JPH10200949A - Communication equipment, communication method and repeater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a PHS(personal handy phone system) terminal to be used indoor and to make both a speech in a PHS system and a speech in a public telephone line network. SOLUTION: The repeater 4 relays a call between a PHS base station 5 and a PHS portable terminal 1. Thus, the PHS portable terminal 1 is in use even in a house 6 where a radio wave is weak. Then the repeater 4 has a function equivalent to that of a slave set 2B of a cordless telephone set 2 and an inter-conversion function of communication and voice between a PHS system and the cordless telephone set. The PHS portable terminal 1 is used to attain call transmission and call reception in a public telephone line network 3 and a speech in the public telephone line network 3 through the functions. Thus, PHS portable terminal 1 receives an incoming call in the PHS portable telephone system and an incoming call in the public telephone line network.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a PHS
(Personal Handyphon System) The present invention relates to a communication device, a communication method, and a repeater suitable for use in a system.
The present invention relates to a system in which a SHS mobile terminal can be used to make a call in a PHS system and a call in a public telephone network.

[0002]

2. Description of the Related Art PHS (Personal Handyphon System)
In the system, the output power of the mobile terminal is kept very small in order to improve the frequency use efficiency by using a micro cell and to reduce the size and weight of the device. For this reason, the PHS portable terminal may not be usable in a house where the radio wave is weakened. Therefore, a repeater has been marketed so that a PHS portable terminal can be used even in a house where radio waves are difficult to reach.

FIG. 8 shows an outline of such a repeater. In FIG. 8, 101 is a repeater,
The repeater 101 is located in a place where radio waves from a PHS base station 102 provided by using a telephone pole or a public telephone booth in the town can reach well, for example, a window 104 of a house 103.
Attached near. Reference numeral 105 denotes a PHS portable terminal, and the PHS portable terminal 105 is located in the house 103. When using repeater 101, repeater 1
01 and the PHS portable terminal 105 are registered in advance.

In a PHS system, the output power of a portable terminal is suppressed to a very small power of, for example, 10 mW or less in order to improve the frequency use efficiency and to reduce the size and weight by using a micro cell. . Therefore, P
When the HS portable terminal 105 is used in the house 103, communication between the base station 102 and the PHS portable terminal 105 may be difficult. In such a case, base station 102 and P
Communication with the HS portable terminal 105 is relayed by the repeater 101.

[0005] That is, when an incoming call is received by the PHS system, an incoming call request is sent from the base station 102. This incoming call request is received by the repeater 101. The repeater 101 interprets the incoming request, and if it finds that the incoming request is to the PHS portable terminal 105 under its control,
An incoming call request is sent to the HS portable terminal 105. When an incoming call response is returned from the PHS portable terminal 105, the incoming call response is received by the repeater 101. Upon receiving the incoming call response, the repeater 101 transmits the incoming call response to the PHS base station 102. When the connection process is completed, the base station 102 and the PH
A call is made to the S portable terminal 105 via the repeater 101. As described above, if the repeater 101 is used, the PHS portable terminal 105 can be used even in the house 103.

[0006]

By the way, many users have already installed a telephone 111 connected to a public telephone network 110 in the house 103 in addition to the PHS portable terminal 105.
have. In this case, when the user is in the house 103, a call from the public telephone network 110 and
It may receive a call from the PHS system.

Conventionally, when an incoming call is received from the public telephone network 110, the incoming call can only be received by the telephone 111,
When there is an incoming call from the PHS system, it can be received only by the PHS portable terminal 105. Therefore, it is very inconvenient to use.

When the user is in the house 103, it is convenient if the same device can receive an incoming call on the public telephone network 110 and an incoming call on the PHS system.
In particular, the PHS portable terminal 105 is small and lightweight, and has abundant functions. Therefore, when the user is in the house 103, the PHS portable terminal 105 uses the public telephone network 11
It would be very convenient if both a call from 0 and a call from the PHS system could be received.

Further, digital cordless telephones have been sold in which a PHS portable terminal can be used as a slave unit of a cordless telephone. If such a digital cordless telephone is used, the PHS portable terminal can be used as a slave unit of a telephone in a public telephone network.

