JPH09294292A - Radio exchange system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent interference or the like between systems by using the spread spectrum radio system for the radio system and employing the low speed frequency hopping system for the spread system. SOLUTION: This system has a master set 101 that contains public channels 102 and includes an exchange function and a radio connection function, a plurality of radio exclusive telephone sets 103A,103B making communication of control data and voice data with the master set 101, and radio data terminals 104A-104G which make communication of control data with the master set 101 and make direct data communication between them. A connection device 105 controls the terminals 104A-104G under the control of the master set 101 to contain the telephone sets 103A, 103B and the terminals 104A-104G and sets up radio channels. Then the telephone sets 103A, 103B and the terminals 104A-104G are freely communicated among the respective sets and terminals and accessible to a public network.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication network, and more particularly to a switching system for providing a wireless terminal to be connected with a public line and a switching function.

[0002]

2. Description of the Related Art In recent years, wireless communication has rapidly progressed and has been used in various fields. A telephone exchange device (including a key telephone device) is no exception, and a system for wirelessly communicating between a main device having an exchange function and a wireless telephone has been put to practical use.

Hereinafter, a conventional wireless telephone exchange will be described.

(System Configuration) FIG. 30 is a block diagram showing a configuration of a conventional system and a main device.

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

[0006] The wireless telephone 9003 is a terminal for making a call with an external line accommodated in the main device 9001 via the connection device 9002 and for making an extension call.
The PSTN line 9005 is an external line from a PSTN (existing public network) 9004 which is one of the external networks accommodated in the main device 9001, and the SLT (single telephone) 9006 is one of the terminals accommodated in the main device 9001. is there.

With the above configuration, the wireless telephone can perform voice communication with the telephone connected to the public line. In addition, extension communication can be performed between the wireless-only telephones in the system via the main device.

(Structure of Main Device) The internal structure of the main device 9001 will be described below. The CPU 9101 is the center of the main device 9001 and controls the entire main device including exchange control. The ROM 9102 is the CPU 910.
The control program No. 1 is stored. RAM9
Reference numeral 103 stores various data for controlling the CPU 9101 and provides a work area for various calculations.

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

The telephone unit 9107 has a handset, a dial key, a call circuit, a display, etc., and functions as an extension multifunction telephone when energized and as an SLT when a power failure occurs.
The tone sending circuit 9108 sends various tones such as a PB signal, a dial tone, and a ring tone. Connection device i / f9
Reference numeral 109 denotes a connection device 900 under the control of the CPU 9101.
It is an interface for accommodating 2.

(Configuration of Connecting Device) FIG. 31 is a block diagram showing the configuration of the connecting device 9002 in the conventional system.

The CPU 9201 is the center of the connection device 9002, and controls the entire connection device 9002 including the control of the communication channel and the radio section. ROM 920
The reference numeral 2 stores a control program for the CPU 9201, and the EEPROM 9203 stores a call code (system ID) for identifying a device belonging to the present switching system. RAM9204 is
It stores various data for controlling the CPU 9201 and provides a work area for various calculations.

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

The PCM codec 9206 has a CPU 92.
Under the control of 01, the PCM-coded call command from the main unit i / f 9205 is converted into an analog voice command and is passed to a voice processing LSI 9207 described later, and the analog voice command from the voice processing LSI 9207 is converted into P
It is for converting into a CM code and passing it to the main unit i / f 9205.

The voice processing LSI 9207 has a CPU 920.
Under the control of 1, when a demodulation command from the wireless unit 9208 described later is received and the received command is control data,
When A / D conversion is performed and output to the CPU 9201, the received command is a voice command, processing such as descrambling and decompression is performed and output to the PCM codec 9206, and the control data transmitted from the CPU 9201 is D / D converted. A-converts and transmits to the wireless unit 9208 to scramble the voice command from the PCM codec 9206,
Processing such as compression is performed and the result is transmitted to the wireless unit 9208.

Under the control of the CPU 9201, the radio section 9208 modulates the control data and the voice command from the voice processing LSI 9207 described above and processes them so that they can be transmitted by radio, and transmits them to the radio dedicated telephone 9003. A command received from the telephone 9003 from the wireless telephone is demodulated, control data and a voice command are extracted and transmitted to the voice processing LSI 9207.

(Configuration of Radio Dedicated Telephone) FIG. 32 is a block diagram showing the configuration of a radio dedicated telephone 9003 in the conventional system.

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

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

The voice processing LSI 9306 has a CPU 930.
Under the control of 1, the demodulation command from the radio unit 9307 is received, and if the received command is control data, A / D
If the received signal is a voice command, it is descrambled, decompressed, etc. and output to the call circuit 9305.
The control data transmitted from the 9301 is D / A converted and transmitted to the wireless unit 9307, and the voice command from the communication circuit 9305 is scrambled, compressed, and the like.
It is transmitted to 307.

Under the control of the CPU 9301, the radio unit 9307 modulates the control data and the voice command from the voice processing LSI 9306 described above to process them in a wirelessly transmittable state, and transmits them to the wireless connection device 9002.
A command wirelessly received from the wireless connection device 9002 is demodulated, control data and a voice command are extracted and transmitted to the voice processing LSI 9306.

The handset 9308 is for inputting / outputting a voice signal for talking, and the microphone 9309 is for collecting and inputting a voice signal. Also, the speaker 931
0 is for outputting a voice signal in a loud voice, and the display unit 93
Reference numeral 11 denotes a dial number input from the key matrix 9312, the use status of an outside line, and the like. Further, the key matrix 9312 includes dial keys for inputting dial numbers and the like, and function keys such as an outside line key, a hold key, and a speaker key.

(Description of Operation of Conventional System) Next, the basic operation of the conventional wireless switching system will be described.
FIG. 33 is an explanatory diagram showing a conventional operation sequence.

First, when a call is requested from the wireless-only telephone, the wireless-only telephone 9003 transmits a connection notification command (9401) to the connection device 9002 on a predetermined wireless control channel. The connection device that has received this connection notification command (9401) checks the usage status of the wireless communication channel, and if there is an available communication channel, sends a connection response command (9402) to the wireless telephone 9003.

Upon receiving the connection response command (9402), the wireless telephone 9003 switches the frequency used from the wireless control channel to the wireless communication channel and transmits the channel movement notification command (9403) to the connection device. After that, commands are transmitted and received on the call channel.

The connection device 9002 which received the command
Confirms the shift to the call channel and sends a channel move response command (9404) to the wireless telephone. Subsequently, the connection adapter 9002 transmits a line connection notification (9405) to the main device 9001.

Upon receiving the channel movement response command (9405) and confirming the establishment of the wireless line, the wireless telephone 9003 transmits the outside line transmission command (9406) to the connection device. Upon receiving the outside line transmission command (9406), the connection device sends outside line transmission (940) to the main device.
7) is transmitted. Thereafter, the main unit performs an outgoing call operation to an outside line, and shifts to a call when the other party answers (9412).

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

For wireless communication between the wireless-only telephone and the main unit of such a system, a wireless transmission system widely used in low-power analog cordless telephones has been used. That is, the modulation system is FM modulation, which uses two control channels and 87 voice communication channels.

In this system, communication is possible only point-to-point, and an extension wireless terminal requires a connection device for the extension wireless terminal in order to communicate with the main unit.

At the start of communication, first, the control channel is used to determine the voice communication channel to be used. After deciding which call channel to use, move to that channel,
After that, the call will be continued using that channel.

[0032]

However, in the above conventional example, since the narrow band FM is used as the radio modulation system, there are the following problems.

