JPH0918953A - Radio exchange method and its system - Google Patents

Abstract

PURPOSE: To transmit dial information at dialing more quickly and accurately and to enhance the degree of freedom of entry of the dial information by allowing a radio communication terminal equipment to send dial information of each 1-digit entry in addition to control data to a master set in the case of dialing to a public line and allowing the master set to dial the dial information together with the control data to the public line. CONSTITUTION: A radio exclusive telephone set 3 receiving a dial signal from a key matrix sends control data to a master set 1 as a dial signal. In the case of making dialing by the master set 1 to a public network, the master set 1 acquires the dial information every time dial information in 1-digit, is entered by the radio exclusive telephone set 3. The radio exclusive telephone set 3 receiving a push tone by an automatic dialer in the case of awaiting entry of dial information converts the push tone into a control code and sends the dial signal as control data to the master set 1. Thus, the transmission data quantity is enough to be small and a radio wave transmission time is decreased.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In recent years, wireless communication has rapidly progressed and has been used in various fields. A telephone exchange device (including a key telephone device) is no exception, and a system has been proposed in which a main device having an exchange function and a wireless telephone are wirelessly connected. Further, even in the wireless switching system as described above, the digital wireless system is often used as the wireless system. Among the digital wireless communication systems, the spread spectrum communication has received particular attention.
Spread spectrum communication spreads information to be transmitted over a wide band, and is known to have high interference removal capability and excellent confidentiality. 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.

[0003] Spread spectrum communication systems are roughly divided into frequency hopping (FH system) and direct spread (DS).
Method). The former is to perform transmission using a wide band by changing the modulation frequency within a fixed time, and the latter is to spread the information to be transmitted with a pseudo-noise code at a speed that is ten to several hundred times faster. It uses a wide band.

By the way, in the conventional wireless switching system,
As a method of sending dial information to the main device when making a call from a wireless-only telephone, there are a method of using control data and a method of transmitting as control data. When the dial information is sent as the control data, the dial information is transmitted to the main device more accurately. When the dial information is sent as voice data, the main unit sends the data as it is to the outside line, which simplifies dialing to the public network side.

[0005]

However, the conventional transmission of dial information using the above method has the following problems. (1) When sending dial information to the main device using control data, not only is the channel occupied during that time, but the control data transmission time interval is shorter than the dial information input time interval. Will be sent more times than necessary.

(2) When dial information is input as push sound data and is sent to the main device as voice data, the data amount increases, so the probability of data error increases, and the radio wave transmission time also increases. Become. (3) In the wireless switching system as described above, when transmitting to the public network, an ID such as "0" is first added to the transmission. Here, when a user can register a destination address in advance and dials by using a device (auto dialer) that inputs the registered push sound data, only a public network address may be registered in the device. There are so many that you cannot dial as it is.

The present invention eliminates the above-mentioned conventional drawbacks, more quickly and accurately realizes transmission of dial information at the time of making a call from a wireless communication terminal to a main unit, and has a degree of freedom in input operation of dial information. An enhanced wireless switching method and system thereof are provided.

[0008]

In order to achieve the above object, a wireless switching method according to the present invention comprises a main unit accommodating a public line and a wireless communication terminal for connecting to the public line via the main unit. A wireless switching method in a wireless switching system comprising: when the wireless communication terminal makes a call to the public line, the wireless communication terminal sets dial information to 1
Each digit input is carried on control data and transmitted to the main device, and the main device transmits the dial information passed by the control data to a public line.

Here, when dial information is input by a push sound from a microphone from the wireless communication terminal,
The input push sound data is converted into a control code and sent to the main device. Further, when dial information is input from the wireless communication terminal for one communication, it is possible to further input each digit by both input from a dial key and a push sound from a microphone. The communication between the main device and the wireless communication terminal is wireless communication by spread spectrum including a frequency hopping method and a direct spread method.

Further, the wireless switching system of the present invention includes a main unit which accommodates a public line and wirelessly communicates with a wireless communication terminal,
In a wireless switching system configured by the wireless communication terminal that wirelessly communicates with the main device, the wireless communication terminal,
When making a call to the public line, it has dial transmitting means for transmitting dial information to the main device by digitizing the dial information for each digit, and the main device communicates with a public circuit as an external line. It is characterized by having a wireless communication switching means for exchanging wireless communication as an extension and a public line transmitting means for transmitting the dial information passed by the control data to a public line.

Here, the dial transmission means transmits the control data to the main device when the dial information of each digit is input. The wireless communication terminal further includes means for inputting dial information as a push sound from a microphone, and means for converting the input push sound data into a control code. Further, the wireless communication terminal further includes means for enabling both input from a dial key and a push sound from a microphone for each digit when inputting dial information for one communication. The communication between the main device and the wireless communication terminal is wireless communication by spread spectrum including a frequency hopping method and a direct spread method.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, a case where digital radio communication by a frequency hopping method is used for extension transmission of a switching system will be described in detail, but the present invention is not limited to this. <Configuration Example of Wireless Switching System> FIG. 1 shows a configuration example of a wireless switching system assumed in this embodiment.

