JPH0918916A - Radio exchange system - Google Patents

Abstract

PURPOSE: To prevent deterioration in communication efficiency and to improve the system convenience by allocating a different hopping pattern to a frequency switched for each prescribed time so as to conduct radio communication with the allocated hopping pattern. CONSTITUTION: Data received from an external circuit are subject to band limit by a base band filter 626 in a radio section and given to a modulation terminal of a VCO 622 of a transmission system. A modulation wave of an intermediate frequency generated by a frequency synthesizer consisting of a VCO 622, an LPF 623 and a PLL 624 is given to an up-converter 608 and added to a carrier signal generated by a frequency synthesizer consisting of a VCO 619, an LPF 620 and a PLL 621 for hopping and the sum is given to a transmission system amplifier 606. The signal amplified by the transmission system amplifier 606 in the case of transmission is subject to elimination of an undesired band signal by a BPF 603 and the resulting signal is emitted to space as a radio wave from antennas 601a, b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication network, and more particularly to a wireless switching system having a function of connecting to a public line and a switching function.

[0002]

2. Description of the Related Art In recent years, wireless communication has rapidly progressed and is used in various fields. Telephone exchange devices (including key telephone devices) are no exception, and systems have been proposed in which communication is performed wirelessly between a main device having an exchange function and a wireless telephone.

Therefore, a conventional radio telephone exchange apparatus will be described. <System Configuration> In a conventional wireless switching system, a wireless transmission system for a low power analog cordless telephone is used for wireless communication between an extension terminal and a main device. That is,
The modulation method is FM modulation, and two control channels and 87
The voice call channel can be used, and the communication is possible only at 1: 1 (point to point). 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, the voice call channel to be used in the control channel is determined, and after the call channel is determined, the channel is changed to that channel and thereafter the call is continued using that channel. .

The configuration and basic operation of each part of the conventional wireless switching system will be described below. <Structure of Main Device> FIG. 37 is a block diagram showing the structure of a conventional wireless switching system and the structure of the main device thereof. In the figure, the main device J1 is the main part of the exchange system,
It accommodates a plurality of outside lines and a plurality of terminals and exchanges calls between them. The connection device J2 receives control from the main device J1 in order to enable the system to accommodate a wireless terminal (a wireless dedicated telephone described below) that is wirelessly connected one-to-one,
The wireless terminal is wirelessly controlled to establish a wireless transmission path. In addition, the wireless telephone J3 is the connection device J described above.
2 is a terminal for making a call with an external line accommodated in the main device J1 via 2 and for making an extension call.

The main device J1 is a PSTN (existing public telephone network) J4 or PSTN (J4) which is one of the outside line networks.
A PSTN line J5, which is an external line from S., and an SLT (single telephone) J6, which is one of the terminals connected to the main device J1, are accommodated.

The internal structure of the main device J1 will be described below.

As shown in FIG. 37, the CPU (J101)
Is a central part of the main device J1 and controls the entire main device including exchange control. ROM (J102) has a CPU
The control program of (J101) is stored in the RAM (J
103) stores various data for controlling the CPU (J101) and provides a work area for various calculations.

The communication path section J104 is a CPU (J101)
Call exchange (time division exchange) under the control of
Under the control of the CPU (J101), the line i / f (J105) performs PSTN line control such as incoming call detection for accommodating the PSTN line J5, selection signal transmission, and DC loop closure. Further, SLTi / f (J106) is the CPU (J1
Under the control of (01), power supply for accommodating the SLT (J6), loop detection, selection signal reception, call signal transmission, etc. are performed.

The telephone set J107 functions as an extension multi-function telephone under the control of the CPU (J101) when the main unit is normally energized, and functions as an SLT at the time of power failure. It has a communication circuit and a display. The tone sending circuit J108 sends out various tones such as a PB signal, a dial tone, and a ring tone. Further, the connection device i / f (J109) sends and receives a call signal and a control signal to and from the connection device J1 in order to accommodate the connection device J2 under the control of the CPU (J101). <Configuration of Connection Device> FIG. 38 is a block diagram showing the configuration of the connection device J2 in the conventional wireless switching system.
In the figure, the CPU (J201) is the main connection device J2.
And is responsible for the overall control of the present connection device J2 including the control of the communication channel and the control of the radio unit. Also, ROM
(J202) stores the control program of the CPU (J201), and the EEPROM (J203) stores the calling code (system ID) of this system. Furthermore, RAM
(J204) stores various data for controlling the CPU (J201) and provides a work area for various calculations.

The main unit i / f (J205) is a CPU (J
201) under the control of the connection device i / f (J
109), a call signal, and a control signal. The PCM codec (CODEC) J206 is a CPU (J201)
Under the control of the main device i / f (J205), the PCM-coded call signal is converted into an analog voice signal, which is transmitted to a voice processing LSI (J207) described later, and at the same time, a voice processing LSI ( The analog voice signal from J207) is converted into a PCM code, and the main unit i / f (J20)
Send to 5).

The voice processing LSI (J207) is a CPU
Under the control of (J201), the wireless unit section J2 described later.
When the demodulated signal from 08 is received and the received signal is control data, A / D conversion is performed and the result is sent to the CPU (J201),
If the received signal is an audio signal, it is descrambled, decompressed, etc. and output to PCMCODEC (J206). At the same time, the voice processing LSI is connected to the CPU (J20
The control data transmitted from 1) is D / A converted and transmitted to the wireless unit J208.
The audio signal from the DEC (J206) is subjected to processing such as scrambling and compression, and is transmitted to the wireless unit section J208.

The wireless unit J208 is a CPU (J2
01) under the control of a voice processing LSI (J20
7) The control data and voice signal from 7) are modulated and processed so that they can be transmitted wirelessly, and the signals are transmitted to the wireless dedicated telephone J3, and the signal received from the wireless dedicated telephone J3 is demodulated to obtain control data and The audio signal is taken out and transmitted to the audio processing LSI (J207). <Configuration of Radio Dedicated Telephone> FIG. 39 is a block diagram showing the configuration of the radio dedicated telephone J3 housed in the conventional radio exchange system. In the figure, CPU (J301)
Is the center of the wireless dedicated telephone J3 and controls the entire wireless dedicated telephone J3 including wireless control and call control.
The ROM (J302) stores the control program of the CPU (J301), and the EEPROM (J303) stores the call code (system ID) of this system and the wireless telephone J.
The sub ID of 3 is stored. Also, RAM (J304)
Stores various data for controlling the CPU (J301) and provides a work area for various calculations.

The communication path section J305 is a CPU (J301)
Under the control of a handset J308 and a microphone J30 described later.
9. Input and output a call signal from the speaker J310.
Under the control of the CPU (J301), the voice processing LSI (J306) receives the demodulated signal from the wireless unit J307, and when the signal is control data, performs A / D conversion and outputs it to the CPU (J301). If the received signal is a voice signal, it is descrambled, expanded, etc. and output to the speech path unit J305, and the CPU (J30
The control data transmitted from 1) is D / A converted and transmitted to the wireless unit section J307, the voice signal from the speech path section J305 is scrambled, compressed, etc., and transmitted to the wireless unit section J307.

On the other hand, the wireless unit J307 is a CPU
Under the control of (J301), the above-mentioned voice processing LSI (J
The control data and the voice signal from 306) are modulated and processed into a state in which they can be transmitted wirelessly, and the resultant is processed by the wireless connection device J2.
Send to At the same time, the signal wirelessly received from the wireless connection device J2 is demodulated, the control data and the audio signal are extracted and transmitted to the audio processing LSI (J306).

The handset J308 inputs / outputs a voice signal for a user of the system to speak, and the microphone J309 is
The sound signal is input as the collected sound, and the speaker J310 outputs the sound signal as a loud sound. The dial number input from the key matrix J311 and the usage status of the outside line are displayed on the display unit J312. The key matrix J311
Includes a dial key (not shown) for inputting a dial number and the like, and function keys such as an outside line key, a hold key, and a speaker key. <Description of Operation of Conventional Wireless Switching System> Next, the basic operation of the conventional wireless switching system will be described.

FIG. 40 is an operation sequence diagram of the conventional wireless switching system. As shown in the figure, when a call request is made from the wireless telephone J3, the wireless telephone J3
Transmits a connection notification signal to the connection device J2 on a predetermined wireless control channel (sequence J401). The connection device J2 that has received this connection notification signal
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 dedicated telephone J3 (J402).

Upon receiving the above 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 (J403). After this,
Sends and receives signals on the call channel.

The connection device J which has received the above movement notification signal
2 confirms the shift to the call channel and transmits a channel movement response signal to the wireless telephone J3 (J404).
Subsequently, the connection device J2 transmits a line connection notification to the main device J1 (J405), and thereafter transitions to the talking state.

When the wireless dedicated telephone J3 receives the channel movement response signal in the above sequence J404 and confirms the establishment of the wireless line, it sends the outside line transmission signal to the connection device J.
2 (J406). The connection device J2, which has received this outside line transmission signal, makes an outside line transmission to the main device J1 (J407), and a voice connection request is sent from the main device J1 to the connection device J2 (J408), and also from the connection device J2 for wireless communication. When the call is made to the telephone J3 (J409), a dial tone is sent (J410). Therefore, a dial call is made (J411), and thereafter, the main device J1 makes a call operation to an outside line, and when the other party answers, the call shifts to the call (J41).
2).

With the above-described procedure, the wireless telephone can make a call through the public line, but for an incoming call, the call is started by acquiring the wireless call channel by the same procedure as above. can do.

