JP3376164B2 - Wireless switching system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a plurality of lines and a predetermined number of lines.
Main device that accommodates multiple connection devices that realize communication functions
And establish a wireless communication path with the plurality of connection devices.
And a wireless switching system having a plurality of terminals .

[0002]

2. Description of the Related Art In recent years, wireless communication has rapidly progressed and has been used in various fields. A telephone exchange device (including a key telephone device) is no exception, and a system has been proposed in which communication is performed wirelessly between a main device having a switching function and a wireless telephone. Therefore, a conventional wireless telephone exchange device will be described. <System Configuration> In a conventional wireless communication 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.

When communication is started, first, the voice communication channel to be used is determined by the control channel, and after the communication channel is determined, the channel is changed to that channel and thereafter the communication is continued using that channel. Become. The configuration and basic operation of each unit of the conventional wireless communication system will be described below. <Configuration of Main Device> FIG. 30 is a block diagram showing a configuration of a conventional wireless communication system and a configuration 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 the control from the main device J1 and wirelessly controls the wireless terminal in order to allow the system to accommodate a wireless terminal (a wireless dedicated telephone described later) that is wirelessly connected one-to-one. To establish a wireless transmission path. Further, the wireless telephone J3 is a terminal for making a call with an outside line accommodated in the main device J1 and an extension call via the connection device J2.

The main device J1 includes PSTN (existing public telephone network) J4 and PSTN (J
4) an external line from PSTN line J5 and one of the terminals connected to main device J1 SLT (single telephone) J6
Is housed. Hereinafter, the internal configuration of the main device J1 will be described. As shown in FIG. 30, 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
The N line i / f (J105) detects an incoming call for accommodating the PSTN line J5 under the control of the CPU (J101).
Performs PSTN line control such as selection signal transmission and DC loop closure. In addition, SLTi / f (J106) is a CPU
Under the control of (J101), 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 during a power failure. , A call circuit, a display, etc. 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. 31 is a block diagram showing the configuration of the connection device J2 in the conventional wireless communication 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). When the received signal is a voice signal, descrambling, decompression, etc. are performed. PCMCODEC (J20
Output to 6). The voice processing LSI is the CPU at the same time.
The control data transmitted from (J201) is D / A converted and transmitted to the wireless unit section J208.
The wireless unit J208 is provided by performing processing such as scrambling and compression on the audio signal from the CMCODEC (J206).
Send to.

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. 32 is a block diagram showing the configuration of a radio dedicated telephone J3 housed in a conventional radio communication 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 various work areas for calculation.

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. The voice processing LSI (J306) is a CPU (J30
Under the control of 1), the demodulated signal from the wireless unit J307 is received, and when the signal is control data, A / D conversion is performed and output to the CPU (J301), and the received signal is a voice signal. In this case, descrambling, decompression, etc. are performed and output to the speech path unit J305, and the CP
The control data transmitted from U (J301) is D / A converted and transmitted to the wireless unit section J307, and the communication path section J3
The audio signal from 05 is subjected to processing such as scrambling and compression, and is 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 is used by the system user to input / output a voice signal for a call, and the microphone J309 is
The sound signal is input as a sound collection, 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 J31
Reference numeral 1 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 Communication System> Next, a basic operation of the conventional wireless communication system will be described.

FIG. 33 is an operation sequence diagram of a conventional wireless communication 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. Upon receiving the above-mentioned movement notification signal, the connection device J2 confirms the shift to the call channel and transmits a channel movement response signal to the wireless telephone J3 (J404). Continuing, connection device J2
Sends a line connection notification to the main device J1 (J40
5) After that, the state transits 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), issues a voice connection request from the main device J1 to the connection device J2 (J408), and connects from the connection device J2 to the wireless only. When the call is made to the telephone J3 (J409), a dial tone is sent (J410). Then, a dial call is made (J411), and thereafter, the main device J1 performs a call operation to an outside line, and when the other party answers, the main device J1 shifts to a call (J412).

With the procedure described above, the wireless telephone can make a call through the public line. For incoming calls, the call is started by acquiring the wireless call channel by the same procedure as above. , You can continue.

[0017]

However, in the above-mentioned conventional telephone exchange system, since the narrow band FM is used as the radio modulation system, when connecting devices are added for the purpose of expanding the communication area, each connecting device is connected. Since all the communication channels are shared, adjacent channel interference is likely to occur, and there is a problem that communication channels that can be used for communication decrease.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a wireless switching system in which a communication area can be easily expanded.

