JPH09261765A - Radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication system in which waste of communication of a radio frame voice signal or data is avoided. SOLUTION: A voice channel and a data channel in a conventional radio frame are combined into one voice/data channel and a function to discriminate contents stored in the voice/data channel is provided. Thus, in the case of communication of a voice signal or data only, and in the case of voice communication, the voice/data channel is used for a voice channel and in the case of data communication, the voice/data channel is used for a data channel so as to avoid waste of communication by pseudo data thereby improving the communication efficiency of the radio communication system, and then the power consumption of a radio terminal equipment is reduced in the communication of one radio frame between radio terminal equipments.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system using, for example, a frequency hopping system.

[0002]

2. Description of the Related Art In a conventional wireless communication system, a centralized control station that manages and controls communication between terminals accommodated in the system, and a plurality of terminal stations are provided. , The wireless communication between the terminal stations has been performed based on the control data specified by the centralized control station.

FIG. 11 and FIG. 12 are explanatory views showing an example of a channel configuration inside a frame used in a conventional wireless communication system.

In FIG. 11, CNT indicates a system control channel, LCCH indicates a logical control channel, and 2
Voice data is exchanged bidirectionally using a certain voice channel, and END indicates a guard time for changing the frequency for frequency hopping in the next frame.

As shown in FIG. 12, in the frame used in the conventional system, the inside of the frame is CNT or LCC.
H, 2 voice channels, data channel, END 6
It consists of two channels.

[0006] In the conventional wireless communication system, such frames are used for communication between wireless terminals.

[0007]

However, in the wireless communication system shown in the above-mentioned conventional example, when the wireless frame has independent voice channel and data channel regions and only voice or data communication is performed, However, since a frame in which pseudo data is stored is communicated in an unnecessary data channel or voice channel, there is a disadvantage that wasteful communication is performed.

It is an object of the present invention to provide a wireless communication system capable of eliminating waste when communicating either wireless frame voice or data.

[0009]

According to the present invention, a voice channel and a data channel in a conventional radio frame are combined into one voice / data channel, which is stored in the voice / data channel in the radio frame. By providing a means for determining the contents that are present, when performing only voice or data communication, in the case of voice communication,
The voice / data channel is used as a voice channel, and in the case of data communication, the voice / data channel is used as a data channel to prevent wasteful communication due to pseudo data, and to perform communication in a wireless communication system. It is possible to improve the efficiency and reduce the power consumption of the wireless terminals in the communication of one wireless frame between the wireless terminals.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In this embodiment, a digital radio communication system based on a frequency hopping method will be described in detail. (System Configuration) FIG. 1 is an explanatory diagram showing the configuration of the wireless communication system of the present embodiment.

The present wireless communication system includes a central control station that manages and controls communication between terminals accommodated in the system,
It is composed of a plurality of terminal stations, based on control data specified by a central control station using a radio frame described later,
Terminal stations that perform communication perform wireless communication.

The centralized control station can be any one (or two or more) of the terminal stations in the system.

This wireless communication system uses a public line 102.
, And exchanges control data or voice data between the network control device 101 for providing a public network communication service to a terminal station in the system and this central control station or another terminal station. Make a voice call,
A wireless telephone 103 for performing a so-called extension call between a plurality of terminal stations, and a wireless data terminal 1 for performing control data communication and data communication between a central control station or another terminal station.
04-109.

In the following description, a wireless telephone,
Terminal stations such as wireless data terminals are collectively referred to as wireless terminals 110.
(General number of 104 to 109).

In the present embodiment, the wireless data terminal 104 is a terminal device (data terminal) or a data input / output device having a function of transmitting data in bursts, and a wireless adapter for wireless communication. , Or a terminal device integrating them, for example, a computer 104 and a multimedia terminal 1 shown in the figure.
05, printer 106, facsimile 107, copier 1
08, LAN gateway 109, electronic camera,
Devices such as video cameras and scanners are applicable.

A major feature of this system is that these wireless telephones 103 and wireless data terminals 104 can freely communicate with each other and can access the public network 102 at the same time.

The detailed configuration and operation will be described below. (1) Wireless Telephone FIG. 2 is a block diagram showing a configuration of the wireless telephone 103.

The main control unit 201 controls the entire radio telephone 103, and the memory 202 includes the main control unit 2.
01, a call code (system ID) of the wireless communication system, an EEPROM for storing a sub ID of the wireless telephone, and a main control unit 20.
1 is provided with a RAM or the like that provides a work area for control.

The communication path section 203 includes an input / output block for the handset 208, the microphone 209, and the speaker 210, and the ADPC.
The interface of the M codec 204 is provided.

The ADPCM codec 204 converts the analog voice signal from the speech path unit 203 into an ADPCM code and the ADPCM coded information into an analog voice signal.

The frame processing unit 205 performs processing such as scrambling on the ADPCM encoded information, and
Time division multiplexing is performed on a predetermined frame. The data assembled into a wireless frame, which will be described later, by the frame processing unit 205 is transmitted to the main device and the target terminal station via the wireless unit.

The radio control unit 206 transmits / receives data to / from the radio unit 207, switches frequencies, detects a carrier, detects a level,
It has a function to perform bit synchronization.

The radio section 207 modulates the digital information from the frame processing section 205, converts it into a format that can be transmitted wirelessly and sends it to the antenna, and demodulates the information wirelessly received from the antenna to convert it into digital information. Is.

The handset 208 is for inputting / outputting a voice signal for talking, and the microphone 209 is for collecting and inputting a voice signal. The speaker 210 loudspeaker-outputs the audio signal, and the display unit 211 displays the dial number input from the key matrix 212, the usage status of the public line, and the like. The key matrix 212 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.

The radio control unit 20 of the radio telephone 103
6 and the frame processing unit 205 can be configured by a channel codec board described later. (2) Wireless Adapter FIG. 3 is a block diagram showing an internal configuration of a wireless adapter connected to or incorporated in the wireless data terminal devices 104 to 109.

In the figure, 301 is a wireless adapter 3.
02 and a peripheral device such as a printer and a facsimile, which are connected via a communication cable or an internal bus.

The wireless unit 303 of the wireless adapter 302 exchanges wireless signals with the wireless units of other wireless adapters, and the details will be described later.

The main control unit 304 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 305 comprises a ROM for storing programs used by the main control unit 304, a RAM used as a buffer area for various processes, and the like.

The communication i / f unit 306 is a communication i / f that is standardly installed in the above-mentioned data terminal or peripheral device 301, for example, communication i such as RS232C, Centronics, LAN, etc.
/ F, an internal bus of a personal computer or a workstation, for example, an ISA bus, PCMCIAi / f
And the like to control the wireless adapter 302 to perform communication.

The timer unit 307 provides timing information used by each block inside the wireless adapter. The channel codec unit 308 not only assembles and disassembles radio frames as shown in FIG. 11, but also performs simple error detection processing represented by CRC, scramble processing, control of the radio unit 303, and the like.

The radio control unit 309 has a function of controlling transmission / reception switching of the radio unit 303, frequency switching, and the like, and also has a function of performing carrier detection, level detection, and bit synchronization.

The error correction processing unit 310 detects or corrects a bit or byte error that occurs in communication data due to various wireless environments. At the time of transmission, an error correction code is inserted in the communication data to convert the data into data. In addition to providing redundancy, an error position and an error pattern are calculated by a calculation process at the time of reception to correct a bit error generated in received data.

In such a wireless adapter 302, the communication i / f unit 306 can be composed of a PC board described later, and the channel codec unit 308 and the wireless control unit 309 are composed of a channel codec board described later. can do. (3) Network Control Device FIG. 4 is a block diagram showing the internal configuration of the network control device 101.

The main control unit 401 is responsible for overall control of the network control apparatus 101, and the memory 402 is a ROM for storing programs and call codes (system ID) of the present wireless communication system, and the main control unit 401. It is a memory configured from a RAM or the like that stores various data for control and provides a work area for various calculations.

The line i / f unit 403 is a public network line 102.
This is an interface unit that performs public network line control such as power supply for accommodating a communication, selection command transmission, DC loop connection, PCM conversion, selection command reception, and call command transmission.

The ADPCM codec section 404 converts the analog voice signal received by the line i / f section 403 via the public network 102 into an ADPCM code and transfers the ADPCM code to the channel codec section 405, and at the same time, the ADPCM from the channel codec section 405. The coded audio signal is converted into an analog audio signal.

The channel codec section 405 uses the ADPC.
The M-encoded information is subjected to processing such as scrambling, and is also time-division multiplexed into a predetermined frame. In this channel codec section 405, data assembled into a wireless frame described later is transmitted via the wireless section. This is transmitted to the control station and the target wireless terminal 110.

The radio control section 406 controls the transmission / reception switching and frequency switching of the radio section 407, and also has the functions of carrier detection, level detection, and bit synchronization.

