JP3347565B2 - Wireless communication apparatus and wireless communication method using frequency hopping method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a radio communication apparatus and a radio communication method using a frequency hopping method.

[0002]

2. Description of the Related Art Conventionally, in frequency-hopping wireless communication, there are a method of switching a frequency for each communication frame according to a hopping pattern and a method of switching a frequency in the middle of a communication frame.

[0003] In any of the methods, when performing communication, identification information such as a system ID or an individual ID is added before communication information to assemble and transmit a communication frame.

The receiving side analyzes the identification information of the received communication frame, and receives the subsequent communication information only when the identification information is addressed to the own apparatus.

In voice communication, real-time performance is required, so that voice information must always be transmitted. However, data communication does not always transmit data, and data is transmitted when data to be transmitted occurs. are doing.

Therefore, data communication can be performed even if another system installed nearby performs data communication with the same hopping pattern. However, the wireless communication device does not recognize that nearby systems are performing communication using the same hopping pattern or the hopping pattern in which frequencies overlap.

[0007]

However, in the above-mentioned conventional method of switching frequencies in the middle of a communication frame, identification information is not added to all frequencies to be switched, and a system installed in the vicinity is not provided. However, even if the data transmitted by the user is accidentally received, the data may be erroneously received as the data transmitted to the own device.

[0008]

According to the present invention, there is provided a wireless communication apparatus for performing communication using a frequency hopping method, in which a voice input via a voice interface and data input via a data interface are used. Wireless communication frame assembling means for assembling a wireless communication frame including a voice channel and a data channel by adding system identification information unique to the communication system to each other; and a frequency between the voice channel and the data channel included in the wireless communication frame. Communication means for switching the frequency in the middle of the wireless communication frame, and for communicating the voice and data to which the system identification information is added each time the frequency is switched in the middle of the wireless communication frame. A wireless communication device is provided.

Also, in a wireless communication method for performing communication using a frequency hopping method, a voice input via a voice interface and data input via a data interface are respectively assigned to a communication system. By adding system identification information, assembling a wireless communication frame including a voice channel and a data channel, switching a frequency between a voice channel and a data channel included in the wireless communication frame, and setting a frequency in the middle of the wireless communication frame. Wireless communication method, wherein voice and data to which the system identification information is added are communicated each time the frequency is switched in the middle of the wireless communication frame.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

(Description of Configuration of Each Unit) FIG. 1 shows a configuration diagram of a system assumed in the present embodiment.

As shown in FIG. 1, the present system comprises wireless terminals having various functions. In FIG.
101 is a public network, 102 is a network control device having a public line interface, 103 is a wireless telephone, 104 is a personal computer connected to a wireless PC card, 105 is a printer with a built-in wireless control unit, and 106 is an Ethernet interface Wireless LAN adapter, 107 is LAN
It is.

[0012] Any one of these terminals functions as a central control station. 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. Other wireless terminals (terminal stations) operate based on the timing generated by the central control station, and make a transmission request or a hopping pattern assignment request to the central control station when starting communication.

FIG. 2 shows the configuration of the wireless control unit. In the figure, 201 is a PCMCIA interface,
Data input / output interfaces such as Centronics and Ethernet; 202, a voice input / output interface such as a handset interface or a public network interface; 203, an error correction processing unit (ECC);
Denotes a CPU, 205 denotes a memory, 206 denotes a DMA controller, 207 denotes an ADPCM codec, 208 denotes a channel codec, 209 denotes a radio unit, and 210 denotes a data bus.

By changing the interface,
The same configuration of wireless control unit can be used for various types of terminals.

