JPH09200183A - Radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of a communication channel not available due to a hopping pattern not in use by allocating the hopping pattern discriminated not in use to other communication so as to use the pattern. SOLUTION: The system is made up of an exchange 101 containing a public line 102 and having an exchange function and a radio connection function, radio exclusive telephone sets 103-A, 103-B making communication with control data and voice data with the exchange 101, and data terminal equipments 104-A, 104-E making direct data communication between themselves and making communication with control data with the exchange 101. Then a control station managing a frequency hopping pattern inquires of other radio stations being controlled stations periodically about the use state of the hopping pattern and the other radio stations reply a reply corresponding to it and when no reply is received, the hopping pattern is discriminated to be a non-use pattern and it is allocated to other communication.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system for performing wireless communication by a spread spectrum system.

[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 radio telephone exchange apparatus 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 structure and basic operation of each part of the conventional wireless communication system will be described below. <Structure of Main Device> FIG. 46 is a block diagram showing a structure of a conventional wireless communication system and a structure of its main device. 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.

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

As shown in FIG. 46, 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 a dedicated telephone under the control of the CPU (J101) when the main unit is normally energized, and has a call function as an SLT at the time of power failure. , Has a display and the like. 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 J2 in order to accommodate the connection device J2 under the control of the CPU (J101). <Configuration of Connection Device> FIG. 47 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 device 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, processing such as decompression is performed and PCMCODEC ( J206). At the same time, the voice processing LSI D / A-converts the control data transmitted from the CPU (J201) and transmits it to the wireless unit J208, and also the PCMCODEC (J20).
The audio signal from 6) is subjected to processing such as scrambling and compression, and then transmitted to the wireless unit J208.

The wireless unit J208 is a CPU (J2
01) under the control of a voice processing LSI (J20
7) The control data and voice signal from 7) are modulated and processed so that they can be transmitted wirelessly, and the signals are transmitted to the wireless dedicated telephone J3, and the signal received from the wireless dedicated telephone J3 is demodulated to obtain control data and The audio signal is taken out and transmitted to the audio processing LSI (J207). <Configuration of Radio Dedicated Telephone> FIG. 48 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, processing such as decompression is performed and output to the speech path unit J305, and the control data transmitted from the CPU (J301) is D / A converted and transmitted to the wireless unit section J307 to be transmitted from the speech path unit J305. Processing such as compression of the audio signal is performed and transmitted to the wireless unit 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 and output a voice signal for a call, and the microphone J309 is used for
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. 49 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.

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

When the wireless dedicated telephone J3 receives the channel movement response signal in the above sequence J404 and confirms the establishment of the wireless line, it transmits 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).

When the call is started, the connection device J2 and the wireless telephone J3 monitor whether or not the other party is transmitting radio waves through the wireless unit (detect the carrier of the frequency transmitted by the other party). To). When it is determined that the radio wave from the other party is not received (when the radio wave is not continuously received for a certain period of time), the radio wave itself is also stopped.

In the case of a small power cordless telephone, the Machichi access is realized by dividing the frequency used for the call, and the carrier of the frequency being used is monitored, and the far end where the radio wave does not reach the other party during the call. When it separates, it also stops transmitting radio waves and releases its frequency resources.

[0022]

However, in a radio communication system using a frequency hopping method in spread spectrum communication, for example, when attempting multi-access such as the above-mentioned low power cordless telephone, the frequency hopping method is not used. Since one communication (communication performed in one frequency band in a small power cordless telephone) is performed while hopping a plurality of frequency bands, it cannot be determined by carrier sense of the frequency band whether communication is in progress. If the communication partner moves out of the range of the radio wave, the resource (channel) for multi-access is lost.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a wireless communication system which prevents the generation of an unusable communication channel due to an unused hopping pattern. is there.

[0024]

In order to achieve the above object, the present invention provides a control station and a plurality of controlled stations that perform spectrum spreading by frequency hopping according to a predetermined hopping pattern and manage the hopping pattern. In a wireless communication system for performing communication by multiplexing a plurality of wireless frames between the control station and the controlled station, a unit for inquiring the usage status of the hopping pattern at a predetermined cycle, and a response to the inquiry The hopping pattern is determined to be unused, and the hopping pattern is determined to be unused when the determination means determines that there is no response. Used for communication.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the present embodiment, a case will be described where digital radio communication by the frequency hopping method is used for extension transmission of a 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 FIG.
1 for accommodating a computer and having a switching function and a wireless connection function
01, a plurality of wireless dedicated telephones 103-A, 10 for communicating control data and voice data with the exchange 101.
3-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
It is defined as "a terminal (data terminal) having a function of transmitting an arbitrary amount of data in a burst and a wireless adapter that controls wireless communication between the data terminal and the main device". The data terminal is a computer 104-
Not only A, but also the printer 104-B, the copying machine 104-C,
Video conference terminal 104-D, facsimile 104-E,
The LAN bridge 104-F and other terminals such as an electronic camera, a video camera, and a scanner, which are not shown, perform various data processing.

A major feature of this system is that the above-mentioned wireless 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 Device> First, the configuration of the main device of the system according to the present embodiment that accommodates a public line will be described.

