JPH1094052A - Communication equipment, communicator and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To receive the call termination signals of both independent mode and public mode by making the slave unit of a standby state capable of simulta neously receiving control signals from a master unit and the control signals from a public base station. SOLUTION: The slave unit 21 of the standby state receives the control signals from the master unit in an antenna 25 at the time of being set to the independent mode. Then, they are converted into base band signals through a radio part 24 and a modem 23, synchronizing signals in the control signals converted into a base band are detected in a communication control part 22 and slot synchronization is performed to the public base station. On the other hand, at the time of being set to the public mode, a function for directly receiving the control signals transmitted from the public base station without interposing the master unit is provided. That is, the control signals from the public base station are received, the synchronizing signals in the control signals converted into the base band are detected in the communication control part 22 and the slot synchronization is performed to the public base station.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a communication device, a communication device, and a communication method used in a digital cordless telephone system.

[0002]

2. Description of the Related Art A communication device used in a digital cordless telephone system includes a master unit, which is a communication unit having a function as a self-managed base station for another communication unit, and another communication unit via the master unit. And a slave unit, which is a communication unit having a function of communicating with the slave unit.

[0003] In the digital cordless telephone system described above, a handset communicates with another telephone or the like connected to a public line network via a public base station. )).

[0004] Therefore, a digital cordless telephone system will be described below using PHS as an example.

[0005] First, the configuration and main functions of the PHS are described in terms of a public base station and a master unit having a function as a self-operating base station.
The configuration shown in FIG. 9 composed of a terminal having a function as a child device with respect to the above-mentioned parent device will be described as an example.

[0006] The above-mentioned public base station is a radio station installed in a public space or the like for public communication by a telecommunications carrier, and controls radio communication of terminals in a radio zone covered by the station. The public base station is connected to a public network via a wired line, and performs communication connection with another telephone or the like via the above-mentioned wired line.

The self-managed base station is a radio station installed in a home or the like as a base station for the terminal. Also,
The self-managed base station is connected to the public network via a wired line, functions as a fixed telephone, controls a terminal belonging to the own device as a slave, and communicates with other telephones and the like via the above wired line. Connection of communication of. In the following, the master unit having the function as the self-managed base station is simply referred to as a master unit.

[0008] On the other hand, in the above terminal, a PHS subscriber
It is a mobile radio station used to communicate with another communication device via a public base station or a base unit, and is a small-sized mobile phone that is small and lightweight so as to be easily carried.
This terminal device is configured to perform communication in the self-management mode via the master device near the master device such as at home, and to communicate in the public mode via the above-described public base station when away from home. . In the following, this terminal is simply referred to as a slave.

Next, the wireless communication system of the PHS will be described.
The PHS wireless communication system is a time division multiple access system (hereinafter, referred to as TDMA) in which a plurality of channels perform communication using a carrier (carrier) of the same frequency while shifting timing.
That. ). Specifically, the four channels share a carrier (carrier) of the same frequency by transmitting and receiving a call signal in sequence at a shifted timing, and are called 4-channel multiplexing TDMA. The PHS further employs a time division duplex system in which an up call (a call from a slave unit to a base unit) and a down call (a call from the base unit to a slave unit) are alternately performed using a carrier of the same frequency. Used together.

Next, a description will be given of how a call signal is transmitted and received by the TDMA method with reference to FIG. 10 by taking communication between a public base station and a slave unit as an example. In FIG.
Tx indicates transmission and Rx indicates reception.

[0011] Communication signals transmitted and received by the TDMA method are transmitted and received within a time period called a slot, which is allocated to each channel. The above-mentioned four channels from the channel CH1 to the channel CH4 are respectively allocated to the four slave units from the slave unit 1 to the slave unit 4 and used for communication. In the 4-channel multiplexing TDMA system, a basic cycle in which slots for 4 channels are transmitted and received is called a frame.

When transmitting a communication signal to a slave unit, the public base station continuously transmits communication signals for four channels.
This is called burst transmission. On the other hand, each handset from handset 1 to handset 4 transmits a call signal to the public base station using the slot assigned to each handset.

As is clear from the above description, TDMA
In the communication system of the system, when each communication device transmits and receives a call signal at a timing other than the slot allocated to the channel used by the own device, it interferes with the call signal of the other channel and cannot perform normal communication. I will. For this reason, each communication device of the TDMA system controls the transmission / reception timing of its own device in synchronization with a reference timing signal in slot units (hereinafter referred to as slot synchronization).
It is carried out.