FIG. 3 shows an internal configuration diagram of the channel codec 208. In the figure, 301 is a CPU data bus, 302 is ADPCM encoded audio data, 30
3 is a CPU bus interface, 304 is an ADPCM
An interface, 305 a mode register for setting an operation mode, 306 a hopping pattern register capable of storing a plurality of hopping patterns, 307 a frame number / next frequency number (BF / NF) register, and 308 a system ID for storing a system ID Register, 309
Is an intermittent activation terminal address register, 310 is an LCCH (logical control channel) register for storing control data exchanged between wireless terminals, 311 is a FIFO buffer, 3
Reference numeral 12 denotes a timing generator for controlling transmission / reception timing of a radio line frame, 313 denotes a CNT channel assembler / disassembler for exchanging system control information, 314 denotes an LCCH (logical control channel) assembler / disassembler, and 315 denotes data assembling. / Disassembly section, 316 is a voice assembly / disassembly section, 31
7 is a frame synchronization unit, 318 is a unique word detection unit,
319 is a CRC encoding / decoding unit, 320 is a bit synchronization unit, 321 is a radio control unit, 322 is an intermittent reception control unit, 3
23 is a scrambler / descrambler, 324 is an AD converter, 325 is a reception level detection unit, 326 is an interrupt signal, 327 is a radio unit, and 328 is an address register for storing a destination address.

FIG. 4 shows the configuration of the radio unit. In the figure, 401a and 401b are transmitting / receiving antennas, 402 is a switch for switching the antenna 401, and 403 is a band pass filter (hereinafter referred to as B) for removing signals in unnecessary bands.
PF), 404 are transmission / reception changeover switches, 405 is a reception system amplifier, 406 is a transmission system amplifier (with power control), and 407 is 1st. Intermediate frequency (1st.
IF) down converter, 408 is an up converter, 409 is a transmission / reception changeover switch, 410 is a BPF for removing unnecessary band signals from the signal converted by the down converter 407, and 411 is 2n.
d. This is a down converter for the intermediate frequency (2nd.IF), and a reception form of the double conversion system is constituted by 407 and 411.

412 is 2nd. BPF for IF, 413
Is a 90 ° phase shifter and 414 is a quadrature detector.
Detection and demodulation of the received signal are performed by 2, 413. Reference numeral 415 is a waveform shaping comparator, 416 is a reception-type voltage controlled oscillator (hereinafter, VCO), 417 is a low-pass filter (hereinafter, LPF), and 418 is a PLL including a programmable counter, a prescaler, a phase comparator, and the like. (Phase-Locked Loop
In p), 416, 417, and 418 form a frequency synthesizer of the receiving system.

Reference numeral 419 denotes a VCO for generating a carrier signal,
Reference numeral 20 denotes an LPF, and reference numeral 421 denotes a PLL including a programmable counter, a prescaler, a phase comparator, and the like.
9, 420 and 421 constitute a frequency synthesizer for hopping. Reference numeral 422 denotes a transmission VCO having a modulation function, 423 denotes an LPF, 424 denotes a P composed of a programmable counter, a prescaler, a phase comparator, and the like.
The LLs 422, 423, and 424 form a transmission frequency synthesizer having a frequency modulation function. 4
Reference numeral 25 denotes a reference clock for various PLLs 418, 421, and 424, and reference numeral 426 denotes a band-limiting filter for transmission data (baseband signal).

FIG. 5 shows a radio frame used in the present system. One frame has a length of 6250 bits (10 ms), a CNT (system control) channel, an LCCH
(Logical control channel) channel, audio data channel 2
It comprises a total of five time-division multiplexed channels including data channels and a frequency switching section (CF field).

The CNT channel is connected to the carrier sense section (C
S), a preamble section (PR), and a frame synchronization word section (SY) for the receiving terminal to maintain frame synchronization.
N), a system ID part (ID) for receiving only data from the central control station belonging to the same system, a frame number information part (B used for hopping pattern control)
F), an intermittent terminal activation address section (WA) for activating the terminal during intermittent reception, and a next frame frequency section (N for updating the hopping pattern register 308).
F), a reserve section (Rev), a CRC section (CRC), and a guard time (GT).

The voice channel is a carrier sense section (C
S), preamble part (PR), unique word part (U
W), system ID section (ID), audio data section (R /
R), a CRC section (CRC), and a guard time (GT).

The data channel is a carrier sense section (CS
0, CS1, CS2), a preamble part (PR), a unique word part (UW), a system ID part (ID), a destination address part (DA), and a data part (Data).

In the present embodiment, the CVT channel and the LCCH channel define the first hopping pattern as 2
The audio data channel uses the second hopping pattern and the data channel uses the third hopping pattern.

