JPH0923465A - System and method for exchanging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain intermittent receiving in a mobile terminal without delaying a responce processing except in the mobile terminal by recognizing the kind of a radio wave terminal from terminal information transmitted from the terminal in a main device and controlling the transmission interval of control data to be transmitted to the terminal based on the kind. SOLUTION: In the main device 1, plural outside lines and terminals are contained and a call is exchanged between them. In the connecting device 2, the radio wave terminal is controlled by radio wave by receiving the control of the main device 1 and a radio transmission route is established. A telephone set 3 used exclusively for radio wave executes the call through the outside lines contained in the main device 1 and also through the extension. A radio wave adapter 4 attains data transmitting by radio wave. Moreover, the main device 1 contains a PSTN line 7 and an ISDN circuit 9. In this configuration, the interval for transmitting control information is changed in accordance with the kind of the temrinal contained in the extension. Therefore, realtime transmission/reception is possible in the radio wave adapter, etc., and intermittent reception in the mobile terminal by one connecting device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exchange system and an exchange method thereof, and more particularly to an exchange system and an exchange method for exchanging terminals with each other or with terminals and lines by using radio.

[0002]

2. Description of the Related Art A wireless communication system uses a wireless transmission system for a low power analog cordless telephone for wireless communication between an extension terminal and a main device. That is, the modulation method is FM
, Two control channels and 87 voice communication channels can be used, and communication is point-to-point
Only possible. In order for the extension wireless terminal to communicate with the main device, a connection device for the extension wireless terminal is required.

At the start of communication, first, a voice communication channel to be used is determined in the control channel, and after the communication channel is determined, the channel is changed to that channel, and thereafter the communication is continued using that channel. become.

Next, the configuration and basic operation of each part of the wireless communication system will be described.

[Configuration of Main Device] FIG. 1 is a block diagram showing the configurations of a wireless communication system and its main device.

In the figure, a main unit J1 is a main part of a switching system, accommodates a plurality of outside lines and a plurality of terminals, and exchanges calls between them. The connection device J2 receives the control from the main device J1 to wirelessly control the wireless terminal in order to accommodate the wireless terminal (one of the wireless dedicated telephones, which will be described later) that is connected one-to-one in the system, and the wireless transmission line. Establish.

Further, the wireless telephone J3 is a terminal for making a telephone call with an external line accommodated in the main device J1 and an extension telephone call via the connection device J2.

The main unit J1 is one of the outside line networks.
PSTN (existing public telephone network) PS4 line that is an external line from J4
J5 and SLT (single telephone) J6, which is one of the terminals connected to the main device J1, are housed. The internal configuration of the main device J1 will be described below.

As shown in FIG. 1, the CPU J101 is a main unit J1.
It is the central part of the system and controls the entire main device including exchange control. The ROM J102 stores a control program for the CPU J101, and the RAM J103 stores various data for the CPU J101 to control and provides a work area for various calculations. Under the control of the CPU J101, the call path unit J104 exchanges the call (time division exchange), and the PSTN line I / F J105 replaces the CPU J1.
Under 01 control, incoming call detection to accommodate PSTN line J5,
Performs PSTN line control such as selection signal transmission and DC loop closure. Also, SLT I / F J106 is under the control of CPU J101.
Power supply to accommodate J6, loop detection, selection signal reception,
Sends a call signal.

The telephone set J107 functions as an extension multi-function telephone under the control of the CPU J101 when the main unit J1 is normally energized, and functions as an SLT at the time of power failure. , It has a communication circuit and an indicator. The tone sending circuit J108 sends out various tones such as a PB signal, a dial tone, and a ring tone. In addition, the connection device I / F J109 is a CPU
Under the control of J101, in order to accommodate the connection device J2, a call signal and a control signal are transmitted / received to / from the connection device J1.

[Configuration of Connection Device] FIG. 2 is a block diagram showing the configuration of the connection device J2.

In the figure, a CPU J201 is a central part of the connection device J2, and controls the entire connection device including a communication channel control and a radio part control. Further, ROM J202 stores the control program of CPU J201, and EEPROM J203 stores the call code (system ID) of this system. In addition, RAM J204
Stores various data for the CPU J201 to control, and provides a work area for various calculations.

The main unit I / F J205 is under the control of the CPU J201.
It transmits and receives call signals and control signals to and from the connection device I / F J109 of the main device J1. PCM CODEC (CODEC) J206 is CPU J201
Under the control of the main device I / F J205, it converts the PCM coded speech signal into an analog voice signal and sends it to the voice processing LSI J207, which will be described later, and at the same time, the voice processing LS
It converts the analog audio signal received from I J207 into PCM code and sends it to the main unit I / F J205.

Under the control of the CPU J201, the voice processing LSI J207 receives a demodulated signal from a radio unit section J208, which will be described later, and if the received signal is control data, A / D converts it.
When the received signal is an audio signal, it is descrambled, expanded, etc. and output to PCMCODEC J206. At the same time, the voice processing LSI J207 D / A converts the control data received from the CPU J201, and converts it into the wireless unit J208.
To the wireless unit section by performing processing such as scrambling and compression on the audio signal received from PCMCODECJ206.
Send to J208.

Under the control of the CPU J201, the radio unit section J208 modulates the control data and voice signal received from the voice processing LSI J207, processes them so that they can be transmitted by radio, and transmits them to the radio dedicated telephone J3. At the same time, it demodulates the signal received from the wireless telephone J3 and transmits the extracted control data and voice signal to the voice processing LSI J207.

[Configuration of Radio Dedicated Telephone] FIG. 3 is a block diagram showing the construction of the radio dedicated telephone J3.

In the figure, a CPU J301 is the center of the wireless telephone J3 and controls the entire wireless telephone including wireless control and call control. ROM J302 stores the control program of CPU J301, and EEPROM J303 stores the calling code (system ID) of this system and the sub ID of wireless telephone J3. Further, the RAM J304 stores various data for the CPU J301 to control, and provides a work area for various calculations.

Under the control of the CPU J301, the call path unit J305 inputs / outputs a call signal between a handset J308, a microphone J309, and a speaker J310, which will be described later. Voice processing LSI J306 is a CPU
Under the control of J301, it receives the demodulated signal from the wireless unit J307, and if the signal is control data, A / D converts it and the CPU
If the received signal is a voice signal, it is processed by descrambling and decompressing and output to J301.
The control data received from the CPU J301 is D / A converted and sent to the wireless unit section J307.
The audio signal received from 305 is subjected to processing such as scrambling and compression and transmitted to the wireless unit J307.

On the other hand, under the control of the CPU J301, the wireless unit J307 modulates the control data and the audio signal received from the audio processing LSI J306 and processes them into a state in which they can be transmitted wirelessly, and the wireless connection device. At the same time, the signal received from the wireless connection device J2 is demodulated wirelessly and the extracted control data and voice signal are transmitted to the voice processing LSI J306.

The handset J308 is for inputting and outputting a voice signal for a telephone call, the microphone J309 is for collecting and inputting the voice signal, and the speaker J310 is for outputting the voice signal in a loud voice. Also,
The dial number input from the key matrix J311 and the usage status of external lines are displayed on the display unit J312. The key matrix J311 is composed of dial keys for inputting dial numbers and the like, and function keys such as an outside line key, a hold key, and a speaker key.

[Operation of Radio Communication System] Next, the basic operation of the radio communication system will be described.

FIG. 4 is an operation sequence diagram of the wireless communication system. The wireless telephone J3 transmits a connection notification signal to the connection device J2 on a predetermined wireless control channel when a call origination request is made (step J401). Upon receiving this connection notification signal, the connection device J2 checks the usage status of the wireless communication channel and, if there is a usable communication channel, transmits a connection response signal to the wireless telephone J3 (step J402). Upon receiving the connection response signal, the wireless telephone J3 switches the frequency used from the wireless control channel to the wireless communication channel and transmits a channel movement notification signal to the connection device J2 (step J403). After that, signals are transmitted and received on the call channel.

Upon receiving the movement notification signal, the connection device J2 confirms the shift to the call channel, transmits a channel movement response signal to the wireless telephone J3 (step J404), and the main device J1.
A line connection notification is transmitted to (step J405), and thereafter, the state transits to the talking state. When the wireless telephone J3 receives the channel movement response signal and confirms the establishment of the wireless line, it transmits an outside line transmission signal to the connection device J2 (step J406).

The connection device J2 that has received this external line transmission signal
Sends an outside line to main device J1 (step J40
7), voice connection request is sent from main device J1 to connection device J2 (step J408), and further from connection device J2 to wireless-only telephone
When the call is made to J3 (step J409), a dial tone is sent (step J410). Then, a dial call is made (step J411), and thereafter, the main device J1 makes a call operation to an outside line, and when the other party answers, the main device J1 shifts to a call (step J412).

By the above procedure, the wireless telephone J3
Can make a call via a public line, but also for an incoming call, a call can be started and continued by acquiring a wireless call channel by the same procedure as above.

[Description of Intermittent Reception Operation] Next, the basic operation of intermittent reception will be described. FIG. 5 is a sequence diagram of discontinuous reception, and FIG. 6 is a diagram showing a frame structure in discontinuous reception.

In the case of the analog radio telephone system, the CPU J301 of the mobile unit monitors the carrier signal of the control channel from the fixed unit output from the radio unit J307 at the interval T2 shown in FIG. The carrier monitoring time at that time is T1.

The method of monitoring the carrier signal is to read the signal indicating the threshold value from the wireless unit J307 at the port, and to use the analog signal indicating the radio field intensity of the control channel from the fixed unit output from the wireless unit J307 to the CPU. There is a method of monitoring the A / D converter built in J301 and detecting the carrier by comparing the digital values. Further, at the monitoring time T1, the CPU J301 is not always monitoring the carrier signal of the control channel from the fixed machine, but is t1 at the interval of t2.
The carrier is monitored only during the period.

After this processing, when the call state is entered, the CP
U J301 is a carrier channel carrier signal from a fixed machine.
Monitor for t3 at t4 intervals.

As shown in FIG. 6, in a digital radio (PHS) terminal, communication is performed between CS (cell station) and PS (personal station) by an uplink 4 channel and downlink 4 channel TDMA method. . When transmitting control data from CS to PS, the same control data is transmitted n times in a predetermined downlink time slot.

As shown in FIG. 6, the PS receives the time slot carrying the control data addressed to itself in synchronization with a cycle of 5 × n (ms). After receiving,
Control data is placed in a predetermined uplink time slot and transmitted to the CS.

The CS constantly monitors the control data on a predetermined time slot transmitted from the CS in the TDMA frame repeated at 5 ms intervals, and performs call control.

[0033]

However, the above-mentioned technique has the following problems.

In the above-mentioned wireless exchange system, one fixed machine is required for one wireless telephone, so that a plurality of fixed machines are naturally required when accommodating a plurality of extensions. Also, when the wireless-only telephone is a mobile terminal, power is supplied from the battery, so intermittent reception must be performed, whereas in the case of a semi-fixed wireless terminal that is intended to be used on a desk, etc. Since it can receive power from the AC line, there is no need to perform intermittent reception.

If a system in which the fixed device does not perform intermittent reception is used, the mobile terminal must always monitor the transmission signal from the fixed device, which causes a problem of accelerating battery consumption. On the other hand, when a system such as a PHS terminal that performs intermittent reception is used, the response processing of the terminal becomes slow and the operability deteriorates.

The present invention is intended to solve the above-mentioned problem, and provides a switching system and a switching method thereof which allow a mobile terminal to perform intermittent reception without delaying the response processing of other than the mobile terminal. The purpose is to do.

[0037]

The present invention has the following configuration as one means for achieving the above object.

An exchange system according to the present invention is an exchange system including a main unit accommodating an outside line and a plurality of terminals which perform wireless communication with the main unit. The main unit is sent from the terminal. Based on the recognition means for recognizing the type of the terminal from the received terminal information and the recognized type of the terminal,
And a control means for controlling a transmission interval of control data transmitted to the terminal.