In the PHS, a slave unit extracts a clock from a communication signal transmitted from a public base station and synchronizes with the public base station. In addition, the public base station transmits a control signal (hereinafter, referred to as a synchronization signal) serving as a reference for performing slot synchronization using a control carrier having a frequency different from that of a communication carrier for transmitting and receiving a call signal. I have. The slave unit receives the synchronization signal and performs slot synchronization with the public base station to determine the slot transmission / reception timing of the slave unit. Different frequencies are used for the control carrier in which the public base station transmits a control signal such as a synchronization signal to another communication device and the control carrier in which the parent device transmits a control signal such as a synchronization signal to the child device. The former is called a public control carrier, and the latter is called a private control carrier.

Therefore, the slave unit cannot receive the control signal transmitted from the public base station and the control signal transmitted from the master unit at the same time, and cannot use the public mode and the private mode simultaneously. could not. Therefore, conventionally, the user determines whether to use the slave unit in the public mode or the self-employment mode according to the situation, and operates and sets a switch or the like.

[0016]

As described above, the handset of the conventional digital cordless telephone system cannot receive an incoming signal in a different mode. That is, when the mobile phone is set to the self-employed mode, it receives an incoming signal in the public mode. It was unable to answer and could not respond to incoming signals in self-employed mode when set to public mode.

This is because the incoming signal is transmitted by a control carrier having a frequency different from that of the communication carrier (carrier). Further, the frequency of the control carrier transmitted by the public base station and the master unit are Because the frequencies of the control carriers to be transmitted are different from each other, the slave unit cannot switch the reception frequency and receive all of the above carriers.

The present invention has been proposed in view of such a conventional situation, and it is possible to receive an incoming signal in both the slave mode and the public mode regardless of whether the slave mode is set to the private mode or the public mode. It aims to provide a digital cordless telephone system.

[0019]

SUMMARY OF THE INVENTION A communication device of a digital cordless telephone system proposed to achieve the above object has a master unit as a communication unit having a function as a self-operating base station with respect to another communication unit; A communication device comprising a communication device having a function of communicating with the master device as a self-operating base station, the master device receiving a control signal transmitted from a public base station, and receiving the control signal. A communication control unit having a function of performing synchronization control and a function of transmitting a control signal transmitted from the public base station and a control signal for controlling the slave unit to the slave unit to the slave unit; A communication device characterized in that it has a configuration that can simultaneously receive a control signal transmitted from a public base station and a control signal transmitted from a private base station.

A communication device proposed to achieve the above object is a communication device that is a self-operating base station having a function as a master device for another communication device, and is a master device that is the self-maintaining base station. Has a function of receiving a control signal transmitted from the public base station and performing synchronization control based on the control signal, and a control signal transmitted from the public base station and a control signal for controlling the child device itself. A communication device comprising a communication control unit having a function of transmitting data to a communication device.

Another communication device proposed to achieve the above object is controlled by a master device, which is a communication device having a function as a self-operating base station with respect to the other communication devices, and communicates via the master device. A communication device having a function as a slave device that performs a control signal transmitted from the base station and a control signal transmitted from the public base station via the master device,
A communication device comprising a communication control unit having a function of performing synchronization control on a public base station and a private base station by each of the control signals.

A communication method proposed to achieve the above object is a communication device having a function as a self-operating base station for another communication device, and a function of communicating the master device as a self-operating base station. In the communication method of a communication device including a slave unit, which is a communication unit including a base unit, the base unit receives a control signal transmitted from a public base station, and performs synchronization control on the public base station by the control signal And transmits the control signal to the slave unit, and the slave unit simultaneously transmits a control signal transmitted from the master unit and a control signal transmitted from the public base station via the master unit during standby. This is a communication method characterized by receiving.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, as a specific embodiment of the present invention, an example in which the present invention is applied to a PHS will be described.

First, a master unit of a communication apparatus to which the present invention is applied will be described with reference to FIG.

The base unit 1 includes a communication control unit 2, a modem 3 connected to the communication control unit 2, a radio unit 4 connected to the modem 3, and an antenna 5 connected to the radio unit 4. ing.

Further, the base unit 1 includes a buffer 6, an audio codec unit 7, and a man-machine interface control unit 12 connected to the communication control unit 2.

A speaker 9 is connected to the audio codec unit 7 via a speaker amplifier 8, and a microphone 11 is connected via a microphone amplifier 10.

A ringer section 13 and an operation section 14 are connected to the man-machine interface control section 12 connected to the communication control section 2.

The master unit 1 further includes a wired line connection unit 15 connected to the communication control unit 2.

Next, the function and operation of each part of the master unit 1 will be described with reference to FIG. The communication control unit 2, the modem 3, the radio unit 4, the antenna 5, and the buffer 6
Is mainly used when performing wireless communication with a public base station or a slave unit (not shown).

