JPH08336179A - Digital cordless telephone system - Google Patents

Abstract

PURPOSE: To provide a digital cordless telephone system in which operability is improved at low cost. CONSTITUTION: An originating call operation means performs an originating call operation to a designated tranmission destination. A control part 7 detects whether the originating call operation to the transmission destination in the originating call operation means is performed within a radio service area or not. A storage means 9 stores the information on the transmission destination when the originating call operation in the originating call operation means is performed in the area except a radio service area by the detection result of the control part 7. The control part 7 controls the originating call operation means by the detection result as to whether the originating call operation to the transmission destination is performed within the radio service area or not in the originating call operation means so that the originating call operation to the transmission destination may be automatically performed based on the information on the transmission destination stored in the storage means 9 at a point of time when a device main body 100 enters within the radio service area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital cordless telephone device for voice communication by a digital radio system for public communication, and particularly to a digital cordless telephone device suitable for use in a wide area such as outdoors. It is about.

[0002]

2. Description of the Related Art Today, customers' demands for telecommunications are becoming more diverse and sophisticated. In order to respond to this, telephone devices have come to have various functions, and their designs have become rich. Along with this, in order to construct a highly convenient and efficient communication network for users, a transmission method that transmits information to a remote location with high quality, and a switching method that can reliably select a communication partner. Etc. are also being actively developed.

For example, the mobile communication system is realized not only by wireless technology but also by integrating various control technologies, exchange technologies, terminal technologies, semiconductor component technologies, and the like. Also in this mobile communication system, digitalization of the mobile communication network is in progress in order to improve the quality and economy of the communication technology. Such digital communication technology is applied in various fields, mainly public communication, and as public communication,
So-called pagers, car telephone devices, cordless telephone devices, etc., which are radio calling devices, have been put to practical use. Also,
Development of a public service that allows a so-called digital cordless telephone device, which is a cordless telephone device using digital communication technology, to be used outdoors has been underway.

[0004]

The frequency band that can be used in the mobile communication system is limited, and in order to accommodate a large number of users and construct a system with good serviceability,
Effective use of radio frequencies is essential. One of the factors is the wireless service area. This wireless service area has a large zone method and a small zone method. The large zone method usually covers a service area with one base station, whereas the small zone method has a wide area using a plurality of base stations. It constitutes a service area, and the smaller the size of one zone, the higher the frequency of repeated use of the frequency, and the more effective use thereof. The size of such a wireless service area is determined in consideration of the frequency band used, the radio wave propagation characteristic, the speed of the moving body, the traffic characteristic of the user, and the like.

However, in the digital cordless telephone system, the size of the radio service area per base station is TACS (Total Access Commu).
The radius was 100 to 300 m per zone, which was smaller than the size of the wireless service area in the cellular phone device of the "Nication System" system. Therefore, it is necessary for the user himself to search for the wireless service area and dial. In addition, there are cases where a signboard or the like indicating that it is a wireless service area is provided, but in any case, a troublesome work of searching is required.
In particular, when using the digital cordless telephone device in a wide area such as outdoors, it is difficult to find a wireless service area. Therefore, the operability could not be improved because it was necessary to operate the dial every time the user moved to search for the wireless service area.

Therefore, the present invention has been made in view of the conventional circumstances as described above, and has the following objects.

That is, it is an object of the present invention to provide a digital cordless telephone device which is low in cost and has improved operability.

[0008]

In order to solve the above-mentioned problems, a digital cordless telephone device according to the present invention sets a transmission destination designated by a calling operation means within the wireless service area of the base station and the base station. A digital cordless telephone device that communicates via the detecting means for detecting whether or not the call operation to the destination is performed in the call operating means within the wireless service area, and the detection result of the detecting means. Storage means for storing the information of the destination when the call operation of the call operation means is performed outside the wireless service area, and stored in the storage means when the device body enters the wireless service area. And a control means for controlling the call operation means according to the detection result of the detection means so that the call operation to the transmission destination is automatically performed based on the information of the transmission destination. To.

