JP2000050361A - Cordless telephone system, slave set in the cordless telephone system and master set in the cordless telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select a home mode/a public mode in a slave set and an at-home mode/stay-out mode in a master set automatically in the cordless telephone system consisting of a master set and a slave set. SOLUTION: When the slave set in the cordless telephone system set in a home mode or in a public mode, it can switch into the public mode or the home mode based on a reception level of a control signal from the master set. Furthermore, the slave set in the cordless telephone system which is in the standby state in the home mode transmits a prescribed control signal at a prescribed time interval so as to allow the master set to be switched into the at-home mode or the stay-out mode based on the prescribed control signal from the slave set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone system having public and home communication modes.
In particular, it relates to a cordless telephone system having an automatic switching function between these modes.

[0002]

2. Description of the Related Art At present, a cordless telephone system called "second generation cordless telephone system" (PHS) has been put to practical use. This is based on the "2nd generation cordless telephone system standard (RCR-STD28)" issued by the Radio System Development Center, and in homes, it communicates with a base unit connected to a public line. By performing wireless communication, it can be used as a conventional cordless telephone (home mode) and can also be used as a mobile phone by performing wireless communication with a public base station installed outdoors. (Public mode).

In this cordless telephone system, when in the home, it is more advantageous to use the home mode in terms of cost, and a switching key is provided to switch between these calling modes. ing.

On the other hand, the master unit is provided with a so-called answering machine function, and a switching key for ON / OFF of the function is provided.

[0005]

However, the operation of the switching key for the call mode of the slave unit and the switching key for the answering machine function of the master unit must be performed each time the user comes home or goes out, which is very troublesome. It is common to accidentally forget the operation.

[0006]

In view of the above, in the cordless telephone system of the present invention, the cordless telephone system, in the home mode and the public mode, operates in the public mode or the public mode based on the reception level of the control signal from the master unit. Is characterized by switching to the public mode.

Further, in the cordless telephone system of the present invention, the slave unit transmits a predetermined control signal at predetermined time intervals during standby in the home mode, and the master unit transmits the control signal based on the predetermined control signal from the slave unit. In this case, the mode is switched to the home mode or the answering machine mode.

[0008]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a cordless telephone system according to the present invention, which is referred to as a "second generation cordless telephone system standard (RCR-R)" issued by the Radio System Development Center.
STD28) is a block diagram showing a configuration of a main part of the slave unit (10) when applied to a digital cordless telephone conforming to "STD28)". In the figure, (101) is an antenna for transmitting and receiving radio waves, and (102) Is an RF / IF that converts the frequency of a radio signal transmitted and received by the antenna (103)
, (103) a modulation / demodulation unit for performing π / 4 shift four-phase QPSK modulation and demodulation, (104) a digital signal processing circuit for performing TDMA signal processing and the like, and (105) a transmission microphone (10).
6) The analog audio signal and digital signal processing circuit (1)
04) of the digital audio signal output from ADPCM /
This is an audio signal processing circuit that performs PCM conversion, D / A, and A / D conversion. The D / A converted signal is output to a receiving speaker (107). A control circuit (108) transmits and receives a control data signal to and from the digital signal processing circuit (104).
0) and a protocol such as an outgoing call or an incoming call with the base station. (109) is a PLL circuit, and the control circuit (1)
08), the receiving frequency and the transmitting frequency of the RF / IF unit (102) are changed. (11
0) is a key circuit, an on-hook / off-hook key,
It consists of a numeric keypad and the like. (111) is an ID-ROM, which is ID data (PSI) unique to the child device at the time of shipment from the factory.
D) is written. An ID memory (112) records an ID (CSID) unique to the parent device (10) when the child device (20) is registered in the specific parent device (10).

FIG. 2 is a block diagram showing a configuration of a base unit (20) of the cordless telephone system according to the present invention. In the figure, (201) is an antenna for transmitting and receiving radio waves,
(201) is an RF / IF unit that performs frequency conversion of a radio signal transmitted and received by the antenna (201), (203) is a modulation / demodulation unit that performs π / 4 shift four-phase QPSK modulation demodulation,
(204) is a digital signal processing circuit for performing TDMA signal processing and the like, and (205) is an ADPCM / PCM of an analog audio signal transmitted from the telephone line (L) and a digital audio signal output from the digital signal processing circuit (204). Audio signal processing circuit for performing conversion, D / A, and A / D conversion;
A line connection circuit (206) performs an interface between the voice signal processing circuit (205) and the telephone line (L) during a call, in addition to processing such as line connection and incoming call detection at the time of calling.