[0019]

In order to achieve the above-mentioned object, the present invention provides a main device for accommodating a plurality of connecting devices for realizing a plurality of lines and a predetermined communication function, and a plurality of the connecting devices. In a wireless switching system having a plurality of terminals for establishing a wireless communication path between them, a means for storing a unique system identification code unique to the wireless switching system, and the plurality of stored system identification codes. Means for transmitting the transmitted system identification code to the plurality of terminals and performing a spread spectrum process on the transmitted system identification code.
Stored in any one of a number of connected devices
And the main device reads from any one of the connecting devices.
The system identification code including the connection device
To the other connection devices, and the plurality of terminals establish the communication path with the identified connection device based on the system identification code subjected to the spread spectrum processing.

In the above configuration, it is possible to connect by adding a connecting device.
Functions to expand the communication area .

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In recent years, spread spectrum communication has attracted particular attention among digital wireless communication systems. This spread spectrum communication is known as a technique that spreads information to be transmitted in a wide band to enhance the interference removal capability and to provide excellent confidentiality. At present, frequencies in the 2.4 GHz band are allocated for spread spectrum communication in various countries around the world, and their use is spreading all over the world.

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 which is ten times to several hundred times that speed. A wide band is used by performing spread modulation.

In the following embodiments, a case will be described in which the digital radio communication by the frequency hopping method is used for extension transmission of the radio communication system. <System Configuration> FIG. 1 is a diagram showing an overall configuration of a wireless communication 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 that performs control data communication with the exchange 101 and direct data communication with the terminals-
A to 104-E.

The data terminal device according to the present embodiment is "a terminal (data terminal) having a function of transmitting an arbitrary amount of data in a burst, and a radio that controls wireless 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 various other terminals such as an electronic camera, a video camera, and a scanner (not shown) that perform data processing correspond to the bridge 104-F.

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, a main unit 1 is a main part of the present system which 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 wireless telephone 3 is a telephone for making a call with an external line accommodated in the main device 1 through the connection device 2 and for making an extension call with each other. The wireless adapter 4 is connected to, for example, a data terminal 5 such as a personal computer or a printer, an SLT (single telephone) 10, a facsimile (FAX) 11, and an ISDN terminal 12 to wirelessly transmit data between similarly configured data terminals. It is an adapter that enables transmission.

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 I which is one of external line networks.
SDN (Integrated Services Digital Communication Network) 8, ISDN 8
The ISDN line 9 which is the line from the. 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 and controls the entire main unit including exchange control. ROM202 is
A control program for the CPU 201 is stored in the RAM 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 speech path unit 204 controls call exchange (time division exchange), and the PSTN line i /
f205 is a PSTN line 7 under the control of the CPU 201.
PSTN line control such as incoming call detection, selection signal transmission, DC loop closure, etc. 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 S
LTi / f207 is an SLT under the control of the CPU 201.
Power supply for housing 10, loop detection, selection signal reception, call signal transmission, etc. are performed.

The telephone unit 208, when energized, has the CPU 2
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 channel codec 307 is a CP
Under the control of U301, the ADPCM-coded speech signal and control signal are subjected to scrambling and the like, and these signals are time-division multiplexed into a predetermined frame. Further, the wireless unit 308, under the control of the CPU 301,
The framed digital signal from the channel codec 307 is modulated and processed so that it can be wirelessly transmitted, and then transmitted to the antenna, and the signal wirelessly received from the antenna is demodulated into a framed digital signal. To process. <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 a handset 410, a microphone 411, and a speaker 412, which will be described later, under the control of the CPU 401. AD
The PCM codec 406, under the control of the CPU 401,
An analog voice signal from the communication path unit 405 is converted into an ADPCM code, which is then converted into a channel codec 40.
7, the ADPCM-coded call signal from the channel codec 407 is converted into an analog voice signal, and the analog voice signal 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 is composed of 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-mentioned 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, such as ISA buses, PCMCIA (personal computer memory card int)
international association) i / f etc. are applicable. The terminal control unit 507 controls the data terminal 5 via the communication i / f 506.
01 controls the various communication controls necessary for data communication between 01 and the wireless adapter 502. 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 is the wireless adapter 502.
Provides the timing signals used by each internal block.

FIG. 6 is a block diagram showing the configuration of a wireless adapter with a built-in modem, which is required when performing data transmission to a public line. In the figure, the same components as those of the wireless adapter shown in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted here. In FIG. 6, modem 511 modulates data into a voice band signal,
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 transmitted to the main device 1 via the wireless unit 503. <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. P
LL618 and these VCO616, LPF61
7, the PLL 618 constitutes a frequency synthesizer of the receiving system.