That is, when the narrow band FM is used, since the data transmission rate is about 2400 bps, there is no problem in the communication of the media represented by the voice data, which is not so required.

However, like a wireless LAN system,
Assuming that the exchange system supports a group of terminals that communicate such as character data, images, and video communication,
In a narrow band FM, there are problems that the transmission speed is low, it takes time for file transfer, and the real-time property of video is lost. Therefore, it is possible to accommodate a voice network and a data communication network in the same system. It was difficult and most systems were separate systems.

Therefore, a situation occurs in which two systems of wireless systems coexist in the office, and problems such as interference between systems occur.

An object of the present invention is to provide a wireless switching system which can prevent interference between systems.

[0037]

SUMMARY OF THE INVENTION In the present invention, the advantages of the digital wireless communication system are effectively utilized in a wireless switching system.

In recent years, spread spectrum communication has attracted particular attention among digital wireless communication systems. Spread spectrum communication is known to have high interference removal capability and excellent confidentiality by spreading the information to be transmitted over a wide band. Frequencies in the 2.4 GHz band have been allocated for spread spectrum communication in various countries around the world, and are spreading around the world.

Spread spectrum communication systems are roughly classified into direct spread (DS system) and frequency hopping (FH system).

In the direct spread method, the carrier wave that has been first-order modulated by PSK, FM, AM, etc. is second-order modulated by multiplying it by a spread code that is wider than the transmission data. Since the spectrum of the command after the spread modulation is wider than the spectrum of the command after the primary modulation, the power density per unit frequency is remarkably reduced, and interference with other communications can be avoided.

Further, by using a plurality of spreading codes described above, it becomes possible to provide a plurality of communication channels.

On the other hand, the frequency hopping system divides the 26 MHz band, which is licensed for use in spread spectrum radio in Japan, into a plurality of frequency channels having a width of about 1 MHz, and has a frequency channel to be used every unit time. In this method, transmission data is spread over a wide band by switching in a predetermined order (pattern).

By using a plurality of frequency switching patterns (hopping patterns), a plurality of communication channels can be provided as in the case of the direct spread system.

In particular, the low-speed frequency hopping modulation system is
Since it has a great advantage that the circuit scale of a frequency synthesizer or the like can be reduced, it has been actively used.

Further, by using a pattern in which adjacent frequency channels are not used in the same unit time, it is possible to minimize the occurrence of data error due to interference or the like.

The following effects can be obtained by constructing a wireless switching system using the above spread spectrum wireless and using the means described in each claim.

First, according to claim 1 of the present invention, the basic transmission capacity of the wireless switching system can be improved. Further, according to claim 2, the confidentiality and noise resistance of the wireless switching system can be improved.

Further, according to claim 3, it is possible to provide a plurality of communication services. Moreover, claim 4 makes it possible to assemble and / or disassemble a plurality of radio transmission frames required to obtain the operation according to claim 3. Further, according to claim 5, it is possible to select the wireless transmission frame according to claim 4 corresponding to the communication service according to claim 3.

Further, according to claim 6, it is possible to obtain the action of claim 4 without notifying the communicating terminal of the type of the wireless transmission frame according to claim 4 in advance.
Further, according to claim 7, it is possible to obtain simultaneously the actions obtained from the plurality of communication services described in claim 3 and the plurality of wireless transmission frames described in claim 4.

In addition, claim 8 shows an example of a terminal that can enjoy the communication service described in claim 3, and claim 9
Then, an example of data types communicable with the communication service according to claim 3 is shown.

[0051]

BEST MODE FOR CARRYING OUT THE INVENTION The first embodiment of the present invention will be described below.
In the embodiments, a case where digital radio communication by a frequency hopping method is used for a switching system and various data communication is also available in the system will be sequentially described in detail.

(System Configuration) FIG. 1 is an explanatory diagram showing the configuration of the system assumed in this embodiment.

This system accommodates the public line 102,
A main device 101 having an exchange function and a wireless connection function,
A plurality of wireless dedicated telephones 103A, 103B for communicating control data and voice data with the main device 101.
And wireless data terminals 104A to 10A for performing control data communication with the main device and direct data communication between the terminals.
4G and configured.

In the following description, the wireless dedicated terminal and the wireless data terminal are collectively referred to as a wireless terminal.
In addition, the wireless data terminal in this embodiment connects 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. It refers to the ones that have been made or integrated. The data terminals include computers 104A and 104B, printers 104G, and
Various terminals such as a copying machine 104C, a multimedia terminal 104D, a facsimile 104E, a LAN bridge 104F, an electronic camera, a video camera, and a scanner that perform data processing are applicable.

The connection unit 105 controls the wireless terminal under the control of the main unit and establishes the wireless transmission path so that the wireless dedicated telephone and the wireless data terminal can be accommodated in the system. In addition, SLT (single telephone) 106
Is one of the terminals accommodated in the main device 1.

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

(Internal Structure) (1) Main Unit First, the structure of the main unit for accommodating the public line will be described.

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

First, the main control unit (CPU) 201 is the center of the main unit 1 and controls the entire main unit including the exchange control. The memory 202 includes a ROM that stores a control program for the CPU 201, and the CPU 201.
It includes a RAM for storing various data for controlling the above and providing a work area for various calculations.

Further, the connecting device i / f 203 is the CPU 2
Under the control of 01, it is an interface for transmitting and receiving information to and from the connection device 2 in order to accommodate the connection device 105. The call path unit 204 is under the control of the CPU 201.
It is responsible for call exchange (time division exchange). Also, PS
Under the control of the CPU 201, the TN line i / f 205
This is an interface for PSTN line control such as incoming call detection for accommodating STN lines, transmission of selection commands, and DC loop closure.

The ISDN line i / f 206 is connected to the CPU 20.
ISDN for accommodating an ISDN line under control of 1
This is an interface that supports layer 1 and layer 2 of the above and performs ISDN line control, PCM conversion, and the like.

The STLi / f 207 is an interface that performs power supply for accommodating the STL 106, loop detection, selection command reception, call command transmission, PCM conversion, and the like.

The wireless telephone unit 208 has a handset, a dial key, a call circuit, a display, etc., and is CP when energized.
Under the control of U201, it functions as an extension wireless telephone and functions as an SLT when a power failure occurs. The tone sending circuit 209 sends various tones such as a PB signal, a dial tone, and a ring tone.

(2) Connection Device FIG. 3 is a block diagram showing the configuration of the connection device 105.

The main controller (CPU) 301 is the connection device 1
It is the center of 05 and controls the whole connection device 105 including the control of the communication channel and the control of the radio section. The memory 302 stores a ROM storing a control program of the CPU 301, an EEPROM storing a call code (system ID) of the exchange system, and various data for controlling the CPU 301, and a work area for various calculations. It includes the provided RAM.

The main device i / f 303 is an interface for transmitting / receiving information to / from the connection device i / f of the main device 1 under the control of the CPU 301. PCM / ADPCM conversion unit 304
Is a PC from the main device 101 under the control of the CPU 301.
The M-coded information is converted into an ADPCM code and transferred to the frame processing unit 305, and at the same time, the frame processing unit 3
The ADPCM coded information from 05 is converted into a PCM code and transferred to the main device 101.

The frame processing unit 305 performs processing such as scrambling on the ADPCM encoded information, and
The frame processing unit 305 transmits the data assembled into frames as shown in FIGS. 7 and 8 to a main device or a target wireless terminal via a wireless unit. Will be done.

The radio control section 306 controls the transmission / reception switching, frequency switching, etc. of the radio section 307, and has the functions of carrier detection, level detection, and bit synchronization.

