JPH09182153A - Radio exchange system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for waiting at a frequency being used by another terminal and prevent processing after it from being confused by providing a means determining a frequency which first waits control information sent from a main equipment by hopping. SOLUTION: A radio terminal 103 manually inputs ID of the radio terminal 103 and stores the 10. In order to receive a PCF frame from the main equipment, the radio terminal 103 shifts to a reception state by a frequency band determined by ID. At the time of being capable of receiving the PCF frame, the radio terminal 103 recognizes and stores system ID from an ID part in the PCF frame and obtains dead channel information from an LCCH part. The radio terminal 103 checks dead channel information and when it exists, obtains a hopping frequency in a next unit time from an NFR part in the PCF frame, moves a receiving frequency to the frequency and waits a next PCF frequency. The radio terminal 103 repeats this operation to recognize the hopping pattern of the frequency and stores it.

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 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 has been used in various fields. A telephone exchange device (including a key telephone device) is no exception, and a system for wirelessly communicating between a main device having an exchange function and a wireless telephone has been put to practical use.

Hereinafter, a conventional wireless telephone exchange will be described. (System Configuration) In a conventional wireless switching system, generally, a wireless transmission system for a low power analog cordless telephone is used for wireless communication between an extension and a main device. That is, the modulation system is FM modulation, and two control channels and 87 voice communication channels can be used. Only point-to-point communication is possible. In order for the extension wireless terminal to communicate with the main unit, a connection device for the extension wireless terminal is required.

In starting communication, the control channel is first used to determine the voice communication channel to be used. Then, after determining the communication channel to be used, the process shifts to that channel, and thereafter, the communication is continued using the channel.

The configuration and basic operation of each part of the conventional wireless switching system will be described below. (Structure of Main Device) FIG. 28 is a block diagram showing structures of a conventional system and a main device.

[0006] Main apparatus 9001 is a main part of the present switching system, accommodates a plurality of external lines and a plurality of terminals, and exchanges calls between them. The connection device 9002 is
In order to be able to accommodate wireless terminals (wireless telephones to be described later) that are wirelessly connected one-to-one to the system, the wireless terminals are controlled wirelessly under the control of the main unit, and the wireless transmission path is established It is a device that performs.

The wireless telephone 9003 is a terminal for making a call with an external line accommodated in the main device 9001 via the connection device 9002 and for making an extension call.
The PSTN line 9005 is an external line from a PSTN (existing public network) 9004 which is one of the external networks accommodated in the main device 9001, and the SLT (single telephone) 9006 is one of the terminals accommodated in the main device 9001. is there.

Hereinafter, the internal configuration of main device 9001 will be described. The CPU 9101 is the center of the main device 9001 and controls the entire main device including exchange control. The ROM 9102 stores a control program of the CPU 9101. RAM 9103 is a CPU
It stores various data for the control of 9101 and provides a work area for various calculations.

[0009] The call path section 9104 is responsible for call exchange (time division exchange) under the control of the CPU 9101. P
The STN line i / f 9105 detects an incoming call for accommodating the PSTN line 9005 under the control of the CPU 9101.
This interface performs PSTN line control such as selection signal transmission and DC loop connection. SLTi / f9106 is C
Under the control of the PU 9101, it is an interface that performs power supply for allowing the SLT 9006 to be accommodated, loop detection, selection signal reception, call signal transmission, and the like.

A telephone unit 9107 has a handset, a dial key, a call circuit, a display, and the like. Under power control of the CPU 9101, the telephone unit 9107 functions as a dedicated telephone having a display and the like. The SLT 9006 performs only a call. The tone transmission circuit 9108
Various tones such as a PB signal, a dial tone, and a ring tone are transmitted. The connection device i / f 9109 is an interface that transmits and receives a call signal and a control signal to and from the connection device 9002 to accommodate the connection device 9002 under the control of the CPU 9101. (Configuration of Connection Device) FIG. 29 is a block diagram showing the configuration of the connection device 9002 in the conventional system.

[0011] The CPU 9201 is the center of the connection device 9002, and controls the entire connection device 9002 including the communication channel control and the radio unit control. ROM 920
Reference numeral 2 stores a control program of the CPU 9201, and the EEPROM 9203 stores a call code (system ID) of the switching system. RA
The M9204 stores various data for controlling the CPU 9201 and provides a work area for various calculations.

The main unit i / f 9205 is a CPU 9201.
Under the control of the main unit 9001, the connection device i / f 9109
And a call signal and a control signal.

The PCM-CODEC 9206 is a CPU 9
Under control of 201, PCM from main unit i / f9205
The coded call signal is converted into an analog voice signal and transmitted to a voice processing LSI 9207 described later, and the analog voice signal from the voice processing LSI 9207 is converted into a PCM code and transmitted to the main device i / f 9205. .

The audio processing LSI 9207 includes a CPU 920
Under the control of 1, when a demodulated signal from a wireless unit 9208 described below is received, and the received signal is control data, A / D conversion is performed and output to the CPU 9201, and the received signal is an audio signal. PCM-COD
It outputs to the EC 9206 and D / A converts the control data transmitted from the CPU 9201 to the radio section 9208.
And performs processing such as compression of the audio signal from the PCM-CODEC 9206, and transmits the result to the wireless unit 9208.

Under the control of the CPU 9201, the radio section 9208 modulates the control data and the audio signal from the above-described audio processing LSI 9207 so that they can be transmitted by radio and transmits them to the radio telephone 9003. A signal from a wireless telephone received from the telephone 9003 is demodulated to extract control data and an audio signal, which are transmitted to an audio processing LSI 9207. (Configuration of Radio Dedicated Telephone) FIG. 30 is a block diagram showing the configuration of a radio dedicated telephone 9003 in the conventional system.

The CPU 9301 is a wireless telephone 900.
The central processing unit 3 is a CPU that controls the entire wireless telephone 9003 including the wireless unit control and the call control. ROM
Reference numeral 9302 stores a control program of the CPU 9301. EEPROM 9303 stores a call code (system ID) of the present exchange system and a sub-ID of the wireless telephone.

The RAM 9304 has a CPU 9301
And a work area for various calculations. Call circuit 93
Reference numeral 05 denotes a circuit that inputs and outputs a call signal from a handset 9308, a microphone 9309, and a speaker 9310, which will be described later, under the control of the CPU 9301.

The audio processing LSI 9306 includes a CPU 930
Under the control of No. 1, a demodulated signal from the radio unit 9307 is received, and if the received signal is control data, A / D conversion is performed and output to the CPU 9301. If the received signal is a voice signal, decompression is performed. And the like, and outputs the result to the call circuit 9305, D / A converts the control data transmitted from the CPU 9301, transmits the control data to the wireless unit 9307, and performs processing such as compression of the audio signal from the call circuit 9305. This is transmitted to the wireless unit 9307.

Under the control of the CPU 9301, the radio section 9307 modulates the control data and the audio signal from the above-described audio processing LSI 9306, processes the control data and the audio signal so that they can be transmitted wirelessly, transmits the modulated signal to the wireless connection device 9002, and An audio processing LSI demodulates a signal wirelessly received from the connection device 9002 to extract a signal with control data and voice.
9306.

A handset 9308 inputs and outputs a voice signal for talking, and a microphone 9309 collects and inputs a voice signal. Also, the speaker 931
0 is for outputting a voice signal in a loud voice, and the display unit 93
Reference numeral 11 denotes a dial number input from the key matrix 9312, the use status of an outside line, and the like. Further, the key matrix 9312 includes dial keys for inputting dial numbers and the like, and function keys such as an outside line key, a hold key, and a speaker key. (Description of Operation of Conventional System) Next, the basic operation of the conventional wireless switching system will be described. FIG. 31 is an explanatory diagram showing a conventional operation sequence.

First, when there is a call request in the wireless telephone, the wireless telephone 9003 transmits a connection notification signal (9401) to the connection device 9002 on a predetermined wireless control channel. This connection notification signal (940
The connection device receiving 1) checks the use status of the wireless communication channel, and if there is an available communication channel, sends a connection response signal (9402) to the wireless telephone 90.
Send to 03.