FIG. 9 shows an outline of such a digital cordless telephone. In FIG. 9, 151
Is a parent device when the PHS portable terminal 153 is used as a digital cordless telephone. Master device 151 is connected to public telephone line network 152. PHS mobile terminal 15
When the PHS portable terminal 153 is used as a child device of the parent device 151 of the digital cordless telephone, the PHS portable terminal 153 is set to the self-service mode and registered in advance. The PHS portable terminal 153 is connected to the base unit 151 of the digital cordless telephone.
When registered as a child device, a digital audio signal can be transmitted and received between the PHS portable terminal 153 and the parent device 151 of the digital cordless telephone. Therefore, the PHS portable terminal 153 and the public telephone network 1
By communicating with the base unit 151 connected to the
With the PHS portable terminal 153, it is possible to make a call over the public telephone network 152.

In a digital cordless telephone using a PHS portable terminal as shown in FIG.
In addition, by having a function of alternately performing the two standby modes of the public mode and the private mode, the PHS portable terminal 153 can make a call using the public telephone network 152 or the PHS system. .

However, in such a digital cordless telephone, since base unit 151 does not have a repeater function, communication with base station 157 is difficult if base unit 151 is located in house 156 where radio waves cannot reach. Becomes PHS
Talking on the system is difficult. In addition, such a digital cordless telephone needs to alternately perform two standby operations, that is, a public mode and a private mode, so that public / private control becomes complicated and expensive. Furthermore,
The problem is that public / self-employed standby time is halved.

Therefore, an object of the present invention is to enable a portable terminal to be used indoors, and to enable both a call on a portable telephone system and a call on a public telephone network to be performed by one portable terminal. It is an object of the present invention to provide a communication device, a communication method, and a repeater that can be used.

Another object of the present invention is to use an existing cordless telephone so that a single portable terminal can perform both a telephone call in a mobile telephone system and a telephone call in a public telephone network without increasing the cost. An object of the present invention is to provide a communication device, a communication method, and a repeater that can perform the communication.

[0015]

SUMMARY OF THE INVENTION The present invention relates to a communication device comprising a terminal of a first public telephone system, a cordless telephone connected to a second public telephone system, and a repeater. A public communication control unit for controlling communication with a base station of a first public telephone system, a private communication control unit for controlling communication with a registered terminal, and a second public telephone system. A cordless telephone communication control unit for controlling communication between the cordless telephone connected to the system and a cordless telephone connected to the second public telephone system and a portable terminal of the first public telephone system; It has an interconversion processor, and relays between a base station of the first public telephone system and a terminal of the first public telephone system by a repeater, and is connected to the second public telephone system. Co And less telephone, which is a communication apparatus that relays between the terminal of the first public telephone system.

The present invention is a communication method between a terminal of a first public telephone system, a cordless telephone connected to a second public telephone system, and a repeater. Controlling communication with a base station of a public telephone system, controlling communication with a registered terminal, and controlling communication with a cordless telephone connected to a second public telephone system. And performs a mutual conversion process between the cordless telephone connected to the second public telephone system and the portable terminal of the first public telephone system,
The repeater relays between a base station of the first public telephone system and a terminal of the first public telephone system, and further includes a cordless telephone connected to the second public telephone system, and a first public telephone. This is a communication method for relaying with a terminal of the system.

According to the present invention, there is provided a public communication control unit for controlling communication with a base station of a first public telephone system, a private communication control unit for controlling communication with a registered terminal, A cordless telephone communication control unit for controlling communication between a cordless telephone connected to the second public telephone system, a cordless telephone connected to the second public telephone system, and a portable terminal of the first public telephone system Between the base station of the first public telephone system and the terminal of the first public telephone system, and is connected to the second public telephone system. This is a repeater for relaying between a cordless telephone and a terminal of a first public telephone system.

In the repeater, the relay is performed between the PHS base station and the PHS portable terminal, and the PHS portable terminal can be used even in a house where the radio wave is weakened. With this,
The repeater has a function corresponding to a slave unit of the cordless telephone, a communication between the PHS and the cordless telephone, and a mutual conversion function of voice. With these functions, it is possible to use the PHS portable terminal to make and receive calls on the public telephone network and to make calls on the public telephone network. Therefore, one P
In the HS mobile terminal, the incoming call in the PHS mobile phone system,
Incoming calls on the public telephone network can be accepted.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an example of a system to which the present invention is applied. FIG.
2, 1 is a PHS portable terminal. PHS
In the system, the output power of the portable terminal is suppressed to a very small power of, for example, 10 mW or less, in order to improve the frequency use efficiency and to reduce the size and weight by using a microcell. And in the PHS system, T
A DMA (Time Division Multiplexing) system is used, and a communication channel is set at predetermined timings (for example, 625 μsec) called time slots.