More specifically, the communication control unit 2 receives a control signal transmitted from a public base station and performs control related to communication. For example, the communication control unit 2 converts the control signal into a baseband output from the modem 3. It has a function of synchronizing the base unit 1 with the above-mentioned public base station by using a synchronization signal in the control signal. The communication control unit 2 also has a function of receiving the synchronization signal and the incoming signal transmitted from the public base station and transmitting them to the child device.

The modem 3 connected to the communication control unit 2 modulates the communication signal digitized by the voice codec unit 7 into a signal suitable for wireless transmission, and converts the received digital communication signal into a baseband signal. It performs processing such as demodulation.

The radio unit 4 connected to the modem 3 performs amplification of control signals and communication signals transmitted and received, oscillation of carriers, and the like.

The antenna 5 connected to the radio unit 4 is for the base unit 1 to transmit and receive control signals and communication signals to and from a public base station and a slave unit.

The buffer 6 connected to the communication control unit 2
The public base station and the handset are used when transmitting and receiving a call signal via the base unit 1. The call signal transmitted from the public base station and the call signal transmitted from the handset are temporarily transmitted. Is a memory device for storing in a memory.

The audio codec 7, the speaker amplifier 8, the speaker 9, the microphone amplifier 10, and the microphone 11
It is mainly used when communication is performed by the base unit 1.

More specifically, the voice codec unit 7 performs a process such as decoding or analogization on a voice signal or the like transmitted from the communication control unit 2, and converts the processed voice signal into a speaker. Send it to the amplifier 8. Further, the audio codec unit 7 performs processing such as digitization and encoding on a communication signal transmitted from a microphone amplifier 10 described later, and transmits the processed communication signal to the communication control unit 2.

The speaker amplifier 8 includes an audio codec unit 7
Subjecting the call signal sent from to processing such as amplification,
The processed call signal is sent to the speaker 9.

The speaker 9 outputs, as voice, a call signal that has been subjected to processing such as amplification by the speaker amplifier 8.

On the other hand, the microphone 10 converts an input voice or the like into an analog call signal, and sends the call signal to the microphone amplifier 11.

The microphone amplifier 11 performs processing such as amplification on a speech signal such as voice input from the microphone 10,
The processed call signal is sent to the voice codec unit 7.

The man-machine interface control unit 12, the ringer unit 13, and the operation unit 14 are parts related to the man-machine interface of the master unit 1.

More specifically, the man-machine interface control unit 12 controls the man-machine interface of the master unit 1, and includes the ringer unit 13 and the operation unit 1.
4 and the like are controlled.

The linger unit 13 is controlled by the man-machine interface control unit 12.
When receiving an incoming signal transmitted from a public base station,
Sounds the ringtone.

The operation unit 14 serves as an interface for the user, and includes a display device using liquid crystal, LED, and the like, dial keys, and the like. In addition to the dial keys, the operation unit 14 starts and ends a call,
Alternatively, a dedicated switch, a key, and the like used for mode switching for an additional function are provided. The operation unit 14 is used, for example, when the user inputs a telephone number of a called party to make a call from the base unit 1.

The wired line connection unit 15 is for connecting the base unit 1 to a wired public line network, and is used when performing wired communication with another telephone or the like via the above public line network. used.

When receiving a control signal transmitted from the public base station, master device 1 first receives a control signal transmitted from the public base station by antenna 5. Next, the control signal received by the antenna 5 is subjected to processing such as amplification by the radio unit 4 and is subjected to processing such as demodulation by the modem 3 to be converted into baseband.
Then, the communication control unit 2 detects, for example, a synchronization signal in the control signal converted into the baseband, and performs slot synchronization with the public base station using the synchronization signal. Thereby, base unit 1 can receive various control signals transmitted from the public base station.

Next, a slave unit of a communication apparatus to which the present invention is applied will be described with reference to FIG.

The slave unit 21 includes a communication control unit 22, a modem 23 connected to the communication control unit 22, a radio unit 24 connected to the modem 23, and an antenna 25 connected to the radio unit 24. ing.

The radio unit 24 includes a transmitting unit 24a, a receiving unit 24b, a frequency synthesizer 24c, and a duplexer 4d.
And is provided. The transmitting unit 24a and the receiving unit 24b are connected to the modem 23. Frequency synthesizer 24
c is controlled by the communication control unit 22, and the transmission unit 24a
And the receiving unit 24b.

Further, the slave unit 21 includes a buffer 26, an audio codec unit 27,
And a man-machine interface control unit 212.

The audio codec 27 is connected to a speaker 29 via a speaker amplifier 28, and a microphone 211 via a microphone amplifier 210.