A control circuit (207) transmits and receives a control data signal between the digital signal processing circuit (204).
On the basis of the control data, a protocol such as calling and receiving calls is executed with the handset (10). Reference numeral 208 denotes an answering machine circuit, which responds to an incoming call when the base unit 20 is set to the answering machine mode, and stores the message memory (2) in advance.
09), "I'm away now.
An answering machine message such as "Please leave a message" is sent to the telephone line (L), and then a message of the caller sent via the telephone line (L) is stored in the message memory (209). (210) is a slave unit registration key, (211) is an ID-ROM in which an ID (CSID) determined individually for the master unit (20) is written,
(212) is the slave unit (1) registered in the master unit (20).
0) is an ID memory in which the ID is stored. (213)
Is a PLL circuit for changing the reception frequency and the transmission frequency of the RF / IF unit (202) based on an instruction from the control circuit (207).

In the above configuration, when registering the slave unit (10) in the master unit (20), the slave unit registration key (210)
Operate. That is, the slave unit (10) is brought closer to the master unit (20), and the master unit (20) is set to the slave unit registration key (210).
Is operated, and the slave unit (10) enters a slave unit registration state by performing a combination operation of each key of the key circuit (110). In the child device registration state, the parent device (20) is
0), the ID (PSID) of the slave (10) transmitted from the slave (10) is stored in the ID memory (212).
Is the parent device ID (CSID) transmitted from the parent device (20)
Is received and stored in the ID memory (112). Only after the completion of the registration of the slave unit, the slave unit (10)
You can make a call via.

FIG. 3 is a flowchart of a program written in the control circuit of the cordless telephone system of the present invention. FIG. 4 is a flowchart of the program written in the control circuit of the cordless telephone system of the present invention. It is a flowchart of a program, and shows operation | movement in the said structure with a parent machine (2
The description will be made with reference to FIGS. 3 and 4 assuming that the home mode is in the home mode and the slave unit 10 is in the home mode.

In the standby mode in the home mode, the control circuit (108) of the slave unit (10) transmits a specific control signal at predetermined time intervals via the home mode uplink control channel (S2). The specific control signal may include the ID (PSID) of the child device (10) and may be composed of a code or the like indicating that it is for in-range determination. Predetermined between machines).

On the other hand, the control circuit (207) of the master unit (20)
Transmits a control signal at predetermined time intervals via the downlink control channel in the home mode (S12). This control channel corresponds to a logical control channel (LCCH). Note that the frequency of the downlink control channel in the home mode is predetermined. The control circuit (108) of the child device (10) monitors the registered downlink control channel from the parent device (20) and determines the reception signal level of the downlink control channel (S4). If the determination result is equal to or higher than the predetermined level, a corresponding process (for example,
If it is a call, a response to the call is made, and the home mode is continued (S5). If the determination result is less than the predetermined level, the mode is switched to the public mode (S6). In this public mode, the control circuit (108) of the child device (10)
It monitors the downlink control channel from the public base station, responds to the call if there is a call, and alternately monitors the downlink control channel from the public base station and alternately performs downlink control from the registered base unit (20). The received signal level of the channel is determined (S7 to S10). The reception time of the downlink control channel from the registered base unit (20) is determined in consideration of the transmission interval of the downlink control channel. For example, if the downlink control channel is transmitted at an interval of 100 ms, it will be received for 300 ms. In addition, the child machine (1
0) In the public mode, transmission of a specific control signal on the uplink control channel in the home mode is stopped.

When the downlink control channel from the registered base unit (20) becomes higher than a predetermined level, the handset (10)
The control circuit (108) switches to the home mode and operates in the same manner as described above.