The system ID section (I
By providing D), it is possible to prevent erroneous reception of data transmitted by another system.

FIG. 6 is a conceptual diagram of frequency hopping used in the present system.

In the system of the present embodiment, 26 MHz
, And 26 frequency channels of 1 MHz width are used. Considering the case where there are frequencies that cannot be used due to interference noise or the like, 20 frequency channels are selected from the 26 channels, and frequency hopping is performed on the selected frequency channels in a predetermined order.

In this system, one frame is 10 ms.
And hops the frequency channel every frame. Therefore, one of the hopping patterns
The length of the period is 200 ms.

In the figure, 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.

In this system, as shown in FIG. 7, the first hopping pattern (HP1) in the CNT channel and the LCCH channel, the second hopping pattern (HP2) in the voice channel, and the third hopping pattern in the data channel. Using the pattern (HP3), control is performed so that each channel does not use the same frequency at the same time. This makes it possible to transmit and receive data to and from a different communication partner for each channel.

In order to reduce the number of hopping patterns held in the channel codec, the hopping patterns used for each channel are generated by time-shifting a pattern in which the frequencies are arranged in the same order.

FIG. 8 shows the concept of four channels and frequency hopping used in the present system. The figure shows how the control channel, voice channel, and data channel hop independently.

The basic operation of the radio control unit will be described below with reference to FIGS.

(Transmission Data Type) Data to be transmitted is roughly classified into three types.

First, there is 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 LCCH register 310 in the channel codec 208 via the CPU data bus.

The second is real-time data such as voice. This data is sent to the audio input / output interface 202
Analog voice is input from ADPCM codec 2
The digital code is converted into a digital code by 07 and is taken into the channel codec 208 at a predetermined timing.

The third is non-real-time data sent from the memory 205 or the like of the personal computer. This data is input from the data input / output interface 201,
The data is stored in the memory 205 by the 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.

When these data are received, the flow is completely reversed.

(Description of Operation of Channel Codec) The channel codec 208 has a function of assembling data into a frame format shown in FIG. Hereinafter, the operation of the channel codec 208 will be described.

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 described in the system of FIG. The central control station transmits a frame according to this timing, and the terminal station that has received the frame maintains frame synchronization according to a frame synchronization word.

Next, data sent from the central control station via the CNT channel is stored in a register inside the channel codec 208. An HP (hopping pattern) register 306 and an ID
Register 308, WA (starting terminal address) register 3
In the central control station, the CPU writes necessary values to these registers. Further, in synchronization with the operation timing, the frame number / next frame frequency number (BF / N
F) The value inside the register 307 is updated. The frequency number written in the NF register is the 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 data of the CNT channel, and the CNT assembling unit 312 assembles the data to transmit.

On the other hand, when the terminal station receives the CNT channel, it decomposes in the CNT assembling / decomposing unit 312,
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 that subsequent data is received. If the received WA matches the value of the WA register 307 of the own station during the intermittent reception, an activation request interrupt is generated. Furthermore, the table of the hopping pattern register 308 is rewritten using the received BF and NF information data.

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

In the LCCH channel, the CP of the transmitting terminal is
The data stored in the LCCH register 310 inside the channel codec 208 and the data in the ID register
Assembled by the CCH assembling / disassembling unit 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, and the LCCH register 310 is used only when the received system ID matches the value written in the ID register 306 of the own station.
Interrupt is generated for the CPU after being stored in
Read by CPU.

In the audio channel, the data input via the ADPCM interface 304 and the ID register 3
08 is assembled by the voice assembling / disassembling unit and transmitted at a predetermined timing. Conversely, the received voice data is decomposed at a predetermined timing by the voice assembling / decomposing unit, and only when the received system ID matches the value written in the ID register 306 of the own station, the ADPCM codec via the ADPCM interface 304. Output at the timing of 207.