[0022]

However, the above-mentioned prior art has the following drawbacks. 1. Since the narrow band FM is used as the wireless modulation system, it is weak against noise and has low confidentiality. 2. Since the frequency to be used is assigned for each call, if the radio environment of the assigned frequency is bad, the call quality will deteriorate and the communication efficiency will decrease. 3. Frequency utilization efficiency is poor because independent control channels are used. 4. Since extension calls between slave units are also performed via the main unit, the main unit requires exchange means for the number of extensions. 5. When using continuous frequency bands for communication, unless a sufficient guard band is taken between the continuous bands, speech quality deteriorates due to adjacent channel interference. 6. When performing the retransmission processing (for example, data communication), the communication efficiency decreases due to the increase of the error rate.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a wireless switching system which prevents the deterioration of communication efficiency and improves the convenience of the system.

[0024]

In order to achieve the above object, the wireless switching system of the present invention has the following configuration.
That is, a main device connected to the public network and having a switching function,
In a wireless switching system composed of a plurality of wireless terminals, allocation means for allocating different hopping patterns to frequencies switched at regular intervals, and wireless communication for wireless communication with the wireless terminals by the hopping pattern allocated by the allocation means. And means.

[0025]

In such a structure, different hopping patterns are assigned to frequencies that are switched at regular intervals, and wireless communication is performed with the wireless terminal according to the assigned hopping patterns.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Among the digital wireless communication systems in recent years, the spread spectrum communication has received particular attention. 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 around the world, 2.4
Frequencies in the GHz band are assigned for spread spectrum communication and are being spread all over the world.

The spread spectrum communication systems are roughly classified into frequency hopping (FH system) and direct spread (DS system). The FH method is to perform transmission using a wide band by changing the modulation frequency within a fixed time, and the DS method is to transmit information by pseudo noise code at a speed that is ten to several hundred times faster. A wide band is used by performing spread modulation.

In this embodiment, a case will be described in which the digital radio communication by the above-mentioned frequency hopping method is used for extension transmission of the radio switching system. <System Configuration> FIG. 1 is a diagram showing an overall configuration of a wireless switching system (hereinafter referred to as a system) according to an embodiment of the present invention. The system shown in the same figure is an exchange 10 that accommodates a public line 102 and has a switching function and a wireless connection function.
1. A plurality of wireless dedicated telephones 103-A, 103- for communicating control data and voice data with the exchange 101
B, a data terminal device 104-A for performing control data communication with the exchange 101 and direct data communication with the terminals.
104-E.

The data terminal device according to the present embodiment is "a terminal having a function of transmitting an arbitrary amount of data in a burst (a data terminal) and a radio which controls radio communication between the data terminal and the main device. Defined as a combination of adapters ". The data terminal is not limited to the computer 104-A, but the printer 104-B, the copying machine 104-C, the video conference terminal 104-D, the facsimile 104-E, the LAN.
The bridge 104-F and other various terminals that perform data processing such as an electronic camera, a video camera, and a scanner (not shown) are applicable.

A major feature of this system is that the above-mentioned wireless dedicated telephones and data terminals 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. <Configuration of Main Unit> First, the configuration of the main unit of the system according to the present embodiment, which accommodates the public line, will be described.

FIG. 2 is a block diagram showing the configuration of the system and the configuration of the main device according to this embodiment. In the figure, the main device 1 is a main part of the present system that accommodates a plurality of outside lines and a plurality of terminals and exchanges calls between them. Further, the connection device 2 receives the control of the main device 1 in order to accommodate a wireless terminal (a wireless dedicated telephone, which will be described later, a data terminal to which a wireless adapter is connected) in the system,
The wireless terminal is wirelessly controlled to establish a wireless transmission path.

The radio-only telephone 3 is a telephone for making a call with an external line accommodated in the main device 1 through the connecting device 2 and for making an extension call with each other. The wireless adapter 4 is, for example, a data terminal 5 such as a personal computer or a printer, an SLT (single telephone) 10, a facsimile (FA).
X) 11 and an ISDN terminal 12 are connected to each other, which is an adapter that enables wireless data transmission between similarly configured data terminals.

The main unit 1 has a PST, which is one of the outside line networks.
N (existing public telephone network) 6, PSTN line 7 which is an external line from PSTN 6, and IS which is one of external line networks.
A DN (service integrated digital communication network) 8 and an ISDN line 9 which is a line from the ISDN 8 are accommodated. Reference numeral 10 is an SLT (single telephone) which is one of the terminals accommodated in the main device 1.

Therefore, the internal structure of the main unit 1 will be described.

The CPU 201 is the center of the main unit 1,
Controls the entire main unit including exchange control. ROM20
2 stores a control program for the CPU 201, and a RAM
A 203 stores various data for controlling the CPU 201 and provides a work area for various calculations. Under the control of the CPU 201, the call path unit 204 controls call exchange (time-division exchange) and controls the PSTN line i.
Under control of the CPU 201, / f205 performs PSTN line control such as incoming call detection for accommodating the PSTN line 7, selection signal transmission, and DC loop closure. In addition, ISDN
The line i / f 206 is ISD under the control of the CPU 201.
ISDN layers 1 and 2 for accommodating N lines
And supports ISDN line control. And SL
Ti / f207 is SLT1 under the control of CPU201.
Power supply for accommodating 0, loop detection, selection signal reception,
Sends a calling signal.

The telephone unit 208 has the CPU 2 when energized.
Under the control of 01, it is a wireless-only telephone unit having a handset, a dial key, a communication line, a display, etc. that functions as an extension wireless-only telephone and functions as an SLT in the event of a power failure. Further, from the tone transmission circuit 209, the PB signal,
Various tones such as dial tone and ring tone are transmitted, and the connection device i
Under control of the CPU 201, the / f 210 transmits / receives a call signal and a control signal to / from the connection device 2 in order to accommodate the connection device 2. <Structure of Connection Device> FIG. 3 is a block diagram showing the internal structure of the connection device 2 of this embodiment. In the figure, CP
U301 is the center of the present connection device 2 and controls the whole connection device 2 including the control of the communication channel and the control of the radio section. The ROM 302 stores the control program of the CPU 301, and the EEPROM 303 stores the calling code (system ID) of this system. Also, the RAM 304
Stores various data for controlling the CPU 301 and provides a work area for various calculations.

Under the control of the CPU 301, the main unit i / f 305 transmits / receives a call signal and a control signal to / from the connection unit i / f 210 of the main unit 1. PCM / ADPCM conversion unit 306
Under the control of the CPU 301, converts the PCM-coded speech signal from the main device 1 into an ADPCM code, transmits the ADPCM code to a channel codec 307, which will be described later, and also performs ADPCM coding from the channel codec 307. The call signal is converted into a PCM code and transmitted to the main device 1.

The above-mentioned channel codec 307 is a CP
Under the control of U301, while performing processing such as scrambling on a call signal and a control signal which are ADPCM encoded,
These signals are time division multiplexed into a predetermined frame. Under the control of the CPU 301, the wireless unit 308 also modulates the framed digital signal from the channel codec 307, processes it so that it can be wirelessly transmitted, and then transmits it to an antenna and receives it wirelessly from the antenna. The demodulated signal is demodulated and processed into a framed digital signal. <Structure of Wireless-Dedicated Telephone> FIG. 4 is a block diagram showing the structure of the wireless-dedicated telephone 3 according to this embodiment. In the figure, a CPU 401 is the center of the wireless-only telephone 3, and controls the entire wireless-only telephone 3 including control of the wireless unit and call control. Further, the ROM 402 is the CPU 401.
The EEPROM 403 stores the call code (system ID) of this system and the sub ID of the wireless-only telephone. Further, the RAM 404 is C
It stores various data for controlling the PU 401 and provides a work area for various calculations.

The call path unit 405 is a circuit for inputting / outputting a call signal from the handset 410, the microphone 411, and the speaker 412, which will be described later, under the control of the CPU 401. ADP
The CM codec 406, under the control of the CPU 401, converts the analog audio signal from the communication path unit 405 into an ADPCM code, which is then described in a channel codec 407.
And the ADPCM-coded call signal from the channel codec 407 is converted into an analog voice signal and is sent to the call path unit 405.

The channel codec 407 is a CPU 40.
Under the control of No. 1, the ADPCM-encoded speech signal and control signal are subjected to scrambling and the like, and they are time-division multiplexed into a predetermined frame. Under the control of the CPU 401, the wireless unit section 408 modulates the framed digital signal from the channel codec 407, processes it so that it can be transmitted wirelessly, transmits it to an antenna described later, and transmits it from the antenna. The signal received at is demodulated and processed into a framed digital signal.

The handset 410 inputs and outputs a voice signal for a call, and the voice signal is collected and input from the microphone 411. Further, the speaker 412 outputs the audio signal in a loud voice. The display unit 414 displays a dial number input from a key matrix 413, which will be described later, an external line usage status, and the like. The key matrix 413 includes dial keys for inputting dial numbers and the like as described above, external line keys, hold keys, and speaker keys. <Wireless Adapter Configuration> FIG. 5 is a block diagram showing the internal configuration of a wireless adapter connected to a data terminal that can be accommodated in the present system. In the figure, the data terminal 501
Is connected to the wireless adapter 502 via a communication cable or an internal bus, such as a personal computer, a workstation, a printer, a facsimile,
Refers to other data terminal equipment.

In the data terminal 502, the main controller 50
Reference numeral 4 includes a CPU (not shown), peripheral devices for performing interrupt control, DMA control, etc., an oscillator for system clock, etc., and controls each block in the wireless adapter. The memory 505 is composed of, for example, a ROM for storing programs used by the main control unit 504, a RAM used as a buffer area for various processes, and the like.