Further, a VCO 61 for generating a carrier signal
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-mentioned various PLs.
The reference clock for L618, 621, and 624, and the baseband filter 626 are filters for band limitation of transmission data (baseband signal). <Description of Operation of Radio Unit> (1) Operation at Transmission In the radio unit, data (digital data) input from an external circuit such as a processor (not shown) is subjected to band limitation by the baseband filter 626 and then transmitted. It is input to the modulation terminal of the system VCO 622. 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 the unnecessary band signal removed by the BPF 603, and then the antenna 601.
Radio waves are emitted from a and b into space. (2) Operation during reception The signal received by the antennas 601a and 601b is the 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 a 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 a frequency of IF 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 has been shifted by the 90 ° phase shifter 613 and the original signal. This quadrature detector 6
The data (analog data) demodulated by 14 is then waveform-shaped by the comparator 615 as digital data and output to an external circuit. <Description of 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-only telephone, LCC.
H-T is a logical control channel sent from the wireless-only telephone to the main unit, T1, T2, T3, T4 are voice channels sent to four different wireless-only telephones, R1, R2, R
3 and R4 are voice channels sent from four different wireless telephones, and GT is a guard time. Further, F1 and F3 shown in the figure are frequency channels used when the above frame is wirelessly transmitted, and indicate 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 are voice channels sent to three different wireless dedicated telephones, R1, R2 and R3 are voice channels transmitted from three different wireless dedicated telephones, GT is a guard time, and RV is a reserved bit. Represents

Further, F1, F3, F5, F in the figure
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. Switch to F5, which is secured for communication, and perform communication between wireless dedicated telephones. 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, which is secured for the communication between the wireless dedicated telephones, is performed until the communication between the wireless dedicated telephones is completed. repeat.

In the BDF shown in FIG. 10, 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. , 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 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 burst data communication is repeated until the burst data communication ends.

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. The numbers in the figure indicate the number of bits of each signal.

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 a carrier sense time for confirming that the previous frame has ended, and for confirming whether another wireless device is not emitting a radio wave, PR1
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. Here again, the numbers in the figure indicate the number of bits.

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 radio section 802, an ADPCM codec 803 built in a wireless telephone, etc., and a CPU 804 of a wireless 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. ADP
The CM codec i / f 806 exchanges serial data and a synchronous clock for exchanging an audio signal with the ADPCM codec 803. In addition, the transmission frame processing unit 808 determines that the ADPCM codec 803
And the logical control data input from the CPU 804 are assembled into the 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) Operation at the time of transmission At the time of transmission, the control information 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) Operation at the time of reception The radio control unit 805 switches the radio unit 802 to reception when the data to be transmitted is completed, 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, control information LCC from the main device that is waited at the frequency assigned in advance by the main device and is sent periodically
HT is received. 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 calling request on the wireless telephone side. 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 unit is set to the LCCH
-Send to main device with R. Thus, the wireless-only telephone repeats the above procedure until a call is made or an incoming call is made. (3-2) A case where the wireless telephone A makes a call during communication will be described as an example. It is assumed that the wireless telephone A exchanges the LCCH with the main device on the frequency channel F1 during no communication.
Until the call is made, the wireless telephone A receives the above (3-
In the procedure described in 1) when there is no communication, the frequency channel F1
Is monitoring the LCCH from the main unit. And
When a call is originated at the wireless telephone A, the call request is put in the LCCH-R to be sent to the main unit and sent to the main unit by the procedure shown in (3-1). 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 exchange of control information after connecting to the main device is performed by the D channel information in the Tn and Rn frames.

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 end of the communication, 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, and
Hopping the frequency channel for each frame. Therefore, the length of one cycle of one hopping pattern is 10
It is 0 ms. In FIG. 16, different hopping patterns are shown by different patterns, and a pattern that the same frequency is not used at the same time is used in each frame. 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. <Explanation of basic operation procedure> In this system, logical control channels (LCCHT and LCCHR) that are time-division multiplexed in a frame before using a communication channel.
Is used to determine the slot to use and the hopping pattern. Further, 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 the communication using the call slot, the logical unit is notified using the logical control channel, and the slot and the hopping pattern are assigned. Then, after these allocations are made, it becomes possible to carry out a telephone call and data transmission. <Operation (setting mode) when the main device (connecting device) and the wireless terminal are powered on> This mode is a mode for registering an ID and setting the frequency of the logical control channel to be used.

FIG. 17 is a sequence diagram showing the operation when the power of the main device (connecting device) and the wireless terminal is turned on.
FIG. 19 is a flowchart showing the operation when the main device (connection device) is powered on, and FIG. 19 is a flowchart showing the operation when the wireless terminal is powered on. (1) Power-on operation of main device (connecting device) When the power switch (not shown) of the main device 1 (connecting device 2) body shown in FIG. 1 is turned on, the main device 1 (connecting device 2)
In step S2201 of FIG. 18, the main body is initialized, and in the following step S2202, the hopping pattern of frequency hopping used in wireless communication is individually determined for each connection device (2-A, 2-B). Subsequently, in step S2203, the hopping pattern (frequency hopping in the next unit time) is sent to the corresponding connection device. Then, each connecting device stores the received system ID in the EEPROM 303, and stores the system ID and the PCF frame added with the frequency hopping pattern in the wireless terminal 103 (see FIG. 1).
(Refer to), and send with the hopping pattern of this connection device.