The radio section 307 modulates the framed digital information from the frame processing section 305, processes it so that it can be transmitted by radio, and transmits it to the antenna.
The information received wirelessly from the antenna is demodulated and processed into framed digital information.

(3) Radio Dedicated Telephone FIG. 4 is a block diagram showing the configuration of the radio dedicated telephone 103.

The main control unit (CPU) 401 is the center of the wireless-only telephone 103, and controls the entire wireless-only telephone 103, including wireless unit control and call control. The memory 402 is a control program for the CPU 401. ROM in which is stored, the calling code of this exchange system (system I
D), EEPRO that stores the sub-ID of the wireless telephone
RAM for storing various data for controlling M and CPU 401 and providing a work area for various calculations
Is included.

The call path unit 403 includes the input / output blocks of the handset 408, the microphone 409, and the speaker 410 and the ADPC.
The interface of the M codec 404 is performed, and the ADPCM codec 404 converts the analog voice information from the communication path unit 403 into an ADPCM code and also converts the ADPCM coded information into analog voice information.

The frame processing unit 405 performs processing such as scrambling on the ADPCM encoded information, and
This is time division multiplexing into a predetermined frame, and the data assembled into frames as shown in FIG. 7 and FIG. 8 by the frame processing unit 405 is transmitted to the main device and the target wireless terminal via the wireless unit. Will be done.

The radio control section 406 has a function of controlling transmission / reception switching, frequency switching, etc. of the radio section 407, and also carrying out carrier detection, level detection and bit synchronization.

The radio section 407 modulates the framed digital information from the frame processing section 405, processes it so that it can be transmitted by radio, and transmits it to the antenna.
The information received wirelessly from the antenna is demodulated and processed into framed digital information.

The handset 408 is for inputting / outputting a call voice signal, and the microphone 409 is for collecting and inputting a voice signal. The speaker 410 outputs a voice signal in a loud voice, and the display unit 412 displays a dial number input from a key matrix to be described later and a usage state of an outside line.

The key matrix 411 is composed of dial keys for inputting dial numbers and the like, and function keys such as an outside line key, a hold key, and a speaker key.

(4) Wireless Adapter FIG. 5 is a block diagram showing the internal structure of the wireless data terminal 104.

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

The radio section 503 of the radio adapter 502 exchanges radio signals with the radio section of the connection device or another radio adapter.

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

The memory 505 is composed of a ROM for storing a program used by the main control unit 504, a RAM used as a buffer area for various processes, and the like.

The communication i / f unit 506 is a communication i / f that is standard equipment of a data terminal device such as the above-mentioned data terminal 501, for example, RS232C, Centronics, LA.
Communication i / f such as N, internal bus of personal computer or workstation, for example, ISA bus, PCM
CIAi / f and the like correspond.

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

The frame processing unit 508 performs frame processing, and the data assembled into frames as shown in FIGS. 7 and 8 by the frame processing unit 508 is used as a main device or a target via the wireless unit. It will be transmitted to the wireless terminal.

The radio control unit 509 has a function of controlling transmission / reception switching, frequency switching, etc. of the radio unit 503, and has a function of carrying out carrier detection, level detection, and bit synchronization.

The error correction processing unit 510 is used to reduce bit errors occurring in data by wireless communication. At the time of transmission, an error correction code is inserted in the communication data. Further, at the time of reception, an error position and an error pattern are calculated by arithmetic processing, and a bit error in the received data is corrected.

The timer 511 provides a timing signal used by each block inside the wireless adapter.

(5) Radio Unit FIG. 6 is a block diagram showing a radio unit having a common configuration for the main unit, the radio dedicated telephone, and the data terminal of this system.

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

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

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

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

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

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

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

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

(6) Radio Frame FIGS. 7 (1) to (3) and FIGS. 8 (1) to (4) are explanatory views showing a radio frame configuration used in the present radio switching system.

In this wireless switching system, a communication frame between the main unit and the wireless dedicated telephone (hereinafter referred to as PCF), a communication frame between the wireless dedicated telephone (hereinafter referred to as PPF), and burst data are classified according to the communication service provided by the main unit. Three types of frames (hereinafter referred to as BDF) are used.

Each frame is largely divided into a control section and a data section, and the frequency channel to be used is different when the control section is exchanged and when the data section is exchanged.

The control units are FSYN, LCCH-T, LC
It is composed of each field of CH-R and is used for transmitting a control command exchanged between the main device and the wireless terminal. The frequency channel used for exchanging the control unit is fixed for each wireless terminal (hereinafter, this frequency channel is generically referred to as a control frequency channel). Since the main device circulates each frequency channel according to a certain hopping pattern, it becomes possible to exchange control commands with all wireless terminals.

On the other hand, regarding the data part, the frequency channel to be used differs for each frame type. First, PCF
In this case, the frequency channel used is the same as the frequency channel used by the control unit. Also, PPF and BD
In the case of F, the frequency channel used follows the hopping pattern assigned by the main unit using the control unit.

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

FIG. 7 (1) shows a PCF (communication frame between main device and wireless dedicated telephone). This PCF is
It is used for communication between the main unit and the wireless telephone, and
It consists of two types of fields.

First, the FSYN field stores the synchronization command, the LCCH-T field stores the control command sent by the main unit to the wireless dedicated telephone, and the LCCH-R field stores the control command sent by the wireless dedicated telephone to the main unit. To do.

T1, T2, T3 and T4 are voice fields sent by the main unit to the wireless dedicated telephone, and R1, R2, R3 and R4 are voice fields sent by the wireless dedicated telephone to the main unit.

As shown in the figure, the PCF has four voice fields, which allows up to four wireless telephones to exchange voice data with the main unit (that is, a telephone connected to the public line).

Further, the GT field represents a guard time for frequency switching and the like.

FIG. 7B shows a PPF (communication frame between wireless dedicated telephones). This PPF is used for communication between a plurality of wireless dedicated telephones and is composed of the following 12 types of fields.

First, the FSYN field stores the synchronization command, the LCCH-T field stores the control command sent by the main unit to the wireless dedicated telephone, and the LCCH-R field stores the control command sent by the wireless dedicated telephone to the main unit. To do.

[0111] T1, T2, and T3 are voice fields sent from the calling-side wireless dedicated telephone to the called-side wireless dedicated telephone, and R1, R2, and R3 are conversely called by the called-side wireless dedicated telephone. This is a voice field to be sent to the call-side wireless telephone.

As shown in the figure, the PPF has three voice fields, which allows up to six wireless telephones to exchange voice data with each other.

Further, the GT field represents a guard time for frequency switching and the like.

Further, in FIG. 7B, the control section and the data section use different frequency channels even in the same frame. That is, since communication is performed between two wireless-only telephones, a hopping pattern and an audio field number are stored from the main device in the control frequency channel.
The wireless telephone receiving the CCH-T field switches the frequency part according to the specified hopping pattern in the data part and exchanges the data part.

FIG. 7C shows a BDF (burst data frame). This BDF is used for communication between wireless terminals such as a plurality of wireless data terminals, and is composed of the following eight types of fields.

First, the FSYN field stores the synchronization command, the LCCH-T field stores the control command sent by the main unit to the wireless dedicated telephone, and the LCCH-R field stores the control command sent by the wireless dedicated telephone to the main unit. To do.

Regarding the data part, the above-mentioned PCF, P
Unlike PF, it is continuous without being divided into fields.

Further, R represents the time of carrier sense for confirming that the previous frame has ended, and for confirming whether another wireless device is emitting a radio wave.
Represents a preamble field. DATA represents a data field for accommodating burst data, and GT
Indicates guard time.