FIG. 2 is a block diagram showing the configuration of the system and the configuration of the main device according to this embodiment. In the figure, the main device 1 accommodates a plurality of outside lines and a plurality of terminals,
It is the main part of this system that exchanges calls between them. Further, the connection device 2 receives the control of the main device 1 and controls the wireless terminal wirelessly in order to accommodate the wireless terminal (a wireless dedicated telephone, which will be described later, a data terminal connected to a wireless adapter) in the system. 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 unit 1 through the connecting 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,
Controls the entire main unit including exchange control. Also, CP
U201 allocates a channel in response to a channel allocation request from a terminal sent via a connection device i / f210, which will be described later, and manages an empty channel,
The information is temporarily stored in the RAM 203 described later.

The ROM 202 stores a control program for the CPU 201, and the RAM 203 stores various data for controlling the CPU 201 and provides a work area for various calculations. Also, the call path unit 204
Is a call exchange (time division exchange) under the control of the CPU 201.
Under the control of the CPU 201, the PSTN line i / f 205 controls the incoming call for accommodating the PSTN line 7,
Performs PSTN line control such as selection signal transmission and DC loop closure. Furthermore, the ISDN line i / f206 is a CPU
An IS for accommodating an ISDN line under the control of 201
It supports layer 1 and layer 2 of DN and performs ISDN line control. And SLTi / f207 is the CPU
Under the control of 201, power supply for accommodating the SLT 10,
Loop detection, selection signal reception, ringing signal transmission, etc. are performed.

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

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

The above-mentioned channel codec 307 is a CP
Under the control of U301, 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. <Configuration of Radio Dedicated Telephone> FIG. 4 is a block diagram showing the configuration of the radio dedicated telephone 3 according to the present 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 4
01 control program stored in EEPROM 403
Stores the calling code (system ID) of the system and the sub ID of the wireless telephone. In addition, RAM404
Stores various data for controlling the CPU 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 microphone 411 collects and inputs the voice signal. 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 section 506 is a communication i / f that is standardly equipped with various data terminal devices such as the above-described data terminal 501, for example, a communication i / f such as RS-232C, Centronics, and LAN. 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 transmitting data 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, the modem 511 modulates data into a voice band signal, and the ADPCM codec 512
Encodes the signal modulated by the modem 511. Then, the ADPCM-encoded data is assembled into a frame by a channel codec to be described later, and then the radio unit 503.
Will be transmitted to the main device 1 via the. <Structure of Radio Unit> FIG. 7 is a block diagram showing the structure of a radio unit commonly used by the main unit, the wireless telephone, and the data terminal of the present system. As shown in the figure, the radio unit includes transmitting / receiving antennas 601a and 601b and an antenna 601.
a and b changeover switch 602, a band pass filter (hereinafter, referred to as BPF) for removing a signal in an unnecessary band.
603, a transmission / reception changeover switch 604, a reception system amplifier 605, a transmission system amplifier (with power control) 606, 1st. IF down converter 60
7, an up converter 608, a transmission / reception changeover switch 609, and a BPF 61 for removing a signal in an unnecessary band from the signals converted by the down converter 607.
0, 2nd. With a down converter 611 for IF,
These down converters 607 and 611 form a double conversion system reception mode.

2nd. BPF612, 9 for IF
A 0 ° phase shifter 613 and a quadrature detector 614 are provided.
The BPF 612 and the 90 ° phase shifter 613 detect and demodulate the received signal. Further, it is composed of a waveform shaping comparator 615, a voltage control type oscillator (hereinafter referred to as VCO) 616 of a receiving system, a low pass filter (hereinafter referred to as LPF) 617, a programmable counter, a prescaler, a phase comparator, and the like. P
LL618 and these VCO616, LPF61
7, the PLL 618 constitutes a frequency synthesizer of the receiving system.

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

The clock 625 is the above-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 its unnecessary band signal removed by the BPF 603, and then the antenna 601.
Radio waves are emitted from a and b into space. (2) Operation during reception The signals received by the antennas 601a and 601b are BPFs.
After the unnecessary band signal is removed by 603, it is amplified to a predetermined level by the receiving system amplifier 605. Then, the down converter 607 removes the carrier signal from the received signal amplified to a predetermined level, and the 1st.
Converted to IF frequency. This 1st. The received signal of the IF is further processed in the 2nd. It is input to the down converter 611 for ID.

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

The quadrature detector 614 performs detection and demodulation using the signal whose phase is shifted by the 90 ° phase shifter 613 and the original signal. This quadrature detector 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 dedicated telephone, and LCCH-T is a logical control channel sent from the wireless dedicated telephone to the main unit. , T1,
T2, T3, T4 are voice channels sent to four different wireless dedicated telephones, R1, R2, R3, R4 are voice channels transmitted from four different wireless dedicated telephones, G
T represents a guard time. Further, F1 and F shown in FIG.
Reference numeral 3 denotes a frequency channel used when wirelessly transmitting the above frame, and indicates that the frequency channel is changed for each frame.