Upon receiving the connection response signal (9402), the wireless telephone 9003 switches the frequency used from the wireless control channel to the wireless communication channel and transmits the channel movement notification signal (9403) to the connection device. Thereafter, transmission and reception of signals are performed on the communication channel.

Upon receiving the signal, the connection device 9002
After confirming the shift to the call channel, a channel shift response signal (9404) is transmitted to the wireless telephone. Subsequently, the connection adapter 9002 transmits a line connection notification (9405) to the main device 9001. Wireless telephone 9003
Receives the channel movement response signal (9405),
When the establishment of the wireless line is confirmed, an outside line transmission signal (940
6) is transmitted to the connection device. Outside line outgoing signal (9406)
The connection device, which has received the
07) is transmitted. After that, the main device makes an outgoing call to the outside line, and when the other party answers, the call shifts to the call (941).
2).

With the above procedure, the wireless telephone can make a call through the public line. Also, for incoming calls, a call can be started by acquiring a wireless communication channel in the same procedure.

[0025]

By the way, in the radio hopping system of the frequency hopping system, the control information is sent while hopping even if the main device and each terminal are provided with means for sending and receiving the control information. However, even if the terminal receives control information, there is no means to decide which frequency to wait at first, and if it is selected appropriately, it will wait at the frequency used by another terminal, and the subsequent processing is confused. There was a risk of causing.

The first object of the present invention (the object of claim 1)
Gives independent information for each terminal, and based on that information,
It is to decide the frequency to be listened to first and avoid listening on the same frequency as other terminals.

A second object of the present invention (the object of claim 2) is to use a terminal ID as independent information for each terminal,
It is to improve convenience by making it easy to input and diverting information that has already been used as an extension number or the like.

[0028]

Means for Solving the Problems The first invention of the present application is:
A wireless switching system using a spread spectrum communication system of a frequency hopping system, which comprises a main device for exchange and one or more terminals, wherein the main device and each terminal are:
In addition to providing means for transmitting and receiving control information, each terminal is provided with means for determining a frequency at which control information sent from the main device while hopping is first awaited.
The means for determining the frequency is characterized in that it is determined based on information given independently to each terminal.

The second invention of the present application is characterized in that the information independently given to each terminal is an ID given to each terminal.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In recent years, spread-spectrum communication has attracted particular attention among digital wireless communication systems. Spread spectrum communication is known as having high interference removal capability and excellent confidentiality by spreading information to be transmitted over a wide band. In countries around the world,
A frequency in the 4 GHz band is allocated for spread spectrum communication, and is spreading worldwide.

The spread spectrum communication system is roughly classified into frequency hopping (FH system) and direct spread (DS system). The former is to perform transmission using a wide band by changing the modulation frequency within a fixed time, and the latter is to spread-modulate the information to be transmitted with a pseudo-noise code at a speed that is ten to several hundred times that speed. It uses a wider band.

Therefore, in the embodiment of the present invention, in the wireless switching system using the frequency hopping system, a means for transmitting and receiving control information between the main device and the terminals is provided, and each terminal is provided with an independent information for each terminal. Is provided, and the frequency at which the terminal waits for the first control information from the main unit is determined based on that information.

Further, an ID assigned to each terminal is used as independent information for each terminal, and when waiting for information from the main unit, which frequency is used to wait is determined by the ID.

In the following, in this embodiment, the case where the digital radio communication by the frequency hopping method is used for the extension transmission of the switching system will be sequentially described in detail. (System Configuration) FIG. 1 is an explanatory diagram showing the configuration of a system assumed in this embodiment.

This system accommodates the public line 102,
An exchange 101 having an exchange function and a wireless connection function;
A plurality of wireless telephones 103-A and 103 for communicating control data and voice data with the exchange 101.
-B and a data terminal device 104-A which performs control data communication between the exchange and direct data communication between terminals.
˜104-F.

The definition of the data terminal device in the present embodiment is that "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. Combined with adapter "
And the data terminal is a computer 104-A.
Not only printer 104-B, copier 104-C, video conference terminal 104-D, facsimile 104-E, L
The AN bridge 104-F and various terminals such as electronic cameras, video cameras, and scanners that perform data processing are applicable.

These wireless dedicated telephones and data terminals are
A major feature of the present system is that communication between each terminal can be freely performed, and at the same time, a public network can be accessed.

The detailed structure and operation will be described below. (Configuration of Main Device) First, the configuration of a main device that accommodates a public line will be described.

FIG. 2 is a block diagram showing the configuration of the system and the main unit of this embodiment.

The main unit 1 is the main part of the present switching system, accommodates a plurality of outside lines and a plurality of terminals, and exchanges calls between them. The connection device 2 performs control of the wireless terminal wirelessly under the control of the main device 1 so that a wireless terminal (a wireless dedicated telephone, a data terminal to which a wireless adapter is connected) can be accommodated in the system. The transmission path is established.

The wireless-only telephone 3 is a telephone for making a call with an external line accommodated in the main device via the connection device 2 and for making an extension call with each other. The wireless adapter 4 includes a data terminal 5 such as a computer and a printer, and SL.
By connecting to a T (single telephone) 10, a facsimile 11 and an ISDN terminal 12, wireless data transmission is possible between similarly configured data terminals.

The PSTN (existing public network) 6 is one of the outside networks accommodated in the main unit 1, and the PSTN line 7 is the PS.
It is an outside line from TN6. ISDN (Digital Communication Network)
Reference numeral 8 denotes one of the external networks accommodated in the main
N line 9 is an outside line from ISDN 8. The SLT (single telephone) 10 is one of the terminals housed in the main device 1.

The internal structure of the main unit 1 will be described below. First, the CPU 201 is the center of the main device 1 and controls the entire main device including exchange control. The CPU 201 allocates a channel and manages an empty channel in response to a channel allocation request from a terminal coming from the connection device i / f 210, and the information is stored in a RAM.
It is temporarily stored in 203.

The ROM 202 stores the control program of the CPU 201, and the RAM 203 stores the CP.
It stores various data for controlling U201 and provides a work area for various calculations.

The call path unit 204 controls the exchange of calls (time division exchange) under the control of the CPU 201.
Under the control of the CPU 201, the N-line i / f 205
This interface performs PSTN line control such as incoming call detection, selection signal transmission, and DC loop connection for accommodating a TN line. The ISDN line i / f 206 is a CPU 201
This interface supports ISDN layers 1 and 2 for accommodating an ISDN line under the control of, and performs ISDN line control.

The telephone section 207 has a handset, a dial key, a call circuit, a display, etc. When energized, it functions as a dedicated telephone having a display, etc. under the control of the CPU 201, and during a power failure. , SLT is used only for telephone calls. The wireless dedicated telephone unit 208 has a handset, a dial key, a call circuit, a display, and the like, and functions as an extension wireless dedicated telephone under the control of the CPU 201 when energized and as an SLT when a power failure occurs. .

The tone sending circuit 209 sends out various tones such as a PB signal, a dial tone and a ring tone. The connection device i / f 210 is an interface that transmits and receives a call signal and a control signal to and from the connection device 2 to accommodate the connection device 2 under the control of the CPU 201. (Configuration of Connection Device) FIG. 3 is a block diagram showing the configuration of the connection device 2.

The CPU 301 is the center of the connection device 2 and controls the whole connection device 2 including the control of the communication channel and the radio section. The ROM 302 is the CPU 3
01 is stored, and EEP
The ROM 303 stores a call code (system ID) of the switching system. RAM 304 is a CPU
While storing various data for control of 301,
It provides a work area for various calculations.

The main unit i / f 305 is an interface for transmitting / receiving a call signal and a control signal to / from the connection unit i / f of the main unit 1 under the control of the CPU 301. Under the control of the CPU 301, the ADPCM conversion unit 306 receives the P from the main device 1.
Converts a CM-coded speech signal into an ADPCM code,
While transmitting to the channel codec 307 described later,
The ADPCM coded speech signal from the channel codec 307 is converted into a PCM code and transmitted to the main unit 1.