Further, in FIG. 7 (3), the control section and the data section use different frequency channels even in the same frame. That is, since communication is performed between two wireless data terminals, the main device stores the hopping pattern and the voice field number in the control frequency channel.
Upon receiving the CCH-T field, the wireless data terminal switches to a frequency channel according to a specified hopping pattern in the data section and exchanges the data section.

Next, each field that constitutes the three frames will be described.

FIG. 8 (1) shows the internal structure of the FSYN field. The FSYN field is composed of 6 subfields.

First, the PR stores a 62-bit preamble for frequency synchronization acquisition defined by the Radio Wave System Development Center (hereinafter referred to as RCR), and the SYN stores a 31-bit frame synchronization command (RCR definition). The ID is a 63-bit call command (RC
R definition), and FI stores a command for distinguishing PCF / PPF / BDF by a 2-bit frame type command. Further, TS stores time information and NFR stores frequency channel information of the next frame.

FIG. 8 (2) shows the internal structure of the audio field. Two types of audio fields of Tn and Rn (n represents a channel number from 1 to 4) are composed of 6 subfields.

First, R is used to confirm that the previous frame has ended, and to confirm whether another wireless device is emitting radio waves.

Further, PR1 stores the preamble for each slot, and UW stores the unique word including the sub ID. D stores D channel information having a transmission rate of 3.2 kbps, and B stores B channel information having a transmission rate of 32 kbps. Furthermore, GT is a guard time.

FIG. 8 (3) shows the internal structure of the LCCH-T field. The LCCH-T field is used to store a control command sent from the main device to the wireless terminal, and is composed of the following three subfields. The frequency channel on which the main unit transmits this LCCH-T field depends on the hopping pattern used by the main unit.

In FIG. 8 (3), first, UW is a sub-I.
The unique word containing D is stored, and the LCCH stores the control command. GT is a guard time. The LCCH-T field does not include the preamble, but this is because the preamble in FSYN can be substituted.

FIG. 8 (4) shows the internal structure of the LCCH-R field. This LCCH-R field is used to store a control command sent from the wireless terminal to the main device, and is composed of the following five subfields. The frequency channel in which the wireless terminal transmits this LCCH-R field is allocated by the main device to each wireless terminal in the setting mode.

In FIG. 8 (4), first, R is used to confirm that the previous frame has ended, and to confirm whether another wireless device is emitting radio waves. Also, PR1 stores the preamble for each slot, and U
W stores a unique word including sub ID, LCCH
Stores the control command. GT is a guard time.

(7) Operation of Frame Processing Unit The above three types of frames are processed by the frame processing unit. FIG. 9 is a block diagram showing the internal configuration of the frame processing unit.

The main control unit (CPU) 801 controls the timing of each internal block, and the data register 802 temporarily holds voice or data information input during transmission. 803
Is for temporarily holding information input from the reception frame processing unit 810 at the time of reception.

The LCCH setting section 804 is shown in FIG.
The externally input LCCH-T and LCCH subfields inside the R field shown in (4) are incorporated in the frame.

The frame type setting unit 805 incorporates the FI subfield inside the FSYN field shown in FIG. 8A, which is externally input, into the frame. The call command setting unit 806 receives the externally input F shown in FIG.
The ID subfield inside the SYN field is incorporated into the frame.

The unique word setting unit 807 incorporates into the frame the UW subfields in the fields shown in FIGS. 8 (1) to 8 (3) that are externally input. The time slot setting unit 808 inputs the FS shown in FIG.
The TS subfield inside the YN field is embedded in the frame. The frequency information setting unit 809 incorporates the NFR subfield inside the FSYN field shown in FIG. 8A, which is externally input, into the frame.

Preamble processing section 810 automatically incorporates the PR or PR1 subfield of each field shown in FIGS. 7 and 8 into a frame at the time of transmission. Also, at the time of reception, the PR or PR1 subfield is automatically deleted from the frame output from the reception frame processing unit 813.

The guard time processing unit 811 automatically incorporates the GT subfield of each field shown in FIGS. 7 and 8 into a frame at the time of transmission. Further, at the time of reception, the GT output from the frame output from the reception frame processing unit 813
The subfield is automatically deleted.

The transmission frame processing section 812 has a main control section 8
The information output from each block is output to the wireless unit in synchronization with the timing control from 01. Received frame processing unit 81
3 receives the frame transmitted from the wireless unit in synchronization with the timing control from the main control unit 801, and outputs it to each internal block.

The basic operation of this frame processing section will be described below.

(7-1) Frame Reception The external CPU which controls the entire frame processing unit from the outside,
The control command information is sent to the LCCH setting unit 804, the type of the frame to be sent is sent to the frame type setting unit 805, the calling code corresponding to the destination is called, the unique word is sent to the unique word setting unit 807, and the voice sub to be used. If the field number has been decided,
The audio subfield number is set to the time slot setting unit 808.
First, the frequency channel information such as the frequency channel to be used and the hopping pattern is set in the frequency information setting unit 809. After that, the information to be transmitted is written in the data register 802.

The main controller 801 time-divisionally controls each block based on the above-described information so that the frame structure corresponds to the frame type set in the frame type setting unit 805, and the transmission frame processing is performed. The data is sent to the unit 813.

The transmission frame processing section 813 has a main control section 8
The data transmitted in synchronization with the timing information supplied from 01 is continuously output to the wireless unit.

Further, the transmission frame processing section 813 scrambles the frame in order to maintain DC balance during wireless transmission.

(7-2) Frame Reception The reception frame processing unit 812 receives the reception frame from the radio unit in synchronization with the timing information from the main control unit 801, and performs the descrambling process on the frame and then the frame processing unit. Output the frame internally.

The main control section 801 has a reception frame processing section 8
F in the FSYN field of the frame output by 12
The I subfield is read to determine the frame type.

Then, the main control section 801 deletes the preamble and guard time subfield corresponding to each frame, and passes the frame to the data register section 803.

(Basic Operation) (1) Frequency Switching FIG. 10 is an explanatory diagram showing the concept of frequency switching used in the wireless switching system of this embodiment.

In the wireless switching system of this embodiment, the 26 MHz frequency band licensed for use in spread spectrum wireless in Japan is divided into 26 frequency channels of 1 MHz width for use.

The main device and the wireless terminal perform communication while switching the 26 frequency channels in a predetermined order (hopping pattern) at regular intervals.

26 kinds of hopping patterns can be used, and it is possible to take a pattern in which frequencies used in the same unit time do not overlap. That is, one hopping pattern can be considered to form one communication channel, and up to 26 communication can be simultaneously supported.

When there are a plurality of connecting devices connected to the main device, in order to prevent radio wave interference between the connecting devices,
The use of different hopping patterns for each connection device is also a feature of this system.

By this method, a system having a multi-cell structure can be realized and a wide service area can be obtained.

FIG. 11 is an explanatory diagram showing an example of frequency switching.

Further, in this wireless switching system, 1
It is assumed that it takes 5 ms to send and receive a communication frame. In the case of PCF, the frequency channel is switched once for each frame, similarly for PPF and BDF.
In this case, the frequency channel is switched once or twice for each frame.

For example, as shown in FIG. 11, consider a case where the wireless telephones A to F are operating under the control of the main unit. Then, in FIG. 11, the wireless telephones D, E
Is assumed to be communicating.

The main device transmits the PCF in accordance with a specific hopping pattern (here, as an example, the order is f1, f2, f3, ...).

In order to receive the control of the main device, each radio-only telephone must receive the control section in the PCF frame transmitted by the main device, that is, the FSYN and LCCH-T fields. Therefore, the frequency channel for that purpose is called a control frequency channel in particular, and the wireless telephone A uses f
2, B is assigned f3, C is assigned f4, and so on. The LCCH-R field from the wireless-only telephone also
It is transmitted on this control frequency channel.