The digital cordless telephone device according to the present invention is characterized by comprising notifying means for notifying the user whether or not the apparatus main body has entered the wireless service area based on the detection result of the detecting means.

The digital cordless telephone device according to the present invention is characterized in that the notifying means is a ringing means for audibly notifying the user whether or not the apparatus main body has entered the wireless service area.

In the digital cordless telephone device according to the present invention, the notifying means is a display means for visually notifying the user whether or not the main body of the device has entered the wireless service area.

[0012]

In the digital cordless telephone device according to the present invention, the calling operation means performs the calling operation to the designated destination. The detection means detects whether or not the call operation to the transmission destination has been performed in the wireless service area by the call operation means. The storage means stores the information of the destination when the calling operation of the calling operation means is performed outside the wireless service area based on the detection result of the detection means. The control means detects the detection means so that the call operation to the transmission destination is automatically performed based on the transmission destination information stored in the storage means when the device body enters the wireless service area. The calling operation means is controlled according to the result.

In the digital cordless telephone device according to the present invention, the notifying means informs the user whether or not the device body has entered the wireless service area based on the detection result of the detecting means.

In the digital cordless telephone device according to the present invention, the ringing means audibly informs the user whether or not the apparatus main body has entered the wireless service area based on the detection result of the detecting means.

In the digital cordless telephone device according to the present invention, the display means visually informs the user whether or not the apparatus main body has entered the wireless service area based on the detection result of the detection means.

[0016]

An embodiment of the present invention will be described below with reference to the drawings.

The digital cordless telephone device according to the present invention is applied to a digital cordless telephone device 100 as shown in FIG. 1, which is a domestic personal handyphone system (PHS), for example.

That is, the digital cordless telephone device 1
Reference numeral 00 denotes an antenna 1, a high frequency unit 2 connected to the antenna 1, a channel coding unit 3 connected to the high frequency unit 2, and an amplifier 4 connected to the channel coding unit 3 as shown in FIG.
And a receiver 5 and a microphone 6 connected to the amplifier 4. In addition, the digital cordless telephone device 100
Includes a controller 7 connected to the channel coding unit 3, and the controller 7 includes a RAM (Random).
m Access Memory) 8 and EEPROM
(Electrically Erasable an
d Programmable ReadOnly M
memory) 9, timer 10, PROM (Prog)
Ramble Read Only Memor
y) 13, the operation input unit 11, and the display unit 12 are connected to each other. Furthermore, the digital cordless telephone device 1
00 has a power switch (not shown) and a ringer for aurally notifying that an incoming call has arrived.

The antenna 1 is for wireless communication with a base station (not shown). The base station makes or receives a call to or from the other party via a communication line (not shown), transmits a reception signal from the other party to the antenna 1, and also receives the signal from the other party from the antenna 1. To receive the transmitted signal to. In addition, in the base station, a wireless service area in which communication can be performed by the mobile communication system is defined with a predetermined size. That is, the digital cordless telephone device 100 communicates with the other party via the base station within the wireless service area.

The high frequency unit 2 converts the received signal received by the antenna 1 into a signal having a frequency corresponding to the frequency band of the channel coding unit 3, and the signal from the channel coding unit 3 has a high frequency corresponding to the transmission frequency. Convert to frequency signal.

The channel coding unit 3 performs a channel decoding process on the reception signal received by the antenna 1 supplied via the high frequency unit 2 and is input from the microphone 6 supplied via the amplifier 4. The channel coding processing is performed on the generated speech. The channel coding unit 3 also generates a link channel from a control signal, which will be described later, received by the antenna 1 supplied via the high frequency unit 2.

The amplifier 4 is a pulse code modulation (hereinafter referred to as PC
M: Pulse Code Modulation) channel coding modulated by the method 3
The signal from is demodulated and output as voice through the handset 5. Further, the amplifier 4 performs modulation processing on the voice input from the microphone 6 by the PCM method and supplies the voice to the channel coding 3.

The operation input section 11 is composed of a plurality of operation keys, and is a numeral key for inputting information for designating a destination, that is, a telephone number (hereinafter referred to as dial operation), a hook switch. O to open and close
An N / OFF key and a mode key for designating whether or not to make an automatic call are provided.