The PHS portable terminal 1 can set a public mode and a private mode. In the public mode, it is possible to widely communicate with the other party using the PHS system network. In the self-employed mode, a call can be made only to a specific partner registered in advance.

Reference numeral 2 denotes a cordless telephone. The cordless telephone 2 includes a master unit 2A and a slave unit 2B. Base unit 2A of cordless telephone 2 is connected to public telephone network 3. The cordless telephone 2 performs wireless analog voice communication between the base unit 2A and the slave unit 2B, thereby using the slave unit 2B to separate from the base unit 2A connected to the public telephone network 3. Can make a call. Further, it is possible to use the slave unit 2B to make a call or receive an incoming call from a place away from the master unit 2A.

Reference numeral 4 denotes a repeater to which the present invention is applied. The repeater 4 is attached to a place where radio waves from a PHS base station 5 provided by using a telephone pole or a public telephone box in the town can reach well, for example, near a window 7 of a house 6.

In the repeater 4 to which the present invention is applied, P
The relay between the HS base station 5 and the PHS portable terminal 1 can be performed. That is, in the PHS system, as described above, the transmission output is kept very small. For this reason, if the PHS portable terminal 1 is located in the house 6, a call may be difficult. Since the repeater 4 is installed in a place where radio waves from the PHS base station 5 can reach well, the relay between the PHS base station 5 and the PHS portable terminal 1 enables communication between the PHS base station 5 and the PHS portable terminal 1. Become.

The repeater 4 is connected to the PHS base station 5 by the PH
When used for relaying with the S mobile terminal 1, the PHS mobile terminal 1 is set to the self-employed mode, and the repeater 4
Registration with the S mobile terminal 1 is performed.

For example, with a PHS mobile phone system,
Assume that there is an incoming call to the PHS portable terminal 1. In this case, as shown in FIG. 1, a call request S1 is transmitted from the base station 5, and the call request S1 is received by the repeater 4. The repeater 4 interprets the signal from the base station 5 and
When an incoming call to the mobile terminal 1 is received, an incoming call request S2 is sent to the PHS mobile terminal 1 being served thereby. Upon receiving the incoming call, the PHS portable terminal 1 receives the incoming call and sends a response signal S3 to the repeater 4. This response signal S3 is relayed by the repeater 4 and sent to the PHS base station 5 as a response signal S4. When the incoming call processing is completed, communication is performed between the PHS base station 5 and the PHS portable terminal 1 via the repeater 4.

Further, the repeater 4 to which the present invention is applied has a function corresponding to the handset 2B of the cordless telephone 2,
It has a communication and voice mutual conversion function between the PHS system and the cordless telephone system. With this function, it is possible to use the PHS portable terminal 1 to make a call on the public telephone network 3.

For example, as shown in FIG. 2, it is assumed that there is an incoming call request S11 by the public telephone network 3. in this case,
When the base unit 2A of the cordless telephone 2 receives the incoming call request S11 from the public telephone line network 3, it transmits an incoming call request S12 for calling the handset 2B. This incoming request S12
Is received by the handset 2B of the cordless telephone 2 and the repeater 4 also has a function corresponding to the handset 2B of the cordless telephone 2, and thus is also received by the repeater 4.

When the repeater 4 receives the incoming call request S12, the repeater 4 sends the incoming call request S12 to the PHS portable terminal 1 under its control.
Into the incoming call request S13, and sends out the incoming call request S13. PHS portable terminal 1 that has received the incoming call request S13
Sends a response signal S14 to the repeater 4.
This response signal S14 is converted into a response signal S15 in the cordless telephone system by the repeater 4, and sent to the base unit 2A of the cordless telephone 2. As a result, a call can be made between the PHS portable terminal 1 and the base unit 2A of the cordless telephone 2 connected to the public telephone network 3 via the repeater 4.

