JP3703203B2 - Wireless communication system and wireless communication method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a radio communication system using, for example, a frequency hopping scheme andWireless communication methodIt is about.
[0002]
[Prior art]
A conventional wireless communication system is composed of a centralized control station that manages and controls communication between terminals accommodated in the system and a plurality of terminal stations. Wireless communication was performed between terminal stations based on control data designated by the control station.
[0003]
11 and 12 are explanatory diagrams showing an example of a channel configuration inside a frame used in a conventional wireless communication system.
[0004]
In FIG. 11, CNT indicates a system control channel, LCCH indicates a logical control channel, audio data is exchanged bidirectionally using two audio channels, and END sets a frequency for frequency hopping in the next frame. Indicates the guard time to change.
[0005]
As shown in FIG. 12, in the frame used in the conventional system, the inside of the frame is composed of six channels: CNT, LCCH, two audio channels, data channel, and END.
[0006]
And in the conventional radio | wireless communications system, it communicated between radio | wireless terminals using such a flame | frame.
[0007]
[Problems to be solved by the invention]
However, in the wireless communication system shown in the above-described conventional example, when the wireless frame has independent voice channel and data channel areas and only voice or data communication is performed, the data channel or voice channel that is unnecessary Since frames that store pseudo data are communicated to each other, there is a disadvantage that unnecessary communication is performed.
[0008]
The present invention,soundEliminate waste when communicating either voice or dataTo doFor the purpose.
[0009]
[Means for Solving the Problems]
  In the present invention, an area for storing voice and data in a radio frame to be transmitted is set as one voice / data area, and when only voice or data is communicated, only the voice or data is stored in the area. When communicating data, voice and data are stored in the area, and information indicating the presence / absence of voice and information indicating the presence / absence of data is added to the radio frame, and the radio frame is transmitted. To do.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, in the present embodiment, a digital wireless communication system using a frequency hopping method will be described in detail.
(System configuration)
FIG. 1 is an explanatory diagram illustrating a configuration of a wireless communication system according to the present embodiment.
[0011]
This wireless communication system is composed of a centralized control station that manages and controls communication between terminals accommodated in the system, and a plurality of terminal stations, and is designated by the centralized control station using a radio frame described later. Terminal stations that perform communication perform wireless communication based on the data.
[0012]
The central control station can be any one (or two or more) from the terminal stations in the system.
[0013]
This wireless communication system accommodates a public line 102 and provides control data or voice data between a network control apparatus 101 that provides public network communication services to terminal stations in the system and the central control station or other terminal stations. Control data communication between the wireless telephone 103 that performs voice communication through the public line 102 and performs so-called inter-line communication between a plurality of terminal stations, and a centralized control station or other terminal stations And wireless data terminals 104 to 109 that perform data communication.
[0014]
In the following description, terminal stations such as wireless telephones and wireless data terminals are collectively referred to as wireless terminals 110 (general numbers 104 to 109).
[0015]
In the present embodiment, the wireless data terminal 104 is a terminal device (data terminal) or data input / output device having a function of transmitting data in bursts and a wireless adapter that performs wireless communication, or Refers to a terminal device that integrates them. For example, in addition to the computer 104, multimedia terminal 105, printer 106, facsimile 107, copier 108, LAN gateway 109 shown in the figure, an electronic camera, video camera, scanner, etc. Applicable equipment.
[0016]
A major feature of this system is that these wireless telephone 103 and wireless data terminal 104 can freely communicate with each other and can also access the public network 102.
[0017]
The detailed configuration and operation will be described below.
(1) Wireless telephone
FIG. 2 is a block diagram showing the configuration of the wireless telephone 103. As shown in FIG.
[0018]
The main control unit 201 is responsible for overall control of the radio telephone 103, and the memory 202 is a ROM storing a control program of the main control unit 201, a calling code (system ID) of the radio communication system, It comprises an EEPROM that stores the sub ID, a RAM that provides a work area for control of the main control unit 201, and the like.
[0019]
The communication path unit 203 interfaces the input / output blocks of the handset 208, the microphone 209, and the speaker 210 with the ADPCM codec 204.
[0020]
The ADPCM codec 204 converts an analog voice signal from the speech path unit 203 into an ADPCM code, and converts ADPCM encoded information into an analog voice signal.
[0021]
The frame processing unit 205 performs processing such as scrambling on the ADPCM-encoded information and time-division multiplexes into a predetermined frame. Data assembled into a radio frame (to be described later) by the frame processing unit 205 is transmitted to the main apparatus and the target terminal station via the radio unit.
[0022]
The radio control unit 206 has functions of performing transmission / reception and frequency switching of the radio unit 207, carrier detection, level detection, and bit synchronization.
[0023]
The wireless unit 207 modulates the digital information from the frame processing unit 205 and converts it into a format that can be wirelessly transmitted and sends it to the antenna. At the same time, it demodulates the information received wirelessly from the antenna and converts it into digital information.
[0024]
The handset 208 inputs and outputs voice signals to make a call, and the microphone 209 inputs and collects voice signals. The speaker 210 outputs a voice signal in a loud voice, and the display unit 211 displays a dial number input from the key matrix 212, a public line usage status, 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.
[0025]
Note that the radio control unit 206 and the frame processing unit 205 of the radio telephone 103 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 built in the wireless data terminal devices 104 to 109.
[0026]
In the figure, reference numeral 301 denotes a data terminal typified by a computer, a peripheral device typified by a printer, a facsimile, etc., which are connected to the wireless adapter 302 via a communication cable or an internal bus.
[0027]
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.
[0028]
The main control unit 304 includes a central CPU for control, peripheral devices that perform interrupt control and DMA control, an oscillator for a system clock, and the like, and controls each block in the wireless adapter.
[0029]
The memory 305 includes a ROM for storing a program used by the main control unit 304, a RAM used as a buffer area for various processes, and the like.
[0030]
The communication i / f unit 306 is a communication i / f provided as a standard in the data terminal or peripheral device 301 described above, for example, a communication i / f such as RS232C, Centronics, LAN, a personal computer, an internal bus of a workstation, for example, The wireless adapter 302 performs control for communication using the ISA bus, PCMCIAi / f, and the like.
[0031]
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.
[0032]
The wireless control unit 309 controls transmission / reception switching, frequency switching, and the like of the wireless unit 303, and has functions of performing carrier detection, level detection, and bit synchronization.
[0033]
The error correction processing unit 310 detects or corrects a bit or byte error generated in communication data due to various wireless environments. At the time of transmission, an error correction code is inserted into the communication data to make the data redundant. In addition, at the time of reception, a bit error generated in the received data is corrected by calculating an error position and an error pattern by arithmetic processing.
[0034]
In such a wireless adapter 302, the communication i / f unit 306 can be configured from a PC board described later, and the channel codec unit 308 and the wireless control unit 309 can be configured from a channel codec board described later. it can.
(3) Network control device
FIG. 4 is a block diagram showing an internal configuration of the network control apparatus 101.
[0035]
The main control unit 401 is responsible for overall control of the network control apparatus 101, and the memory 402 is a ROM that stores a program, a call code (system ID) of the wireless communication system, and the like, for control of the main control unit 401. This memory is composed of a RAM or the like that stores various data and provides a work area for various calculations.
[0036]
The line i / f unit 403 is an interface unit that performs power supply for accommodating the public network line 102, selection command transmission, DC loop closure, public network line control such as PCM conversion, selection command reception, and calling command transmission. .
[0037]
The ADPCM codec unit 404 converts the analog voice signal received by the line i / f unit 403 via the public network 102 into an ADPCM code, transfers the ADPCM code to the channel codec unit 405, and performs ADPCM encoding from the channel codec unit 405. The audio signal is converted into an analog audio signal.
[0038]
The channel codec unit 405 performs processing such as scrambling on the ADPCM-encoded information and time-division multiplexes it into a predetermined frame. The channel codec unit 405 is assembled into a radio frame described later. Data is transmitted to the control station and the target wireless terminal 110 via the wireless unit.
[0039]
The wireless control unit 406 controls transmission / reception switching, frequency switching, and the like of the wireless unit 407, and also has a function of performing carrier detection, level detection, and bit synchronization.
[0040]
The radio unit 407 modulates the framed information from the channel codec unit 405, converts it into a format that can be transmitted by radio, sends it to the antenna, demodulates the information received from the antenna, and processes it into digital information It is. The detection unit 408 detects various tones such as incoming call detection, loop detection, PB signal, dial tone, and ringtone.