In the PPF shown in FIG. 9, FSYN is a synchronization signal, LCCH-T is a logical control channel sent from the main unit to the wireless dedicated telephone, and LCCH-R is a logical control channel sent from the wireless dedicated telephone to the main unit. , T1,
T2 and T3 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

In addition, F1, F3, F5 and F in FIG.
7 is a frequency channel used when wirelessly transmitting the above-mentioned frame. Unlike PCF, the frequency channel F1 receives logical control information LCCH-T from the main unit, and then the frequency channel is exchanged between the radio-dedicated telephones. 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 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 the time of carrier sense for confirming that the previous frame is finished and for confirming whether another wireless device is not emitting a radio wave, PR
1 is a preamble for each slot, UW is a unique word including a sub ID, D is 3.2 kbps D channel information, B is 32 kbps B channel information, and GT is a guard time. 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 wireless section 802, an ADPCM codec 803 built in a wireless dedicated telephone, etc., and a CPU 804 of a wireless dedicated telephone or a wireless adapter. Further, inside the channel codec 801, the wireless control unit 80
5 controls transmission / reception switching and frequency hopping with respect to the radio unit 802. This wireless controller 805
Further, it also has a function of performing carrier detection prior to data transmission.

The ADPCM codec i / f 806 is A
Serial data and synchronous clocks for exchanging audio signals with the DPCM codec 803 are exchanged. The CPU I / F 807 is an i / f for exchanging control information with the CPU 804, and is an ASIC.
Each has a built-in register that stores the state and operation mode of each unit therein, and controls each unit of the ASIC according to the control signal from the CPU 804 and the state of each unit in the ASIC. 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 wireless control unit 805 switches the wireless 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) Non-communication At the time of no call, the main unit waits at the frequency assigned in advance and receives the LCCH-T from the main unit which is periodically sent. At this time, the LCCH sent from the main device includes information such as whether or not there is an incoming call to the outside line and whether or not there is a call request to the wireless telephone.
Then, the wireless telephone sends the LCCH extracted by the reception frame processing unit to the CPU. After that, the LCCH sent from the CPU to the main device is sent to L in the same frame.
It is sent to the main device by CCH-R. Thus, the wireless-only telephone repeats the above procedure until a call is made or an incoming call is made. (3-2) At the time of communication A case where the wireless telephone A makes a call will be described as an example.

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

When the contents of the LCCH from the main unit after the call request is made and the line cannot be connected, the wireless telephone A informs the user that the line 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 frequency channels according to the frequency hopping pattern designated by TS 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 communication between wireless dedicated telephones, control information is exchanged between wireless dedicated telephones using D channel information, and after the communication is completed, the LCCH-R of the frequency channel for which each wireless dedicated telephone is designated. 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 each having a width of 1 MHz, which uses a band of 26 MHz 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, one frame of communication data has a length of 5 ms as shown in FIG.
Hopping the frequency channel for each frame. Therefore, the length of one cycle of one hopping pattern is 10
0 ms.

In FIG. 16, different hopping patterns are shown with different patterns, and if limited to the system, it is possible to perform communication by the number of these hopping patterns at the same time. In this way, a pattern is used in each frame such that the same frequency is not used at the same time. This makes it possible to prevent data errors and the like from occurring. Further, when accommodating a plurality of connecting devices, different hopping patterns are used for the respective connecting devices in order to prevent interference between the connecting devices. With this method, a system having a multi-cell configuration can be realized and a wide service area can be obtained. <Explanation of detailed operation> As described above, in the present system, frames are assembled for communication between the main device, the wireless telephone and the data terminal, and between the terminals, and the frequency to be used is set at regular intervals. Control to switch to.

The specific operation of this system will be described in detail below. <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 main unit is notified of that fact 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 main device (connecting device) and the wireless terminal are powered 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 determined. Subsequently, in step S2203, the PCF frame to which the hopping pattern (frequency hopping in the next unit time) and the ID of the present system are added is transmitted to the wireless terminal 103 (see FIG. 1).

At this time, the ID part (see FIG. 11) in the PCF frame contains the system ID, and the NFR part contains the information of the frequency hopping in the next unit time in the hopping pattern. The LCCH unit (see FIG. 13) includes information on an idle control channel that can be used on the wireless terminal side.

20 and 21 are diagrams showing an example of the format of the LCCH section showing the information of the idle control channel.
Here, for example, in FIG. 20, the vacant information is LCC.
At the beginning of the H part, an 8-bit code (0A) indicating empty information and the empty information following the code are shown in bit units. In the example shown in the same figure, “0” is associated with “vacant” and “1” is associated with “in use”, and information of 20 channels is included.

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 in the sequence 2 shown in FIG.
101 to 2103.

When the above notification is completed, the contents of the RAM 203 storing the empty channel information are rewritten,
While using the channel assigned to the wireless terminal 103,
Send free information. Then, when all the information is assigned, all the above 20 bits are set to "1" and transmitted.

The method of notifying the free channel information is made independent for each frequency, and the free information of the F1 channel is F1 and the free information of the F20 channel is F20.
You may make it notify by a CCH part. (2) Operation at the time of turning on the power of the wireless terminal When the power switch of the main body of the wireless terminal 103 is turned on, the setting mode is set, and the wireless terminal 103 performs the step S
As shown in 2301, initial setting of the main body is performed. Subsequently, in step S2302, when the ID of the wireless terminal 103 is manually input, the wireless terminal 103 receives this I
Remember D.