The channel codec 307 is the CPU 30.
Under the control of 1, the ADPCM-coded speech signal and the control signal are subjected to processing such as scrambling, and are also time-division multiplexed into a predetermined frame. Radio unit 3
08, under the control of the CPU 301, modulates the framed digital signal from the channel codec 307 so that it can be transmitted wirelessly, transmits it to the antenna, and demodulates the signal received wirelessly from the antenna. The digital signal is processed into a framed digital signal. FIG. 4 is a block diagram showing the configuration of the wireless telephone 3.

The CPU 401 is the center of the wireless-only telephone 3, and includes the wireless-only telephone 3 including the radio section control and call control.
The ROM 402 controls the entire system.
The control program 401 is stored.

The EEPROM 403 is a calling code (system ID) of this exchange system, and a sub ID of the wireless telephone.
Is stored in the RAM 404.
In addition to storing various data for the control of the above, a work area is provided for various calculations.

Under the control of the CPU 401, the call circuit 405 inputs / outputs a call signal from a handset 410, a microphone 411, and a speaker 412, which will be described later.

The ADPCM codec 406 is the CPU 4
Under the control of C.01, the analog voice signal from the communication circuit 405 is converted into an ADPCM code, and transmitted to a channel codec 407 described later.
7 converts the ADPCM-encoded call signal into an analog voice signal and transmits it to the call circuit.

The channel codec 407 is the CPU 40.
Under the control of No. 1, processing such as scrambling is performed on the communication signal and the control signal that have been ADPCM-coded, and time-division multiplexing is performed on a predetermined frame.

Under the control of the CPU 401, the radio section 408 modulates the framed digital signal from the channel codec 407, processes it so that it can be transmitted by radio, and transmits it to an antenna which will be described later. The received signal is demodulated and processed into a framed digital signal.

The handset 410 is for inputting / outputting a voice signal for talking, and the microphone 411 is for collecting and inputting a voice signal. The speaker 412 outputs a voice signal in a loud voice, and the display unit 413 displays a dial number input from a key matrix to be described later and an external line usage status.

The key matrix 414 is composed of dial keys for inputting dial numbers and the like, and function keys such as an outside line key, a hold key, and a speaker key. (Configuration of Wireless Adapter) FIG. 5 is a block diagram showing the configuration of a wireless adapter 502 connected to a data terminal 501 that can be accommodated in the system.

In the figure, the data terminal 501 indicates, for example, a personal computer, a workstation, a printer, a facsimile, and other data terminal equipment connected to the wireless adapter 502 via a communication cable or an internal bus.

The wireless unit 503 of the wireless adapter 502 exchanges wireless signals with the wireless unit of the connection device or another wireless adapter.

The main control section 504 is a CP which is the center of control.
U, a peripheral device for performing interrupt control, DMA control, and the like, an oscillator for a system clock, and the like, and controls each block in the wireless adapter.

The memory 505 is composed of a ROM for storing a program 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 standard equipment of a data terminal device such as the data terminal 501 described above, for example, RS232C, Centronics, LA.
Communication i / f such as N, internal bus of personal computer or workstation, for example, ISA bus, PCM
CIAi / f and the like correspond.

The terminal control unit 507 controls various kinds of communication required for data communication between the data terminal 501 and the wireless adapter 502 via the communication i / f 506.

The channel codec 508 performs frame processing and radio control, and its configuration is shown in FIG. 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.

The error correction processing unit 509 is used to reduce bit errors occurring in data by wireless communication. At the time of transmission, an error correction code is inserted in the communication data. Further, at the time of reception, an error position and an error pattern are calculated by arithmetic processing, and a bit error in the received data is corrected.

The timer 510 provides a timing signal used by each block inside the wireless adapter.

FIG. 6 is a block diagram showing the structure of a modem built-in type wireless adapter which is required when performing data transmission to a public line.

This wireless adapter 502 is provided with a modem 511 and an ADPCM codec 512 instead of the error correction processing unit 509 in the configuration of FIG.

The modem 511 modulates data into a voice band signal, and the ADPCM codec 5
Reference numeral 12 is for encoding the signal modulated by the modem 511. As a result, the ADPCM encoded data is assembled into a frame by the channel codec 508 and transmitted to the main device via the wireless unit 503. (Structure of Radio Unit) FIG. 7 is a block diagram showing a radio unit having a common configuration for the main unit, wireless dedicated telephone and data terminal of the present system.

The transmitting / receiving antennas 601a and 601b are
The switch 602 is for efficiently transmitting and receiving a radio signal, and the changeover switch 602 is for changing over the antennas 601a and 601b. A band pass filter (hereinafter, referred to as a BPF) 603 is for removing signals in unnecessary bands, and a changeover switch 604 is for switching between transmission and reception.

The amplifier 605 is a receiving amplifier.
The amplifier 606 is a transmission-system power control amplifier. The converter 607 includes the 1st. It is a down converter for IF, and converter 608 is an up converter.

The changeover switch 609 is for switching between transmission and reception, and the BPF 610 is for removing an unnecessary band signal from the signal converted by the down converter 607. Converter 611 is
2nd. This is a down converter for the IF, and the two down converters 607 and 611 constitute a double-version receiving mode.

The BPF 612 is 2nd. For IF,
The 90-degree phase shifter 613 shifts the output phase of the BPF 612 by 90
It is a phase shift. Quadrature detector 614 is
The BPF 612 detects and demodulates a signal received by the 90-degree phase shifter 613. Further, the comparator 615 is for waveform shaping the output of the quadrature detector 614.

Further, a voltage controlled oscillator (hereinafter referred to as VCO) 616 and a low pass filter (hereinafter referred to as LPF)
617 and a PLL 618 including a programmable counter, a prescaler, a phase comparator, and the like.
And form a frequency synthesizer for the receiving system.

Further, a VCO 619 for generating a carrier signal
, An LPF 620, a PLL 62 including a programmable counter, a prescaler, a phase comparator, and the like.
1 and 1 constitute a frequency synthesizer for hopping.

Further, the VCO 6 of the transmission system having the modulation function
22, a LPF 623, a PLL including a programmable counter, a prescaler, a phase comparator, and the like.
624 constitutes a transmission frequency synthesizer having a frequency modulation function.

The reference clock oscillator 625 is a PLL of various types.
The baseband filter 626 supplies a reference clock for 618, 621, and 624, and the baseband filter 626 is a filter for band limitation of transmission data (baseband signal).

The operation of the above radio section will be described below. 1. At the time of transmission, data (digital data) input from an external circuit such as a processor is band-limited by a baseband filter 626, and then input to a modulation terminal of a transmission system VCO 622.

The transmission system VCO 622 is the transmission system PLL 62.
4 and a control voltage output from the LPF 623 circuit to determine the frequency, and generate an intermediate frequency (IF) modulated wave by direct modulation.

VCO 622, LPF 623, PLL 62
4 generated by the frequency synthesizer (I
The modulated wave of F) is input to the up-converter 608,
VCO619, LPF620, PLL62 for hopping
After being added to the carrier signal generated by the frequency synthesizer composed of 1, it is input to the transmission system amplifier 606.

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 emitted from the antenna 601 as a radio wave into space. 2. At reception The signal received by the antenna 601 is the BPF 603.
After removing unnecessary band signals, the signal is amplified to a predetermined level by a receiving amplifier 605.

The carrier signal of the received signal amplified to a predetermined level is removed by the down converter 607,
1st. Converted to IF frequency.

1st. The received signal of IF is BPF610
After the signal in the unnecessary band is removed by 2nd. The signal is input to the down converter 611 for IF.

The down converter 611 is connected to the VCO 61.
6, a signal generated by a frequency synthesizer composed of an LPF 617 and a receiving system PLL 618, and 1st. I
F. 2nd. A signal having an IF frequency is generated.

2nd. The reception signal down-converted to the IF frequency is input to a 90-degree phase shifter 613 and a quadrature detector 614 after an unnecessary band signal is removed by a BPF 612.