The control circuit (207) of the parent device (20) monitors the uplink control channel from the child device (10) (S1).
3) It is determined whether a specific control signal has been received from the slave unit (10) (S14). For a specific control signal,
The home mode is continued, and if it is not a specific control signal, a corresponding process is performed according to the content of the control signal (S15). In addition, if it is not a specific control signal, it is determined whether or not a predetermined time has elapsed since the reception of the specific control signal, and if not, the home mode is continued as described above. If the predetermined time has elapsed, the mode is switched to the answering machine mode (S16, 17). Even in the answering machine mode, the control circuit (207) of the base unit (20) transmits a control signal through the downlink control channel of the home mode and receives a specific control signal from the slave unit (10). A determination is also made, and if received, the mode is switched to the home mode (S12-
14).

As described above, the master unit (20) switches between the home mode and the answering machine mode depending on whether or not a specific control signal is received from the slave unit (10). ) Stops the transmission of the specific control signal when the mode is switched to the public mode, and resumes the transmission of the specific control signal when the mode is switched to the home mode. The switching between the home mode and the public mode and the switching between the home mode and the answering machine mode of the base unit (20) occur almost synchronously unless there is a special cause such as radio interference (there is a predetermined time lag). .

[0019]

According to the present invention having the above-described structure, switching between the home mode and the public mode in the slave unit and switching between the home mode and the answering machine mode in the master unit can be automatically performed. .

[Brief description of the drawings]

FIG. 1 is a block diagram of a slave unit of the cordless telephone system of the present invention.

FIG. 2 is a block diagram of a base unit of the cordless telephone system of the present invention.

FIG. 3 is a flowchart of a program written in a control circuit of a slave unit of the cordless telephone system according to the present invention.

FIG. 4 is a flowchart of a program written in a control circuit of a base unit of the cordless telephone system of the present invention.

[Explanation of symbols]

 10 slave unit 108 control circuit 20 master unit 207 control circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hisayuki Ogura 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Inside Sanyo Electric Co., Ltd. (72) Inventor Baba ▲ Saki ▼ Noboru 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori Sanyo Electric Co., Ltd. (72) Inventor Satoshi Hirano 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori Sanyo Electric Co., Ltd. (72) Inventor Yoshihiro Sasaki 3-201 Minamiyoshikata, Tottori City, Tottori Sanyo Electric (72) Inventor Masaaki Taniguchi 3-201 Minamiyoshikata, Tottori City, Tottori Pref. GG12 HH14 JJ52 JJ54

Claims (5)

[Claims] A wireless communication is performed between a base unit connected to a public line and a home mode connected to the public line and an outdoor public base station by performing wireless communication with the base unit. In a cordless telephone system comprising a handset having a public mode capable of making a telephone call, the handset is configured to be connected to a home based on a reception level of a control signal from the master in a home mode and a public mode. A cordless telephone system characterized by switching between a mode and a public mode. 2. A telephone call is made by performing wireless communication with a base unit connected to a public line to perform wireless communication between a home mode connected to the public line and an outdoor public base station. A cordless telephone system having a public mode capable of switching to a home mode or a public mode based on a reception level of a control signal from the master unit in the home mode and the public mode. Cordless telephone system cordless handset. 3. A base unit connected to a public line and having a home mode and an answering machine mode, a home mode connected to the public line by performing wireless communication with the base unit, and an outdoor public base. In a cordless telephone system including a slave unit having a public mode capable of making a call by performing wireless communication with a station, the slave unit performs a predetermined control every predetermined time during standby in the home mode. A cordless telephone system, wherein a signal is transmitted, and the base unit switches to a home mode or an answering machine mode based on a predetermined control signal from the handset. 4. A home mode connected to a public line and a home mode connected to a public line by performing wireless communication with a base unit having a home mode and an answering machine mode, and an outdoor public base station. In a slave unit of a cordless telephone system having a public mode in which a call can be made by performing wireless communication, a standby mode in a home mode, a predetermined control signal is transmitted to the base unit at predetermined time intervals. Cordless telephone system cordless handset. 5. A base unit connected to a public line and having a home mode and an answering machine mode, a home mode connected to the public line by performing wireless communication with the base unit, and an outdoor public base. In a base unit of a cordless telephone system including a slave unit having a public mode capable of making a call by performing wireless communication with a station, a predetermined control signal transmitted from the slave unit at predetermined intervals. A base unit of a cordless telephone system characterized in that the mode is switched to a home mode or an answering machine mode based on a telephone number.