In the data channel, data is transmitted only when the CPU makes a data transmission request. If a data transmission request has been made, the channel codec 208
The PU bus interface 303 transmits a DMA (Direct Memory Acc) at a timing of one byte.
ess) request to the DMA controller (DMA
C) Output to 206. DMAC2 for DMA request
When the data is written in response to the data 06, the data assembling / disassembling unit converts the data into serial data and stores the data in the ID register 308.
It is assembled together with the data inside and transmitted at a predetermined timing. Conversely, when data is received, it is disassembled by the data assembling / disassembling unit, and is converted into data parallel only when the received system ID matches the value written in the ID register 306 of its own station. DMA request to D
The data is output to the MAC 206, and the DMA controller 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, and the CPU that has received the interrupt performs processing such as securing a memory for receiving the next frame.

When transmitting data through all the above channels, a CRC code generation unit 318 generates a CRC code,
It is stored in the RC field and transmitted. CRC on the receiving side
A check can be performed to detect the occurrence of an error.
All the transmission data other than the frame synchronization word and the unique word are scrambled by the scrambler 322. This is to reduce the imbalance of the data sent to the radio unit and to facilitate the extraction of the synchronous clock.

Conversely, when data is received, when a frame synchronization word or a unique word is detected, descrambling is performed by the descrambler 322 at that timing.
At the same time as performing the CRC check, data is input to the decomposing unit of each field.

(Explanation of Operation Example) As described above, in this system, control is performed by assembling a frame composed of a plurality of channels for communication between terminals and switching the frequency to be used at regular intervals. I have.

Hereinafter, the specific operation of the present system will be described in the case of voice communication via a network control device using a handset connected to a personal computer, and the personal computer will perform file transfer with other personal computers. The case and the case where voice communication and data communication are performed simultaneously will be described below. In the present embodiment, description will be given on the assumption that the network control device connected to the public line functions as a central control station.

FIG. 9 shows the operation sequence of the control station and terminal station when the power is turned on in this system, FIG. 10 shows the call control sequence until the start of data communication or voice communication, and FIG.
1 is a flowchart of a voice communication control operation in a personal computer, FIG. 12 is a flowchart of an operation at the start of voice communication, FIG. 13 is a flowchart of a data communication control operation in a personal computer, FIG. 14 is a flowchart of a data communication operation in a personal computer, and FIG. FIG. 16 is a conceptual diagram of a time division channel and frequency hopping at the time of data communication, and FIG. 16 is a conceptual diagram of a time division channel and frequency hopping at the time of data communication.

Hereinafter, description will be made with reference to these figures.

<< Sequence of Control Station and Terminal at Power-Up >> In FIG. 9, when the power is turned on and the terminal is initialized in S901, the terminal is controlled by the control station according to the set value of the external switch. Or a terminal station, and when recognizing that it is a control station, determines a first hopping pattern for a control channel, assembles a synchronization signal, hopping pattern information, own system ID, and the like into a frame, Output is performed as a CNT frame at each predetermined timing.

Similarly, if the terminal itself is recognized as a terminal station by the set value of the external switch after the terminal is started, the address of the terminal itself and the system ID of the control station to be received are stored. When the processing is completed, C
Wait for an NT frame at any frequency. CN from control station
When a T frame is received, a frequency hopping in the next unit time is acquired based on the NF in the frame. The terminal station changes the reception frequency based on the received frequency and waits for the next CNT frame. The terminal station repeats this process, recognizes the hopping pattern used by the control station, and stores this in the HP register 306 in the channel codec 208.

Upon completion of storing the hopping pattern 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 step S902. 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 section and transmitted.
The control station receives the LCCH frame and receives the data in the data section if the DA in the LCCH frame has a global address.
If there is a terminal station address and registration request signal,
Based on the information, the terminal station address is stored and newly registered.

When the registration is completed, in S903, the control station sends the address of the control station to the newly registered terminal station in the LC.
The notification is made using the CH frame. When the terminal station receives the address of the control station from the LCCH frame, the terminal station stores the address of the control station, and after the processing is completed, notifies the control station of the start-up completion using the LCCH frame in S904. When the control station receives the start-up completion notification from the terminal station, the process shifts to a normal process.

After the terminal station outputs the start-up completion notification,
At 905, transmission from the terminal station is enabled.

Next, in FIG. 11, the terminal station determines whether there is a voice communication request (S1101). When there is a voice communication request, the voice communication application program of the personal computer is started. 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 partner terminal) to the wireless control unit via the data input / output interface unit (S1102).