The radio section 407 includes a channel codec section 4
The framed information from 05 is modulated and converted into a format capable of wireless transmission and sent to the antenna, and the information wirelessly received from the antenna is demodulated and processed into digital information. The detection unit 408 detects various tones such as incoming call detection, loop detection, PB signal, dial tone, and ring tone.

In the network control device 101, the line i / f unit 403 and the ADPCM codec unit 40 are used.
4 can be composed of a PSTN board described later, and includes a channel codec unit 405 and a radio control unit 406.
Can consist of a channel codec board. (4) Radio Unit FIG. 5 is a block diagram showing a radio unit having a configuration common to the radio terminals 110 of the present system.

The transmitting / receiving antennas 501a and 501b are
The switch 502 is for efficiently transmitting and receiving radio signals, and the changeover switch 502 is for changing over the antennas 501a and 501b. A band pass filter (hereinafter referred to as BPF) 503 is for removing a signal in an unnecessary band, and a changeover switch 504 is for switching between transmission and reception.

The amplifier 505 is a receiving system amplifier,
The amplifier 506 is a transmission system amplifier with power control. The converter 507 is a 1st. The IF is a down converter, and the converter 508 is an up converter.

The change-over switch 509 is for switching between transmission and reception, and the BPF 510 is for removing a signal in an unnecessary band from the signal converted by the down converter 507. The converter 511 is
2nd. This is a down converter for IF, and the two down converters 507 and 511 constitute a double-conversion reception mode.

The BPF 512 is 2nd. For IF,
The 90-degree phase shifter 513 sets the output phase of the BPF 512 to 90 degrees.
It is a phase shift. The quadrature detector 514
A signal received by the BPF 512 and the 90-degree phase shifter 513 is detected and demodulated. Further, the comparator 515 is for shaping the output of the quadrature detector 514.

Further, a voltage control type oscillator (hereinafter referred to as VCO) 516 and a low pass filter (hereinafter referred to as LPF)
517, and a PLL 518 including a programmable counter, a prescaler, a phase comparator, and the like.
And form a frequency synthesizer for the receiving system.

Further, a VCO 519 for generating a carrier signal
A PLL 52 including an LPF 520, a programmable counter, a prescaler, a phase comparator, and the like.
1 and 1 constitute a frequency synthesizer for hopping.

Further, the VCO 5 of the transmission system having the modulation function
22, a LPF 523, a PLL including a programmable counter, a prescaler, a phase comparator, and the like.
A transmission system frequency synthesizer having a frequency modulation function is constituted by 524.

The reference clock oscillator 525 includes various PLLs.
The reference clocks for 518, 521 and 524 are supplied, and the baseband filter 526 is a band limiting filter for transmission data (baseband signal).

(Structure and operation of PSTN board) PS
The TN board and the CHC board together with the network controller 101
Which has an interface for one PSTN line and controls outgoing / incoming calls to the PSTN line.

FIG. 6 is a block diagram showing the configuration of the PSTN board 1101.

In the figure, the PSTN line 1102 is
It is one line consisting of L1 and L2, and the control unit 1103
This PSTN board 1101 including PSTN line control
It also controls the entire network control device 101.
The ROM 1104 stores a control program of the control unit 1103, and the RAM 1105 stores various data for controlling the control unit 1103 and provides a work area for various calculations. Control unit 1
A reset circuit 1106 is connected to 103.

The control input / output circuit 1107 is for inputting / outputting the control signal of each part, and the call signal detection circuit 1108.
Is directly connected to the PSTN line 1102, and the ringing signal (16
Hz / 75V) is detected (ie, incoming call is detected)
Things. DC loop forming / DP sending circuit 1109
Is for closing the DC loop of the PSTN line 1102 and sending dial pulse (DP) for DP transmission.

The loss insertion circuit 1110 guarantees the line resistance of the PSTN line, and the 2-line / 4-line conversion circuit 1
111 is a two-line i / f of PSTN line integrated for transmission and reception
Is converted into 4-line i / f for which transmission and reception are separated.

The transmission circuit 1112 selects a signal source to be output to the PSTN line and amplifies the transmission signal. The receiving circuit 1113 selects a signal source to be output to the wireless terminal 110 that is a communication partner of the PSTN line and amplifies the received signal.

The hold tone generation circuit 1114 is a circuit for transmitting a hold tone to the PSTN line, and the DTMF generation circuit 1115 is a circuit for generating a DTMF (PB) signal for PB transmission.

The ADPCM codec 1116 performs A / D conversion of the received analog signal into an ADPCM signal and D / A conversion of the received ADPCM signal.
The 400 Hz detection circuit 1117 is a circuit for detecting a dial tone and a busy tone, and is an inter-board i / f circuit 1118.
Is a circuit for performing i / f with the channel codec board.

The basic PSTN line originating / receiving operation of the PSTN board 1101 will be described below.

1. At the time of calling, when the PSTN line calling request from the channel codec board is received via the inter-board i / f circuit 1118 based on the calling request to the PSTN line from the wireless terminal 110,
The control unit 1103 of the PSTN board forms a DC loop /
The DP transmission circuit 1109 is controlled to control the PSTN line 110.
A DC loop is formed for 2 to perform a call request operation,
A dial tone (400 Hz) sent from the PSTN line for the formation of the DC loop is transmitted through the DC loop forming / DP sending circuit 1109, the loss insertion circuit 1110, the 2-wire / 4-wire converting circuit 1111 and the receiving circuit 1113 to 400 Hz. After receiving in the detection circuit 1117 and confirming the 400 Hz detection notification from the 400 Hz detection circuit 1117, the control unit 1103 sends a dial signal based on the dial number transmitted from the channel codec board via the inter-board i / f circuit. Send out.

When the line type of the PSTN line is the DP line, the DC loop forming / DP sending circuit 1109 is controlled to set the dial number to ON / OFF of the DC loop of the PSTN line.
When it is turned off, it is sent out as DP (dial pulse). If the PSTN line type is PB line, DT
The MF creating circuit 1115 is controlled to control the transmitting circuits 1112, 2
The dial number is transmitted as a DTMF (PB) signal via the line / four-line conversion circuit 1111, the insertion loss circuit 1110, and the DC loop formation / DP transmission circuit 1109. After sending the dial signal, the control unit 1103 controls the DC loop formation / DP.
Sending circuit 1109, loss insertion circuit 1110, 2-wire / 4-wire converting circuit 1111, receiving circuit 1113, ADPCM codec 1116, inter-board i / f circuit 1118, and inter-board i / f circuit 1118, ADPCM codec 1116, transmitting circuit 1112, 2-wire / 4-wire conversion circuit 1
111, insertion loss circuit 1110, DC loop formation / DP
By forming the communication path of the sending circuit 1109, it is possible to transmit and receive a voice signal between the wireless terminal 110 of the communication partner wirelessly connected via the channel codec board and the PSTN line 1102.

2. When there is an incoming call from the PSTN line 1102, that is, when the calling signal detection circuit 1108 detects a calling signal indicating the incoming call and notifies the control section 1103, the control section 1103
Controls the channel codec board via the inter-board i / f circuit 1118 to PST the wireless terminal 110.
A control command indicating an incoming call notification from the N line is transmitted.
On the other hand, the channel codec board is the wireless terminal 1
When the control unit 1103 is notified of the incoming call response from the inter-board i / f circuit 1118, By forming a communication path similar to that at the time of calling, a voice signal can be transmitted and received between the PSTN line and the wireless terminal 110.

The above control operation will be described in more detail. The control section 1103 is a direct or control input / output circuit 1.
Each part is controlled via 107.

As described above, the originating / receiving control of the PSTN line is performed.

(Explanation of PC Board Structure and Operation) FIG.
3 is a block diagram showing the configuration of a PC board 1601. FIG.

The PC board 1601 is a PC board, CH
A CPU 1602 that controls the C board, and a CPU 16
ROM 1603 in which the control program No. 02 is stored,
RAM 16 used as a buffer area for various processes
04, and a communication interface unit 1605 for exchanging control data and transmission / reception data with a data terminal, a CHC board and the like.

The operation of the PC board will be described below.

When the communication interface unit 1605 of the PC board 1601 receives the control data and the CPU 1602 recognizes the content of the control data, the CPU 1602
It operates according to the control data.

When the communication interface unit 1605 of the PC board 1601 receives the transmitted / received data, the data is transferred to the RAM 1604, and the RAM 16 is also transmitted.
Communication interface unit 1605
To the CHC board, data terminal, etc.

FIG. 8 is a block diagram showing the structure of the communication interface section. The details will be described below with reference to this drawing.

The communication interface section 1701 has an address decoding section 1702 and a card attribute information section 1703.
And the card configuration register unit 1704
And a card interface register unit 1705.