The man-machine interface control unit 212 connected to the communication control unit 22 includes a ringer unit 213,
The operation unit 214 is connected.

Note that, when the user performs non-voice communication such as facsimile communication and data communication,
The data communication signal is prevented from passing through the audio codec unit 27.

The communication control unit 22, modem 23, radio unit 24, antenna 25, and buffer 26
Are mainly used when performing wireless communication with a public base station or a base unit (not shown).

More specifically, the communication control unit 22 receives a control signal transmitted from a public base station or a base unit and performs communication-related control. The function of synchronizing the slave unit 21 with the above-mentioned public base station and the master unit and the wireless unit 24 described later are controlled by the synchronization signal in the converted control signal so that the transmission / reception frequency of the slave unit 21 is changed. It has a function of performing switching control and the like. The communication control unit 22 also has a function of receiving an incoming signal and a synchronization signal transmitted from the public base station via the master unit.

The modem 23 connected to the communication control unit 22
Performs a process of appropriately modulating a digital communication signal encoded by the voice codec unit 27 for wireless communication and demodulating a received digital communication signal into a baseband signal.

The radio section 24 connected to the modem 23 performs, under the control of the communication control section 22, amplification of control signals and communication signals to be transmitted and received, oscillation of carriers, and the like.

More specifically, the transmitting section 24a mixes a high-frequency output of a predetermined transmitting frequency supplied from the frequency synthesizer 24c controlled by the communication control section 22 with a speech signal supplied from the modem 23 and transmits the mixed signal. Generate a signal,
The transmission signal is amplified and supplied to the antenna 25 via the duplexer 24d described later.

On the other hand, the receiving section 24b amplifies the high frequency received signal supplied from the antenna 25 via the duplexer 24d, and amplifies the high frequency received signal supplied from the frequency synthesizer 24c controlled by the communication control section 22. The output is mixed with an output to perform frequency conversion to an intermediate frequency or baseband.

The frequency synthesizer 24 c generates a high-frequency output under the control of the communication control unit 22. Generally, the oscillation unit has a voltage controlled oscillator (VCO)
Is used, and the oscillation frequency is controlled by a control voltage transmitted from the communication control unit.

The duplexer 24d is for sharing the antenna 25 for transmission and reception, and performs impedance matching between the antenna 25 and the transmission unit 24a and between the antenna 25 and the reception unit 24b. It also serves to block the transmission signal output from the unit 24a from flowing into the receiving unit 24b.

The antenna 25 connected to the radio unit 24
This is for transmitting and receiving a control signal and a call signal between the slave 21 and the public base station or the master.

Buffer 26 connected to communication control unit 22
Is used when transmitting / receiving a call signal between the slave unit 21 and the public base station or the base unit, and temporarily stores the call signal transmitted from the public base station or the base unit. Memory device.

The audio codec unit 27, the speaker amplifier 28, the speaker 29, the microphone amplifier 210, and the microphone 211 are mainly used when communication is performed by the slave unit 21.

More specifically, the voice codec unit 27 converts an analog call signal such as voice input from the microphone 211 via the microphone amplifier 210 into a digital call signal, and performs radio communication on the digital call signal. Or to expand a digital call signal output from the modem 23 via the communication control unit 22, decode the signal into a baseband analog call signal, and send it to the speaker amplifier 28. Specifically, the voice codec unit 27 converts an analog speech signal such as voice into a digital signal suitable for digital wireless communication by high-efficiency voice coding.

The speaker amplifier 28 performs processing such as amplification on the communication signal output from the audio codec section 27, and sends the processed communication signal to the speaker 29.
Then, the speaker 29 outputs the speech signal subjected to the processing such as amplification by the speaker amplifier 28 as sound.

Microphone 211 converts the voice or the like of the user of handset 21 into an analog call signal, and sends the call signal to microphone amplifier 210. The microphone amplifier 210 performs processing such as amplification on the call signal input from the microphone 211, and outputs the processed call signal to the audio codec unit 27.
To send to.

Further, the man-machine interface control section 212, the ringer section 213 and the operation section 214
1 related to the man-machine interface.

More specifically, the man-machine interface control section 212 controls the man-machine interface of the slave 21 and controls the operation of the ringer section 213 and the operation section 214.

The ringer unit 213 is controlled by the man-machine interface control unit 212.
Sounds an incoming call notification sound when it receives an incoming signal transmitted from the base unit.

The operation unit 214 serves as an interface for the user, and includes a display device using a liquid crystal, an LED, or the like, a dial key, and the like. In addition to the dial keys, the operation unit 214 includes dedicated switches and keys used for starting and ending a call, switching modes for ancillary functions, and the like. The operation unit 214 is used, for example, when the user inputs a telephone number of a call destination to make a call from the slave unit 21.