The display unit 12 is an indicator driven by the control of the control unit 7, and is for visually informing the user whether or not the user is outside the wireless service area.

The PROM 13 incorporates programs for detecting the inside / outside of the wireless service area and the incoming / outgoing call processing. The RAM 8 stores information on the shortened memory, information on the redial history, and the like. The EEPROM 9 stores dial information, which will be described later, and the like.

The control unit 7 is a man-machine interface (MMI) microcomputer, and has a PROM 13
Built-in program, RAM8 and EEPROM
The operation input unit 11 according to the various data read in 9
The entire device is controlled so that the operation based on the operation in 1 is performed. Further, the control unit 7 drives and controls the display unit 12 based on the detection result of whether or not it is within the wireless service area.

Here, in digital communication, encoded information is transmitted as a pulse train arranged at constant time intervals. Therefore, in order to demodulate the original information on the receiving side, the digital cordless telephone device 100 is used. It is necessary to synchronize the base stations. Therefore, the control unit 7 transmits / receives information to / from the base station via the antenna 1 in synchronization with the base station by the clock from the timer 10, and performs channel decoding processing and channel coding on the received signal and the transmitted signal. The channel coding unit 3 is controlled so that the processing is performed.

The control signal for achieving the above synchronization will be described below.

Between the digital cordless telephone device 100 and the base station, as shown in FIG. 2, control signals composed of four slots S _{1 to} S ₄ are multiplexed and transmitted on the time axis. In addition, the period of the multiplexed signal is the superframe period T
s.

As shown in FIG. 3, each of the slots S _{1 to} S ₄ has a 4-bit transient response ramp time R, a 2-bit start symbol SS, and a 62-bit control signal CA.
C1, a 32-bit sync word UW, a 108-bit control signal CAC2, and a 16-bit check bit C
It is composed of RC and 16 guard bits D. Further, in the slots S _{1 to} S ₄ , the dedicated cell channel SC, the paging channels P ₁ and P ₂ , and the broadcast channel B are provided.
C is assigned as a functional channel.

The paging channels P ₁ and P ₂ and the individual cell channel SC are common control channels for transferring control information necessary for call connection. The paging channels P ₁ and P ₂ are transmitted from the base station to the digital cordless telephone device 100.
It is a "point-multipoint" downlink unidirectional channel that transfers the same information all at once to a wide area of a single or multiple cells, that is, a paging area. In such paging channels P ₁ and P ₂ , the 62-bit control signal CAC1 described above is used as the preamble PR, and the 108-bit control signal CAC2 is set to the 4-bit channel type CI, 42.
A bit identification code ID _S and 62-bit paging information are used.

On the other hand, the dedicated cell channel SC is a "point-to-point" bidirectional channel for transferring information necessary for call connection between the base station and the digital cordless telephone device 100, and independent information for each cell. To transfer. In such an individual cell channel SC, the 62-bit control signal CAC1 is used as the preamble PR, the 108-bit control signal CAC2 is used as the 4-bit channel type CI, the 42-bit originating identification code ID _S , and the 42-bit incoming identification code. I
D _R and 34-bit individual cell information. In the individual cell channel SC, the uplink channel is random access.

The broadcast channel BC is a downlink one-way channel for broadcasting control information from the base station to the digital cordless telephone device 100, and transfers information about the channel structure, system information and the like. In such a broadcast channel BC, the 62-bit control signal CAC1 is sent to the preamble PR, as in the paging channels P ₁ and P ₂ described above.
The 108-bit control signal CAC2 is used as a 4-bit channel type CI, a 42-bit calling identification code ID _S , and a 62-bit broadcast information.

Therefore, as shown in FIG. 2, the channel coding unit 3 receives from the control signal received by the antenna 1 the broadcast channel BC, the dedicated cell channel SC, the paging channel P ₁ , the paging channel P ₂ ，
A link channel composed of the broadcast channel BC, the dedicated cell channel SC, the paging channel P ₁ , ... Is generated in this order. In addition, the control unit 7 detects whether or not the current link is established by determining whether or not the link channel has been established, and the channel so that signal processing is performed in synchronization with the base station. Control the coding unit 3.