At this time, the ID part (see FIG. 11) in the PCF frame contains the system ID, the NFR part contains the information of the frequency hopping in the next unit time in the hopping pattern, and The LCCH unit (see FIG. 13) includes information on an idle control channel that can be used on the wireless terminal side. By the above operation of the main device (connecting device), the wireless terminal 103 identifies whether the connecting device that establishes the communication path is the connecting device 2-A or the connecting device 2-B, by the difference of the hopping pattern. With
Since the system IDs transmitted by the respective connection devices are the same, the wireless terminal 103 can communicate with both the connection devices 2-A and 2-B. As a result, an independent communication area can be newly established by adding one connection device.

Next, when it is determined that the main device 1 (connection device 2) has received the information for position registration such as the system ID and the wireless terminal ID from the wireless terminal 103 (YES in step S2204). In step S2205, the ID of the wireless terminal 103 is stored, the control channel for transmitting the wireless communication control information addressed to the wireless terminal 103 is determined,
In step S2206, this is notified to the wireless terminal 103.

The above operation is performed by the sequence 2 shown in FIG.
101 to 2103. (2) Operation when the power of the wireless terminal 103 is turned on When the power switch of the main body of the wireless terminal 103 is turned on, the setting mode is set, and an internal confirmation is made as to whether or not the initialization processing is completed (step S2300 in FIG. 19). Then, if the initialization is completed, the wireless terminal 103 advances the process to step S2303, but if the initialization is not completed, the wireless terminal 103 initializes the main body as shown in step S2301. Then, in step S2302, if the ID of the wireless terminal 103 is manually input,
The wireless terminal 103 stores this ID.

In step S2302, the PCF frame from the main device 1 (connecting device 2) is received, so that the reception standby state is set at an arbitrary frequency. Here, if there is no frame reception for a certain period of time, the frequency is changed to a different frequency and the reception standby state is repeated again. Continued Step S23
If the PCF frame from the main device 1 (connection device 2) can be received in 04, in step S2305, the system ID is recognized and stored by the ID part (see FIG. 11) in the PCF frame, and the LCCH part ( Free channel information (frequency for transmitting a PCF frame from the wireless terminal to the main device) is acquired from (see FIG. 13). Also, the frequency to hop next in the unit time is acquired from the NFR part in the PCF frame, the wireless terminal 103 moves the received frequency to that frequency, and waits for the next PCF frame. Wireless terminal 10
3 repeats this operation, recognizes the frequency hopping pattern, and stores it (step S2306).

When the hopping pattern and the system ID are known, the radio terminal 103 adds a system ID and ID information of its own radio terminal 103 to the frame (sequence of FIG. 17) in the idle control channel obtained from the LCCH section. 2102) (see 2102) to the main device (step S2307). After receiving the control channel frequency designation information from the main device 1 (connection device 2) after the above processing, the wireless terminal 103 starts discontinuous reception on the designated control channel (step S230).
8) and shifts from the setting mode to the normal mode.

By taking the above steps, for example,
Even when the wireless terminal 103 starts communication at the destination, it is possible to easily establish a communication path with a new connection device. <Processing for making an outside line from the wireless telephone> FIG.
2 is a sequence diagram of outside line transmission in the present embodiment, and FIG.
FIG. 1 is a flow chart showing the operation of the wireless telephone 3 at the time of making an outside line call, and FIG.

In the wireless telephone 3 according to the present embodiment, when the outside line key arranged in the key matrix 413 is pressed (step S2501 in FIG. 21), the wireless telephone 3 is displayed on the display unit 414 corresponding to the pressed outside line button. The external line LED of No. 2 is transmitted and blinked (step S2502), and an external line transmission signal (2402 in FIG. 20) is transmitted to the main device 1 via the connection device 2 (step S2503). This external line transmission signal is transmitted on the wireless link between the wireless-only telephone 3 and the connection device 2 by LCCH- of the PCF frame shown in FIG.
In the connection device 2, the main device i / f shown in FIG.
The main device is notified by 305.

When receiving the outside line transmission signal (2401 in FIG. 20), the main unit 1 judges whether or not the outside line can be transmitted (step S2601 in FIG. 22), and if the outside line is free and can be transmitted, the line is transmitted. The external line and which voice channel (T1 to T4, R1 to R4) of the PCF frame to use are determined. Then, the outside line transmission permission (2403) with the determined voice channel number as a parameter is transmitted to the wireless telephone 3 via the connection device 2 (step S2).
602), and the outside line is captured (step S2603). This outside line transmission permission is given by LCCH- of the PCF frame.
Sent at T.