Next, main functions and operations of the slave unit 21 will be described with reference to FIG.

The slave unit 21 has a function of receiving a control signal transmitted from a not-shown public base station via a not-shown master unit when the self-service mode is set.

When the slave unit 21 set to the self-employed mode receives the control signal transmitted from the public base station through the master unit, the slave unit 21 receives the control signal through the antenna 25. Next, the control signal received by the antenna 25 is subjected to processing such as amplification by the radio unit 24, and the modem 2
3 to perform processing such as demodulation and convert it to a baseband signal. Then, a synchronization signal in the control signal converted to the baseband is detected, and slot synchronization is performed with respect to the above-mentioned public base station using the synchronization signal. Thus, the slave unit 21 can receive various control signals and call signals transmitted from the public base station via the master unit even when the slave unit 21 is set to the self-management mode.

Further, the slave unit 21 has a function of directly receiving a control signal transmitted from the public base station without passing through the master unit when the slave mode is set to the public mode.

When the slave unit 21 set to the public mode receives the control signal transmitted from the public base station, the slave unit 21 receives the control signal by the antenna 25. Next, the radio unit 2 responds to the control signal received by the antenna 25.
4 performs processing such as amplification, and performs processing such as demodulation by the modem 23 to convert the signal into a baseband signal. Then, a synchronization signal in the control signal converted to the baseband is detected, and slot synchronization is performed with respect to the above-mentioned public base station using the synchronization signal. Thereby, the child device 21
Can receive a control signal such as a synchronization signal or an incoming signal transmitted from a public base station.

Then, the slave unit 21 set to the public mode
Transmits / receives a call signal directly to / from a public base station without passing through a master unit.

Next, as a specific embodiment of the present invention, a communication method applied to the above-described communication device including the master unit and the slave unit will be described with reference to FIG. Note that Tx and Rx in FIG. 3 indicate transmission and reception, respectively. Hereinafter, communication between one public base station and one slave unit will be described as an example.

FIG. 3A shows the transmission / reception timing of a call signal in a conventional handset of the PHS. That is, transmission and reception of a call signal between the public base station and the slave unit
It is performed intermittently based on the TDMA system of four-channel multiplexing. Here, a conventional slot transmission / reception interval, that is, one frame is 5 ms.

On the other hand, FIG. 3B shows the transmission / reception timing of a call signal in the slave unit to which the communication method according to the present invention is applied. Here, one frame is twice as long as the conventional one, that is, 10 ms. A conventional TDMA system in which one frame is operated for 5 ms is called a full rate, and a TDM system in which one frame is operated for 10 ms, which is twice the conventional system.
The A method is called a half rate. Further, the length of the slot does not change even at the half rate.

In a conventional PHS operated at a full rate, as shown in FIG. 3A, for example, a slave unit communicating on a channel CH1 using a first slot transmits an uplink communication signal to a public base station. After transmission, the time until the communication signal transmitted from the public base station is received, that is, the number of empty slots in which no communication signal is transmitted / received is three consecutive slots. When the slave unit receives a control signal transmitted from a public base station or a master unit using the empty slot, the actually usable slot is limited to the third slot. This is because the communication signal and the control signal are transmitted by carriers having different frequencies from each other, so that the slave unit has to switch the reception frequency.

In order for the slave unit to switch the reception frequency, the oscillation frequency of the frequency synthesizer of the radio unit is usually changed based on the control of the communication control unit. Changing the oscillation frequency of this frequency synthesizer requires several hundreds of microseconds. Therefore, in order for the slave unit to switch the receiving frequency, at least one slot time is required.
In the full-rate PHS, as described above, the slot that can receive the control signal is limited to the third slot.

On the other hand, when the PHS is operated at the half rate, as shown in FIG. 3B, for example, the slave unit communicating on the channel CH1 using the first slot transmits the uplink communication signal to the public base station. The time from the reception of the call signal transmitted from the above-mentioned public base station after the transmission until the transmission is performed again at the beginning of the next frame, that is, the empty slots in which the call signal is not transmitted and received are 11 consecutive slots. Minutes. When the above slave unit receives a control signal transmitted from a public base station or a master unit using this empty slot, the available slot is two times as a time for the slave unit to perform frequency switching twice. Even if the slots are subtracted, a time T corresponding to 9 empty slots is obtained.

Therefore, at this time T, the slave unit switches the receiving frequency, receives the control signal transmitted from the public base station or the master unit by the control carrier, switches the receiving frequency again, and changes the communication carrier. Communication can be performed.