The address decoding unit 1702 decodes an address from the CPU of the computer and an address of the CPU in the PC board. A selection signal is output to the card attribute information unit 1703, the card configuration register unit 1704, and the card interface register unit 1705 according to the content of the address.

Next, the card attribute information section 1703 is the PC
This is a part for storing information for initial setting of the card, which is read by the computer at the time of initial setting of the PC card, and sets the PCMCIA controller inside the computer and the card configuration register unit 1
The setting of 704 is performed. The card configuration register unit 1704 is a register for storing information about card configuration, reset, and card status. The PC board and computer can know the status of the card by reading this register. .

Card interface register unit 1705
Is an interface for transmitting and receiving commands and data between a computer and a PC board.

(Operation of Radio Frame) FIG. 9 is an explanatory diagram showing a channel configuration inside a frame used in this embodiment, and FIG. 10 is an explanatory diagram showing an internal configuration example of each channel.

First, in FIG. 9, CNT indicates a system control channel, LCCH indicates a logical control channel, and a voice / data channel is a channel for storing voice or data or voice and data. Also, FIG.
As shown in FIG. 0, the frame used in this embodiment has CNT, LCCH, voice / data channel, E inside the frame.
It is composed of four ND channels.

In FIG. 10, CS is 12.8 usec
Minute carrier sense time, PR is a 56-bit preamble for capturing bit synchronization, SYN is a 31-bit frame synchronization signal defined by 1 dummy bit + RCR, ID
Is a 63-bit call signal + 1 dummy bit defined by RCR, UW is a 24-bit unique word (for capturing byte synchronization), BF is 8-bit basic frame number information (1 to 20 cycles), and WA is a sleep mode. Field in which the system address of the terminal station to be activated is entered, NF is frequency information used in the next frame, Rev is an area number for distinguishing from adjacent cells,
GT is a guard time, CS0, CS1 and CS2 are carrier sense times, DA is a field for writing a system address, Line control channel Data is control command information, Data channel Data is data information for data transfer, and system control channel is CRC is BF ~ Rev
CRC information, CRC of the circuit control channel is CS
CRC information for 0-Data, CR of voice channel
C indicates CRC information for T / R, CF indicates guard time for frequency switching, and T / R indicates B channel information of 32 kbps.

The VT stores information indicating whether voice is stored in the voice / data channel. If the stored value is 1111, the voice / data channel includes voice, and if the stored value is 0000, the voice / data channel does not include voice. The DT stores information in the voice / data channel indicating whether data is included. If the stored value is 1111, the voice / data channel contains data, and if the stored value is 0000, the voice / data channel does not contain data. That is, VT = 1111, DT = 00
In the case of 00, the voice / data channel is composed of only the voice channel, and in the case of VT = 0000 and DT = 1111, the voice / data channel is composed of only the data channel, and in the case of VT = 1111, DT = 1111, The voice / data channel is composed of a voice channel and a data channel.

In the present embodiment, unlike the conventional frame format shown in FIG. 11, the voice channel and the data channel are not determined, and the voice channel and the data channel are combined into one channel (voice / data channel in FIG. 10). ), And by using DT and VT described above, selectively use voice and data to be stored in the voice / data channel,
When performing only voice or data communication, it is unnecessary to use the voice / data channel for the voice channel in the case of voice communication and the voice / data channel for the data channel in the case of data communication. The communication efficiency of the wireless communication system is improved by not performing such communication, and the power consumption of the wireless terminal is reduced in one communication of only voice and data. The numbers in the figure represent the number of bits, and show an example of the length of each part.

The central control station transmits the CNT channel at the start of each frame, and stations other than the central control station receive the CNT channel in order to establish bit synchronization and frame synchronization. The LCCH channel is used for connecting and disconnecting a line, exchanging a hopping pattern allocation request with the central control station prior to the line connection, and exchanging a hopping pattern allocation release with the central control station when the line is disconnected. For connection or disconnection of the line, the system address of the partner who desires communication is written in the DA field provided in the LCCH channel, and the line is directly exchanged with the partner.

One of the two voice channels is used for transmission and the other is used for reception to realize a voice call. Which of the two is to be used for transmission is determined by meeting with the other party on the LCCH channel that is exchanged when the line is connected. The data channel is an LCCH channel that is exchanged at the time of line connection, and an arrangement is made with the other party to determine how to perform data transmission.

(Frequency Hopping) FIG. 14 is an explanatory diagram showing an example of frequency hopping. In this figure, a system having eight base frames (hereinafter referred to as BF) and eight frequencies from F1 to F8 is used as an example. In each base frame, the frequencies used by the first HP, the second HP, and the third HP are shown. As shown in FIG. 14, each hopping pattern (hereinafter referred to as HP) does not use the same frequency in the same base frame, but always uses different frequencies. In addition, one frame includes one frame shown in FIG.
There is one, and each HP changes the frequency in a predetermined order every frame, that is, each time the base frame ends.

How the system performs frequency hopping will be described with reference to the drawings.

The hopping pattern in which the central control station transmits the system control channel is the first HP in FIG.
That is, F1 for BF1, F2 for BF2, BF
When it is 3, the frequency is changed for each BF, such as F3.

Although the frequency hopping has been described with reference to FIG. 14, the frequency hopping in the frame of this embodiment will be described below.

First, a hopping pattern in voice / data communication will be described with reference to FIG. That is, a case where voice and data are stored in the voice / data channel will be described.

As shown in FIG. 15, all wireless terminals 110 other than the central control station first set the frequency to be set in the radio section in BF1 in order to receive the system control channel transmitted by the central control station. HP of 1 sets to the frequency F1 used by BF1. All wireless terminals 110 other than the central control station establish frame synchronization with the system control channel received here.

The logical control channel for exchanging communication connection request and disconnection request is exchanged at the same frequency as the system control channel. A terminal having control data such as communication line connection or communication line disconnection to be transmitted on the logical control channel transmits control data to the other party directly on the logical control channel when the terminal is on the logical control channel.

The address of the destination wireless terminal is stored in DA of the logical control channel of the transmitting wireless terminal for transmitting voice and data, and 4 bits of 1111 are stored in VT and DT. A wireless terminal having the same address as DA of this logical control channel receives this logical control channel and
When T and DT recognize that VT = 1111, DT = 1111, it recognizes that voice and data are transmitted from the transmitting wireless terminal, and the central control station for voice and data in advance in the voice / data channel. To the frequency corresponding to the HP assigned by.

Of course, the transmitting wireless terminal for transmitting voice and data performs frequency hopping in the same manner as the wireless terminal receiving the logical control channel. At this time, the same HP as the system control channel and the logical control channel may be assigned depending on the assignment status from the centralized control station. In the example shown in FIG. 15, the second HP is assigned to the voice communication between the terminals AB and the third HP is assigned to the data communication between the terminals AB with respect to the first HP of the system control channel logical control channel. The following is an example. In the case of this example, therefore, the frequency is changed three times in one frame.

Next, FIG. 13 shows an example of details of voice communication between the terminals AB described in FIG. It shows a state in which the terminal A and the terminal B are communicating with each other on the first HP shown in FIG.
When the logical control channel ends, the terminal in voice communication
The frequency to be changed from the current base frame number is set in the radio unit according to the frequency hopping pattern assigned from the system control channel. In addition, communication control information such as which is transmitted on the first voice channel is exchanged with a communication partner in advance, and transmission and reception of the wireless unit are controlled based on the communication control information.

The case of BF1 will be described. When the logical control channel ends, the terminal A changes the frequency according to the frequency hopping pattern assigned to the voice communication.
As a result of changing the frequency, since the first HP is assigned to the terminals A and B, the frequency does not change. Terminal A sets the radio section for transmission, terminal B sets the radio section for reception, and exchanges voice data on the first voice channel. At the end of the voice channel, terminal A sets the radio section to reception, terminal B sets the radio section to transmission, and exchanges voice data on the second voice channel. At the end of the second voice channel, in preparation for the next data communication, each terminal sets in the radio unit a frequency hopping pattern assigned to the radio unit for the data communication and a frequency derived from the current base frame.

After the end of the data channel, during END, in order to receive the system control channel in the next BF2, F2, which is the frequency used in BF2 in the first HP, is set in the radio section. The procedure of frequency hopping after the base frame becomes BF2 repeats the above procedure.

Next, a hopping pattern in voice communication will be described with reference to FIG. That is, a case where only voice is stored in the voice / data channel will be described.

As shown in FIG. 17, all wireless terminals 110 other than the centralized control station first set the frequency set in the wireless section in BF1 in order to receive the system control channel transmitted by the centralized control station. HP of 1 sets to the frequency F1 used by BF1. All wireless terminals 110 other than the central control station establish frame synchronization with the system control channel received here.