As described above, different frequency channels are used in the data section of each frame. Then, in FIG. 11, the wireless telephones D and E switch the control frequency channels assigned to each of them when performing the communication of the data part, and the hopping pattern different from that of the main device (here, as an example, f26, f25, f24). ,
……) are used in this order. By this frequency channel switching processing, it becomes possible to provide a plurality of communication services at the same time.

(Detailed Operation) In the present wireless switching system, different frames are formed for each communication service and frequency channels to be used are set at regular time intervals during communication between the main device, the wireless dedicated telephone, and the wireless data terminal. Control to switch to.

The specific operation of the wireless switching system will be described below in some cases. In the detailed operation described below, the communication between the main device and the wireless terminal always goes through the connection device, but unless the connection device performs any processing or control related to this embodiment, The operation of the connection device is not described.

(1) Basic Operation Procedure The LCCH subfield of the LCCH-T and LCCH-R fields contains the radio terminal ID, control command, control command parameters, and the like. Therefore, this control command is used to notify the presence / absence of an incoming call to an outside line, a call request of a wireless telephone, a communication request between wireless data terminals, and the like.

The wireless terminal in the idle state waits for reception on the frequency channel (specified in the setting mode described later) specified by the main apparatus, and the LCCH- from the main apparatus is sent at regular intervals. Monitoring the T field.

Before making a call or data communication, each wireless terminal uses the frequency channel assigned to itself for the LCCH-T field sent from the main unit to use it for a call or data communication. You need to specify the voice field number and hopping pattern.

When the wireless terminal generates data to be transmitted to the main unit, the control command is transmitted to the main unit by using the LCCH-R field in the assigned frequency channel. Further, when it is desired to start communication using the voice field, the fact is notified to the main device using the LCCH-R field, and the voice field number and the hopping pattern are assigned. Then, after the allocation is made, it becomes possible to carry out a call and data transmission.

The detailed operation in some cases will be described below.

(2) Operation immediately after power-on The main device and wireless terminal immediately after power-on notify the system ID, register the wireless ID, and use LCCH-T, LC
The period during which the frequency channel of the CH-R field is determined is called the setting mode. The operation in this setting mode will be described below.

(2-1) Setting Mode of Main Device FIG. 12 is a sequence diagram showing the operation of the main device and the wireless terminal when the power is turned on, and FIG. 13 is a flowchart showing the operation of the main device when the power is turned on. Is.

Immediately after the power is turned on, the main device 101 performs internal initialization (S1201), determines a hopping pattern to be used in wireless communication (S1202), and then continues the hopping pattern (hopping in the next unit time). Frequency) and the FSYN and LCCH-T fields specifying the system ID of the wireless switching system are transmitted to the wireless terminal (S1203).

At this time, the system ID is stored in the ID field (FIG. 8 (1)) inside the FSYN, the frequency information for hopping in the next unit time is stored in the NFR field (FIG. 8 (1)), and the LCCH subfield (FIG. 8). In (3)), information on frequency channels usable on the wireless terminal side is set.

The main unit 101 receives the system ID from the wireless terminal.
If the wireless ID is received (S1204), the wireless ID of the wireless terminal not stored is stored, and FSY is performed with this wireless terminal.
A frequency channel for exchanging N and LCCH-T and LCCH-R fields is determined (S120
5), Notify the wireless terminal (S1206).

(2-2) Wireless Terminal Setting Mode FIG. 14 is a flowchart showing the operation when the power of the wireless terminal is turned on.

Immediately after the power is turned on, the wireless terminal performs internal initial setting (S1301) and then stores the wireless ID for the wireless terminal set by the user (S1302).

Next, in order to receive the LCCH-T field from the main unit, a reception standby state is set at an arbitrary frequency (S1303).

The wireless terminal sends FSYN and LC from the main unit.
If the CH-T field is received (S1304),
System ID from ID subfield (Fig. 8 (1))
The frequency for transmitting the LCCH-R field from the wireless terminal to the main device is read from the LCCH subfield (FIG. 8 (3)), and the frequency to be used for the next unit time is read from the NFR subfield (S1305) and stored. next,
After the reception frequency of the radio unit is moved to the frequency channel, reception is awaited.

The wireless terminal repeats such operation,
By following the frequency channel of the main device, the hopping pattern used by the main device is recognized and stored (S
1306).

Upon recognizing the hopping pattern and the system ID, the wireless terminal determines the LCCH.
The system channel and the wireless ID are transmitted to the main device in the LCCH-R field using the frequency channel designated by the main device in the subfield (S130).
7).

After that, when the frequency channel designation information is received from the main unit, the frequency channel is fixed to the designated frequency channel and the intermittent reception is started (S1308). This intermittent reception enables the wireless terminal to save the battery.

(3) Processing when an outside line arrives at the radio-only telephone FIG. 15 is a sequence diagram showing an operation when an outside line arrives, that is, when an incoming call is received from a public line connected to the main unit. The control commands exchanged between 101, the connection device 105, and the wireless telephones 103A and 103B are shown.

Further, FIG. 16 shows the main unit 10 when an external line is received.
3 is a flowchart showing the operation of No. 1. Note that, for convenience of explanation of operation, the wireless-only telephone is the FSY from the main device 101.
The frequency channel for receiving the N and LCCH-T fields and transmitting the LCCH-R field to the main unit 101 is f1 for the wireless-only telephone 103A and f2 for the wireless-only telephone 103B, as described above. To
This frequency channel is the main unit 101 in the setting mode.
It is assigned by and is not uniquely determined.

First, when there is an incoming call from the public line 102 (S1501), the main unit 101 makes the wireless dedicated telephone 103
External line incoming command (1403, 140
5) is transmitted (S1502).

For example, when the user of the wireless telephone 103A ringing by this outside line incoming command responds by off-hook (S1602), the wireless telephone 103
A sends an off-hook command to main device 101 (S
1603).

The main unit 101 uses the off-hook command (1
If 407) is received (S1503), the outside line response permission command (1408) including information such as the hopping pattern and voice channel number used for outside line communication is transmitted to the wireless telephone 103A (S150).
4).

When the communication setting completion command (1411) is received (S1505), the in-call display instruction command (1412) is transmitted to the wireless telephone 103A (S1).
Along with 506), the outside line incoming call termination command (1416) is transmitted to the other wireless dedicated telephone 103B (S1507).

Then, the communication path (1415) from the wireless telephone 103A is connected to the public line 102 to start a call (S1508). Further, the main unit 101 uses the on-hook command (141
The connection with the public line 102 is continued until 9) is received (S1509).

Off-hook command (1419)
When receiving the, the connection with the public line 102 is stopped,
Issue the communication setting cancel command (1421) (S151)
0). In addition, an outside line busy display stop command (1422) is transmitted to the other wireless dedicated telephone 103B (S15).
11).

Next, FIG. 17 is a flow chart showing the operation of the wireless telephone when an outside line is received.

The dedicated radiotelephones 103A and 103B are the main unit 1
When an outside line incoming command (1403, 1405) is received from 01 (S1601), an incoming call is sounded and off-hook is detected (S1602).

If the off-hook is detected in the wireless-only telephone 103A, the wireless-only telephone 103A
A sends an off-hook command (1406) to the main device 1 (S1603).

Next, when the wireless telephone 103A receives the outside line response permission command (1409) from the main unit 101 (S1604), it sets the audio subfield number in the frame processing unit 405 (S1605) and performs communication. A setting completion command (1410) is transmitted (S160
6).

