unit 40 of the standby completion. (Step 90 in FIG. 5).

As a result, the portable cellular phone B transitions to a state in which it can accept an incoming call, and in a state where a call is being made between the operation system control unit 40 and the partner terminal via the base station 1 / public network 43, the wireless communication is performed. A transition is made between the system controller 41 and the base station 2 / public network 44 to a standby state (steps 91 and 9 in FIG. 5).
2). As described above, in this embodiment, even during a call, it is possible to make a transition to a state in which an incoming call from another partner terminal can be accepted by selecting a function.

Next, a description will be given of the operation of the embodiment of FIG. 1 in the case where the function is selected before the call and the call partner is switched to another party during the call, with reference to the sequence diagram of FIG. In FIG. 6, the same parts as those in FIG. 5 are denoted by the same reference numerals. While the portable cellular phone B is in a call between the operation system control unit 40 and the other terminal via the base station 1 / public network 43, the wireless system control unit 41 and the base station 2 / public network 44 It is assumed that the mobile phone is in a standby state (see FIG. 6).
Steps 91 and 92).

In this state, when the user presses the "function" key and the numeral key "1" (step 9 in FIG. 6).
3) As described with reference to FIG. 2 (B), standby during a call is prohibited, and the operation system control unit 40 sends the wireless system control unit 41
The standby release request during the telephone call is made (step 94 in FIG. 6).
Synthesizer 1 currently running in standby
1b, etc. (Step 9 in FIG. 6)
5).

As a result, the frequency used during the call is abandoned, and the wireless system control unit 41 notifies the operation system control unit 40 of the completion of standby release (step 9 in FIG. 6).
6) The operation system control unit 40 displays the stand-by prohibition during a call, as shown in FIG. 2 (B) 115, so that the operation system control unit 40 and the partner terminal can communicate with each other via the base station 1 / public network 43. Only the state where the telephone call is in progress (step 97 in FIG. 6). As described above, according to the present embodiment, even during a call, the standby can be easily released when the user desires by operating only the simple mobile phone B.

Next, a second embodiment of the present invention will be described. FIG. 7 shows a block diagram of a second embodiment of the mobile radio terminal according to the present invention. In the figure, the same components as those of FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. The mobile radio terminal according to the present embodiment is a simple portable telephone (PHS) C
And a wireless unit 17 for performing wireless communication with a base station (not shown) includes two synthesizers 11a and 11b,
And two transceiver units (TRX) 12a and 12b. In this embodiment, a CPU 19 performs the same operation as in the first embodiment in accordance with a control program stored in a memory 18.

In this embodiment, the synthesizer 11a
And a radio section by TRX 12a and synthesizer 11b
And the radio section by the TRX 12b can operate independently of each other, only by switching the incoming call from another party during a call by operating a function key (a so-called call waiting function), Switching to the other party in the call hold state (switching function of the other party), function to select or cancel each of the above functions with the function key (selection
The point that the cancellation function) can be realized is the same as in the first embodiment. In both the first and second embodiments, the sequence from the incoming call to the call in the state where no call is made is the same as the conventional sequence shown in FIG.

It should be noted that the present invention is not limited to the above embodiment, but can be applied to, for example, a data radio communication device other than a simple portable telephone.

[0046]

As described above, according to the present invention,
Standby is permitted by the function instruction means, and
During a call, based on an incoming call notification from another terminal,
When the call key is depressed, the call with the first partner terminal during the call is switched to the hold state and the call state with the second partner terminal having received the call is switched to the so-called call waiting function. This function is performed by the mobile radio terminal itself, instead of the base station or the communication network controlling the call waiting function as in the well-known call waiting function.Therefore, this function does not require any use procedures or payment of separate charges. Whether or not to use can be realized by a simple operation of the terminal body, and can be quickly selected. Further, since only one line is used, the cost can be reduced.

Further, according to the present invention, when the call key is pressed, the communication path with the second partner terminal, which has been in the call state, is put on hold, and the first call, which has been in the call hold state, is held. Since the call can be switched to the other terminal, the functions that can be used on the terminal itself can be further expanded as compared with the related art.