An incoming / outgoing call in a normal wireless service area will be described below.

First, by operating the power switch to "ON", the digital cordless telephone device 100 is
Under the control of the control unit 7, after receiving a control signal from the base station and synchronizing with the control signal, the base station is notified of its own position and enters a standby state. In such a state, the digital cordless telephone device 100 enters the battery saving mode, and the power is turned off except for the control unit 7. And
The control unit 7 controls the entire device so that the digital cordless telephone device 100 is turned on every 1.2 seconds, for example, in synchronization with the base station by the timer 10. In this way, the digital cordless telephone device 100 becomes in a state of being able to communicate with the base station.

Next, when making a call in the above-described state, the user operates the ON / OFF key of the operation input unit 11 so that the hook switch is closed. Then, when the user performs a dial operation with the numeric keys of the operation input unit 11, a destination selection signal is sent out via the antenna 1. Therefore, the base station
The selection signal transmitted via the antenna 1 is received, and the selection signal is transmitted via the communication line.

When a call is received, that is, when a call signal received at the base station is received by the antenna 1, the ringer is driven by the call signal under the control of the control unit 7. Therefore, the user knows that there is an incoming call, and the user operates the operation input unit 1 so that the hook switch is opened.
The response is notified by operating the ON / OFF key of 1.

When a call is made or a call is received as described above and a call is established, the base station transmits the received signal supplied via the call line to the digital cordless telephone device 100. The voice input from the microphone 6 is transmitted from the antenna 1 to the base station as a transmission signal.

Next, when the received signal from the base station is received in the call state as described above, the high frequency unit 2 corresponds the received signal received by the antenna 1 to the frequency band of the channel coding unit 3. Convert to a signal of the specified frequency. Channel coding unit 3
Under the control of the control section 7, performs a channel decoding process on the reception signal received by the antenna 1 and supplied via the high frequency unit 2, and supplies it to the amplifier 4 as an audio signal. The amplifier 4 performs demodulation processing on the audio signal obtained by the channel coding unit 3,
It is output as voice through the handset 5.

When the voice input by the microphone 6 is transmitted, the amplifier 4 uses the PCM method in accordance with the PCM method.
The input voice is subjected to modulation processing and supplied to the channel coding unit 3 as a voice signal. Under the control of the control unit 7, the channel coding unit 3 performs channel coding processing on the audio signal supplied from the microphone 6 via the amplifier 4 and supplies the audio signal to the high frequency unit 2 as a transmission signal. High frequency unit 2
Converts the transmission signal obtained by the channel coding 3 into a signal having a frequency corresponding to the transmission frequency and transmits the signal via the antenna 1.

Here, as described above, the radio wave of the base station can be received in the radio service area, so that the call can be made with the other party, but the radio wave of the base station can be transmitted outside the radio service area. You cannot talk to the other party because you cannot receive it. In view of this, in this embodiment, it is detected that an incoming / outgoing call cannot be made and a possible state is entered, and an automatic call is made when the incoming / outgoing call is made. In addition, when a call cannot be made or received, the display unit 12 is driven to visually notify the user.

The incoming and outgoing calls outside the wireless service area as described above will be specifically described below.

Here, FIG. 4 is a flow chart showing the automatic call processing in the control unit 7. Below, FIG.
The calling process in the control unit 7 will be described with reference to FIG.

First, the power switch is operated to "ON". At the same time, a memory for dial information is secured on the EEPROM 9. Then, by the timer interrupt from the timer 10 (step S402), the entire device is controlled so that the digital cordless telephone device 100 is turned on every 10 seconds, and the antenna 1 continuously receives the control signal from the base station. Yes (step S403). At this time, a dial operation is performed on the operation input unit 11, and a mode is specified by the mode key of the operation input unit 11 that specifies whether or not to perform the automatic call.

Next, it is determined whether the electric field strength of the control signal received by the antenna 1 has reached a communicable level (step S404).