[0041]
In such a network control apparatus 101, the line i / f unit 403 and the ADPCM codec unit 404 can be configured from a PSTN board described later, and the channel codec unit 405 and the radio control unit 406 are configured from the channel codec board. Can be configured.
(4) Radio unit
FIG. 5 is a block diagram showing a radio unit having a configuration common to the radio terminals 110 of this system.
[0042]
The transmitting / receiving antennas 501a and 501b are for efficiently transmitting and receiving wireless signals, and the changeover switch 502 is for switching between the antennas 501a and 501b. A band pass filter (hereinafter referred to as BPF) 503 is for removing signals in unnecessary bands, and a changeover switch 504 is for switching between transmission and reception.
[0043]
The amplifier 505 is a reception system amplifier, and the amplifier 506 is a transmission system power control amplifier. Converter 507 is a 1st. The IF down converter, and the converter 508 is an up converter.
[0044]
The changeover switch 509 is used to switch between transmission and reception, and the BPF 510 is used to remove a signal in an unnecessary band from the signal converted by the downconverter 507. Converter 511 has 2nd. This is an IF down-converter, and the two down-converters 507 and 511 constitute a double-conversion reception form.
[0045]
BPF512 is 2nd. The 90-degree phase shifter 513 is for IF and shifts the output phase of the BPF 512 by 90 degrees. The quadrature detector 514 detects and demodulates the signal received by the BPF 512 and the 90 degree phase shifter 513. Further, the comparator 515 is for shaping the output of the quadrature detector 514.
[0046]
In addition, a voltage-controlled oscillator (hereinafter referred to as VCO) 516, a low-pass filter (hereinafter referred to as LPF) 517, and a PLL 518 including a programmable counter, a prescaler, a phase comparator, etc. A frequency synthesizer is configured.
[0047]
A carrier signal generating VCO 519, LPF 520, and PLL 521 including a programmable counter, a prescaler, a phase comparator, and the like constitute a frequency synthesizer for hopping.
[0048]
A transmission-system frequency synthesizer having a frequency modulation function is configured by the transmission-system VCO 522 having a modulation function, the LPF 523, and the PLL 524 including a programmable counter, a prescaler, a phase comparator, and the like.
[0049]
The reference clock oscillator 525 supplies a reference clock for various PLLs 518, 521, and 524, and the baseband filter 526 is a band limiting filter for transmission data (baseband signal).
[0050]
(Description of PSTN board configuration and operation)
The PSTN board is a board constituting the network control apparatus 101 together with the CHC board, has an interface for one PSTN line, and controls outgoing / incoming calls to the PSTN line.
[0051]
FIG. 6 is a block diagram showing the configuration of the PSTN board 1101.
[0052]
In the figure, a PSTN line 1102 is one line composed of L1 and L2, and a control unit 1103 controls the PSTN board 1101 and the network control apparatus 101 as a whole, including PSTN line control. The ROM 1104 stores a control program for the control unit 1103, and the RAM 1105 stores various data for control by the control unit 1103 and provides a work area for various calculations. Further, a reset circuit 1106 is connected to the control unit 1103.
[0053]
The control input / output circuit 1107 inputs / outputs control signals for each unit, and the call signal detection circuit 1108 is directly connected to the PSTN line 1102 and detects the call signal (16 Hz / 75 V) (ie, incoming call). To detect). The DC loop forming / DP sending circuit 1109 closes the DC loop of the PSTN line 1102 and sends dial pulses (DP) for DP transmission.
[0054]
The loss insertion circuit 1110 guarantees the line resistance of the PSTN line, and the 2-line / 4-line conversion circuit 1111 is a 4-line i / f in which transmission / reception is separated from the 2-line i / f of the PSTN line integrated with transmission / reception. It is to convert to.
[0055]
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.
[0056]
The hold tone creation circuit 1114 is a circuit for sending a hold tone to the PSTN line, and the DTMF creation circuit 1115 is a circuit for creating a DTMF (PB) signal for PB transmission.
[0057]
The ADPCM codec 1116 A / D converts the received analog signal into an ADPCM signal and D / A converts the received ADPCM signal. The 400 Hz detection circuit 1117 is a circuit for detecting a dial tone and busy sound, and the inter-board i / f circuit 1118 is a circuit that performs i / f with the channel codec board.
[0058]
Hereinafter, a basic PSTN line outgoing / incoming operation of the PSTN board 1101 will be described.
[0059]
1. When calling
When the PSTN line transmission request from the channel codec board is received via the inter-board i / f circuit 1118 based on the transmission request to the PSTN line from the wireless terminal 110, the control unit 1103 of the PSTN board causes the DC loop formation / DP. The transmission circuit 1109 is controlled to form a direct current loop for the PSTN line 1102 and perform a transmission request operation. The directing sound (400 Hz) transmitted from the PSTN line in response to the direct current loop formation, After receiving in the 400 Hz detection circuit 1117 via the DP transmission circuit 1109, the loss insertion circuit 1110, the 2-wire / 4-line conversion circuit 1111 and the reception circuit 1113, and confirming the 400Hz detection notification from the 400Hz detection circuit 1117, the control unit Is 1103 a channel codec board via an inter-board i / f circuit? It sends a dial signal based on the transmitted dialed number.
[0060]
When the line type of the PSTN line is a DP line, the DC loop forming / DP sending circuit 1109 is controlled to turn on / off the DC loop of the PSTN line and send out the dial number as DP (dial pulse). If the PSTN line type is a PB line, the DTMF creation circuit 1115 is controlled to set the dial number via the transmission circuit 1112, the 2-wire / 4-wire conversion circuit 1111, the insertion loss circuit 1110, and the DC loop formation / DP transmission circuit 1109. It is sent as a DTMF (PB) signal. After sending the dial signal, the control unit 1103 includes a DC loop forming / DP sending circuit 1109, a loss insertion circuit 1110, a 2-wire / 4-wire conversion circuit 1111, a receiving circuit 1113, an ADPCM codec 1116, an inter-board i / f circuit 1118, and By forming the speech path of the inter-board i / f circuit 1118, the ADPCM codec 1116, the transmission circuit 1112, the 2-wire / 4-wire conversion circuit 1111, the insertion loss circuit 1110, and the DC loop formation / DP transmission circuit 1109, the channel codec A voice signal can be transmitted and received between the wireless terminal 110 and the PSTN line 1102 that are wirelessly connected via the board.
[0061]
2. Incoming call
When there is an incoming call from the PSTN line 1102, that is, when the call signal detection circuit 1108 detects the call signal indicating the incoming call and notifies the control unit 1103, the control unit 1103 receives the channel codec via the inter-board i / f circuit 1118. The board is controlled to transmit a control command indicating an incoming notification from the PSTN line to the wireless terminal 110. On the other hand, when the channel codec board notifies the control unit 1103 of an incoming response from the wireless terminal 110 via the inter-board i / f circuit 1118, By forming a speech path similar to that at the time of outgoing call, voice signals can be transmitted and received between the PSTN line and the wireless terminal 110.
[0062]
In the control operation described above in more detail, the control unit 1103 controls each unit directly or via the control input / output circuit 1107.
[0063]
As described above, outgoing / incoming control of the PSTN line is performed.
[0064]
(PC board configuration and operation explanation)
FIG. 7 is a block diagram showing the configuration of the PC board 1601.
[0065]
The PC board 1601 controls the CPU 1602 that controls the PC board, the CHC board, and the like, the ROM 1603 that stores the control program of the CPU 1602, the RAM 1604 that is used as a buffer area for various processes, the data terminal, the CHC board, and the like. A communication interface unit 1605 for exchanging data and transmission / reception data.
[0066]
Hereinafter, the operation of the PC board will be described.
[0067]
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 operates according to the control data.
[0068]
When the communication interface unit 1605 of the PC board 1601 receives transmission / reception data, the data is transferred to the RAM 1604, and the data stored in the RAM 1604 is transmitted to the CHC board, data terminal, etc. via the communication interface unit 1605. .
[0069]
FIG. 8 is a block diagram showing the configuration of the communication interface unit. The details will be described below with reference to FIG.
[0070]
The communication interface unit 1701 includes an address decoding unit 1702, a card attribute information unit 1703, a card configuration register unit 1704, and a card interface register unit 1705.
