JP3761973B2 - Wireless communication system, control device, and wireless communication device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present inventionWireless communication system, control device, and wireless communication deviceAbout.
[0002]
[Prior art]
Conventionally, in a centralized control type digital wireless communication system including a centralized control station and a terminal station, the control channel is transferred from the centralized control station to the terminal station, such as a logical control channel of a digital cordless system. The downlink control channel and the uplink control channel from the terminal station to the centralized control station are separated.
[0003]
[Problems to be solved by the invention]
However, in the above conventional example, the control channel is fixedly divided into a downlink control channel and an uplink control channel in terms of radio frame configuration and control. For example, it is desired to use only a lot of downlink control channels. In this case, there is a drawback that the portion allocated to the uplink control channel cannot be used effectively.
[0004]
Also, if the radio frame configuration is divided into a downlink control channel from the central control station to the terminal station and an uplink control channel from the terminal station to the central control station, a hardware configuration for transmitting and receiving the control channel Alternatively, the control software is different between the central control station and the terminal station, and there is a disadvantage that development and production costs are increased and development and production efficiency are reduced as compared with the case where the control software can be shared.
[0005]
An object of the present invention is to provide a wireless communication system capable of flexible, efficient and effective use of a control channel, reducing development and production costs, and improving development and production efficiency.
[0006]
[Means for Solving the Problems]
  The present invention provides a wireless communication system having a communication device and a control device for controlling communication of the communication device, wherein a first control channel of a plurality of control channels on a radio frame is communicated from the control device. A wireless communication system is provided that is used as a downlink control channel dedicated to a device, and the second control channel is used in a competitive manner between the control device and the communication device.
[0007]
  In addition, in a control device that controls communication of another radio communication device, a dedicated downlink control from the control device to the other communication device is used as the first control channel among a plurality of control channels on the radio frame. There is provided a control device that is used as a channel and the second control channel is used in a competitive manner between the control device and the communication device.
[0008]
  In addition, in a wireless communication device that performs communication under control of a control device, a first control channel among a plurality of control channels on a wireless frame is used as a dedicated downlink control channel from the control device to the other communication device. A wireless communication device is provided in which the second control channel is used in a competitive manner between the control device and the communication device.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is an explanatory diagram showing a configuration of a wireless communication system in the first embodiment of the present invention.
[0020]
This system includes a plurality of wireless terminal devices 101 that wirelessly transmit voice communication data, packet communication data, and control data. In this embodiment, it is assumed that one of these wireless terminal devices is a central control station, and the other wireless terminal device is a wireless terminal station.
[0021]
In this embodiment, each wireless terminal device includes a wireless personal computer (hereinafter referred to as a personal computer) that wirelessly transmits voice communication data, packet communication data, and control data, with a headset for voice communication. Although a terminal connected to an adapter is assumed, the wireless terminal device is not limited to a personal computer, but is a line terminator, telephone, switch, printer, copier, video conference terminal, facsimile, LAN bridge, other electronic camera, video A wireless terminal device to which a wireless communication function is added can be applied to various terminals that perform data processing, such as cameras and scanners.
[0022]
The detailed configuration and operation of this embodiment will be described below.
(Configuration of wireless adapter)
FIG. 2 is a block diagram showing the configuration of the wireless terminal device 101 constituting this system, and particularly shows the internal configuration of the wireless adapter.
[0023]
In the figure, a data terminal 201 is a data terminal represented by a personal computer, for example, connected to a wireless adapter 202 via a communication cable or an internal bus. The data terminal is not limited to a personal computer as described above, but may be a workstation, a printer, a facsimile, or other data terminal equipment.
[0024]
In addition, a voice input / output headset 212 is connected to the wireless adapter 202 via a communication cable or an internal bus. Note that a handset may be used instead of the headset 212, or a hands-free type may be used by incorporating a microphone and a speaker in the wireless adapter 202 itself.
[0025]
Hereinafter, the internal configuration of the wireless adapter 202 will be described.