Next, the radio control unit enters a calling procedure. The transmission request command is written as LCCH data in the LCCH register 309 in the channel codec 208 (S1103), and the address of the central control station is written in the address register 328 (S1104).
The transmission mode is set (S1105). At the time of LCCH transmission, a carrier is detected in the carrier sense field in the channel codec 208 (S1106). If a carrier is detected during this time, the other terminals may receive the LCC
Since it is considered that the H channel is used, contention control for stopping data transmission until the next frame is performed (S1107). If no carrier is detected, it is considered that no other terminal is using the LCCH channel, so that the LCCH register 309 and the address register 32
8. The data of the ID register 308 is read to assemble the frame of the logical control channel (S1108), and the transmission of the data to the central control station is started (S1109). still,
The hopping pattern used for transmitting the LCCH data uses the first hopping pattern as in the case of the CNT channel.

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 notification command is sent to the personal computer that has made the call request using the LCCH. In addition, a notification of a hopping pattern (second hopping pattern) number and a notification of which of the two audio channels to use as a transmission side when exchanging audio data between the personal computer and the central control station will be given. Do.

When the personal computer receives the LCCH channel with the first hopping pattern (S1110), the received LCCH channel is decomposed by the LCCH assembling / disassembling unit 314 in the channel codec 208 (S1111).
The system ID transmitted in the system ID section is compared with the system ID in the ID register in the channel codec, and it is determined whether the address transmitted in the destination address section is that of the own terminal. (S1112). As a result, if the system IDs match and the address is that of the own terminal (S1113), the subsequent data is received. That is, an incoming call notification, a hopping pattern, and a channel to be used are allocated (S11).
14).

The personal computer having received the incoming call notification, the hopping pattern, and the channel to be used, sets the second hopping pattern to be used in the voice communication channel and the channel to be used in the HP register 306 of the channel codec 208, and executes the ADPCM. The operation of the codec is started (S1115).

To start a call, the mode register 305 of the channel codec 208 is set to the voice mode (S1201 in FIG. 12), and the transmission slot number is set (S1202) to set the operation of the ADPCM codec (S1203). I do.

Then, a voice call is started (S1204), and it is determined in S1301 of FIG. 13 whether there is a request for data communication.

According to the above procedure, a link between the personal computer, the network control device, and the partner terminal is established, and a call between the personal computer and the partner terminal is started.

During voice communication, voice input from the handset of the personal computer is encoded by the ADPCM codec 207, and the encoded data is input to the channel codec 208, and the preamble, unique word, and system ID are transmitted every 160 bits. After the addition, scrambling is performed and transmission is performed at a predetermined voice channel position.

On the other hand, at the time of reception, bit synchronization is established in the preamble section of the data received on the voice channel, a unique word is detected, and when the system ID matches the system ID in the ID register 308, descrambling is performed. The descrambled data is ADPCM
The data is decoded by the codec 207 and output as voice from the speaker of the handset.

At this time, the frequency of the control channel is switched in the first hopping pattern to F1, F2, F3, F4,... As shown in FIG.
Since the frequency is switched to 4, F5, F6,..., The frequency switching during voice communication is performed as shown in FIG.
It becomes as shown in.

That is, the frequency switching at the time of voice communication is performed at F
1, F3, F2, F4, F3, F5,.

Next, if a request for voice communication is not made in S1101 and a data communication request is made to the terminal station in S1301 of FIG. 13 (S1301), the data communication application program of the personal computer is started and installed in the personal computer. The wireless unit driver 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 (S1302).

Next, the radio control unit enters a transmission procedure as in the case of voice communication, writes a transmission request command as LCCH data in the LCCH register 309 in the channel codec 208 (S1303), and stores the command in the address register 328 in the central control station. Is written (S1304), and the mode register 305 of the channel codec 208 is set to the LCCH transmission mode (S13).
05). At the time of LCCH transmission, channel codec 2
In 08, carrier detection is performed in the carrier sensing field (S1306). 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 (S1307). If no carrier is detected, it is considered that no other terminal is using the LCCH channel. Therefore, the data of the LCCH register 309, the address register 328, and the ID register 308 are read to assemble a frame of the LCCH channel (S1).
308), and starts sending data to the central control station (S).
1309).