The quadrature detector 614 performs detection and demodulation using the signal whose phase has been shifted by the 90-degree phase shifter 613 and the original signal.

The data (analog data) demodulated by the quadrature detector 614 is waveform-shaped by the comparator 615 as digital data and output to an external circuit. (Wireless frame) FIGS. 8 (1) to 8 (7) are explanatory diagrams showing a wireless frame configuration used in the present system.

In this system, the "main device-radiophone communication frame" (hereinafter referred to as PCF),
Three different frames, “communication frame between wireless telephones” (hereinafter, referred to as PPF) and “burst data frame” (hereinafter, referred to as BDF) are used. Hereinafter, the details of the internal data of each frame will be described.

FIG. 8A shows the PCF. Here, FSYN is a synchronization signal. In addition, LCCH-T
Is a logical control channel sent from the main unit to the radiotelephone, and LCCH-R is a logical control channel sent from the radiotelephone to the main unit. Also, T1 and T
Reference numerals 2, T3 and T4 are voice channels sent to four different wireless dedicated telephones, and R1, R2, R3 and R4 are voice channels transmitted from four different wireless dedicated telephones. GT represents a guard time.

Further, in FIG. 8 (1), F1, F
“3” indicates a frequency channel used when wirelessly transmitting this frame, and indicates that the frequency channel is changed for each frame.

FIG. 8B shows the PPF. Here, FSYN is a synchronization signal. In addition, LCCH-T
Is a logical control channel sent from the main unit to the radiotelephone, and LCCH-R is a logical control channel sent from the radiotelephone to the main unit. Also, T1 and T
2 and T3 are voice channels transmitted to three different wireless telephones, and R1, R2 and R3 are voice channels transmitted from three different wireless telephones. GT indicates a guard time, and RV indicates a reserved bit.

Further, in FIG. 8 (2), F1, F
3, F5 and F7 are frequency channels used for wirelessly transmitting this frame. Unlike the PCF, after receiving the logical control information LCCH-T from the main unit in F1, the frequency channel is changed to Switch to F5 secured for wireless dedicated telephone communication to perform wireless dedicated telephone communication. Thereafter, the procedure of switching the frequency channel to F3, receiving the logical control information from the main device, and switching the frequency channel to F7 secured for the communication between the wireless telephones is repeated until the communication between the wireless telephones ends.

FIG. 8C shows the BDF. Here, FSYN is a synchronization signal. In addition, LCCH-T
Is a logical control channel sent from the main unit to the radiotelephone, and LCCH-R is a logical control channel sent from the radiotelephone to the main unit. R is a carrier sense time for confirming that the previous frame has been completed or for confirming whether or not another wireless device is emitting radio waves. Also, PR1 is the preamble and D
ATA is a data slot for storing burst data,
GT represents a guard time.

Further, in FIG. 8 (3), F1, F
3, F5 and F7 are frequency channels used for wirelessly transmitting this frame. Unlike the PCF, after receiving logical control information from the main unit in F1,
F5 secured frequency channel for burst data communication
To perform wireless inter-telephone communication. Thereafter, the procedure of switching the frequency channel to F3, receiving the logical control information from the main device, and switching the frequency channel to F7 secured for burst data communication is repeated until the burst data communication ends.

FIG. 8 (4) shows an FSYN frame. Here, the PR is a 62-bit preamble for frequency synchronization acquisition defined by the Radio Wave System Development Center (hereinafter referred to as RCR). Also, SYN
Is a 31-bit frame synchronization signal defined by RCR, and ID is a 63-bit calling signal defined by RCR. FI is a 2-bit channel type signal for distinguishing PCF, PPF, and BDF. Further, TS indicates time slot information, and NFR indicates frequency information of the next frame. The numbers in the figure indicate the number of bits in this embodiment.

FIG. 8 (5) shows a frame of the voice channel. Here, T1, T2, T3, T4, R1, and R
Since R2, R3, and R4 have the same configuration, in the following, transmission audio channels are collectively indicated as Tn, and reception audio channels are collectively indicated as Rn. Also, Tn and Rn
Are common.

In FIG. 8 (5), R is the time of carrier sense for confirming that the previous frame has ended or for confirming whether another radio apparatus is not emitting a radio wave. PR1 is a preamble for each slot, and UW is a unique word including a sub ID. D is 3.2 kbps D channel information, and B is 32 kbps B channel information. Further, GT represents a guard time. The numbers in the figure are
This shows the number of bits in the present embodiment.

FIG. 8 (6) shows a logical control channel LCCH-
The frame structure of T is shown. Where LCCH-T
Is a logical control channel sent from the main unit to the wireless telephone. UW represents a unique word including a sub ID, LCCH represents logical control information, and GT represents a guard time. Note that the LCCH-T is continuously transmitted after the FSYN is transmitted, and thus no preamble or the like is added.

FIG. 8 (7) shows a logical control channel LCCH-.
The R frame configuration is shown. Here, LCCH-R
Is a logical control channel sent from the wireless telephone to the main unit. R is a carrier sense time for confirming that the previous frame has ended or for confirming whether or not another wireless device is emitting radio waves. PR1 is a preamble for each slot, UW
Indicates a unique word including a sub ID, LCCH indicates logical control information, and GT indicates guard time. (Channel codec) The frame is processed by the channel codec. FIG. 10 is a block diagram showing the configuration of the channel codec.

In the figure, reference numeral 801 is a channel codec, which is composed of an ASIC. Further, 802 is a wireless unit, 803 is an ADP built in a wireless telephone, etc.
A CM codec 804 is a CPU of a wireless telephone or a wireless adapter.

Further, inside the channel codec 801, the radio control section 805 controls the radio section to control transmission / reception switching and frequency hopping. Further, it has a function of performing carrier detection prior to data transmission. ADPCM codec i / f806 is ADPCM
An interface for exchanging serial data and a synchronous clock for exchanging audio signals with the codec 803.

The CPU i / f 807 is an interface for exchanging control information with the CPU 804, and has a built-in register for storing the state and operation mode of each unit in the ASIC. Then, control of each part of the ASIC is performed according to a control signal from the CPU 804 or the state of each part in the ASIC.

The transmission frame processing unit 808 uses the ADPCM
A signal from the codec and logical control data input from the CPU 804 are assembled into the transmission frame shown in FIG. The reception frame processing unit 809 extracts control information and audio data from the frame of the signal from the radio unit, and
It is passed to the CM codec i / f806 and the CPU i / f807. The synchronization processing unit 810 is composed of a DPLL, reproduces a clock from a received signal, and captures bit synchronization.

The basic operation of this ASIC will be described below. 1. CPU 804 sends control information to be added to the transmission data frame.
From the CPU i / f 807. When the ASIC is used in the wireless-only 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 806. 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 the frame, the data is scrambled. This is necessary to maintain DC balance during wireless transmission. The radio control unit 805 takes the timing at which the reception signal ends and, after carrier sensing, performs radio unit 8
02 is transmitted, and the transmission frame is passed to the wireless unit 802. 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. Then, upon receiving the received frame, after descrambling the data, control information and data are extracted from the received frame. The control information is passed to the CPU 804 via the CPU i / f 807.

If the received frame is PCF or PPF
, The received data is ADPCM codec i
/ F806, and if it is a wireless phone, ADPCM
The data is output as voice through the codec 803, and is sent to the communication channel if the main device is used.

When the received frame is the BDF, the received data is transferred to the memory in the data terminal. 3. Handling of Logical Control Data (3-1) At the time of non-communication The mobile station stands by at a frequency previously assigned by the main apparatus and receives the LCCH-T transmitted from the main apparatus at regular intervals. At this time, the LCCH sent from the main device includes information such as whether or not there is an external line incoming call and whether or not there is a call request at the wireless telephone side. The wireless telephone transmits the LCCH extracted by the reception frame processing unit to the CPU. After that, the LCC sent to the main unit specified by the CPU
H is sent to the main unit on the LCCH-R in the same frame. In this way, the wireless telephone repeats this procedure until an outgoing or incoming call occurs. (3-2) At the time of communication The 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 non-communication frequency channel F1. The wireless telephone A monitors the LCCH from the main unit on the frequency channel F1 in the procedure described in (3-1) until a call is generated. Then, when a call is made in the wireless telephone A, the LCCH-R sent to the main unit in the procedure of (3-1)
And sends it to the main unit. The LCCH that informs whether communication is possible from the main apparatus is determined by the LCCH transmitted on the frequency channel F1 after 100 ms.