The logical control channel for exchanging communication connection request and disconnection request is exchanged at the same frequency as the system control channel. A terminal having control data such as communication line connection or communication line disconnection to be transmitted on the logical control channel transmits control data to the other party directly on the logical control channel when the terminal is on the logical control channel. The address of the destination wireless terminal is stored in DA of the logical control channel of the transmitting wireless terminal that transmits voice, and 4 bits of 1111 are stored in VT and 0000 are stored in DT.

When the wireless terminal having the same address as the DA of this logical control channel receives this logical control channel and recognizes that VT and DT are VT = 1111, and DT = 0000, a voice is transmitted from the transmitting wireless terminal. Recognizing that it is transmitted, in the voice / data channel, it is changed to a frequency corresponding to the HP that was previously assigned by the central control station for voice.

Of course, the transmitting wireless terminal for transmitting voice performs frequency hopping in the same manner as the wireless terminal receiving the logical control channel. At this time, the same HP as the system control channel and the logical control channel may be allocated depending on the allocation status from the central control station. FIG.
In the example shown in FIG. 7, the second HP is used for the voice communication between the terminals AB for the first HP of the system control channel and the logical control channel.
The following shows an example in which the HPs are assigned. In the case of this example, therefore, the frequency is changed twice in one frame.

The details of the voice communication are the same as those described above.

Next, a hopping pattern in data communication will be described with reference to FIG. That is, voice /
A case where only data is stored in the data channel will be described.

As shown in FIG. 18, the front wireless terminal 110 other than the centralized control station first sets the frequency set in the wireless section in BF1 in order to receive the system control channel transmitted by the centralized control station. HP of 1 sets to the frequency F1 used by BF1. The front wireless terminals 110 other than the centralized control station establish frame synchronization on the system control channel received here.

The logical control channel for exchanging connection request and disconnection request for communication is exchanged at the same frequency as the system control channel. A terminal having control data such as communication line connection or communication line disconnection to be transmitted on the logical control channel directly transmits control data on the logical control channel to the other party during the logical control channel. The address of the destination wireless terminal is stored in the DA of the logical control channel of the transmitting wireless terminal that transmits voice, and 0000 is stored in VT and 1 is stored in DT.
Four bits of 111 are stored. A wireless terminal having the same address as DA of this logical control channel receives this logical control channel, and its VT and DT are VT = 0000 and D.
When T = 1111 is recognized, it is recognized that data is transmitted from the transmitting wireless terminal, and the voice / data channel is changed to a frequency corresponding to the HP that has been previously assigned by the central control station for data. .

Of course, the transmitting wireless terminal that transmits data performs frequency hopping similarly to the wireless terminal that receives the logical control channel. At this time, the same HP as the system control channel and the logical control channel may be allocated depending on the allocation status from the central control station. FIG.
In the example shown in FIG. 8, the second HP is assigned to the data communication between the terminals AB with respect to the first HP of the system control channel and the logical control channel. In the case of this example, therefore, the frequency is changed twice in one frame.

(Structure and operation of CHC board) Channel codec boards are roughly divided into a channel codec for assembling data into a predetermined frame format and disassembling frames, a radio section for performing modulation / demodulation, and digital encoding of voice. / Consists of an ADPCM codec for decoding.

FIG. 16 is a block diagram showing the internal structure of the channel codec board. In the figure, a channel codec 3101 is an ADPCM codec 3103 to which an audio input / output unit (headset) 3102 is connected.
And the wireless unit 3129.

Then, the channel codec 3101 is
A CPU bus interface 3105 to which the CPU bus 3104 is connected, an ADPCM interface 3106 to be connected to the ADPCM codec 3103, a mode register 3107 for setting an operation mode, a hopping pattern register 3108, a frame number / next frequency number (BF / NF) Register 3109 and System I
It has a D register 3110, an intermittent activation terminal address register 3111, an LCCH register 3112, and a FIFO buffer 3113.

The timing generator 3114 and the CN
T channel assembling / disassembling unit 3115, LCCH (logical control channel) assembling / disassembling unit 3116, data assembling / disassembling unit 3117, voice assembling / disassembling unit 3118, frame synchronizing unit 3119, unique word detecting unit 3120
, CRC encoding / decoding section 3121, bit synchronization section 3122, radio control section 3123, intermittent reception control section 3121
124, a scramble / descramble 3125,
An AD converter 3126 that converts an analog reception signal from the radio unit 3129 into a digital signal, and a reception level detection unit 312 that detects a reception level based on an input from the AD converter 3126 and outputs an interrupt signal 3128
And 7.

The operation of the channel codec board will be described below with reference to FIG.

The standard of the operation timing of the channel codec board is the central control station side channel codec 3101.
Is generated by the timing generation unit 3114. The central control station transmits a frame according to this timing, and the terminal station that has received the frame maintains frame synchronization according to a frame synchronization word.

The data sent from the central control station side through the CNT channel is stored in the register inside the channel codec 3101. An HP (hopping pattern) register 3108, I
There are a D register 3110 and a WA (starting terminal address) register 3111. At the central control station, the CPU writes necessary values to these registers. Also, in synchronization with the operation timing, the frame number / next frame frequency number (BF
/ NF) The value inside the register 3109 is updated. NF
The frequency number written in the register is the hopping pattern (first hopping pattern) of the CNT channel. The channel codec 3101 reads the data in these registers at the timing of transmitting the data of the CNT channel, assembles the data in the CNT assembling unit 3114, and sends the data to the radio unit 3129.

On the other hand, in the terminal station, radio section 3129
When the data is received through the CNT channel, the CNT is decomposed by the CNT decomposing unit 3114, and processing is performed using the received values of the respective units. Only when the received system ID matches the value written in the ID register 3108 of the own station, control is performed so as to receive the subsequent data. If the received WA matches the value of its own WA register 3109 during intermittent reception, a start request interrupt is generated. Further, the hopping pattern register 3110 is rewritten using the received BF and NF information data.

Since the frequency number assigned to the NF field is that of the hopping pattern of the CNT channel, the hopping pattern used for the voice channel and the data channel is the hopping pattern created based on the frequency number assigned to the NF field. The pattern register is generated by time-shifting.

In the LCCH channel, the transmitter side terminal 11
0 is the LCC inside the channel codec 3101
The data stored in the H register 3116 is LCCH assembled /
Assembled by the disassembly unit 3116 and transmitted to the wireless unit at a predetermined timing. The received LCCH data is LCC
After being disassembled by the H assembling / disassembling unit 3116 and temporarily stored in the LCCH register 3116 inside the channel codec,
An interrupt is generated for the CPU, and the CPU reads it.

In the voice channel, the voice input / output unit 3102
Is digitally encoded by the ADPCM codec 3103, and is taken into the channel codec 3101 via the ADPCM interface 3116. In the channel codec 3101, the data input in the voice assembling / disassembling unit 3118 is assembled and transmitted to the radio unit 3129 at a predetermined timing.

On the contrary, the voice data received from the radio section is
It is disassembled in the voice assembling / disassembling unit 3118,
The signal is output at the timing of the ADPCM codec 3103 via the M interface 3116,
It is output to 102.

On the data channel, data is transmitted only when the CPU makes a data transmission request. If a data transmission request has been made, the CPU of the channel codec
The bus interface 3105 outputs a DMA request at a timing of one byte. When data is written by the DMA controller in response to the DMA request,
The data assembling / disassembling unit 3117 converts the data into serial data and transmits the data to the wireless unit at a predetermined timing.

On the contrary, when the data is received, the data assembling / disassembling unit 3117 converts the data into parallel and outputs the DMA request for each byte, and
The controller transfers the received data to the memory. When the transfer of one frame of data is completed, an interrupt is generated for the CPU.

At the time of data transmission, the CRC code generation unit 3120 generates a CRC code as necessary, stores it in the CRC field and transmits it. The receiving side can check the CRC and detect the occurrence of an error. Also,
All transmission data other than the frame synchronization word and the unique word are scrambled by the scrambler 3124. This is to reduce the unbalance of the data sent to the radio unit and to facilitate the synchronization clock extraction.

On the contrary, when receiving a data, when the unique word is detected, the descrambler 3124
At the same time, a CRC check is performed, and at the same time, data is input to the decomposing unit of each field.

As described above, the voice and data are wirelessly transmitted in accordance with the predetermined frame.

(Operation of Centralized Control Station) In order for this wireless communication system to operate, the centralized control station manages the hopping frequency in the system, and the terminal station manages the hopping pattern (H
It is assumed that a communication channel determined by P: Hopping Pattern and a time slot is allocated from the central control station.

The central control station has the functions of changing the HP of the system, managing the intermittent reception status of the terminal stations, and registering the system of the terminal stations in addition to the management of each communication channel. The operation of the centralized control station when it becomes necessary to manage the communication channel and change the HP, which is the basis for performing the above, will be described. The management of the communication channel in the central control station is to allocate and release an unused HP to the data type (voice or data) of the communication requested from the terminal station.

First, communication channel management will be described.