Upon receiving the outside line transmission permission signal (2404) (step S2504), the wireless telephone 3 synchronizes with the voice channel instructed by the parameter transmitted by this permission signal. Then, when the shift to the voice channel in the wireless telephone 3 is completed, the LCCH
A voice channel connection completion signal (2406) is transmitted by -R (step S2505).

When the connection device 2 receives the outside line transmission permission (2403) from the main device 1, the connection device 2 receives a predetermined voice channel by the channel codec 307 and creates a route for passing the voice channel to the main device 1 for exclusive use of wireless communication. The completion of the voice channel connection (2406) from the telephone 3 is notified to the main device 1 as the completion of the voice channel connection (2405). When the main device 1 receives the above-mentioned voice channel connection completion (2405) (step S2604), it determines that the wireless dedicated telephone 3 side is ready, and turns on the outside line LED, for example, in green, so that the connection device is connected. 2 External line display Green constant light instruction (2
407) is transmitted (step S2605). Further, the communication path with the captured outside line is connected (step S260).
6).

On the other hand, the wireless dedicated telephone 3 receives the outside line display green constant light instruction signal (2408) from the connection device 2 (step S2506), turns on the outside line LED in green, and the communication path inside the dedicated wireless telephone 3 is reached. To hear the dial tone (2411) (step S250).
7). Also, in order to turn on the corresponding outside line LEDs of the wireless dedicated telephones 3 other than the wireless dedicated telephone 3 which has transmitted the outside line in red, the outside line display red constant light instruction (2409, 2410) is transmitted.

Next, the wireless telephone 3 which has received the dial operation in the key matrix 413 transmits a dial signal (2413) to the main unit 1 (step S250).
8). The end of this dial operation times out (T.
O) is monitored (step S2509), and when the time is out, the call is in progress (step S2510). Upon receiving the first digit of the dial (2412) (step S2607), the main device 1 starts transmitting a dial signal to the outside line, and also monitors the dial transmission due to timeout (step S2608). When the dial transmission is completed, the call is in progress (step S2609).

When the telephone call is completed and the wireless telephone 3 is on-hook (YES in step S2511), an on-hook signal (2416) is sent to the connection device 2 (step S2512). When the on-hook (2415) is transmitted to the main device 1 (YES in step S2610).
S), the main device 1 transmits a voice channel disconnection (2417) (step S2611). Further, the main device 1 is
The assignment of the voice channel to the wireless telephone 3 is released. After that, since the outside line LED of the wireless telephone 3 is turned off, the outside line display turn-off instruction (241
9), but the external device display turn-off instruction signal (2
420) is transmitted (step S2612).

Upon receiving the voice channel disconnection signal (2418), the wireless telephone 3 releases the call path (step S
2513), and subsequently, based on the received outside line display turn-off instruction signal (2420, 2422), the corresponding outside line LED
Is turned off (step S2514). <Processing When Receiving an Outside Line to the Wireless Telephone> FIG. 23 is a sequence diagram of an outside line receiving in the present embodiment.
3 is a flowchart showing the operation of the main device when an external line is received.

When it is determined in step S2801 in FIG. 24 that an incoming call has been received from the public line 102 to the main device 1, the main device 1 proceeds to step S2802 from the connection device 2 to the external telephones 103-A, B for the outside line. Incoming signal 2703, 2
705 is transmitted. If the off-hook signal 106 is received in step S2803, step S280
4, the wireless telephone 103-A that has transmitted the off-hook signal 2706 is sent to the HP used for the outside line call.
And an external line response permission signal 2709 carrying information such as a voice channel number.

If the voice channel connection completion signal 2711 is received in step S2805, step S2806 is executed.
The main device 1 is connected to the connection device 2 and the wireless telephone 10
The call display signals 2712 and 2713 are issued to 3-A, and in step S2807 the outside line incoming call stop signal 2717 is transmitted to the other wireless dedicated telephone 103-B. Then, in step S2808, the wireless-only telephone 103-A is connected to the public line 102 based on the data from the wireless-only telephone 103-A, and the call is started. At this time, 2715 is exchanged during the call as data.

Further, the main device 1 performs step S2809.
And the on-hook signal 27 from the wireless telephone 103-A
The connection between the wireless dedicated telephone 103-A and the public line 102 is continued until 18 is received. If the off-hook signal 2718 is received, the process advances to step S2810,
The connection between the wireless telephone 103-A and the public line 102 is stopped, and the voice channel disconnection signal 2721 is issued. Then, in step S2811, the wireless dedicated telephone 10
An outside line busy display stop signal 2723 is transmitted to 3-B.