The communication i / f unit 506 is a communication i / f that is standardly equipped with various data terminal devices such as the above-described data terminal 501, for example, a communication i / f such as RS-232C, Centronics, LAN, or the like. Internal buses of personal computers and workstations, for example, ISA bus, PCMCIA (personal computer memory cardint)
international association) i / f etc. are applicable. The terminal control unit 507 manages various communication controls necessary for data communication between the data terminal 501 and the wireless adapter 502 via the communication i / f 506. Further, the channel codec 508 performs frame processing and radio control, and its internal configuration will be described later. Then, here, the data assembled into a frame by the channel codec 508 is transmitted to the main device or the opposite terminal via the wireless unit 503.

The error correction processing unit 509 is used to reduce bit errors occurring in data by wireless communication. An error correction code is inserted into communication data at the time of transmission, and an error position and an error pattern are calculated by calculation processing at the time of reception to correct a bit error in the received data. The timer 510 provides a timing signal used in each block inside the wireless adapter 502.

FIG. 6 is a block diagram showing the configuration of a modem built-in type wireless adapter which is required when data is transmitted to a public line. In the figure, the same components as those of the wireless adapter shown in FIG.
Here, their description is omitted.

In FIG. 6, the modem 511 modulates data into a voice band signal, and the ADPCM codec 512
Encodes the signal modulated by the modem 511. Then, the ADPCM-encoded data is assembled into a frame by a channel codec to be described later, and then the radio unit 503.
Will be transmitted to the main device 1 via the. <Structure of Radio Unit> FIG. 7 is a block diagram showing the structure of a radio unit commonly used by the main unit, the wireless telephone, and the data terminal of the present system. As shown in the figure, the radio unit includes transmitting / receiving antennas 601a and 601b and an antenna 601.
a and b changeover switch 602, a band pass filter (hereinafter, referred to as BPF) for removing a signal in an unnecessary band.
603, a transmission / reception changeover switch 604, a reception system amplifier 605, a transmission system amplifier (with power control) 606, 1st. IF down converter 60
7, an up converter 608, a transmission / reception changeover switch 609, and a BPF 61 for removing a signal in an unnecessary band from the signals converted by the down converter 607.
0, 2nd. With a down converter 611 for IF,
These down converters 607 and 611 form a double conversion system reception mode.

2nd. BPF612, 9 for IF
A 0 ° phase shifter 613 and a quadrature detector 614 are provided.
The BPF 612 and the 90 ° phase shifter 613 detect and demodulate the received signal. Further, it is composed of a waveform shaping comparator 615, a voltage control type oscillator (hereinafter referred to as VCO) 616 of a receiving system, a low pass filter (hereinafter referred to as LPF) 617, a programmable counter, a prescaler, a phase comparator, and the like. PL
L618, these VCO616, LPF61
7, the PLL 618 constitutes a frequency synthesizer of the receiving system.

Further, the VCO 61 for carrier signal generation
9, a PLL 621 including a LPF 620, a programmable counter, a prescaler, a phase comparator, and the like, and a frequency synthesizer for frequency hopping is configured by the VCO 619, the LPF 620, and the PLL 621.
Transmitting system VCO 622 and LPF 62 having a modulation function
3, a PLL 623 including a programmable counter, a prescaler, a phase comparator, etc.
2, the LPF 623, and the PLL 624 constitute a frequency synthesizer of a transmission system having a frequency modulation function.

The clock 625 is the above various PLLs.
A reference clock for 618, 621, and 624, and a baseband filter 626 is a band limitation filter for transmission data (baseband signal). <Explanation of operation of wireless unit> In the transmitting radio unit, data (digital data) input from an external circuit such as a processor (not shown) is band-limited by the baseband filter 626 and then input to the modulation terminal of the VCO 622 in the transmission system. Also, the above V
The intermediate frequency (I) generated by the frequency synthesizer composed of the CO 622, the LPF 623, and the PLL 624.
The modulated wave of F) is input to the up-converter 608,
This is added to the carrier signal generated by the frequency synthesizer composed of the VCO 619, the LPF 620, and the hopping PLL 621, and then input to the transmission system amplifier 606.

At the time of transmission, the signal amplified by the transmission system amplifier 606 to a predetermined level has its unnecessary band signal removed by the BPF 603, and then the antenna 601.
Radio waves are emitted from a and b into space. 2. Upon reception The signal received by the antennas 601a and 601b is BPF.
After the unnecessary band signal is removed by 603, it is amplified to a predetermined level by the receiving system amplifier 605. Then, the down converter 607 removes the carrier signal from the received signal amplified to a predetermined level, and the 1st.
Converted to IF frequency. This 1st. The received signal of the IF is further processed in the 2nd. It is input to the down converter 611 for ID.

The down converter 611 is connected to the VCO 61.
6, the LPF 617, the signal generated by the frequency synthesizer composed of the PLL 618 of the receiving system, and 1s
t. By the input signal from IF, 2nd. A signal having an IF frequency is generated. And 2nd. The received signal down-converted to the IF frequency has its unnecessary band signal removed by the BPF 612, and then the 90 ° phase shifter 613.
Is input to the quadrature detector 614.

The quadrature detector 614 performs detection and demodulation using the signal whose phase is shifted by the 90 ° phase shifter 613 and the original signal. This quadrature detector 61
The data (analog data) demodulated by 4 is then waveform-shaped by the comparator 615 as digital data and output to an external circuit. <Radio Frame Configuration> FIGS. 8 to 14 show frame configurations of radio frames used in the present system. In this system, a "main device-wireless dedicated telephone communication frame" (hereinafter abbreviated as PCF), a "wireless dedicated telephone communication frame" (hereinafter abbreviated as PPF), a "burst data frame" (hereinafter BDF) (Abbreviated) three different frames are used.

The internal data of each frame will be described in detail below.

In the PCF shown in FIG. 8, FSYN is a synchronization signal, LCCH-T is a logical control channel sent from the main unit to the wireless dedicated telephone, and LCCH-T is a logical control channel sent from the wireless dedicated telephone to the main unit. , T1,
T2, T3, T4 are voice channels sent to four different wireless dedicated telephones, R1, R2, R3, R4 are voice channels transmitted from four different wireless dedicated telephones, G
T represents a guard time. Further, F1 and F shown in FIG.
Reference numeral 3 denotes a frequency channel used when wirelessly transmitting the above frame, and indicates that the frequency channel is changed for each frame.

In the PPF shown in FIG. 9, FSYN is a synchronization signal, LCCH-T is a logical control channel sent from the main unit to the wireless dedicated telephone, and LCCH-R is a logical control channel sent from the wireless dedicated telephone to the main unit. , T1,
T2 and T3 represent voice channels sent to three different wireless dedicated telephones, R1, R2 and R3 represent voice channels transmitted from three different wireless dedicated telephones, and GT represents a guard time.

Further, F1, F3, F5, F in FIG.
7 is a frequency channel used when wirelessly transmitting the above-mentioned frame. Unlike PCF, the frequency channel F1 receives logical control information LCCH-T from the main unit, and then the frequency channel is exchanged between the radio-dedicated telephones. By switching to F5, which is secured for communication, communication between wireless dedicated telephones is performed. Then, after that, the procedure of switching the frequency channel to F3, receiving the logical control information from the main device, and further switching the frequency channel to F7 secured for communication between wireless dedicated phones is repeated until the communication between wireless dedicated phones is completed. .

In the BDF shown in FIG. 10, FSYN is a synchronizing signal, LCCH-T is a logical control channel sent from the main unit to the wireless dedicated telephone, and LCCH-R is a logical control channel sent from the wireless dedicated telephone to the main unit. , R
Is a carrier sense time for confirming that the previous frame has ended or for confirming whether another wireless device is not emitting a radio wave, PR1 is a preamplifier, DATA is a data slot accommodating burst data, And GT
Indicates guard time.

Further, in the figure, F1, F3, F5,
F7 is a frequency channel used when wirelessly transmitting the above-mentioned frame, and unlike PCF, F5 is a frequency channel reserved for burst data communication after receiving logical control information from the main device in F1. Switch to and perform communication between wireless dedicated telephones. After that, the frequency channel is switched to F3 to receive the logic control information from the main device,
Further, the procedure of switching the frequency channel to F7 secured for burst data communication is repeated until the burst data communication is completed.

FIG. 11 shows the structure of the sync signal FSYN frame. In the figure, PR is SY, a 62-bit preamble for frequency synchronization acquisition specified by the "Radio System Development Center (hereinafter abbreviated as RCR)" foundation.
N is a 31-bit frame synchronization signal specified by RCR, ID is a 63-bit calling signal specified by RCR, and FI is a 2-bit channel type signal.
A signal for distinguishing between PF and BDF, TS indicates time slot information, and NFR indicates frequency information of the next frame. still,
The numbers in the figure indicate the number of bits of each of the above signals.

FIG. 12 shows the frame structure of a voice channel. Here, T1, T2, T3, T4 and R1, R
Since the configurations of 2, R3 and R4 are common, the transmission voice channels are collectively represented as Tn, and the reception voice channels are collectively represented as Rn. The configurations of Tn and Rn are also common.

In FIG. 12, R is the time of carrier sense for confirming that the previous frame has ended, and for confirming whether another wireless device is not emitting a radio wave, PR
1 is a preamble for each slot, UW is a unique word including a sub ID, D is 3.2 kbps D channel information, B is 32 kbps B channel information, and GT is a guard time. Note that the numbers in the figure also indicate the number of bits here.