Then, communication is performed via the repeater 4 between the PHS portable terminal 1 and the base unit 2A of the cordless telephone 2. At this time, conversion between the PHS time-division multiplexing process and the analog voice communication process of the cordless telephone is performed by the repeater 4, and the repeater 4 is transmitted between the PHS portable terminal 1 and the base unit 2A of the cordless telephone 2. Calls can be made via

As described above, in this system, the repeater 4 has a function corresponding to the slave unit 2B of the cordless telephone 2, and
A communication and voice mutual conversion function between the PHS system and the cordless telephone is provided. Therefore, the PHS portable terminal 1 can accept an incoming call in the PHS system and an incoming call in the public telephone network 3. Therefore,
When used in the house 6, the user only needs to carry the PHS portable terminal 1 alone.

The PHS portable terminal 1 is often smaller, lighter and more sophisticated than the cordless telephone handset 2B. Therefore, it is considered that the operability is improved by using the PHS portable terminal 1 rather than using the handset 2B even when making a call using the public telephone network 3.

Note that, in principle, the outgoing call is PH
Using the S portable terminal 1, a call can be made to the PHS system and to the public telephone network 3. However, in an environment where the public telephone network 3 can be used, the public telephone network 3 is generally considered to be cheaper in usage fee and to perform stable communication. Therefore, it is conceivable to set priorities for outgoing calls so that outgoing calls in the public telephone network 3 have higher priorities than outgoing calls in the PHS system.

In the above example, the same PHS portable terminal 1 accepts both the incoming call from the PHS portable telephone system and the incoming call from the public telephone network 3. Therefore, P
When a call is made to the HS portable terminal 1, the call is made from the PHS portable telephone system or the public telephone network 3
If you don't know if it's a call from, it will confuse the user. So, whether it is an incoming call in the PHS system,
The ringing tone generated from the PHS portable terminal 1 may be changed according to whether the incoming call is on the public telephone network 3.

Further, in the above example, one PHS portable terminal 1 is relayed by the repeater 4 to the base unit 2A of one cordless telephone, but two or more PHS portable terminals are registered in the repeater 4. If you leave it, multiple PHS
Incoming calls to mobile terminals and extension transfers are possible.

Next, each configuration of the PHS portable terminal 1, the cordless telephone 2, and the repeater 4 will be described.

FIG. 3 shows the configuration of the PHS portable terminal 1. In FIG. 3, when transmitting, the microphone 1
1 is supplied to the A / D converter 12. The input audio signal is digitized by the A / D converter 12. The output of the A / D converter 12 is supplied to the audio signal processing circuit 13. In the audio signal processing circuit 13,
This digital audio signal is encoded by, for example, DPCM.

The output of the audio signal processing circuit 13 is sent to a multiplexing circuit 14. The multiplexing circuit 14 performs time-division multiplexing control so that the transmission data is compressed on the time axis and transmitted in slots at a predetermined timing. Multiplexing circuit 1
4 is controlled by a public communication controller 15 and a private communication controller 16. Public communication controller 15
Performs time-division control in the public mode. The self-management mode controller 16 performs time-sharing control in the self-management mode.

The output of the multiplexing circuit 14 is sent to a data processing circuit 17. The baseband signal from the time division multiplexing circuit 14 is modulated by the data processing circuit 17. The output of the data processing circuit 17 is supplied to the high frequency circuit 18. The transmission signal is converted to a carrier frequency of a predetermined channel by the high frequency circuit 18, power-amplified, and output from the antenna 19.

At the time of reception, the signal received by the antenna 19 is
It is supplied to the high frequency circuit 18. By the high frequency circuit 18,
The received signal is converted to an intermediate frequency signal. High frequency circuit 18
Is supplied to the data processing circuit 17. The data processing circuit 17 demodulates the baseband signal.

The output of the data processing circuit 17 is the multiplexing circuit 1
4 is supplied. The multiplexing circuit 14 extracts data of a predetermined data stream from the time-division multiplexed data transmitted.

The output of the multiplexing circuit 14 is sent to the audio signal processing circuit 13. The audio signal processing circuit 13 decodes the audio signal. The output of the audio signal processing circuit 13 is D
/ A converter 20. D / A converter 2
By 0, a digital audio signal is converted to an analog audio signal. This audio signal is output from the speaker 21.

FIG. 4 shows the structure of the base unit 2A of the cordless telephone 2. In FIG. 4, the controller 3
1 is connected to the public telephone network 3 via a line interface 32. This line interface 3
2, the transmission and the reception are controlled under the control of the controller 31.