FIG. 25 is a flow chart showing the operation of the wireless-only telephone when an outside line is received in this embodiment. In step S2901 of the figure, when the wireless-only telephone receives the outside line incoming signal (2703 in FIG. 23) from the main unit 1, the wireless-only telephones 3-A and B ring a ring tone or the like,
In step S2902, it is detected whether the off-hook has been made. If the wireless telephone 103-A goes off-hook, the process advances to step S2903 to send an off-hook signal 2706 to the main device 1. Further, in step S2904, the outside line response permission signal 2 from the main unit 1
If 709 is sent, the voice channel is connected in step S2905, and the voice channel connection completion signal 2710 is transmitted to the main device 1.

At step S2906, from the main unit 1,
When the display instruction signal 2713 during a call is received via the connection device 2, the wireless telephone 103-A displays the display section 41.
A call display is displayed in 4, and the call is started in step S2907. Further, the call is continued until the on-hook is detected in step S2908, and when the on-hook is detected therein, the on-hook signal 2718 is sent to the connecting device 2 in step S2909. Will be sent.

When the voice channel disconnection signal 2721 is received in step S2910, the radio dedicated telephone 10
3-A disconnects the voice channel, erases the in-call display on the display unit 414, and ends the call. The cancellation of the in-call display is in accordance with the outside line in-use display stop signal 2723. On the other hand, in step S2902, an off-line termination signal is sent to the wireless private telephone 103-B because, for example, another wireless private telephone 103-A has started a call before being off-hooked by a certain wireless private telephone in step S2911. When 2717 is transmitted, the wireless telephone 1
03-B displays the display unit 41 in step S2912.
The outside line in use is displayed on 4. In addition, a wireless telephone 1
In step S2913, the 03-B continues to display the outside line busy display on the display unit 414 until the outside line busy display cancel signal 2723 arrives, and then the outside line busy display cancel signal 27 is displayed.
When 23 is reached, the outside line busy display is erased in step S2914. <Processing of extension-to-extension call> Next, two wireless dedicated telephones, which are managed by the same connection device, that is, when communicating with the main device, have the same connection device as an extension call Assuming that the above case is performed, the operation of each of the calling-side wireless dedicated telephone and the called-side wireless dedicated telephone will be described in detail.

FIG. 26 is a sequence diagram showing the data flow of the main device, the connection device, the calling side dedicated telephone and the called side dedicated telephone during the extension communication, and FIG. 27 shows the main device during the extension telephone communication. 28 is a flowchart showing the outline processing of FIG.
FIG. 29 is a flowchart showing an outline process in the calling side dedicated telephone, and FIG. 29 is a flowchart showing an outline process in the called side dedicated telephone. It should be noted that in the above processing flow, only relevant processing portions are described.

When the extension key arranged in the key matrix 413 is pressed in the wireless telephone 103-A (YES in step S3201 in FIG. 28), the wireless telephone 103-A receives the extension communication signal (300 in FIG. 26).
2) on the wireless link between the wireless-only telephone 103-A and the connection device 2, the LCC of the PCF frame shown in FIG.
It transmits using HR (step S3202). When the connection device 2 receives the transmitted extension communication signal (3002), the connection device 2 notifies the main device 1 as extension communication (3001).

Main device 1 which receives the extension communication (3001)
The CPU 201 in the inside is the wireless dedicated telephone 103-
If the extension of the extension is possible by analyzing the terminal attributes of A and the like (YES in step S3102), the extension communication permission using the LCCH-T of the PCF frame is given to the connection adapter 2 (3003).
Is sent to the wireless telephone 103-A from the connection device 2.
The extension communication permission signal (3004) is transmitted to (step S3104).

Next, the wireless telephone 103-A, which has received the dial information from the key matrix 413, transmits the dial information (3008) to the connection device 2 (step S3204 in FIG. 28). It should be noted that the final dial is monitored by time-out. When the main device 1 receives the dial information (3007) from the connection device 2 (step S in FIG. 27).
3105), analyzes the contents of the dial, and transmits the L of the PCF frame to the wireless dedicated telephone 103-B via the connection device 2.
Extension call using CCH-T (3009, 3010)
Is transmitted (step S3106). The wireless telephone 103-B which has received the extension incoming signal (3010)
The operator is notified of an incoming call by activating the speaker 412 or blinking an LED to prompt a response (step S3302 in FIG. 29). And the user is the key matrix 4
Operate 13 and wait for a response.