Further, according to the present invention, the standby state can be released only by operating the mobile radio terminal body while the standby state is maintained by the function instructing means, so that even during the telephone call, When it is not necessary at any time, the standby state instructed by the function instructing means can be easily released by operating the mobile radio terminal itself.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a change of a screen at the time of a function selection / release operation by a function key.

FIG. 3 is a sequence diagram for explaining the operation of FIG. 1 when an incoming call is received from another party during a call after a function is selected.

FIG. 4 is a diagram illustrating a case where a communication partner is switched after a function is selected.
3 is a sequence diagram for explaining the operation of FIG.

FIG. 5 is a sequence diagram for explaining the operation of FIG. 1 when a function is selected during a call;

FIG. 6 is a sequence diagram for explaining the operation of FIG. 1 when a function is released during a call;

FIG. 7 is a block diagram of a second embodiment of the present invention.

FIG. 8 is a block diagram of an example of the related art.

FIG. 9 is a sequence diagram for explaining an operation from an incoming call to a telephone call.

[Explanation of symbols]

 Reference Signs List 9 Liquid crystal display element (LCD) 10 Input unit (KEY) 11a, 11b Synthesizer 12a, 12b Transmitter / receiver unit (TRX) 14, 17 Radio unit 15, 18 Memory 16, 19 Central processing unit (CPU) A, B, C Simple portable Telephone (PHS)

Claims (6)

[Claims] 1. A wireless unit for performing wireless communication with a base station,
A mobile wireless terminal including one or more transmitting / receiving units and a plurality of synthesizers, wherein a function instruction unit for instructing permission or prohibition of standby during a call, a call key for permitting a call, and the function instruction unit After selecting standby permission, the second synthesizer of the plurality of synthesizers communicates with the first synthesizer of the plurality of synthesizers and one of the plurality of synthesizers during a telephone call using the transceiver unit. A standby setting unit for setting a standby state from another partner terminal using the transmitting / receiving unit or another transmitting / receiving unit; and a standby state by the standby setting unit, and during a call with the first partner terminal. Notifying means for notifying a user that there is an incoming call from a second partner terminal different from the first partner terminal, based on an incoming call notification from the second partner terminal. And when the call key is pressed, the call with the first partner terminal is switched to a hold state, and the second partner is used by using the second synthesizer and the transceiver unit or another transceiver unit. A mobile wireless terminal, comprising: first call switching means for switching to a call state with the terminal. 2. When the call key is pressed while the first party terminal is in a call holding state and the second party terminal is in a call state, the first party is depressed. 2. The mobile radio terminal according to claim 1, further comprising second call switching means for switching to a call state with the terminal and a call holding state with the second partner terminal. 3. The apparatus according to claim 2, wherein the standby setting unit is configured to permit the standby by the function instruction unit during a call with the first partner terminal using the first synthesizer and the one transmitting / receiving unit among the plurality of synthesizers. When selected, another base station that can communicate with a different base station from the calling base station is searched for using the second synthesizer and the transmitting / receiving unit or another transmitting / receiving unit among the plurality of synthesizers, and another partner terminal is searched. The mobile radio terminal according to claim 1, wherein the mobile radio terminal is set to a standby state from a terminal. 4. A communication between a first synthesizer of the plurality of synthesizers and one of the transmission / reception units in a call with a first partner terminal, and a transmission / reception with a second synthesizer of the plurality of synthesizers. And a release unit for releasing the standby state when the function instruction unit selects prohibition of standby during a call when the unit is in a standby state from another partner terminal using another unit or another transmission / reception unit. The mobile radio terminal according to claim 1, wherein: 5. The apparatus according to claim 1, wherein the function instruction unit includes a function key for determining whether or not to select a function, and a number key for indicating whether the function is enabled or disabled. 5. The mobile radio terminal according to claim 4. 6. The radio unit according to claim 1, wherein the radio unit is a radio unit of a simple portable telephone that searches for another radio base station with which communication is possible for handover during a call. A mobile wireless terminal according to claim 1.