This system accommodates the public line 102,
An exchange 101 having an exchange function and a wireless connection function;
A plurality of wireless dedicated telephones 103-A and 103-B for communicating control data and voice data with the exchange 101.
And data terminals 104-A to 1 for performing control data communication with the exchange and direct data communication between terminals.
04-F.

The data terminal device according to the present embodiment is a combination of "a terminal (data terminal) having a function of transmitting an arbitrary amount of data in a burst and a wireless adapter for controlling wireless communication between the data terminal and the main device. Data terminal, and the data terminal is not limited to the computer 104-A,
The printer 104-B, the copier 104-C, the video conference terminal 104-D, the facsimile 104-E, the LAN bridge 104-F, and other various terminals that perform data processing such as an electronic camera, a video camera, and a scanner are applicable.
A major feature of this system is that these wireless-only telephones and data terminals can freely communicate with each other and at the same time can access the public network.

The detailed configuration and operation of each component will be described below. (Example of Configuration of Exchange 101) First, the configuration of the exchange 101 accommodating a public line will be described. FIG. 2 is a drawing showing the detailed system configuration of the present embodiment and the configuration of the exchange 101. Reference numeral 1 denotes a main device which accommodates a plurality of outside lines and a plurality of terminals and exchanges calls between them, which is a main part of the present switching system, and 2 a wireless terminal (a wireless dedicated telephone, which will be described later,
A connection device that establishes a wireless transmission path by wirelessly controlling the wireless terminal under the control of the main device so that a data terminal to which a wireless adapter is connected) can be accommodated in the system. The main device 1 and the connection device 2 constitute an exchange 101.

Reference numeral 3 is a wireless-only telephone for communicating with an external line accommodated in the main unit via the connection device 2 and for mutual extension communication. Reference numeral 4 is a wireless adapter which enables wireless data transmission between similarly configured data terminals by connecting to a data terminal 5 such as a personal computer and a printer, an SLT (single telephone) 10, a facsimile 11, and an ISDN terminal 12. 6 is a PSTN (existing public network) which is one of the external networks accommodated in 1 of the main device 1, 7 is a PSTN line which is an external line from the PSTN 6, and 8 is an external network accommodated in the main device 1. One of the ISD
N and 9 are ISDN lines which are external lines from ISDN 8. 10 is an SLT that is one of the terminals accommodated in the main device 1.
(Single phone).

(Structural Example of Main Device 1) The internal structure of the main device 1 will be described below. Reference numeral 201 denotes a CPU which is the center of the main unit 1 and controls the entire main unit including exchange control. Reference numeral 202 is a ROM in which a control program for the CPU 201 is stored, and 203 is a RAM which stores various data for controlling the CPU 201 and provides a work area for various calculations. Reference numeral 204 is a call path unit that controls call exchange (time division exchange) under the control of the CPU 201, and 205 is a CPU
Under the control of 201, the PSTN line i / f performs PSTN line control such as incoming call detection for accommodating the PSTN line, selection signal transmission, and DC loop closure. 206 is the CPU 20
Under the control of 1, the ISDN line i / f supports ISDN layers 1 and 2 for accommodating the ISDN line and controls the ISDN line.

Reference numeral 207 denotes an SLTi / f for controlling the connection between the SLT and the communication path unit 204, and the CPU 2 when the power is on.
It functions as a dedicated telephone with a display etc. under the control of 01, so that it can only talk as an SLT during a power failure.
It controls 204. 208 is a CPU when energized
Under the control of 201, it is a wireless dedicated telephone unit having a handset, a dial key, a communication circuit, a notation device, etc. that functions as an extension wireless dedicated telephone and functions as an SLT at the time of power failure. 20
Reference numeral 9 is a tone sending circuit for sending various tones such as PB signal, dial tone and ring tone. Under the control of the CPU 201, 210 is a connection signal with the connection device 2 for accommodating the connection device 2,
A connection device i / f that transmits and receives a control signal.

(Structural Example of Connection Device 2) FIG.
2 is a diagram showing a configuration of FIG. Reference numeral 301 denotes a central part of the connection device 2, and a CPU that controls the entire connection device 2 including control of a communication channel and control of a radio unit. 302 is the CPU 30
The ROM storing the control program No. 1 and 303 stores the call code (system ID) of the exchange system E
An EPROM 304 is a RAM that stores various data for controlling the CPU 301 and provides a work area for various calculations. Reference numeral 305 denotes a main device i / f that sends and receives a call signal and a control signal to and from the connection device i / f 201 of the main device 1 under the control of the CPU 301.

Under the control of the CPU 301, 306 converts a PCM-coded call signal from the main unit 1 into an ADPCM code and transmits it to a channel codec 307, which will be described later, and at the same time, an ADPCM-coded call from the channel codec 307. PCM / AD for converting a signal into a PCM code and transmitting to the main unit 1 PCM / for converting a call signal encoded with the PCM code into a PCM code and transmitting to the main unit 1
It is an ADPCM converter. Under the control of the CPU 301, a channel codec 307 performs processing such as scrambling on the ADPCM-coded speech signal and control signal and time-division-multiplexes them into a predetermined frame. 308
Is a channel codec 307 under the control of the CPU 301.
This is a radio section that modulates the framed digital signal from and processes it so that it can be sent wirelessly and sends it to the antenna, and demodulates the signal received from the antenna and processes it into a framed digital signal. .