Next, examples of control slots used for transmitting and receiving the various control signals described above and examples of communication slots used for transmitting and receiving call signals will be described with reference to FIG. explain.

FIG. 4A shows an individual cell channel (SC).
CH: signaling control chan
(nel) of the control slot.

The control slot including the SCCH has 4
A transient response ramp time R of 2 bits, a start symbol SS of 2 bits, a preamble PR of 62 bits,
A 32-bit unique word UW, a 4-bit channel identification CI, a 42-bit source identification code H1, a 28-bit destination identification code H2, and a 34-bit control data I
, A 16-bit error detection parity CRC, and a 16-bit guard bit GB, for a total of 240 bits, and have a length of 625 μs. Here, the individual cell channel is a bidirectional channel for transferring information necessary for call connection between the public base station and the communication device, and the control data I is an individual cell channel.

FIG. 4B shows a broadcast channel (BCCH:
broadcastcast control channel
l) or paging channel (PCH)
2 shows a configuration of a control slot including a control slot.

The control slot including the BCCH or PCH includes a 4-bit transient response ramp time R, a 2-bit start symbol SS, a 62-bit preamble PR, a 32-bit unique word UW, and a 4-bit Channel identification CI and 42-bit calling identification code H
1, a control data I of 62 bits, a parity CRC for error detection of 16 bits, and a guard bit G of 16 bits
B and a total of 240 bits, and has a length of 625 μs. Here, the broadcast channel is a downlink one-way channel for broadcasting control information from the public base station to the communication device, and the paging channel is a system in which the same information is broadcast from the public base station to a plurality of communication devices at once. This is a downlink one-way channel to be transferred. Then, the part of the control data I becomes a broadcast channel or a paging channel.

FIG. 4C shows an information channel (TCH: tr)
2 shows a configuration of a communication slot including an affic channel.

The communication slot including the TCH includes a transient response ramp time R of 4 bits, a start symbol SS of 2 bits, a preamble PR of 6 bits, and 16 bits.
Bit unique word UW, 4-bit channel identification CI, 16-bit low-speed associated channel SA,
It is composed of a total of 240 bits including 0-bit user information TCH, 16-bit parity CRC for error detection, and 16-bit guard bit GB, and has a length of 625 μs. Here, the information channel is a bidirectional channel for transferring user information such as voice data between the public base station and the communication device, and the portion of the user information TCH is an information channel.

[0093] For example, when a public base station is notified of an incoming call from a public line network connected to the public base station to a slave unit whose location is registered in the general paging area, the paging channel for the control slot is used. An incoming signal is broadcast using PCH.

Here, when the slave unit is in the public mode, it receives the above-mentioned incoming signal directly from the public base station. On the other hand, when the slave unit is in the self-employment mode,
As described above, the synchronization signal transmitted from the public base station is received via the master unit to establish synchronization with the public base station, and the incoming information transmitted from the public base station is directly received.

That is, in the present embodiment, as described above, the base unit also receives the control carrier transmitted by the public base station and performs slot synchronization on the control signal transmitted from the public base station. The base unit also receives the incoming signal transmitted from the public base station.

Next, a description will be given of how the slave receives the above-described control signal transmitted from the public base station and the master using the empty slot obtained by the half rate conversion.

[0097] In the following description, it is assumed that the above-mentioned slave unit has been so-called publicly registered with a telecommunications carrier and can communicate in a public mode. The master unit determines that the slave unit is publicly registered and receives the public control channel. At this time, it is assumed that the slave unit has obtained the incoming call group number.

Here, the transmission of the control signal from the public base station is performed by a public control carrier of a predetermined frequency, and the transmission and reception of the control signal between the parent device and the child device are performed by the public control carrier. The control is performed by a self-control carrier having a predetermined frequency different from that of the carrier. First, a superframe transmitted by the public base station to notify various control signals to the parent device and the child device will be described with reference to FIG.

In the PHS, the public base station intermittently transmits the above-described superframe at intervals of 100 ms at 1.2-second intervals using the public control channel. Here, the super frame is a BCCH, PCH, SCCH and a user-defined control channel (USCCH).
ntrol channel), a downlink logical control channel (L
The minimum period of a CCH (logical control channel) group.

In the first slot of the superframe,
The BCCH is always transmitted in order to notify the slave unit or the like of the timing and configuration of the superframe. This BCC
H is called BCCH (A). And the child machine etc.
By receiving the BCCH (A), the start of the superframe is determined, and various control signals transmitted from the public base station are received. Then, the master unit of the transmission interval of the superframe can receive home control channel at time T ₁ of the in FIG.

Next, the procedure in which the slave unit receives an incoming signal transmitted from the public base station in the standby state will be specifically described with reference to FIG.