The central control station receiving the transmission request command
Similarly, an incoming call is notified to the partner terminal using the LCCH, and when a response is returned from the partner terminal, call setting is performed by transmitting a hopping pattern (third hopping pattern) number for data transmission / reception to the two terminals.

When the personal computer receives the LCCH channel in the first hopping pattern (S1310), the received LCCH channel is decomposed by the LCCH assembling / disassembling unit 314 in the channel codec 208 (S1311).
The system ID transmitted in the system ID section is compared with the system ID in the ID register in the channel codec, and it is determined whether the address transmitted in the destination address section is that of the own terminal. (S1312). As a result, if the system IDs match and the address is that of the terminal itself (S1313), subsequent data is received. That is, an incoming call notification and hopping pattern assignment are received (S1314).

When the two terminals obtain the third hopping pattern for data transmission / reception according to the above procedure, they set the third hopping pattern to be used in the HP register in the channel codec 208 (S1315). Transmit and receive data while switching the frequency according to the given hopping pattern (S1).
316). In other words, the wireless control unit driver reads the memory 2 in the wireless control unit from the memory 205 in the personal computer.
05 is transferred (S1401).

In the radio control unit, the data stored in the memory 205 is error-correction-coded, and
(S1402). Thereafter, the channel codec 20 is transmitted from the memory 205 to the DMA controller.
8 and the DMA transfer address (S14).
03), mode register 3 of channel codec 208
In step S1404, a transmission request is set to the request. The channel codec 208 that has received the transmission request detects a carrier (S1405), and waits for one frame when a carrier is detected (S1406). If no carrier is detected, a DMA request is generated in units of 1 byte in accordance with the timing of the data channel. Upon receiving the DMA request, the DMA controller transfers the data in the memory 205 to the channel codec 208 (S14).
07), the channel codec 208 adds a preamble, a unique word, and a system ID in the ID register 308, and scrambles the transmission (S1).
409).

When transmission of one packet is completed, the CPU
(S1410). If there is more data to be transmitted, the process returns to S1403 and performs transmission again (S1411).

If there is no data to be transmitted, it is checked whether there is a request for voice communication (S1412). At this time, if voice communication has already been performed, no new voice communication request is made, but only data communication is performed. If voice communication is requested, the process proceeds to S1101 in FIG. 12 described above.

If no voice communication request is made in S1412, the mode register 305 of the channel codec 208 is set to the reception mode and the reception is waited (S1413).

In the receiving side radio control unit, D
The MA controller is set to the transfer mode from the channel codec 208 to the memory 205.

When the data is received (S 1414), in the channel codec 208, the data assembling / disassembling unit performs disassembly (S 1415), establishes bit synchronization in the preamble section, detects a unique word, and sets the system ID unit. Is compared with the system ID in the ID register 308 (S1416). As a result, if the system IDs match (S1417), descrambling is performed.

Then, in the data section, a DMA request is generated in byte units. Upon receiving the DMA request, the DMA controller
Is transferred to the memory 205 (S1418).
When the transfer of one packet of data is completed, a reception completion interrupt is generated from the channel codec 208 and the CPU
Performs error correction decoding processing of the data stored in the memory 205, becomes final reception data, and transfers the data to the personal computer (S419).

Data can be transmitted according to the above procedure. If there is data to be transmitted, the same procedure is repeated to transmit an unlimited amount of data.

The switching of the frequency of the control channel during data communication as described above becomes F1, F2, F3, F4,... As shown in FIG. , F6, F7, F8, ...
・ ・

That is, switching of the frequency for data communication only (no voice communication) is performed by switching between F1 and F1 as shown in FIG.
5, F2, F6, F3, F7,...

Next, when a data communication request is made while voice communication is being performed in FIGS. 11 and 12, or when a data communication request is made in FIGS. 13 and 14,
A description will be given of a case where a personal computer performs file transfer with another personal computer while performing voice communication via a network control device using a handset connected to the personal computer.