If the content of the LCCH from the main unit after the call request indicates that the line is full and connection cannot be made,
The wireless telephone A notifies the user that the telephone is busy.

If the contents of the LCCH from the main unit after the call request is shown to be connectable, the same LCCH-
In T, a time slot of a voice channel used for a call is specified. For example, if "1" is designated, it indicates that communication is performed using T1 and R1.

Communication is performed while switching the frequency channel according to the frequency hopping pattern designated by TS and NFR in the FSYN frame. The exchange of control information after connection with the main unit is performed based on the D channel information in the Tn and Rn frames.

In the case of the communication between wireless dedicated telephones, the control information between the wireless dedicated telephones is performed by the D channel information, and after the communication is completed, the respective radio dedicated telephones use the LCCH-R of the designated frequency channel, that is, in the case of the previous example. When the wireless-only telephone A exchanges control information with the main apparatus on the frequency channel F1 during non-communication, the wireless-only telephone notifies the main apparatus that the communication between wireless-only telephones has ended. (Regarding Frequency Hopping Pattern) FIG. 11 is an explanatory diagram showing the concept of frequency hopping used in the system of this embodiment.

In the system of this embodiment, 1M using the 26 MHz band which is approved for use in Japan.
26 frequency channels wide in Hz are used. Considering the case where there are frequencies 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, one frame has a length of 5 ms, and the frequency channel is hopped for each frame. Therefore, the length of one cycle of one hopping pattern is 100 ms.

In the figure, different hopping patterns are shown as different patterns. As described above, by using a pattern in which the same frequency is not used at the same time in each frame, it is possible to prevent a data error or the like from occurring.

Further, in the case of accommodating a plurality of connecting devices, it is also a feature of this system that different connecting devices use different hopping patterns in order to prevent interference between the connecting devices. With this method, a system having a multi-cell configuration can be realized and a wide service area can be obtained. (Detailed Description of Operation) As described above, in this system, a frame is assembled for communication between the main unit and a wireless telephone or data terminal, or between terminals, and the frequency to be used is switched at regular intervals. Control.

The specific operation of this system will be described below in some cases. 1. Basic operation procedure In this system, before using the call channel,
It is characterized in that slots to be used and hopping patterns are determined using logical control channels (LCCH-T and LCCH-R) that are time-division multiplexed in a frame. Furthermore, in order for each terminal to perform intermittent reception and enable battery saving, each terminal is designed to transmit and receive only on a logical control channel that transmits at a pre-assigned frequency.

However, 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. When the first frame is received, the frequency information of the next frame contained therein is fetched, and the frequency hopping is started. When a plurality of connecting devices are used, the hopping pattern used by the connecting device that can 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 registration of the ID of each terminal and the assignment of the logical control channel frequency are performed in the setting mode.

When the logical control channel is allocated,
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 occurs, the LCCH-
Using R, the data is transmitted to the main unit.

When it is desired to start the communication using the call slot, it is necessary to notify the main device of that fact using the logical control channel and receive the allocation of the slot and the hopping pattern. After those assignments have been made,
Calls and data transmission can be performed.

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

FIG. 15 is an explanatory diagram showing an operation sequence when the power of the main device (connecting device) and the wireless terminal in this embodiment is turned on. 16 is a flowchart showing the operation when the main device (connection device) is powered on in this embodiment, and FIG. 17 is a flowchart showing the operation when the wireless terminal is powered on in this embodiment. (1) Description of operation of main device (connecting device) when power is turned on First, when the power switch of the main device 1 (connecting device 2) main body is turned on, the main device 1 (connecting device 2) causes S22 in FIG.
After initializing the main body with 01, the hopping pattern of frequency hopping to be used in wireless communication is determined in S2202, and then the hopping pattern (frequency hopping in the next unit time) and the ID of this system are determined in S2203. The added PCF frame is transmitted to the wireless terminal 103. At this time, I in the PCF frame
The D section (FIG. 8 (4)) contains the system ID, the NFR section (FIG. 8 (4)) contains information on the frequency hopping in the next unit time in the hopping pattern, and LC
The CH section ((6) in FIG. 8) includes information on available control channels that can be used on the wireless terminal side.

The format of the LCCH part showing the information of the idle control channel is shown in FIG. 9 (1). Here, the vacant information is a code 8 bits (here, "0A") indicating that the vacant information is vacant information from the beginning of the LCCH part, and following the code,
The vacant information is shown in bit units, and in this embodiment, information for 20 channels is included ('0' is vacant, '1' is in use).

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), S
In 2205, the ID of the wireless terminal 103 is stored, a control channel for transmitting wireless communication control information addressed to the wireless terminal 103 is determined, and this is determined in S2206.
(2103 in FIG. 15). Then, when notified, the content of the RAM 203 storing the empty channel information is rewritten, the channel assigned to the wireless terminal 103 is set in use, and the empty information is transmitted. When all information is assigned, all 20 bits are set to "1" and transmitted.

Further, the method of notifying empty channel information is made independent for each frequency, and in F1, the empty information of the F1 channel is changed to F
20 may be notified of the empty information of F20 by each LCCH unit. (2) Description of Operation When Powering On the 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 sets S23 in FIG.
01 initializes the main body. Subsequently, in S2302, the ID of the wireless terminal 103 is manually input, and S
At 2303, it is checked whether the ID is correctly input (for example, a large value that does not correspond to the frequency band such as 28 is input), and input again until the correct ID is input. When the correct ID is input, the wireless terminal 103 stores this ID (S2304). In addition,
Unlike the system ID, this ID is like an extension number of the terminal.

Next, in S2305, the PCF frame from the main unit 1 (connecting unit 2) is received, so that the reception state is entered in the frequency band determined by the ID. For example, when 3 is input as the ID, the reception state is set in the frequency band of F3. Here, waiting for the reception of the PCF frame is a time of about two hopping cycles, and if the PCF frame cannot be received even during the waiting period, the processing without an empty channel described later is performed. Good (S2320, S2321).

If the PCF frame from the main device 1 (connecting device 2) can be received in S2306, the system ID is recognized and stored from the ID portion (FIG. 8 (4)) in the PCF frame in S2307, and the LCCH Part (Fig. 8
From (6)), vacant channel information (frequency at which a PCF frame is transmitted from the wireless terminal to the main device) is obtained.

In S2308, the empty channel information is checked, and if there is an empty channel, the frequency for hopping in the next unit time is acquired from the NFR part in the PCF frame, and the wireless terminal 103 moves the received frequency to that frequency, Wait for the next PCF frame.

The wireless terminal 103 repeats this operation,
The frequency hopping pattern is recognized and stored (S2309).

If there is no empty channel in S2308, the user is notified to that effect (S2312), and after a certain period of time, the power is turned off (S2313).

If there is no empty channel here, it is considered that the terminal has already been set up with the same ID, so the ID to be set is checked. here,
As a method of notifying the user, in the wireless-only telephone shown in FIG. 4, there are a method of notifying with a sound from the speaker 412, a method of displaying on the display unit 414, and a method of using both of them.

In the case of the wireless adapters shown in FIGS. 5 and 6, the data terminal 501 is notified via the communication interface unit 506, and the data terminal software displays and sounds, or the adapter itself is provided with an LED or the like. It may be displayed as

When the hopping pattern and the system ID are known, the wireless terminal 103 determines the system ID in the idle control channel obtained by the LCCH section.
Also, a frame (2102 in FIG. 15) to which the ID information of the wireless terminal 103 itself is added is transmitted to the main device (S23).
10).