The exchange method of the exchange system according to the present invention is a method for exchanging an exchange system comprising a main unit accommodating an outside line and a plurality of terminals for wireless communication with the main unit. A receiving step of receiving terminal information from the terminal, a recognizing step of recognizing the terminal type from the received terminal information, and a control step of controlling a transmission interval of control data to be transmitted to the terminal based on the recognized terminal type And having.

[0040]

BEST MODE FOR CARRYING OUT THE INVENTION An exchange system according to an embodiment of the present invention will be described in detail below with reference to the drawings.

In recent years, the spread spectrum communication has received particular attention among the digital wireless communication systems. This spread spectrum communication is known as a technique that spreads information to be transmitted in a wide band to enhance the interference removal capability and to provide excellent confidentiality. Currently, 2.4GHz in countries around the world
Band frequencies are allocated for spread spectrum communications,
It is spreading all over the world.

The spread spectrum communication system is roughly divided into a frequency hopping system (FH system) and a direct spread system (DS).
Method). The FH method performs transmission using a wide band by changing the modulation frequency within a fixed time, and the DS method uses pseudo-noise code at a speed that is 10 to several hundred times faster than the information to be transmitted. A wide band is used by performing spread modulation.

[0043]

First Embodiment In the first embodiment, a case will be described in which digital radio communication by the FH method is used for extension transmission of a radio communication system.

[System Configuration] FIG. 7 is a diagram showing an example of the overall configuration of a wireless communication system (hereinafter referred to as “system”) according to an embodiment of the present invention.

In the figure, 101 is an exchange, which is a public line 1.
It accommodates 02 and has a switching function and a wireless connection function. The line accommodated by the exchange 101 is not limited to the public line,
It goes without saying that a dedicated line or a digital line such as ISDN may be used.

Reference numerals 103-A and 103-B are wireless dedicated telephones, respectively, for communicating control data and voice data with the exchange 101. 104-A to 104-E are data terminal devices
Control data is communicated with the terminal 101 and data is directly communicated with the terminals. The data terminal devices 104A to 104E in the present embodiment are "a terminal (data terminal) having a function of transmitting an arbitrary amount of data in a burst and a wireless adapter that controls wireless communication between the data terminal and the main device. Is defined as the combination of The data terminal is not limited to the computer shown by reference numeral 104-A, but may be the printer 104-B, the copying machine 104-C, the video conference terminal 104-D, the facsimile device 104-E, the LAN bridge 104-F, Various terminals that perform data processing correspond to electronic cameras, video cameras, scanners, and the like, which are not shown.

A major feature of this system is that each of the above-mentioned wireless telephones and data terminal devices can freely communicate with each other, and at the same time, can access the public line network. The detailed configuration and operation will be described below.

[Structure of Main Unit] FIG. 8 is a block diagram showing an example of the structure of the main unit of the exchange 101.

In the figure, reference numeral 1 denotes a main unit, which is a main part of the present system for accommodating a plurality of outside lines and a plurality of terminals and exchanging calls between them. Reference numeral 2 is a connection device, which is a main device in order to accommodate a wireless terminal (a data terminal to which a wireless telephone or a wireless adapter described later is connected)
Under the control of 1, wirelessly control the wireless terminal,
Establishes a wireless transmission path.

Reference numeral 3 is a wireless telephone, which communicates with the outside line accommodated in the main unit 1 through the connection unit 2 and
It is a wireless terminal for mutual extension calls. Reference numeral 4 is a wireless adapter, for example, a data terminal 5 such as a personal computer or a printer 5, an SLT (single telephone) 10, a facsimile machine (FAX) 1
1. An adapter that configures a wireless data terminal by connecting to an ISDN terminal 12 and enables wireless data transmission between wireless data terminals having the same configuration.

The main unit 1 is a PSTN line 7 which is a line from a PSTN (existing public telephone network) 6 which is one of the outside lines and an ISDN (Integrated Services Digital Communication Network) which is one of the outside lines.
It accommodates ISDN line 9 which is a line from 8. next,
The internal configuration of the main device 1 will be described.

Reference numeral 201 denotes a CPU, which is the center of the main unit 1 and controls the entire main unit including exchange control. ROM202 is CPU201
The RAM 203 stores a control program, and the RAM 203 stores various data for the CPU 201 to control, and provides a work area for various calculations.

Reference numeral 204 denotes a speech path unit, which under the control of the CPU 201 controls a call exchange (time division exchange). 205 is PSTN line I / F, CP
Under the control of U201, PSTN line control such as incoming call detection to accommodate PSTN line 7, selection signal transmission, and DC loop closure is performed. 206 is an ISDN line I / F, under the control of CPU201, ISDN
It supports ISDN layers 1 and 2 for accommodating the line 9 and performs ISDN line control. 207 is SLT I / F, CPU201
Under the control of, the power supply for accommodating the SLT10, loop detection, selection signal reception, call signal transmission, etc. are performed.

Reference numeral 208 denotes a telephone section which, when energized, functions as an extension multi-function telephone under the control of the CPU 201, and when a power failure occurs.
It functions as an SLT and has a handset, dial keys, a call circuit, a display, and so on. 209 is a tone sending circuit, which is a PB
It sends out various tones such as signal, dial tone, and ring tone. twenty one
Reference numeral 0 denotes a connection device I / F, which transmits and receives a call signal and a control signal to and from the connection device 2 in order to accommodate the connection device 2 under the control of the CPU 201.

[Configuration of Connecting Device] FIG. 9 is a block diagram showing an example of the configuration of the connecting device 2.

In the figure, reference numeral 301 denotes a CPU, which is the center of the connecting device 2 and controls the entire connecting device 2 including the control of the communication channel and the radio section. 302 is a ROM in which the control program of the CPU 301 is stored, and 303 is an EEPROM for storing the calling code (system ID) of the present switching system. 304 is RAM, CPU3
01 stores various data for controlling,
Provides a work area for various calculations.

A main unit I / F 305 transmits / receives a call signal and a control signal to / from the connection unit I / F 209 of the main unit 1 under the control of the CPU 301. Reference numeral 306 denotes a PCM / ADPCM converter which, under the control of the CPU 301, AD-converts a PCM-coded call signal received from the main unit 1.
A received from the channel codec 307 while being converted into a PCM code and transmitted to the channel codec 307 described later.
Main device by converting DPCM coded speech signals to PCM code 1
Send to

A channel codec 307, under the control of the CPU 301, performs processing such as scrambling on the ADPCM-encoded speech signal and control signal, and time-division-multiplexes them into a predetermined frame. A wireless unit 308, under the control of the CPU 301, modulates the framed digital signal received from the channel codec 307, processes it so that it can be transmitted wirelessly, sends it to the antenna, and demodulates the signal wirelessly received by the antenna. And process it into a framed digital signal.

[Configuration of Radio Dedicated Telephone] FIG. 10 is a block diagram showing a configuration example of the radio dedicated telephone 3.

In the figure, reference numeral 401 denotes a CPU, which is the center of the wireless-only telephone 3, and controls the entire wireless-only telephone 3 including control of the radio section and call control. Reference numeral 402 is a ROM in which the control program of the CPU 401 is stored, 403 is a calling code (system ID) of this exchange system, and an identification number (sub
This is an EEPROM that stores ID). A RAM 404 stores various data for the CPU 401 to control and provides a work area for various calculations.

Reference numeral 405 is a call path unit, which is a call circuit for inputting and outputting a call signal between a handset 409 and a speaker 411, which will be described later, under the control of the CPU 401. Reference numeral 406 denotes an ADPCM codec which, under the control of the CPU 401, converts the analog audio signal received from the speech path unit 405 into an ADPCM code and transmits the ADPCM code to a channel codec 407 described later, and the ADPCM code received from the channel codec 407. The call signal is converted into an analog voice signal and transmitted to the call path unit 405.

A channel codec 407, under the control of the CPU 401, performs processing such as scrambling on the ADPCM-encoded speech signal and control signal, and time-division-multiplexes them into a predetermined frame. Reference numeral 408 denotes a wireless unit which, under the control of the CPU 401, modulates the framed digital signal received from the channel codec 407, processes it so that it can be transmitted wirelessly and sends it to the antenna, and demodulates the signal wirelessly received by the antenna. And process it into a framed digital signal.

Reference numeral 409 denotes a handset for inputting / outputting a voice signal for communication, 410 denotes a microphone for collecting and inputting a voice signal, 411
Is a speaker that outputs a voice signal in a loud voice. 412 is a key matrix, which is equipped with dial keys for inputting dial numbers, and function keys such as external line keys, hold keys, and speaker keys. 413 is a display unit, and a key matrix 412
Display the dialed number and external line usage entered by.

[Wireless Adapter Configuration] FIG. 11 is a block diagram showing an example of the configuration of the wireless adapter 5 connected to the data terminal device 4 that can be accommodated in the present system.

In the figure, 501 is a data terminal and 502 is a wireless adapter, both of which are connected via a communication cable or an internal bus.

Reference numeral 503 is a wireless unit. 504 is the main control unit, CP
U, a peripheral device that performs interrupt control, DMA control, and the like, an oscillator for a system clock, and the like, and controls each block of the wireless adapter 502. A communication interface unit 505 is a communication I / F that the data terminal 501 has as standard equipment, such as RS232C, RS422, SCSI, GPIB, Centronics, and LAN I / F, computer internal bus, PCMCIA I / F, etc. Corresponds to. A terminal control unit 507 controls various communication controls required when performing data communication between the data terminal 501 and the wireless adapter 502 via the communication interface unit 506.

Reference numeral 508 is a channel codec for performing frame processing and radio control, and the data assembled into a frame here is transmitted to the main device 1 and the opposite terminal via the radio unit 503. An error correction processing unit 509 is used to reduce bit errors caused by wireless communication. 510 is a timer, which provides a timing signal used by each block inside the wireless adapter 502.

FIG. 12 is a block diagram showing a configuration example of the wireless adapter 5 having a built-in MODEM (modem) required for data transmission to the PSTN 6.

In the figure, 511 is a modem for modulating data into a voice band signal, and 512 is an ADPCM codec for encoding the signal modulated by the modem. The ADPCM encoded data is assembled into a frame by the channel codec 508 and transmitted to the main device 1 via the wireless unit 503.

[Structure of Radio Unit] FIG. 13 is a block diagram showing an example of the structure of the radio unit (or radio unit unit), which is commonly used in the main unit 1, the wireless dedicated telephone 3, and the data terminal 5 of this system. It is a thing.

In the figure, reference numeral 602 designates a transmitting / receiving antenna 601.
A switch for switching between a and 601b, 603 is a bandpass filter (BPF) for removing signals in unnecessary bands, 604 is switch for switching between transmission and reception 604, 605 are amplifiers 605, 6 for receiving system
06 is a transmission amplifier with power control, 607
Is a down converter for the first intermediate frequency (1st.IF), 608 is an up converter 608, 609 is a switch for switching between transmission and reception, 610 is a BPF for removing a signal in an unnecessary band from the signal converted by the down converter 607, 611 is a down converter for the second intermediate frequency (2nd.IF). That is, the wireless unit is provided with a double conversion system reception mode by the down converters 607 and 611.

Further, a BPF 612, a 90 ° phase shifter 613, and a quadrature detector 614 are provided for the 2nd.IF signal, and the received signal is detected and demodulated. The waveform of the detected and demodulated signal is shaped by the comparator 615. In addition, the receiving system has a voltage-controlled oscillator (VCO) 6
16, low pass filter (LPF) 617, programmable counter, prescaler, phase comparator, etc.
It has a PLL 618 and constitutes a frequency synthesizer of a receiving system by these.

Further, a VCO 619 for generating a carrier signal and an LP
An F620 and a PLL 621 are provided, and these constitute a frequency synthesizer for frequency hopping. Further, a transmission system VCO 622 having a modulation function, an LPF 623, and a PLL 623 are provided, and these constitute a transmission system frequency synthesizer having a frequency modulation function.

The clock oscillator 625 is the PLL 61 described above.
A reference clock for 8,621,624 is generated, and a baseband filter 626 is a band limitation filter for transmission data (baseband signal).