When the in-call display command (1413) from the main unit 101 is received (S1607), the wireless telephone 103A displays a busy message on the display unit 413 (S1608), and the frame processing unit 405 displays the PCF. Settings are made (S1609) and the call is started (S161).
0).

Further, the wireless telephone 103A continues the call until it detects an on-hook (S1611), and if it detects an on-hook, it sends an on-hook command (141).
8) is transmitted to the main device 101 (S1612).

A communication setting cancel command (1421)
If the message is received (S1613), the wireless dedicated telephone 10
3A clears the setting of the frame processing unit 405, turns off the call display on the display unit 413, and ends the call.

Before the off-hook is detected (S
1602), if the outside line incoming stop command (1417) is sent to the wireless dedicated phone 103B because another wireless dedicated phone has started a call, the wireless dedicated phone 1
03B displays an outside line in use on the display unit 413 (S1).
615).

Further, the wireless telephone 103B receives the outside line busy display stop command (1423) until it receives the command.
The outside line in use display is continued on the display unit 413 (S1616),
When the command is received, the outside line busy display is erased (S1617).

(4) Call between wireless dedicated telephones Next, two telephones managed by the same connection device (that is, the connection device intervening when communicating with the main device 101 are the same) Assuming that the wireless-only telephones 103A and 103B carry out extension-to-extension communication, the operations of the calling-side wireless-only telephone 103A and the called-side wireless-only telephone 103B will be described.

FIG. 18 shows the main device 101 and the connection device 10.
5, wireless dedicated telephone 103A, and wireless dedicated telephone 1
It is a sequence diagram which shows the control command which 03B exchanges, respectively. Further, FIG. 19 is a flowchart showing the processing of the main device 101, and FIG.
It is a flowchart which shows the process of 03A. FIG.
1 is a flowchart showing the processing of the wireless telephone 103B.

For convenience of explanation of the operation, the wireless-only telephone receives the FSYN and LCCH-T fields from the main device 101 and transmits the LCCH-R field to the main device 101 by using a frequency channel. Although it is f1 in 103A and f2 in the wireless telephone 103B, as described above, this frequency channel is assigned from the main device 101 in the setting mode and is not uniquely determined.

First, when the extension key arranged in the key matrix 414 is depressed (S1901), the wireless telephone 103A receives the extension communication command (170) at f1.
2) is transmitted using the LCCH-R field (S1
902).

Upon receiving the extension communication command (1701), the CPU 201 in the main apparatus 101 stores communication resources such as hopping patterns and voice subfields (T1 to T4, R1 to R4) stored and managed in the RAM 203 by radio. The wireless dedicated telephone 10 is assigned to the dedicated telephone 103A, and this communication resource information is used as an extension communication permission command (1703) using the LCCH-T field.
It is transmitted to 3A (S1804).

When the connection device 105 receives the extension communication permission command (1703) from the main device 101, the connection device 105 sets a predetermined audio subfield number in the frame processing unit 307, and the main device 101 and the wireless dedicated telephone 103A.
It establishes a communication path with.

Upon receiving the extension communication permission command (1704) (S1903), the wireless telephone 103A sets the voice subfield number in the frame processing unit 405 to synchronize with the voice subfield (S190).
Along with 4), a hopping pattern is set (S19).
05).

Both control data and voice data thereafter are communicated using this voice channel. Specifically, FIG.
As shown in (2), the control data is the D subfield,
Audio data uses the B subfield.

When the audio subfield synchronization in the wireless telephone 103A is completed, the communication setting completion command (1706) is transmitted using the predetermined D subfield (S1906). Next, the wireless telephone 103A, which receives the dial information from the key matrix 414, transmits a dial command (1708) to the main device 101 (S).
1907).

The main unit 101 uses the dial command (17
07) is received (S1805), the wireless telephone 1
The extension incoming command (1709) is transmitted to the 03B using the LCCH-T field (S1806).

Receive the extension incoming command (1710) (S
The wireless telephone 103B that has performed 2001) notifies the operator of the incoming call using the speaker and prompts a response (S20).
02), wait for the user to respond with the key matrix 414.

When a response from the user is detected (S20)
03), the wireless telephone 103B sends an off-hook command (1712) to the connecting device using the LCCH-R field (S2004).

Upon receiving the off-hook command (1711) from the wireless dedicated telephone 103B (S1807), the main unit 101 uses the wireless dedicated telephone 103B for communication resource information such as hopping patterns and voice subfield numbers used for extension calls. The extension communication permission command (1713) including the message is transmitted (S1808).

Upon receiving the extension communication permission command (1714) (S2005), the wireless telephone 103B stops the ringing tone and outputs the voice subfield number (S2) obtained from the communication resource information in the extension communication permission command (1714).
006) and the hopping pattern (S2007) are set in the frame processing unit, and then a communication setting completion command (1716) is transmitted to the main device 101 (S2008).

The main unit 101 is a wireless dedicated telephone 103B.
When the communication setting completion command (1715) is received (S1809), the extension response command (1717) is sent to the wireless dedicated telephone 103A (S1810) to notify that the wireless dedicated telephone 103B has responded, and Dedicated telephone 103A and wireless dedicated telephone 103B
Determines that the call has started, and waits for an extension communication end command (S1811).

[0209] The wireless telephone 103A, which has confirmed the other party's response by the extension response command (1718), stops the ringback tone, switches to the assigned logical channel for communicating with the other party, and controls the microphone and speaker. , It becomes a call state with the other party. During a call, the wireless dedicated telephone 103A and the wireless dedicated telephone 103B
Is the wireless line status and the key matrix 41 of the user.
Monitor 4

When the call ends and the wireless telephone 103A detects the on-hook (S1911), the wireless telephone 103A transmits the on-hook command (1720) to the wireless telephone 103B (S1912).

On the other hand, the wireless telephone 103B which has received the on-hook command (1720) (S2011) transmits the on-hook confirmation command (1721) by the control information in the communication channel (S2012).

On-hook confirmation command (1721)
The wireless-dedicated telephone 103A that has received (S1913)
The communication channel is switched to the logical control channel, and the extension communication end command (1723) is transmitted to the connection device (S
1914).

Upon receiving the extension communication end command (1712), the main unit 101 transmits a communication setting cancel command (1724) to the wireless dedicated telephone 103A and the wireless dedicated telephone 103B (S1812).

Next, the main unit 101 is connected to the wireless-only telephone 10
Communication resources such as voice subfields and hopping patterns allocated to 3A and 103B are released (S1813).

Communication setting cancel command (1725, 172)
The wireless dedicated phones 103A and 103B that have received 7) (S1915, S2013) clear the communication settings.

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

(5) Data communication between wireless data terminals A feature of the wireless switching system of this embodiment is that high-speed data transmission between wireless data terminals is possible.

In this embodiment, two wireless data terminals (wireless data terminal 104) to which a wireless adapter is connected or built-in.
A process for performing burst data communication between A and the wireless data terminal 104B) will be described below.

FIG. 22 shows the main device 101 and the connection device 10.
5, wireless data terminal 104A, wireless data terminal 104B
FIG. 23 is a sequence diagram showing control commands exchanged between them, and FIG. 23 is a flowchart showing processing of the main device 101. 24 is a flowchart showing the processing of the wireless data terminal 104A, and FIG. 25 is a flowchart showing the processing of the wireless data terminal 104B.

For convenience of explanation of the operation, the wireless data terminal receives the FSYN and LCCH-T fields from the main apparatus 101 and uses the frequency channel for transmitting the LCCH-R field to the main apparatus 101 as the wireless data terminal. Although it is set to f5 in 104A and f7 in the wireless data terminal 104B, as described above, this frequency channel is assigned from the main device 101 in the setting mode and is not uniquely determined.