(Structural Example of Radio-Only Telephone 3) FIG. 4 is a diagram showing the structure of the radio-only telephone 3. Reference numeral 401 is the center of the wireless-only telephone 3, and is a CPU that controls the entire wireless-only telephone 3 including control of the wireless unit and call control. Four
02 is an RO in which the control program of the CPU 401 is stored
M and 403 are call codes (system I) of this switching system.
D), EEPRO that stores the sub-ID of the wireless telephone
RAs for storing various data for controlling the CPU 401 and providing a work area for various calculations.
M. Reference numeral 405 is a call circuit that inputs and outputs 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. 406 is CP
Under the control of U401, the analog voice signal from the communication circuit 405 is converted into an ADPCM code and transmitted to a channel codec 407 described later, and at the same time, the channel codec 40
It is an ADPCM codec for converting the ADPCM-coded call signal from 7 into an analog voice signal and transmitting it to the call circuit.

Reference numeral 407 denotes an ADP under the control of the CPU 401.
It is a channel codec that performs processing such as scrambling on a CM-coded speech signal and control signal and time-division-multiplexes into a predetermined frame. 408, under the control of the CPU 401, modulates the framed digital signal from the channel codec 407, processes it so that it can be transmitted wirelessly, transmits it to the antenna described later, and demodulates the signal received wirelessly from the antenna. It is a wireless unit that processes a framed digital signal. Reference numeral 410 is a handset for inputting / outputting a voice signal for communication, 411 is a microphone for collecting and inputting the voice signal, and 412 is a speaker for outputting the voice signal. A display unit 413 displays a dial number input from a key matrix to be described later and a usage status of an outside line. Reference numeral 414 is a key matrix including 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.

(Structural Example 1 of Wireless Adapter 4) FIG. 5 is a diagram showing a structure of a data communication terminal that can be accommodated in the system and an internal block structure of a wireless adapter connected to the data terminal. In the figure, reference numeral 501 is a data terminal, 502 is a wireless adapter, and 503 is a wireless unit.
Reference numeral 1 denotes, for example, a personal computer, a workstation, a printer, a facsimile, or other data terminal equipment connected to the wireless adapter 502 via a communication cable or an internal bus.

Reference numeral 504 denotes a main control unit, which is composed of a CPU, peripheral devices for performing interrupt control, DMA control, etc., an oscillator for system clock, etc., and controls each block in the wireless adapter. 505 is a memory,
R for storing the program used by the main control unit 504
OM, RAM used as buffer area for various processes
And so on. A communication i / f unit 506 is a communication i / f that is standardly equipped with a data terminal device such as the data terminal 501 described above, for example, a communication i / f such as RS232C, Centronics, LAN, a personal computer, or a work. Internal bus of the station, eg ISA
This includes buses and PCMCIA i / f. Reference numeral 507 denotes a terminal control unit, which is a data terminal 5 via the communication i / f 506.
01 and the wireless adapter 502 are responsible for various communication controls required during data communication.

Reference numeral 508 is a channel codec for performing frame processing and radio control, and its internal configuration is shown in FIG.
The data assembled into frames by the channel codec is transmitted to the main device or the opposite terminal via the wireless unit. An error correction processing unit 509 is used to reduce bit errors occurring in data by wireless communication.
At the time of transmission, an error correction code is inserted in the communication data.
Further, at the time of reception, an error position and an error pattern are calculated by arithmetic processing, and a bit error in the received data is corrected. A timer 510 provides a timing signal used by each block inside the wireless adapter.

(Structural Example 2 of Wireless Adapter 4) FIG. 6 shows the structure of a wireless adapter with a built-in modem, which is required when transmitting data to a public line. In the figure, 511 is a modem for modulating data into a voice band signal, and 512 is an ADPCM codec for encoding the signal modulated by the modem. The ADPCM encoded data is assembled into a frame by the channel codec and transmitted to the main device via the wireless unit.

(Structure of Radio Unit) FIG. 7 shows a radio unit (308, 408, 503) commonly used by the connection device 2, the wireless telephone 3 and the wireless adapter 4 of the data terminal of this system.
FIG. 3 is a diagram showing the configuration of FIG. Reference numerals 601a and b denote transmitting / receiving antennas, 602 a switch for switching the antenna 601, and 60
3 is a band pass for removing unnecessary band signals.
Filter (hereinafter BPF), 604 is a transmission / reception changeover switch, 605 is a reception system amplifier, 606 is a transmission system amplifier (with power control) 607 is a 1st. IF
Down converter, 608 is an up converter, 60
9 is a transmission / reception changeover switch, 610 is a BPF for removing a signal in an unnecessary band from the signal converted by the down converter 607, and 611 is 2nd. IF
A down converter for the down converter 60
7, 611 constitutes a double-conversion system reception form.

612 is 2nd. BPF for IF, 613
Is a 90 ° phase shifter, 614 is a quadrature detector, and BP
The signal received by the F612, 90 ° phase shifter 613 is detected and demodulated. Reference numeral 615 is a waveform shaping comparator, 616 is a voltage control type oscillator (hereinafter VC) of the receiving system.
O) and 617 are low-pass filters (hereinafter LP
F) and 618 are PLLs including a programmable counter, a prescaler, a phase comparator, etc.
16, the LPF 617, and the PLL 618 form a frequency synthesizer for the receiving system.