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. Following Step S2304
If the PCF frame can be received from the main device 1 (connecting device 2), the system ID is recognized from the ID section (see FIG. 11) in the PCF frame in step S2305.
At the same time as storing, free channel information (frequency for transmitting a PCF frame from the wireless terminal to the main device) is acquired from the LCCH unit (see FIG. 13).

In step S2306, the empty channel information is checked, and if there is an empty channel, the frequency to hop next per unit time is acquired from the NFR part in the PCF frame, and the wireless terminal 103 sets the received frequency to that frequency. Move and wait for next PCF frame. Wireless terminal 10
3 repeats this operation, recognizes the frequency hopping pattern, and stores it (step S2307).

On the other hand, if it is determined in step S2306 that there is no free channel, the user is notified of that fact (step S2310), and after a certain period of time, the power is turned off (step S2311). Here, as a method of notifying the user that there is no vacant channel, in the wireless dedicated telephone shown in FIG. 4, for example, notification is made by sound from the speaker 412, display on the display unit 414, or both of them are used. There are methods such as notification. Also, FIGS.
In the wireless adapter shown in FIG.
The data terminal 501 is notified via the
There is a method of displaying by software control, notification by sound, or displaying by making the adapter itself have an LED or the like.

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) to the main device (step S2308).

After the above processing, the main device 1 (connecting device 2)
Upon receiving the control channel frequency designation information from the wireless terminal 103, the wireless terminal 103 starts discontinuous reception on the designated control channel (step S2309), and shifts from the setting mode to the normal mode. <Process when making an outside line from a wireless telephone> FIG.
It is a sequence diagram of an outside line transmission in the present embodiment,
FIG. 23 is a flowchart showing the operation of the wireless-only telephone 3 when making an outside line call, and FIG. 24 is a flowchart showing the operation of the main device 1 when making an outside line call.

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. 23), the wireless telephone 3 displays on the display unit corresponding to the pressed outside line button. 414
The outside line LED of is transmitted and blinked (step S2502),
An external line transmission signal (2402 in FIG. 22) is transmitted to the main device 1 via the connection device 2 (step S2503). This external line transmission signal is transmitted on the radio link between the radio telephone 3 and the connection device 2 on the LCCH of the PCF frame shown in FIG.
-R, and in the connection device 2, the main device i /
The main device is notified by f305.

Upon receiving the outside line transmission signal (2401 in FIG. 22), the main unit 1 determines whether or not outside line transmission is possible (step S2601 in FIG. 24), and if the outside line is free and transmission is possible, the main line 1 transmits. 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 judges that the wireless dedicated telephone 3 side is ready, and the outside line LE.
For example, in order to turn on D in green, an outside line display green constant light instruction (2407) is transmitted to the connection device 2 (step S2).
605). Further, the communication path with the captured outside line is connected (step S2606).

On the other hand, the wireless telephone 3 receives the outside line display green constant light instruction signal (2408) from the connection device 2 (step S2506), turns on the outside LED in green, and the communication path inside the telephone 3 for wireless communication. 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 device 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).

In the main unit 1, the dial (2412) 1
When the digit is received (step S2607), the dial signal is started to be transmitted to the outside line, and the dial transmission is monitored again at time-out (step S2608). When the dial transmission is completed, the call is in progress (step S26).
09).

When the call ends 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. 25 is a sequence diagram of an outside line receiving in the present embodiment, and FIG. 26 is a flowchart showing an operation of the main device when receiving an outside line.

When it is determined in step S2801 in FIG. 26 that an incoming call has arrived 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 wireless dedicated telephones 103-A, B. 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. 27 is a flow chart showing the operation of the wireless telephone when an outside line is received in the present embodiment. In step S2901 of the figure, when the wireless-only telephone receives the outside line incoming signal (2703 in FIG. 25) from the main unit 1, the wireless-only telephones 3-A and B ring a ringing tone or the like, and go off-hook in step S2902. Detect whether or not. Then, the wireless telephone 103-
If A goes off-hook, it proceeds to step S2903 and sends an off-hook signal 2706 to the main device 1. If the outside line response permission signal 2709 is sent from the main device 1 in step S2904, step S2905.
Then, the audio channel is connected and the audio channel connection completion signal 2710 is transmitted to the main device 1.

In step S2906, 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 there, the on-hook signal 2718 is sent to the connection 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, the wireless-only telephone set 1010 does not go off-hook in one wireless-only telephone set.
When the external line termination cancellation signal 2717 is transmitted to the 3-B, the wireless telephone 103-B proceeds to step S2912.
At the display portion 414, an outside line busy display is displayed. Further, the wireless-only telephone 103-B operates in step S2913.
, The external line in-use display is continued on the display unit 414 until the external line in-use display stop signal 2723 arrives.
At 2914, the outside line busy display is turned off. <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. 28 is a sequence diagram showing a 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. 29 shows the main device during the extension communication. 30 is a flowchart showing the outline processing of FIG.
FIG. 31 is a flowchart showing an outline process in the calling side dedicated telephone, and FIG. 31 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. 30), the wireless telephone 103-A receives the extension communication signal (300 in FIG. 28).
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. 30). The last dial is monitored by timeout.