When it is determined that the electric field strength of the control signal has reached a level at which communication is possible, the control signal indicates the sync word UW of the paging channels P ₁ and P ₂ shown in FIG.
Is detected (step S405).

When it is determined that the sync word UW has been detected, it is determined whether or not the link channel as described above has been established (step S406).

When it is determined that the link channel is established, the terminal number unique to the digital cordless telephone device 100 is transmitted to the base station to register the position of the digital cordless telephone device 100 on the base station side (step S407). .

Then, it is determined whether or not the dial number is stored in the EEPROM 9. If the dial number is stored, it is determined whether or not the identification flag is added to the stored dial number (step S408).

When it is determined that the dial number is stored in the EEPROM 9 and the identification flag is added to the dial number, the calling operation is performed based on the dial number stored in the EEPROM 9. The entire device is controlled (step S409). As a result, the call state is set (step S410), and communication with the other party is performed in the same manner as the processing in the call state in the wireless service area described above. And after the call ends, EEP
The dial number and the identification flag stored in the ROM 9 are cleared, and a standby state is set.

Further, when the dial number is not stored, or when it is determined that the identification flag is not added to the dial number, that is, when the dial operation is not performed, or it is specified that the automatic call is not made. In some cases, it will be in a standby state.

On the other hand, when it is determined in step S404 described above that the electric field strength of the control signal has not reached the level at which communication is possible, or step S405 described above.
In step S406, when it is determined that the synchronization word UW is not detected, or when it is determined in step S406 that the link channel has not been established, that is, when the communication with the base station is not possible, It is determined whether or not the number of continuous receptions in S403 has reached a predetermined number (step S411).

When it is determined that the number of continuous receptions has reached the predetermined number, it is determined that the wireless service area is out of the wireless service area, and the dial number input by the dial operation is stored in the memory secured in the EEPROM 9. When the automatic dialing is designated by the mode key, an identification flag is added to the dial number and stored (step S412). Then, the display unit 12 is driven,
A standby state is set (step S413). Therefore, the user visually recognizes from the display unit 12 that the wireless service area is outside.

If it is determined that the number of continuous receptions has not reached the predetermined number, the process returns to step S403 described above, and the processes from the continuous reception are performed.

As described above, the radio wave from the base station is detected by continuous reception, and when the radio wave is detected, the antenna 1 transmits and receives.

As described above, in this embodiment, if the dialing operation is performed once even outside the wireless service area, if the automatic call mode is designated, a call is automatically made at the time of entering the wireless service area. Therefore, it is not necessary to perform a troublesome operation of performing a dial operation each time the user moves and searches for a wireless service area. Further, when it is outside the wireless service area, the user can visually recognize it by driving the display unit 12. As a result, the user can carry the wireless service area without worrying about it. Therefore, operability can be improved.

Further, since the operation as described above is based on the software incorporated in the control section 7, the operability can be improved without increasing the cost.

In the embodiment described above, the display unit 12 is
Although it is an indicator that visually informs the user, it may be an indicator that auditorily informs.

FIG. 5 is a flow chart showing an automatic call-out process in the control unit 7 when an audible indicator is used. Hereinafter, the control unit 7 will be described with reference to FIG.
The call origination process in FIG.

First, it is determined whether or not the moved place is outside the wireless service area (step S502). As shown in FIG. 4, this determination is movement from outside the wireless service area depending on the detection of the synchronization word UW of the control signal and whether or not the EEPROM 9 stores the dial number with the identification flag. It can be performed by determining whether or not.

When it is judged that the wireless service area is out of the wireless service area, an identification flag is added to the dial number input by the dial operation and stored in the EEPROM 9 (step S503). Then, the indicator is driven and controlled so that the indicator emits a busy tone (step S
504), the standby state is entered.

On the other hand, if it is determined that the service is not outside the wireless service area, that is, if it is determined that the service is within the wireless service area, a calling process is performed (step S506). That is, the entire device is controlled so that the calling operation is performed based on the dial number stored in the EEPROM 9. Then, after the calling operation is completed, the dial number and the identification flag stored in the EEPROM 9 are cleared to enter the call state (step S507), and after the call ends, the standby state is entered (step S505).