FIG. 13 shows the logical control channel LCCH-T.
The frame structure of is shown. The LCCH-T is a logical control channel sent from the main unit to the wireless dedicated telephone as described above, and the UW is a unique word including a sub ID, LC
CH represents logical control information and GT represents guard time. L
Since CCH-T is sent continuously after sending FSYN,
No preamble is added.

FIG. 14 shows the logical control channel LCCH-R.
The frame structure of is shown. The LCCH-R is a logical control channel sent from the wireless-only telephone to the main device, and the R is for confirming that the previous frame has ended and for confirming whether another wireless device is not emitting a radio wave. Carrier sense time, PR1 is preamble for each slot, UW
Indicates a unique word including a sub ID, LCCH indicates logical control information, and GT indicates guard time. <Description of Channel Codec> FIG. 15 is a block diagram showing an internal configuration of the channel codec according to the present embodiment. The above frame is processed by this channel codec.

As shown in FIG. 15, the present channel codec 801 is connected to a wireless section 802, an ADPCM codec 803 built in a wireless dedicated telephone, etc., and a CPU 804 of a wireless dedicated telephone or a wireless adapter. Further, inside the channel codec 801, the wireless control unit 80
5 controls transmission / reception switching and frequency hopping with respect to the radio unit 802. This wireless controller 805
Further, it also has a function of performing carrier detection prior to data transmission.

The CPU I / F 807 is an i / f for exchanging control information with the CPU 804.
A register for storing the state and operation mode of each unit in the IC is built in, and each unit of the ASIC is controlled according to the control signal from the CPU 804 and the state of each unit in the ASIC. ADPC
M codec i / f806 is ADPCM codec 8
The serial data and the synchronous clock for exchanging the audio signal with 03 are exchanged. Further, the transmission frame processing unit 808 assembles the signal from the ADPCM codec 803 and the logical control data input from the CPU 804 into the above transmission frame.

The reception frame processing unit 809 is a radio unit 80.
The control information and audio data are extracted from the signal frame from 2 and are stored in the ADPCM codec i / f806 or C.
Pass to PUi / f807. The synchronization processing unit 810 uses the DPL
It is composed of L and recovers a clock from a received signal to capture bit synchronization.

The basic operation of the above ASIC will be described below. 1. At the time of transmission, the control information to be added to the transmission data frame is received from the CPU 80 by the CPU i / f 807.
When the ASIC is used in the wireless dedicated telephone and the connection device in the main device, the transmission frame processing unit 808 assembles the transmission frame together with the data from the ADPCM codec 803. When the ASIC is used in the data terminal, the transmission frame processing unit 808 assembles the transmission frame together with the error-correction-coded burst data.

When assembling this frame, the data is scrambled. This is necessary to maintain DC balance during wireless transmission. Wireless controller 80
At 5 the timing at which the received signal ends, after carrier sensing, the wireless unit is set to transmit and the transmission frame is passed to the wireless unit. 2. Reception The radio control unit 805 switches the radio unit 802 to reception when data to be transmitted ends, and waits for a reception frame. When the received frame is received, the control information and the data are extracted from the received frame after descramble the data. This control information is passed to the CPU 804 via the CPU i / f 807.

The received frame is a PCF or PPF
In the case of, the received data is ADPCM codec i / f
If the ASIC is used for a wireless dedicated telephone, it is output as voice through the ADPCM codec 803, and if it is used by the main device, it is sent to the communication path. When the received frame is BDF, the received data is transferred to the memory in the data terminal. 3. Handling of logical control data (3-1) During non-communication At the time of no call, the main unit waits at the frequency assigned in advance and receives the LCCH-T from the main unit which is periodically sent. At this time, the LCCH sent from the main device 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.
Then, the wireless telephone sends the LCCH extracted by the reception frame processing unit to the CPU. After that, the LCCH sent from the CPU to the main device is sent to L in the same frame.
It is sent to the main device by CCH-R. Thus, the wireless-only telephone repeats the above procedure until a call is made or an incoming call is made. (3-2) At the time of communication A case where the wireless telephone A makes a call will be described as an example.

It is assumed that the wireless telephone A exchanges the LCCH with the main unit on the frequency channel F1 during no communication. The wireless telephone A monitors the LCCH from the main unit on the frequency channel F1 by the procedure described in the non-communication in (3-1) until a call is made. When a call is made from the wireless telephone A,
In the procedure shown in (3-1), a call request is put in the LCCH-R to be sent to the main device, and the request is sent to the main device. The LCCH for notifying whether communication is possible from the main device side is judged by the LCCH sent on the frequency channel F1 after 100 ms.

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

In the case of the communication between wireless dedicated telephones, the control information is exchanged between the wireless dedicated telephones using the D channel information, and after the communication is completed, the LCCH-R of the frequency channel designated by each wireless dedicated telephone. That is, in the case of the above example, when the wireless-only telephone A exchanges control information with the main device on the frequency channel F1 during non-communication, it is determined that the wireless-only telephone communication has ended. To the main device. <Description of Frequency Hopping Pattern> FIG. 16 is a diagram showing the concept of frequency hopping used in this system.

The system according to the present embodiment uses 26 frequency channels of 1 MHz width which utilize the 26 MHz band which is approved for use in Japan.
Then, considering the case where there is a frequency that cannot be used due to interference noise or the like, 20 frequency channels are selected from the 26 channels, and frequency hopping is performed on the selected frequency channels in a predetermined order.

In this system, for example, as shown in FIG. 8, one frame of communication data has a length of 5 ms.
Hopping the frequency channel for each frame. Therefore, the length of one cycle of one hopping pattern is 10
0 ms.

In FIG. 16, different hopping patterns are shown by different patterns, and a pattern is used in each frame such that the same frequency is not used at the same time. This makes it possible to prevent data errors and the like from occurring. Further, when accommodating a plurality of connecting devices, different hopping patterns are used for the respective connecting devices 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. <Explanation of detailed operation> As described above, in the present system, frames are assembled for communication between the main device, the wireless telephone and the data terminal, and between the terminals, and the frequency to be used is set at regular intervals. Control to switch to.

The specific operation of this system will be described in detail below. 1. Basic operation procedure In this system, before using the call channel,
Logical control channels (LCCHT and LCCHR) that are time-division multiplexed in the frame are used to determine the slot to be used and the hopping pattern. Furthermore, in order to enable each terminal to perform intermittent reception and save power (battery saving), each terminal is designed to transmit and receive only on a logical control channel that transmits at a frequency assigned in advance.

Immediately after the power is turned on, the terminal does not recognize the hopping pattern. Therefore, it waits at an arbitrary frequency and receives a frame at that frequency. Then, when the first frame is received, the frequency information of the next frame contained therein is fetched, and thereafter, frequency hopping is started. When a plurality of connecting devices are used, the hopping pattern used by the connecting device that was able to receive the frame for the first time is followed.

Immediately after the power is turned on, which terminal is assigned to which frequency is not determined. Therefore, when the power is turned on, the ID of each terminal is registered and the logical control channel frequency is assigned in the setting mode. Then, 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, only when data to be transmitted to the main device is generated, the data is transmitted to the main device by using the LCCHR of the assigned frequency.

When it is desired to start communication using the call slot, the logical control channel is used to notify the main device of that fact, and the slot and hopping pattern are assigned. Then, after these allocations are made, it becomes possible to carry out a call or data transmission.

Detailed operations will be described below in some cases. 2. Operation at Power-on of Main Device (Connecting Device) and Wireless Terminal (Setting Mode) This mode is a mode for registering an ID and setting a frequency of a logical control channel to be used.

FIG. 17 is an operation sequence diagram when the power of the main device (connecting device) and the wireless terminal according to this embodiment is turned on.

FIG. 18 is an operation flowchart when the power of the main device (connecting device) is turned on according to this embodiment.

FIG. 19 is an operation flowchart when the power of the wireless terminal according to this embodiment is turned on. (1) Description of Operation Flow at Main Unit (Connecting Device) Power-On First, when the power switch of the main unit 1 (connecting unit 2) main body is turned on, the main unit 1 (connecting unit 2) is operated by the steps shown in FIG. After initializing the main body in step S2201, the hopping pattern of frequency hopping used in wireless communication is determined in step S2202, and then step S220.
3, the PCF frame to which the hopping pattern information (frequency hopping in the next unit time) and the ID of this system are added is transmitted to the wireless terminals 103 and 104. At this time, the ID part (FIG. 11) in the PCF frame contains the system ID, the NFR part (FIG. 11) contains information on the frequency hopping in the next unit time in the hopping pattern, and the LCCH part (FIG. 13). Contains information on a free control channel (LCCH-R) that can be used on the wireless terminal side.

Next, when the main device 1 (connecting device 2) receives the information for position registration such as the system ID and the wireless terminal ID from the wireless terminal 103 (S2204), the wireless terminal 103 in step S2205. Wireless terminal ID
Is stored, the control channel (frequency) for transmitting the wireless communication control information addressed to the wireless terminals 103 and 104 is determined, and this is notified to the wireless terminals 103 and 104 in step S2206 (103 and 104 in FIG. 1). . (2) Description of Operation Flow at Power-on of Wireless Terminal First, when the power switch of the main body of the wireless terminal 103 is turned on, a setting mode is set, and the wireless terminal 103 performs initial setting of the main body in step S2301 of FIG. Then, in step S2302, the operator inputs the wireless terminal ID of the wireless terminal 103 from the key matrix, and the wireless terminal 103 stores this wireless terminal ID.