The hopping patterns of the voice communication and the data communication are individually determined in the same manner as described above for the voice communication and the data communication. That is, both communications are performed with completely different hopping patterns. Then, the personal computer performing the voice communication and the data communication at the same time stores the first hopping pattern for the control channel, the second hopping pattern for the voice channel, and the third hopping pattern for the data channel in the HP register 306 in the channel codec 208. Each hopping pattern is stored.

Radio section 209 has channel codec 208
The communication is performed by switching the frequency in accordance with the three hopping patterns stored in the HP register 306 in FIG.

The system ID in the ID register 308 is added to each channel transmitted at the switched frequency, and the transmission is performed. On the receiving side, the received system ID matches the system ID in the ID register 308. Receive data only when you do.

That is, as shown in FIG. 7, the hopping pattern of the control channel (F1, F2, F3, F4,...)
And the hopping pattern (F3, F4,
F5, F6,...) And the hopping pattern of the data channel (F5, F6, F7, F8,...), And F1, F3, F5, F2, F2 as shown in FIG.
The frequency is switched to 4, F6, F3, F5, F7,...

In the above description, the case where the wireless terminal has performed a calling operation has been described, but the case where there is an incoming call will be described below.

FIG. 17 is an operation flowchart of the control station when there is an incoming call from the public network to the network control station. FIG. 18 is an operation flowchart of the wireless terminal when there is an incoming call from the public network to the control station.

In FIG. 17, when there is an incoming call from the public network to the network control station (S1701), the control station writes the incoming call command in the LCCH register 309 in the channel codec 208, and stores the address of the destination wireless terminal in the address register 328. After writing, set the mode register 305 of the channel codec 208 to the LCCH transmission mode,
The incoming command in the LCCH register 309, the destination wireless terminal address in the address register 328, and the system ID in the ID register 308 are read, the LCCH channel is assembled (S1702), and the LCCH channel is transmitted to the destination wireless terminal. Is notified that there is an incoming call (S1703). The hopping pattern used for transmitting the LCCH data uses the first hopping pattern as in the case of the CNT channel.

The wireless terminal (in the present embodiment, a personal computer) that has received the LCCH channel is (S180)
1) The LCCH channel is decomposed by the LCCH assembling / decomposing unit 314 in the channel codec 208 (S180).
2), system ID of system ID section and ID register 3
The system ID is compared with the system ID in 08 (S1803). As a result, if the system IDs match (S1804), the subsequent data is received, and an incoming call process such as ringing is performed to notify the operator that there is an incoming call (S180).
1805). Thereafter, when the operator responds to the incoming call (S1806), an incoming response command is written to the LCCH register 309 in the channel codec 208 to notify the control station that the incoming call has been answered (S1807), and the address After writing the address of the central control station in the register 328 (S1808),
Set the mode register 305 of the channel codec 208 to L
The mode is set to the CCH transmission mode (S1809). And
The response to the incoming call is made to the central control station by reading the incoming call response command in the LCCH register 309, the address in the address register 328, and the system ID in the ID register 308 to assemble the LCCH channel (S1810) and transmitting it. Is notified (S181).
1).

Upon receiving the LCCH channel (S 1704), the central control station
The LCCH channel is disassembled by the CH assembling / disassembling section 314 (S1705), and the system ID and ID of the system ID section are disassembled.
The system IDs in the register 308 are compared (S170
6), as a result of the comparison, when the system IDs match (S17)
07), receiving an incoming response command by receiving the subsequent data (S1708), and transmitting the data to the responding personal computer to the public line, or hopping for exchanging data received from the public line between the central control station and the personal computer. In order to notify the pattern, an LCCH channel added with a system ID and the like is assembled again (S1709),
The data is transmitted to the personal computer (S1710).

At this time, for an incoming call from the public line, all data is regarded as voice data, and the hopping pattern notified to the personal computer is also the second hopping pattern for the voice channel. This is because all data sent from the public line is modulated as voice data, so that even facsimile or personal computer data can be handled as voice data.

When the notification of the hopping pattern to be used is completed, the central control station shifts to the voice communication phase in the same manner as at the time of calling (S1711).

If no incoming response command is received from the personal computer in S1708, the personal computer determines that communication is not possible and notifies the public line that it is busy (S1712).

