JP2000165520A - Catch-phone(r) system and mobile terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To executes a catch-phone (call waiting) service to a personal handy phone system PHS without revision of a base station and a service network side. SOLUTION: A control section 1 of a mobile terminal during a speech uses a radio section 8 to transit an incoming call to a communication state when a radio section 2 receives an incoming call notice signal. When the control section 1 receives a setup notice of the communication state from the radio section 3, the control section 1 controls an operation section 4 to use a speaker 5 or the like to inform the user of the mobile terminal about the arrival of the incoming call. In the speech state incoming call, the user applies a prescribed key operation of the operation section 4 to hold a call having been busy by the radio section 2 and replies the call received by the radio section 3, a holding tone or a melody is given to the opposite party having been busy before to inform the opposite party about holding of the call. Thus, a 1st speech call communicated so far the radio section 2 is held in the mobile terminal and the incoming call by the radio section is busy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call waiting (registered trademark) system and a mobile terminal. The present invention relates to a call waiting system for notifying and a mobile terminal used for the system.

[0002]

2. Description of the Related Art Conventionally, when a telephone exchange notifies a caller of another party during a call, the other party is informed that a caller has been verbally picked up, and the caller has been called. A call waiting service is known in which a telephone is put on hold without off-hook so that a call can be transferred to another party who has made a call later (for example, Japanese Patent Application Laid-Open No. 4-220850, Japanese Utility Model Application Laid-Open No. No. 4-48747).

[0003]

However, the above-mentioned call waiting service has been implemented for a wired fixed telephone or a portable telephone, and a PHS (Person)
al Handyphone System) has not heretofore been implemented. Here, PHS is 1
Multiple mobile base stations (slave units) can access multiple wireless base stations (master units), so by installing the master unit outdoors, the mobile terminals can be used as mobile phones. The mobile terminal can be used as a system cordless telephone by installing it in a room, and the mobile terminal can be used as a digital cordless telephone by installing a base unit indoors.

Since such a PHS is configured without considering the above-described call waiting service, a call waiting service using the current system is not limited to the mobile terminal as well as the base station and the service. You have to change the network side,
Not realistic.

[0005] The present invention has been made in view of the above points,
An object of the present invention is to provide a call waiting system and a mobile terminal capable of performing a call waiting service for a PHS without changing a base station and a service network side.

[0006]

In order to achieve the above object, a call waiting system of the present invention uses a time-division slot to communicate with one mobile terminal and a network via a plurality of base stations. A call waiting system for performing a call, wherein the network has a means for notifying the calling mobile terminal of an incoming call via a base station using a different slot when the incoming call arrives at the calling mobile terminal. A mobile terminal that is performing wireless communication with the base station and receives a signal notifying of an incoming call; a second wireless unit that can perform wireless communication independently of the first wireless unit; Control means for establishing a communication state with a call received by the second wireless unit by inputting a signal for notifying an incoming call via the first wireless unit is provided.

According to the present invention, when an incoming call is received by a mobile terminal that is in a call, the call that is currently in a call is held through the control means, and the call that has been received can be switched to a call state.

In order to achieve the above object, a mobile terminal according to the present invention is a mobile terminal that communicates with a plurality of base stations using time-divided slots. Possible first and second radio units,
And control means for establishing another communication state with respect to the other of the first and second radio units when one of the first and second radio units is performing radio communication with the base station. It was done.

The above-mentioned slots are assigned one slot each for transmission and reception as a pair.
Is characterized in that two pairs of communication slots are allocated to the radio section. According to the present invention, when a data transmission request is input during a call, data communication can be performed in parallel with the voice call using the other wireless unit.

[0010]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of an embodiment of a mobile terminal according to the present invention. In FIG. 1, a mobile terminal is a control unit 1 that controls the operation of each unit of the terminal.
And a first wireless unit 2 and a second wireless unit 3 capable of wireless communication independently with each other with a master unit (not shown), various input keys and their input units, audio output units, vibrator driving units, An operation unit 4 including an LED driving unit, a speaker 5, a vibrator 6, a light emitting diode (LED) 7, a display unit 8, and an adapter 9 connected to the operation unit 4 are provided.

The control unit 1 controls the radio units 2 and 3 and manages the protocol of the radio signal, and notifies the operation unit 4 of the radio status. Also, it controls the wireless units 2 and 3 in response to a request from the operation unit 4. Radio units 2 and 3
Transmits / receives signals to / from a base station (base station), receives an incoming signal during a call, transmits an outgoing signal, and the like. Where P
In the HS, each of the radio units 2 and 3 uses one communication slot for transmission and reception according to the time division multiple access system (TDMA). Therefore, in this embodiment, a total of four communication slots can be used.

The operation unit 4 controls the sound of the speaker 5, the vibration of the vibrator 6, the turning on / off of the LED 7, and the like in accordance with a signal from the control unit 1, and also controls the display unit 8 for displaying the state of the terminal. . The adapter 9 receives data from an external device having a data transmission / reception function, such as a personal computer (PC), and sends the data to the PC.