Next, in step S2303, the PCF frame from the main device 1 (connecting device 2) is received, so that a reception standby state is set at an arbitrary frequency. If the PCF frame from the main device (connection device 2) can be received in step S2304, the system ID is recognized and stored from the ID part (FIG. 11) in the PCF frame and the LCCH-T part (FIG. 13) is received in step S2305. ), Free channel information (frequency for transmitting a PCF frame from the wireless terminal to the main device) is acquired. Also, the frequency hopping in the next unit time is acquired from the NFR part in the PCF frame, the wireless terminal 103 moves the received frequency to that frequency, and the next PC
Wait for F frame. The wireless terminal 103 repeats this operation, recognizes the frequency hopping pattern, and stores it (S2306).

When the radio terminal 103 finds the hopping pattern and the system ID, it sends a frame (FIG. 8) to which the system ID and the ID information of the self radio terminal 103 are added in the idle control channel obtained from the LCCH-T section. It is transmitted to the main device (S2307).

After that, when the control channel frequency designation information is received from the main device 1 (connection device 2), intermittent reception is started on the designated control channel (S2308),
Switch from setting mode to normal mode. 3. FIG. 20 is an external line transmission sequence diagram according to the present embodiment, FIG. 21 is an operation flowchart of the wireless dedicated phone 3 during external line transmission according to the present embodiment, and FIG. 7 is an operation flowchart of the main device 1 when an outside line is transmitted according to the present embodiment.

When the outside line key arranged in the key matrix 414 is pressed on the wireless telephone 3 (S2
501), the wireless telephone 3 causes the outside line LED of the display unit 413 corresponding to the pressed outside line button to transmit and blink (S
2502), and an external line transmission signal (2402) is transmitted to the connection device 2. This outside line transmission signal (2402) is transmitted on the wireless link between the wireless telephone 3 and the connection device 2 by LCCH-R of the PCF frame shown in FIG. In response to this, the connection adapter 2 transmits an outside line call (2401) to the main equipment 1 by the main equipment I / F 305 (S2503).

Main device 1 which receives an outside line transmission (2401)
Determines whether an outside line can be transmitted (S2601).
If the external line is free and transmission is possible, it is determined which voice channel (T1 to T4, R1 to R4) of the PCF frame to use. The outside line transmission permission (2403) is transmitted to the connection adapter 2 by using the determined voice channel number as a parameter (S2602). In response to this, the connection adapter 2 transmits an outside line transmission permission signal (2404) to the wireless dedicated telephone 3. The outside line transmission permission signal (2404) is transmitted by LCCH-T of the PCF frame. Then, the main device 1 captures the outside line (S2603). Upon receiving the outside line transmission permission signal (2404) (S2504), the wireless telephone 3 receives the designation of the call slot in the control channel, and when the voice channel transfer by this call slot is completed, a predetermined LCCH-R is used. An audio channel connection completion signal (2406) is transmitted (S2505).

When the connection device 2 receives the outside line transmission permission (2403) from the main device 1, the channel codec 307 receives a predetermined voice channel and the main device 1
A route to be transmitted to the main device 1 is created, and upon receipt of the voice channel connection completion signal (2406) from the wireless telephone 3, the main device 1 is notified of the voice channel connection completion (2405). Main device 1
Receives the voice channel connection completion (2405) (S
2604), it is determined that the wireless dedicated telephone 3 side is ready, and the outside line display green constant light instruction (2407) is transmitted to the connection device 2 in order to turn on the outside line LED in green (S260).
5). Also, the communication path with the captured outside line is connected (S2
606).

The connecting device 2 instructs the outside green display constant green light (24
07), the outside line display green constant light instruction signal (2408) is transmitted to the wireless telephone 3. In the wireless telephone 3,
When the outside line display green constant light instruction signal (2408) is received (S
2506), the outside line LED is turned on in green, the call inside the wireless telephone 3 is connected, and the dial tone (2411) from the outside line is sent from the speaker or the transmitter (S2507). Further, the main device 1 transmits an outside line display red constant light instruction (2409) to the connection device 2 in order to turn on the outside line LED of the wireless dedicated phone 3 other than the wireless dedicated phone 3 that has transmitted the outside line in red. In response to this, the connection device 2 transmits the outside line display red constant light instruction signal (2408) to the wireless dedicated telephones 3 other than the wireless dedicated telephone 3 that has transmitted the outside line.

Next, the wireless telephone 3 which has received the dial information input from the key matrix 414 is connected to the connection device 2 by the connection device 2.
To a dial signal (2413) (S250
8). In response to this, the connection adapter 2 dials (241
2) is sent to the main device 1. In the wireless telephone 3, the completion of the dial information input is monitored by a time-out (S2509), and when the time-out is reached, the call is in progress (S2510). In the main unit 1, dial (2412)
When the first digit of is received (S2607), the transmission of the dial to the outside line is started, and the transmission is also monitored by the timeout (S2608). After that, when the dial transmission is completed, the call is in progress (S2609).

Then, the call ends, and the wireless telephone 3
Is on-hook (S2511), an on-hook signal (2416) is sent to the connection device 2 (S251).
2). In response to this, the connection device 2 receives the on-hook (241
5) is transmitted to the main device 1, and the main device 1 receives this (S2610), the main device 1 disconnects the voice channel (241
7) is transmitted to the connection device 2 (S2611), and the voice channel allocation to the wireless telephone 3 is canceled. Further, the main device 1 sends an outside line display turn-off instruction (2419, 2421) to the connection device 2 in order to turn off the outside line LED of the wireless telephone 3 (S2612). In response to this, the connection device 2 transmits the outside line display turn-off instruction signal (2420, 2422) to the wireless telephone 3. Upon receiving the voice channel disconnection signal (2418), the wireless telephone 3 opens the communication path (S2513), and turns off the outside line LED with the outside line display turn-off instruction signal (2420, 2422) received subsequently (S2514). 4. FIG. 23 is an external line incoming sequence diagram according to the present embodiment. FIG. 24 is an operation flowchart of the main device 1 when an outside line is called in this embodiment.

First, in step S2801, the public line 10
When there is an incoming call from the main unit 1, the main device 1 transmits an external line incoming call (2702) to the connection device 2, and the connection device 2 receives the call and the connection device 2 receives the wireless telephones 103-A, B.
To the external line incoming signal (2703, 2705). After that, when the connection device 2 receives the off-hook signal (2706) from the wireless telephone 3, the connection device 2 transmits the off-hook signal (2707) to the main device 1. Main device 1 is step S280
When the off-hook 2707 is received in step 3, step S28
04, the HP used for an outside line call addressed to the wireless telephone 103-A that has transmitted the off-hook signal 2706.
An outside line response permission (2708) carrying information such as (hopping pattern) and voice channel number is transmitted.
In response to this, the connection adapter 2 causes the wireless-only telephone 103-A.
To the external line response permission signal (2709). After this,
When the connection adapter 2 receives the voice channel connection completion signal (2710) from the wireless dedicated telephone 3, it transmits the voice channel connection completion (2711) to the main device 1. When the main device 1 receives the voice channel connection completion (2711) in step S2805, the main device 1 proceeds to step S2806, transmits the in-call display instruction (2712) addressed to the wireless dedicated telephone 103-A, and proceeds to step S2807. Calls to outside line to local wireless telephone 103-B (2716)
Send In response to this, the connection device 2 transmits the call instructing signal (2713) to the wireless dedicated telephone 103-A and also transmits the outside line incoming call termination signal (2717) to the other wireless dedicated telephone 103-B.

Next, the main unit 1 sends the data (271) from the wireless telephone 103-A in step S2808.
5) is connected to the public line 102 via the connection device 2, and the data from the public line 102 is connected to the wireless dedicated telephone 103-A via the connection device 2, that is, the public line 102 and the wireless dedicated telephone 103. -Connect the call path with A and start a call. After that, when the connection device 2 receives the on-hook signal (2718) from the wireless telephone 103-A, the connection device 2 transmits the on-hook (2719) to the main device 1. When the main device 1 receives the on-hook (2719) in step S2809, the main device 1 proceeds to step S2810, disconnects the communication path between the public line 102 and the wireless telephone 103-A, and sends the voice channel disconnection (2720). In response to this, the connection device 2 causes the wireless dedicated telephone 103
-Send a voice channel disconnect signal (2721) to A.
Further, in step S2811, the main device 1 stops displaying the outside line in use for the other wireless dedicated telephone 103-B (2.
722) is transmitted. In response to this, the connection adapter 2 informs the wireless telephone 103-B that the external line busy display stop signal (27
23) is transmitted.

FIG. 25 is an operation flowchart of the wireless telephone when an outside line is received according to this embodiment.

First, when an outside line incoming signal (2703, 2705) is received from the connection unit 2 in step S2901, the wireless dedicated telephones 103-A and B ring the incoming call tone from the speaker, and whether or not they are off-hook in the next step S2902. To detect. Wireless telephone 103-
When off-hook is detected in A, step S290
3, the off-hook signal (2706) is transmitted to the connection adapter 2. When the outside line response permission signal (2709) is received from the connection adapter 2 in step S2904, step S29
In step 05, the voice channel is connected and the voice channel connection completion signal (2710) is transmitted. Next, step S2
When the in-call display signal (2713) is received from the connection device 2 at 906, the wireless telephone 103-A displays the display unit 41.
A call display is displayed in 3, and the call is started in step S2907. Then, the on-hook detection is repeated in step S2908, and when the on-hook is detected, the process proceeds to step S2909, and the on-hook signal 2718 is transmitted to the connection adapter 2. When the voice channel disconnection signal (2718) is received in step S2910, the voice channel is disconnected, the in-call display on the display unit 413 is turned off, and the call is ended.