[0071]
The address decoding unit 1702 performs address decoding from the CPU of the computer and address decoding 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 depending on the contents of the address.
[0072]
Next, the card attribute information section 1703 stores information for initial setting of the PC card, which is read by the computer at the time of initial setting of the PC card and sets the PCMCIA controller in the computer. The card configuration register unit 1704 is set. The card configuration register unit 1704 is a register for storing information related to the card configuration, reset, and card status, and the PC board and the computer can know the status of the card by reading this register. .
[0073]
The card interface register unit 1705 is a part that serves as an interface for transmitting and receiving commands and data between the computer and the PC board.
[0074]
(Radio frame operation)
FIG. 9 is an explanatory diagram illustrating a channel configuration inside a frame used in the present embodiment, and FIG. 10 is an explanatory diagram illustrating an internal configuration example of each channel.
[0075]
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, as shown in FIG. 10, the frame used in this embodiment is composed of four channels: CNT, LCCH, voice / data channel, and END.
[0076]
In FIG. 10, CS is a carrier sense time for 12.8 usec, PR is a 56-bit preamble for bit synchronization acquisition, SYN is a 31-bit frame synchronization signal defined by 1 dummy bit + RCR, and ID is defined by RCR 63 Bit call signal + 1 dummy bit, UW is a 24-bit unique word (for capturing byte synchronization), BF is 8-bit basic frame number information (cycles 1 to 20), WA is activated among sleep mode terminals A field for entering a system address of a terminal station to be performed, NF is frequency information used in the next frame, Rev is an area number for distinguishing from neighboring cells, GT is a guard time, CS0, CS1, and CS2 are carrier sense times, DA is a field for entering a system address, D of the line control channel ta is control command information, Data of data channel is data information for data transfer, CRC of system control channel is CRC information for BF to Rev, CRC of circuit control channel is CRC information for CS0 to Data, CRC of voice channel is T CRC information for / R, CF is a guard time for frequency switching, and T / R is B channel information of 32 kbps.
[0077]
The VT stores information indicating whether voice is stored in the voice / data channel. If this stored value is 1111, audio is included in the audio / data channel, and if it is 0000, audio is not included in the audio / data channel. The DT stores information indicating whether data is included in the voice / data channel. If this stored value is 1111, data is included in the voice / data channel, and if it is 0000, data is not included in the voice / data channel. That is, when VT = 1111 and DT = 0000, the voice / data channel is configured only by the voice channel, and when VT = 0000 and DT = 1111, the voice / data channel is configured only by the data channel, and VT = In the case of 1111 and DT = 1111, the voice / data channel is composed of a voice channel and a data channel.
[0078]
In this embodiment, unlike the conventional frame format shown in FIG. 11, the voice channel and the data channel are not determined as channels, and the voice channel and data channel are set as one channel (voice / data channel in FIG. 10). In addition, when the voice and data stored in the voice / data channel are selectively used by the above-described DT and VT and voice or data only communication is performed, the voice / data channel is used for the voice channel in the case of voice communication. In the case of data communication, the voice / data channel is used for the data channel, so that unnecessary communication is not performed, the communication efficiency of the wireless communication system is improved, and only one voice and data communication is performed. The power consumption of the wireless terminal is reduced. In addition, the number in the figure represents the number of bits and shows an example of the length of each part.
[0079]
The central control station transmits the CNT channel at the start of each frame, and stations other than the central control station always receive the CNT channel in order to establish bit synchronization and frame synchronization. The LCCH channel is used when exchanging a hopping pattern assignment request with the central control station prior to line connection, line disconnection or line connection, or when exchanging hopping pattern assignment with the central control station when the line is disconnected. For connection or disconnection of the line, the system address of the other party who wishes to communicate is entered in the DA field provided in the LCCH channel, and is directly exchanged with the other party.
[0080]
A voice call is realized by using one of the two voice channels for transmission and the other for reception. Which of the two is used for transmission is determined by making a meeting with the other party on the LCCH channel exchanged when the line is connected. The data channel determines how to perform data transmission by making a meeting with the other party on the LCCH channel exchanged at the time of line connection.
[0081]
(Frequency hopping)
FIG. 14 is an explanatory diagram showing an example of frequency hopping. In this figure, a system having 8 base frames (hereinafter referred to as BF) and using 8 frequencies from F1 to F8 is taken as an example. In each base frame, which frequency is used by the first HP, the second HP, and the third HP is 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 a different frequency. In addition, one frame shown in FIG. 9 exists in one base frame, and each HP changes the frequency in a predetermined order every frame, that is, every time the base frame is completed.
[0082]
How the system performs frequency hopping will be described with reference to the drawings.
[0083]
The hopping pattern in which the central control station transmits the system control channel is assumed to be the first HP in FIG. That is, the frequency is changed for each BF, such as F1 for BF1, F2 for BF2, F3 for BF3, and so on.
[0084]
Although the frequency hopping has been described with reference to FIG. 14, the frequency hopping in the frame of the present embodiment will be described below.
[0085]
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.
[0086]
As shown in FIG. 15, all the radio terminals 110 other than the central control station first set the frequency set in the radio unit to the first HP in order to receive the system control channel transmitted by the central control station in BF1. Set to the frequency F1 used by BF1. All wireless terminals 110 other than the centralized control station establish frame synchronization using the received system control channel.
[0087]
The logical control channel for exchanging communication connection requests and disconnection requests is exchanged at the same frequency as the system control channel. A terminal having control data such as communication line connection and communication line disconnection to be transmitted through the logical control channel transmits control data directly to the other party through the logical control channel when the logical control channel is used.
[0088]
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 data, and 4 bits of 1111 are stored in VT and DT. The wireless terminal having the same address as the DA of this logical control channel receives this logical control channel, and when the VT and DT recognize that VT = 1111 and DT = 1111, voice and data are transmitted from the transmitting wireless terminal. In the voice / data channel, the frequency is changed to a frequency corresponding to the HP assigned in advance from the central control station for voice and data.
[0089]
Of course, the transmitting wireless terminal that transmits voice and data performs frequency hopping in the same manner as the wireless terminal that has received the logical control channel. At this time, depending on the assignment status from the central control station, the same HP may be assigned to the system control channel and the logical control channel. 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. An example is given. In this example, therefore, the frequency is changed three times during one frame.
[0090]
Next, FIG. 13 shows an example of details of the voice communication between the terminals AB described in FIG. A mode that the terminal A and the terminal B are communicating by 1st HP shown in FIG. When the logical control channel ends, the terminal in voice communication sets the frequency to be changed from the current base frame number 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 through the first voice channel is exchanged with the communication partner in advance, and transmission / reception of the wireless unit is controlled based on the communication control information.
[0091]
The case of BF1 will be described. When the logical control channel ends, terminal A changes the frequency according to the frequency hopping pattern assigned to voice communication. As a result of changing the frequency, since the first HP is assigned to the terminal A and the terminal B, the frequency does not change. Terminal A sets the radio unit to transmit, terminal B sets the radio unit to receive, and exchanges audio data on the first audio channel. At the end of the audio channel, terminal A sets the radio unit to receive, terminal B sets the radio unit to transmit, and exchanges audio data on the second audio channel. At the end of the second voice channel, in preparation for the next data communication, each terminal sets the frequency obtained from the frequency hopping pattern assigned to the data communication to the radio unit and the current base frame from the number in the radio unit.
[0092]
After the end of the data channel, during END, in order to receive the system control channel at the next BF2, the frequency is set to F2 which is the frequency used by BF2 at the first HP. The frequency hopping procedure after the base frame becomes BF2 repeats the above procedure.
[0093]
Next, a hopping pattern in voice communication will be described with reference to FIG. That is, a case where only audio is stored in the audio / data channel will be described.
[0094]
As shown in FIG. 17, all wireless terminals 110 other than the centralized control station first set the frequency set in the wireless unit to the first HP in order to receive the system control channel transmitted by the centralized control station in BF1. Set to the frequency F1 used by BF1. All wireless terminals 110 other than the centralized control station establish frame synchronization using the received system control channel.
[0095]
The logical control channel for exchanging communication connection requests and disconnection requests is exchanged at the same frequency as the system control channel. A terminal having control data such as communication line connection and communication line disconnection to be transmitted through the logical control channel transmits control data directly to the other party through the logical control channel when the logical control channel is used. 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.