[0026]
The wireless unit 203 of the wireless adapter 202 performs frequency hopping SS wireless communication with a wireless unit of another wireless adapter.
[0027]
The main control unit 204 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 202.
[0028]
The memory 205 includes a ROM for storing a program used by the main control unit 204, a RAM used as a buffer area for various processes, and the like.
[0029]
The communication i / f unit 206 is a communication i / f provided as a standard in the data terminal 201 described above, for example, a communication i / f such as RS232C, Centronics, LAN, a personal computer, an internal bus of a workstation, such as an ISA bus, PCMCIAi / f etc. correspond.
[0030]
The terminal control unit 207 performs various types of communication control necessary for data communication between the data terminal 201 and the wireless adapter 202 via the communication i / f unit 206.
[0031]
The channel codec 208 performs frame processing and radio control, and data assembled by the channel codec 208 is transmitted to other radio terminal apparatuses via the radio unit 203.
[0032]
The error correction processing unit 209 is used to reduce bit errors that occur in data by wireless communication. At the time of transmission, an error correction code is inserted into the communication data to make the data redundant, and at the time of reception, an error position and an error pattern are calculated by arithmetic processing, thereby correcting a bit error generated in the received data.
[0033]
The timer 210 provides timing information used by each block inside the wireless adapter. The audio communication circuit 211 adjusts the level of the audio input / output signal from the headset 212 and converts it into a digital signal, and inputs / outputs it to / from the channel codec 208 for transmission on a radio frame.
(Configuration of radio unit)
FIG. 3 is a block diagram showing a configuration of the wireless unit 203.
[0034]
The transmitting / receiving antennas 301a and 301b are for efficiently transmitting and receiving radio signals, and the changeover switch 302 is for switching the antennas 301a and 301b. A band pass filter (hereinafter referred to as BPF) 303 is for removing signals in unnecessary bands, and a changeover switch 304 is for switching between transmission and reception.
[0035]
The amplifier 305 is a receiving amplifier, and the amplifier 306 is a transmitting amplifier with power control. The converter 307 is 1st. The IF down converter, and the converter 308 is an up converter.
[0036]
The changeover switch 309 is for switching between transmission and reception, and the BPF 310 is for removing a signal in an unnecessary band from the signal converted by the downconverter 307. Converter 311 has 2nd. This is a down converter for IF, and the two down converters 307 and 311 constitute a double-conversion reception form.
[0037]
The BPF 312 is 2nd. The 90-degree phase shifter 313 is for IF and shifts the output phase of the BPF 312 by 90 degrees. The quadrature detector 314 detects and demodulates the signal received by the BPF 312 and the 90-degree phase shifter 313. Further, the comparator 315 is for shaping the output of the quadrature detector 314.
[0038]
In addition, a voltage controlled oscillator (hereinafter referred to as VCO) 316, a low pass filter (hereinafter referred to as LPF) 317, and a PLL 318 including a programmable counter, a prescaler, a phase comparator, and the like, are used for the reception system. A frequency synthesizer is configured.
[0039]
The carrier signal generation VCO 319, the LPF 320, and the PLL 321 including a programmable counter, a prescaler, a phase comparator, and the like constitute a hopping frequency synthesizer.
[0040]
A transmission-system frequency synthesizer having a function of frequency modulation is configured by a transmission-system VCO 322 having a modulation function, an LPF 323, and a PLL 324 including a programmable counter, a prescaler, a phase comparator, and the like.
[0041]
The reference clock oscillator 325 supplies reference clocks for various PLLs 318, 321, and 324, and the baseband filter 326 is a band limiting filter for transmission data (baseband signal).
[0042]
Hereinafter, the operation of the radio unit as described above will be described.
1. When sending
Data (digital data) input from an external circuit such as a processor is band-limited by the baseband filter 326 and then input to the modulation terminal of the transmission system VCO 322.
[0043]
The transmission system VCO 322 determines the frequency based on the control voltage output from the circuits of the transmission systems PLL 324 and LPF 323, and generates an intermediate frequency (IF) modulated wave by direct modulation.