Reference numeral 619 denotes a VCO for generating a carrier signal, 6
Reference numeral 20 is an LPF, 621 is a PLL including a programmable counter, a prescaler, a phase comparator, and the like.
A frequency synthesizer for hopping is configured by O619, LPF620, and PLL621. 622 is a VCO of a transmission system having a modulation function, 623 is an LPF, 624
Is a PLL including a programmable counter, a prescaler, a phase comparator, and the like.
23, the PLL 624 constitutes a frequency synthesizer of a transmission system having a frequency modulation function.

625 is various PLLs 618, 621, 62
4 is a reference clock, and 626 is a band limiting filter for transmission data (baseband signal). The operation of this radio unit will be described below. 1. During transmission, data (digital data) input from an external circuit such as a processor is band-limited by a baseband filter 626 and then input to a modulation terminal of a transmission system VCO 622. The transmission system VCO 622 determines the frequency by the control voltage output from the circuits of the transmission system PLL 624 and the LPF 623, and generates an intermediate frequency (IF) modulated wave by direct modulation. Frequency synthesizers 622, 623, 62
The intermediate frequency (IF) modulated wave generated by the signal No. 4 is input to the up converter 608, and the VCO 619 and the LPF 6 are input.
20, after being added with the carrier signal generated by the frequency synthesizer composed of the hopping PLL,
It is input to the transmission system amplifier 606. Transmission system amplifier 606
The signal amplified to a predetermined level by the BPF603
Antenna 601 after the unnecessary band signal is removed by
Is emitted into space as radio waves.

2. At reception The signal received by the antenna 601 is the BPF 603.
Then, the signal in the unnecessary band is removed, and then the signal is amplified to a predetermined level by the reception system amplifier 605. The received signal amplified to a predetermined level has the carrier signal removed by the down converter 607 and the 1st. Converted to IF frequency. 1st. The received signal of IF is BPF61
After the unnecessary band signal is removed by 0, 2nd. The signal is input to the down converter 611 for IF. The down converter 611 includes a VCO 616, an LPF 617, and a receiving system P.
The signal generated by the frequency synthesizer composed of LL618 and the 1st. 2n depending on the input signal from IF
d. A signal having an IF frequency is generated. 2nd. The received signal down-converted to the IF frequency is BPF61
After the unnecessary band signal is removed by 2, the signal is input to the 90 ° phase shifter 613 and 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. The data (analog data) demodulated by the quadrature detector 614 is waveform-shaped as digital data by the comparator 615 and output to an external circuit. (Wireless Frame) FIG. 8 shows an example of the overall configuration of a wireless frame used in this system, and FIG. 9 shows each frame in the overall configuration of FIG. In this system, "main device-wireless dedicated telephone communication frame" (hereinafter abbreviated as PCF), "wireless dedicated telephone communication frame"
(Hereinafter abbreviated as PPF), "burst data frame"
Three different frames (hereinafter abbreviated as BDF) are used. Hereinafter, the details of the internal data of each frame will be described.

The PCF is shown in FIG. In the figure, FSYN is a synchronization signal, LCCH-T is a logical control channel sent from the main unit to the wireless telephone, LCCH-T.
R is a logical control channel sent from the wireless dedicated phone to the main unit, T1, T2, T3 and T4 are voice channels sent to four different wireless dedicated phones, and R1, R2, R3 and R4 are four different wireless dedicated phones. The voice channel sent from, GT represents the guard time. Further, in this figure, F1 and F3 indicate frequency channels used when wirelessly transmitting this frame, and indicate that the frequency channel is changed for each frame.

FIG. 8B shows the PPF. In the figure, FSYN is a synchronization signal, LCCH-T is a logical control channel sent from the main unit to the wireless telephone, LCCH-T.
R is a logical control channel sent from the wireless-only telephone to the main unit, T1, T2 and T3 are voice channels sent to three different wireless-only telephones, and R1, R2 and R3 are sent from three different wireless-only telephones. The incoming voice channel, GT, represents the guard time. Also, in this figure, F1, F
3, F5 and F7 are frequency channels used when transmitting this frame wirelessly, and unlike PCF, after receiving the logical control information LCCH-T from the main device in F1, the frequency channel is changed. Switch to F5, which is secured for communication between wireless-only telephones, and perform communication between wireless-only telephones. After that, the procedure of switching the frequency channel to F3, receiving the logical control information from the main device, and switching the frequency channel to F7 secured for the communication between the wireless dedicated telephones is repeated until the communication between the wireless dedicated telephones is completed.

FIG. 8C shows the BDF. In the figure, FSYN is a synchronization signal, LCCH-T is a logical control channel sent from the main unit to the wireless telephone, LCCH-T.
R is a logical control channel sent from the wireless telephone to the main unit, R is the carrier sense time for confirming that the previous frame has ended, and for confirming whether another wireless unit is emitting radio waves. , PR1 is the preamble, D
ATA is a data slot for storing burst data,
GT represents a guard time. Also, in this figure, F
1, F3, F5, F7 are frequency channels used when transmitting this frame wirelessly, and
Unlike F, after receiving logical control information from the main device in F1, the frequency channel is switched to F5 which is secured for burst data communication, and communication between wireless dedicated telephones is performed. After that, the procedure of switching the frequency channel to F3, receiving the logical control information from the main device, and switching the frequency channel to F7 secured for burst data communication is repeated until the burst data communication is completed.