In order for the slave unit to be able to receive a control signal such as an incoming signal transmitted from the public base station via the master unit,
Synchronization needs to be established between the public base station and the master unit and between the master unit and the slave unit.

Therefore, the parent device transmits a home control channel to the child device using the superframe reception interval. That is, 5 × N (N = N) when a superframe transmitted from the public base station through the public control channel is received.
After 1, 2,...) Ms, the home control channel is transmitted to the slave at intervals of 5 ms. At this time, the handset also receives the above superframe, and receives its superframe 5 × N (N = 1, 2,
...) After ms, the home control channel transmitted from the master unit is received. Note that the number of slots that the master unit can transmit in one second using the home control channel is limited to eight or less.

In this way, the above-mentioned slave unit in the standby state can establish synchronization with both the public control channel and the home control channel. You can know together.

Next, transmission and reception of a control slot between the master unit and the slave unit when the PHS is operated at the half rate will be described.

First, a case where the slave unit is in a talking state in the self-management mode via the master unit will be described with reference to FIG.

[0107] The slave unit during a call in the self-employed mode can synchronize with the public control channel by the above-described procedure even when the rate is reduced to half rate. At this time, the control signal and the call signal are transmitted and received at the timing shown in FIG. That is, the master unit transmits the call signal TCH to the slave unit 5 ms after receiving the public PCH transmitted from the public base station. The slave transmits the TCH to the master 2.5 ms after the reception of the TCH. The interval at which the parent device and the child device transmit the TCH is 10 ms, which is a half-rate transmission / reception interval.

[0108] In this way, the handset during a call in the private mode can obtain the incoming call information included in the public PCH. The above-mentioned slave unit is, for example, the LE of the operation unit.
The user can be notified of the incoming call by causing D to emit light or sounding a display sound from the ringer unit.

Next, a case where the slave unit is in a talking mode in the public mode will be described with reference to FIG.

[0110] The slave unit that is talking in the public mode receives the commercial control channel transmitted by the master unit during the idle time of the talk channel TCH, using the idle slot of the talk channel generated by the half rate. At this time, since the slot timing of the TCH is specified by the link assignment message using the SCCH of the public base station, the timing at which the parent device transmits the home control channel and the timing at which the child device transmits the public TCH are one. I may do it. However, as shown in FIG. 8, the base unit transmits the self-operated control channel twice at 5 ms intervals, so that, for example, even if the home control channel a matches the public TCH, The slave unit is a home control channel b
Can be received, the above-mentioned child device can know the self-incoming call to the parent device.

The slave unit can notify the user of the incoming call by, for example, causing the LED of the operation unit to emit light or the ringer unit to emit a display sound.

Incidentally, in the communication device to which the present invention described above is applied, the number of slave units may be plural. The slave unit can transmit and receive signals to and from the public base station via the master unit, and can also directly transmit and receive signals to and from the public base station. Therefore, when the present invention is applied to a communication device having two or more slave units, if one slave unit transmits and receives signals to and from a public base station via the master unit, It is also possible to make two external line simultaneous calls.

It is needless to say that the present invention is not limited to the above example, and that the configuration and the like can be arbitrarily changed without departing from the gist of the present invention. Especially,
The present invention is not limited to the PHS, a communication device having a function as a self-operating base station for other communication devices,
It goes without saying that the present invention can be widely applied to a communication device including a master unit and a slave unit.

[0114]

According to the present invention, in a digital cordless telephone system, a handset in a standby state can receive an incoming signal in either a private mode or a public mode regardless of whether the mode is set to a private mode or a public mode. But you can receive it.

According to the present invention, when the digital cordless telephone system is operated at a half rate,
The above slave unit can receive an incoming signal in either the private mode or the public mode even during a call.

Therefore, the user of the above-mentioned slave unit must answer both the incoming call from the telephone line network connected to the base unit and the incoming call from the public base station without using the transfer telephone service or the like. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of a master unit of a communication device to which the present invention has been applied.

FIG. 2 is a block diagram illustrating a configuration example of a slave unit of a communication device to which the present invention has been applied.

FIG. 3 is a diagram illustrating slot transmission / reception timing in a slave unit.

FIG. 4 is a diagram showing a slot configuration.

FIG. 5 is a diagram showing transmission timing of a superframe by a public base station.

FIG. 6 is a diagram illustrating transmission / reception timing of a control channel in a communication device to which the present invention is applied.

FIG. 7 is a diagram showing transmission / reception timing in a self-operating mode in a communication device to which the present invention is applied.

FIG. 8 is a diagram showing transmission / reception timing in a public mode in a communication device to which the present invention is applied.