[0044]
The intermediate frequency (IF) modulated wave generated by the frequency synthesizer of the VCO 322, LPF 323, and PLL 324 is input to the up-converter 308, and added to the carrier signal generated by the frequency synthesizer including the VCO 319, LPF 320, and hopping PLL 321. Then, it is input to the transmission system amplifier 306.
[0045]
The signal amplified to a predetermined level by the transmission amplifier 306 is emitted from the antenna 301 to the space as a radio wave after the unnecessary band signal is removed by the BPF 303.
2. When receiving
The signal received by the antenna 301 is amplified to a predetermined level by the receiving amplifier 305 after a signal in an unnecessary band is removed by the BPF 303.
[0046]
The carrier signal is removed from the received signal amplified to a predetermined level by the down converter 307, and the 1st. Converted to IF frequency.
[0047]
1st. The IF reception signal is subjected to 2nd. It is input to the down converter 311 for IF.
[0048]
The down converter 311 includes a signal generated by a frequency synthesizer including a VCO 316, an LPF 317, and a reception PLL 318, and a 1st. 2nd. By the input signal from IF. A signal having an IF frequency is generated.
[0049]
2nd. The received signal down-converted to the IF frequency is input to the 90-degree phase shifter 313 and the quadrature detector 314 after the unnecessary band signal is removed by the BPF 312.
[0050]
The quadrature detector 314 performs detection and demodulation using the signal shifted in phase by the 90-degree phase shifter 313 and the original signal.
[0051]
Data demodulated by the quadrature detector 314 (analog data) is waveform-shaped as digital data by the comparator 315 and output to an external circuit.
(Configuration of channel codec)
FIG. 4 is a block diagram showing the internal configuration of the channel codec board.
[0052]
The channel codec 208 includes a CPU bus interface 403 to which the CPU data bus 401 is connected, an ADPCM interface 404 for inputting / outputting ADPCM-encoded audio data 402 between the ADPCM codec, and a mode register 405 for setting an operation mode. A hopping pattern register 408, a system ID register 406, an intermittent activation terminal address register 407, an LCCH register 409, and a FIFO buffer 410.
[0053]
In addition, a timing generation unit 411 that generates the start timing of each field in the frame, a CNT channel assembly / disassembly unit 412, an LCCH (logical control channel) assembly / disassembly unit 413, a data assembly / disassembly unit 414, an audio Assembly / disassembly unit 415, frame synchronization unit 416, unique word detection unit 417, CRC encoding / decoding unit 418, bit synchronization unit 419, radio control unit 420, intermittent reception control unit 421, scramble / Descramble 422.
[0054]
The channel codec has a function of assembling data in the frame format shown in FIG. 6 or disassembling the frame and sending the data to the input / output interface. Hereinafter, the operation of the channel codec will be described.
[0055]
The reference for the operation timing of the channel codec is generated by the timing generation unit on the central control station side. The central control station transmits frames according to this timing, and terminal stations other than the central control station hold frame synchronization according to the frame synchronization word of the received frame.
[0056]
Data sent from the central control station side through the CNT channel is determined by the CPU writing in a register inside the channel codec. The channel codec includes an HP (hopping pattern) register, an ID register, and a WA (startup terminal address) register, and the central control station writes necessary values in these registers. The channel codec reads the data in these registers at the timing of transmitting the CNT channel data, and performs transmission.
[0057]
On the other hand, when the terminal station other than the central control station receives the CNT channel, the terminal station performs processing using the received values of the respective units. Only when the received system ID matches the value written in the ID register of the own station, control is performed so as to receive subsequent data. If the WA received during intermittent reception matches the value of the WA register of the own station, an activation request interrupt is generated. Further, the hopping pattern register table is rewritten using the received BF and NF information data.
[0058]
In the LCCH channel, the data stored in the LCCH register inside the channel codec by the CPU of the transmitting terminal is assembled by the LCCH assembling / disassembling unit and sent out 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 decomposed by the LCCH assembling / disassembling unit, temporarily stored in the LCCH register inside the channel codec, then interrupted to the CPU, and read by the CPU.