When the response from the user is detected, the wireless telephone 103-B sends the off-hook signal (3012).
Connection device 2 using the LCCH-R of the PCF frame.
The connection device 2 notifies the main device 1 as an off-hook (3011) (step S3304). Upon receiving the off-hook (3012) from the wireless-only telephone 103-B (YES in step S3107), the main device 1 sends an extension response (3013) to the connecting device 2 and also from the connecting device 2 to the wireless-only telephone 103-A. To the extension response (30
14) is transmitted to notify that the wireless telephone 103-B has responded. In the extension response (3013), the CPU 201 in the main unit 1 stores and manages the empty time slot and the hopping pattern in the RAM 203, and the voice channel (T1 to T1 in the PCF frame to be used.
T4, R1 to R4) and other communication resources are allocated to the direct communication between the wireless dedicated telephone 103-A and the wireless dedicated telephone 103-B, and this communication resource information is assigned to the L of the PCF frame.
The extension response (3014) using CCH-T is transmitted to the wireless dedicated telephone 103-A via the connection device 2 (step S3108).

Upon receiving the above-mentioned extension response signal (3014), the wireless telephone 103-A informs the connection device 2 of the L level.
A voice channel connection completion signal (30
06) is transmitted (step S3206). Then, the connection adapter 2 notifies the main device 1 of the voice channel connection completion command (3005) from the wireless telephone 103-A. At the same time, the main device 1 also allows the extension-use communication (3015) including the communication resource information such as the hopping pattern and the voice channel number used for direct communication to the wireless telephone 103-B via the connection device 2. , 3016) is transmitted (step S3108).

The wireless telephone 103-A, which has confirmed the partner's response by the above-mentioned extension response signal (3014), stops the ringing tone (ringback tone) of the other party and switches to the assigned logical channel so as to talk with the communication partner. hand,
The microphone 411 and the speaker 412 are controlled, and a call is established with the other party. On the other hand, extension communication permission signal (3016)
The wireless telephone 103-B that has received the message stops the ringing tone, synchronizes with the voice channel obtained from the communication resource information in the extension communication permission signal (3016), and connects the main device 1 via the connection device 2. To the audio signal connection completion signal (3017, 3018).

That is, during the direct communication of the wireless dedicated telephone after the above processing, the control data and the voice data exchanged between the telephones are communicated by the above-mentioned voice channel. Specifically, in Tn and Rn of the PPF frame shown in FIG. 9, as shown in FIG. 12, control data is communicated in a'D 'time slot, and voice data is communicated in a'B' time slot.

While the telephones are directly communicating with each other,
At the timing of the beginning of the frame, the PCF is switched to the transmitted frequency, LCCH-T reception, LCCH
-R transmission is possible. By doing so, it becomes possible to receive the data from the main device 1 even during the communication through the extension line, and it is possible to deal with the service such as an incoming call during a call.

The main unit 1 completes the voice channel connection from the wireless telephone 103-B via the connection unit 2 (30
If 17) is received (step S3109), it is judged that the telephones 103-A for exclusive use of wireless communication and 103-B for exclusive use of wireless communication have started a call, and waits for the extension communication to end (step S3110). On the other hand, the wireless-only telephone 103-A and the wireless-only telephone 103-B monitor the wireless line status and the user's operation of the key matrix 413.

The telephone call ends, and the wireless telephone 103-A
When the on-hook is detected at (YES at step S3209), the wireless dedicated telephone 103-A transmits the on-hook signal (3020) to the wireless dedicated telephone 103-B (step S3210). This on-hook signal (302
The wireless dedicated telephone 103-B, which has received 0), sends an on-hook confirmation signal (3021) to the wireless dedicated telephone 103-A.
Is transmitted by the control information in the communication channel (step S
3309).

Upon receiving the on-hook confirmation signal (3021) in step S3211, the wireless telephone 103-A
The communication channel is switched to the logical control channel, and the extension communication end signal (3023) is transmitted to the connection adapter 2 (step S3212). This ends the extension communication (302
2) is transmitted to the main device 1, a voice channel disconnection (3024) from the main device 1 to the connection device 2, and a voice channel disconnection from the connection device 2 to the wireless dedicated telephone 103-A. The signal (3025) is transmitted (steps S3213 and S3214). Similarly, the main device 1 also transmits a voice channel disconnection (3026, 3027) to the wireless dedicated telephone 103-B via the connection device 2 (steps S3310, S3111).

Next, the main unit 1 is connected to the wireless telephone 103.
-Release communication resources such as voice channels allocated to A and B (step S3112). As a result, the wireless telephones 103-A and 103-B which have received the voice channel disconnection signal (3025, 3027) also Free up resources. In this way, a direct call between the extensions can be realized, but the basic part of the above procedure is also used in the data transmission from the computer to the printer, which will be described below. <Processing during data transmission from computer to printer>
One of the characteristics of the wireless communication system according to the present embodiment is high-speed data transmission between extensions. 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, so here, the description will focus on the different parts.