FIG. 9 is a diagram illustrating a configuration example of a PHS.

FIG. 10 is a diagram illustrating transmission / reception timing of 4-channel multiplex TDMA.

[Explanation of symbols]

1 base unit, 2,22 communication control unit, 3,23 modem, 4,24 radio unit, 5,25 antenna,
6,26 buffer, 7,27 audio codec part,
8,28 speaker amplifier, 9,29 speaker,
10,210 microphone, 11,211 microphone amplifier, 12,212 man-machine interface control unit, 13,23 ringer unit, 14,214 operation unit, 15 wired line connection unit, 21 slave unit

Claims (12)

[Claims] 1. A master unit, which is a communication unit having a function as a self-managed base station for another communication unit, and a slave unit, a communication unit having a function of communicating the master unit as a self-managed base station. In the communication device, the master unit receives a control signal transmitted from a public base station, performs a synchronization control based on the control signal, and has a control signal transmitted from the public base station and its own unit serving as a slave unit. A communication control unit having a function of transmitting a control signal to be controlled to the slave unit, wherein the slave unit simultaneously transmits a control signal transmitted from the public base station and a control signal transmitted from the self-service base station during standby. A communication device having a configuration capable of receiving. 2. The control signal is transmitted and received by a control carrier based on a time-division multiple access method during a time when a communication signal is not transmitted and received by a communication carrier, and the communication signal is transmitted and received by the communication carrier. The non-operation time is continuous for four or more slots, and the slave unit has a configuration capable of receiving a control signal in the public mode and a control signal in the self-service mode during standby and during a call. The communication device according to claim 1. 3. The public base station, the parent device serving as the private base station, and the child device use a control carrier and a communication carrier having different frequencies from each other, and use the same frequency for uplink communication and downlink communication. The communication is performed by the time division multiple access method using the communication carrier of (1).
The communication device as described. 4. A communication device that is a self-operating base station having a function as a master device for another communication device, wherein the master device that is the self-operating base station receives a control signal transmitted from a public base station, A communication control unit having a function of performing synchronization control based on the control signal and a function of transmitting a control signal transmitted from the public base station and a control signal for controlling the slave unit to the slave unit. Communication equipment. 5. The control signal is transmitted by a control carrier based on a time-division multiple access method during a time when a communication signal is not transmitted and received by a communication carrier, and the communication signal is transmitted and received by the communication carrier. 5. The communication device according to claim 4, wherein the time during which the communication is not performed is continuous over four or more slots. 6. The master unit uses a control carrier and a communication carrier having different frequencies from each other with respect to a slave unit, and uses a communication carrier of the same frequency for an uplink call and a downlink call. 5. The communication device according to claim 4, wherein communication is performed by a time division multiple access method. 7. A communication device which is controlled by a master device which is a communication device having a function as a self-managed base station with respect to another communication device and has a function as a slave device for performing communication via the master device. A function of receiving a control signal transmitted from the base unit and a control signal transmitted from the public base station via the base unit, and performing synchronization control on the public base station and the private base station based on the control signals. A communication device comprising a communication control unit having the communication device. 8. The control signal is transmitted by a control carrier based on a time division multiple access method during a time when a communication carrier does not transmit and receive a communication signal, and the communication signal is transmitted and received by the communication carrier. 8. The system according to claim 7, wherein the time during which the communication is not performed is continuous for four or more slots, and a control signal in the public mode and a control signal in the private mode can be received during standby and during a call. Communication equipment. 9. The slave unit uses a control carrier and a communication carrier having different frequencies from each other with the master unit, and uses a communication carrier having the same frequency for uplink communication and downlink communication. The communication device according to claim 7, wherein communication is performed by a time division multiple access method. 10. A master unit, which is a communication unit having a function as a self-managed base station for another communication unit, and a slave unit, which is a communication unit having a function of communicating the master unit as a self-managed base station. In the communication method of the communication device, the master unit receives a control signal transmitted from a public base station, performs synchronization control on the control signal, transmits the control signal to the slave unit, A communication method for simultaneously receiving a control signal transmitted from a public base station and a control signal transmitted from a private base station during standby. 11. The control signal is transmitted and received by a control carrier during a time when a communication signal is not transmitted and received by a communication carrier based on a time division multiple access method, and the communication signal is transmitted and received by the communication carrier. 11. The communication method according to claim 10, wherein the time during which the communication is not performed is continuous over four or more slots. 12. The master unit and the slave unit use a control carrier and a communication carrier having different frequencies from each other, and use a communication carrier having the same frequency for uplink communication and downlink communication, and perform time division. The communication method according to claim 10, wherein communication is performed by a multiple access method.