[0059]
In the voice channel, data input via the voice input / output interface is assembled by the voice assembling / disassembling unit 418 and transmitted at a predetermined timing. Conversely, the received audio data is decomposed at a predetermined timing by the audio assembling / disassembling unit, and is output at the timing of the ADPCM codec via the ADPCM interface.
[0060]
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 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 converts the data into serial data and sends it at a predetermined timing.
[0061]
Conversely, when data is received, the data assembling / decomposing unit converts the data to 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.
[0062]
At the time of data transmission, a CRC code is generated as necessary, stored in a CRC part, and transmitted. 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. This is to reduce the unbalance of the data sent to the radio unit and facilitate the extraction of the synchronous clock.
[0063]
On the contrary, when data is received, when a unique word is detected, descrambling is performed at that timing, CRC check is performed, and at the same time, data is input to the decomposition unit of each field.
(Radio frame)
FIG. 5 shows a radio frame configuration used in this system.
[0064]
In the system of the present embodiment, a frequency hopping method is employed, and frequency hopping is performed every 10 ms basic frame (BF), and one multiframe is constituted by 16 BFs.
[0065]
As shown in FIG. 5, one BF is composed of CNT, LCCH, two voice channels, a data channel, and END. , Frequency hopping is performed independently. Therefore, the frequency pattern of each part of BF1 to BF16 is a hopping pattern for each part.
[0066]
FIG. 6 is an explanatory diagram showing an example of the frequency hopping method of the present embodiment. Note that. In FIG. 6, for the sake of simplicity, a case is shown in which a hopping pattern having the same voice channel and data channel portions from which hopping patterns can be independently selected is selected.
[0067]
In this system, CNT and LCCH have the same hopping pattern, and it is assumed that only one frequency can be taken in the same time (basic frame unit), CNT is transmitted by the central control station, and LCCH is wireless by competition control. One of the terminal devices transmits.
[0068]
A data channel uses one hopping pattern allocated between a pair of wireless terminal apparatuses, and there may be data channels of up to 16 frequencies at the same time. Also, the hopping pattern of the voice channel and the data channel is notified as control information of the Data portion of the control channel LCCH.
[0069]
Details of the basic frame (BF) configuration will be described below.
[0070]
In FIG. 5, a CNT (system control channel) is a control channel that is transmitted from a wireless terminal device of a centralized control station to a wireless terminal device of a terminal station, including a frame synchronization signal, a paging signal, and the like. The LCCH (Logical Control Channel) is a packet-type control channel transmitted from one wireless terminal device of a centralized control station or terminal station including logical control channel information to one or more other wireless terminal devices. .
[0071]
The voice channel is a circuit-switched data channel transmitted from one wireless terminal device to another wireless terminal device, and normally two voice channels are transmitted and received between two wireless terminal devices (one is transmitting). Used for reception and the other for reception and transmission). A data channel is a burst data channel in the form of a packet transmitted from one wireless terminal device to another wireless terminal device, and is usually one-way communication between two wireless terminal devices (one is transmitting and the other is receiving). Used for. END is the frequency switching time for the next BF.
[0072]
The components of CNT, LCCH, voice channel, data channel, and END are as follows.
[0073]
First, in the system control channel CNT, CS is a carrier sense time for 12.8 usec, PR is a 56-bit preamble for bit synchronization, and SYN is 31 bits defined by 1 dummy bit + RCR Frame synchronization signal.
[0074]
Further, ID is 63-bit calling signal defined by RCR + 1 dummy bit, BF is 8-bit basic frame number information of the next frame, and WA is a terminal to be activated among the terminals in the sleep mode System address.
[0075]
Also, NF is 8-bit frequency information of the next frame, Rev is an area number for reservation and discrimination from neighboring cells, CRC is CRC information for data from BF to Rev, and GT Is the guard time.