(Wireless Data Communication Preprocessing) First, when data to be transmitted is generated (S2301), the wireless data terminal 104A issues a communication request command (2102) to LCCH-.
It is transmitted to the main device 101 using the R field (S23).
02).

Upon receiving the data communication request command (2101) (S2201), the main unit 101 allocates communication resources such as hopping patterns to the wireless data terminal 104A (S2202), and uses this communication resource information as the LCCH.
-Communication setting command using T field (2103)
To the wireless data terminal 104A (S220)
3).

Upon receiving the communication setting command (2104) of the LCCH-T field (S2303), the wireless data terminal 104A sets the hopping pattern obtained from the communication resource information in the frame processing unit 508.

Then, when the communication environment setting in the wireless data terminal 104A is completed, the communication setting completion command (2108) is transmitted using the LCCH-R field (S).
2305).

Next, the wireless data terminal 104A that has received the wireless ID from the data terminal device transmits an address command (2110) to the main device 101 (S2306).

In the main unit 101, the address command (2
109) is received (S2204), the data receiving command is sent using the LCCH-T field of the control frequency channel used by the wireless terminal (in this case, the wireless data terminal 104G) having the wireless ID specified in the address command. (2111) is transmitted (S2205).

The wireless data terminal 104B, which has received the data incoming command (2112) (S2401), sends the data incoming response command (2114) to the main unit 101 using the LCCH-R field if the data incoming call can be received. (S2402).

Upon receiving the data incoming response command (2113) from the wireless data terminal 104B (S2206), the main unit 101 sends to the wireless data terminal 104B communication resource information such as a hopping pattern used for data communication. The communication setting command (2115) containing it is transmitted (S2207).

Upon receiving the communication setting command (2116) in the LCCH-T field (S2403), the wireless data terminal 104B sets the hopping pattern obtained from the communication resource information in the frame processing section (S240).
4).

[0230] Next, the main unit 101 is the wireless data terminal 1
A communication response command (2117) is transmitted to 04A (S2208) to notify that the wireless terminal 104B has responded.

The wireless data terminal 104A which has confirmed the partner response (S2307) by the communication response command (2118).
Sends a communication start command (212
0) is transmitted (S2308), and then data communication is started with the wireless data terminal 104B using the BDF (S23).
09).

The main device 101 is the wireless data terminal 104A.
From the communication start command (2119) (S220
9) Then, it is determined that the wireless data terminal 104A and the wireless data terminal 104B have started data communication, and waits for a communication end command (S2210).

(Processing during wireless data communication) As described above, the wireless data terminal 104A and the wireless data terminal 104 are connected.
BDF packet communication is performed while frequency switching is performed with B using a common hopping pattern.

Then, the outline of the data communication will be described below. FIG. 26 shows a transmission operation of the wireless data terminal 104A,
6 is a sequence diagram showing an outline of a receiving operation of the wireless data terminal 104B.

When a transmission request is issued to the wireless data terminal 104A, the wireless data terminal 104A confirms whether or not there is data being transmitted (carrier sense). Then, if the frequency channel is not used by the wireless data terminal 104B, a transmission request packet is assembled and transmitted to the wireless data terminal 104B (2501).

When the wireless data terminal 104B receives this transmission request command, if the wireless data terminal 104B is in a receivable state, it transmits a reception permission packet (2502) to the wireless data terminal 104A after carrier sensing.

The wireless data terminal 104A which has received this reception permission packet starts transmission of the data packet after carrier sense (2503).

Then, when the transmission of the final packet is completed and no reception error is confirmed in the received data packet, the radio data terminal 104B receives the reception response packet (2
504) is transmitted to the wireless data terminal 104A and normal reception is notified.

Upon receiving this reception response packet, the wireless data terminal 104A sends a communication end packet (2505) to the wireless data terminal 104B to notify the end of communication.

The wireless data terminal 104B receiving this communication end packet, the communication end confirmation packet (2506)
To end the communication.

In this way, data is transmitted and received between terminals.

Next, FIG. 27 shows the wireless data terminal 104A.
7 is a flowchart showing an internal data packet transmission operation.

(Transmission of Data Packet) The wireless data terminal 104A transmits a transmission request packet to the wireless data terminal 104B after carrier sense (S2601) (S).
2603).

When the reception permission packet is received from the wireless data terminal 104B (S2604), the wireless data terminal 104A performs carrier sense (S2605),
If the frequency channel can be used, after transmitting the preamble signal, the data packet transmission is continuously started (S2606).

When all the data packets have been transmitted by repeating the above processing (S2607), the wireless data terminal 104A waits for a reception response packet from the wireless data terminal 104B (S2608).

When the wireless data terminal 104A receives the reception response packet from the wireless data terminal 104B (S2608), the wireless data terminal 104A transmits a communication end packet (S2609).

When the communication end confirmation packet is received from the wireless data terminal 104B (S2610), it is considered that the reception is normally completed, and the transmission process is ended.

(Data Packet Reception Processing) Next, referring to FIG.
8 is a flowchart showing a data packet receiving operation inside the wireless data terminal 104B.

First, when a transmission request packet is received from the wireless data terminal 104A (S2701), the wireless data terminal 104B determines whether or not data reception is possible, and if so, carries out carrier sense (S2).
702).

As a result of the carrier sense, if the wireless data terminal 104A has not transmitted, a reception permission packet is assembled and transmitted to the wireless data terminal 104A (S2703).

If the first data packet is received subsequent to the reception permission packet (S2705), an error check is performed on the data. As a result, if it is determined that there is no transfer error in the packet, the data is regarded as normal reception. The packet is stored in the memory 505.

If the process of S2705 is repeated for each data packet and the final data packet is normally received (S2705), a reception response packet is assembled and carrier sensing is performed (S2706), and the reception response packet is transmitted to the wireless data terminal. 104A (S270)
7).

When the communication end packet is received (S2708), after the carrier sense (S2713), the communication end confirmation packet is transmitted (S2710),
All reception processing ends.

(End processing of data communication) At the end of communication, the wireless data terminal 104A sends a communication end command (2125) to the main device 101 (S231).
0).

The main device 101 which has received this communication end command (2124) (S2210) is the wireless data terminal 1
A communication setting cancellation command (2126) is transmitted to 04A (S2211). Next, the main apparatus 101 releases communication resources such as voice channels allocated to the wireless data terminals 104A and 104G (S221).
2).

The communication setting cancel command (2127, 2
The wireless data terminals 104A and 104G that have received 129) (S2311, 2407) clear the communication settings (S2312, S2408).

As described above, in the present wireless switching system, in addition to the call service between the public line and the telephone, which is carried out by the conventional telephone switching device, the extension telephone (corresponding to the wireless telephone in this embodiment) is also used. It is possible to provide high-speed data communication service between communication and wireless data terminals.

Although the slow frequency hopping is used in the above-mentioned first embodiment, the same effect can be expected even when the direct spread method is used as the second embodiment of the present invention.

This can be realized by using the direct spreading method for each of the radio units in the main unit, the connection unit, the radio telephone and the radio adapter shown in FIGS.

FIG. 29 (1) shows an example of the communication procedure when the direct spreading method is used.

In this case, first, the inside of the communication frame used for communication is divided into a main device frame and a wireless terminal frame on the time axis. That is, the main device frame and the wireless terminal frame are alternately transmitted.

FIG. 29 (2) is an explanatory view showing an example of the main device frame.

The main device frame has a control field and a data field for each wireless terminal. The FSYN field in the figure is a synchronization command.