On the other hand, if the off-hook is not detected in step S2902 described above, step S291.
Proceed to 1. In step S2911, if the outside line incoming stop signal (2717) from the connection device 2 to the wireless dedicated phone 103-B is received because the other wireless dedicated phone 103-A has started the outside line call, the wireless dedicated phone is used. 103-B, step S
In step 2912, the display unit 413 displays that the outside line is being used. If the outside line incoming call termination signal (2717) is not received, the process returns to step S2901. Further, the wireless telephone 103-B continues to display the outside line busy display on the display unit 413 until the outside line busy display stop signal (2723) is received in step S2913, and when the signal is received, the process proceeds to step S2914. Proceed and turn off the outside line display. 5. Processing of extension-to-extension call Next, it is managed by the same connection device 2 (that is,
Assuming a case where two wireless dedicated telephones 3 perform extension-to-extension communication when the communication with the main device 1 is the same as the connection device 2 through which they are connected, the wireless dedicated telephone 103-A on the calling side is assumed. The operation of each of the called-side wireless telephone 103-B will be described.

FIG. 26 is a diagram showing a sequence of control data of the main unit 1 of the extension communication, the connection unit 2, the calling-side wireless dedicated telephone 103-A, and the called-side wireless dedicated telephone 103-B. FIG. 27 is a flowchart showing an outline process of the main device 1. FIG. 28 shows a calling-side wireless telephone 103-
It is a flow chart which shows the outline processing of A. Then, FIG. 29 is a flowchart showing the outline processing of the called-side wireless telephone 103-B. However, in each flowchart, only relevant processing portions are described.

First, in the wireless dedicated telephone 103-A, when the extension key arranged in the key matrix 414 is pressed (S3201), the wireless dedicated telephone 103-A.
Transmits a wireless communication signal (3002) to the wireless dedicated telephone 103
-PC shown in FIG. 8 on the wireless link between A and the connection device 2
Transmission is performed using LCCH-R of F frame (S320).
2). Then, the extension communication signal (3
002), the extension communication (300
Send 1).

The main unit 1 uses the extension line communication (30
01) is received (S3101), the CP in the main device 1 is received.
The U201 analyzes the received terminal attributes of the wireless telephone 103-A (S3102), and if the extension call is possible, transmits the extension communication permission (3003) to the connection device 2 (S3104). In response to this, the connection device 2 receives the PCF.
Extension communication permission signal using LCCH-T of frame (3
003) to the wireless dedicated telephone 103-A, and the wireless dedicated telephone 103-A receives the extension communication permission signal (3003) (S3203).

Next, the wireless telephone 103-A which has received the dial information input from the key matrix 414,
A dial signal (3008) is transmitted to the connection device 2 (S3
204) and in response thereto, the connection adapter 2 sends a dial (3007) to the main device 1. The final dial is monitored for timeout. The wireless telephone 103-A is
After the final dial is detected, a ringback tone indicating that the other party is calling is transmitted from the speaker or the transmitter.

The main device 1 dials (30
07) is received (S3105), the dial is analyzed and the extension incoming call (3009) is transmitted to the connection adapter 2 (S3105).
3106). In response to this, the connection adapter 2 transmits the extension incoming signal (3010) to the wireless telephone 103-B by using the LCCH-T of the PCF frame.

When the wireless telephone 103-B receives the extension incoming signal (3010) (S3301), the speaker 4
The extension ringing tone is sounded from 12 and the extension LED is blinked (S3302), the user is notified of the incoming call and the user is prompted to respond, and the key matrix 414 waits for the user to respond.

When the response from the user is detected by off-hook (S3303), the wireless telephone 103-B sends the off-hook signal (3012) to the LCC of the PCF frame.
It is transmitted to the connection device 2 using HR (S3304), the ringing tone of the extension from the speaker 412 is stopped, and the extension LED is turned on. The connection device 2 receives the off-hook signal (3012) from the wireless telephone 103-B.
Sends an off-hook (3011) to the main device 1. When the main device 1 receives the off-hook (3011) from the connection device 2 (S3107), the connection device 2 receives the wireless-only telephone 10
An extension response (3013) indicating that the wireless telephone 103-B addressed to 3-A responds and an extension communication permission (3015) addressed to the wireless telephone 103-B are transmitted (S310).
8). In response to this, the connection device 2 causes the wireless dedicated telephone 10
The extension response signal (3014) is transmitted to 3-A. When the main device 1 transmits the extension response (3013), the CPU 201 in the main device 1 stores and manages the empty time slot and hopping pattern stored in the RAM 203, and the PP to be used.
Voice channels in F frame (T1 to T4, R1 to R
4) and other communication resources are allocated to the direct communication between the wireless-only telephone 103-A and the wireless-only telephone 103-B, and this communication resource information is transmitted via the connection device 2 to the extension response signal (LCCH-T of the PCF frame). 3014) to the wireless dedicated telephone 103-A.

The wireless telephone 103-A receives the extension response signal (3014) (S3205), and when confirming the other party's response, sends the voice channel connection completion signal (3006) to the connection device 2 using the LCCH-R. (S320
6), Stop sending ringback tone from the speaker or transmitter, switch to the assigned call channel to communicate with the communication partner, control the microphone, speaker or transmitter, and talk with the communication partner. It becomes medium (3019) (S3208). The connection device 2 is a wireless telephone 103
-When the voice channel connection completion signal (3006) from A is received, the voice channel connection completion (300
5) is transmitted. In step S3108, the main device 1 transmits the extension communication permission (3015) addressed to the wireless telephone 103-B to the connection device 2, and then the connection device 2
Sends an extension communication permission signal (30
16) is transmitted. This extension communication permission signal (3016)
Also includes communication resource information such as hopping patterns and voice channel numbers used for direct communication.

The wireless telephone 103-B is connected to the connection device 2
When the extension communication permission signal (3016) is received (S3
305), and transmits a voice signal connection completion signal (3018) to the connection adapter 2 (S3306). In response to this, the connection device 2 completes the voice channel connection to the main device 1 (3
017) is transmitted. Then, the wireless telephone 103-
B shifts to the voice channel obtained from the communication resource information in the extension communication permission signal (3016), and the call (30
19). That is, in the subsequent direct communication between the wireless dedicated telephones, the control data and the voice data exchanged between the telephones are communicated through this voice channel. Specifically, in Tn and Rn of the PPF frame of FIG.
2, the control data is a D time slot,
Voice data is communicated in the B time slot.

Even during direct communication between telephones, the frequency is switched to the frequency at which the PCF is transmitted at the timing of the beginning of the frame to receive LCCH-T or LCCH-T.
The ability to send -R is a major feature of this system. By doing this,
It is possible to receive data from the main device even during communication on the extension line, and it is possible to deal with services such as incoming calls.

Now, the main unit 1 completes the connection of the voice signal from the wireless telephone 103-B from the connection unit 2 (3017).
If the message is received (S3109), the wireless dedicated telephone 10
It is determined that the 3-A and the wireless telephone 103-B have started a call, and waits for the extension communication to end (S3110). On the other hand, wireless-only telephone 103-A and wireless-only telephone 103-
B is the state of the wireless line and the key matrix 41 of the user
Monitor 4

The telephone call is completed, and the wireless telephone 103-A
When the on-hook signal is detected (S3209), the wireless telephone 103-A transmits an on-hook signal (3020) to the wireless telephone 103-B. On the other hand, the wireless telephone 103-B which has received the on-hook signal (3020) transmits the on-hook confirmation signal (3021) by the control information in the call channel.

Upon receiving this on-hook confirmation signal (3021), the wireless telephone 103-A switches the call channel to the logical control channel, and the extension communication end signal (302
3) is transmitted to the connection device 2. In response to this, the connection adapter 2 transmits extension communication end (3022) to the main device 1.
When the main device 1 receives the extension communication end (3022) (S3110), the connection device 2 disconnects the voice channel (30).
24, 3026) is transmitted (S3111). In response to this, the connection adapter 2 sends a voice channel disconnect signal (3025) to the wireless dedicated telephone 103-A and a voice channel disconnected signal (3027) to the wireless dedicated telephone 103-B.
Send Upon receiving the voice channel disconnection signal (3025) (S3213), the wireless telephone 103-A disconnects the voice channel (S3214). Similarly, the wireless telephone 103-B also receives the voice channel disconnection signal (302
7) is received (S3310), the wireless dedicated telephone 10
3-B disconnects the voice channel (S3311). Then, the main device 1 releases the communication resources such as the voice channel allocated to the wireless telephones A and B (S3112).

By the above procedure, a direct call between extension lines can be realized.

The basic part of the above-mentioned procedure is also used in the data transmission from the computer to the printer, which will be described below. 6. Processing at the time of data transmission from the computer to the printer The wireless switching system according to the present embodiment is capable of high-speed data transmission between extensions as one of its features. Therefore,
A process for transmitting data from the computer to the printer in a burst will be described. Note that the control procedure between the main device and the terminal is basically the same as the processing for the inter-extension call described above, and therefore the different portions will be mainly described here.

First, when the printing application program of the computer is started, a wireless adapter driver (not shown) incorporated in the data terminal operates, and the wireless adapter 4 (see FIG. 2) is operated via the communication interface section. Send data request and destination number (extension number of printer).

Next, the wireless adapter enters into a procedure for making a call between extension lines. That is, the logical control channel (LCCH-
R) sends an extension call request to the main unit. However,
Unlike the above-mentioned extension call, since it is necessary to use a burst data frame (BDF), the extension call request event information contains information requesting BDF allocation.