[0096]
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, voice is transmitted from the transmitting wireless terminal. In the voice / data channel, the frequency is changed to the frequency corresponding to the HP assigned in advance from the central control station for voice.
[0097]
Of course, the transmitting wireless terminal that transmits voice performs frequency hopping similarly to the wireless terminal that has received the logical control channel. At this time, depending on the assignment status from the central control station, the same HP may be assigned to the system control channel and the logical control channel. The example illustrated in FIG. 17 illustrates an example in which the second HP is assigned to the voice communication between the terminals AB with respect to the first HP of the system control channel and the logical control channel. In this example, therefore, the frequency is changed twice in one frame.
[0098]
The details of the voice communication are the same as described above.
[0099]
Next, a hopping pattern in data communication will be described with reference to FIG. That is, a case where only data is stored in the voice / data channel will be described.
[0100]
As shown in FIG. 18, the previous wireless terminal 110 other than the centralized control station first sets the frequency set in the wireless unit to the first HP in order to receive the system control channel transmitted by the centralized control station in BF1. Set to the frequency F1 used by BF1. The previous wireless terminal 110 other than the centralized control station establishes frame synchronization using the received system control channel.
[0101]
The logical control channel for exchanging communication connection requests and disconnection requests is exchanged at the same frequency as the system control channel. A terminal having control data such as communication line connection and communication line disconnection to be transmitted through the logical control channel transmits control data directly to the other party through the logical control channel when the logical control channel is used. 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 0000 are stored in VT and 1111 are stored in DT. The wireless terminal having the same address as the DA of this logical control channel receives this logical control channel, and when the VT and DT recognize that VT = 0000 and DT = 1111, data is transmitted from the transmitting wireless terminal. In the voice / data channel, the frequency is changed to a frequency corresponding to the HP assigned in advance from the central control station for data.
[0102]
Of course, the transmitting wireless terminal that transmits data performs frequency hopping similarly to the wireless terminal that has received the logical control channel. At this time, depending on the assignment status from the central control station, the same HP may be assigned to the system control channel and the logical control channel. The example illustrated in FIG. 18 illustrates an example in which 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 this example, therefore, the frequency is changed twice in one frame.
[0103]
(Configuration and operation of CHC board)
The channel codec board is roughly divided into a channel codec for assembling data into a predetermined frame format and disassembling the frame, a radio unit for modulating / demodulating, and an ADPCM codec for digitally encoding / decoding audio.
[0104]
FIG. 16 is a block diagram showing the internal configuration of the channel codec board. In the figure, a channel codec 3101 is provided between an ADPCM codec 3103 connected to an audio input / output unit (headset) 3102 and a radio unit 3129.
[0105]
The channel codec 3101 includes a CPU bus interface 3105 to which the CPU bus 3104 is connected, an ADPCM interface 3106 connected to the ADPCM codec 3103, a mode register 3107 for setting an operation mode, a hopping pattern register 3108, and a frame number. / Next frequency number (BF / NF) register 3109, system ID register 3110, intermittent activation terminal address register 3111, LCCH register 3112, and FIFO buffer 3113.
[0106]
The timing generation unit 3114, the CNT channel assembly / disassembly unit 3115, the LCCH (logic control channel) assembly / disassembly unit 3116, the data assembly / disassembly unit 3117, the voice assembly / disassembly unit 3118, and the frame synchronization unit 3119 The unique word detection unit 3120, the CRC encoding / decoding unit 3121, the bit synchronization unit 3122, the radio control unit 3123, the intermittent reception control unit 3124, the scramble / descramble 3125, and the radio unit 3129. An AD converter 3126 that converts an analog reception signal into a digital signal, and a reception level detection unit 3127 that detects a reception level based on an input from the AD converter 3126 and outputs an interrupt signal 3128.
[0107]
The operation of the channel codec board will be described below with reference to FIG.
[0108]
The reference for the operation timing of the channel codec board is generated by the timing generator 3114 of the central control station side channel codec 3101. The central control station transmits frames according to this timing, and the terminal station that receives the frames maintains frame synchronization according to the frame synchronization word.
[0109]
Data sent from the central control station side through the CNT channel is stored in a register inside the channel codec 3101. The channel codec 3101 includes an HP (hopping pattern) register 3108, an ID register 3110, and a WA (start-up terminal address) register 3111. In the central control station, the CPU writes necessary values in these registers. Further, the value in the frame number / next frame frequency number (BF / NF) register 3109 is updated in synchronization with the operation timing. The frequency number written to the NF register is the CNT channel hopping pattern (first hopping pattern). The channel codec 3101 reads the data in these registers at the timing of transmitting the CNT channel data, assembles the data by the CNT assembling unit 3114, and sends the data to the radio unit 3129.
[0110]
On the other hand, in the terminal station, when data is received from the wireless unit 3129 through the CNT channel, the CNT decomposition unit 3114 performs decomposition and performs processing using the received values of each unit. Only when the received system ID matches the value written in the ID register 3108 of the own station, the subsequent data is controlled to be received. If the received WA matches the value of the WA register 3109 of the own station during intermittent reception, an activation request interrupt is generated. Further, the table of the hopping pattern register 3110 is rewritten using the received BF and NF information data.
[0111]
Since the frequency number applied to the NF field is that of the CNT channel hopping pattern, the hopping pattern used for the voice channel and data channel is a hopping pattern register created based on the frequency number written to the NF field. It is the structure which produces | generates by carrying out time shift.
[0112]
In the LCCH channel, data stored in the LCCH register 3116 in the channel codec 3101 by the CPU of the transmitter terminal 110 is assembled by the LCCH assembling / disassembling unit 3116 and transmitted to the radio unit at a predetermined timing. The received LCCH data is decomposed by the LCCH assembling / disassembling unit 3116, temporarily stored in the LCCH register 3116 inside the channel codec, then interrupted to the CPU, and read by the CPU.
[0113]
In the audio channel, the audio input from the audio input / output unit 3102 is digitally encoded by the ADPCM codec 3103 and then 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 sent to the radio unit 3129 at a predetermined timing.
[0114]
Conversely, the audio data received from the radio unit is decomposed by the audio assembling / decomposing unit 3118, output at the timing of the ADPCM codec 3103 via the ADPCM interface 3116, and output to the audio input / output unit 3102.
[0115]
In the data channel, data is transmitted only when the CPU makes a data transmission request. When a data transmission request is made, the CPU bus interface 3105 of the channel codec outputs a DMA request at the timing of each 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 sends it to the wireless unit at a predetermined timing.
[0116]
Conversely, when data is received, the data assembling / decomposing unit 3117 converts the data into parallel and outputs a DMA request for each byte, and the DMA controller transfers the received data to the memory. When data transfer for one frame is completed, an interrupt is generated for the CPU.
[0117]
At the time of data transmission, a CRC code is generated by a CRC code generation unit 3120 as necessary, and is stored in a CRC field for transmission. On the receiving side, the CRC can be checked to detect the occurrence of an error. All transmission data other than the frame synchronization word and unique word are scrambled by the scrambler 3124. This is to reduce the unbalance of the data sent to the radio unit and facilitate the extraction of the synchronous clock.
[0118]
On the contrary, when data is received, when a unique word is detected, descrambling is performed in the descrambler 3124 at that timing, and a CRC check is performed, and at the same time, data is input to the decomposition unit of each field.
[0119]
As described above, wireless transmission of voice and data according to a predetermined frame is performed.
[0120]
(Operation of centralized control station)
In order for this wireless communication system to operate, the central control station manages the hopping frequency in the system, and the terminal station is assigned a communication channel determined by a hopping pattern (HP) and a time slot from the central control station. It is assumed that.
[0121]
In addition to managing each communication channel, the centralized control station has functions such as system HP change, terminal station intermittent reception status management, and terminal station system registration. The operation of the centralized control station when there is a need for communication channel management and HP change, which is the basis of the above, will be described. Management of the communication channel in the central control station is to allocate an unused HP to the communication data type (voice or data) requested from the terminal station and release it.
[0122]
First, communication channel management will be described.
[0123]
FIG. 19 is an explanatory diagram showing an HP allocation sequence. This figure shows a sequence from when the terminal station requests HP to the central control station in order to communicate with a specific communication partner station, until communication is terminated and HP is released.
[0124]
The terminal station sends an HP allocation request 4101 to the central control station in order to start communication with a specific communication partner station. The HP allocation request 4101 includes parameters such as the ID of the communication partner station and the data type. If there is an unused HP with the requested data type, the centralized control station sends an HP assignment 4102 to the terminal station.