[Operation of Radio Unit] (1) During Transmission Digital data TxD input to the radio unit from an external circuit such as a processor (not shown) is transmitted to the baseband filter 6
After the band is limited by 26, it is input to the modulation terminal of the VCO 622 of the transmission system. The intermediate frequency (2nd.IF) modulated wave generated by the frequency synthesizer of the transmission system is input to the up-converter 608, added to the carrier signal generated by the frequency synthesizer for hopping, and then added to the amplifier 606 of the transmission system. Is entered. At the time of transmission, the signal amplified to a predetermined level by this transmission system amplifier 606 is the BPF603.
After removing unnecessary band signals by
It is emitted to space as a radio wave from a, 601b.

(2) Upon reception The signals received by the antennas 601a and 601b are BPF603
After removing the unnecessary band signal by
It is amplified to a predetermined level by 605. Then, the received signal amplified to a predetermined level is input to the down converter 607, and is converted to the 1st.IF frequency by the signal generated by the frequency synthesizer for hopping.

The received signal converted to the 1st.IF frequency is BP
After the signal in the unnecessary band is removed by F610, the signal is input to the 2nd.IF down converter 611, and is converted to the 2nd.IF frequency by the signal generated by the frequency synthesizer of the receiving system.

The received signal down-converted to the 2nd.IF frequency is input to the 90 ° phase shifter 613 and the quadrature detector 614 after the unnecessary band signal is removed by the BPF 612. The quadrature detector 614 is a 90 ° phase shifter 613.
Detection and demodulation are performed using the phase-shifted signal and the original signal. The detected and demodulated signal is the comparator
The waveform is shaped by 615 and output to an external circuit as digital data RxD.

[Radio Frame] FIGS. 14A to 14G are diagrams showing a configuration example of a radio frame used by the present switching system. This switching system consists of "main device-wireless dedicated telephone communication frame (hereinafter abbreviated as" PCF ")", "wireless dedicated telephone communication frame (hereinafter abbreviated as" PPF ")", "burst data frame (hereinafter" BDF "). Abbreviated) are used. Hereinafter, the internal data of each frame will be described in detail.

FIG. 14A is a diagram showing a PCF, where FSYN is a synchronization signal,
LCCH-T is a logical control channel sent from the main unit 1 to the wireless dedicated telephone 3, LCCH-R is a logical control channel sent from the wireless dedicated phone 3 to the main unit 1, and T1 to T4 are dedicated to four different wireless units. Voice channels sent to the telephone 3, R1 to R4, are voice channels sent from four different radio-only telephones 3, and GT is a guard time. Also, in FIG.
In A, F1 and F3 indicate frequency channels used when wirelessly transmitting this frame, and indicate that the frequency channel is changed every time one frame is transmitted.

FIG. 14B is a diagram showing a PPF, where FSYN is a synchronizing signal,
LCCH-T is a logical control channel sent from main unit 1 to wireless dedicated telephone 3, LCCH-R is a logical control channel sent from wireless dedicated telephone 3 to main unit 1, and T1 to T3 are dedicated to three different wireless units. Voice channels to be sent to the telephone 3, R1 to R3 are voice channels transmitted from three different wireless telephones 3, GT is a guard time, and RV is a reserved bit. Further, in FIG. 14B, F1, F3, F5, and F7 indicate frequency channels used when wirelessly transmitting this frame.Unlike PCF, the logical control information LCCH- After receiving T, the frequency channel is switched to F5, which is reserved for communication between wireless dedicated telephones, and communication between wireless dedicated telephones is performed. After that, the frequency channel is switched to F3, the logical control information LCCH-T is received from the main unit 1, and the frequency channel F7 is reserved for communication between the wireless dedicated telephones.
The procedure of switching to is repeated until the communication between the wireless telephones is completed.

FIG. 14C is a diagram showing a BDF, where FSYN is a synchronization signal,
LCCH-T is a logical control channel sent from the main unit 1 to the data communication terminal, LCCH-R is a logical control channel sent from the data communication terminal to the main unit 1, R is the end of the previous frame, and other radio Carrier sense time to check if device is not emitting radio wave, PR1 is preamble, DAT
A is a data slot for accommodating burst data, and GT is a guard time.

Further, in the figure, F1, F3, F5, and F7 are frequency channels used when wirelessly transmitting this frame. After receiving the control information, the frequency channel F5 reserved for burst data communication is switched to and communication is performed between the data communication terminals. After that, the procedure of switching the frequency channel to F3, receiving the logical control information from the main device 1, and switching to the frequency channel F7 secured for burst data communication is repeated until the burst data communication is completed.

FIG. 14D is a diagram showing an FSYN frame. PR0 is a 62-bit preamble for frequency synchronization acquisition defined by the Radio System Development Center (hereinafter abbreviated as "RCR"), and SYN is defined by RCR. 31-bit frame synchronization signal, ID is specified by RCR 63
Bit calling signal, FI is 2-bit channel type signal for distinguishing PCF and PPF, TS is time slot information, NFR
Indicates frequency information of the next frame. Also, the numerical values shown in the figure indicate the number of bits in this embodiment.

FIG. 14E is a diagram showing a frame of an audio channel. Since the configurations of T1 to T4 and R1 to R3 are common, the audio channels for transmission are collectively indicated as Tn, and the audio channels for reception are collectively represented as Rn. Is displayed. Also, the configurations of Tn and Rn are common. In the figure, R is a carrier sense time for confirming that the previous frame has ended and whether another wireless device is emitting radio waves, PR1 is a preamble for each slot, and UW is a unique ID including a sub ID. Word, D is 3.2kbps
D channel information, B represents 32 kbps B channel information, and GT represents guard time. Also, the numerical values shown in the figure indicate the number of bits in this embodiment.

FIG. 14F is a diagram showing the frame structure of the logical control channel LCCH-T. LCCH-T is a logical control channel sent from the main unit 1 to the wireless telephone 3. In the figure, UW represents a unique word including a sub ID, LCCH represents logical control information, and GT represents guard time. Since LCCH-T is sent continuously after sending FSYN, no preamble is added.

FIG. 14G is a diagram showing the frame structure of the logical control channel LCCH-R, where LCCH-R is the logical control channel sent from the radio dedicated telephone 3 to the main unit 1. In the figure, R is the time of carrier sense for confirming that the nth previous frame has ended and whether other wireless devices are emitting radio waves, PR1 is the preamble for each slot, UW is the sub ID Unique word included, LCCH represents logical control information, and GT represents guard time.

[Channel Codec] FIG. 15 is a block diagram showing a configuration example of a channel codec for disassembling and assembling the above-mentioned frames. The channel codec 801 shown in the figure is arranged between the ADPCM codec 803 and the wireless section 802 built in the connection device 2, the wireless dedicated telephone 3, the wireless adapter 4, etc., and controls the devices.
Connected to The channel codec is supplied as an ASIC.

Inside the channel codec 801, 805
The wireless control unit has a function of performing transmission / reception switching control and frequency hopping control with respect to the wireless unit 802, and further performing carrier detection prior to data transmission. 807 is CPU
I / F for exchanging control information with CPU804
It is an I / F and has built-in registers that store the status and operation mode of each part in the ASIC.
Controls each part of ASIC according to the state of each part.

806 is an ADPCM codec I / F, which is ADPCM
It transmits and receives serial data and a synchronous clock for exchanging audio signals with the codec 803. Reference numeral 808 denotes a transmission frame processing unit, which receives a signal input from the ADPCM codec 803 and logical control data input from the CPU 804.
Assemble into the transmission frame described above. Reference numeral 809 denotes a received frame processing unit, which controls the control information and voice data extracted from the signal frame input from the wireless unit 802 to the ADPCM codec I / F.
Pass it to the 806 or CPU I / F 807.

Reference numeral 810 denotes a synchronization processing unit, which is composed of DPLL, reproduces a clock from a received signal, and captures bit synchronization.

The basic operation of the above ASIC will be described below.

(1) At the time of transmission First, the control information to be added to the transmission data frame is received from the CPU 804 via the CPU I / F 807. In the case of the ASIC used for the wireless telephone 3 or the connection device 2, the transmission frame processing unit 8 together with the data from the ADPCM codec 803 is used.
Assemble the transmission frame at 08. In the case of the ASIC used in the data terminal 5, the transmission frame processing unit 808 assembles the transmission frame together with the burst data that has been error-correction coded. When assembling this frame, the data is scrambled. This is necessary to maintain DC balance during wireless transmission. Wireless controller 80
5 waits for the timing at which the received signal ends and, after carrier sensing, switches the radio unit 802 to transmission and passes the transmission frame to the radio unit 802.

(2) Upon reception The radio control section 805 switches the radio section 802 to reception when transmission of the transmission data ends, and waits for a reception frame. When the received frame is received, it is descrambled and then the control information and data are extracted from the received frame. The fetched control information is passed to the CPU 804 via the CPU I / F 807. When the received frame is PCF or PPF, the received data is ADPCM
The data is passed to the codec I / F 806, is output as voice through the ADPCM codec 803 in the case of the ASIC used for the wireless dedicated telephone 3, and is sent to the speech path unit 204 in the case of the ASIC used in the connection device 2. If the received frame is BDF,
The received data is transferred to the memory in the data terminal 5.

(3) Handling of logic control data ● During no communication During a non-communication time, the LCCH-T periodically waits at the frequency assigned by the main unit 1 and is periodically sent from the main unit 1.
To receive. This LCCH includes information such as whether or not there is an incoming call to the outside line and whether or not there is a call request to the wireless telephone 3 side. Then, the wireless telephone 3 sends the LCCH extracted by the received frame processing unit 809 to the CPU 804. After that, the LCCH sent from the CPU 804 to the main device 1 is sent to the main device 1 by LCCH-R in the same frame. in this way,
The wireless telephone 3 repeats the above procedure until a call or an incoming call occurs.

During Communication An example will be described in which one of the wireless telephones 3 makes a call. The wireless telephone 3 uses the frequency channel F during no communication.
It is assumed that LCCH is exchanged with the main device 1 at 1.

The wireless telephone 3 is used until a call is made.
The LCCH from the main device 1 is monitored on the frequency channel F1 according to the procedure described in the above “when not communicating”. Then, when a call originates at the wireless telephone 3, the call request is put into the LCCH-R to be sent to the main device 1 and sent to the main device 1 by the procedure described in the above-mentioned “when not communicating”. The LCCH for notifying whether communication is possible from the main device 1 side is determined by the LCCH sent on the frequency channel F1 after 100 ms.

When the content of the LCCH from the main unit 1 after the call request indicates that the line is blocked and the connection cannot be established, the wireless telephone 3 informs the user that the line is busy. However, if the content of the LCCH from the main device 1 after the call request indicates that connection is possible, the time slot of the voice channel used for a call is specified within the same LCCH-T. For example, when "1" is specified, it indicates that communication is performed using T1 and R1. Then, communication is performed while switching frequency channels according to the frequency hopping pattern specified by FS and NFR in the FSYN frame. Main device
The exchange of control information after connecting to 1 is performed by the D channel information in the Tn and Rn frames.

In the case of communication between wireless dedicated telephones, control information is exchanged between wireless dedicated telephones using D channel information. After the end of communication, each wireless dedicated telephone 3 LCCH-R of the designated frequency channel, in the above example,
The main unit 1 of the wireless-only telephone 3 indicates that the communication between the wireless-only telephones has been completed by the frequency channel F1 during non-communication.
Notify to

[Frequency Hopping Pattern] FIG. 16 is a conceptual diagram of frequency hopping used in this system.

The present system uses 26 frequency channels with a width of 1 MHz by utilizing the 26 MHz band which is approved for use in Japan, for example. Considering the case where there are frequencies that cannot be used due to jamming radio waves or noise, select 20 frequency channels from 26 channels, move the selected frequency channels in a predetermined order, and perform frequency hopping. . In this switching system, one frame has a length of 5 ms and hops the frequency channel every frame. Therefore, one cycle of one hopping pattern is 100 ms.

FIG. 16 shows different hopping patterns with different patterns. In this way, hopping patterns should be set so that each frame of PCF and PPF does not use the same frequency at the same timing. As a result, it is possible to prevent the occurrence of data error due to mutual interference. When accommodating a plurality of connecting devices 2, different connecting devices 2 use different hopping patterns in order to prevent interference between the connecting devices. With this method, a system having a multi-cell configuration can be realized and a wide service area can be obtained.