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 (S2311).
Then, the setting mode shifts to the normal mode. 3. Processing at the time of making an outside line from the wireless telephone FIG. 18 is an explanatory diagram showing an outside line calling sequence of the present embodiment, and FIG. 19 is a flowchart showing an operation of the main device 1 at the time of making an outside line of the present embodiment. Also, FIG. 20 is a flowchart showing the operation of the wireless-only telephone 3 at the time of making an outside line in this embodiment.

When the outside line key arranged in the key matrix 414 is depressed on the wireless telephone 3 (S25).
01), the wireless telephone 3 transmits and blinks the external line LED of the display unit 413 corresponding to the pressed external line button (S2).
502), an outside line transmission signal (2402) is transmitted to the main device 1 via the connection device 2 (S2503). This external line transmission signal is transmitted on the wireless link between the wireless telephone 3 and the connection device 2 by the LCCH- of the PCF frame shown in FIG. 8 (1).
R is transmitted, and in the connection device 2, the main device i / f 305 notifies the main device.

Main device 1 which receives an outside line transmission (2401)
Determines whether an outside line can be transmitted (S2601).
Here, if the outside line is free and transmission is possible, the outside line to be transmitted and which voice channel (T1 to T
4, R1 to R4). External line transmission permission (240
3) is transmitted to the wireless telephone 3 via the connection device 2 (S2602), and an outside line is captured (S2603). This outside line transmission permission is transmitted on the LCCH-T of the PCF frame.

Upon receiving the outside line transmission permission signal (2404) (S2504), the wireless telephone 3 synchronizes with the voice channel designated by the parameter sent by the permission signal. When the transition to the voice channel in the wireless telephone 3 is completed, a voice channel connection completion signal (2406) is transmitted by LCCH-R (S2505).

When the connection device 2 receives the outside line transmission permission from the main device 1, the connection device 2 receives a predetermined voice channel by the channel codec 307, creates a route to be passed to the main device 1, and outputs the voice from the wireless telephone 3. The main device 1 is notified of the channel connection completion (2405).

The main unit 1 completes the audio channel connection (24
05) (S2604), the wireless telephone 3
Assuming that the side is ready, the external line display green normal light instruction (2407) is transmitted to light the external line LED to green (S407).
2605). In addition, the communication path with the captured outside line is connected (S2606). The wireless telephone 3 receives the outside line display green ordinary light instruction signal (2408) (S2506), turns on the outside LED, turns on the communication line inside the wireless telephone 3, and sets the dial tone (2411). The user listens (S2507). In addition, in order to turn on the outside line LED of the wireless telephone 3 other than the wireless telephone 3 that has transmitted the outside line, the outside line display red normal light instruction (2409) is transmitted.

Then, the wireless telephone 3 which receives the dial from the key matrix 414 transmits it to the main unit 1 as a dial signal (2413) (S2508). The end of the dial is monitored by a timeout (S2509), and when the timeout is reached, the telephone is busy (S2510).

In the main unit 1, the dial (2412) 1
When the digit is received (S2607), the dialing is started to be transmitted to the outside line, and the transmission is monitored by timeout (S2608). When the dial transmission is completed, the telephone is busy (S2609).

Then, the call ends and the wireless telephone 3
Is on-hook (S2511), an on-hook signal (2416) is sent (S2512). The on-hook (2415) is transmitted to the main device 1 (S2610), and the voice channel disconnection (2417) is transmitted (S261).
1).

The main unit 1 cancels the allocation of the voice channel to the wireless telephone 3. Further, main device 1 transmits an outside line display turn-off instruction (2419, 2421) to turn off the outside line LED of wireless telephone 3 (S261).
2).

Upon receiving the voice channel disconnection signal (2418), the wireless telephone 3 opens the communication path (S251).
3) Then, the external line display turn-off instruction signal (242)
0, 2422), the external LED is turned off (S251).
4). 4. FIG. 21 is an explanatory diagram showing an external line incoming sequence of the present embodiment, and FIG. 22 is a flowchart showing an operation of the main device at the external line incoming of the present embodiment.

First, when an incoming call is received from the public line 102 in S2801, the process proceeds to S2802, and the main unit 1 makes the connection unit 2
270 to the wireless telephones 103-A and 103-B.
An external line incoming signal such as 3, 2705 is transmitted. When the off-hook signal 106 is received in S2803,
Proceeding to S2804, the mobile telephone 103-A that has transmitted the off-hook signal 2706 transmits an external line response permission signal 2709 carrying information such as the HP and voice channel number used for the external telephone call.

Next, when the voice signal connection completion signal 2710 is received in S2805, the processing proceeds to S2806, the call display signal 2713 is issued to the wireless telephone 103-A, and the processing proceeds to S2807 to perform the other wireless telephone 1
An outside line termination stop signal 2717 is transmitted to 03-B. Then, in S2808, the wireless telephone 103
-Connect data 2715 from A to public line 102,
Make a call.

Further, the main unit 1 continues the connection with the public line 102 until receiving the on-hook signal 2718 from the wireless telephone 103-A in S2809. And
Upon receiving the off-hook signal 2718, the process advances to step S2810 to stop the connection with the public line 102 and output the voice channel disconnection signal 2721. Further, in S2811, an outside line in-use display stop signal 2723 is transmitted to the other wireless telephone 103-B.

FIG. 23 is a flow chart showing the operation of the wireless telephone when receiving an outside line in this embodiment.

When the outside line incoming signal 2703 is received from the main unit 1 in S2901, the wireless telephone 103-
A, 103-B sounds a ring tone or the like, and detects whether or not an off-hook has been performed in S2902.

Then, for example, the wireless telephone 103-A
If an off-hook operation is performed in step S2903, the process advances to step S2903 to transmit an off-hook signal 2706 to the main device 1. Next, S2
If an external line response permission signal 2709 is received from the main apparatus 1 in 904, the process advances to step S2905 to connect a voice channel and transmit a voice channel connection completion signal 2710.

When the call display signal 113 is sent from the main unit 1 in S2906, the wireless telephone 103-A displays the call in progress on the display unit 413 and starts the call in S2907. Further, the communication is continued until the on-hook is performed in S2908. When the on-hook is performed, the process proceeds to S2909, and an on-hook signal 2718 is transmitted to main device 1.

When the audio channel disconnection signal 1281 is received in S2910, the audio channel is disconnected and the display unit 41
3. The call-in-progress display is turned off and the call is ended.

Further, before being off-hooked in S2908, the other wireless dedicated telephone 10 is connected in S2911.
Since 3-A has started a call, the wireless telephone 103-
When the external line termination cancellation signal 117 is received for B, the wireless telephone 103-B proceeds to S2912 and displays the display unit 41.
The outside line in use is displayed on 3.

Further, the wireless telephone 103-B is
The display unit 413 keeps displaying the outside line busy signal until the outside line busy display stop signal 2723 arrives at 2913. When the signal comes, the outside line busy display is turned off at S2914. 5. Processing of an extension call Next, it is managed by the same connection device (that is, the same connection device is used when communicating with the main device)
Assuming the case where two wireless telephones make a call between extensions, the operations of the calling wireless telephone and the called wireless telephone will be described.

FIG. 24 shows an extension communication main device, a connection device,
It is explanatory drawing which shows the sequence of the control data of the telephone set only for a calling side and the telephone set for a called side. Further, FIG. 25 is a flowchart showing an outline of processing in the main device.
6 is a flowchart showing an outline of processing in the calling-side dedicated telephone. Further, FIG. 27 is a flow chart showing an outline of processing in the called-side dedicated telephone. However, in each drawing, only the relevant processing part is described.

When the extension key arranged in the key matrix 414 is pressed on the wireless telephone 103-A (S3201), the wireless telephone 103-A connects the extension communication signal (3002) to the wireless telephone 103-A. The PCF shown in FIG. 8 (1) over the wireless link with the device 2.
The frame is transmitted using the LCCH-R (S320).
2). The connection device 2 transmits the extension communication signal (300
When 2) is received, the main device is notified.