FIG. 9A shows an FSYN frame.
In the figure, PR is a 62-bit preamble for supplementing frequency synchronization specified by the Radio System Development Center (hereinafter abbreviated as RCR), SYN is a 31-bit frame synchronization signal specified by RCR, and ID is RCR. 63-bit calling signal to be defined, FI is a 2-bit channel type signal for distinguishing PCF / PPF / 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 in this embodiment.

FIG. 9B shows a voice channel frame. T1, T2, T3, T4, R1, R2, R3 and R
Since the configuration of 4 is common, the transmission voice channels are collectively referred to as Tn, and the reception voice channels are collectively referred to as Rn. The configurations of Tn and Rn are also common. In the figure, R is the carrier sense time for confirming that the previous frame has ended and for confirming whether another wireless device is emitting a radio wave, PR1 is a preamble for each slot, and UW is a terminal. Unique word including ID, D is 3.2 kbps D channel information, B is 3
B channel information of 2 kbps, GT represents a guard time. The numbers in the figure indicate the number of bits in this embodiment.

The logical control channel LCCH is shown in FIG. 9 (c).
-T shows a frame structure. LCCH-T is a logical control channel sent from the main unit to the wireless telephone. Following the same figure, UW is a unique word including a sub ID,
LCCH represents logical control information, and GT represents guard time.
Since LCCH-T is sent continuously after sending FSYN,
No preamble is added.

The logical control channel LCCH is shown in FIG.
-R shows a frame structure. LCCH-R is a logical control channel sent from the wireless-only telephone to the main unit. In the figure, R is a carrier sense time for confirming that the previous frame has ended, and for confirming whether another wireless device is emitting a radio wave, PR1 is a slot preamble to buy, UW is A unique word including a sub ID, LCC represents logical control information, and GT represents guard time.

(Channel Codec) The above frame is processed by the channel codec. FIG. 10 shows the internal structure of the channel codec. In FIG.
Reference numeral 1 is a channel codec, 802 is a wireless section, 803 is an ADPCM codec built into a wireless telephone, etc., 8
Reference numeral 04 is a CPU of a wireless telephone or a wireless adapter.

Inside the channel codec 801, a radio control unit 805 controls transmission / reception switching and frequency hopping to the radio unit. Further, it has a function of performing carrier detection prior to data transmission. Reference numeral 807 denotes an i / f for exchanging control information with the CPU 804, and has a built-in register that stores the state and operation mode of each unit in the ASIC. Depending on the control signal from the CPU and the state of each part in the ASIC, the ASIC
It controls each part. Reference numeral 806 denotes an ADPCM codec i / f, and with the ADPCM codec,
Exchanges serial data and synchronous clocks for exchanging audio signals. A transmission frame processing unit 808 assembles a signal from the ADPCM codec and logical control data input from the CPU into a transmission frame shown in FIG. A reception frame processing unit 809 extracts control information and voice data from the frame of the signal from the wireless unit, and uses the ADPCM codec i / f and the CPU.
Pass to i / f. Reference numeral 810 is a synchronization processing unit composed of a DPLL, which reproduces a clock from a received signal and captures bit synchronization.

The basic operation of this ASIC will be described below. 1. Transmission Control information to be added to the transmission data frame is sent to the CPU 80
It is received by the CPU i / f 807 from 6. When the ASIC is used in the wireless dedicated telephone and the connection device in the main device, the transmission frame processing unit 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 burst data that has been subjected to error correction coding. When assembling the frame, the data is scrambled. It is necessary to maintain DC balance during wireless transmission. The radio control unit 805 takes the timing at which the reception signal ends, carries out carrier sensing, makes the radio unit transmit, and passes the transmission frame to the radio unit 802.

2. The reception wireless control unit 805 switches the wireless unit to reception when the data to be transmitted is completed, and waits for a reception frame. When it receives a received frame, it descrambles the data and then extracts control information and data from the received frame.
The control information is passed to the CPU 803 via the CPU i / f 806. When the received frame is PCF or PPF, the received data is ADPCM codec i / f8
If it is a wireless telephone, it is output as voice through the ADPCM codec 803, and if it is the main device, it is sent to the communication path. When the received frame is the BDF data, the received data is transferred to the memory in the data terminal.

3. Handling of logical control data (3-1) During non-communication Standby at the frequency assigned by the main device in advance, and periodically receives the LCCH-T from the main device. At this time, in the LCCH sent from the main unit,
It contains information such as whether there is an incoming call to the outside line and whether there is a call request on the wireless telephone side. The wireless telephone sends the LCCH extracted by the received frame processing unit to the CPU. After that, the LCC sent to the main unit specified by the CPU
H is sent to the main unit on the LCCH-R in the same frame. In this way, the wireless telephone repeats this procedure until an outgoing or incoming call occurs.