When the main device 1 receives the dial information (3007) from the connection device 2 (step S31 in FIG. 29).
05), analyzes the contents of the dial, and transmits the LCC of the PCF frame to the wireless telephone 103-B via the connection device 2.
An extension incoming call (3009, 3010) using HT is transmitted (step S3106). This extension incoming signal (3
010) is received, the wireless telephone 103-B sounds the speaker 412 or blinks the LED to notify the operator of the incoming call and prompt a response (step S of FIG. 31).
3302). Then, the user inputs the key matrix 413
Operate 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 telephone 103-B, the main unit 1 (step S31)
(YES in 07), the extension response (3013) is sent to the connection device 2, and the connection device 2 also sends the wireless dedicated telephone 103-A.
An extension response (3014) is transmitted to the device to notify that the wireless telephone 103-B has responded. This extension response (3013) includes the CPU 201 in the main device 1.
However, communication resources such as empty time slots and hopping patterns stored and managed in the RAM 203 and voice channels (T1 to T4, R1 to R4) in the PCF frame to be used are stored in the wireless dedicated telephone 103-A and the wireless dedicated telephone. 1
The communication resource information is allocated to the direct communication of 03-B, and this communication resource information is transmitted to the wireless dedicated telephone 103-A via the connection device 2 as an extension response (3014) using the LCCH-T of the PCF frame (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 of the other party (ringback tone) 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, 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). Take, connection device 2
Through the audio signal connection completion signal (3
017, 3018) is transmitted.

That is, during the direct communication of the wireless 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.

Note that while direct communication is performed between telephones,
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 connection of the voice channel from the wireless telephone 103-B via the connection unit 2 (30
If 17) is received (step S3109), it is determined that the telephones 103-A for exclusive use of wireless communication and the telephones for exclusive use of wireless communication 103-B have started a call, and waiting for the reception of the extension communication end signal or the wireless transmission state is bad. It is determined whether or not (step S3110). On the other hand, the wireless telephone 10
3-A and the wireless telephone 103-B monitor the wireless line status and the user's operation of the key matrix 413.

After the call is completed, the wireless telephone 103-A
If on-hook is detected in step S60, or if it is determined that the wireless transmission state is poor (YES in step S3209).
S), the wireless dedicated telephone 103-A transmits an 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).

The wireless telephone 103-A which has received the on-hook confirmation signal (3021) in step S3211
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 device 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 extension lines can be realized, but the basic part of the above procedure is also used in the data transmission from the computer to the printer 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 a call between extension lines. That is, the logical control channel (LCCH-
R) sends an extension call request to the main unit. However,
Unlike the above-mentioned extension call, since it is necessary to use a burst data frame (BDF), the extension call request event information contains information requesting BDF allocation.

Upon receiving the extension call request event information, the main unit notifies the wireless adapter connected to the data transmission destination printer 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.
At the start of communication, the computer and the printer transmit in sequence for each frame. During this period, the computer determines how many frames of data should be continuously transmitted, and then how many frames of data should be transmitted from the printer.
By taking such a procedure, it is possible to realize optimized channel use according to the application of the terminal.

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

Not only the data transmission from the computer to the printer but also the 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 started, the wireless adapter driver incorporated in the data terminal operates to send an outside line transmission request to the wireless adapter 4 via the communication interface section. As a result, the wireless adapter enters the outside line calling procedure. In other words, the logical control channel (LCCH-R) is used to send an external line transmission request to the main device side and receive an allocation of an empty slot of PCF. After the slot is assigned, the data is transmitted using the slot having the PCF transmission rate of 32 kbps.

On the other hand, in order to transmit data to the analog public line, it is necessary to modulate the data by 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 deal with applications such as personal computer communication using the same procedure as that of a normal voice call. <Hopping Pattern Usage Confirmation Processing> FIG. 32 is a diagram showing the structure of a hopping pattern usage confirmation frame. The frame shown in the figure has a hopping pattern (H
P) is transmitted from the control station of P) to another radio station (controlled station) that is not the control station, and the identification code “0B” in the LCCH-T frame is the hopping indicated by the confirmation hopping code described later. It is a code that indicates whether or not to inquire whether or not there is a wireless station using the pattern.

Further, the confirmation hopping pattern code is a code indicating a hopping pattern for confirming whether or not it is in use. This code is expressed by the code, and TS (in the FSYN frame shown in FIG. 11 is used. (Time slot information) and is represented by a binary code “1 to 20” indicating T1 to T20 on the time axis of FIG.

Codes 1 to 20 indicating T1 to T20
Is T1 which is the reference time for transmitting and receiving the LCCH information on the frequency F1, and T2, T
3, T4 to T20 are information for managing time slots. From the contents of this information, in addition to the information that manages the time slot, the information that manages the hopping pattern, and the communication channels that are divided by the hopping pattern (In the conventional low power cordless telephone, it is divided by the frequency. Corresponds to the call channel) can also be treated.