Upon receiving the extension communication (3001), the CPU 201 in the main unit sends the transmitted wireless telephone 103-A.
Analysis of terminal attributes, etc., and if it is possible to make extension calls (S
3102), and transmits to the wireless telephone 103-A via the connection device 2 as extension communication permission using the LCF-T of the PCF frame (3003) (S3104).

Next, the wireless telephone 103-A which has received the dial information from the key matrix 414 is the main unit 1
The dial information (3008) is transmitted to (S320).
4). The last dial is monitored by timeout.

In the main unit 1, dial information (3007)
Is received (S3105), the dial is analyzed and transmitted to the wireless telephone 103-B via the connection device 2.
Extension incoming (3) using LCCH-T of PCF frame
009) is transmitted (S3106).

Upon receiving the extension incoming signal (3010), the wireless telephone 103-B uses the speaker to notify the operator of the incoming call, prompts the operator to respond (S3302), and waits for the user to respond with the key matrix 414. .

When the response from the user is detected, the wireless telephone 103-B sends an off-hook signal (3012) to the connecting device using the LCCH-R of the PCF frame and notifies the main device (S3304).

Upon receiving the off-hook (3012) from the wireless telephone 103-B, the main unit 1 receives (S3107),
An extension response (3013) is transmitted to the wireless telephone 103-A to notify that the wireless telephone 103-B has responded. The extension response (3013) includes the CP in the main unit.
U201 stores communication resources, such as empty time slots and hopping patterns, and voice channels (T1 to T4, R1 to R4) in PCF frames to be used, which are stored and managed in the RAM 203, with the wireless telephone 103-A and the wireless telephone The communication resource information is allocated to the direct communication of the telephone 103-B, and this communication resource information is transmitted to the wireless telephone 103-A via the connection device 2 as an extension response (3003) using the LCCH-T of the PCF frame (S3108).

Upon receiving the extension response signal, the wireless telephone 103-A transmits the voice channel connection completion signal (3006) using the LCCH-R (S3206).
The connection device 2 notifies the main device 1 of the voice channel connection completion command (3005) from the wireless dedicated telephone 103-A.

At the same time, the main unit 1 operates the wireless telephone 103.
-B also transmits an extension communication permission (3015) including communication resource information such as a hopping pattern and a voice channel number used for direct communication (S310).
8).

The wireless telephone 103-A, which has confirmed the other party's response by the extension response signal (3014), stops the ringback tone, switches to the assigned logical channel to communicate with the other party of communication, and switches the microphone and speaker. It controls and enters the call state with the other party.

On the other hand, the wireless telephone 103-B which has received the extension communication permission signal (3016) stops the ringing tone and synchronizes with the voice channel obtained from the communication resource information in the extension communication permission signal (3016). An audio signal connection completion signal (3018) is transmitted to the device 1.

That is, during 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. In particular,
In Tn and Rn of the PPF frame of FIG. 8 (2), as shown in FIG. 8 (5), control data is communicated in the D time slot and voice data is communicated in the B time slot.

Even when direct communication is performed between telephones, the frequency is switched to the frequency at which the PCF is transmitted at the timing of the beginning of the frame, LCCH-T is received, and LCC is received.
The ability to transmit HR is a major feature of this system. By doing so, it is possible to receive data from the main device even during communication via the extension, and it is possible to respond to services such as incoming calls during a call.

Now, the main unit 1 is the wireless telephone 103.
Upon receiving the audio signal connection completion (3017) from -B (S3109), it is determined that the radiotelephone 103-A and the radiotelephone 103-B have started a telephone call and waits for the end of extension communication (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 key matrix 414.

After the call is completed, 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 that has received the on-hook signal (3020)
An on-hook confirmation signal (3021) is transmitted as control information in the communication channel.

Upon receiving the on-hook confirmation signal (3021), the wireless telephone 103-A switches the communication channel to the logical control channel, and the extension communication end signal (302
3) is transmitted to the connection device 2. End of the extension communication (30
02) is transmitted to the main device 1 and the wireless dedicated telephone 103
-Send voice channel disconnect (3024) to A. Similarly, the main unit 1 also transmits a voice channel disconnection (3026) to the wireless telephone 103-B (S26).
3111).

Next, the main unit 1 uses the wireless dedicated telephones A and B.
The communication resource such as the voice channel allocated to the communication is released (S3112). Audio channel disconnect signal (3
025, 3027) to receive the wireless dedicated telephone 103-
A and 103-B release resources.

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

The basic part of this procedure is also used in the data transmission from the computer to the printer described in the next section. 6. Processing at the time of data transmission from the computer to the printer One of the features of the wireless switching system of the present embodiment is that high-speed data transmission between extension lines is possible. Therefore, a process for transmitting data from the computer to the printer in a burst will be described. The control procedure between the main device and the terminal is basically the same as the processing of the extension-to-extension call described above, and therefore the different portions will be mainly described.

First, the printing application program of the computer is started. Then, the wireless adapter driver installed in the data terminal operates and sends a data transmission request and a destination number (extension number of the printer) to the wireless adapter 4 via the communication interface unit 506.

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 device side. However, unlike the above extension call, a burst data frame (BD
Since it is necessary to use F), 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 as the transmission destination of the incoming call using the logical control channel (LCCH-T). Upon receiving the incoming call permission from the printer side, the main device assigns the BDF hopping pattern to be used to the computer on the sending side and the printer on the receiving side.

After the hopping pattern is assigned, the computer and the printer start data communication without going through the main unit.

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 are supposed to carry out transmission in sequence for each frame. During this time, the computer continuously transmits data for several frames, and then
Arrange how many frames the printer will send data. By taking such a procedure, it is possible to realize optimized channel use according to the application of the terminal.

After these steps are completed, the wireless adapter will perform error correction processing on the print data received from the computer, assemble a frame, and then send it to the printer. 450 kbps by using BDF
The degree of transmission becomes 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 In the previous section, the procedure of high-speed data transmission in the system was explained. In this system, not only in the system but also data transmission to the public network is possible, and it is possible to support applications such as personal computer communication.

Since the basic operation procedure is the same as the case of making an outside line from a wireless telephone, the description will be focused on the different parts.

First, when the personal computer communication application program of the computer is started, the wireless adapter driver installed in the data terminal operates,
Via the communication interface unit 506, the wireless adapter 4
Send an outside line request to.

Next, the wireless adapter enters the outside line transmission procedure. That is, the logical control channel (LCCHR)
An external line transmission request is sent to the main unit side, and an empty slot of PCF is assigned. After receiving the slot allocation, data will be transmitted using the 32 kbps slot of PCF.

In order to transmit data to the analog public line, it is necessary to modulate the data with a modem. Therefore, when transmitting data to the outside line, the data is modulated by the modem inside the wireless adapter 4 so that the data can be transmitted in the voice band (300 Hz to 3.4 kHz). Since the data modulated by the modem can be treated as voice information, this information is ADPCM encoded and frame assembled.

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

As described above, in this system, in addition to the call function that is used in the conventional telephone exchange device,
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.

Next, a second embodiment of the present invention will be described.

In the first embodiment, the analog public network is assumed as the public line. However, the development of a digital public network (for example, ISDN) is rapidly progressing at present, and it is conceivable to accommodate ISDN in the system in the future.

FIG. 12 is a block diagram showing the structure of a wireless adapter for ISDN.

In the figure, 1001 is an ISDN terminal,
Reference numeral 1002 is a wireless adapter for ISDN terminal, and 1003 is a wireless unit.

Further, the ISDN terminal wireless adapter 100
2, the main control unit 1004 has a C functioning as a control center.
It is composed of a PU, a peripheral device for interrupt control, an oscillator for a system clock, etc., and controls each block in the adapter.

The memory 1005 is composed of a ROM for storing programs used by the main controller, a RAM used as a buffer area for various processes, and the like. ISD
The N frame assembling / disassembling unit 1006 processes the layer 1 of the ISDN frame. That is, it has a function of converting an AMI 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.

The channel codec 1009 performs frame processing and radio control, and has a function of assembling data received from the ISDN terminal into a radio frame.

FIG. 13 is an explanatory view showing a frame for data communication between the ISDN terminal and the main unit.