FIG. 19 is an explanatory diagram showing the HP allocation sequence. This figure shows a sequence from when the terminal station requests an HP to the central control station to communicate with a specific communication partner station, until the communication ends and the HP is released.

The terminal station sends an HP allocation request 4101 to the centralized control station in order to start communication with a particular communication partner station. The HP assignment request 4101 includes the ID of the communication partner station.
And parameters such as data type. If there is an unused HP of the requested data type, the central control station sends an HP assignment 4102 to the terminal station.

The terminal station sends the assigned HP to the communication partner station to make a connection request. Then, if the connection permission is obtained from the communication partner station, the terminal station sends a connection completion notification 4103 to the central control station.

The central control station notifies the terminal station of the completion of connection 41.
The usage status of the assigned HP is confirmed and managed by the parameter 03, and a connection completion confirmation 4104 is sent to the terminal station.
After receiving the connection completion confirmation 4104, the terminal station thereafter communicates with the communication partner station using the assigned HP.

When the communication is completed, the terminal station disconnects the connection with the communication partner station and then sends an HP release request 4105 to the centralized control station. The central control station changes the usage status of the assigned HP, and sends an HP release confirmation 4106 to the terminal station. Upon receiving the HP release confirmation 4106, the terminal station ends the communication.

FIG. 20 is a flowchart showing HP allocation in the centralized control station. In this figure, the terminal station is H
The processing performed on the central control station side from the request of P to the start of communication is described.

Upon receiving the HP allocation request from the terminal station (S4201), the centralized control station confirms in the HP table whether or not there is an unused HP of the requested data type (S4202). If there is no unused HP, the terminal station is notified that there is no unused HP (S420).
Perform 4). If there is an unused HP, provisional registration (S4203) is performed in the HP table, and provisional HP allocation (S4205) is performed to the terminal station.

The centralized control station determines whether or not the terminal station has succeeded in connecting with the communication partner station on the HP temporarily assigned by the connection completion notification (S4206) from the terminal station (S420).
7) is confirmed, and if the connection is not successful, the HP of the temporary assignment is registered unused in the HP table (S4209),
If the connection is successful, the provisionally assigned HP is registered for use in the HP table (S4208). The central control station
After the use status is registered in the table, a connection completion confirmation is sent to the terminal station (S4210), and the requested HP assignment is terminated.

FIG. 21 is a flow chart showing HP release in the centralized control station. This figure describes processing performed on the central control station side in the procedure of releasing the assigned HP after the communication has been completed at the terminal station.

Upon receiving the HP release request from the terminal station (S4301), the centralized control station confirms the terminal ID included in the parameter and the HP of the release request (S4302). If the HP of the release request is not a normally assigned HP, the terminal station is notified by an error notification (S4304) and the HP is not released. If the HP of the release request can be confirmed normally, it is not registered in the HP table (S43).
03) and confirms the HP release to the terminal station (S430
Send 5).

As described above, in the present system, the centralized control station has the HP table unique to the system, and the allocation of the communication channel of the communication between the terminal stations is realized by the centralized control station allocating the HP. The central control station manages all communications in the system.

Next, the operation of the centralized control station when changing the HP will be described.

This is because when a frequency with HP communication becomes unusable due to a failure such as interference in a narrow band, the unusable frequency is replaced with an unused frequency and HP is changed to avoid the failure. It is a function. There are two ways to change the HP: a case where a change request comes from the terminal station and a case where the central control station directly performs the change. In response to these requests, the centralized control station changes the hopping frequency table and changes the NF (Next Freq) in the system control channel that is transmitted for each frame.
system) to notify each terminal station of the HP change of the system.

FIG. 22 is a flow chart showing the HP change in the centralized control station.

Upon receiving the HP change request from the terminal station, the centralized control station confirms the necessity of HP change (S440).
1). If the necessity is not recognized, the HP is not changed. If the necessity is recognized, the presence or absence of the alternative HP is confirmed (S4402). If there is no alternative HP, the HP is not changed. If there is an alternative HP, the hopping frequency table is changed, the NF in the system control channel is changed, and each terminal station is notified.

When the central control station directly changes the HP, it is confirmed whether or not there is an alternative HP (S4402). Alternative H
If P does not exist, HP is not changed. If an alternative HP exists, the hopping frequency table is changed, the NF in the system control channel is changed, and the terminal stations are notified.

In this way, in this system, the central control station manages and changes the HP according to the request from the terminal station or the request of the central control station itself.

The specific operation of this system will be described below in some cases.

[0141] 1. Processing at power-on (1) Sequence of control station and terminal station at power-on FIG. 23 is a sequence showing the operation of the control station and terminal station at power-on in the present system.

When the power is turned on in step S5101 and the terminal is initialized, the terminal determines whether it is the centralized control station or the terminal station and recognizes that it is the centralized control station. , Determine the hopping pattern, sync signal,
Hopping pattern information, own area number, etc. are assembled into a frame, and output as a CNT frame at every predetermined timing.

Similarly, when the terminal recognizes that it is a terminal station after the terminal is started up, the address of the terminal itself and the area number of the receiving control station are stored. When this process is completed, a CNT frame from the control station is waited at an arbitrary frequency. When receiving the CNT frame from the central control station,
The frequency that hops to the next unit time is acquired based on the NFR in this frame. The terminal station changes the reception frequency based on the received frequency and waits for the next CNT frame. The terminal station repeats this process, recognizes the hopping pattern used by the centralized control station, and stores it.

When the storage of the hopping pattern is completed in the terminal station, the terminal station notifies the terminal station that it will newly join as a terminal station using the LCCH frame in step S5102. At this time, the DA of the LCCH frame is set to the global address received by all terminals, and the data section is set to the data indicating that new registration is to be performed, and is transmitted.

The central control station receives the LCCH frame, receives the data in the data section when the DA in the LCCH frame has a global address, and based on this information when the address of the terminal station and the registration request signal are received. The terminal station address is stored in and is newly registered.

When this registration is completed, the centralized control station notifies the terminal station newly registered in S5103 of the address of the centralized control station using the LCCH frame. When the terminal station receives the address of the control station in the LCCH frame, the terminal station stores the address of the control station.
In 5104, the centralized control station is notified of the start-up completion using the LCCH frame. When the centralized control station receives the startup completion notification from the terminal station, it shifts to normal processing.

At the terminal station, after the start-up completion notice is output, the call from the terminal station becomes possible in S5105.

(2) Operation at Power-up in Central Control Station FIG. 24 is a flowchart showing the operation at power-on in the central control station.

When the power of the terminal is turned on in S5201,
In step S5202, the terminal is initialized and put into an operating state. As a result of this processing, when it is recognized that the terminal is the centralized control station in S5203, the processing for storing the address information and area information of the own terminal is performed in S5204. Means for inputting the area information and the terminal address information include a case where a value set by a DIP switch or the like at the time of startup is stored, a case where a value input by a dial key of a telephone or the like is stored, or a computer. For example, it is conceivable to receive a value input from a keyboard such as a keyboard via a bus and store it.

When this address information is received,
It is determined whether the value input in S5205 is valid,
If the address information is not valid, a process of storing the address information is performed again in S5204.

When it is confirmed that the address stored in S5205 is valid, a process for determining the hopping pattern to be used in S5206 is performed. At this time, the central control station carries out carrier sensing on all available frequencies, and selects a predetermined number of frequencies having the best radio wave condition from among them as a hopping pattern.

As a result of acquiring the hopping pattern in S5207, if the usable frequency is less than the predetermined number, it is detected in S5211 whether carrier sensing is performed for a predetermined time. And if you have not done it for a predetermined time,
The processing for determining the hopping pattern is continued in S5206. When it is detected in S5211 that a predetermined time has elapsed, the central control station notifies in screen display or sound that the hopping pattern could not be determined in S5212.

After this processing, if there is a request to determine the hopping pattern again in S5213, the processing for determining the hopping pattern is performed in S5206. S52
If there is no request for retry in 13, it is notified in S5212 that the hopping pattern cannot be determined.

When the predetermined hopping pattern can be acquired in S5207, the process for assembling the CNT frame is performed in S5208. CNT frame is sync signal I
It is a frame including D, area number, and frequency information.

When the assembly of this CNT frame is completed,
The process of transmitting the CNT frame is performed using one frequency of the hopping patterns determined in S5210, and the process shifts to the normal process of transmitting the CNT frame while changing the frequency based on the HP determined in S5211.

(2) Operation at the time of new terminal registration in the centralized control station FIG. 25 is a flowchart showing the operation at the time of new terminal station registration in the centralized control station.

During normal processing in S5301, S5302 is executed.
When the centralized control station receives the LCCH frame and the DA includes the address addressed to the own terminal or all terminals, the central control station extracts the control data in the received LCCH frame and executes the instruction.