In this embodiment, the confirmation HP code in the frame is replaced with the codes 1 to 20 of T1 to T20.
In binary code.

FIG. 33 is a diagram showing the structure of a hopping pattern use response frame as a response frame corresponding to the HP use confirmation frame in the LCCH-R frame. This frame is sent from a wireless station that is not the HP management station.
This is a frame returned to the P management station.

This HP use response frame is transmitted only when the HP confirmed by the control station is being used, and is not transmitted when the HP is not being used. Also, H
The P use response frame is the same as the HP use confirmation frame 5
It does not have to be returned within ms, and in the present embodiment, if the use response frame is returned within 4 cycles (within 400 ms) after the control station transmits the HP use confirmation frame,
If the pattern is recognized as being in use and there is no response within the above time, it is determined as an unused HP. Then, when there is a request for HP allocation from another terminal,
Allocate the HP to other terminals.

If the HP use response frame is not returned within 4 cycles and the control station receives the use response frame after that, the control station does not use the HP and releases it. Notify the wireless station that returned the HP use response frame. The structure of the HP release request frame in the LCCH-T frame is shown in FIG.

The reason why the HP use response frame is not returned is, for example, that the controlled station turns off its power,
Alternatively, it is possible that the user has moved out of the coverage area.

Upon receiving the above HP release request frame, the radio station sends the HP release response frame (LCCH-R frame) shown in FIG. Is assigned. If the wireless station is in communication at the time of attempting to release the HP, the wireless station notifies the user of the communication abnormality and waits for the user's communication end operation.
Then, the HP may be released after the operation is completed, or the communication abnormality may be notified without waiting for the operation and the communication may be forcibly ended after a predetermined time.

The above-mentioned processing for confirming the use of HP is basically performed by the control station independently of other processing such as a telephone call at every HP and at a fixed time. For a wireless station that has been determined to be in communication or a wireless station that has communicated within a certain period of time, a method such as omitting the confirmation process may be used.

36 and 37 are flowcharts showing the HP use confirmation processing procedure in the control station according to the present embodiment.
38 and 39 are flowcharts showing the HP usage confirmation processing procedure in the controlled station, and FIG. 40 is a diagram showing the sequence of HP usage confirmation processing.

In step S4001 of FIG. 36, HP allocation is initialized, and in step S4002, HP is initialized.
Determine whether or not there is confirmation of use. When the HP use confirmation is performed, an HP use confirmation request frame is transmitted in step S4003. In a succeeding step S4004, the timer for counting the above four cycles is activated, and the step S4004 is executed.
At 4005, it is determined whether the time is up or LCCH-R is received.

When it is determined that the time is up in step S4005, the process proceeds to step S4007,
Therefore, the HP release request frame is assembled and transmitted. Then, in a succeeding step S4008, the HP is put into an unused state. In step S4005, LCCH-R
If it is determined that the reception has been performed, the process shown in FIG. 37 is performed. In the other cases, the other process is performed in step S4006.

In step S4101 of FIG. 37, the received LCCH-R frame is analyzed, and if it is an HP release response frame, it is left as it is and the process returns to step S4002 of FIG. Also, the received LC
If the CH-R frame is the HP use confirmation response, it is determined in step S4102 whether or not the designated HP is unused, and if it is unused, the following step S41
At 03, an HP release request frame is assembled and transmitted. However, if it is determined in step S4102 that the designated HP is not unused, the process immediately returns to step S4002 in FIG.

In the case other than the above, step S4
In 104, other processing is executed, and the processing returns to step S4002 in FIG.

As processing in the controlled station, initialization of HP allocation and the like is performed in step S5001 of FIG. 38, and it is determined whether or not the LCCH-R frame is received in step S5002. Here, if it is determined that the frame has been received, it is determined as a HP use confirmation request in step S5003 whether or not the designated HP is used by the own station. If the decision result in the step S5003 is YES, a HP use confirmation response frame is assembled and sent out in a step S5004.

On the other hand, if the HP release request is determined in step S5002, the process proceeds to the process shown in FIG. 39. Otherwise, in step S5005, other processes are performed.

In the case of the HP release request, in step S5101 shown in FIG. 39, it is determined whether or not the designated HP is used by the own station, and if so, in subsequent step S5102,
It is determined whether the terminal is in communication. Then, if the terminal is in communication, in step S5103, the user is notified of the abnormality as described above, and processing such as an instruction to terminate communication is performed.

However, if it is determined in step S5102 that the terminal is not in communication, step S510.
At 4, the HP release response frame is assembled and transmitted. Then, the process is returned to step S5001 in FIG.

As described above, according to the present embodiment, the control station that manages the frequency hopping pattern is
It is configured to periodically inquire of other radio stations that are controlled stations about the usage status of hopping patterns, and the other radio stations are configured to return a response. If there is no response, the hopping pattern is not used. As a result, by allocating to another communication, even if a terminal in which wireless communication is disabled occurs, the hopping pattern allocated to the terminal can be effectively used.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention. Therefore, a modification of the above embodiment will be described below. <Modification 1> In the above embodiment, an analog public network is assumed as a public line, but the present invention is not limited to this, and a digital public network (for example, a digital public network which is currently being rapidly developed) is used.
ISDN) may be accommodated in the system.
Therefore, as a first modification, an operation when an ISDN terminal is connected to the present system will be described.