[0125]
The terminal station sends the assigned HP to the communication partner station and makes a connection request. If the connection permission is obtained from the communication partner station, the terminal station sends a connection completion notice 4103 to the central control station.
[0126]
The centralized control station confirms and manages the usage status of the HP allocated by the parameter of the terminal station connection completion notice 4103 and sends a connection completion confirmation 4104 to the terminal station. After receiving the connection completion confirmation 4104, the terminal station subsequently communicates with the communication partner station using the assigned HP.
[0127]
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 central control station. The central control station changes the usage status of the allocated HP and sends an HP release confirmation 4106 to the terminal station. The terminal station receives the HP release confirmation 4106 and ends communication.
[0128]
FIG. 20 is a flowchart showing HP allocation in the central control station. This figure describes the processing performed on the central control station side from the time when the terminal station requests HP to the start of communication.
[0129]
When receiving the HP allocation request from the terminal station (S4201), the central control station checks whether there is an unused HP of the requested data type (S4202) by referring to the HP table. If there is no unused HP, the terminal station is notified that there is no unused HP (S4204). If there is an unused HP, temporary registration (S4203) is performed in the HP table, and HP temporary allocation (S4205) is performed to the terminal station.
[0130]
The central control station confirms whether or not the terminal station has successfully connected to the communication partner station (S4207) with the HP that has been temporarily allocated by the connection completion notification (S4206) from the terminal station, and the connection has been successful. If not, the temporarily allocated HP is registered unused in the HP table (S4209). If the connection is successful, the temporarily allocated HP is registered for use in the HP table (S4208). The centralized control station sends a connection completion confirmation to the terminal station after registering the usage status in the HP table (S4210), and finishes the requested HP allocation.
[0131]
FIG. 21 is a flowchart showing HP release in the central control station. This figure describes the processing performed on the central control station side in the procedure for releasing the allocated HP after communication is completed at the terminal station.
[0132]
When the central control station receives the HP release request from the terminal station (S4301), it checks the terminal ID and the release request HP included in the parameters (S4302). If the release request HP is not a normally assigned HP, an error notification (S4304) notifies the terminal station and does not release the HP. If the release request HP can be confirmed normally, unused registration is performed in the HP table (S4303), and an HP release confirmation (S4305) is sent to the terminal station.
[0133]
In this way, in this system, the central control station has an HP table unique to the system, and communication channel assignment of communication performed between each terminal station is realized by the central control station allocating HP. The station manages all communications in the system.
[0134]
Next, the operation of the central control station when changing the HP will be described.
[0135]
This is a function of replacing a frequency that cannot be used with an unused frequency and changing the HP to avoid the failure when a frequency with HP communication becomes unusable due to a failure such as narrow-band interference. . There are two ways of changing the HP, when a change request is received from the terminal station and when the central control station directly performs the change. In response to these requests, the central control station changes the hopping frequency table, and notifies each terminal station of a system HP change notification using NF (Next Frequency) in the system control channel transmitted every frame. Do.
[0136]
FIG. 22 is a flowchart showing HP change in the central control station.
[0137]
When receiving the HP change request from the terminal station, the centralized control station confirms the necessity of the HP change (S4401). And when necessity is not recognized, HP is not changed. If the necessity is recognized, the presence / absence of an 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, and the NF in the system control channel is changed and notified to each terminal station.
[0138]
When changing the HP directly at the centralized control station, the presence / absence of an 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, and the NF in the system control channel is changed and notified to each terminal station.
[0139]
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 central control station itself.
[0140]
Hereinafter, the specific operation of this system will be described in several cases.
[0141]
1. Processing at power-on
(1) Sequence of control station and terminal station when power is turned on
FIG. 23 is a sequence showing operations of the control station and the terminal station when the power is turned on in this system.
[0142]
When the power is turned on in S5101 and the terminal is initialized, the terminal determines whether the terminal is a central control station or a terminal station, and recognizes that the terminal is a central control station. And assembles a synchronization signal, hopping pattern information, own area number, etc. into a frame, and outputs it as a CNT frame at a predetermined timing.
[0143]
Similarly, after the terminal is started up, when it is recognized that the terminal is a terminal station, the address of the terminal and the area number of the control station to be received are stored. When this process ends, the control station waits for a CNT frame at an arbitrary frequency. When a CNT frame is received from the central control station, a frequency to hop in 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 in the central control station, and stores it.
[0144]
When the hopping pattern is stored in the terminal station, the terminal station notifies the terminal station that it is newly added as a terminal station using the LCCH frame in S5102. At this time, the global address received by all terminals is entered in DA of the LCCH frame, and data indicating that new registration is to be performed is transmitted in the data portion.
[0145]
The central control station receives the LCCH frame, receives data in the data section when the DA in the LCCH has a global address, and if there is an address of the terminal station and a registration request signal, the terminal station based on this information Memorize the address and register a new one.
[0146]
When this registration is completed, in S5103, the central control station notifies the newly registered terminal station of the address of the central control station using the LCCH frame. When the terminal station receives the address of the control station via the LCCH frame, the terminal station stores the address of the control station. After this process is completed, the terminal station notifies the central control station of the completion of startup using the LCCH frame. When the central control station receives the start-up completion notification from the terminal station, the process proceeds to normal processing.
[0147]
The terminal station can make a call from the terminal station in S5105 after outputting the start-up completion notification.
[0148]
(2) Operation at power-on at the central control station
FIG. 24 is a flowchart showing an operation at power-on in the central control station.
[0149]
When the power of the terminal is turned on in S5201, the terminal is initialized in S5202 and enters an operating state. As a result of this processing, when it is recognized in S5203 that the terminal is a centralized control station, processing for storing the address information and area information of the own terminal is performed in S5204. As a means for inputting area information and terminal address information, a value set by a DIP switch or the like at the time of start-up is stored, a value input by a dial key such as a telephone is stored, a computer It is conceivable to receive and store values input via a keyboard via a bus.
[0150]
When this address information is received, it is determined whether or not the value input in S5205 is valid. If it is not valid, the address information is stored again in S5204.
[0151]
If it is confirmed that the address stored in S5205 is valid, processing for determining a hopping pattern to be used in S5206 is performed. At this time, the centralized control station senses all available frequencies and selects a predetermined number of frequencies having the best radio wave state as the hopping pattern.
[0152]
As a result of acquiring the hopping pattern in S5207, if the usable frequency is equal to or less than the predetermined number, it is detected in S5211 whether carrier sense has been performed for a predetermined time. If it has not been performed for a predetermined time, the process for determining the hopping pattern is continued in S5206. When it is detected in S5211 that a predetermined time has elapsed, in S5212, the central control station notifies that the hopping pattern cannot be determined by screen display or sound.
[0153]
After this processing, if there is a request for determining the hopping pattern again in S5213, processing for determining the hopping pattern is performed in S5206. If there is no retry request in S5213, it is notified in S5212 that the hopping pattern cannot be determined.
[0154]
If a predetermined hopping pattern can be obtained in S5207, processing for assembling a CNT frame is performed in S5208. The CNT frame is a frame including a synchronization signal ID, an area number, and frequency information.
[0155]
When the assembly of the CNT frame is completed, the CNT frame is transmitted using one of the hopping patterns determined in S5210, and the CNT frame is transmitted while changing the frequency based on the HP determined in S5211. Shift to normal processing.
[0156]
(2) Operation when registering a new terminal in the central control station
FIG. 25 is a flowchart showing an operation at the time of new registration of a terminal station in the central control station.
[0157]
During the normal processing in S5301, the central control station receives the LCCH frame in S5302, and when the address addressed to itself or all terminals is entered in DA, the control data in the received LCCH frame is extracted and an instruction is executed. .
[0158]
If it is confirmed that the control data received in S5303 is a registration request from the terminal station, the terminal station address transmitted together with the registration request is confirmed in S5304. As a result of the terminal station address confirmation, if it is detected in S5305 that the terminal station address is normal, a process for registering the terminal station address is performed in the central control station in S5306, and the address information is stored.
[0159]
If it is detected in S5305 that the terminal station address is not normal, processing for discarding the registration request received in the LCCH frame is performed in S5310, and normal processing is performed again in S5301.
[0160]
When the registration of the terminal station is completed in S5306, the address of the central control station is entered in the DATA section using the LCCH frame in S5307, and the address of the terminal station is entered in DA and transmitted to the terminal station for which registration has been completed.
[0161]
After the central control station address is transmitted in S5307, if the startup completion notification signal using the LCCH frame from the terminal station that has been registered in S5308 cannot be confirmed, it is detected in S5311 whether a predetermined time has elapsed. If the predetermined time has not elapsed, in S5308, a startup completion notification using the LCCH frame from the terminal station is awaited.
[0162]
If a predetermined time has elapsed after the central control station address is notified to the terminal station in S5311, a process for notifying the central control station address using the LCCH frame is again performed to the terminal station in S5307. If a startup completion notification signal from the terminal station is detected in S5308, a new registration completion process for the terminal station is performed in S5309, and the process proceeds to normal processing.
[0163]
(3) Power-on operation at the terminal station
FIG. 26 is a flowchart showing an operation at power-on in the terminal station.
[0164]
When the power of the terminal is turned on in S5401, the terminal is initialized in S5402 and enters an operation state. As a result of this processing, when it is recognized in S5403 that the terminal is a terminal station, processing for storing the address information and area information of the own terminal is performed in S5404. The terminal station, the central control station determination means, the area information and the terminal address information can be input by storing values set by a DIP switch or the like at the time of start-up, or by using a dial key such as a telephone. It is conceivable to store an input value or to receive and store a value input with a keyboard such as a computer via a bus.
[0165]
When the address information is read, it is determined whether the value input in S5405 is valid. If the value is not valid, the address information is stored again in S5404.
[0166]
If it is confirmed that the address stored in S5405 is valid, processing for acquiring a hopping pattern to be used in S5406 is performed.
[0167]
In S5406, in order to receive the CNT frame from the centralized control station, 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 portion in the CNT frame and compared with the area number stored in the terminal itself.
[0168]
If the area numbers match, the frequency hopped in the next unit time is acquired from the NFR part in the CNT frame, and the terminal station moves the reception frequency to that frequency and waits for the next CNT frame. The terminal station repeats this operation to recognize the central control station to which the terminal station belongs, and also recognizes and stores the frequency hopping pattern.
[0169]
As a result of the hopping pattern acquisition process in S5406, if the hopping pattern cannot be acquired in S5407, a notification that the hopping pattern could not be acquired is sent to the user in S5413 using a warning sound or a screen display. In step S5406, a process for acquiring a hopping pattern is performed.
[0170]
If it is detected in S5407 that the hopping pattern has been acquired, a process for notifying the central control station of the address of the terminal station using the LCCH frame is performed in S5408. Here, using the LCCH frame, the global address received by all the terminals is written in DA in this frame, and the registration request and the own terminal address are added to the DATA part and transmitted to the control terminal.
[0171]
After this signal transmission, the terminal station receives the LCCH frame while changing the frequency according to the hopping pattern acquired in S5409. If the same address as that of the own terminal cannot be confirmed in the DA in the LCCH frame received in S5410, it is monitored in S5414 whether a predetermined time has elapsed after the transmission of the own terminal address.
[0172]
Here, when 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. If it is detected in S5414 that a predetermined time has elapsed, processing for notifying the control terminal of the own terminal address is performed again using the LCCH frame in S5408.
[0173]
When the own terminal address is detected in DA in the LCCH frame from the central control station in S5410 and the data indicating registration is confirmed in the DATA part, the address of the central control station is stored in the DA of the LCCH frame to the control terminal in S5411. The LCCH frame is transmitted with a signal indicating the start-up completion in the DATA section. When the output of this signal is completed, the process proceeds to intermittent reception processing in S5412.
[0174]
2. Processing for outgoing calls from wireless terminals
FIG. 27 is an explanatory diagram showing an outside line transmission sequence according to the present embodiment. FIG. 28 is a flowchart showing the operation of the wireless terminal 110 at the time of outside line transmission in the present embodiment, and FIG. 29 is a flowchart showing the operation of the network control apparatus 101 at the time of outside line transmission in this embodiment.
[0175]
When the wireless terminal 110 performs a transmission operation by pressing the arranged outgoing key or by combining off-hook and dialing (YES in S5801), the wireless terminal 110 acquires HP (hopping pattern) necessary for wireless communication. An HP acquisition request (5601) is transmitted to the central control station (S5802). A wireless communication type (voice / data) is added to this HP acquisition request as a parameter.
In this operation, audio is assumed to be a parameter.
[0176]
Upon receiving the HP acquisition request, the central control station selects a different HP depending on the type, and notifies the wireless terminal 110 by HP notification (5602). Upon receiving the HP notification (S5803), the wireless terminal 110 stores the HP and transmits a connection request (5603) to the network control apparatus 101 using the HP (S5804).
[0177]
When receiving a connection request (YES in S5701), the network control apparatus 101 checks the state of the wireless line, and if it is in a connectable state, transmits a connection confirmation (5604) (S5702). When the connection confirmation is received (S5805), 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 transmission (5606) to the network control apparatus 101 (S5806). The voice call path is connected and the call is in progress (S5807). In this outside line transmission, the other party's dial is put as a parameter, and is transmitted on the LCCH of the radio frame shown in FIG. 11 on the radio link between the radio terminal 110 and the network control apparatus 101.
[0178]
The network control apparatus 101 that has received the outside line transmission (5606) determines whether or not the outside line transmission is possible. If the public network line is available and transmission is possible, the public network 102 is captured (S5704). When the dial tone (5607) from the public network 102 is detected after the capture, the dial (5608, 5609) coming from the wireless terminal 110 is started to be transmitted to the public network 102 by outside line transmission (S5705).
[0179]
When all the digits are transmitted and dial transmission is completed (S5706), the communication path with the public network 102 is connected and the call is in progress (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 so that the wireless terminal 110 can listen to it. When the other party answers, the ringback tone stops and the call is in progress (5611).
[0180]
When the call is finished and the wireless terminal 110 performs a disconnection operation (for example, on-hook) (S5808), an on-hook (5612) is transmitted (S5809). This on-hook is received by the network control apparatus 101 (S5709), the network control apparatus 101 disconnects the public network 102 (S5711), and transmits a disconnection confirmation (5613) to the wireless terminal 110 (S5711).
[0181]
Receiving the disconnection confirmation, the wireless terminal 110 releases the speech 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 HP release (5615). When receiving the HP release (S5812), the wireless terminal 110 ends the process.
[0182]
The above is the operation of the network control device 101 and the wireless terminal 110 at the time of outgoing line transmission. For example, dials are not transmitted all at once by external line transmission, but are divided and transmitted to the network control device 101 after outgoing line transmission. It may be transmitted. Further, when the wireless terminal 110 continuously transmits an outside line, the same HP may be used continuously without transmitting the last HP release request.
[0183]
3. Processing when an external line arrives at a wireless terminal
[Operation of network controller]
FIG. 30 is an explanatory diagram showing an outside line incoming call sequence in the present embodiment, and FIG. 31 is a flowchart showing an operation of the network control apparatus 101 at the time of an outside line incoming call in the present embodiment.
[0184]
First, when there is an incoming call (6101) from the public network 102 in S6201, the process proceeds to S6202, and the network control apparatus 101 requests the centralized control station for an HP to be used for a call (6102). Upon receiving the HP request, the centralized control station selects an HP that is not currently used from the HP table managed by the central control station, and notifies the network control apparatus 101 of the HP (6103). In step S6203, HP information is received.
[0185]
In step S6204, the network control apparatus 101 transmits an external line incoming signal 6104 to the wireless terminals 110A and 110B.
[0186]
When the wireless terminal 110 (A) goes off-hook and the network control apparatus 101 receives an off-hook signal (6105) in S6205, the process proceeds to S6202, and the wireless terminal 110 (A) that has transmitted the off-hook signal is used for an outside call. A connection request signal 6106 carrying information such as HP to be used is transmitted.
[0187]
When the connection confirmation signal 6107 is received in step S6207, the process advances to step S6208 to notify the central control station that the connection with the wireless terminal 110 is completed (6108). In step S6209, the wireless terminal 110 (A) is notified. While transmitting the call display signal 6109, the process proceeds to S 6210, and an outside line incoming call stop signal 6110 is transmitted to the other wireless terminal 110 (in this case, the wireless terminal 110 (B)). In step S6211, the wireless terminal 110 (A) is connected to the public network 102 to start a call.