When the personal computer that has notified the central control station of the incoming call response in S1811 receives the LCCH channel thereafter (S1812), the PC in the channel codec 208
The LCCH channel is disassembled by the CCH assembling / disassembling section 314 (S1813), and the system ID and ID of the system ID section are
The system ID is compared with the system ID in the register 308 (S181).
4) When the system IDs match (S1815), the subsequent data is received.

When the hopping pattern to be used is assigned by the central control station according to the received data (S181).
6), HP register 306 of channel codec 208
Then, the second hopping pattern used in the voice communication channel and the channel to be used are set, the operation of the ADPCM codec is started (S1817), and the process shifts to the voice communication phase similar to that at the time of calling (S1818).

If no hopping pattern is assigned in S1816, an incoming response command is transmitted to the central control station again.

Note that if the personal computer makes a data communication transmission request while communication for an incoming call from the public line is being performed, the above-described data communication transmission control phase is performed. Even if the personal computer has already performed data communication, the above-described incoming call control phase can be performed if there is an incoming call.

As described above, according to the present embodiment, system IDs are added to all control channels, voice channels, and data channels that communicate at different frequencies, so that even if other systems use the same frequency, Data is not erroneously received even during communication.

[0102]

As described above, according to the present invention, the voice channel and the data channel included in one radio communication frame are communicated at different frequencies, so that the probability that both voice and data are simultaneously erroneous is reduced. Can be
Furthermore, even if the frequency is switched in the middle of the wireless communication frame, since the system identification information is added to each of the voice channel and the data channel, it is possible to prevent the data from being erroneously received from another system. it can.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an embodiment.

FIG. 2 is a configuration diagram of a wireless control unit according to the embodiment;

FIG. 3 is a configuration diagram of a channel codec according to the embodiment;

FIG. 4 is a block diagram of a wireless unit according to the embodiment;

FIG. 5 is a configuration diagram of a wireless frame according to the embodiment;

FIG. 6 is a conceptual diagram of a frequency hopping method according to the embodiment.

FIG. 7 is an example of a hopping pattern according to the embodiment;

FIG. 8 is a conceptual diagram of a time division channel and frequency hopping according to the embodiment.

FIG. 9 is a power-on sequence between a control station and a terminal station according to the embodiment;

FIG. 10 is a call control sequence up to the start of transmission according to the embodiment.

FIG. 11 is a flowchart of a voice communication control operation according to the embodiment;

FIG. 12 is a flowchart of voice communication control according to the embodiment;

FIG. 13 is a flowchart of a data communication control operation according to the embodiment;

FIG. 14 is a flowchart of a data communication operation according to the embodiment;

FIG. 15 is a conceptual diagram of time-division channels and frequency hopping during voice communication according to the embodiment.

FIG. 16 is a conceptual diagram of time division channels and frequency hopping during data communication according to the embodiment.

FIG. 17 is a flowchart of an incoming call control operation of the control station according to the embodiment;

FIG. 18 is an incoming call control operation flowchart of the wireless terminal according to the embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Public network 102 Network control device 103 Wireless telephone 104 Personal computer 105 Printer 106 Wireless LAN adapter 107 LAN

Claims (2)

(57) [Claims] 1. A wireless communication apparatus for performing communication using a frequency hopping method, comprising: a system identification unique to a communication system for each of voice input via a voice interface and data input via a data interface. Add information,
Wireless communication frame assembling means for assembling a wireless communication frame including a voice channel and a data channel; and switching a frequency between a voice channel and a data channel included in the wireless communication frame, and switching a frequency in the middle of the wireless communication frame. Communication means for communicating voice and data to which the system identification information is added each time a frequency is switched in the middle of the wireless communication frame. 2. A wireless communication method for performing communication using a frequency hopping method, wherein a voice input via a voice interface and a data input via a data interface are respectively assigned to a communication system. Add system identification information,
Assembling a wireless communication frame including a voice channel and a data channel, switching a frequency between a voice channel and a data channel included in the wireless communication frame, switching a frequency in the middle of the wireless communication frame, A wireless communication method, characterized in that voice and data to which the system identification information is added are communicated every time the frequency is switched in the middle.