FIG. 41 is a block diagram showing a structure of a wireless adapter for ISDN according to this modification. As shown in the figure, the ISDN terminal wireless adapter 1002 is
The SDN terminal 1001 and the wireless unit 1003 are connected,
Inside thereof, for example, a main control unit 1004 configured of a CPU, a peripheral device performing interrupt control, an oscillator for a system clock, etc. for controlling each block in the adapter, and a program used by the main control unit 1004. A memory 1005 including a ROM for storing, a RAM used as a buffer area for various processes, and the like.
Layer 1 processing of an SDN frame, that is, ISDN frame assembly / composition having 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. Decomposition part 10
06, frame processing, radio control, IS
A channel codec 1007 having a function of assembling data received from a DN terminal into a radio frame is provided.

FIG. 42 is a diagram showing the structure of a data communication frame between the ISDN terminal and the main unit. In the figure, FSYN is a synchronization signal, LCCH-T is a logical control channel sent from the main unit to the wireless-only telephone, LCC.
HR is a logical control channel sent from the wireless-only telephone to the main unit, ISDN-T is a data slot sent from the main unit to the ISDN wireless adapter, and is 64 kb.
Two ps voice channels and one 16 kbps control channel are multiplexed.

The 192 kbps data received from the ISDN terminal 1001 shown in FIG. 41 is the ISDN frame assembling / disassembling unit 1 in the ISDN terminal wireless adapter 1002.
It is decomposed in 006, and only B channel data and D channel data are extracted. Here, the total 14
The data of 4 kbps is I in the frame shown in FIG.
Put it in SDN-T and send it to the main unit.

On the contrary, the data from the main unit is received by the ISDN-R in the frame shown in FIG. Then, a predetermined layer 1 is added to the received 144 kbps data.
Information is added, converted into an AMI code, and then transmitted to the ISDN terminal 1001.

The procedure when the video conference terminal having ISDNi / f accesses the ISDN via the main unit is as follows.

When a call request is generated in the video conference terminal, ISDN layers 1 to 3 are activated and data transmission is started. For wireless adapters, ISDN
The frame assembling / disassembling unit 1006 extracts the D channel information and analyzes the contents. As a result, when the call origination request (SetUp command) is issued, the procedure for acquiring the wireless link is started. That is, the call origination request is sent to the main device in the same procedure as when the call is made from the wireless-only telephone set, and the main device receiving the call origination request from the wireless adapter sends the call origination request to the ISDN line.

When such a calling procedure is completed and the other party responds, exchange control for connecting the B channel on the ISDN line side to the connecting device is performed. Then, the B channel data received from the partner terminal is put in the ISDN-T (see FIG. 42) of the radio frame and sent to the ISDN terminal, and conversely, IS
The B channel data transmitted by the DN terminal is put in the ISDN-R of the radio frame and sent to the partner terminal.

In this way, the wireless switching system I
An SDN terminal can be accommodated, and digital data communication can be performed at a desired speed wirelessly.

In order to carry out an application such as a video conference via ISDN, ISDN is not always required.
It does not require a terminal with an interface.

That is, 64 kbps or 128 k
A terminal having a function of transmitting and receiving data at a transmission rate of bps and having a function of wirelessly communicating with the main device can access the ISDN by using the ISDN line interface in the main device. In particular, if the terminal itself incorporates the function of the wireless adapter as described above, the ISDN frame assembling / disassembling unit in the wireless adapter becomes unnecessary, and the application such as the video conference can be realized with a simpler configuration. Like <Modification 2> In the system according to the above embodiment, the low-speed frequency hopping method is used, but even when the direct spread method is used, the same effect as that of the above embodiment can be obtained. In 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 connection device 2, the wireless telephone 3, and the wireless adapter 4.

FIG. 43 is a diagram showing an example of a communication procedure when the direct spreading method is used, and the communication is divided into a main unit transmission frame and a slave unit transmission frame on the time axis (t). That is, the main device transmission frame and the slave device transmission frame are alternately transmitted.

FIG. 44 shows an example of the main unit transmission frame. The main device transmission frame here has control information and data slots for each wireless terminal. In the figure, FSYN
Is a synchronization signal, Ck (k = 1, 2 ... n) is control information from the main device to the wireless terminal k, Tk is transmission data for it, and GT is a guard time.

Further, FIG. 45 shows an example of the slave unit transmission frame. Each wireless terminal sends out control information and data in a certain time slot assigned in the slave device transmission frame. In the figure, FSYN is a synchronization signal, GT is a guard time, Ck is control information for the main device of the wireless terminal k, and Tk is transmission data for it.

Here, each transmission data is accompanied by a control signal preceding it, and the receiving device establishes communication by determining which connection device or wireless terminal the transmission data is to. In this wireless switching system, extension communication and communication with an external line are performed, but control of establishing a communication path is performed by the main device, and the main device manages the state of each wireless terminal and all communications.