Upon receiving the extension call request event information, the main unit notifies the wireless adapter connected to the printer, which is the data transmission destination, of the incoming call using the logical control channel (LCCH-T). Then, when the main device receives the incoming call permission from the printer side, it assigns the BDF hopping pattern to be used to the sending side computer and the receiving side printer. After the hopping pattern is assigned, the computer and the printer start data communication without going through the main device.

Since the BDF is for carrying out burst transmission, it normally carries out unidirectional data transmission, but at the start of communication, the computer and the printer carry out transmission sequentially for each frame. During this period, the computer determines how many frames of data should be continuously transmitted, and then how many frames of data should be transmitted from the printer. By taking such a procedure, it is possible to realize optimized channel use according to the application of the terminal.

After the above procedure is completed, the wireless adapter performs error correction processing on the print data received from the computer, assembles a frame, and then transmits the data to the printer. Here, by using BDF, 450
Transmission of about kbps is possible.

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. 7. Processing at the time of personal computer communication access from the computer to the public network This system enables not only high-speed data transmission within the system, but also data transmission to the public network. For example, it can support applications such as personal computer communication. it can. Here, the basic operation procedure is also the same as the case of making an outside line from the wireless-only telephone, and hence the following description will be focused on the different parts.

When the personal computer communication application program of the computer is started, the wireless adapter driver incorporated in the data terminal operates to send an outside line transmission request to the wireless adapter 4 via the communication interface section. As a result, the wireless adapter enters the outside line calling procedure. In other words, the logical control channel (LCCH-R) is used to send an external line transmission request to the main device side and receive an allocation of an empty slot of PCF. After the slot is assigned, the data is transmitted using the slot having the PCF transmission rate of 32 kbps.

On the other hand, in order to transmit data to the analog public line, it is necessary to modulate the data by the modem. Therefore, when transmitting the data to the outside line (analog specification), the data is modemd inside the wireless adapter 4. Modulated by
It is set in a state capable of transmission in the voice band (300 Hz to 3.4 KHz). Since the data modulated by such a modem can be treated as voice information, this information is ADP.
It will be CM encoded and frame assembled.

By following the procedure described above, it becomes possible to support applications such as personal computer communication using the same procedure as that of a normal voice call.

As described above, in this system, in addition to the call function that is used in the conventional telephone exchange,
High-speed data transmission is also possible. In particular, the data terminal enables high-speed data transmission within the system and also enables access to the public network. 8. Hopping Pattern (Frequency) Allocation Method Although the method of notifying the wireless terminals in the present system of the hopping pattern (frequency) has been described, the method of allocating the hopping pattern (frequency) to each wireless terminal performed by the main device will be described below with reference to FIG. And FIG. 31. (8.1) Hopping pattern In the hopping pattern (hereinafter, HP), the same frequency does not overlap in the same time zone (same time slot), and 1
The system decides to use the available frequencies uniformly in the slot period.

FIG. 30 is a diagram showing an example of a hopping pattern in this embodiment. In the figure, Tn (1
≤n≤20 is a time slot, and HPn (1≤n≤2)
6) is a hopping pattern, and Fn (1 ≦ n ≦ 26) is 1
It is a frequency band of MHz. (8.2) Allocation order In FIG. 30, the connection device is P in a frequency band in which F1 to F26 are continuous (hence, Fn and Fn + 1 are adjacent to each other).
The odd numbered FP that is transmitting and receiving the CF frame
In this case, the remaining odd-numbered HPs are assigned to the extension communication using the PPF and BDF frames.

In the above allocation, when the number of inter-extension communication cannot be accommodated by the remaining odd-numbered HP, even-number HP is allocated to the inter-extension communication.

When the connection device uses an even-numbered HP, allocation is made from the remaining even-numbered HP for communication between extensions, and the number of communication between extensions cannot be accommodated by the remaining even-numbered FP. When the number becomes large, an odd-numbered HP is assigned to the extension communication.

Further, the even / odd number of HP used by the connection device is changed in a fixed time. (8.3) Hopping Pattern Allocation Next, the hopping pattern allocation operation according to this embodiment will be described below with reference to the flowchart shown in FIG.

First, the main unit 1 is the wireless terminal 1 in the system.
If a call origination request is received from the wireless terminal 103 in the system while waiting for a call origination request from the communication terminal 03 (S130).
1), the transmission type from the above-mentioned CCH-R information, that is,
Confirm whether the call is to an outside line or an inside line (S1302)
Then, the determination is made (S1303). Here, in the case where the transmission request is transmission to an outside line, the PC of the frequency used by the connection device (the frequency for transmitting / receiving the PCF frame) is used.
Check if there is an empty slot in the F frame (S130
4) and make a determination (S1305). Here, if there is no empty slot, the information of the call rejection is incorporated in the LCCH-T of the PCF frame, and the call origination terminal is notified (S1306). If there is an empty slot, the operation transits to the outside line transmission processing (S1307).

On the other hand, when the call request is to the extension, it is confirmed whether there is an empty slot in the HP currently used for the extension call (S1308), and it is determined (S1309). Here, when there is an empty slot in the FP currently used for the extension call, the information of the FP having the slot and the empty slot information in the HP are notified to the terminal of the LCCH-T embedded transmission request source of the PCF frame. (1317).

If there is no empty slot in the HP currently used for the extension call, it is confirmed whether there is an empty FP in the system (S1310), and the determination is made (S131).
1). Here, if there is no empty pattern, the information of the call rejection is incorporated in the LCCH-T of the PCF frame and the terminal of the call originator is notified (S1312). However, when there is an empty pattern, the number of remaining HP is confirmed (S13
13) and make a determination (S1314). Here, when the number of HPs in use (including the HP used by the connection device) is 1/2 or less of the HPs available in the system (the same even number as the HP used by the connection device described above). / When HP remains in the odd group), the remaining HP of the same even / odd group as the FP used by the connection device is assigned to the extension call (S1316).

On the other hand, when the number of HPs in use (including the HPs used by the connection device) exceeds 1/2 of the HPs available in the system (the above-mentioned connection device is used). If no HP remains in the same even / odd group as the HP), the remaining HP in the even / odd group different from the FP used by the connection device is assigned to the extension call (S1315). And the HP determined as described above
PCF and the information of the slot used in the HP
The terminal which is the originator of the transmission is notified in the LCCH-T of the frame (S1317).

By the above processing, the same frequency can be effectively used without overlapping in the same time zone (same time slot) in the system, and if the number of communication terminals is less than a certain number, the same frequency can be obtained. Since it is possible to give a margin to the frequency interval used in the time zone (the same time slot), it is possible to prevent the interference of the adjacent channels.

[Modification] In the above-described embodiment, the frequency used for communication is controlled by notifying the terminal of the hopping pattern. However, the LCCH-T in the PPF frame is used for each slot. It is also possible to notify the frequency to be used. In this case, since the terminal does not need to store all the hopping patterns used in the system, the configuration can be simplified.

FIG. 32 is a diagram showing a hopping pattern in the modified example. The hopping pattern shown in the figure is composed of two groups of frequencies in bands that are not adjacent to each other in terms of frequency and two cycles in which the groups are used alternately. <Explanation of Operation> In FIG. 32, when the connecting device is transmitting / receiving the PCF frame by the HP of the group 1, P
For the extension communication using the PF and BDF frames, the remaining HPs of group 1 are assigned. Then, when the number of inter-extension communication becomes a number that cannot be accommodated by the remaining HP of group 1, HP of group 2 is allocated to inter-extension communication.

(When the connecting device uses the HP of the group 2, the HP of the remaining group 2 is assigned to the communication between the extensions, and the number of the communication between the extensions cannot be accommodated by the HP of the remaining group 2. If it becomes, group 1 will be used for communication between extensions.
HP will be allocated. ) When the cycle 1 is completed in the above, H to be used
Change P to group 2 and continue operation. Then, cycles 1 and 2 make up one cycle, and one cycle is 100 m.
s.

As described above, also in the modified example, it is possible to obtain the same effect as that of the above-described embodiment.

[Embodiment 2] In the embodiment described above,
An analog public network is assumed as the public line. However, the development of digital public networks (for example, ISDN) is rapidly progressing at present, and it is conceivable to accommodate ISDN in the system in the future.

FIG. 33 is a diagram showing the configuration of a wireless adapter for ISDN. In the figure, 1001 is ISDN
Terminal, 1002 is a wireless adapter for ISDN terminal, 100
A wireless unit 3 and a main controller 1004 are composed of a CPU, a peripheral device for interrupt control, an oscillator for a system clock, etc., and control each block in the wireless adapter. A memory 1005 is composed of a ROM for storing programs used by the main control unit, a RAM used as a buffer area for various processes, and the like.
Reference numeral 1006 denotes an assembly / disassembly unit of the ISDN frame.
The layer 1 processing of the SDN frame is performed. That is, AM
It has a function of converting an I code into a binary code, a function of multiplexing B channel data and D channel data, a function of detecting activation of layer 1, and the like. Reference numeral 1009 denotes a channel codec for frame processing and wireless control.
It has a function of assembling data received from N terminals into a radio frame.

FIG. 34 is a diagram showing a frame for data communication between the ISDN terminal and the main unit 1. In the figure, FSYN is a synchronization signal, LCCH-T is a logical control channel sent from the main unit 1 to the wireless telephone 3, and LCC.
HR is a logical control channel sent from the wireless dedicated telephone 3 to the main device 1, ISDN-T is a data slot sent from the main device 1 to the ISDN wireless adapter 1002, and 6
2 audio channels of 4 kbps and 16 kb
One control channel of ps is multiplexed.
ISDN-R is a data slot to be transmitted from the ISDN wireless adapter 1001 to the main device 1, and two 64 kbps voice channels and one 16 kbps control channel are multiplexed.