(3-2) At the time of communication 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 between the frequency channel F1 and the main unit during wireless communication.
The wireless telephone A uses the procedure described in (3-1) until a call is made, and the LCCH from the main unit is used on the frequency channel F1.
Are being monitored. When a call is originated at the wireless telephone A, a call request is put in the LCCH-R to be sent to the main unit and sent to the main unit in the procedure (3-1). The LCCH that informs whether communication is possible from the main unit side is determined by the LCCH sent on the frequency channel F1 after 100 ms.

If the contents of the LCCH from the main unit after the call request indicates that the line is full and connection cannot be made,
The wireless telephone A notifies the user that the telephone is busy. If the content of the LCCH from the main unit after the call request is shown to be connectable, the time slot of the voice channel used in the call is designated without the same LCCH-T. For example, if "1" is designated, it indicates that communication is performed using T1 and R1. FS and NF in FSYN frame
Communication is performed while switching frequency channels according to the frequency hopping pattern specified by R. The exchange of control information after connection with the main unit is performed based on the D channel information in the Tn and Rn frames.

In the case of the communication between wireless dedicated telephones, the control information between the wireless dedicated telephones is performed by the D channel information, and after completion of the communication, each wireless dedicated telephone is the LCCH-R of the designated frequency channel, that is, in the case of the previous example. Wireless dedicated phone A
Notifies the main device that the communication between the wireless-dedicated telephones has ended when the control information is exchanged with the main device on the frequency channel F1 during non-communication.

(Regarding Frequency Hopping Pattern) FIG. 11 shows a conceptual diagram of frequency hopping used in this system. In the system of this embodiment, 1 MHz using the 26 MHz band which is approved for use in Japan
Use 26 frequency channels of width. Considering the case where there are frequencies that cannot be used due to interference noise or the like, 20 frequency channels are selected from the 26 channels, and frequency hopping is performed on the selected frequency channels in a predetermined order. In this system, one frame has a length of 5 ms, and the frequency channel is hopped for each frame. Therefore, the length of one cycle of one hopping pattern is 100 ms.

In the figure, different hopping patterns are shown in different colors. In this way, by using a pattern in which the same frequency is not used at the same time in each frame, it is possible to prevent a data error from occurring. Further, when accommodating a plurality of connecting devices, it is also a feature of the present system that different connecting devices use different hopping patterns in order to prevent interference between the connecting devices. With this method, a system having a multi-cell configuration can be realized and a wide service area can be obtained.

<Operation Example of Wireless Switching System> As described above, in this system, the frame is assembled for the communication between the main device and the wireless telephone or the data terminal and between the terminals, and the frequency to be used is set. It is controlled to switch at regular intervals. The specific operation of this system will be described below in some cases.

(Example of basic operation procedure) In the present system, before using the speech channel, the slots to be used and the hopping pattern are used by using the logical control channels (LCCHT and LCCHR) which are time division multiplexed in the frame. And decide. Furthermore, in order for each terminal to perform intermittent reception and enable battery saving, each terminal is designed to transmit and receive only on a logical control channel that transmits at a frequency assigned in advance.

However, immediately after the power is turned on, the terminal does not recognize the hopping pattern. Therefore, it waits at an arbitrary frequency and receives a frame at that frequency. When the first frame is received, the frequency information of the next frame contained therein is fetched, and the frequency hopping is started. When a plurality of connecting devices are used, the hopping pattern used by the connecting device that can receive the frame for the first time is followed.
Immediately after the power is turned on, it is not determined which terminal is assigned to which frequency. Therefore, when the power is turned on, the registration of the ID of each terminal and the assignment of the logical control channel frequency are performed in the setting mode.

When the logical control channel is allocated,
Each terminal enters the intermittent reception state, and receives only the logical control data addressed to itself. Also, only when data to be transmitted to the main device occurs, the LCCHR of the assigned frequency
To send data to the main unit. When it is desired to start communication using the call slot, the main device must be notified using the logical control channel and the slot and hopping pattern must be assigned. After these allocations are made, it becomes possible to carry out telephone calls and data transmission.

The detailed operation in some cases will be described below. (Example of processing when making an outside call from a wireless telephone) FIG.
1 is an external line transmission sequence diagram according to the present embodiment, and FIG.
5 is an operation flowchart of the wireless-only telephone 3 when making an outside line call according to the present embodiment, and FIG. 16 is an operation flowchart of the main device 1 when making an outside line call according to this embodiment. Hereinafter, the operation procedure of this embodiment will be described with reference to FIGS. 14 to 16 with the two wireless-only telephones 3 as wireless-only telephones A and B.

When the outside line key arranged in the key matrix 414 is pressed in the wireless telephone A (S21)
01), the wireless telephone A causes the outside line LED of the display unit 413 corresponding to the pressed outside line button to emit and blink (S2
102), and transmits an outside line transmission signal 2002 to the main device 1 via the connection device 2 (S2103). This external line transmission signal is transmitted through the LCCH-R of the PCF frame shown in FIG. 8A on the wireless link between the wireless telephone A and the connection device 2.
To send. In the connection device 2, the main device i / f 305 notifies the main device.