If it is confirmed that the control data received in S5303 is a registration request from a terminal station, a confirmation process of the terminal station address transmitted together with the registration request is performed in S5304. As a result of the terminal station address confirmation, if it is detected in S5305 that the terminal station address is normal, S5306
At the centralized control station, the processing for registering the terminal station address is performed and the address information is stored.

When it is detected in S5305 that the terminal station address is not normal, a process for discarding the registration request received in the LCCH frame is performed in S5310, and S5 is executed again.
At 301, normal processing is performed.

When the terminal station registration is completed in S5306,
In step S5307, the address of the centralized control station is entered in the DATA section using the LCCH frame, and the address of the terminal station is entered in DA and transmitted to the terminal station that has completed registration.

After transmitting the central control station address in S5307, if the startup completion notification signal using the LCCH frame from the terminal station whose registration has been completed in S5308 cannot be confirmed, it is detected in S5311 whether a predetermined time has elapsed.
If the predetermined time has not passed, the start-up completion notification using the LCCH frame from the terminal station is waited for in S5308.

If a predetermined time has passed after the central control station address was notified to the terminal station in S5311, S5307
Performs a process for notifying the terminal station of the central control station address using the LCCH frame again. S5308
When the startup completion notification signal from the terminal station is detected in step S5309, new registration completion processing of the terminal station is performed in step S5309, and normal processing is performed.

(3) Operation at Power-on of Terminal Station FIG. 26 is a flowchart showing the operation at power-on of the terminal station.

When the power of the terminal is turned on in S5401,
In step S5402, the terminal is initialized and put into an operating state. As a result of this processing, when it is recognized that the terminal is a terminal station in S5403, processing for storing the address information and area information of the own terminal is performed in S5404. The terminal station, centralized control station determination means, and area information and terminal address information input means include DIP at startup.
It is possible to store the value set by a switch etc., the value input by the dial key of a telephone, etc. or the value input by the keyboard of a computer etc. via the bus and store it. Conceivable.

When the address information is read, S5
In 405, it is determined whether or not the input value is valid, and if it is not valid, the process of storing the address information is performed again in S5404.

If it is confirmed that the address stored in S5405 is valid, a process for acquiring the hopping pattern used in S5406 is performed.

In S5406, the CNT from the central control station
In order to receive a frame, it shifts to a reception standby state at an arbitrary frequency. If the CNT frame from the centralized control station can be received at that frequency, the area number is recognized from the Rev section in the CNT frame and the area number is compared with the area number stored in the own terminal.

If the area numbers match, CN
The frequency for hopping in the next unit time is acquired from the NFR part in the T frame, the terminal station moves the received frequency to that frequency, and waits for the next CNT frame. The terminal station repeats this operation, recognizes the centralized control station to which it belongs, recognizes the frequency hopping pattern, and stores it.

As a result of the hopping pattern acquisition processing in S5406, if the hopping pattern cannot be acquired in S5407, a warning sound or screen display is used to notify the user that the hopping pattern could not be acquired in S5413. Then, the process is performed for the user, and the process for acquiring the hopping pattern is performed in S5406.

When the acquisition of the hopping pattern is detected in S5407, the processing for notifying the central control station of the address of the terminal station is performed using the LCCH frame in S5408. Here, using the LCCH frame, a global address received by all terminals is written in DA in this frame, a registration request and its own terminal address are placed in the DATA section and transmitted to the control terminal.

After transmitting this signal, the terminal station receives the LCCH frame while changing the frequency according to the hopping pattern acquired in S5409. If the DA in the LCCH frame received in S5410 cannot be confirmed to have the same address as that of the own terminal, in S5414 it is monitored whether or not a predetermined time has elapsed after the address of the own terminal was transmitted.

Here, if the predetermined time has not elapsed,
The processing for receiving the central control station address in the LCCH frame from the central control station is continued. Also, S5414
When it is detected that a predetermined time has passed in step S5408, L
Processing for notifying the control terminal of its own terminal address is performed again using the CCH frame.

At S5410, the own terminal address is detected in DA in the LCCH frame from the centralized control station, and
If the data indicating the registration is confirmed in the DATA part, S54
At 11, the address of the centralized control station is placed on the DA of the LCCH frame, and the signal indicating the completion of startup is placed on the DATA section, and the LCCH frame is transmitted to the control terminal. When the output of this signal is completed, the process proceeds to the intermittent reception process in S5412.

2. 27. Processing at the time of making an outside line from a wireless terminal FIG. 27 is an explanatory diagram showing an outside line calling sequence of the present embodiment. Further, FIG. 28 is a flowchart showing the operation of the wireless terminal 110 at the time of making an outside line in the present embodiment,
FIG. 29 is a network control device 1 at the time of making an outside line in this embodiment.
It is a flow chart which shows operation of 01.

[0175] In the wireless terminal 110, when the placed outgoing key is pressed or the outgoing operation is performed by a combination of off-hook or the like and the dial (YES in S5801), the wireless terminal 110 acquires the HP (hopping pattern) required for the wireless communication. Therefore, the HP acquisition request (5601) is transmitted to the centralized control station (S5802). This HP
A wireless communication type (voice / data) is attached to the acquisition request as a parameter. In this operation, voice is used as a parameter.

Upon receiving the HP acquisition request, the centralized control station selects a different HP depending on the type and sends an HP notification (560
2) Notify the wireless terminal 110. Wireless terminal 11
In 0, when the HP notification is received (S5803), the HP is stored and the connection request (5603) is transmitted to the network control device 101 using the HP (S5804).

Upon receiving the connection request (YES in S5701), the network controller 101 checks the state of the wireless line,
If the connection is possible, a connection confirmation (5604) is transmitted (S5702). When the connection confirmation is received (S580
5) The wireless terminal 110 recognizes that the link probability of the wireless line is permitted, synchronizes with the voice channel, and transmits an outside line call (5606) to the network control apparatus 101 (S580).
6), the voice call path is connected and the call is in progress (S580
7). The dial of the other party is put as a parameter in this outside line transmission, and it is transmitted on the radio link between the radio terminal 110 and the network control device 101 by LCCH of the radio frame shown in FIG.

Upon receiving the outside call (5606), the network control device 101 determines whether the outside call is possible. If the public network line is free and transmission is possible, the public network 102 is captured (S5704). Then, after capturing, when a dial tone (5607) from the public network 102 is detected, a dial (56 from the wireless terminal 110 for making an outside line call is detected.
08, 5609) is started to be transmitted to the public network 102 (S5
705).

When all digits have been transmitted and the dial transmission is completed (S5706), the communication path with the public network 102 is connected to establish a communication (S5708). When the public network 102 receives the dial and calls the other party, a ringback tone (5610) is transmitted from the public network 102 and can be heard by the wireless terminal 110. When the other party answers, the ringback tone stops and the call is in progress (5611).

When the call ends and the wireless terminal 110 disconnects (eg, on-hook) (S5808), the on-hook (5612) is transmitted (S5809). This on-hook is received by the network control device 101 (S570
9), the network control device 101 disconnects the public network 102 (S
5711) and disconnection confirmation (5613) are transmitted to the wireless terminal 110 (S5711).

Upon receiving the disconnection confirmation, the wireless terminal 110 releases the communication path (S5810) and transmits an HP release request (5614) to the central control station to release the wireless line (S5811). When the central control station normally receives the HP release request and performs the HP release processing, it transmits the HP release (5615). Upon receiving the HP release (S5812), the wireless terminal 110 ends the process.

The above is the operation of the network control device 101 and the wireless terminal 110 at the time of making an outside line call. For example, the dial is not transmitted all at once as an outside line call but is divided after the outside line call to make network control. It may be transmitted to the device 101. Further, when the wireless terminal 110 continuously makes an outside line call, the last HP release request is not transmitted, and the same H
You may use P continuously.

3. Processing at the time of outside line incoming to wireless terminal [Operation of network control device] FIG. 30 is an explanatory diagram showing an outside line incoming sequence in this embodiment, and FIG. 31 is a network control device 101 at the time of outside line incoming in this embodiment. 3 is a flowchart showing the operation of FIG.

First, when there is an incoming call (6101) from the public network 102 in S6201, the process proceeds to S6202, in which the network control device 101 makes a request (6102) to the central control station for an HP to be used for a call. Upon receiving the request for the HP, the centralized control station selects an HP that is not currently used from the HP table managed by the centralized control station, and the network control device 101
The HP to the network control device 1 (6103).
01 receives the HP information in S6203.

Next, in S6204, the network controller 10
1 transmits an external line incoming signal 6104 to the wireless terminals 110A and 110B.

The wireless terminal 110 (A) goes off-hook, and the network control apparatus 101 sends an off-hook signal (610) at S6205.
When 5) is received, the process proceeds to S6202, and a connection request signal 610 carrying information such as HP used for outside line communication is sent to the wireless terminal 110 (A) which has transmitted the off-hook signal.
Send 6.