[Details of Main Device-Connecting Device Interface] FIG. 17 is a block diagram showing a detailed configuration example of the main device-connecting device interface.

In the main unit side of the figure, 1401 is a CPU,
It controls the exchange unit and controls communication with the connection device 2. A gate array (GA) 1402 supplies a synchronization signal and a clock to the ADPCM CODEC 1404. Reference numeral 1403 is a speech path unit, which controls exchange of time slots of PCM signals by the synchronization signal and the clock supplied from the GA 1402. 1404
Is an ADPCM CODEC, which converts a multiplexed ADPCM signal input from the transmission unit 1405, which will be described later, into a PCM signal, and based on the synchronization signal supplied from the GA1402, puts the PCM signal in a predetermined time slot to make a call path. While outputting to the section 1403,
The PCM signal is input from the communication path unit 1403 based on the above synchronization signal, predetermined compression is performed, and the multiplexed audio data is output to the transmission unit 1405. 1405 is a transmission unit, which receives serial data from the connection device 2, separates the received data into audio data and control data based on a synchronization signal included in the received data, and outputs the separated audio data to the ADPCM CODEC 1404, Separated control data is output to CPU1401 and control data input from CPU1401 and ADPCM CODEC
The audio data input from 1404 is assembled into a predetermined frame and output.

Further, the transmission unit 1405 supplies electric power to the connection device 2 in order to drive the connection device 2. A control data bus 1406 is a bus for the CPU 1401 to transmit various control data to each unit. 1407 is a cable, the main device
Data is transmitted and received between 1 and the connection device 2, and power is supplied from the main device 1 to the connection device 2.

On the connection device side of FIG. 17, 1408 is
The CPU controls data transmission / reception between the wireless-only telephone 3 and the main device 1. A transmission unit 1409 receives data from the main device 1, decomposes the received data, outputs an ADPCM signal multiplexed on a channel CODEC 1410 described later, and outputs a control data signal to the CPU 1408. Further, the transmission unit 1409 assembles the multiplexed ADPCM signal input from the channel codec 1410 and the control data signal input from the CPU 1408 into serial data and outputs the serial data to the main device 1. 1410 is a channel CODEC, the data received from the wireless unit 1411, based on the synchronization signal included in the received data, is separated into audio data and control data, and outputs the separated audio data to the transmission unit 1409, The separated control data is output to the CPU 1408. In addition, the channel CODEC14
10 is the control data input from the CPU 1408 and the transmission unit 140.
The voice data input from 9 is assembled into a predetermined frame and output to the wireless unit 1411. 1413 is a power supply unit, which is the main unit 1
The voltage required for the operation of the connection device 2 is supplied by the power supplied from the device. A control data bus 1412 is a bus for the CPU 1408 to send various control data to each unit.

[Transmission / reception of control data] Next, the CPU 1401 in the case of using the interface between the main device and the connection device shown in FIG.
The transmission / reception of control data between the channel CODEC 1410 and the channel CODEC 1410 will be described in detail.

(1) At start-up When the system is started up, the CPU 1401 detects that the control data bus 1
Control data for instructing a frequency scan to determine the hopping pattern is transmitted to the connection adapter 2 via 406 and the transmission unit 1405. The transmission unit 1409 of the connection adapter 2 outputs the received control data to the CPU 1408. Based on the received data, the CPU 1408 sets the wireless unit 1 for the channel CODEC 1410.
It outputs an instruction to the 411 to scan an empty channel. The channel CODEC 1410 which received the instruction is transmitted to the wireless unit 141.
Causes 1 to scan an empty channel at a predetermined frequency. Then, when the channel CODEC 1410 receives the analog level RSSI signal, the channel CODEC 1410 compares the scan result with a predetermined threshold value, and when the scan result is less than or equal to the threshold value, stores the result in an internal register. Next, the same process is performed for all frequencies while changing the frequency, and when this process ends, CPU1
Notify 408 that the scan of the free channel is completed.

The CPU 1408, which receives the notification of the end of scan,
The free channel can be known by reading the register of the channel CODEC1410 that stores the free channel information. After that, the CPU 1408 notifies the CPU 1401 on the main device side of the empty channel information via the transmission units 1409 and 1405.

Upon receiving the free channel information, the CPU 1401
The hopping frequency is determined based on the received empty channel data, and the frequency information, control data, and system ID information are notified to the CPU 1408 via the transmission units 1405 and 1409.
Upon receiving this notification, the CPU 1408 writes the hopping frequency information in the register of the channel CODEC1410. Based on the information written in the register, the channel CODEC 1410 is connected to the wireless unit 141.
Controls 1 to perform hopping and starts transmitting control data, system ID, etc. to the wireless terminal accommodated in the extension.

Then, after transmitting the control data via the radio section 1411, the response signal from the extension radio terminal is sent to the channel CODE.
When the C1410 receives the channel CODEC1410, the radio section 1411
From the wireless terminal ID (sub I
D) and wireless terminal type information are extracted and notified to the CPU 1408. Upon receiving the information, the CPU 1408 sends the wireless terminal ID and the terminal type information to the main device 1 via the transmission units 1409 and 1405.
Notify the CPU 1401 on the side. The CPU 1401 stores the notified wireless terminal ID and wireless terminal type in an internal register or the like.

The CPU 1401 on the main unit 1 side repeats the above processing to recognize (store) the wireless terminal IDs and wireless terminal types of all extension terminals, and then, based on the stored wireless terminal types,
Send control data. Note that the wireless terminal type is transmitted on the LCCH-R, but it may be always placed on the FSYN on the frame.

(2) Standby CPU 1401 transmits control data including control information and transmission count information of control information to the transmission unit 1405 based on the stored terminal type accommodated in the extension of the connection device 2. To do. Transmission unit
The 1405 temporarily stores the received data in a buffer. This control data is transmitted by the transmission unit 1409 on the connection device 2 side.
To, for example, by a serial two-wire cable, it is transmitted as burst data with a cycle of 8 KHz.

The control data transmitted from the transmission unit 1405 is
It is received and decomposed by the transmission unit 1409 on the connection device 2 side, and taken into the CPU 1408 at a predetermined timing. Based on this control data, the CPU 1408 sets the control information and the control information transmission count information to be added to the transmission data frame to the CPU I / I shown in FIG.
Send to F807.

When the received data is the control data to be sent to the wireless terminal or the like, the CPU I / F 807 sends the control data to the transmission signal frame processing unit 808 and incorporates it in the frame such as LCCH-T and the specified number of times. Data is transmitted to the wireless unit 1411 based on the information.

If the received data is control data for controlling the radio section 802, the CPU I / F 807 sends the received data to the radio control section 805 shown in FIG. Upon receiving this data, the wireless control unit 805 sets the wireless unit 802 in a transmission state at a predetermined timing, and performs intermittent transmission and normal transmission. When this transmission ends, the transmission frame processing unit 808 shown in FIG. 15 outputs an end signal to the wireless control unit 805. Upon receiving the end signal, the wireless control unit 805 switches the wireless unit 802 to the reception mode and performs reception from the wireless terminal.

Receiving frame processing section 809, which has received the signal received by radio section 802, descrambles the received signal and synchronizes the descrambled received signal with synchronization processing section 810.
Output to The synchronization processing unit 810 checks the synchronization signal and the ID, determines whether to receive the frame,
When it is determined that the received frame cannot be received, the received frame processing unit 80
It outputs a signal to 9 to discard the received frame.

If the synchronization processing unit 810 determines that reception is possible, the synchronization processing unit 810 outputs a signal instructing the received frame processing unit 809 to disassemble the received frame. The reception frame processing unit 809 that receives this instruction signal extracts the LCCH-R and outputs it to the CPU I / F 807. The CPU I / F 807 outputs the received control signal to the CPU 1408. After that, after receiving a signal from the wireless terminal for a predetermined time and processing the received signal by the received frame processing unit 809, when the received signal ends, the CPU 80
4 notifies the wireless controller 805 of the end of the received frame. Upon receiving this notification, the wireless control unit 805 controls the wireless unit 802 to be in a standby state and further to be in a sleep state.

Upon receiving the control data, the CPU 1408 outputs the control data to be sent to the main device 1 corresponding to the control data to the transmission section 1409 at a predetermined timing. Receiving this control data, the transmission unit 1409 transmits this control data to the transmission unit 1405 on the main device 1 side as burst data having an 8 KHz cycle.

(3) During a call At the time of a call, control data from the CPU 1401 and voice data from the ADPCM CODEC 1404 are transmitted to the transmission unit 1405 in synchronization with the sync signal.
Is input to The transmission unit 1405 is the transmission unit 1409 of the connection adapter 2.
Burst transmission of the input voice data is performed between and. This transmission has a maximum of 4 channels, uses a two-wire cable, and has a transmission rate of 128 kbps (one direction).

The transmission unit 1409 of the connection adapter 2 decomposes the received data and synchronizes with the synchronization signal to generate the channel CODEC1410.
Output to Further, the received control data is taken into the CPU 1408 at a predetermined timing. The CPU 1408 transmits control information to be added to the transmission data frame to the CPU I / F 807 based on the received control data. If the received data is control data to be sent to the wireless terminal, the CPU I / F 807 sends the control data to the transmission frame processing unit 808, and the LCCH-T
And put it on the frame.

If the received data is data for controlling the radio section 802, the CPU I / F 807 sends the received data to the radio control section 805. Upon receiving this data, the wireless control unit 805 puts the wireless unit 802 into a transmission state at a predetermined timing.

At the same time, the ADPCM codec I is transmitted from the transmission unit 1409.
When the audio data is transmitted to / F806 in synchronization with the synchronization signal, the CPU 1408 takes in the audio data at a predetermined timing and transmits it to the transmission frame processing unit 808. Upon receiving the voice data, the transmission frame processing unit 808 places the voice data on the time slot indicating the transmission destination based on the control data of the CPU 1408.

As described above, the transmission frame processing unit 80
The transmission frame including the control data and the voice data assembled in 8 is scrambled and is output to the wireless unit 802 at a predetermined timing based on the control signal of the CPU 1408. When the transmission is completed, the transmission frame processing unit 808
Outputs an end signal to the wireless controller 805. Upon receiving the end signal, the wireless control unit 805 switches the wireless unit 802 to the reception mode.

Upon receiving the received signal from radio section 802, received frame processing section 809 descrambles the received signal and synchronizes the descrambled received signal with synchronization processing section 810.
Output to The synchronization processing unit 810 checks the synchronization signal and the ID, determines whether to receive the frame,
When it is determined that the received frame cannot be received, an instruction signal for discarding the received frame is output to the reception frame processing unit 809.

If the synchronization processing unit 810 determines that the received frame can be received, the synchronization processing unit 810 outputs an instruction signal for decomposing the received frame to the received frame unit 809. Upon receiving this signal, the reception frame processing unit 809 extracts the LCCH-R and outputs the CPU I / F.
Output to 807. The CPU I / F807 sends the received control signal to the CPU.
Output to 1408. Also, the audio data decomposed and taken out by the reception frame processing unit 809 is ADPCM codec I / F.
The data is transmitted to the transmission unit 806 and is output to the transmission unit 1409 at a predetermined timing based on the control data from the CPU 1408.

When the above reception processing is completed, the CPU 1408
Sends a reception frame end notification to the wireless controller 805. Upon receiving this notification, the wireless control unit 805 outputs instruction data for switching the reception frequency to the wireless unit 802 based on the control data from the CPU 1408.

(4) Operation Timing FIG. 18 is a diagram showing an example of the timing of transmitting the control information from the connection device 2 to the wireless terminal in the standby state. D1 indicates that there is no control request from the main device 1 and the terminal. , D2 is control data indicating that there is an incoming call, D3 is control data indicating connection confirmation, and D4 is control data during a call. In the following, as an example, a case where mobile terminals are connected to extensions 1 and n and semi-fixed telephones are connected to extensions 2 and 3 shown in FIG. 18 will be described.