Here, in the processing of step S506, although not shown, for example, when the EEPROM 9 has already been cleared, that is, when the dial operation has not been performed, the above-mentioned indicator is made to emit a light sound. Control the indicator. As a result, the user auditorily knows that he / she has entered the wireless service area.

As described above, by using the audibly informing indicator, the user can audibly know that he is out of the wireless service area. Further, when the dial operation is not performed, it is possible to auditorily know that the user has entered the wireless service area from outside the wireless service area.

Further, in the above-described embodiment, the digital cordless telephone device according to the present invention is applied to the domestic personal handyphone system (PHS), but the invention is not limited to this, and the system is developed in Europe, for example. The digital cordless telephone device according to the present invention can also be applied to “CT2”.

[0067]

In the digital cordless telephone device according to the present invention, the calling operation means performs the calling operation to the designated destination. The detection means detects whether or not the call operation to the transmission destination has been performed in the wireless service area by the call operation means. The storage means stores the information of the destination when the calling operation of the calling operation means is performed outside the wireless service area based on the detection result of the detection means. The control means detects the detection means so that the call operation to the transmission destination is automatically performed based on the transmission destination information stored in the storage means when the device body enters the wireless service area. The calling operation means is controlled according to the result. As a result, the user does not need to dial every time he / she searches for the wireless service area, because the user automatically dials when entering the wireless service area with only one dial operation. Therefore, operability can be improved. Moreover, since each operation is controlled by the control means, the operability can be improved at low cost.

In the digital cordless telephone device according to the present invention, the notifying means informs the user whether or not the device body has entered the wireless service area based on the detection result of the detecting means. As a result, the user can know whether or not the device body has entered the wireless service area, and can use the digital cordless telephone device without worrying about the wireless service area. Therefore, the operability can be further improved.

In the digital cordless telephone apparatus according to the present invention, the ringing means audibly informs the user whether or not the apparatus body has entered the wireless service area based on the detection result of the detecting means. This allows the user to aurally know whether or not the device body has entered the wireless service area.

In the digital cordless telephone apparatus according to the present invention, the display means visually informs the user whether or not the apparatus main body has entered the wireless service area based on the detection result of the detection means. As a result, the user can visually know whether or not the device body has entered the wireless service area.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a digital cordless telephone device according to an embodiment.

FIG. 2 is a diagram for explaining a control signal by a super frame of a personal handy phone system.

FIG. 3 is a format diagram showing a configuration of each slot in the superframe.

FIG. 4 is a flowchart showing an automatic call processing.

FIG. 5 is a flowchart showing a calling process when an auditory notification indicator is used.

[Explanation of symbols]

 1 Antenna 2 High Frequency Unit 3 Channel Coding Unit 4 Amplifier 5 Handset 6 Microphone 7 Control Section 8 RAM 9 EEPROM 10 Timer 11 Operation Input Section 12 Display Section 13 PROM 100 Digital Cordless Telephone Device

Claims (4)

[Claims] 1. A digital cordless telephone device for communicating via a base station with a destination designated by a call operating means within a wireless service area of the base station, wherein the call operating means makes a call to the destination. Detecting means for detecting whether or not the call operation is performed within the wireless service area, and the transmission destination when the call operation of the call operation means is performed outside the wireless service area based on the detection result of the detecting means. Storage means for storing the information of the destination, and when the device main body enters the wireless service area, the calling operation to the destination is automatically performed based on the information of the destination stored in the storage means. A digital cordless telephone device, comprising: a control means for controlling the call operation means according to the detection result of the detection means. 2. The digital cordless telephone device according to claim 1, further comprising notifying means for notifying a user whether or not the apparatus main body has entered the wireless service area based on the detection result of the detecting means. 3. The digital cordless telephone device according to claim 2, wherein the notifying means is a ringing means for audibly notifying the user whether or not the device body has entered the wireless service area. 4. The digital cordless telephone device according to claim 2, wherein the notifying means is a display means for visually notifying a user whether or not the apparatus main body has entered the wireless service area.