When the connection confirmation signal 6107 is received in S6207, the process advances to S6208 to notify the centralized control station that the connection with the wireless terminal 110 is completed (6108), and in S6209 the wireless terminal 110 ( While transmitting the call display signal 6109 to (A), the process proceeds to S6210, and the other wireless terminal 110 (here, the wireless terminal 11).
0 (B)), an external line termination cancellation signal 6110 is transmitted. Then, in step S6211, the wireless terminal 110 (A)
Is connected to the public network 102 to start a call.

Further, the network control apparatus 101 determines in step S6212.
Then, the connection with the public network 102 is continued until the on-hook signal 6111 is received from the wireless 110 (A). When the on-hook signal 6111 is received, the processing proceeds to step S6213, the line disconnection signal 6112 is transmitted, and the public network 102 and the wireless terminal 110 are transmitted.
Stop the connection of (A). Further, in S6214, the outside line busy display stop signal 6113 is transmitted to the other wireless terminal 110 (B).

Finally, the network control device 101 uses the HP used in the call to the central control station in S6215.
The central control station updates the HP management table and notifies the network control apparatus 101 that the HP has been released (S6216, 6115).
I do.

[Operation of Radio Terminal] FIG. 32 is a flow chart showing the operation of the radio terminal 110 when an outside line is called in this embodiment.

First, when the outside line incoming signal 6104 is received from the network control device 101 in step S6301, the wireless terminal 110 sounds a ringing tone or the like, and detects in step S6302 whether or not the terminal is off-hooked. Here, the wireless terminal 110 (A)
When the off-hook signal is received in step S6303, the process proceeds to step S6303 and the off-hook signal 6105 is transmitted to the network control device 101. If the connection request signal 6106 including information such as HP is received from the network control device 101 in step S6304, step S630 is performed.
At 5, the connection confirmation signal 6107 is returned.

When the call control signal 6109 is received from the network control device 101 in step S6306, the wireless terminal 110 (A)
A call display is displayed on the display unit, and the call is started in S6307. Further, the call is continued until the on-hook is performed in S6308, and when the on-hook is performed, the process proceeds to S6309, and the on-hook signal 6111 is transmitted to the network control device 101. Then, in S6310, the line disconnection signal 611.
When the number 2 comes, the line is disconnected, the in-call display on the display unit is turned off, and the call is ended.

In step S6311, the wireless terminal 11
Before 0 is off-hook, another wireless terminal 110
Since (A) has started a call, wireless terminal 110 (B)
When the external line termination cancellation signal 6110 is received, the wireless terminal 110 (B) proceeds to S6312, and the wireless terminal 11
The outside line is displayed on the 0 display.

Further, the wireless terminal 110 (B) is set to S63.
The external line busy display is continued on the display unit until the external line busy display stop signal 6113 arrives at 13, and when the signal comes, the external line busy display is erased at S6314.

4. Processing of Extension-to-Extension Call Next, assuming the case where an extension-to-extension call (voice communication) is made between two terminal stations, the operation of each of the calling-side wireless telephone and the called-side wireless telephone will be described. Two wireless phones 1
In the case of making an extension call at 03, the calling side is 103-A and the called side is 103-B).

FIG. 33 is an explanatory diagram showing a sequence of control data of the centralized control station, the terminal station A (calling side), and the terminal station B (calling side), and FIG. 34 shows the processing of the centralized control station. It is a flowchart which shows an outline. Further, FIG. 35 is a flowchart showing an outline of the processing of the calling terminal station.
6 is a flowchart showing an outline of the processing of the called terminal station. However, each figure mainly shows the part of the processing related to the present invention.

When the extension key arranged in the key matrix 211 is pressed in the wireless telephone 103-A (S
6801), the wireless telephone 103-A transmits the HP acquisition request signal (6601) by the HP of the centralized control station using the LCCH (S6802).

When the centralized control station judges that a signal has been received (S6701) and judges that the signal is an HP acquisition request (S6702), it checks whether there is an HP resource (S6705), and if there is a request, it makes a request. On the other hand, the HP is secured (S6706), and the HP is notified (S6707).

The wireless telephone set 103-A sends the HP notification (66
02) is received (S6803), communication is possible, and a dial tone (DT) is heard from the wireless telephone itself to the user (S6804). If the centralized control station determines in S6705 that there are no resources, the centralized control station issues a communication disable notification (S6708), and the wireless telephone 103-A that has received the notification indicates that the user cannot communicate. Is notified by sound or display (S6818).

Radio telephone 103 that heard the dial tone
The user of -A inputs information (address) representing the wireless telephone 103-B, which is the call destination, from the key matrix 211 (stop dial tone). Then, it waits for the other party to be designated (S6819), and the wireless telephone 103-A.
Is a wireless telephone using the LCCH on the HP of the central control station 1
A connection request (6603) is transmitted to 03-B (S680).
5). At that time, the HP information received from the central control station is also notified.

The radiotelephone 103-B is the H of the central control station.
Waiting for reception at P and receiving a connection request (S69
01), to the other party (calling side) that sent the request signal,
A connection confirmation (6604) is transmitted on the HP of the centralized control station using the LCCH (S6902). After this, the wireless telephone 103-B receives the H notification from the wireless telephone 103-A.
Switch HP to communicate using P.

Upon receiving the connection confirmation (S6806), the wireless telephone set 103-A sends a connection completion signal (6) to the central control station.
605) is transmitted on the HP of the centralized control station using the LCCH (S6807), and the centralized control station knows that a wireless link has been established between the extensions.

When the wireless link is established between the extensions, the wireless telephone 103-A sends the HP to the H which is notified from the central control station.
It switches to P and transmits a call setting (6606) signal to the wireless telephone 103-B. This signal is also wireless telephone 1
It is transmitted with the address of 03-B (S6808), and a ring back tone (RBT) is heard from the speaker 210 to inform the user that a call is being made (S682).
0).

The radio telephone number information 103-B on the called side is
When the call setting is received (S6903), a sound (ring tone) from the speaker 210 and a display for notifying the incoming call are displayed on the display unit 211 (S6910) to prompt the user of the wireless telephone 103-B to respond.

When the user of the wireless telephone 103-B makes a response operation using the key matrix 212 (S6911), the wireless telephone 103-B transmits the response (6607) with the address of the wireless telephone number information 103-A. Do (S
6904). At this point, wireless telephone number information 103-B
Enters the call state (S6905), stops the notification of the incoming call, turns on the speaker 210 and the microphone 209, and prepares for the call. The address of the wireless telephone 103-A of the caller may be displayed on the display unit 211 here.

On the other hand, when the radio telephone 103-A receives the response (6607) from the radio telephone 103-B (S607).
6809), the ringback tone is stopped, and the speaker 2
10, the microphone 209 is turned on, and the call is in progress (S68
10).

The radiotelephone set 103-A monitors whether the user performs a call end operation such as on-hook or receives a release from the radiotelephone set 103-B (S681).
1) Also, the wireless telephone 103-B also monitors whether the user has performed an operation to terminate the call, such as on-hook, or has received a disconnection from the wireless telephone 103-A (S69).
06).

When the user of the wireless telephone 103-A performs an operation for ending the call, the wireless telephone 103-A disconnects (66
08) is transmitted (S6812), and the microphone 209 and the speaker 210 are turned off. Upon receiving the disconnection, the wireless telephone 103-B turns off the microphone 209 and turns on the speaker 21.
0 stops the voice output from the other party and outputs a busy tone instead to notify that the other party hangs up (S69
12) The user is urged to take the wireless telephone 103-B off hook as well. Waiting for the user of the wireless telephone 103-B to perform the off-hook operation (S6913), the wireless telephone 103-B transmits release (6609) (S690).
7) End the call.

Upon receiving the release (S6813), the wireless telephone set 103-A determines that the call is completely terminated, and then transmits a release request (6610) to disconnect the wireless link (S6814).

The radio telephone 103-B requests the release (66
10) is received (S6908), release confirmation (661)
1) is transmitted (S6909), the transmission of radio waves is stopped, and the wireless link is disconnected.

The radiotelephone 103-A confirms the release (66
11) is received (S6815), the HP is switched to the HP of the centralized control station, and the HP release request (6612) used for the centralized control station is transmitted (S6816), and the centralized control station issues the release request. If it is determined that it has been received (S6703), the HP is released, and an HP release notification (6613) is transmitted to the wireless telephone 103-A (S6704). The wireless telephone 103-A receives the HP release notification (S681).
7) The wireless link is disconnected, the transmission / reception of radio waves is stopped, and the communication is terminated.