In the figure, FSYN is a synchronizing signal, and LCCH-T is a logical control channel sent from the main unit to the wireless telephone. Further, LCCH-R is a logical control channel sent from the wireless-only telephone to the main device, ISDN-T is a data slot to be sent from the main device to the ISDN wireless adapter, and includes two audio channels of 64 kbps and 16 kbps. One control channel is multiplexed. ISDN-R is ISD
A data slot to be transmitted from the N wireless adapter to the main device, which includes two audio channels of 64 kbps and 16
One kbps control channel is multiplexed.

192 kbps received from the ISDN terminal
Data is decomposed by the assembly / disassembly unit of the ISDN frame in the wireless adapter, and only B channel data and D channel data are extracted. Taken out, 144 kb in total
Data for ps is put in ISDN-T in the frame of FIG. 13 and transmitted to the main device side.

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

Hereinafter, a procedure for the case where the video conference terminal having ISN i / f accesses ISDN via the main unit will be described.

When a call request is generated in the video conference terminal, ISDN layers 1 to 3 are activated and data transmission is started. In the wireless adapter, the D channel information is taken out at the assembly / disassembly section of the ISDN frame and the content is analyzed. As a result, an outgoing call request (SetUp
Command), the wireless link acquisition procedure is started. That is, in the same procedure as when making a call from the wireless telephone described in the first embodiment, the main device that sends a call request to the main device and receives the call request from the wireless adapter
Send a call request to the DN line.

When the other party responds after completing such a calling procedure, 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 in ISDN-T of the radio frame and ISDN
The B channel data sent to the terminal and conversely sent from the ISDN terminal are put in the ISDN-R of the radio frame and sent to the partner terminal.

In this way, 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, ISD is not always required.
It should be added that a terminal with an N interface is not necessary. If the terminal has a function of transmitting and receiving data at a transmission rate of 64 kbps or 128 kbps and a function of wirelessly communicating with the main device, the IS in the main device
Access to ISDN is possible using the DN line interface.

In particular, if the terminal itself incorporates the function of a wireless adapter, the ISDN frame assembling / disassembling unit and the like are unnecessary, and applications such as a video conference can be realized with a simpler configuration.

Next, a third embodiment of the present invention will be described.

In the above embodiments, low speed frequency hopping is used. However, a similar effect can be expected even when the direct spreading method is used. In the configuration of the main device shown in FIG. 2, this is the connection device 2 and the wireless telephone 3
Or by using a direct spreading method for the wireless unit of the wireless adapter 4.

FIG. 14A is an explanatory diagram showing an example of a communication procedure when the direct spreading method is used.

First, the communication is divided into a main device transmission frame and a slave device transmission frame on the time axis. That is, the main unit transmission frame and the slave unit transmission frame are alternately transmitted.

FIG. 14B is an explanatory view showing an example of the main unit transmission frame.

The main unit transmission frame has control information and data slots for each wireless terminal. FSYN in the figure
Is a synchronization signal, Ck is control information from the main apparatus to the wireless terminal k, Tk is transmission data corresponding thereto, and GT is a guard time.

FIG. 14 (3) is an explanatory diagram showing an example of the slave unit transmission frame.

Each wireless terminal transmits control information and data in a certain time slot assigned in the slave device transmission frame. FSYN in the figure is a synchronization signal, and 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 which connection device or wireless terminal the transmission data is directed to. In this wireless switching system, internal communication and communication with external lines are performed, but control of communication path establishment is performed by a main device, and the main device manages the state of each wireless terminal and all communication.

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.

In the above embodiments, the configuration example in which the connection device 2 having the wireless communication function is connected to the outside of the main device 1 has been described. However, the connection device 2 built in the main device 1 is described. Can also obtain the same effect. That is, in the present application, the main device described in the claims is a concept including the connecting device as described above, and a configuration in which the connecting device is externally attached as shown in the embodiment is also a A configuration including a function is also included in the present invention.

[0216]

As described above, according to the first invention of the present application, in the wireless switching system using the spread spectrum communication system of the frequency hopping system, the control information is transmitted / received to / from the main device and each terminal. Even if the system is provided with a means for transmitting control information while hopping, the terminal does not have to wait on the same frequency as other terminals to receive the control information, and processing is not confused. effective.

Further, according to the second invention of the present application, the terminal ID is used as the independent information for each terminal, the input is easy, and the information already used as the extension number or the like is diverted, which is convenient. There is an effect that can improve.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a system configuration according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a main device of the first embodiment.

FIG. 3 is a block diagram showing a configuration of a connection device of the first embodiment.

FIG. 4 is a block diagram showing a configuration of a wireless telephone according to the first embodiment.

FIG. 5 is a block diagram showing a configuration of a wireless adapter of the first embodiment.

FIG. 6 is a block diagram showing the configuration of a wireless adapter with a built-in modem according to the first embodiment.

FIG. 7 is a block diagram showing a configuration of a wireless unit of the first embodiment.

FIG. 8 is an explanatory diagram showing a frame format used in the first embodiment.

FIG. 9 is an explanatory diagram showing a frame format used in the first embodiment.

FIG. 10 is a block diagram showing a configuration of a channel codec of the first embodiment.

FIG. 11 is an explanatory diagram showing a frequency hopping method used in the first embodiment.

FIG. 12 is a block diagram showing the configuration of an ISDN wireless adapter according to a second embodiment of the present invention.

FIG. 13 is an explanatory diagram showing a data communication frame between an ISDN terminal and a main device according to the second embodiment.

FIG. 14 is an explanatory diagram showing a communication procedure and a communication frame according to the third embodiment of the present invention.

FIG. 15 is an explanatory diagram showing a sequence at power-on of the first embodiment.

FIG. 16 is a flowchart showing the operation of the main device of the first embodiment when the power is turned on.

FIG. 17 is a flowchart showing an operation when the power of the wireless terminal of the first embodiment is turned on.

FIG. 18 is an explanatory diagram showing a sequence when an outside line is transmitted in the first embodiment.

FIG. 19 is a flow chart showing the operation of the main unit of the first embodiment when making an outside line call.

FIG. 20 is a flowchart showing an operation of the wireless terminal of the first embodiment when making an outside line call.

FIG. 21 is an explanatory diagram showing a sequence when an outside line is called in the first embodiment.

FIG. 22 is a flowchart showing an operation of the main device of the first embodiment when an external line is received.

FIG. 23 is a flowchart showing an operation of the wireless terminal of the first embodiment when an external line is received.

FIG. 24 is an explanatory diagram showing a sequence during extension communication according to the first embodiment.

FIG. 25 is a flowchart showing an operation of the main device of the first embodiment during extension communication.

FIG. 26 is a flowchart showing an operation of the wireless terminal according to the first embodiment when making an extension call.

FIG. 27 is a flowchart showing an operation of the wireless terminal of the first embodiment when receiving an extension call.

FIG. 28 is a block diagram showing a configuration example of a main device of a conventional wireless communication system.

FIG. 29 is a block diagram showing a configuration example of a connection device of a conventional wireless communication system.

FIG. 30 is a block diagram showing a configuration example of a wireless terminal of a conventional wireless communication system.

FIG. 31 is an explanatory diagram showing an example of a transmission sequence of a conventional wireless communication system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main apparatus, 2 ... Connection apparatus, 3 ... Wireless telephone, 4 ... Wireless adapter, 5 ... Data terminal, 7 ... Analog public line, 9 ... Digital public line, 10 ... Single telephone, 11 ... Facsimile.

Claims (2)

[Claims] 1. A wireless switching system using a spread spectrum communication system, which is a frequency hopping system, having a main device for exchange and one or more terminals, wherein control information is provided to the main device and each terminal. In addition to providing a means for transmitting and receiving, each terminal is provided with a means for determining a frequency at which the control information sent from the main device while hopping is initially waited, and the means for determining the frequency is for each terminal. A wireless switching system characterized by making a decision based on information given independently. 2. The wireless switching system according to claim 1, wherein the information independently given to each terminal is an ID given to each terminal.