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

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 of being implemented by supplying a program to a system or an apparatus. In this case, the storage medium storing the program according to the present invention constitutes the present invention. Then, by reading the program from the storage medium into the system or device, the system or device operates in a predetermined manner.

[0169]

As described above, according to the present invention,
When the control station that manages the frequency hopping pattern does not respond to the inquiry about the usage status of the hopping pattern from the controlled station, the hopping pattern is assigned to other communication as unused and wireless communication is disabled. Even if a terminal occurs, the hopping pattern assigned to the terminal can be effectively used.

[0170]

[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 system configuration and a main device configuration according to the 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 power of the main device (connecting device) and the wireless terminal is turned 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] Fig. 20 is a diagram illustrating a format example of an LCCH unit indicating information on an idle control channel.

[Fig. 21] Fig. 21 is a diagram illustrating a format example of an LCCH unit indicating information on an idle control channel.

FIG. 22 is a sequence diagram of outside line transmission in the embodiment.

FIG. 23 is a flowchart showing the operation of the wireless telephone 3 when making an outside line call.

FIG. 24 is a flowchart showing an operation of the main device 1 when an outside line is transmitted.

FIG. 25 is a sequence diagram of an external line incoming call in the embodiment.

FIG. 26 is a flowchart showing an operation of the main device when an outside line is received.

FIG. 27 is a flow chart showing an operation of the wireless telephone when an outside line is received.

FIG. 28 is a sequence diagram showing a data flow of the main device, the connection device, the calling side dedicated telephone, and the called side dedicated telephone during the extension communication.

FIG. 29 is a flowchart showing an outline process in the main device during an extension call.

FIG. 30 is a flowchart showing an outline process in the calling-side dedicated telephone.

FIG. 31 is a flow chart showing an outline process in a called-side dedicated telephone.

FIG. 32 is a diagram showing the structure of a hopping pattern use confirmation frame.

FIG. 33 is a diagram showing the structure of a hopping pattern use response frame.

FIG. 34 is a diagram showing a structure of an HP release request frame in an LCCH-T frame.

FIG. 35 is a diagram showing the structure of an HP release response frame in an LCCH-R frame.

FIG. 36 is a flowchart showing an HP use confirmation processing procedure in the control station according to the present embodiment.

FIG. 37 is a flowchart showing an HP usage confirmation processing procedure in the control station according to the present embodiment.

FIG. 38 is a flowchart showing an HP usage confirmation processing procedure in the controlled station according to the present embodiment.

FIG. 39 is a flowchart showing an HP usage confirmation processing procedure in the controlled station according to the present embodiment.

FIG. 40 is a diagram showing a sequence of HP usage confirmation processing.

FIG. 41 is a block diagram showing a configuration of a wireless adapter for ISDN according to a modification.

FIG. 42 is a diagram showing the structure of a data communication frame between an ISDN terminal and a main device.

[Fig. 43] Fig. 43 is a diagram for describing a direct diffusion communication procedure.

FIG. 44 is a diagram showing an example of a main device transmission frame.

FIG. 45 is a diagram showing an example of a slave unit transmission frame.

FIG. 46 is a block diagram showing a configuration of a conventional wireless switching system and a configuration of a main device thereof.

FIG. 47 is a connection device J in the conventional wireless switching system.
2 is a block diagram showing a configuration of FIG.

FIG. 48 is a block diagram showing a configuration of a wireless dedicated telephone J3 housed in a conventional wireless exchange system.

FIG. 49 is an operation sequence diagram of a conventional wireless switching system.

[Explanation of symbols]

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

Claims (7)

[Claims] 1. Radio communication in which spectrum spreading is performed by frequency hopping according to a predetermined hopping pattern, and a plurality of radio frames are multiplexed and communicated between a control station managing the hopping pattern and a plurality of controlled stations. In the system, means for inquiring the usage status of the hopping pattern from the control station to the controlled station at a predetermined cycle, judgment means for judging whether or not there is a response to the inquiry, and if there is no response by the judgment means If determined, the hopping pattern is determined to be unused, and the hopping pattern determined to be unused is assigned to another communication and used. 2. The radio according to claim 1, wherein the control station requests the controlled station using the hopping pattern determined to be unused to release the hopping pattern. Communications system. 3. The wireless communication system according to claim 2, wherein the controlled station that releases the hopping pattern notifies the user of the controlled station of a communication abnormality. 4. When the inquiry is made, if it is recognized that the controlled station is talking on the phone or has made a phone call within a predetermined time, the judgment by the judging means is omitted. The wireless communication system according to Item 1. 5. The spread spectrum by frequency hopping, wherein the control station uses a logical control channel to notify the controlled station of a hopping pattern of a channel related to the communication. The described wireless communication system. 6. The I functioning as the controlled station.
An adapter means for accommodating an SDN (Integrated Services Digital Network) terminal is provided, and the adapter means, among the data from the ISDN terminal,
The wireless communication system according to claim 1, wherein the wireless frame is generated by adding predetermined data to the B channel data and the D channel data. 7. The adapter means further analyzes the content of the D channel data, and converts the information obtained by the analysis into a communication protocol between the control station and the adapter means. 7. The wireless communication system according to claim 6, comprising means and means for converting the D channel data according to the communication protocol.