In the above configuration, the ISDN terminal 100
The 192 kbps data received from the 1 is the ISDN frame assembling / disassembling unit 100 in the wireless adapter 1002.
It is decomposed at 6, and only B channel data and D channel data are extracted. Taken out, total 144 kbps
The minute data is put in the ISDN-T in the frame shown in FIG. 31 and transmitted to the main device 1 side.

On the contrary, the data from the main unit 1 is ISDN-
Received by R. Predetermined layer 1 information is added to the received 144 kbps data, converted into an AMI code, and then transmitted to the ISDN terminal 1001.

Next, the procedure in the case where the video conference terminal having ISDNi / f accesses the ISDN via the main unit 1 will be described below.

When a call request is generated in the video conference terminal, ISDN layers 1 to 3 are activated and data transmission is started. IS in the wireless adapter 1002
The DN frame assembling / disassembling unit 1006 extracts the D channel information and analyzes the contents. As a result, if the request is a call origination request (SetUp command), the wireless link acquisition procedure is started. In other words, the call origination request is sent to the main unit 1 and the main unit 1 which receives the call origination request from the wireless adapter 1002 makes a call origination request to the ISDN line by the same procedure as when making a call from the wireless dedicated telephone described in the above embodiment. Send out.

When such a calling procedure is completed and the other party responds, exchange control for connecting the B channel on the ISDN line side to the connecting device is performed. The B channel data received from the partner terminal is put into the ISDN-T of the radio frame and IS
It is sent to the DN terminal. Conversely, B sent by the ISDN terminal
The channel data is put in the ISDN-R of the radio frame and sent to the partner terminal.

In this manner, the wireless switching system I
It becomes possible to accommodate SDN terminals.

In order to carry out an application such as a video conference via ISDN, ISDN is not always required.
It is added that a terminal with an interface is not necessary. A terminal having a function of transmitting / receiving data at a transmission rate of 64 kbps or 128 kbps and having a function of wirelessly communicating with the main device can access the ISDN using the ISDN line interface in the main device. In particular, if the terminal itself incorporates the function of a wireless adapter, the ISDN frame assembling / disassembling unit or the like becomes unnecessary, and an application such as a video conference can be realized with a simpler configuration.

The slow frequency hopping is used in the above embodiments. However, a similar effect can be expected even when the direct spreading method is used. This is realized by using the direct spreading method for the wireless units of the connection device 2, the wireless telephone 3 and the wireless adapter 4 in the main device configuration diagram shown in FIG.

FIG. 35 is a diagram showing an example of a main unit transmission frame. The main unit transmission frame has control information and data slots for each wireless terminal. In the figure, FSYN is a synchronizing signal, Ck is control information from the main unit to the wireless terminal k, Tk is transmission data for it, and GT is a guard time.

FIG. 36 is a diagram showing an example of a slave unit transmission frame. Each wireless terminal transmits control information and data in a certain time slot assigned in the slave device transmission frame. In the figure, FSYN is a synchronization signal, GT is a guard time, Ck is control information for the main device of the wireless terminal k, and Tk is transmission data for it.

Each transmission data is preceded by a control signal, and the receiving device establishes communication by discriminating to which connection device or wireless terminal the transmission data is directed. In this wireless exchange system, extension communication and communication with an external line are performed, but the communication path probability is controlled by the main device, and the main device manages the state of each wireless terminal and all communication.

As described above, since the channel transmission rate can be increased by using the direct sequence communication method, it is possible to obtain the effect of increasing the number of slot multiplexing in the frame. Further, it is possible to realize a wireless exchange system having excellent confidentiality and noise resistance more than when the FH method is used.

As described above, according to the embodiment, the following effects can be obtained. 1. By using spread spectrum communication (SS) of frequency hopping (FH) system as the communication system, noise resistance and confidential communication characteristics are improved. 2. By notifying the terminal of frequency information to be used in time series at the start of communication (notifying the terminal of the frequency to be used at the start of communication as pattern information), the control procedure can be simplified. 3. By sharing the channel used for call and control,
Frequency utilization efficiency is improved. 4. In the extension communication, communication is performed without using the resources of the main device, so that the configuration of the main device can be lightened compared with the number of extension terminals. 5. It is possible to increase the number of extension terminals accommodated by avoiding duplicated use of frequencies of terminals (use of the same frequency by the main device and terminals at a specific time). 6. By avoiding overlapping use of frequencies between terminals (using the same frequency between terminals at a specific time), there is no competition between terminals, and it is possible to prevent deterioration of communication efficiency. 7. By preventing the adjacent channel interference, it becomes possible to prevent the deterioration of the communication quality and the deterioration of the communication efficiency.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of one device.

It goes without saying that the present invention can also be applied to the case where it is achieved by supplying a program to a system or an apparatus.

[0156]

As described above, according to the present invention, it is possible to prevent a decrease in communication efficiency and improve the convenience of the system.

[0157]

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a wireless switching system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a system and a configuration of a main device according to an embodiment.

FIG. 3 is a block diagram showing an internal configuration of a connection device 2.

FIG. 4 is a block diagram showing a configuration of a wireless telephone 3.

FIG. 5 is a block diagram showing an internal configuration of a wireless adapter.

FIG. 6 is a block diagram showing a configuration of a wireless adapter with a built-in modem.

FIG. 7 is a block diagram showing a configuration of a wireless unit commonly used.

FIG. 8 is a diagram showing a frame structure of a PCF.

FIG. 9 is a diagram showing a frame structure of PPF.

FIG. 10 is a diagram showing a frame structure of a BDF.

FIG. 11 is a diagram showing a frame structure of FSYN.

FIG. 12 is a diagram showing a frame structure of a voice channel.

FIG. 13 is a diagram showing a frame structure of LCCH-T.

FIG. 14 is a diagram showing a frame structure of LCCH-R.

FIG. 15 is a block diagram showing an internal configuration of a channel codec.

FIG. 16 is a diagram showing a concept of frequency hopping in the present system.

FIG. 17 is an operation sequence diagram when the power of the main device (connecting device) and the wireless terminal is turned on.

FIG. 18 is an operation flowchart when the power of the main device (connecting device) is turned on.

FIG. 19 is an operation flowchart when the wireless terminal is powered on according to the present embodiment.

FIG. 20 is an external line transmission sequence diagram according to the present embodiment.

FIG. 21 is an operation flowchart of the wireless telephone 3 at the time of outside line transmission according to the present embodiment.

FIG. 22 is an operation flowchart of the main device 1 when an outside line is transmitted according to the present embodiment.

FIG. 23 is an external line incoming sequence diagram according to the present embodiment.

FIG. 24 is an operation flowchart of the main device 1 when an outside line is received according to the present embodiment.

FIG. 25 is an operation flowchart of the wireless telephone when receiving an outside line according to the present embodiment.

FIG. 26 is a main device 1 for extension communication, a connection device 2, a calling-side wireless dedicated telephone 103-A, and a called-side wireless dedicated telephone 103.
It is a figure which shows the sequence of the control data of -B.

FIG. 27 is a flowchart showing an outline process of the main device 1.

FIG. 28 is a flowchart showing an outline process of a calling-side wireless telephone 103-A.

FIG. 29 is a flowchart showing the outline processing of the called-side wireless telephone 103-B.

FIG. 30 is a diagram showing a hopping pattern in Example.

FIG. 31 is a flowchart showing a hopping pattern allocation operation.

FIG. 32 is a diagram showing a hopping pattern in a modified example.

FIG. 33 is a diagram showing a configuration of a wireless adapter for ISDN.

FIG. 34 is a diagram showing a frame for data communication between the ISDN terminal and the main device 1.

FIG. 35 is a diagram showing an example of a main device transmission frame.

FIG. 36 is a diagram showing an example of a child device transmission frame.

FIG. 37 is a block diagram showing a configuration of a conventional wireless switching system and a configuration of a main device thereof.

FIG. 38 is a block diagram showing a configuration of a connection device in a conventional wireless switching system.

FIG. 39 is a block diagram showing a configuration of a wireless-only telephone housed in a conventional wireless exchange system.

FIG. 40 is an operation sequence diagram of a conventional wireless switching system.

[Explanation of symbols]

 1 main device 2 connection device 3 wireless dedicated phone 4 wireless adapter 5 data terminal 7 analog public line 9 digital public line 10 single telephone 11 facsimile

Claims (7)

[Claims] 1. A wireless switching system, which is connected to a public network and has a switching function and a plurality of wireless terminals, and assigning means for assigning different hopping patterns to frequencies that are switched at regular intervals, A wireless switching system comprising: a wireless communication unit that wirelessly communicates with a wireless terminal according to a hopping pattern assigned by the assigning unit. 2. The wireless switching system according to claim 1, wherein the main device notifies a plurality of wireless terminals of a hopping pattern to be used. 3. The wireless switching system according to claim 2, wherein the main device multiplexes and transmits a hopping pattern to be used together with call data and other control data. 4. The wireless switching system according to claim 1, wherein communication between the wireless terminals is performed without using a main device. 5. The wireless switching system according to claim 1, wherein different hopping patterns are used when communicating via the main device and when communicating without using the main device. 6. The wireless switching system according to claim 1, wherein the frequency used in each hopping pattern is not assigned to a certain number or more of wireless terminals at each time point. 7. The wireless switching system according to claim 1, wherein when the number of used hopping patterns is equal to or less than a predetermined value, a combination of hopping patterns having adjacent frequencies is not used at each time point. .