[0076]
Next, in the logical control channel LCCH, CS0, CS1, and CS2 are carrier sense times (priorities are given according to usage purposes), PR is a 56-bit preamble for bit synchronization, and UW is , An 8-bit unique word (for byte synchronization).
[0077]
DA is the destination system address, and Data is the contents of the logical control channel. CRC is CRC information for data from DA to Data, and CF is a guard time for frequency switching.
[0078]
Next, the voice channel is one line using two voice channels. CS is a carrier sense time, PR is a 56-bit preamble for bit synchronization, and UW is an 8-bit unique word (for byte synchronization). T / R is B-channel information of 32 kbps, CRC is CRC information for T / R data, and GT is a guard time.
[0079]
The data channel is a channel used for data transmission and is used for both transmission and reception. CF is a guard time for frequency switching, and CS0, CS1, and CS2 are carrier sense times (priorities are given according to usage purposes). PR is a 56-bit preamble for bit synchronization, and UW is an 8-bit unique word (for byte synchronization). Data is the content of the logical control channel, and GT is the guard time.
[0080]
END is a frequency switching time for the next frame, and CF is a guard time for frequency switching.
[0081]
Prior to communication channel connection, the LCCH notifies the central control station of a request for assigning a hopping pattern for voice or data communication from the terminal station, or responds to the request from the central control station to the terminal station for voice or data communication. When notifying a hopping pattern to be allocated, when notifying a request for deallocating a hopping pattern for voice or data communication allocated from the terminal station to the central control station when the communication channel is disconnected, the central control station responds to the deallocation request. When notifying the terminal station of execution of deallocation, in addition, when notifying control information between the central control station and the terminal station, and voice or between the terminal stations or between the central control station and the terminal station Used when notifying a communication channel connection request or communication channel disconnection request for data communication. .
[0082]
Which one of the two voice channels is used for transmission and reception shall be discussed with the other party in the LCCH exchanged when the communication channel is connected. Similarly, in the data channel, how to perform data transmission, such as the transmission direction and data length, shall be discussed with the other party on the LCCH exchanged when the communication channel is connected.
(Frequency hopping)
FIG. 7 is an explanatory diagram showing an example of frequency hopping in the present embodiment.
[0083]
This figure shows an example of a system having 8 frames as base frames (hereinafter referred to as BF) and using 8 frequencies from F1 to F8. Each BF indicates which frequency is used by the first HP, the second HP, and the third HP.
[0084]
Also, as shown in FIG. 7, each hopping pattern (hereinafter referred to as HP) does not use the same frequency in the same base frame (hereinafter referred to as BF), and always uses a different frequency. Further, one base frame includes one frame shown in FIG. 5, and each HP changes the frequency in a predetermined order every frame, that is, every time the base frame ends.
[0085]
Hereinafter, how to perform frequency hopping in this system will be described.
[0086]
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.
[0087]
As shown in FIG. 8, all the wireless terminals 110 other than the central control station first receive the system control channel transmitted by the central control station in BF1, so that the first HP uses the frequency F1 used in BF1. Set to the radio section. All wireless terminals 110 other than the centralized control station establish frame synchronization using the received system control channel.
[0088]
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 channel connection and communication channel disconnection to be transmitted through the logical control channel transmits control data directly to the other party using the logical control channel. Also, a terminal that does not have data to be transmitted on the logical control channel always receives control data transmitted by another terminal on the logical control channel. If the received control data is not addressed to the terminal itself, the received control data is discarded.
[0089]
The wireless terminal 110 that performs voice or data communication changes the frequency corresponding to the HP assigned in advance from the central control station in the voice channel and the data 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. 8, the first HP is assigned to the system control channel and the logical control channel, the second HP is assigned to voice communication between the terminals AB, and the third HP is assigned to data communication between the terminals AB. An assigned example is shown. In this example, the frequency is changed three times during one frame.
[0090]
FIG. 6 is an explanatory diagram showing an example of frequency hopping and transmission / reception states in a voice channel.