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

5. Data Communication Process Between Wireless Terminals FIG. 37 is an explanatory diagram showing a data communication sequence in the present embodiment. 38 is a flowchart showing the operation of the wireless terminal 110 at the time of connection in data communication in this embodiment, and FIG. 39 is a flowchart showing the operation of data transmission of the communication terminal in this embodiment. Further, FIG. 40 is a flowchart showing the data receiving operation of the communication terminal in the present embodiment, and FIG.
6 is a flowchart showing an operation of the wireless terminal 110 when disconnecting in data communication in the present embodiment.

When a transmitting operation is performed in the transmitting terminal station of the wireless terminal 110 (S7701), an HP acquisition request 7601 is transmitted to the centralized control station (S7702). When the HP notification 7602 is received from the centralized control station (S7703), the connection request 7603 is transmitted to the receiving terminal station and the HP used for communication is notified (S7704).

When the connection confirmation 7604 is received from the receiving terminal station (S7705), the connection completion 7605 is transmitted to the centralized control station and the call connection is terminated (S7706). Then, when the call connection is completed, data communication is performed. In this embodiment, data transmission from a transmitting terminal station will be described.

When the communication is started, the transmitting terminal station first resets the transmission counter to 0 (S7801). Next, it is checked whether there is a retransmission request from the wireless side (S78).
02) If not, it is checked whether there is a data transmission request from the terminal next (S7807).

When there is a transmission request, the requested data number is put in the transmission counter (S7808), and the data 7606 having the number in the transmission counter is transmitted (S7).
809). Here, if a retransmission request 7607 is received, the retransmitted data number is specified (S7803), and the data of the specified number is transmitted (S7804).

If the designated data number is smaller than the transmission counter data (S7805), the next designated data is designated (S7806), and the designated data is transmitted (S7804). If the number of the designated data matches the number of the transmission counter (S780)
6) Return to the normal transmission state. If a disconnection request is received from the terminal (S7810), the transmission ends.

When the communication is started, the receiving terminal station first resets the reception counter to 0 (S7901). When the data is received (S7902), it is checked whether the data is broken (S7903). If the data is not corrupted, then check the data number (S790
4) It is checked whether the data number is next to the reception counter number (S7905).

If the data has been received in the correct order, the data is sent to the terminal (S7907), and the data number is placed in the reception counter (S7908). Also,
If the data is corrupted or missing and the data cannot be received in order, a retransmission request 7607 is transmitted (S7906). When a disconnection request is received from the wireless device (7909), the reception is terminated.

When the calling terminal station receives a disconnection request from the terminal and enters the disconnection phase (S8001), it sends a line disconnection notification 7608 to the receiving terminal station (S8002), and when a line disconnection confirmation 7609 comes (S8003), To release the HP used for the centralized control station, the HP release 7610 is transmitted (S8004). When the HP release confirmation 7611 comes, the disconnection ends.

As described above, the means for determining the contents stored in the voice / data channel in the radio frame by combining the voice channel and the data channel of the conventional radio frame into the voice / data channel. By providing a voice or data communication, the voice / data channel is used as a voice channel in the case of voice communication, and the voice / data channel is used as a data channel in the case of data communication. The communication efficiency of the wireless communication system can be improved, and the power consumption of the wireless terminals can be reduced in the communication of one wireless frame between the wireless terminals.

[0223]

As described above, according to the present invention,
It is possible to improve the communication efficiency of the wireless communication system and reduce the power consumption of the wireless terminals in the communication of one wireless frame between the wireless terminals.

[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 an internal configuration of the wireless telephone according to the embodiment.

FIG. 3 is a block diagram showing an internal configuration of the wireless adapter of the embodiment.

FIG. 4 is a block diagram showing an internal configuration of the network control device of the embodiment.

FIG. 5 is a block diagram showing an internal configuration of a wireless unit of the above embodiment.

FIG. 6 is a block diagram showing an internal configuration of the PSTN board of the above embodiment.

FIG. 7 is a block diagram showing an internal configuration of the PC board of the above embodiment.

FIG. 8 is a block diagram showing an internal configuration of a communication interface unit of the above embodiment.

FIG. 9 is a block diagram showing a channel configuration inside a frame in the embodiment.

FIG. 10 is a block diagram showing an internal configuration of each channel of the above embodiment.

FIG. 11 is a block diagram showing a channel structure in a conventional frame.

FIG. 12 is a block diagram showing an internal configuration of each conventional channel.

FIG. 13 is an explanatory diagram showing an example of hopping and a transmission / reception state of a voice channel according to the above embodiment.

FIG. 14 is an explanatory diagram showing an example of frequency hopping in the embodiment.

FIG. 15 is an explanatory diagram showing a frequency usage state of each channel in the terminal-to-terminal voice / data communication of the embodiment.

FIG. 16 is a block diagram showing a configuration of a channel codec board of the above embodiment.

FIG. 17 is an explanatory diagram showing a frequency usage state of each channel in the inter-terminal voice communication of the above-described embodiment.

FIG. 18 is an explanatory diagram showing a frequency usage state of each channel in the terminal-to-terminal data communication of the embodiment.

FIG. 19 is an explanatory diagram showing an HP allocation sequence of the above embodiment.

FIG. 20 is a flowchart showing the HP allocation operation of the above embodiment.

FIG. 21 is a flowchart showing the HP release operation of the above embodiment.

FIG. 22 is a flowchart showing the HP changing operation of the above embodiment.

FIG. 23 is an explanatory diagram showing a power-on sequence between the centralized control station and the terminal station of the above embodiment.

FIG. 24 is a flow chart showing an operation at power-on in the centralized control station of the above embodiment.

FIG. 25 is a flowchart showing an operation at the time of newly registering a terminal station in the centralized control station of the above embodiment.

FIG. 26 is a flowchart showing an operation when the power is turned on in the terminal station of the above embodiment.

FIG. 27 is an explanatory diagram showing a sequence when an outside line is transmitted in the above-described embodiment.

FIG. 28 is a flowchart showing an operation of the network control device at the time of making an outside line in the above embodiment.

FIG. 29 is a flowchart showing an operation of the wireless terminal device when an outside line is called in the above embodiment.

FIG. 30 is an explanatory diagram showing a sequence when an outside line is called in the above embodiment.

FIG. 31 is a flowchart showing the operation of the network control device when an outside line is received in the above embodiment.

FIG. 32 is a flowchart showing an operation of the wireless terminal device when an outside line is called in the above embodiment.

FIG. 33 is an explanatory diagram showing a sequence of control data of the centralized control station, terminal station A (calling side), and terminal station B (calling side) in the above embodiment.

FIG. 34 is a flowchart showing an outline of processing of the centralized control station of the above-mentioned embodiment.

FIG. 35 is a flowchart showing an outline of the processing of the calling terminal station of the above embodiment.

FIG. 36 is a flowchart showing an outline of the processing of the called-side terminal station of the above embodiment.

FIG. 37 is an explanatory diagram showing a data communication sequence in the above embodiment.

FIG. 38 is a flowchart showing an operation of the wireless terminal 110 at the time of connection in data communication in the above embodiment.

FIG. 39 is a flowchart showing an operation of the communication terminal at the time of data transmission in the above-mentioned embodiment.

FIG. 40 is a flowchart showing an operation of the communication terminal at the time of receiving data in the above embodiment.

FIG. 41 is a flowchart showing an operation of the wireless terminal 110 at the time of disconnection in data communication in the above-mentioned embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 ... Network control apparatus 102 ... Public line 103 ... Wireless telephone 104 ... Computer 105 ... Multimedia terminal 106 ... Printer 107 ... Facsimile 108 ... Copy machine 109 ... LAN gateway

Claims (3)

[Claims] 1. In a wireless communication system for performing communication between two wireless terminals using a wireless frame, a place for storing voice and data in the wireless frame is set as one voice / data area, and communication is started. When the wireless terminal to store only voice or data in the wireless frame, the above area is set as the area of only voice or data, and when storing the voice and data in the wireless frame, the above area is set at a specific location. A wireless communication system, characterized in that a delimiter, a voice area and a data area are provided, and the type of information stored in the voice / data area is added. 2. The wireless terminal which receives the wireless frame according to claim 1, recognizes a type of information stored in the wireless frame, and when the wireless terminal recognizes that the type of information is only voice, / When the content stored in the data area is received as voice and it is recognized that the type of information is only data, the content stored in the voice / data area is received as data and the type of information is A wireless communication system comprising means for receiving the contents stored in the voice / data area as voice and data when the voice and data are recognized. 3. The system according to claim 1, wherein the wireless communication system has two or more wireless terminals and one or more centralized control stations, and performs communication using a frequency hopping method. Requesting means for requesting the centralized control station to notify the centralized control station of the hopping pattern, and notifying means for notifying the centralized control station in response to the request of the hopping pattern to the wireless terminal making the request. And a notification unit that notifies the destination wireless terminal of the hopping pattern from the wireless terminal that has received the notification of the hopping pattern, and wireless communication is performed between the two wireless terminals by frequency hopping according to the hopping pattern. A wireless communication system characterized by being a thing.