Cn (n = 0, 1, 2, ...)
This is a field for transmitting a control command from the main device to the wireless terminal n (n = 0, 1, 2, ...).
n (n = 0, 1, 2, ...) Is a transmission data field. GT is a guard time for frequency switching.

FIG. 29 (3) is an explanatory view showing an example of the wireless terminal frame.

Each radio terminal transmits a control command or data in synchronization with a specific field assigned in the radio terminal frame by the main unit.

The FSYN field in the figure is a synchronization command, and GT is a guard time. Also, Cn
(N = 0, 1, 2, ...) is a wireless terminal n (n = 0, 1,
2, ...) is a field for transmitting a control command to the main device, and Tn (n = 0, 1, 2, ...)
Is a transmission data field.

Each transmission data and control command have a one-to-one correspondence, and the receiving side terminal receives the data and control command in synchronization with the field by the field number notified from the main device by the main device frame. To do.

Further, in this wireless exchange system, communication between wireless dedicated telephones and communication with a public line are performed, but control of establishing a communication path is performed by the main unit, and the main unit controls the state of each wireless terminal and all the states. It manages the communication status.

Since the transmission rate can be increased by using the direct spread communication method in the wireless switching system,
It is possible to obtain the effect of increasing the number of multiplexed data fields in one frame. Further, it becomes possible to realize a wireless switching system that is more excellent in secrecy and noise resistance than when the frequency hopping method is used.

[0271]

As described above, according to the first aspect of the present invention.
According to this, the wireless switching system can provide wireless communication with high transmission capability. According to the second aspect, it is possible to realize a wireless exchange system having excellent confidentiality and noise resistance.

According to the third aspect, not only the communication service between the public line and the telephone but also the communication service between the plurality of telephones and / or the plurality of data terminals can be provided. Further, according to claim 4, it is possible to assemble and / or disassemble a plurality of radio transmission frames necessary for obtaining the operation described in claim 3.

According to the fifth aspect, it is possible to select a radio transmission frame of a format suitable for various communication services according to the third aspect. According to claim 6,
Since the communicating terminal can determine the frame type without notifying the type of the wireless transmission frame in advance, an efficient communication sequence can be realized. According to claim 7, a plurality of communication services according to claim 3 and claim 4 are provided.
It is possible to obtain simultaneously the effects obtained from the plurality of wireless transmission frames shown in.

According to claim 8, the present invention can provide not only a communication service between a public line and a telephone but also a communication service between a plurality of telephones and / or a plurality of data terminals. According to the ninth aspect, not only voice data but also character data, image and video data communication can be performed.

[Brief description of drawings]

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

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

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

FIG. 4 is a block diagram showing a configuration of a wireless telephone in the above-described embodiment.

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

FIG. 6 is a block diagram showing a configuration of a wireless unit in the above embodiment.

FIG. 7 is an explanatory diagram showing a frame format used in the embodiment.

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

FIG. 9 is a block diagram showing a frame processing unit in the embodiment.

FIG. 10 is an explanatory diagram showing frequency hopping in the above embodiment.

FIG. 11 is an explanatory diagram showing frequency switching in the above embodiment.

FIG. 12 is a sequence diagram showing an operation at power-on in the above embodiment.

FIG. 13 is a flowchart showing an operation when the main device power is turned on in the above embodiment.

FIG. 14 is a flowchart showing an operation when the wireless terminal is powered on in the above embodiment.

FIG. 15 is a sequence diagram showing an operation at the time of making an outside line in the above embodiment.

FIG. 16 is a flowchart showing an operation of the main device when an outside line is transmitted in the above embodiment.

FIG. 17 is a flowchart showing the operation of the wireless telephone when an outside line is called in the above embodiment.

FIG. 18 is a sequence diagram showing control commands exchanged by the main device, the connection device, and the wireless telephone during extension communication in the above-described embodiment.

FIG. 19 is a flowchart showing the operation of the main device during extension communication in the above embodiment.

FIG. 20 is a flowchart showing the operation of the calling-side wireless telephone during extension communication in the above-mentioned embodiment.

FIG. 21 is a flowchart showing the operation of the called-side wireless telephone at the time of extension communication in the above embodiment.

FIG. 22 is a sequence diagram showing an operation at the time of communication between wireless data terminals in the above embodiment.

FIG. 23 is a flowchart showing the operation of the main device during communication between wireless data terminals in the above embodiment.

FIG. 24 is a flow chart showing an operation of a calling side wireless data terminal at the time of communication between wireless data terminals in the above embodiment.

FIG. 25 is a flowchart showing an operation of the receiving-side wireless data terminal at the time of communication between wireless data terminals in the above embodiment.

FIG. 26 is a sequence diagram showing an operation during communication between wireless data terminals in the above embodiment.

FIG. 27 is a flowchart showing a data transmission operation of a wireless data terminal at the time of communication between wireless data terminals in the above embodiment.

FIG. 28 is a flowchart showing a data receiving operation of the wireless data terminal at the time of communication between wireless data terminals in the above embodiment.

FIG. 29 is an explanatory diagram showing a direct sequence communication procedure, a main device frame, and a wireless terminal frame used in the second embodiment of the present invention.

FIG. 30 is a block diagram showing a configuration of a main device in a conventional system.

FIG. 31 is a block diagram showing a configuration of a connection device in a conventional system.

FIG. 32 is a block diagram showing the configuration of a wireless telephone in a conventional system.

FIG. 33 is a sequence diagram showing a transmission operation in the conventional system.

[Explanation of symbols]

 101 ... Main device, 102 ... Public line, 103A, 103B ... Wireless telephone, 104A, 104B ... Computer, 104C ... Copier, 104D ... Multimedia terminal, 104E ... Facsimile, 104F ... LAN bridge, 104G ... Printer.

Claims (9)

[Claims] 1. A wireless switching system, comprising: a main device that accommodates a public line and provides various communication services; and a plurality of wireless terminals that can perform wireless communication with the main device. , A wireless switching system characterized by using spread spectrum wireless as a wireless system and using a low frequency frequency hopping system as a spreading system. 2. A wireless switching system configured to include a main device that accommodates a public line and provides various communication services, and a plurality of wireless terminals that can perform wireless communication with the main device. , A wireless switching system characterized by using spread spectrum wireless as a wireless method and using a direct spreading method as a spreading method. 3. The first communication means for communicating communication data and control information between the main device and the wireless terminal, and the communication data and control information between the plurality of wireless terminals according to claim 1. And a second communication means for communicating with the wireless switching system. 4. The communication control means according to claim 1, which has a different internal format from a communication control means for performing wireless communication by a wireless transmission frame having an area for storing the communication data and / or the control information. And a frame processing means for assembling and disassembling a plurality of the wireless transmission frames. 5. The wireless terminal according to claim 1, wherein the wireless terminal uses first identifying means for identifying a type of the communication service requested to the main device, and the first identifying means. A wireless switching system comprising: a selecting unit that selects an internal format of the wireless transmission frame according to a result obtained. 6. The device according to claim 4, wherein the wireless transmission frame has an area for storing a frame type, a unit for reading the frame type in the wireless transmission frame, and the frame according to the frame type. And a means for causing the processing means to execute different disassembling processing. 7. The wireless switching system according to claim 1, further comprising means for switching a frequency to be transmitted during or before wireless transmission of the one wireless transmission frame. 8. The wireless switching system according to claim 1, wherein the wireless terminal in the system is a data terminal connected to a wireless telephone and / or a wireless adapter. 9. The method according to claim 1, wherein the type of the communication data transmitted using the wireless transmission frame is voice data and / or character data and / or image data and / or video data. A wireless switching system characterized by: