JP3604803B2 - Wireless communication device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention communicates using a frequency hopping schemeWireless communication deviceAbout.
[0002]
[Prior art]
2. Description of the Related Art In recent years, digital wireless communication systems have been put into practical use, and among them, spread-spectrum communication has received particular attention. Spread-spectrum communication is known as a technique that spreads information to be transmitted over a wide band, has a high interference removal capability, and is excellent in secrecy. 2.4 GHz band frequencies are allocated for spread spectrum communication in various countries around the world, and are spreading worldwide.
[0003]
The spread spectrum communication schemes are roughly classified into frequency hopping (FH scheme) and direct spread (DS scheme). The former performs transmission using a wide band by dividing the usable frequency band into a plurality of frequency channels having a certain bandwidth and changing the modulation frequency within a certain time. A wide band is used by spreading and modulating information with a pseudo noise code at a rate ten to several hundred times that of the information.
[0004]
Among them, many systems using frequency hopping have already been proposed because they can be realized with a relatively simple circuit configuration. For example, in a wireless LAN or the like, control is performed such that data is assembled into packets and the frequency is changed for each packet.
[0005]
In such a system, in order to prevent mutual interference, it is necessary that all terminals accommodated in the system simultaneously switch frequencies. For this purpose, a dedicated central control station for generating frequency switching timing is provided, and all terminals operate in synchronization with the timing generated by the central control station.
[0006]
[Problems to be solved by the invention]
However, in the system using the frequency hopping in the above-described conventional example, it is necessary to always provide a dedicated central control station for generating the frequency switching timing, and thus has the following problems.
[0007]
1. If the central control station fails, the system cannot operate until a new central control station is installed.
[0008]
2. It is necessary to provide a central control station, which is not always necessary for communication, and it is necessary to secure extra space and make an investment.
[0009]
The present inventionEliminates the need for a dedicated central control stationThe purpose is to:
[0010]
[Means for Solving the Problems]
The present invention provides, in a wireless communication device that performs communication using a frequency hopping method, a setting unit that sets an operation mode based on a user operation, and a setting unit that sets another operation mode of the wireless communication device according to the setting of the operation mode by the setting unit. A switching unit that generates a frequency switching timing serving as a reference for frequency switching and switches a frequency according to the timing, and a transmission unit that wirelessly transmits information indicating the frequency switching timing at the frequency switched by the switching unit. A wireless communication device is provided.
[0013]
According to the present invention, a dedicated centralized control station can be dispensed with.
[0014]
That is, since the control station that wirelessly transmits information serving as a reference for frequency switching timing can be easily changed, the network can be easily restored even if the control station breaks down. Furthermore, since information serving as a reference for frequency switching timing is wirelessly transmitted, a wired line or the like for notifying a frequency switching timing signal is not required, and an apparatus to which the wired line is not connected can be a control station.
[0016]
Embodiments and Examples of the Invention
FIG. 1 is an explanatory diagram illustrating a configuration of a wireless communication system according to an embodiment of the present invention.
[0017]
The wireless communication system according to the present embodiment includes wireless terminals having various functions, has a public line interface accommodating the public line 101, and provides a public network communication service to a terminal station in the system. A network controller 102, a wireless telephone 103 accommodated in an extension of the network controller 102, a personal computer 104 to which a wireless PC card is connected, a printer 105 to which a wireless print buffer is connected, and an Ethernet And a wireless LAN adapter 106 having an interface.
[0018]
FIG. 2 is a block diagram showing the configuration of the wireless control unit mounted on each terminal as described above.
[0019]
The wireless control unit includes a data input / output interface 201 such as a PCMCIA interface, Centronics, Ethernet, etc., a voice input / output interface 202 such as a handset interface or a public network interface, an error correction processing unit 203, and a CPU 204 for controlling the entire unit. , A memory 205 for storing programs and data, a DMA controller 206 for performing DMA transfer, an ADPCM codec 207 for converting between analog voice information and ADPCM codes, and a channel for performing scrambling and frame processing of ADPCM code information. A codec unit 208, a radio unit 209 for performing modulation / demodulation processing of transmission / reception signals, a data bus 210, and an operation mode input unit 2 for setting an operation mode which is a function according to the present invention. Having one and.
[0020]
The operation mode input unit 211 is a switch in the case of a terminal without a display unit such as a printer or a network control device, and is a switch in the case of a terminal with a display unit and a key operation unit such as a personal computer or a telephone. The input unit is a key operation unit.
[0021]
By changing the interface, the wireless control unit having the same configuration can be used for various types of terminals.
[0022]
FIG. 3 is a block diagram showing a configuration of the channel codec 208.
[0023]
In the figure, a channel codec 208 includes a CPU bus interface 303 to which a CPU bus 301 is connected, an ADPCM interface 304 for exchanging ADPCM encoded audio data with the ADPCM codec 207, and a mode for setting an operation mode. It has a register 305, a hopping pattern register 306, a frame number / next frequency number (BF / NF) register 307, a system ID register 308, an intermittent activation terminal address register 309, an LCCH register 310, and a FIFO buffer 311. .
[0024]
Also, a timing generation unit 312, a CNT channel assembling / disassembling unit 313, an LCCH assembling / disassembling unit 314, a data assembling / disassembling unit 315, a voice assembling / disassembling unit 316, a frame synchronizing unit 317, a unique word detection The analog reception signals from the radio section 318, the CRC encoding / decoding section 319, the bit synchronization section 320, the radio control section 321, the intermittent reception control section 322, the scramble / descramble 323, and the radio section 209 An AD converter 324 that converts the signal into a signal and a reception level detection unit 325 that detects a reception level based on an input from the AD converter 324 and outputs an interrupt signal 326 are provided.
[0025]
FIG. 4 is a block diagram showing a wireless unit having a common configuration in the wireless terminals of the present system.
[0026]
The transmitting / receiving antennas 401a and 401b are for transmitting and receiving wireless signals efficiently, and the changeover switch 402 is for switching between the antennas 401a and 401b. A band pass filter (hereinafter, referred to as BPF) 403 is for removing signals in unnecessary bands, and a changeover switch 404 is for switching between transmission and reception.
[0027]
The amplifier 405 is a receiving system amplifier, and the amplifier 406 is a transmitting system power control amplifier. The converter 407 includes the 1st. It is a down converter for IF, and converter 408 is an up converter.
[0028]
The changeover switch 409 is for switching between transmission and reception, and the BPF 410 is for removing a signal in an unnecessary band from the signal converted by the downconverter 407. Converter 411 has 2nd. This is a down converter for the IF, and a reception form of a double conversion system is configured by two down converters 407 and 411.
[0029]
BPF412 has a 2nd. For the IF, the 90-degree phase shifter 413 shifts the output phase of the BPF 412 by 90 degrees. The quadrature detector 414 detects and demodulates the signal received by the BPF 412 and the 90-degree phase shifter 413. Further, the comparator 415 is for shaping the waveform of the output of the quadrature detector 414.
[0030]
Further, a voltage-controlled oscillator (hereinafter, referred to as VCO) 416, a low-pass filter (hereinafter, referred to as LPF) 417, and a PLL 418 including a programmable counter, a prescaler, a phase comparator, etc. A frequency synthesizer is configured.
[0031]
Further, a VCO 419 for generating a carrier signal, an LPF 420, and a PLL 421 including a programmable counter, a prescaler, a phase comparator, and the like constitute a frequency synthesizer for hopping.
[0032]
Further, a transmission system frequency synthesizer having a frequency modulation function is configured by the transmission system VCO 422 having a modulation function, the LPF 423, and the PLL 424 including a programmable counter, a prescaler, a phase comparator, and the like.
[0033]
The reference clock oscillator 425 supplies a reference clock for the various PLLs 418, 421, and 424, and the baseband filter 426 is a filter for limiting the band of transmission data (baseband signal).
[0034]
FIG. 5 is an explanatory diagram showing a radio frame used in the present system.
[0035]
In the figure, one frame has a length of 6250 bits (10 ms), and a total of five time-division multiplexed channels including a CNT (system control) channel, an LCCH (logical control channel) channel, two voice data channels, and a data channel. And a frequency switching section.
[0036]
The CNT channel includes a carrier sense section (CS), a preamble (PR), a frame synchronization word section (SYN) for the receiving terminal to maintain frame synchronization, and a method for receiving only data from a central control station belonging to the same system. Update of the hopping pattern register 308, the system ID part (ID), the frame number information part (BF) used for controlling the hopping pattern, the intermittent terminal activation address part (WA) for activating the terminal during the intermittent reception. It comprises a next frame frequency section (NF), a CRC section (CRC), and a guard time (GT) for performing.
[0037]
The LCCH channel includes a carrier sense section (CS0, CS1, CS2), a preamble section (PR), a unique word section (UW), a system ID section (ID), a transmission address section (DA), an LCCH control data section (Data), It comprises a CRC section (CRC) and a frequency switching section (CF).
[0038]
The audio channel includes a carrier sense section (CS), a preamble section (PR), a unique word section (UW), a system ID section (ID), an audio data section (T / R), and a CRC section (CRC).
[0039]
The data channel includes a carrier sense section (CS0, CS1, CS2), a preamble section (PR), a unique word section (UW), a system ID section (ID), a transmission address section (DA), and a data section (Data). You.
[0040]
In this embodiment, the CNT channel and the LCCH channel use the first hopping pattern, the two voice data channels use the second hopping pattern, and the data channel uses the third hopping pattern.
[0041]
FIG. 6 is an explanatory diagram illustrating the concept of frequency hopping used in the present system.
[0042]
In the system of the present embodiment, 26 frequency channels of 1 MHz width using a 26 MHz band approved for use in Japan are used. Then, in consideration of a case where there are frequencies that cannot be used due to interference noise or the like, 20 frequency channels are selected from the 26 channels, and frequency hopping is performed on the selected frequency channels in a predetermined order.
[0043]
In this system, one frame has a length of 10 ms, and the frequency channel is hopped for each frame. Therefore, the length of one cycle of one hopping pattern is 200 ms.
[0044]
In FIG. 6, different hopping patterns are indicated by different patterns. As described above, by using a pattern in which the same frequency is not used at the same time in each frame, it is possible to prevent a data error from occurring.
[0045]
In this system, the first hopping pattern is used for the CNT channel and the LCCH channel, the second hopping pattern is used for the voice channel, and the third hopping pattern is used for the data channel. Control is performed so that the same frequency is not used at the same time. This makes it possible to transmit and receive data to and from a different communication partner for each channel.
[0046]
In order to reduce the number of hopping patterns held in the channel codec, hopping patterns used in each channel are generated by time-shifting a pattern in which frequencies are arranged in the same order.
[0047]
FIG. 7 is an explanatory diagram illustrating the concept of four channels and frequency hopping used in the present system. This shows how the control channel, voice channel, and data channel hop independently.
[0048]
Hereinafter, the basic operation of the wireless control unit will be described with reference to FIGS.
[0049]
(Operation mode setting at installation)
Among the terminals shown in FIG. 1, the wireless telephone and the personal computer have a display unit and a data input unit as an operation mode input unit 211, and the other terminals have an operation mode setting switch. Therefore, when the system is installed, it is necessary to set one of the terminals accommodated in the system as a central control station by using the display unit, the data input unit, or the switch.
[0050]
Specifically, when the wireless telephone or the personal computer is started up, the display unit displays "Please set the operation mode. 1. Central control station 2. Terminal station". The operation mode is set by inputting the number of the operation mode to be set from the data input unit.
[0051]
Other terminals have an on / off switch built-in, so in the case of a central control station, the switch is turned to the on side, and in the case of a terminal station, the switch is turned to the off side to set the operation mode. Is set. Also, the mode once set is retained until a new setting is made.
[0052]
The terminal that has become the central control station generates the reference timing of the transmission frame, and performs call control and management / allocation of a hopping pattern. The terminal station operates based on the timing generated by the central control station, and issues a transmission request or a hopping pattern assignment request to the central control station when starting communication. The details of the operation will be described in the description of the operation of the channel codec and the like.
[0053]
(Transmission data type)
Data to be transmitted is roughly divided into three types.
[0054]
First, control data for performing call control such as an outgoing call request. This is generated according to a program stored in the ROM, and is written to the channel codec 208 via the CPU data bus.
[0055]
The second is real-time data such as voice. This data is input from the audio input / output interface 202, the analog audio is converted into a digital code by the ADPCM codec 207, and is taken into the channel codec 208 at a predetermined timing.
[0056]
The third is non-real-time data sent from the memory 205 of the personal computer body. This data is input from the data input / output interface 201 and stored in the memory 205 by DMA transfer. When a predetermined amount of data is stored in the memory 205, the data is encoded by an error correction processing unit (ECC) 203 and then DMA-transferred to a channel codec 208.
[0057]
When these data are received, the flow is completely reversed.
[0058]
(Explanation of channel codec operation)
The channel codec 208 has a function of assembling data into the frame format shown in FIG. 5 or disassembling a frame and sending the data to the input / output interface 201. Hereinafter, the operation of the channel codec 208 will be described.
[0059]
First, the reference of the operation timing of the channel codec 208 is generated by the timing generation unit on the central control station side. The central control station transmits a frame in accordance with the reference timing, and the terminal station receiving the frame maintains frame synchronization in accordance with a frame synchronization word.
[0060]
In this way, the frame synchronization based on the reference timing in the central control station is performed, and the frequency between the central control station and the terminal station is determined based on the synchronization pulse included in the above-described frequency switching unit (CF) in the frame. The switching timing is synchronized, and a synchronized frequency switching operation is performed in the entire system.
[0061]
Next, data sent from the central control station via the CNT channel is stored in a register inside the channel codec 208. Inside the channel codec 208, there are an HP register 306, an ID register 308, and a WA (starting terminal address) register 309. On the central control station side, the CPU 204 writes necessary values to these registers.
[0062]
The value in the frame number / next frame frequency number (BF / NF) register 307 is updated in synchronization with the operation timing. The frequency number written in the NF register is a hopping pattern (first hopping pattern) of the CNT channel. The channel codec 208 reads out the data in these registers at the timing of transmitting the CNT channel data, and the CNT assembling unit 312 assembles the data to transmit.
[0063]
On the other hand, in the terminal station, upon receiving the CNT channel, the CNT is decomposed by the CNT decomposing unit 312, and processing is performed using the received values of each unit. Only when the received system ID matches the value written in the ID register 306 of the own station, control is performed so as to receive the subsequent data. If the received WA matches the value of the WA register 307 of the local station during intermittent reception, a start request interrupt is generated. Further, the table of the hopping pattern register 308 is rewritten using the received BF and NF information data.
[0064]
Since the frequency number assigned to the NF field is that of the hopping pattern of the CNT channel, the hopping pattern used for the voice channel and the data channel is a hopping pattern register created based on the frequency number written in the NF field. Is generated by time shifting.
[0065]
In the LCCH channel, data stored in the LCCH register 310 inside the channel codec 208 by the CPU 204 of the transmitting terminal is assembled by the LCCH assembling / disassembling unit 314 and transmitted at a predetermined timing. In order to prevent collision with other terminals, a plurality of carrier sense fields are provided. The received LCCH data is disassembled by the LCCH assembling / disassembling unit 314 and once stored in the LCCH register 310, an interrupt is generated for the CPU 204, and the CPU 204 reads the data.
[0066]
In the voice channel, data input via the ADPCM interface 304 is assembled by the voice assembling / disassembling unit 316 and transmitted at a predetermined timing. Conversely, the received voice data is decomposed at a predetermined timing by the voice assembling / decomposing unit 316 and output at the timing of the ADPCM codec 207 via the ADPCM interface 304.
[0067]
In the data channel, data is transmitted only when the CPU 204 makes a data transmission request. When a data transmission request has been made, the CPU bus interface 303 of the channel codec 208 outputs a DMA request at a timing of one byte. When data is written in response to the DMA request by the DMA controller 206, the data assembling / disassembling unit 315 converts the data into serial data and transmits the data at a predetermined timing.
[0068]
Conversely, when data is received, the data assembling / disassembling unit 315 converts the data into parallel, outputs a DMA request for each byte, and the DMA controller 206 transfers the received data to the memory 205. When the transfer of one frame of data is completed, an interrupt is generated for the CPU 204.
[0069]
At the time of data transmission, a CRC code generation unit 318 generates a CRC code as necessary, stores the CRC code in a CRC field, and transmits the CRC code. The receiving side can perform a CRC check to detect the occurrence of an error. In addition, all transmission data other than the frame synchronization word and the unique word are scrambled by the scrambler 322. This is to reduce the unbalance of the data sent to the radio unit 209 and to facilitate the synchronization clock extraction.
[0070]
Conversely, upon data reception, when a unique word is detected, descrambling is performed by the descrambler 322 at that timing, a CRC check is performed, and at the same time, data is input to the decomposing unit of each field.
[0071]
(Explanation of operation example)
As described above, in the present system, a frame composed of a plurality of channels is prepared for communication between terminals, and control is performed to switch the frequency to be used at regular intervals.
[0072]
The following describes the specific operation of this system when the personal computer performs file transfer with another personal computer while performing voice communication via the network control device using a handset connected to the personal computer. I do. In this example, a description will be given assuming that the network control device functions as a central control station.
[0073]
FIG. 8 is an explanatory diagram showing an operation sequence of the control station and the terminal station when the power is turned on in this system, and FIG. 9 is an explanatory diagram showing a call control sequence up to the start of data communication or voice communication. FIG. 10 is a flowchart showing the transmission control operation in the personal computer, and FIG. 11 is a flowchart showing the transmission control operation in the central control station. FIG. 12 is a flowchart showing the data transmission operation. Hereinafter, description will be given with reference to these figures.
[0074]
《Sequence of control station and terminal station when power is turned on》
First, when the power is turned on in S1001 in FIG. 8 and the terminal is initialized, the terminal determines whether the terminal itself is a control station or a terminal station. A hopping pattern is determined, a synchronizing signal, hopping pattern information, own area number, and the like are assembled into a frame, and output as a CNT frame at predetermined timing.
[0075]
Similarly, when the terminal is recognized as the terminal station after the terminal is started, the address of the terminal and the area number of the control station to be received are stored. When this process is completed, a CNT frame from the control station is waited at an arbitrary frequency. When a CNT frame is received from the control station, a frequency to be hopped in the next unit time is acquired based on the NF in the frame.
[0076]
The terminal station changes the reception frequency based on the received frequency and waits for the next CNT frame. The terminal station repeats this process, recognizes the hopping pattern used by the control station, and stores it.
[0077]
When the storage of the hopping pattern is completed in the terminal station, the terminal station notifies the terminal station that it is newly added as a terminal station by using an LCCH frame in S1002. At this time, the global address to be received by all terminals is entered in the DA of the LCCH frame, and data indicating that new registration is to be performed is transmitted in the data portion.
[0078]
The control station receives the LCCH frame and, if there is a DA global address in it, receives the data in the data section. If there is a terminal station address and a registration request signal, the terminal station performs The address is stored and newly registered.
[0079]
When this registration is completed, in S1003, the control station notifies the newly registered terminal station of the address of the control station using an LCCH frame. When the terminal station receives the address of the control station in the LCCH frame, the terminal station stores the address of the control station. After this processing is completed, the terminal station notifies the control station of the start-up completion using the LCCH frame in S1004. When the control station receives the start-up completion notification from the terminal station, it shifts to a normal process.
[0080]
After outputting the start-up completion notification, the terminal station can make a call from the terminal station in S1005.
[0081]
《Voice communication》
First, the voice communication application program of the personal computer is started (S1202). Then, the wireless unit driver installed in the personal computer operates to send a voice transmission request and a destination number (extension number of the other terminal) to the wireless control unit via the data input / output interface 201 (S1203).
[0082]
Next, the wireless control unit enters a calling procedure. Here, a transmission request command is written as LCCH data in the LCCH register 309 in the channel codec 208 (S1204), the central control station address is written in the destination address register (S1205), and the mode register 305 of the channel codec 208 is stored in the LCCH register 309. The transmission mode is set (S1206).
[0083]
At the time of LCCH transmission, carrier detection is performed using the carrier sense field in the channel codec 208 (S1207). If a carrier is detected during this time, it is considered that another terminal is using the LCCH channel, and contention control is performed to stop data transmission until the next frame (S1208).
[0084]
If the carrier is not detected, it is considered that the other terminals do not use the LCCH channel, and thus, transmission of data to the central control station is started (S1209). The hopping pattern used for transmitting the LCCH data uses the first hopping pattern as in the case of the CNT channel.
[0085]
The central control station that has received the transmission request command performs transmission processing such as dialing on the public line. If there is a response from the partner terminal via the public line, an incoming call notification command is sent to the personal computer which made the call request using the LCCH. Furthermore, a notification of a hopping pattern (second hopping pattern) number when voice data is exchanged between the personal computer and the central control station in the future, and which of the two voice channels to use as the transmission side Make a notification.
[0086]
On the personal computer side having received the above-mentioned incoming call notification, hopping pattern, and allocation of the channel to be used, the hopping pattern number used in the voice communication channel and the channel to be used are set in the channel codec 208, and the operation of the ADPCM codec 207 is performed. The process starts (S1401 to S1404).
[0087]
By the above procedure, a link between the personal computer, the public line gateway, and the partner terminal is established, and a call between the personal computer and the partner terminal is started (S1405).
[0088]
During the voice communication, the voice input from the personal computer handset is encoded by the ADPCM codec 207, and the encoded data is input to the channel codec 208, and a preamble and a unique word are added every 160 bits. After scrambling, transmission is performed at a predetermined voice channel position.
[0089]
On the other hand, when receiving, the bit synchronization is established in the preamble section of the data received on the voice channel, and when a unique word is detected, descrambling is performed. The descrambled data is encoded by the ADPCM codec 207 and output as audio from the speaker of the handset.
[0090]
"data communication"
First, a data communication application program of the personal computer is started (S1202). Then, the wireless unit driver installed in the personal computer operates to send a data transmission request and a destination number (extension number of the partner terminal) to the wireless control unit via the data input / output interface unit 201 (S1203).
[0091]
Next, the radio control unit enters a transmission procedure as in the case of voice communication, and starts transmitting LCCH data to the central control station.
[0092]
The central control station that has received the transmission request command notifies the other terminal of the incoming call similarly using the LCCH and, when a response is returned from the other terminal, sends a hopping pattern (third hopping pattern) for data transmission and reception to the two terminals. The call setting is completed by transmitting the number (S1209).
[0093]
When the two terminals obtain the hopping pattern for data transmission and reception by the above procedure, they set the hopping pattern number used for the channel codec 208 (S1211), and switch the frequency in the data channel according to the given hopping pattern. Data transmission and reception are performed (S1213). That is, the wireless control unit driver transfers data to be transmitted from the memory 205 of the personal computer to the memory 205 in the wireless control unit (S1302).
[0094]
The wireless control unit performs error correction coding on the data stored in the memory 205 and stores the data in the memory 205 again (S1303). Thereafter, a DMA transfer address from the memory 205 to the channel codec 208 is set to the DMA controller (S1304), and a transmission request is set to the mode register 305 of the channel codec 208 (S1305).
[0095]
The channel codec 208 that has received the transmission request generates a DMA request in units of one byte in accordance with the timing of the data channel. Upon receiving the DMA request, the DMA controller 206 transfers the data in the memory 205 to the channel codec 208. The channel codec 208 adds a preamble and a unique word, and scrambles the transmission (S1308).
[0096]
Prior to transmission, the channel codec 208 performs contention control using the same carrier sense as in the case of the LCCH to prevent data collision (S1306, S1306).
[0097]
When transmission for one bucket is completed (S1309), an interrupt is generated for the CPU 204 (S1310). If there is more data to be transmitted (S1311), the process returns to S1304 to perform transmission again.
[0098]
When there is no data to be transmitted, the mode register 305 of the channel codec 208 is set to the reception mode and the reception is waited (S1312). In the receiving-side wireless control unit, the DMA controller is set in advance to a transfer mode from the channel codec 208 to the memory 205. In the channel codec 208, in the preamble section of the received data, a DMA request is generated in byte units. Upon receiving the DMA request, the DMA controller 206 transfers data from the channel codec 208 to the memory 205 (S1313, S1314).
[0099]
When the transfer of data for one bucket is completed, a reception completion interrupt is generated from the channel codec 208, and the CPU 204 performs an error correction decoding process on the data stored in the memory 205 to obtain final reception data. Therefore, this data is transferred to the personal computer (S1315).
[0100]
By the above procedure, data transmission can be performed. Further, if there is data to be transmitted, an unlimited amount of data can be transmitted by repeating the same procedure (S1316).
[0101]
<< Process when changing the central control station >>
The function of the present invention works most effectively when it is necessary to change the central control station. For example, in the above system, it is assumed that the network control device used as the central control station breaks down for some reason. In this case, if the personal computer in the system is restarted and the central control station is selected on the operation mode setting screen, thereafter, the system operates using the personal computer as the central control station.
[0102]
In this operating state, voice communication access to the public network is not possible, but data communication between personal computers is possible.
[0103]
《Summary》
Thus, by operating one of the terminals in the system as a central control station, the operation of the frequency hopping system can be performed without providing a dedicated central control station. Further, even if a terminal used as a central control station breaks down, it is possible to provide a highly secure system that does not affect the operation of the entire system.
[0104]
In the first embodiment, the network controller is initially selected as the central control station, and thereafter, the personal computer is switched as the central control station. Can be expected. However, since the central control station needs to constantly transmit a timing signal, it is desirable to select a terminal that is unlikely to be turned off and a terminal that is unlikely to move.
[0105]
【The invention's effect】
Since the control station that wirelessly transmits information serving as a reference for frequency switching timing can be easily changed, the network can be easily restored even if the control station breaks down. Furthermore, since information serving as a reference for frequency switching timing is wirelessly transmitted, a wired line or the like for notifying a frequency switching timing signal is not required, and an apparatus to which the wired line is not connected can be a control station.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram illustrating a configuration of a wireless communication system according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of a wireless control unit in the embodiment.
FIG. 3 is a block diagram showing a configuration of a channel codec in the embodiment.
FIG. 4 is a block diagram showing a configuration of a wireless unit in the embodiment.
FIG. 5 is an explanatory diagram showing a radio frame used in the embodiment.
FIG. 6 is an explanatory diagram showing the concept of frequency hopping used in the embodiment.
FIG. 7 is an explanatory diagram showing the concept of four channels and frequency hopping used in the embodiment.
FIG. 8 is an explanatory diagram showing an operation sequence of the control station and the terminal station when the power is turned on in the embodiment.
FIG. 9 is an explanatory diagram showing a call control sequence up to the start of data communication or voice communication in the embodiment.
FIG. 10 is a flowchart showing a transmission control operation in the personal computer in the embodiment.
FIG. 11 is a flowchart showing a transmission control operation in a central control station in the embodiment.
FIG. 12 is a flowchart showing a data transmission operation in the embodiment.
[Explanation of symbols]
101 ... public line,
102 ... network control device,
103 ... Wireless telephone,
104 ... PC,
105 ... Printer,
106 ... Wireless LAN adapter,
107 ... LAN.

Claims (6)

In a wireless communication device that communicates using a frequency hopping method,
Setting means for setting an operation mode based on a user operation;
Switching means for generating a frequency switching timing as a reference for frequency switching of another wireless communication apparatus in accordance with the setting of the operation mode by the setting means, and switching the frequency according to the timing;
Transmitting means for wirelessly transmitting information indicating frequency switching timing at the frequency switched by the switching means;
Radio communication apparatus characterized by having a. In claim 1 ,
The wireless communication device according to claim 1, wherein the switching unit switches the frequency based on information wirelessly transmitted by another wireless communication device according to the setting by the setting unit. In claim 1 ,
When the first mode is set by the setting unit, generation of a frequency switching timing serving as a reference for frequency switching of another wireless communication device is performed,
A wireless communication apparatus comprising: a hopping pattern for communicating with another wireless communication apparatus when the first mode is set by the setting means . In claim 1 ,
When the first mode is set by the setting unit, generation of a frequency switching timing serving as a reference for frequency switching of another wireless communication device is performed,
A wireless communication apparatus, comprising: a notifying unit that notifies a hopping pattern information to a communication partner when the mode is switched to the first mode by the setting unit . In claim 1 ,
The wireless communication device, wherein the setting means sets an operation mode in response to a user operation of a switch mounted on the wireless communication device or a switch mounted on an adapter connected to the wireless communication device. In claim 1 ,
The wireless communication device, wherein the setting means sets an operation mode in response to a user operation of a wireless communication device or a display unit and a data input unit of the wireless communication device.

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