The connection device 2 sends D1 indicating that there is no call request from the main device 1, especially from the extension line or from the outside line, during the frame period T1 to the extension line 1, extension line 2,
Extension 3, ..., Extension n in this order, reference numerals 1501,1503,1507,151
It is output at the predetermined timing indicated by 1. In addition, the connection device 2
Receives a command from the main unit 1 to write data to the extension 1 and the extension n once every two frame periods, and writes D1 to the channel CODEC 1410 at that timing. At this time, the channel CODEC 1410 may transmit D1 every frame period, or may transmit D1 once every two frame periods.

By the frame cycle T2, the connection device 2 has the extension 2
When a control command for notifying an incoming call to the main device 1 is received, D2 is transmitted to the extension 2 at the timing indicated by reference numeral 1504. Also, for extension 3 every frame period T
Send D1.

When the connection device 2 receives the connection confirmation signal for the response from the wireless terminal from the main device 1 by the frame cycle T3, the connection device 2 sends D3 to the extension 2 at the timing indicated by reference numeral 1505.
To send a connection confirmation signal. Further, the standby information D1 received from the main device 1 is transmitted to the extension 1 at the timing indicated by reference numeral 1502 and to the extension 3 at the timing indicated by reference numeral 1509. Further, D2 indicating that there is an incoming call is transmitted to the extension n at the timing indicated by reference numeral 1512.

By the frame cycle T4, the connection device 2 has the extension 2
When a signal indicating that the call has been established is received from the main device 1, D4 is transmitted to the extension 2 at the timing indicated by reference numeral 1506, and thereafter, a call using the time slot is performed. Also, D2 indicating that there is an incoming call to extension 3 is transmitted at the timing indicated by reference numeral 1510.

FIG. 19 is a diagram showing a timing example in the case where the wireless terminal performing the intermittent reception makes a call to shift from the intermittent reception mode to the calling mode. The intermittent reception cycle using the frequency F1. Is set to 3T (300 ms), D5 indicates control data indicating outside line transmission permission, and D6 indicates control data including outside line information.

Connection device 2 which has received standby information from main device 1
However, reference numeral 1604 indicates that there is a call origination request from the extension n before transmitting control information to the next wireless terminal after transmitting D1 at the timing indicated by the reference numeral 1601 to the extension n. When notified from the main device 1 at the timing, the connection device 2 uses the predetermined frame of the next frame period instead of the frame period of the intermittent reception, based on the control information from the main device 1, to the extension n. A transmission permission signal is transmitted by D5 at the timing indicated by reference numeral 1602. Then, the external line information is transmitted to the extension n at the timing indicated by reference numeral 1603 by D6, and the intermittent reception mode is switched to the call setting mode.

By repeating the above processing, transmission / reception with the wireless terminal is performed by the interface between the main device and the connection device shown in FIG.

The transmission unit of this embodiment is composed of, for example, a pulse transformer and a ping-pong transmission LSI that performs transmission in a predetermined burst cycle using PSK or AMI as a transmission code. Alternatively, the HDLC controller can be used for data transmission.

[Description of Detailed Operation] As described above, in the present system, frames are assembled for communication between the main device 1 and the wireless-only telephone 3 or the data terminal 5, and for communication, and Control is performed to switch the frequency to be used at regular intervals. The specific operation of this system will be described in detail below.

(1) Basic operation procedure In this system, before using the communication channel,
It is characterized by using the logical control channels (LCCH-T and LCCH-R) that are time-division multiplexed in the frame to determine the slot to use and the hopping pattern. Further, in order to allow each terminal to perform intermittent reception to save power (battery saving), each terminal is designed to perform transmission and reception only on a logical control channel that transmits at a frequency assigned in advance. .

However, since the terminal does not recognize the hopping pattern immediately after the power is turned on, it waits at an arbitrary frequency and receives a frame at that frequency. When the first frame is received, the transmission frequency information of the next frame is read from that frame, and thereafter, this is repeated to start frequency hopping. In addition, a plurality of connection devices 2
Is used, it follows the hopping pattern used by the connecting device 2 that was able to receive the frame for the first time.

Immediately after the power is turned on, which radio telephone 3 is assigned to which frequency is not determined. Therefore, at power up, in the setting mode,
The identification number (sub ID) of each terminal is registered and the logical control channel frequency is assigned.

When the logical control channel is assigned, each terminal enters the intermittent reception state and receives only the logical control data addressed to itself. Also, usually the LC of the assigned frequency
Always use CH-R to send your own sub-ID to main unit 1, and if there is data to be sent from wireless phone 3, use LCCH-R to send the main data. Send to device 1.

When it is desired to start the communication using the call slot, it is necessary to notify the main device 1 of that fact using the logical control channel and be assigned with the slot and the hopping pattern. After they are assigned, it becomes possible to make a call or perform pattern transmission.

The detailed operation of some cases will be described below.

(2) Power-on operation of the main unit 1 and wireless terminal (setting mode) The setting mode is a mode in which the sub ID of the wireless terminal is registered and the frequency of the logical control channel to be used is set. , Fig. 20 is a sequence diagram showing an example of power-on operation during special operation, Fig. 21 is a sequence diagram showing an example of power-on operation during normal operation, and Fig. 22 is an operation upon power-on of main device 1 (connection device 2) FIG. 23 is a flowchart showing an example, and FIG. 23 is a flowchart showing an operation example when the power of the wireless terminal is turned on.

Operation at Power-On of Main Device 1 (Connecting Device 2) First, when the power switch of the main device 1 main body is turned on, the main device 1 performs initial setting in step S2201 shown in FIG. PC with the hopping pattern (frequency hopping in the next unit time) determined in step S2203 and the system ID of this system determined in step S2203
Send the F frame to the wireless terminal. Here, the system ID is included in the ID part of the PCF frame shown in FIG.14D, the frequency information for hopping in the next unit time in the hopping pattern is included in the NFR part, and the LCCH part shown in FIG.14F is wireless. Includes information on an empty control channel that can be used in communication of control information with the terminal.

Next, in step S2204, main apparatus 1 receives from the wireless terminal the system ID, the sub ID of the wireless terminal, and the like.
Waiting to receive the information for location registration, when these are received, in step S2205, the received sub ID is stored in the RAM 203, the control channel for transmitting the wireless communication control information addressed to the wireless terminal is determined, and the step The control channel determined in S2206 is notified to the wireless terminal (2003 shown in FIG. 20 or 2103 shown in FIG. 21).

Operation at Power-on of Wireless Terminal First, when power is turned on by turning on the power switch of the wireless terminal body (or by connecting the AC adapter to an outlet), start-up at step S2301 shown in FIG. Detect the state of. For example, when the power is turned on while pressing a plurality of predetermined keys (special operation), the wireless terminal
In S2302, the main body is initialized, the sub ID of the wireless terminal is keyed in, and the input sub ID is stored. It should be noted that it is possible not to shift to the sub ID input mode unless a predetermined password is keyed.

If the startup is not a special operation (special startup), the startup process is performed in step S2309 to check whether the system ID and terminal ID stored in step S2310 are normal. And remembered ID
If it is detected that there is an abnormality in the contents of step S2,
The error notification processing is performed in 311 and the user is requested to restart. The error notification process is performed by the display unit of the wireless terminal.
A message for requesting restarting is displayed on 413 and an alarm is sounded.

On the other hand, if it is determined that the stored ID is normal, or if special startup is performed, step S230
In 3, in order to receive the PCF frame from the main device 1, it enters a reception standby state at an arbitrary frequency, and when the PCF frame is received in step S2304, the system ID is recognized from the ID part in the PCF frame in step S2305. Remember and LCCH
Acquiring free channel information (frequency at which a PDF frame is transmitted from the wireless terminal to the main device 1) from the department. Then, step
In S2306, the frequency hopping in the next unit time is acquired from the NFR part in the PCF frame, the reception frequency is moved to the acquired frequency, and the next PCF frame is waited for. Then, the wireless terminal repeats this operation to recognize and store the frequency hopping pattern.

When the hopping pattern and the system ID are known, the wireless terminal, in step S2307, adds the system ID, the ID information of the own device, and the type information of the own device to the idle control channel obtained by the LCCH unit. Main unit is the frame (2002 shown in FIG. 20 or 2102 shown in FIG. 21)
Send to 1.

Thereafter, the wireless terminal, in step S2308,
When the control channel designation information is received from the main device 1, the reception is started on the designated control channel and the setting mode is shifted to the normal mode. At this time, in the case of a wireless terminal that uses an AC power source, such as a semi-fixed telephone or a wireless adapter, the control information from the main device 1 is constantly monitored. In the case of a mobile terminal such as a mobile phone that uses a battery, the control information from the main device 1 is received by intermittent reception at predetermined intervals.

Processing at the time of making an outside line from a wireless terminal FIG. 24 is a sequence diagram of making an outside line, FIG. 25 is a flowchart showing an operation example of the main unit 1 at the time of making an outside line, and FIG. It is a flow chart which shows an example of operation.

When the outside line key arranged in the key matrix 413 of the wireless terminal is pressed in step S2501 shown in FIG. 26, for example, the red LED of the display unit 414 corresponding to the pressed outside line key is transmitted and blinks, In S2503, Fig. 24
An external line transmission signal indicated by reference numeral 2402 is sent to the connection device 2. This external line transmission signal is transmitted on the LCCH-R of the PCF frame on the wireless link between the wireless terminal and the connection device 2, and the main device I / F 305 of the connection device 2 notifies the main device 1 as an external line transmission 2401.

In step S2601 shown in FIG. 25, the outside line transmission 2401
The main device 1 having received the message judges whether or not the outside line can be transmitted, and if the outside line is available and the line can be transmitted, the step S260 is performed.
Which voice channel (T1
~ T4, R1 ~ R4) is used as a parameter to transmit an outside line transmission permission 2403 to the connection device 2, and the connection device 2 transmits an outside line transmission permission signal 2404 to the wireless terminal. The outside line transmission permission signal 2404 is transmitted by LCCH-T of the PCF frame.
Next, main device 1 acquires an outside line in step S2603.

When the wireless terminal receives the outside line transmission permission signal 2404 in step S2504, it synchronizes with the voice channel designated by the parameter sent by this permission signal, and thereafter, the voice signal is transmitted on this voice channel. To communicate. Specifically, the voice data is communicated in the B time slot shown in FIG. 14E. And wireless dedicated phone 3
When the transition to the voice channel is completed, the step S250
At 5, the LCCH-R transmits the voice channel connection completion signal 2406.

The connection device 2 permits the outside line transmission from the main device 1 24.
When 03 is received, a predetermined voice channel is received by the channel codec 307, a path for passing the received signal to the main device 1 is formed, and the voice channel connection completion signal 2406 from the wireless telephone 3 is transmitted to the voice channel. The main device 1 is notified as a connection completion 2405. When the main device 1 receives the voice channel connection completion 2405 in step S2604, it determines that the wireless terminal side is ready, and in step S2605, in order to turn on, for example, the green external line LED of the wireless terminal, the connection device 2 is connected. The outside line display green constant light instruction 2407 is transmitted, and the outside line captured in step S2606 is connected to the communication path.

On the other hand, when the wireless terminal receives the outside line display green constant light instruction signal 2408 from the connection unit 2 in step S2506, it turns on the green outside line LED, and in step S2507 connects the communication path inside the wireless terminal and dial tone. Listen to 2411. The outside line display red constant light instruction signal 2410 is also transmitted to another wireless terminal in order to light the corresponding red outside line LED of the other wireless terminal. Next, the wireless terminal which receives the dial operation from the key matrix 413 transmits a dial signal 2413 to the connection device 2 in step S2508. Step S2509
Then, the end of this dial operation is monitored by a time-out (TO), and when the time-out is reached, a call is made in step S2510.

The main unit 1 dials 2412 in step S2607.
When the first digit is received, a dial signal is started to be transmitted to the outside line, and in step S2608, the end of dial transmission is monitored by a timeout. When the dial transmission is completed, the call is established in step S2609.

When the call ends and the wireless terminal goes on-hook at step S2511, an on-hook signal 2416 is sent to the connection adapter 2 at step S2512. Then, step S2610.
The main device 1, which received the on-hook 2415 in step S2611.
Sends a voice channel disconnection 2417 to the connection device 2 and cancels the assignment of the voice channel to the wireless terminal. After that, in step S2612, the main device 1 turns off the red line LED of the wireless terminal.
To the connection device 2, and the connection device 2 transmits an outside line display turn-off instruction signal 2420.