[0188]
Further, the network control apparatus 101 continues the connection with the public network 102 until the on-hook signal 6111 is received from the radio 110 (A) in S6212. If the on-hook signal 6111 is received, the process advances to step S6213 to transmit a line disconnection signal 6112 to stop the connection between the public network 102 and the wireless terminal 110 (A). Further, in S6214, an external line busy display stop signal 6113 is transmitted to the other wireless terminal 110 (B).
[0189]
Finally, the network control apparatus 101 transmits a signal (6114) requesting release of the HP used in the call to the central control station in S 6215, and the central control station updates the HP management table and updates the HP management table. The network control apparatus 101 is notified of the release (S6216, 6115).
[0190]
[Operation of wireless terminal]
FIG. 32 is a flowchart showing the operation of the wireless terminal 110 when an outside line is received in this embodiment.
[0191]
First, upon receiving an outside line incoming signal 6104 from the network control apparatus 101 in S6301, the wireless terminal 110 sounds a ringtone or the like, and detects whether or not it is off-hooked in S6302. If the wireless terminal 110 (A) is off-hooked here, the process advances to step S6303 to transmit an off-hook signal 6105 to the network control apparatus 101. If a connection request signal 6106 including information such as HP is received from the network control apparatus 101 in S6304, a connection confirmation signal 6107 is returned in S6305.
[0192]
When a call display signal 6109 is received from the network control apparatus 101 in S6306, the wireless terminal 110 (A) displays a call in progress on the display unit, and starts a call in S6307. Furthermore, the telephone call is continued until the on-hook is made in S6308. When the on-hook is made, the process proceeds to S6309, and an on-hook signal 6111 is transmitted to the network control apparatus 101. Then, when the line disconnect signal 6112 is received in S6310, the line is disconnected, the call display on the display unit is turned off, and the call ends.
[0193]
In S6311, when the wireless terminal 110 (A) starts a call before the wireless terminal 110 is off-hooked, and an external line incoming call stop signal 6110 is received from the wireless terminal 110 (B), The wireless terminal 110 (B) proceeds to S6312 and displays an external line in-use display on the display unit of the wireless terminal 110.
[0194]
Further, the wireless terminal 110 (B) continues the external line busy display on the display unit until the external line busy display stop signal 6113 is received in S6313. When the signal is received, the wireless terminal 110 (B) turns off the external line busy display in S6314.
[0195]
4). Inter-extension call processing
Next, assuming the case where a call between two extensions (voice communication) is performed between two terminal stations, the operation of each of the calling-side radio telephone and the called-side radio telephone will be described (two radio telephones). In the case of an extension call at 103, the calling side is 103-A and the called side is 103-B).
[0196]
FIG. 33 is an explanatory diagram showing a control data sequence of the central control station, terminal station A (calling side), and terminal station B (calling side), and FIG. 34 shows an overview of the processing of the central control station. It is a flowchart. FIG. 35 is a flowchart showing an outline of processing of the calling terminal station, and FIG. 36 is a flowchart showing an outline of processing of the called terminal station. However, each figure has shown the part of the process mainly related to this invention.
[0197]
When the extension key arranged in the key matrix 211 is pressed in the radio telephone 103-A (S6801), the radio telephone 103-A transmits an HP acquisition request signal (6601) using the LCCH by the central control station HP. (S6802).
[0198]
The central control station determines that the signal has been received (S6701), and determines that the signal is an HP acquisition request (S6702), checks whether there is an HP resource (S6705), and if there is an HP for the request Is secured (S6706), and the HP is notified (S6707).
[0199]
If it is determined that the wireless telephone 103-A has received the HP notification (6602) (S6803), the wireless telephone 103-A asks the user for a dial tone (DT) from the wireless telephone itself (S6804). If the centralized control station determines that there is no resource in S6705, the centralized control station issues a communication failure notification (S6708), and the wireless telephone 103-A that has received the notification cannot communicate with the user. Is notified by sound or display (S6818).
[0200]
The user of the radio telephone 103-A who has heard the dial tone inputs information (address) indicating the radio telephone 103-B that is the call destination from the key matrix 211 (dial tone stop). Then, the wireless telephone 103-A transmits a connection request (6603) to the wireless telephone 103-B using the LCCH by the centralized control station HP (S6805). At that time, HP information received from the central control station is also notified.
[0201]
The wireless telephone 103-B waits for reception at the HP of the central control station, and when receiving the connection request (S6901), the wireless telephone 103-B concentrates connection confirmation (6604) on the other party (calling side) that transmitted the request signal. It transmits using LCCH by HP of a control station (S6902). Thereafter, the radio telephone 103-B switches the HP to communicate using the HP notified from the radio telephone 103-A.
[0202]
Upon receiving the connection confirmation (S6806), the wireless telephone 103-A transmits a connection completion signal (6605) to the central control station using the LCCH using the central control station HP (S6807). Know that a wireless link has been established.
[0203]
When the radio link is established between the extensions, the radio telephone 103-A switches the HP to the HP notified from the central control station, and transmits a call setting (6606) signal to the radio telephone 103-B. This signal is also transmitted with the address of the wireless telephone 103-B (S6808), and a ring back tone (RBT) is heard from the speaker 210 to inform the user that the call is in progress (S6820).
[0204]
Upon receiving the call setting (S6903), the receiving side wireless telephone number information 103-B displays a sound (ringing tone) from the speaker 210 or a display 211 that notifies the incoming call (S6910). The user of B is prompted to respond.
[0205]
When the user of the wireless telephone 103-B performs 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 (S6904). ). At this time, the radio telephone number information 103-B enters a call state (S6905), stops the incoming call notification, turns on the speaker 210 and the microphone 209, and prepares for the call. Here, the address of the caller's wireless telephone 103-A may be displayed on the display unit 211.
[0206]
On the other hand, when the wireless telephone 103-A receives the response (6607) from the wireless telephone 103-B (S6809), the ringback tone is stopped, the speaker 210 and the microphone 209 are turned on, and the telephone is busy (S6810). .
[0207]
The wireless telephone 103-A monitors whether the user has performed a call termination operation such as on-hook or received a release from the wireless telephone 103-B (S6811). It is monitored whether the user performs an operation for ending the call such as on-hook or has received a disconnection from the radio telephone 103-A (S6906).
[0208]
When the user of the wireless telephone 103-A performs a call termination operation, the wireless telephone 103-A transmits a disconnection (6608) (S6812), and turns off the microphone 209 and the speaker 210. When the wireless telephone 103-B receives the disconnection, the microphone 209 is turned off and the speaker 210 stops outputting the voice from the other party, and outputs a busy tone instead to notify that the other party has disconnected (S6912). The user is prompted to go off-hook with the wireless telephone 103-B. Waiting for the user of the wireless telephone 103-B to perform an off-hook operation (S6913), the wireless telephone 103-B transmits a release (6609) (S6907) and ends the call.
[0209]
Upon receiving the release (S6813), the wireless telephone 103-A assumes that the call has been completely terminated, and then transmits a release request (6610) to disconnect the wireless link (S6814).
[0210]
Upon receiving the release request (6610) (S6908), the wireless telephone 103-B transmits a release confirmation (6611) (S6909), stops transmitting radio waves, and disconnects the wireless link.
[0211]
Upon receiving the release confirmation (6611) (S6815), the wireless telephone 103-A switches the HP to the HP of the central control station, and transmits the HP release request (6612) used for the central control station (S6816). When the central control station determines that the release request has been received (S6703), it releases the HP and transmits an HP release notification (6613) to the wireless telephone 103-A (S6704). Upon receiving the HP release notification (S6817), the wireless telephone 103-A disconnects the wireless link, stops transmission / reception of radio waves, and ends communication.
[0212]
The direct call between extensions can be realized by the above procedure.
[0213]
5. Data communication processing between wireless terminals
FIG. 37 is an explanatory diagram showing a data communication sequence in the present embodiment. FIG. 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 data transmission operation of the communication terminal in this embodiment. Furthermore, FIG. 40 is a flowchart showing the data reception operation of the communication terminal in this embodiment, and FIG. 41 is a flowchart showing the operation of the wireless terminal 110 at the time of disconnection in the data communication in this embodiment.
[0214]
When a transmission operation is performed at the transmitting terminal station of the wireless terminal 110 (S7701), an HP acquisition request 7601 is transmitted to the centralized control station (S7702). When an HP notification 7602 is received from the centralized control station (S7703), a connection request 7603 is transmitted to the receiving terminal station to notify the HP used in communication (S7704).