Call 2001 to the public line 102
When receiving, the main device 1 determines whether or not the call can be transmitted to the public line 102 (S2201). Public line 102
If the line is free and you can make a call, the public line 10 to send
2 and PCF frame, which voice channel (T1 to T
4, R1 to R4) are used. External line transmission permission 2003 using the determined voice channel number as a parameter
To the wireless telephone A via the connection device 2 (S
2202), the public line 102 is captured (S220).
3). This outside line transmission permission is the LCCH of the PCF frame.
-Sent at T.

Upon receiving the outside line transmission permission signal 2004 (S2104), the wireless telephone A synchronizes with the voice channel of the parameter, and thereafter, both control data and voice data are communicated through this voice channel. Specifically, as shown in FIG. 9B, the control data is communicated in the D time slot and the voice data is communicated in the B time slot.
When the voice channel transfer on the wireless telephone A is completed,
Voice channel connection completion signal 200 with predetermined LCCH-T
6 is transmitted (S2105). The connection device 2 is the main device 1
When the external call permission is received from the channel codec 307, the channel codec 307 creates a route for receiving a predetermined voice channel and passing it to the main unit 1, and notifies the main unit 1 of the voice channel connection completion 2005 from the wireless telephone A. To do.

The main unit 1 completes the voice channel connection 200
When 5 is received (S2205), it is determined that the wireless telephone A is ready, and the outside line display green constant light instruction 2007 is transmitted to turn on the outside line LED in green (S2205).
In the wireless telephone A, the outside line display green constant light instruction signal 200
8 is received (S2106), the outside line LED is turned on in green, and the communication path inside the wireless telephone A is connected (S2106).
2107). In addition, the outside line display red constant light instruction 2009 is transmitted in order to turn on the outside line LEDs of the wireless line telephones B other than the wireless line telephone A that has transmitted the outside line in red.

Next, the wireless telephone A that has received the dial 2013 from the key matrix 414 (S210
8), LCCH of LCCR-R sends control data to main device 1
To a dial signal 2012 (S211).
1). The end of the dial 2013 is monitored by time-out (S2112), and the dial signal 2012 is transmitted to the main device 1 digit by digit until the time-out is reached. When the time is out, the call is in progress (S2113). In the main device 1, when the first digit of the dial 2011 is received (S220
6) Start dialing to the public network (S220)
7). Then, the transmission is also monitored due to the timeout (S2208), and when the dial transmission is completed, the call is in progress (S2209).

According to the procedure described above, when the main unit 1 makes a call to the public network 102, the main unit 1 obtains the dialing information each time one digit is input to the wireless telephone. You can Therefore, there is an advantage that the transmission operation to the public network can be started early and the time until the line connection is short. Further, in this embodiment, the dial 2013 is not received from the key matrix 414 (S210
8) When no push sound is input (S210)
9), the wireless telephone A waits for input without transmitting the dial signal 2012.

With this, since the wireless telephone only has to transmit the control data only when the dial information is input, the number of times the radio wave is transmitted up to the line connection can be reduced and the power consumption can be suppressed. Effective use of radio waves is possible. Further, in the present embodiment, when a push sound is input to the wireless telephone A by the auto dialer while waiting for dial information input (S2109), the input push sound is converted into a control code (S211).
0), the dial signal 2012 is transmitted to the main device 1 as control data (S2111).

As a result, the amount of data to be transmitted is small, the data error rate is low, the time for transmitting the radio wave is short, the power consumption can be suppressed, and the radio wave can be effectively used. Further, in the present embodiment, when the wireless telephone A receives the dial 2013 from the key matrix 414 while waiting for the dial information input (S2
108) transmits it as control data to the main device 1 (S
2111), if a push sound is input (S210)
9) converts the input push sound into a control code (S2110) and transmits it to the main device 1 as control data.

As a result, when the dial information is input for one communication, both the input from the dial key and the input with the push sound from the microphone are possible.
Since a dial number can be input by a push sound after first inputting a public network ID from a dial key, a commercially available auto dialer can be effectively used. <Other Embodiments> The slow frequency hopping is used in the above embodiments. However, a similar effect can be expected even when the direct spreading method is used. This is realized by using the direct spreading method for the wireless units of the connection device 2, the wireless telephone 3 and the wireless adapter 4 in the main device configuration diagram shown in FIG.

FIG. 12 shows an example of the communication procedure when the direct spreading method is used. First, communication is divided into a main device transmission frame and a slave device transmission frame on the time axis. That is, the main device transmission frame and the slave device transmission frame are alternately transmitted. FIG. 13A shows an example of the main unit transmission frame. The main unit transmission frame has control information and data slots for each wireless terminal. In the figure, FSYN is a synchronizing signal, Ck is control information from the main device to the wireless terminal k, Tk is transmission data for it, and GT is a guard time.

Further, FIG. 13B shows an example of the slave unit transmission frame. Each wireless terminal transmits control information and data in a certain time slot assigned in the slave device transmission frame. FSYN in the figure is a synchronization signal, and GT
Is a guard time, Ck is control information for the main device of the wireless terminal k, and Tk is transmission data for it.