In step S2513, the voice channel disconnection signal 2
Upon receiving 418, the wireless terminal releases the call path and performs step S
In 2514, when the outside line display turn-off instruction signal 2422 is received, the corresponding red outside line LED is turned off. The outside line display turn-off instruction signal 2422 is a red outside line corresponding to another wireless terminal.
It is also sent to other wireless terminals to turn off the LED.

[Processing when an external line arrives at a wireless terminal] FIG. 27 is a sequence diagram of an external line incoming, FIG. 28 is a flowchart showing an operation example of the main device 1 when an external line is incoming, and FIG. 29 is an operation of a wireless terminal when an external line is incoming. It is a flowchart which shows an example.

When the main device 1 determines in step S2801 shown in FIG. 28 that an incoming call (2701) has been received from an outside line, it sends outside line incoming calls 2702 and 2704 to the connection device 2 in step S2802, and the connection device 2 sends an outside line to the wireless terminal. Sends incoming signals 2703 and 2705 (outgoing line incoming call). Then, when the off-hook 2707 is received in step S2803, the outside-line response permission including the information such as the HP and the voice channel number used for the outside-line call is sent to the wireless terminal that transmitted the off-hook signal 2706 in step S2804.
08 is transmitted to the connection device 2, and the connection device 2 transmits an outside line response permission signal.
2709 is transmitted to the wireless terminal. The outside line transmission permission condition at this time is the same as that of the outside line transmission described above.

Subsequently, when the voice channel connection completion 2711 is received in step S2805, a call display instruction is transmitted to the connection device 2 in step S2806, and the connection device 2 transmits a call display instruction signal 2713 to the wireless terminal. Next, step S2807.
Then, the external line incoming call stop 2716 addressed to the other wireless terminal is transmitted to the connecting device 2, and the connecting device 2 transmits the external line incoming call stop signal 2717 to the other wireless terminal. Then, in step S2808, based on the data from the wireless terminal, the wireless terminal is connected to an outside line and a call is started. In addition, at this time, it is talking as data 2714, 271
5 are exchanged.

Further, the main unit 1 maintains the connection between the wireless terminal and the outside line until it receives the on-hook 2719 from the wireless terminal in step S2809. When receiving the off-hook 2719, the process proceeds to step S2810, disconnects the wireless terminal from the outside line, and disconnects the voice channel 2720 addressed to the wireless terminal from the connection device 2
Then, in step S2811, an outside line busy display stop 2722 addressed to the wireless terminal is transmitted to the connection device 2.

When the wireless terminal receives an outside line incoming signal 2703 from the connection device 2 in step S2901 shown in FIG. 29, it sounds a ring tone or the like and detects in step S2902 whether or not it is off-hooked. And step if off-hook
In step S2903, the off-hook signal 2706 is transmitted to the connection device 2, and in step S2904, the connection device 2 transmits an outside line response permission signal 27.
When 09 is sent, the voice channel is connected and the voice channel connection completion signal 2710 is transmitted in step S2905.

Then, the wireless terminal, in step S2906,
When the display instruction signal 2713 during a call is received, the display unit 414
Is displayed during the call, and the call is started in step S2907. Then, the call state is maintained until the on-hook is detected in step S2908, and the step is detected when the on-hook is detected.
In S2909, the on-hook signal 2718 is transmitted to the connecting device 2.
Next, in step S2910, when the voice channel disconnection signal 2721 is received, the voice channel is disconnected, the in-call display on the display unit 414 is erased, and the call is ended. The call display is canceled according to the outside line display stop signal 2723.

On the other hand, when the wireless terminal receives the outside line incoming call stop signal 2717 in step S2911 because another wireless terminal started a call before being off-hooked in step S2902, it uses the outside line on the display unit 414 in step S2912. Display the inside. Further, in step S2913, an outside line busy display stop signal 2
Until the 723 is received, the external line in use is continuously displayed on the display unit 414, and when the external line in use display stop signal 2723 is received, the step
Turn off the outside line in use display in S2914.

Processing of Extension-to-Extension Call Next, when the communication with the main device 1 is managed by the same connection device 2, the connection device 2 that mediates the communication is the same, The operation of each of the calling side wireless terminal and the called side wireless terminal will be described in the case where two wireless terminals make an extension call.

FIG. 30 is a sequence diagram of each device during extension communication, FIG. 31 is a flow chart showing an operation example of the main device 1 during extension communication, and FIG. 32 is an operation example of the originating wireless terminal during extension communication. FIG. 33 is a flowchart showing an operation example of the called-side wireless terminal at the time of extension communication, but only relevant processing portions are described in each flowchart.

One of the wireless terminals (FIG. 30 shows a wireless-only telephone)
(Indicated by A), when the extension key arranged in the key matrix 413 is pressed in step S3201 shown in FIG. 32, the extension communication signal 3002 shown in FIG. 30 is transmitted between the wireless telephone A and the connection device 2 in step S3202. PCF frame LCC over wireless link
Send by HR. When the connection device 2 receives the extension communication signal 3002, the connection device 2 notifies the main device 1 of the extension communication 3001.

The CPU 201 of the main device 1 executes step S shown in FIG.
When the extension communication 3001 is received in 3101, in step S3102,
If the extension can be transmitted by analyzing the terminal attributes of the wireless telephone A that has transmitted it, in step S3104, the extension communication permission 3003 using the LCCH-T of the PCF frame is set to the connection device 2
To the wireless telephone A. If there is no available communication resource such as a voice channel and extension cannot be made, an extension communication impossible notification is transmitted in step S3103.

Upon receiving the extension communication permission signal 3004 in step S3203, the wireless telephone A receives the dial information received from the key matrix 413 in step S3204.
It is transmitted to the main device 1 as 008. The last dial is monitored by timeout.

Main device 1 dials 3007 in step S3105.
When receiving, the dial is analyzed in step S3106,
If it is determined that the wireless terminal of the extension communication destination (indicated by the extension-only telephone B in FIG. 30) can communicate, the PCCH frame LCCH-T is sent to the extension-only telephone B via the connection device 2. Send the incoming extension 3009.

In step S3301 shown in FIG. 33, the extension incoming signal 3
Receiving 010, the wireless telephone B informs the user of the incoming call through the speaker 411 or the like in step S3302 to prompt the user for a response, and waits for the user to respond with the key matrix 413 in step S3303. When the user's response is detected, the off-hook signal 3012 is sent to the LCCH-R of the PCF frame in step S3304.
Notifies the main device 1 via the connection device 2.

The main unit 1, which has received the off-hook 3011 from the wireless telephone B in step S3107, in step S3108
Extension answer 3013 is sent to wireless telephone A by LCCH-T of PCF frame.
To notify that the wireless dedicated phone B has responded, and to allow the extension communication permission 301 to the wireless dedicated phone B.
Send 5. This extension response 3013 indicates that CPU2 in main unit 1
01 includes communication resource information such as empty time slots stored and managed in the RAM 203, hopping patterns, and voice channels (T1 to T4, R1 to R4) in the PCF frame to be used. The extension communication permission 3015 also includes communication resource information such as hopping patterns and voice channels used for direct communication between terminals.

The wireless telephone A, which has confirmed the other party's response by the extension response signal 3014 in step S3205, operates in step S3206.
At the same time as transmitting the voice channel connection completion signal 3006 to the main device 1 via the connection device 2 using the LCCH-R, stop the ringback tone, and switch to the logical channel assigned to communicate with the communication partner, The microphone 410 and the speaker 411 are controlled, and the call state with the call partner is set (step S3208).

On the other hand, in step S3305, the extension communication permission signal 3
Upon receiving 016, the wireless telephone B stops the ringing tone, synchronizes with the voice channel obtained from the communication resource information in the extension communication permission signal 3016, and transmits the voice channel connection completion signal 3018 via the connection device 2 in step S3306. To the main unit 1 and switch to the assigned logical channel, and the microphone 410,
The speaker 411 is controlled, and the call state with the other party of the call is set (step S3307).

That is, thereafter, in direct communication between wireless terminals, control data and voice data are exchanged using this voice channel. Specifically, in Tn and Rn of the PPF frame shown in FIG. 14B, as shown in FIG. 14E, control data is communicated in the D time slot and voice data is communicated in the B time slot. Even during direct communication between wireless terminals, at the timing of the beginning of the frame, the frequency is switched to that of the PCF, and LCCH-T is received,
The ability to send LCCH-R is a major feature of this system. By doing so, it is possible to receive data from the main device 1 even during extension communication,
It is possible to support services such as incoming calls.

When the main unit 1 receives the voice signal connection completion 3017 from the wireless-only telephone B in step S3109, it determines that the wireless-only telephones A and B have started a call, and the extension communication ends in step S3110. Wait to do. On the other hand, the wireless telephones A and B respectively monitor the state of the wireless line and the input to the key matrix 413.

When the call is completed and the wireless telephone A detects an on-hook in step S3209, the wireless telephone A transmits an on-hook signal 3020 to the wireless telephone B in step S3210. Upon receiving the on-hook signal 3020 in step S3308, the wireless telephone B transmits the on-hook confirmation signal 3021 as control information within the communication channel. Upon receiving the on-hook confirmation signal 3021 in step S3211, the wireless telephone A switches the communication channel to the logical control channel in step S3212 and transmits the extension communication end signal 3023 to the connection adapter 2.

Upon receiving the extension communication end 3002 in step S3110, the main unit 1 transmits the voice channel disconnection 3024 to the wireless dedicated telephone A and the voice channel disconnection 3026 to the wireless dedicated telephone B in step S3111. After that, in step S3112, communication resources such as voice channels allocated to the wireless telephones A and B are released.

In step S3213, the voice channel disconnection signal 302
The wireless telephone A that has received 5 disconnects the voice channel in step S3214. Similarly, the wireless telephone B, which has received the voice channel disconnection signal 3027 in step S3310, disconnects the voice channel in step S3311.

A call between extension lines can be realized by the above procedure. The basic part of this procedure is also used for data transmission from the computer to the printer described in the next section.

Processing at the time of data transmission from the computer to the printer One of the characteristics of the wireless switching system of this embodiment is that the data transmission between the extensions is high speed. Therefore, an example in which data is transmitted in bursts from a computer to a printer will be described below. However, the control procedure between the main device 1 and the terminal is the same as the processing of the extension-to-extension call described above, and therefore different points will be mainly described.

First, when the printing application program is started in the computer which is the data terminal 5, the wireless adapter driver installed in the computer operates, and the data transmission request and the destination number (the printer which is the data terminal 5 Extension number) to the wireless adapter 4.

Next, the wireless adapter 4 enters into a procedure for making a call between extension lines. That is, the extension call request is sent to the main device 1 by the logical control channel (LCCH-R). However, unlike the above-mentioned extension call, since it is necessary to use the burst data frame (BDF), the extension call request event information includes information for requesting BDF allocation. By using BDF, it is possible to transmit at about 450kbps.

Upon receiving the extension call request event information, the main unit 1 sends an incoming call notification to the wireless adapter 4 connected to the destination printer by using the logical control channel (LCCH-T). When the main device 1 receives the incoming call permission from the printer side, it assigns the BDF hopping pattern to be used to the sending computer and the receiving printer. After the hopping pattern is assigned in this way, the computer and the printer start data communication without going through the main unit 1.

Since the BDF is for performing burst transmission, it normally performs unidirectional data transmission, but at the start of communication, it is assumed that the computer and the printer sequentially perform transmission for each frame. During this period, the number of frames continuously transmitted from the computer and the number of frames continuously transmitted from the printer thereafter are determined. By taking such a procedure, it is possible to realize optimized channel use according to the application of the terminal.

After these steps are completed, the wireless adapter 4 connected to the printer performs error correction processing on the print data received from the computer, assembles the frame, and then
It will be sent to the printer.

Although the data transmission from the computer to the printer has been described above, the same procedure can be used for the data transmission between the computers.