First, when the printing application program of the computer is activated, 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 an extension call. 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 device 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 following these procedures, it is possible to use a channel optimized 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. It should be noted that not only data transmission from the computer to the printer but also data transmission between computers can be performed by the same procedure as above. <Processing during 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 corresponds to applications such as personal computer communication. be able to. Again, the basic operating procedure is
Since this is the same as the case of making an outside line from a wireless-only telephone, the description will be focused on the different points.

When the personal computer communication application program of the computer is activated, the wireless adapter driver incorporated in the data terminal operates and sends 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 a modem. Therefore, when transmitting data to an external 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, according to the present embodiment, the wireless terminal identifies the connection device that establishes the communication path by the difference in the hopping pattern, so that the wireless terminal can communicate with a plurality of connection devices. It is easy to expand the independent communication area by adding the connection device.

A modification of the above embodiment will be described below. << Modification 1 >> In the above embodiment, the call code (system ID) of the system is stored in the main device, but it may be stored in the connection device 2. In this case, one connection device, for example connection device 2
-The call code of this system (system I
D) will be stored. Then, after the main device 1 calls the system ID from the connection device 2-A, the other connection device 1-A is notified of this system ID. << Modification 2 >> In the system according to the above embodiment, the low frequency frequency hopping method is used as the spread spectrum modulation method, but the same effect as the above embodiment can be obtained even when the direct spread method is used. This is the main device whose configuration is shown in FIG.
This can be easily realized by using the direct spreading method for the wireless unit of the wireless adapter 4, and the plurality of connection devices are identified by the difference in the spreading code.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of one device. Further, it goes without saying that the present invention can be applied to the case where it is achieved by supplying a program to a system or an apparatus.

[0111]

As described above, according to the present invention,
A terminal communicates with multiple connection devices of the wireless switching system.
Since it is possible to communicate , it is possible to easily expand the communication area by adding a connecting device.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a wireless communication 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 a sequence diagram showing an operation when the main device (connecting device) and the wireless terminal are powered on.

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

FIG. 19 is a flowchart showing an operation when the wireless terminal is powered on.

FIG. 20 is a sequence diagram of outside line transmission in the example.

FIG. 21 is a flowchart showing the operation of the wireless-only telephone 3 when making an outside line call.

FIG. 22 is a flowchart showing an operation of main device 1 when an outside line is transmitted.

FIG. 23 is a sequence diagram of an incoming call from an outside line in the example.

FIG. 24 is a flowchart showing an operation of the main device when an outside line is received.

FIG. 25 is a flowchart showing the operation of the wireless telephone when an outside line is received.

FIG. 26 is a sequence diagram showing a data flow of a main device, a connection device, a calling side dedicated telephone, and a called side dedicated telephone during extension communication.

FIG. 27 is a flowchart showing an outline process in the main device during an extension call.

FIG. 28 is a flowchart showing the outline processing in the calling-side dedicated telephone.

FIG. 29 is a flowchart showing an outline process in a called-side dedicated telephone.

FIG. 30 is a block diagram showing a configuration of a conventional wireless communication system and a configuration of a main device thereof.

FIG. 31 is a connection device J in a conventional wireless communication system.
It is a block diagram which shows the structure of 2.

FIG. 32 is a block diagram showing a configuration of a wireless dedicated telephone J3 housed in a conventional wireless communication system.

FIG. 33 is an operation sequence diagram of a conventional wireless communication system.

[Explanation of symbols]

1 main device 2 connection device 3 Wireless dedicated telephone 4 wireless adapter 5 data terminal 7 analog public line 9 Digital public line 10 Single phone 11 Facsimile

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI H04Q 7/24 H04J 13/00 E 7/26 7/28 7/30 (58) Fields investigated (Int.Cl. ⁷ , DB Name) H04B 7/24-7/26 102 H04Q 7/00-7/38

Claims (3)

(57) [Claims] 1. A wireless system comprising: a main device accommodating a plurality of lines and a plurality of connecting devices for realizing a predetermined communication function; and a plurality of terminals for establishing a wireless communication path between the plurality of connecting devices. In the exchange system, means for storing a unique system identification code unique to the wireless exchange system, means for transmitting the stored system identification code to the plurality of connection devices, and the transmitted system identification code Means for performing spread spectrum processing and evenly transmitting to the plurality of terminals, wherein the system identification code is any one of the plurality of connection devices.
Stored in one of the connecting devices , and the main device reads from the connecting device.
The system identification code is other than the one of the connection devices.
And the plurality of terminals establish the communication path with the identified connection device based on the system identification code subjected to the spread spectrum processing. 2. The data related to the communication is subjected to spread spectrum processing, and the connection device is identified by a frequency hopping pattern related to the spread spectrum processing. Wireless switching system. 3. The spread spectrum processing is applied to the data related to the communication, and the connection device is identified based on a spread code related to the spread spectrum processing. Wireless switching system.