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

Since the channel transmission rate can be increased by using the direct sequence communication system, it is possible to obtain the effect of increasing the number of slot multiplexing in the frame.
Further, it is possible to realize a wireless exchange system having excellent confidentiality and noise resistance more than when the FH method is used. The present invention may be applied to a system including a plurality of devices or an apparatus including a single device. Needless to say, the present invention can be applied to a case where the present invention is achieved 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 to the system or device, the system or device operates in a predetermined manner.

[0068]

As described above, according to the present invention, a wireless exchange method which realizes transmission of dial information from a wireless communication terminal to a main unit more quickly and accurately and has a high degree of freedom in input operation of dial information, and The system can be provided. Specifically, (1) the main device can obtain dialing information each time one digit of the dialing information is input to the wireless telephone, so that the originating operation to the public network can be started earlier. Yes, you can shorten the time to connect the line,
(2) Since the wireless telephone only needs to send control data when dial information is input, it is possible to reduce the number of times radio waves are created up to line connection, reduce power consumption, and use radio waves effectively (3) Since the voice data is converted into the control code and sent to the main unit, the transmission data amount can be small, the data error rate is low, and the transmission time of the radio wave is short, and the power consumption is low. (4) When inputting dial information to a communication terminal for one communication, both input from dial key and push sound from microphone are possible. Therefore, you can enter the public network ID from the dial key first, and then you can enter the dial number with a push sound, so a commercially available auto dialer is effective. Can be used, there is an effect and the like.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a wireless switching system according to an embodiment.

FIG. 2 is a diagram showing a configuration example of an exchange in the wireless exchange system of the present embodiment.

FIG. 3 is a diagram showing a configuration example of a connection device in the wireless switching system of the present embodiment.

FIG. 4 is a diagram showing a configuration example of a wireless dedicated telephone in the wireless switching system of the present embodiment.

FIG. 5 is a diagram showing a configuration example of a wireless adapter in the wireless switching system of the present embodiment.

FIG. 6 is a diagram showing a configuration example of a modem built-in wireless adapter in the wireless switching system of the present embodiment.

FIG. 7 is a diagram showing a configuration example of a wireless unit in the wireless switching system of the present embodiment.

FIG. 8 is a diagram showing an overall configuration of a frame format used in the wireless switching system of the present embodiment.

FIG. 9 is a diagram showing each frame format used in the wireless switching system of the present embodiment.

FIG. 10 is a diagram showing a configuration example of a channel codec used in the wireless switching system of the present embodiment.

FIG. 11 is a diagram illustrating a frequency hopping method used in the wireless switching system according to the present embodiment.

FIG. 12 is a diagram showing a direct sequence communication procedure used in a wireless switching system of another Embodiment 5;

FIG. 13 is a diagram showing a communication frame format between a main device and wireless terminals used in a wireless switching system of another embodiment 5 and between wireless terminals.

FIG. 14 is a diagram showing a sequence at the time of making an outside line in the wireless switching system of the present embodiment.

FIG. 15 is a flowchart showing an operation procedure of the wireless dedicated telephone at the time of making an outside line in the wireless exchange system of the present embodiment.

FIG. 16 is a flowchart showing an operation procedure of the main device at the time of making an outside line in the wireless switching system of the present embodiment.

[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 (9)

[Claims] 1. A wireless switching method in a wireless switching system, comprising: a main device accommodating a public line; and a wireless communication terminal connecting to the public line via the main device. When making a call to the public line, the wireless communication terminal puts dial information in control data for each digit input and transmits the control data to the main device, and the main device transmits the dial information passed in the control data. A wireless exchange method characterized by transmitting to a public line. 2. When dial information is input by a push sound from a microphone from the wireless communication terminal, the input push sound data is converted into a control code and sent to the main device. The wireless switching method according to claim 1. 3. When inputting dial information from the wireless communication terminal for one communication, it is possible to input each digit from both a dial key and a push sound from a microphone. Claim 1 characterized by the above.
Wireless exchange method described. 4. The communication between the main device and the wireless communication terminal,
4. The wireless exchange method according to claim 1, wherein the wireless communication is spread spectrum wireless communication including a frequency hopping method and a direct spread method. 5. A wireless switching system, comprising: a main device that accommodates a public line and wirelessly communicates with a wireless communication terminal; and a wireless communication terminal that wirelessly communicates with the main device. When making a call to the public line,
There is a dial transmission means for transmitting the dial information to the main device by putting the dial information in each digit into the control data, and the main device is a wireless communication for exchanging communication to a public circuit as an external line and wireless communication as an internal line. A wireless exchange system comprising: an exchange means and a public line transmission means for transmitting the dial information passed by the control data to a public line. 6. The wireless switching system according to claim 5, wherein the dial transmitting unit transmits the control data to the main device when dial information of each digit is input. 7. The wireless communication terminal further comprises means for inputting dial information as a push sound from a microphone, and means for converting the input push sound data into a control code. Alternatively, the wireless switching system according to item 6. 8. The wireless communication terminal further comprises means for enabling both input from a dial key and push sound from a microphone for each digit when inputting dial information for one communication. The wireless switching system according to claim 7, further comprising: 9. The communication between the main device and the wireless communication terminal,
10. The wireless switching system according to claim 5, wherein the wireless switching system is a wireless communication based on spread spectrum including a frequency hopping method and a direct spread method.