Processing at the time of access from the computer to the personal computer communication via the public network In the previous section, high-speed data transmission in the system was explained, but this system is not limited to the system, and data transmission to the public network is also possible. Yes, it can also support applications such as personal computer communication. Since the basic operation procedure is the same as the case of making an outside line from the wireless terminal, the description will focus on the different parts.

When an application program for, for example, personal computer communication of the computer which is the data terminal 5 is started, the wireless adapter driver installed in the computer operates to send an external line transmission request to the wireless adapter 4
Send to

Next, the wireless adapter 4 enters the outside line calling procedure. In other words, the logical control channel (LCCH-R)
Send an outside line request to 1 and receive an empty PDF slot. After receiving the slot allocation, data will be transmitted using the 32 kbps slot of PCF.

In order to transmit data to PSTN6, it is necessary to modulate the data by MODEM511. Therefore, when transmitting the data to the outside line, the wireless adapter 4 modulates the data into a signal in the voice band (300 Hz to 3.4 KHz) by the MODEM 511, so that the signal can be transmitted.
Since the modulated data can be treated as voice information, this information is ADPCM encoded and frame assembled.

By following such a procedure, it becomes possible to support an application such as personal computer communication by using the same procedure as a normal voice call.

As described above, the present system is capable of high-speed data transmission in addition to the telephone call function of the telephone exchange device. In particular, the data terminal 5 performs high-speed data transmission within the system and the public network. You can also access the site.

As described above, according to this embodiment,
Since the interval for transmitting control information can be changed according to the type of terminal accommodated in the extension, real-time transmission / reception of semi-fixed telephones and wireless adapters and intermittent transmission of mobile terminals can be performed with one connection device. It becomes possible to receive. For this reason, in semi-fixed telephones and wireless adapters, operability is improved without worrying about the slow response that is likely to occur in wireless, and in mobile terminals, battery consumption is suppressed by performing intermittent reception. , It is possible to enable continuous operation for a long time.

[0198]

[Second Embodiment] Hereinafter, an exchange system according to a second embodiment of the present invention will be described. Note that, in the second example, the configurations substantially the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the above-described embodiment, an example in which the connecting device I / F 210 of the main device 1 and the connecting device 2 are connected by a cable has been described, but in the second embodiment, the connecting device I / F 210 and the connecting device 2 are connected. An example will be described in which the and are integrally formed on one card, for example.

[Details of Main Device-Connecting Device Interface] FIG. 34 is a block diagram showing a detailed configuration example of the main device-connecting device interface of the second embodiment.

Reference numeral 3401 denotes a CPU, which controls the exchange section and the wireless connection section. 3402 is a gate array (GA)
Then, the sync signal and clock are supplied to the ADPCM CODEC3404. Reference numeral 3403 is a speech path unit, which controls exchange of time slots of PCM signals by a synchronization signal and a clock supplied from the GA 3402. 3404 is an ADPCM CODEC, which is a multiplexed ADPCM signal input from a channel CODEC 3405 described later.
Converted to PCM signal, based on the sync signal supplied from GA3402, put the PCM signal in a predetermined time slot and output it to the call path unit 3403. A signal is input, predetermined compression is performed, and audio data multiplexed in the channel CODEC3405 is output.

Further, 3405 is a channel CODEC, which is a radio unit 340.
The data received from 6 is separated into voice data and control data based on the synchronization signal included in the received data,
The separated audio data is output to the ADPCM CODEC 3404, and the separated control data is output to the CPU 3408. Further, the channel CODEC 3405 assembles the control data input from the CPU 3408 and the audio data input from the ADPCM CODEC 3404 into a predetermined frame and outputs the frame to the wireless unit 3406.
A control data bus 3407 is a bus for the CPU 3401 to transmit various control data to each unit.

[Operation of Interface] Next, the operation of the connection device 2 and the main device 1 when the main device-connection device interface shown in FIG. 34 is used will be described.

When the main unit 1 side detects an incoming call from the line, the CPU 3401 outputs control data indicating that there is an incoming call to the channel CODEC 3405. Channel CODEC3405
The LCCH in the LCCH-T whose control data is shown in Figure 14F.
And outputs it to the wireless unit 3406 at a predetermined timing.

In the channel CODEC 3405, the wireless unit 3406 is used as shown in FIG. 14G.
When it is detected that the LCCH-R shown in is received, the detected LCCH is detected by the CPU3 based on the UW address data in the LCCH-R.
Notify 401. When the CPU 3401 detects that the response signal from the wireless terminal is included in the LCCH, the channel CO
The DEC3405 is instructed to output the connection permission signal and the information of the used time slot to the wireless terminal using the LCCH of LCCH-T.

When there is a response from the wireless terminal using the LCCH of LCCH-R, channel CODEC 3405 separates the LCCH signal from the LCCH-R and outputs it to CPU 3401. When the CPU 3401 confirms the response, it sends the call path from the line to the call path part 3403.
Command to connect to ADPCM CODEC3404.

In the ADPCM CODEC 3405, the voice signal from the line which is input in synchronization with the SYNCP of the GA3402 is converted from PCM into ADPCM and is input into the channel CODEC 3405 in synchronization with SYNCA. The audio data input to channel CODEC3405 is 8
4 bits × 40 samples are performed at a frequency of kHz, and a 160-bit block is placed in one of the time slots T1 to T4 of the frame shown in FIG. 14E and sent to the wireless terminal.

[0208] Also, the voice data sent from the wireless terminal is placed in one of the time slots R1 to R4 of the frame shown in Fig. 14E, decomposed as B by the channel CODEC 3405, and taken out. The channel CODEC3405 outputs the taken-out audio data to the ADPCM CODEC3404 as 4-bit data at a cycle of 8 KHz in synchronization with SYNCA. ADPCMCO
The DEC3404 outputs the input ADPCM data to the speech path unit 3403 as 8-bit PCM data in synchronization with SYNCP.

[Transmission / reception of control data] Next, the CPU 3401 when the interface between the main device and the connection device shown in FIG. 34 is used.
The transmission / reception of control data between the channel CODEC 3405 and the channel CODEC 3405 will be described in detail.

(1) At start-up When the system is started up, the CPU 3401 will detect the control data bus 3
Control data for instructing frequency scanning to determine the hopping pattern is transmitted to the channel CODEC 3405 via 407. Channel that received the instruction CODEC3405
Causes wireless unit 3406 to scan an empty channel at a predetermined frequency. And the channel CODEC3405
When an analog level RSSI signal is received, the scan result is compared with a predetermined threshold value, and when the level is equal to or lower than the threshold value, the result is stored in an internal register. Next, the same process is performed for all frequencies while changing the frequency. When this process ends, the CPU 3408 is notified that the scan of empty channels has ended.

The CPU 3401, which has received the notification of the end of scan,
The free channel can be known by reading the register of the channel CODEC3405 that stores the free channel information. The CPU 3401, which has obtained the empty channel information, determines the hopping frequency based on the obtained empty channel data, and writes the frequency information, control data, and system ID information in the register of the channel CODEC 3405. Based on the information written in the register, the channel CODEC 3405 controls the radio unit 3406 to perform hopping and starts transmitting control data, system ID, etc. to the radio terminal accommodated in the extension.

Then, after transmitting the control data via the radio section 3406, the response signal from the extension radio terminal is sent to the channel CODE.
When the C3405 receives the channel CODEC3405, the wireless unit 3406
From the wireless terminal ID (sub I
D) and wireless terminal type information are extracted and notified to the CPU 3401. The CPU 3401 stores the notified wireless terminal ID and terminal type information in an internal register or the like.

When the CPU 3401 recognizes (stores) the wireless terminal IDs and the wireless terminal types of all the extension terminals by repeating the above processing, it transmits control data based on the stored wireless terminal types. Note that the wireless terminal type is transmitted on the LCCH-R, but it may be always placed on the FSYN on the frame.

(2) Standby CPU 3401 sends control information to be added to the transmission data frame to C
Send to PU I / F807. When the received data is control data to be sent to a wireless terminal or the like, the CPU I / F 807 transmits the control data to the transmission signal frame processing unit 808 and incorporates it in a frame such as LCCH-T. If the received data is control data for controlling the wireless unit 802, the CPU I / F 807
The received data is transmitted to the wireless control unit 805 shown in FIG. Upon receiving this data, the wireless control unit 805 sets the wireless unit 802 in a transmission state at a predetermined timing, and performs intermittent transmission and normal transmission. When this transmission ends, the transmission frame processing unit 808 shown in FIG. 15 sends an end signal to the wireless control unit 805.
Output to Upon receiving the end signal, the wireless control unit 805 switches the wireless unit 802 to the reception mode and performs reception from the wireless terminal.

Receiving frame processing section 809 receiving the signal received by radio section 802 descrambles the received signal and synchronizes the descrambled received signal with synchronization processing section 810.
Output to The synchronization processing unit 810 checks the synchronization signal and the ID, determines whether to receive the frame,
When it is determined that the received frame cannot be received, the received frame processing unit 80
It outputs a signal to 9 to discard the received frame.

If the synchronization processing unit 810 determines that reception is possible, the synchronization processing unit 810 outputs a signal instructing the received frame processing unit 809 to disassemble the received frame. The reception frame processing unit 809 that receives this instruction signal extracts the LCCH-R and outputs it to the CPU I / F 807. The CPU I / F 807 outputs the received control signal to the CPU 3401. After that, after receiving a signal from the wireless terminal for a predetermined time and processing the received signal by the received frame processing unit 809, when the received signal ends, the CPU 80
4 notifies the wireless controller 805 of the end of the received frame. Upon receiving this notification, the wireless control unit 805 controls the wireless unit 802 to be in a standby state and further to be in a sleep state.

(3) During a call When a call process is performed between the wireless terminal and the connection device 2, the CPU
The 3401 uses the CPU I /
Send to F807. When the received data is the control data to be sent to the wireless terminal, the CPU I / F 807 transmits the control data to the transmission signal frame processing unit 808 and incorporates it in a frame such as LCCH-T. If the received data is the data for controlling the wireless unit 802, the CPU I / F 807 transmits the received data to the wireless control unit 805. Upon receiving this data, the wireless control unit 805 puts the wireless unit 802 into a transmission state at a predetermined timing.

At the same time, when the audio data is transmitted from the ADPCM CODEC 3404 to the ADPCM codec I / F 806 in synchronization with the synchronization signal, the CPU 3401 fetches the audio data at a predetermined timing and sends it to the transmission frame processing unit 808. The transmission frame processing unit 808 that has received the voice data places the voice data on the time slot indicating the transmission destination based on the control data of the CPU 3401.

As described above, the transmission frame processing unit 80
The transmission frame including the control data and the voice data assembled in 8 is scrambled and is output to the wireless unit 802 at a predetermined timing based on the control signal of the CPU 3401. When the transmission is completed, the transmission frame processing unit 808
Outputs an end signal to the wireless controller 805. Upon receiving the end signal, the wireless control unit 805 switches the wireless unit 802 to the reception mode.

Upon receiving the received signal from radio section 802, received frame processing section 809 descrambles the received signal and synchronizes the unscrambled received signal with synchronization processing section 810.
Output to The synchronization processing unit 810 checks the synchronization signal and the ID, determines whether to receive the frame,
When it is determined that the received frame cannot be received, an instruction signal for discarding the received frame is output to the reception frame processing unit 809.

If the synchronization processing unit 810 determines that the received frame can be received, it outputs to the received frame unit 809 an instruction signal for disassembling the received frame. Upon receiving this signal, the reception frame processing unit 809 extracts the LCCH-R and outputs the CPU I / F.
Output to 807. The CPU I / F807 sends the received control signal to the CPU.
Output to 3401. Also, the audio data decomposed and taken out by the reception frame processing unit 809 is ADPCM codec I / F.
The data is transmitted to the 806 and is output to the ADPCM CODEC 3404 at a predetermined timing based on the control data from the CPU 1408.

When the above reception processing is completed, the CPU 3408
Sends a reception frame end notification to the wireless controller 805. Upon receiving this notification, the wireless control unit 805 outputs instruction data for switching the reception frequency to the wireless unit 802 based on the control data from the CPU 3408.

[0223]

[Third Embodiment] The exchange system according to the third embodiment of the present invention will be described below. Note that, in the third example, the substantially same configurations as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the above-mentioned embodiment, an example in which an analog public network is accommodated as an external line has been described, but a digital public network (for example ISDN) ISDN can also be accommodated.

FIG. 35 is a block diagram showing a configuration example of an ISDN wireless adapter. 1001 is an ISDN terminal, 1002 is an ISDN terminal wireless adapter, and 1003 is a wireless unit.

In the wireless adapter 1002, 1004 is a main control unit, which is composed of a CPU, peripheral devices for controlling interrupts, an oscillator for system clock, etc.
Control each block in. A memory 1005 is composed of a ROM for storing a control program executed by the CPU, a RAM used as a buffer area when the CPU performs various processes, and the like.

An ISDN frame assembling / disassembling unit 1006 performs layer 1 processing of the ISDN frame. That is, AMI
A function to convert a code to a binary code, B channel data and D
It has a function to multiplex channel data and a function to detect activation of layer 1. A channel codec 1007 performs frame processing and wireless control, and has a function of assembling data received from the ISDN terminal 1001 into a wireless frame.

FIG. 36 is a diagram showing a frame for data communication between the ISDN terminal 1001 and the main unit 1, where FSYN is a synchronization signal and LCCH.
-T is a logical control channel sent from the main device 1 to the ISDN terminal 1001, and LCCH-R is a logical control channel sent from the ISDN terminal 1001 to the main device 1. For example, it is conceivable to put the terminal type information indicating the ISDN terminal on the LCCH-R and notify the connection device 2. It is also conceivable to include the terminal type information in FSYN and notify the connection adapter 2.

[0229] ISDN-T is the main device 1 to the wireless adapter 1
In the data slot to be transmitted to 002, two 64 kbps voice channels and one 16 kbps control channel are multiplexed. The ISDN-R is a data slot transmitted from the wireless adapter 1002 to the main device 1, in which two 64 kbps voice channels and one 16 kbps control channel are multiplexed.

Next, the operation of the wireless adapter 1002 will be described.

The 192 kbps data received from the ISDN terminal 1001 is the ISDN frame assembling / disassembling unit 1 in the wireless adapter 1002.
It is decomposed in 006 and only B channel data and D channel data are extracted. The extracted data of 144 kbps in total is put in the ISDN-T shown in FIG. 36 and transmitted to the main device 1 side. Conversely, the data from the main device 1 is received by ISDN-R. The received 144kbps data is added with predetermined layer 1 information and converted to AMI code, and then ISDN terminal
Sent to 1001.

Next, the processing on the main device 1 side when the interface shown in FIG. 34 is used will be described.

The transmission signal from the ISDN terminal 1001 is sent to the wireless unit 34.
If it is received by channel CODEC3405 via 06 and it is known in advance by LCCH-R that the transmission is from an ISDN terminal, take out ISDN-R from the received signal and set the ISDN I / F at a predetermined timing. Output to. In addition, the channel CODEC3405 that received the data from the ISDN I / F sends the data to the ISDN
It is put in the ISDN-T of the frame and transmitted to the wireless adapter 1002 for the ISDN terminal together with the synchronization signal.

Next, the processing on the main device 1 side when the interface shown in FIG. 17 is used will be described.

[0235] The transmission signal from the ISDN terminal 1001 is transmitted to the wireless unit 14
If it is received by the channel CODEC 1410 via 11, and it is known in advance that the transmission is from the ISDN terminal by LCCH-R, take out the ISDN-R from the received signal and send it to the transmission unit 1409 at a predetermined timing. Output. The transmission unit 1409 uses the input ISDN-R as one block and the transmission unit 1 on the main device 1 side.
Send to 405 with sync signal. The transmission unit 1405 receives the received I
Take out SDN-R and output it to ISDN I / F at a predetermined timing.

[0236] Further, the transmission section 1405 which has received the data from the ISDN I / F at a predetermined timing sends the data to the transmission section 1409 together with the control data. The transmission unit 1409 decomposes the control data and the ISDN data from the received data, outputs the control data to the CPU 1408, and converts the ISDN data into the channel CODEC1410.
Output to Channel CODEC 1410 that received ISDN data
Puts the data in the ISDN-T of the ISDN frame and transmits it to the wireless adapter 1002 for the ISDN terminal together with the synchronization signal.

Next, a procedure for a case where a video conference terminal having an ISDN I / F accesses the ISDN via the main unit 1 will be described.

When the video conference terminal makes a call origination request, ISDN layers 1 to 3 are activated and data transmission is started.
The wireless adapter 1002 extracts the D channel information by the ISDN frame assembling / disassembling unit 1006 and analyzes the content. As a result, if the request is a call origination request (SetUp command), the wireless link acquisition procedure is started. That is, in the same procedure as when making a call from the wireless terminal described in the first embodiment, the calling request is sent to the main device 1, and the main device 1 that receives the calling request from the wireless adapter 1002 sends the calling request to the ISDN line. Send out.

When the calling procedure ends and the communication partner responds, the main unit 1 performs exchange control for connecting the B channel of the ISDN line to the connection unit 2. The B channel data received from the other terminal is put in the ISDN-T of the wireless frame, and the ISDN terminal
The B channel data transmitted from the ISDN terminal 1001 is sent to the partner terminal in the ISDN-R of the radio frame.

In this way, it becomes possible to accommodate the ISDN terminal in this system. Note that a terminal with an ISDN I / F is not necessarily required to carry out an application such as a video conference via ISDN, and it has a function of transmitting and receiving data at a transmission rate of 64 kbps or 128 kbps. If the terminal has a function to wirelessly communicate with the device 1, use the ISDN line interface in the main device 1 to
Access to N is possible. Especially, if the terminal itself has a built-in wireless adapter function, ISDN frame assembly /
The disassembling unit 1006 and the like are unnecessary, and applications such as video conferences can be realized with a simpler configuration.

FIG. 37A is a diagram showing a direct sequence communication procedure used in the system of the third embodiment, and FIG. 37B shows a communication frame format between the main device and the wireless terminal used in the system of the second embodiment. FIG. 37C is a diagram showing a communication frame format between wireless terminals used in the system of the second embodiment.

Even if the present invention is applied to a system composed of a plurality of devices (for example, host computer, interface, printer, reader, etc.), one device (for example, copying machine, facsimile machine, etc.) It may be applied to a device consisting of.

Further, the present invention is achieved by supplying a storage medium recording a software program for achieving the present invention to a system or apparatus, and reading out and executing the program stored in the storage medium by the system or apparatus. It goes without saying that it can be applied to cases where As a storage medium for supplying the program, for example, a floppy disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a non-volatile memory card, a ROM or the like can be used.

[0244]

As described above, according to the present invention,
It is an object of the present invention to provide a switching system and a switching method thereof that allow a mobile terminal to perform discontinuous reception without delaying response processing of other than the mobile terminal.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a wireless communication system and its main device.

FIG. 2 is a block diagram showing the configuration of the connection device shown in FIG.

FIG. 3 is a block diagram showing the configuration of the wireless telephone shown in FIG.

FIG. 4 is an operation sequence diagram of a wireless communication system,

FIG. 5 is a sequence diagram of intermittent reception,

FIG. 6 is a diagram showing a frame structure in discontinuous reception;

FIG. 7 is a diagram showing an example of the overall configuration of a wireless communication system according to an embodiment of the present invention;

8 is a block diagram showing a configuration example of a main device of the exchange shown in FIG.

9 is a block diagram showing a configuration example of the connection device shown in FIG.

FIG. 10 is a block diagram showing a configuration example of the wireless telephone shown in FIG.

FIG. 11 is a block diagram showing a configuration example of a wireless adapter connected to a data terminal device that can be accommodated in the present system;

[Fig. 12] MO required for data transmission to PSTN
Block diagram showing a configuration example of a wireless adapter with a built-in DEM (modem),

FIG. 13 is a block diagram showing a configuration example of a wireless unit (or a wireless unit unit);

FIG. 14A is a diagram showing a configuration example of a wireless frame used by the present system;

FIG. 14B is a diagram showing a configuration example of a wireless frame used by the present system;

FIG. 14C is a diagram showing a configuration example of a radio frame used by the present system;

FIG. 14D is a diagram showing a configuration example of a radio frame used by the present system;

FIG. 14E is a diagram showing a configuration example of a radio frame used by the present system;

FIG. 14F is a diagram showing a configuration example of a radio frame used by the present system;

FIG. 14G is a diagram showing a configuration example of a radio frame used by the present system;

FIG. 15 is a block diagram showing a configuration example of a channel codec,

FIG. 16 is a conceptual diagram of frequency hopping used by this system,

FIG. 17 is a block diagram showing a detailed configuration example of an interface between a main device and a connection device;

FIG. 18 is a diagram showing an example of a timing of transmitting control information from the connection device to the wireless terminal during standby,

FIG. 19 is a diagram showing a timing example in the case where the wireless terminal performing intermittent reception makes a call to shift from the intermittent reception mode to the calling mode;

FIG. 20 is a sequence diagram showing an example of power-on operation during special operation,

FIG. 21 is a sequence diagram showing an example of power-on operation during normal operation.

FIG. 22 is a flowchart showing an operation example when the main device (connection device) is powered on;

FIG. 23 is a flowchart showing an operation example when the wireless terminal is powered on;

FIG. 24 is a sequence diagram of outside line transmission,

FIG. 25 is a flowchart showing an operation example of the main device when an outside line is transmitted;

FIG. 26 is a flowchart showing an operation example of a wireless terminal when making an outside line call;

FIG. 27 is a sequence diagram of an outside line incoming call,

FIG. 28 is a flowchart showing an operation example of the main device when an external line is received;

FIG. 29 is a flowchart showing an operation example of a wireless terminal when receiving an outside line.

FIG. 30 is a sequence diagram of each device during extension communication,

FIG. 31 is a flowchart showing an operation example of the main device during extension communication;

FIG. 32 is a flowchart showing an operation example of a calling-side wireless terminal during extension communication;

FIG. 33 is a flowchart showing an operation example of a called-side wireless terminal during extension communication;

FIG. 34 is a block diagram showing a detailed configuration example of a main device-connecting device interface according to a second embodiment of the present invention;

FIG. 35 is a block diagram showing a configuration example of a wireless adapter for ISDN,

36 is a diagram showing a frame for data communication between the ISDN terminal shown in FIG. 35 and the main device;

FIG. 37A is a diagram showing a direct sequence communication procedure used in the system of the third embodiment;

FIG. 37B is a diagram showing a communication frame format between a main device and a wireless terminal used in the system of the second embodiment;

FIG. 37C is a diagram showing a communication frame format between wireless terminals used in the system of the second embodiment.

[Explanation of symbols]

 101 Switch 1 Main unit 2 Connection unit 3 Wireless telephone 4 Wireless adapter 5 Data terminal

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Claims (7)

[Claims] 1. A switching system, comprising: a main device accommodating an external line; and a plurality of terminals that perform wireless communication with the main device, wherein the main device uses the terminal information sent from the terminal to determine the An exchange system comprising: a recognition unit for recognizing a type of a terminal, and a control unit for controlling a transmission interval of control data to be transmitted to the terminal, based on the recognized type of the terminal. 2. The control means sends control information including terminal information, control data, transmission interval information, and the number of transmissions to a connection device connected to the main device. The exchange system described. 3. The connection device according to claim 2, wherein the connection device controls a transmission interval and a transmission frequency of control data to be transmitted to the terminal, based on control information transmitted from the main device. Exchange system. 4. The main device accommodates a connection device, and performs a switching control and a transmission interval control of control data to be sent to the terminal by one control means.
The exchange system described in. 5. The exchange system according to claim 1, wherein the terminal notifies the main unit of the terminal type of the terminal by using a logical control signal. 6. The terminal notifies the main unit of the terminal type of the terminal itself by using a synchronization signal.
Exchange system described in 1. 7. A method of exchanging a switching system, comprising: a main device accommodating an external line; and a plurality of terminals for wireless communication with the main device, the receiving step comprising receiving terminal information from the terminal Of the exchange system, which comprises: a recognition step of recognizing the type of the terminal from the terminal information obtained; method of exchange.