At the time of transmission to the handset 2 B, the voice signal from the other party from the public telephone network 3 is supplied to the modulation / demodulation circuit 33. This audio signal is FM-modulated by the modulation / demodulation circuit 33. This signal is supplied to the high frequency circuit 34, converted into a predetermined frequency, and transmitted from the antenna 35.

At the time of receiving a signal from the handset 2B, the signal is received by the antenna 35, and the received signal is
4 is supplied. In the high frequency circuit 34, the received signal is converted into a predetermined intermediate frequency signal. The output of the high frequency circuit 34 is supplied to the modulation / demodulation circuit 33. In the modulation / demodulation circuit 33, the received signal is FM-demodulated, and an analog audio signal is output. This audio signal is sent to the public telephone network 3 via the line interface 32.

FIG. 5 shows the configuration of the slave unit 2B of the cordless telephone 2. In FIG. 5, when a signal from master device 2A is received, a signal from master device 2A is transmitted to antenna 41A.
Received at. The reception output of the antenna 41 is supplied to the high frequency circuit 42. In the high frequency circuit 42, the received signal is converted into a predetermined intermediate frequency signal. This received signal is supplied to the modulation / demodulation circuit 43. When the received signal is F
M demodulation is performed, and an analog audio signal is output from the other party. This audio signal is supplied to the speaker 44.

At the time of transmitting a signal to the master unit 2A, the audio signal from the microphone 46 is supplied to the modulation / demodulation circuit 43. In the modulation / demodulation circuit 43, the audio signal is FM-modulated. The output of the modulation / demodulation circuit 43 is supplied to the high frequency circuit 42. In the high frequency circuit 42, this signal is converted into a predetermined frequency,
It is transmitted from the antenna 41.

FIG. 6 shows the structure of the repeater 4. In FIG. 6, reference numeral 51 denotes an antenna for relaying in the PHS system. When relaying between the PHS base station 5 and the PHS mobile terminal 1, the antenna 51
Transmission and reception of signals with the PHS base station 5 or the PHS portable terminal 1 are performed.

The reception output of the antenna 51 is
2 is supplied. In the high frequency circuit 52, the received signal is converted into a predetermined intermediate frequency signal. The output of the high frequency circuit 52 is supplied to the data processing circuit 53. Data processing circuit 53
Then, the baseband signal is demodulated. Data processing circuit 5
3 is supplied to the multiplexing circuit 54.

The multiplexing circuit 54 includes the public controller 6
0, controlled by a self-managed controller 61 and a cordless telephone controller 62. A communication process with the PHS base station 5 is performed by the public controller 60, and a communication process with the PHS mobile terminal 1 is performed by the private controller 61.
The cordless telephone controller 62 performs communication processing with the base unit 2A of the cordless telephone.

The transmission data from the multiplexing circuit 54 is supplied to the data processing circuit 53. In the data processing circuit 53,
Modulation is performed on the baseband data. The output of the data processing circuit 53 is supplied to the high frequency circuit 52.
The output of the high frequency circuit 52 is output from the antenna 51.

Reference numeral 55 denotes an antenna for receiving a signal from the base unit 2A of the cordless telephone 2. When relaying between the base unit 2A of the cordless telephone 20 and the PHS portable terminal 1, the antenna 55
The transmission / reception of the signal to / from the master unit 2A is performed.

The reception output of the antenna 55 is
6. In the high frequency circuit 56, the received signal is converted into a predetermined intermediate frequency signal. The output of the high frequency circuit 56 is
The signal is supplied to the modulation / demodulation circuit 57. The modulation / demodulation circuit 57 demodulates the audio signal from the base unit 2A of the cordless telephone 2. The demodulated audio signal is supplied to a multiplexing circuit 54 via an A / D and D / A conversion circuit 58 and an audio processing circuit 59.

The output of the multiplexing circuit 54 is supplied to an audio signal processing circuit 59. In the audio signal processing circuit 59, the audio data is decoded. This audio data is A / D and D
The signal is converted into an analog signal by the / A conversion circuit 58, sent to the modulation circuit 57, and FM-modulated. The output of the modulation / demodulation circuit 57 is supplied to the high frequency circuit 56. In the high frequency circuit 56, the transmission signal is converted into a predetermined carrier frequency, and this signal is output from the antenna 55.

When the signal from the PHS base station 5 is relayed by the repeater 4 and sent to the PHS portable terminal 1, the antenna 5
1 receives a signal from the PHS base station 5,
The baseband data from the base station 5 is transmitted to the data processing circuit 5
3 demodulated. Then, the output of the data processing circuit 53 is supplied to the multiplexing circuit 54. The time slot is controlled by the multiplexing circuit 54, and this data is supplied to the data processing circuit 53 again. The data processing circuit 53 modulates the baseband data. The output of the data processing circuit 53 is supplied to the high frequency circuit 52. The output of the high-frequency circuit 52 is output from the antenna 51, and this signal is sent to the PHS portable terminal 1.

The signal from the PHS portable terminal 1 is transmitted to the repeater 4
When transmitting to the PHS base station 5 by relaying with
1, a signal from the PHS portable terminal 1 is received.
The baseband data from the S portable terminal 1 is demodulated by the data processing circuit 53. Then, the output of the data processing circuit 53 is supplied to the multiplexing circuit 54. In the multiplexing circuit 54,
The time slot is controlled, and this data is supplied to the data processing circuit 53 again. The data processing circuit 53 modulates the baseband data. The output of the data processing circuit 53 is supplied to the high frequency circuit 52. The output of the high frequency circuit 52 is output from the antenna 51, and this signal is sent to the PHS base station 5.

As described above, when relaying between the PHS base station 5 and the PHS portable terminal 1, the public controller 60
, The communication process with the PHS base station 5 is performed, and the self-managed controller 61 performs the communication process with the PHS mobile terminal 1. In this case, different time slots are used for communication between the PHS base station 5 and the repeater 4 and for communication between the repeater 4 and the PHS portable terminal 1.

7A shows the transmission and reception timing of the PHS base station 5, FIG. 7B shows the transmission and reception timing of the repeater 4, and FIG. 7C shows the PHS portable terminal 1.
1 shows the timing of transmission and reception of the data.

As shown in FIGS. 7A and 7B, in the communication between the PHS base station 5 and the repeater 4, when transmission and reception are performed at the timings indicated by T1 and R1 in the PHS base station 5 (FIG. 7A). ), The repeater 4 performs reception and transmission at the timing indicated by R11 and T11 of the corresponding time slot (FIG. 7B).

Then, as shown in FIGS. 7B and 7C,
In communication between the repeater 4 and the PHS base station 5, the repeater 4
Then, transmission and reception to the PHS portable terminal 1 are performed at timings indicated by T21 and R21 (FIG. 7B).
At 31, reception and transmission are performed (FIG. 7C).

As described above, the PHS base station 5 and the repeater 4
Different time slots are used for communication between the repeater 4 and the PHS base station 5. Therefore, the same frequency can be relayed, and the PHS base station 5
Communication between the repeater 4 and the repeater 4 and the PHS base station 5
High-frequency circuit 52 and data processing circuit 53
Can be shared.

When the signal from the base unit 2A of the cordless telephone 2 is relayed by the repeater 4 and sent to the PHS portable terminal 1, the signal from the base unit 2A of the cordless telephone 2 is received by the antenna 55. This signal is sent to the modulation / demodulation circuit 57 and demodulated. The demodulated output is converted into a digital signal by an A / D and D / A converter 58, encoded by an audio signal processing circuit 59, and supplied to a multiplexing circuit 54. The multiplexing circuit 54 controls the time slot. The output of the multiplexing circuit 54 is supplied with data to the data processing circuit 53, and the baseband data is modulated. The output of the data processing circuit 53 is supplied to the high frequency circuit 52 and sent from the antenna 51 to the PHS portable terminal 1.

The signal from the PHS portable terminal 1 is transmitted to the repeater 4
, The signal of the PHS portable terminal 1 is received by the antenna 51, and the baseband signal is demodulated by the data processing circuit 53. The output of the data processing circuit 53 is supplied to the multiplexing circuit 54. In the multiplexing circuit 54, data from the PHS portable terminal 1 is taken out, and this data is sent to the audio signal processing circuit 59.
Sent to In the audio signal processing circuit 59, the audio data is decoded. This audio data is converted into an analog signal by an A / D and D / A conversion circuit 58,
Is FM-modulated. The output of the modulation / demodulation circuit 57 is sent to the high frequency circuit 56, converted into a predetermined carrier frequency, and sent from the antenna 51 to the base unit 2A of the cordless telephone 2.

[0063]

According to the present invention, in the repeater, PH
The relay between the S base station and the PHS portable terminal is performed, and the PHS portable terminal can be used even in a house where the radio wave is weak, and the repeater has a function equivalent to a cordless telephone handset, and a PHS and a cordless telephone. It has a communication and voice mutual conversion function. With these functions, PHS
Using a portable terminal, it is possible to make and receive calls on a public telephone network and to make calls on the public telephone network. Therefore, one PHS portable terminal can accept an incoming call on the PHS mobile phone system and an incoming call on the public telephone network 3.

[Brief description of the drawings]

FIG. 1 is a schematic diagram used for describing an example of a communication system to which the present invention is applied.

FIG. 2 is a schematic diagram used for explaining an example of a communication system to which the present invention is applied;

FIG. 3 shows P in a communication system to which the present invention is applied;
It is a block diagram of an example of an HS portable terminal.

FIG. 4 is a block diagram of an example of a base unit of the cordless telephone in the communication system to which the present invention is applied.

FIG. 5 is a block diagram of an example of a cordless telephone handset in a communication system to which the present invention is applied.

FIG. 6 is a block diagram illustrating an example of a repeater in a communication system to which the present invention has been applied.

FIG. 7 is a timing chart used for describing an example of a repeater in a communication system to which the present invention has been applied.

FIG. 8 is a schematic diagram used for describing an example of a conventional repeater.

FIG. 9 is a schematic diagram used for describing an example of a conventional digital cordless telephone.

[Explanation of symbols]

1 ・ ・ ・ PHS portable terminal, 2 ・ ・ ・ Cordless telephone,
3 ... public telephone network, 4 ... repeater, 5 ...
base station

Claims (9)

[Claims] A first public telephone system terminal; a second public telephone system terminal;
A communication device comprising a cordless telephone connected to the public telephone system of claim 1 and a repeater, wherein the repeater controls communication between the base station of the first public telephone system and the public communication control. Unit, a private communication control unit for controlling communication between registered terminals, and a cordless telephone communication control unit for controlling communication between the cordless telephone connected to the second public telephone system. A cordless telephone connected to the second public telephone system and a portable terminal of the first public telephone system, and a mutual conversion processing unit. A cordless telephone connected to the second public telephone system and a base station of the system and a terminal of the first public telephone system; Communication apparatus that relays between the arm of the terminal. 2. The communication system according to claim 1, wherein the repeater performs communication with the base station of the first public telephone system and communication with the registered terminal in a time division multiplexing manner. The communication device as described. 3. The communication device according to claim 1, wherein the repeater communicates with a cordless telephone connected to the second public telephone system by an analog signal. 4. The repeater further relays between a cordless telephone connected to the second public telephone system and two or more terminals of the first public telephone system. 2. The communication device according to 1. 5. A terminal for a first public telephone system,
A communication method between a cordless telephone connected to a public telephone system and a repeater, wherein the repeater controls communication between a base station of the first public telephone system and registration. Controlling the communication with the terminal, the communication with the cordless telephone connected to the second public telephone system, and controlling the communication with the cordless telephone connected to the second public telephone system. A mutual conversion process is performed between a telephone and the portable terminal of the first public telephone system, and the repeater is used to connect the base station of the first public telephone system to the terminal of the first public telephone system. A communication method for performing relaying and relaying between a cordless telephone connected to the second public telephone system and a terminal of the first public telephone system. 6. The repeater according to claim 5, wherein the communication with the base station of the first public telephone system and the communication with the registered terminal are performed in a time-division multiplexing manner. The communication method described. 7. The communication method according to claim 5, wherein said repeater communicates with a cordless telephone connected to said second public telephone system by an analog signal. 8. The repeater further relays between a cordless telephone connected to the second public telephone system and two or more terminals of the first public telephone system. 5. The communication method according to 5. 9. A public communication control unit for controlling communication with a base station of a first public telephone system; a private communication control unit for controlling communication with a registered terminal; A cordless telephone communication control unit for controlling communication with a cordless telephone connected to the public telephone system; a cordless telephone connected to the second public telephone system; and a portable terminal of the first public telephone system And a relay unit between the base station of the first public telephone system and the terminal of the first public telephone system.
A relay device configured to relay between a cordless telephone connected to the public telephone system of the first aspect and a terminal of the first public telephone system.