FIG. 2 shows a system configuration diagram of an embodiment of the call waiting system according to the present invention. In this call waiting system, mobile terminals A and B having the configuration shown in FIG. 1 are, for example, separately performing wireless communication with base stations 12 and 13 serving as masters, respectively. Standard PIAFS (PHS
Interface Access Forum System)
And can transmit and receive data. Also,
Each of the base stations 12 and 13 is connected to a telephone network 14, to which a general telephone 15 is also connected. Although there are usually a plurality of general telephones 15, only one is shown here for convenience of illustration.

Although the system configuration itself of FIG. 2 is conventionally known, the present invention allows the mobile terminals A and B to correspond to the block diagram of FIG. 1 without changing most of the conventionally known call waiting system. There is a feature in the configuration.

Next, this embodiment will be described in detail with reference to the flowcharts of FIGS. 1, 2 and 3 and the signal format diagram of FIG.

In a state where the mobile terminal is in a call using the first wireless unit 2 of FIG. 1 (step 10 in FIG. 3).
1) When a mobile terminal receiving the call receives an incoming call, a busy tone is transmitted to the terminal originating on the network side.
SACCH (Slow Access Control) is transmitted from the network side to the called mobile terminal having this function through the base station.
Channel) signal to notify you of an incoming call.

FIG. 4A shows a SAC for notifying the incoming call.
An example of a CH signal format is shown. As shown in the figure, 1-bit slot order bit 21, 15-bit information field 22, 1-bit slot order bit 2
It consists of an information field 24 of 3, 15 bits. In the information fields 22 and 24, as shown in FIG.
An incoming signal such as a protocol identifier, a call number, and a message type is arranged to notify the incoming call.

The mobile terminal during a call receives the above-mentioned incoming notification signal of the SACCH by the first radio unit 2 and supplies the control unit 1 that there is an incoming call during the call. The control unit 1 includes a first
When the above-mentioned incoming call notification signal is input from the wireless unit 2 of the above, the call that has been received using the second wireless unit 3 is transited to the communication state. The second wireless unit 3 establishes a communication state according to an instruction from the control unit 1, and notifies the control unit 1 that the communication state has been established (step 102 in FIG. 3).

When the control unit 1 receives the communication status establishment notification from the second wireless unit 3, it controls the operation unit 4 to make the speaker 5 ring, the vibrator 6 to vibrate,
The LED 7 is turned on to notify the user of the mobile terminal of the incoming call (step 102 in FIG. 3). By the notification of the incoming call by the speaker 5, the vibrator 6 or the LED 7,
The user knows the incoming call during the call, and the mobile terminal enters the incoming call state during the call (step 103 in FIG. 3). At this time, it is possible to use a tone or a display to notify who has received the call.

In this incoming call receiving state, the user performs a predetermined key operation on the operation unit 4 to hold the call which was previously in the first wireless unit 2 and the second wireless unit 3.
In response to the incoming call, the callee is notified of the hold tone or the melody to notify the other party who was previously talking (step 104 in FIG. 3).
As a result, the mobile terminal puts the first call using the first wireless unit 2 up to that point on hold, and the incoming call (second call) on the second wireless unit 3 becomes busy (FIG. 3). Step 1 of
05).

In this state, if the user operates the off key of the operation unit 4, the call in the current call state (in this case, the second call) is disconnected, and the other call (in this case, the first call).
Is set to a call state (steps 106 and 101 in FIG. 3).
In this call state, when another incoming call is received, the same operation as described above is performed again.

On the other hand, during the first call holding in step 105,
When the user operates the switching key of the operation unit 4 during the second call, the control unit 1 switches the call in the call state to the hold state and the wireless unit 2 to switch the call in the hold state to the call state. And 3 (Step 10 in FIG. 3)
7). As a result, the first call and the second call are put on hold (step 108 in FIG. 3).

In this state, when the user operates the switching key of the operation unit 4 again, the control unit 1 switches the call in the talking state to the hold state, and switches the call in the hold state to the talking state so that the radio unit 2 and the wireless unit 2 operate. 3 (Step 1 in FIG. 3)
07). As a result, the first call is put on hold and the second call is made (step 105 in FIG. 3). If the user presses the off key of the operation unit 4 during the first call and the second call on hold in step 108, the call on the call is terminated, and the other call on hold is called. Return to the state (steps 106 and 101 in FIG. 3).

When a new incoming call is received again in this case, the communication is being performed by the second wireless unit 3 at that time, and the control unit 1 receives the incoming call from the second wireless unit 3. The notification signal is input, and the call that has been received using the first wireless unit 2 is changed to the communication state (step 10 in FIG. 3).
2).

As described above, according to the present embodiment, PH
By using two communication slots for incoming calls during S, an alarm sound or
The user can be notified by using a vibrator or the like, and a call in progress can be held by a key operation by the user, and an incoming call can be put into a call state.

Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a flowchart for explaining the operation of another embodiment of the present invention. The same reference numerals are given to the same processing steps as in FIG. 3, and the description thereof will be omitted. In this embodiment, data communication at a transfer rate of, for example, 32 kbps can be performed in addition to the above-described voice transmission (call).

The operation of this embodiment will be described.
The personal computer 11 or the PDA like the mobile terminal A in FIG.
When the mobile terminal connected to is in a call (step 201 in FIG. 5), when the voice call is notified, the call of the first wireless unit 2 currently used for the call is held, and The second wireless unit 3 in use is set to a call state (FIG. 5).
Step 202).

As a result, the mobile terminal enters the calling state during a call (step 203 in FIG. 5), and when the other party answers, the second radio unit 3 is kept on hold while the call of the first radio unit 2 is on hold. The call from the partner device made via the telephone is placed in a call state (step 204 in FIG. 5). Thus, the first call is on hold and the second call is on call (step 10 in FIG. 5).
5). The following is the same as the processing of FIG.

Next, an operation when a data transmission request is made from a personal computer or a PDA connected to a mobile terminal during a call will be described. In this case, the transmission request from the personal computer or the PDA is received by the adapter 9 of FIG. 1 and is notified to the control unit 1 through the operation unit 4. As a result, the control unit 1 keeps the communication state of the first wireless unit 2 as it is, and puts the second wireless unit 3 into the data communication state without holding (see FIG. 5).
Step 208). As a result, the mobile terminal operates in parallel with the call state using the first wireless unit 2 and the second wireless unit 3
(Step 20 in FIG. 5).
9).

The signal for which data communication has been established is transmitted to the second radio unit 3
Is received, the call of the first wireless unit 2 is kept in a call state,
The call of the second wireless unit 3 is set to the data communication state (step 210 in FIG. 5), the control unit 1 notifies the adapter 9 via the operation unit 4 of the establishment of data communication, and the network side is connected via the second wireless unit 3. PC or PD that requested data transmission with other party
A data communication is performed with A, and a voice call is subsequently performed with the network partner via the first wireless unit 2 (FIG. 5).
Step 211).

In the above state, when the user presses the cut-off key of the operation unit 4, the control unit 1 notifies the network side through the first wireless unit 2, and the call during the voice call ends in a predetermined sequence. , Data communication state (step 21 in FIG. 5)
2). On the other hand, the PC or PD that made the data transmission request
When the disconnection request is received from A, the control unit 1 notifies the network side via the second wireless unit 3 to terminate the data communication in a predetermined sequence and enter a voice communication state (step 2 in FIG. 5).
13).

As described above, in this embodiment, the PHS
, A call waiting service can be realized, and a data transmission / reception service can also be realized. Although the data communication has been described in the above embodiment, another voice can be transmitted during a call in the same manner as described above instead of the data communication.

[0033]

As described above, according to the present invention,
When an incoming call is received by a mobile terminal during a call, the current call can be put on hold through the control means and the incoming call can be switched to a call state.
The call waiting service that could not be realized can be easily realized without changing existing base stations and networks used in PHS.

According to the present invention, when a data transmission request is input during a call, the other of the two radio units that is not used for the call can be used for data communication. , Data communication can be performed in parallel, and another voice transmission can be performed instead of the data communication.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a mobile terminal according to the present invention.

FIG. 2 is a system configuration diagram of one embodiment of a call waiting system of the present invention.

FIG. 3 is a flowchart for explaining the operation of the embodiment of the present invention.

FIG. 4 is a diagram illustrating an example of a signal format of a SACCH for notifying an incoming call during a call;

FIG. 5 is a flowchart for explaining the operation of another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 control unit 2 first wireless unit 3 second wireless unit 4 operation unit 5 speaker 6 vibrator 7 light emitting diode (LED) 8 display unit 9 adapter 11 personal computer (PC) 12, 13 base station 14 telephone network A, B mobile terminal

Claims (3)

[Claims] 1. A call waiting (registered trademark) system for performing communication between one mobile terminal and a network via a plurality of base stations using time-divided slots, wherein the network is configured to perform the communication during a call. When there is an incoming call to the mobile terminal, the mobile terminal has a means for notifying the incoming call via the base station using a different slot for the mobile terminal that is talking, the mobile terminal and the base station A first wireless unit that is in wireless communication and receives the signal notifying the incoming call;
A second wireless unit capable of wireless communication independently of the wireless unit, and a signal for notifying of the incoming call being input via the first wireless unit. A call waiting system comprising: a control unit that establishes a communication state with a call. 2. A mobile terminal that communicates with a plurality of base stations using time-divided slots, comprising: a first and a second wireless unit capable of wirelessly communicating with the base station independently of each other; Control means for establishing another communication state with the other of the first and second wireless units when one of the first and second wireless units is performing wireless communication with the base station. A mobile terminal, comprising: 3. The communication system according to claim 2, wherein the slots are assigned one slot each for transmission and reception, and two pairs of communication slots are assigned to the first and second radio units. Item 3. The mobile terminal according to Item 2.