[0215]
When a connection confirmation 7604 is received from the receiving terminal station (S7705), a connection completion 7605 is transmitted to the central control station, and the call connection is terminated (S7706). When the call connection is completed, data communication is performed. In this embodiment, data transmission from the calling terminal station will be described.
[0216]
When 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 (S7802). If there is no request, it is checked whether there is a data transmission request from the terminal (S7807).
[0217]
If there is a transmission request, the requested data number is entered in the transmission counter (S7808), and the data 7606 of the number in the transmission counter is transmitted (S7809). If a retransmission request 7607 is received, the retransmitted data number is designated (S7803), and the data of the designated number is transmitted (S7804).
[0218]
If the designated data number is smaller than the transmission counter data (S7805), the next number data is designated (S7806), and the designated data is transmitted (S7804). If the designated data number matches the transmission counter number (S7806), the normal transmission state is restored. If a disconnection request is received from the terminal (S7810), the transmission is terminated.
[0219]
When communication is started, the receiving terminal station first resets the reception counter to 0 (S7901). When data is received (S7902), it is checked whether the data is corrupted (S7903). If the data is not broken, the data number is then checked (S7904), and it is checked whether the data number is the number next to the reception counter number (S7905).
[0220]
If the data is received in the correct order, the data is sent to the terminal (S7907), and the data number is entered in the reception counter (S7908). Also, if the data is broken or data is missing and cannot be received in order, a retransmission request 7607 is transmitted (S7906). When a disconnection request is received from the wireless device side (7909), the reception is terminated.
[0221]
When the terminal receives a disconnection request from the terminal and enters the disconnection phase (S8001), it transmits a line disconnection notification 7608 to the receiving terminal station (S8002), and when a line disconnection confirmation 7609 is received (S8003), the central control station The HP release 7610 is transmitted to release the HP used in step S8004. When HP release confirmation 7611 is received, the disconnection is terminated.
[0222]
As described above, the voice channel and the data channel of the conventional radio frame are combined into a voice / data channel, and a means for discriminating the contents stored in the voice / data channel is provided in the radio frame. Therefore, when performing communication only for voice or data, in the case of voice communication, the voice / data channel is used as the voice channel, and in the case of data communication, the voice / data channel is used as the data channel. The communication efficiency of the wireless communication system can be improved, and the power consumption of the wireless terminal can be reduced in the communication of one wireless frame between the wireless terminals.
[0223]
【The invention's effect】
  According to the present invention, since information indicating the presence / absence of voice and information indicating the presence / absence of data is added to the radio frame and transmitted, not only the presence of voice and data but also the absence of voice and data can be notified. The receiving-side apparatus that has received such information can perform reception processing that also uses information indicating that voice and data are not present in the radio frame, and can improve communication efficiency. Play.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a system configuration in an embodiment of the present invention.
FIG. 2 is a block diagram showing an internal configuration of the radio telephone according to the embodiment.
FIG. 3 is a block diagram illustrating an internal configuration of the wireless adapter according to the embodiment.
FIG. 4 is a block diagram illustrating an internal configuration of the network control apparatus according to the embodiment.
FIG. 5 is a block diagram illustrating an internal configuration of a radio unit according to the embodiment.
FIG. 6 is a block diagram showing an internal configuration of the PSTN board of the embodiment.
FIG. 7 is a block diagram showing an internal configuration of the PC board of the embodiment.
FIG. 8 is a block diagram showing an internal configuration of a communication interface unit of the embodiment.
FIG. 9 is a block diagram illustrating a channel configuration inside a frame according to the embodiment.
FIG. 10 is a block diagram showing an internal configuration of each channel in the embodiment.
FIG. 11 is a block diagram showing a channel configuration inside 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 voice channel hopping and transmission / reception states of the embodiment.
FIG. 14 is an explanatory diagram showing an example of frequency hopping in the embodiment.
FIG. 15 is an explanatory diagram showing the frequency usage status of each channel in inter-terminal voice / data communication according to the embodiment.
FIG. 16 is a block diagram showing a configuration of a channel codec board of the embodiment.
FIG. 17 is an explanatory diagram showing a frequency usage state of each channel in the inter-terminal voice communication of the embodiment.
FIG. 18 is an explanatory diagram showing a frequency usage state of each channel in inter-terminal data communication according to the embodiment.
FIG. 19 is an explanatory diagram showing an HP allocation sequence according to the embodiment.
FIG. 20 is a flowchart showing an HP allocation operation according to the embodiment.
FIG. 21 is a flowchart showing an HP release operation of the embodiment.
FIG. 22 is a flowchart showing an HP changing operation of the embodiment.
FIG. 23 is an explanatory diagram showing a power-on sequence between the central control station and the terminal station in the embodiment.
FIG. 24 is a flowchart showing an operation at power-on in the centralized control station of the embodiment.
FIG. 25 is a flowchart showing an operation at the time of new registration of a terminal station in the centralized control station of the embodiment.
FIG. 26 is a flowchart showing an operation at power-on in the terminal station of the embodiment.
FIG. 27 is an explanatory diagram showing a sequence when an outside line is transmitted in the embodiment.
FIG. 28 is a flowchart showing the operation of the network control device when an outside line is transmitted in the embodiment.
FIG. 29 is a flowchart showing the operation of the wireless terminal device when an outside line is transmitted in the embodiment.
FIG. 30 is an explanatory diagram showing a sequence when an outside line is received in the embodiment.
FIG. 31 is a flowchart showing the operation of the network control device when an outside line is received in the embodiment.
FIG. 32 is a flowchart showing the operation of the wireless terminal device at the time of incoming call of 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 embodiment.
FIG. 34 is a flowchart showing an outline of processing of the centralized control station of the embodiment.
FIG. 35 is a flowchart showing an outline of processing of the calling terminal station in the embodiment.
FIG. 36 is a flowchart showing an outline of processing of the called terminal station in the embodiment.
FIG. 37 is an explanatory diagram showing a data communication sequence in the embodiment.
FIG. 38 is a flowchart showing an operation of the wireless terminal 110 when connected in data communication in the embodiment.
FIG. 39 is a flowchart showing an operation at the time of data transmission of the communication terminal in the embodiment.
FIG. 40 is a flowchart showing an operation at the time of data reception of the communication terminal in the embodiment.
FIG. 41 is a flowchart showing an operation of the wireless terminal 110 when disconnected in data communication in the embodiment.
[Explanation of symbols]
101. Network control device
102 ... Public line,
103 ... wireless telephone,
104: Computer,
105 ... multimedia terminal,
106: Printer,
107: facsimile,
108 ... copier,
109: LAN gateway.

Claims (4)

In a wireless communication system,
When a voice / data area is stored in a radio frame to be transmitted as one voice / data area and only voice or data is communicated, only the voice or data is stored in the area and voice and data are communicated. In the case, the adding means for storing voice and data in the area, and further adding information indicating the presence or absence of voice and information indicating the presence or absence of data to the wireless frame ;
Transmitting means for transmitting a radio frame to which information indicating the presence / absence of the voice and information indicating the presence / absence of data are added by the adding means;
Wireless communication system, comprising a. In claim 1,
The wireless terminal that has received the wireless frame recognizes the type of information stored in the wireless frame based on the information indicating the presence / absence of voice and the presence / absence of data, and recognizes that the type of information is only voice. In this case, the contents stored in the voice / data area are received as voice, and when the information type is recognized as data only, the contents stored in the voice / data area are received as data. A wireless communication system comprising means for receiving contents stored in a voice / data area as voice and data when the type of information is recognized as voice and data. In claim 1 or 2,
The wireless communication system is a system that performs communication using a frequency hopping method,
A wireless communication system, wherein communication is performed using a hopping pattern corresponding to a type of information stored in the area. In the wireless communication method,
When a voice / data area is used as an area for storing voice and data in a radio frame to be transmitted and only voice or data is communicated, only voice or data is stored in the area, and voice and data are communicated. In the case, an adding step of storing voice and data in the area and further adding information indicating the presence or absence of voice and information indicating the presence or absence of data to the radio frame ;
A transmission step of transmitting a radio frame to which information indicating the presence / absence of voice and information indicating the presence / absence of data is added in the adding step;
Wireless communication method characterized by having a.

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