[0091]
Terminal A and terminal B communicate with each other on the first HP shown in FIG. 7, and terminals C and D communicate with each other on the second HP. Also, terminal A and terminal C transmit on the first voice channel, and terminal B and terminal D transmit on the second voice channel.
[0092]
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 by 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. In the case of FIG. 6, terminal A and terminal C are transmitting on the first voice channel.
[0093]
The case of BF1 will be described. When the logical control channel ends, terminal A and terminal C change the frequency according to the frequency hopping pattern assigned to each voice communication. As a result of changing the frequency, since the first HP was assigned to the terminal A and the terminal B, the frequency did not change, but the terminal C and the terminal D changed the frequency to F3. Terminal A and terminal C set the radio unit to transmit, and terminal B and terminal D set the radio unit to receive, and exchange audio data on the first audio channel.
[0094]
At the end of the first voice channel, terminal A and terminal C set the radio unit to receive, terminal B and terminal D set the radio unit to transmit, and exchange voice data on the second voice channel. At the end of the second voice channel, each terminal sets the frequency corresponding to the current base frame number in the radio unit in the frequency hopping pattern assigned to the radio unit in preparation for the next data communication. .
[0095]
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.
(Detailed operation explanation)
As described above, the system of the present embodiment is a system including a wireless terminal device in which the wireless adapter 202 and the headset 212 are connected to the personal computer 101 as shown in FIG. The device is a centralized control station and the other wireless terminal device is a terminal station, which enables simultaneous communication of voice and packet data by transmitting and receiving time-division multiplexed radio frames as shown in FIG. 5 while frequency hopping. .
[0096]
In the system of this embodiment, the CNT of the basic frame is transmitted while the centralized control station performs hopping with a predetermined hopping pattern (HP), and the LCCH is one wireless terminal device by the contention control method for each BF. Transmits according to the same HP as the CNT. The voice channel and data channel are allocated by the central control station independently of the control channel (CNT + LCCH) HP, and hop according to the HP notified by the control channel.
[0097]
The detailed operation of this embodiment will be described below.
[0098]
In the present embodiment, as described above, in the radio frame configuration of FIG. 5, the leading portion of the logical control channel (LCCH) is a carrier sense field divided into three parts, CS0, CS1, and CS2. In this embodiment, the carrier sense field is used as follows.
[0099]
CS0: When the central control station transmits LCCH data, it becomes a transmission mode and outputs a carrier, and all terminal stations always enter a reception mode and perform carrier sense.
[0100]
CS1: When a carrier station does not detect a carrier in CS0, when a terminal station transmits LCCH data having a high priority, the terminal station enters a transmission mode and outputs a carrier, and other normal priority LCCH data transmission request A certain terminal station enters a reception mode and performs carrier sense.
[0101]
CS2: Under a condition in which no carrier is detected in CS0 and CS1, when the terminal station transmits LCCH data of normal priority, it becomes a transmission mode and outputs a carrier.
[0102]
By using the divided carrier sense fields of CS0, CS1, and CS2 as described above, when there is one central control station in the system, the central control station can perform LCCH transmission without any competition.
[0103]
In addition, when the central control station does not perform LCCH transmission, the terminal station can perform high-priority LCCH transmission, but other terminal stations simultaneously perform high-priority LCCH transmission and cause LCCH transmission contention. However, there is a possibility of data collision and destruction, resulting in transmission failure. However, if the frequency of performing high-priority LCCH transmission is limited, the probability of high-priority LCCH transmission competing can be reduced.
[0104]
When the central control station does not perform LCCH transmission and the terminal station does not perform high-priority LCCH transmission, the terminal station can perform normal-priority LCCH transmission. There is a possibility that contention of LCCH transmission occurs due to LCCH transmission of the priority, data collides and is destroyed, and transmission fails.
[0105]
In the configuration of this embodiment, when the terminal station has a high priority or a normal priority LCCH transmission competes, it is impossible to directly detect the occurrence of contention in the terminal station that performed the LCCH transmission. In this embodiment, when the terminal station performs LCCH transmission to the terminal station (or the centralized control station) having the system address ADi, in order to confirm whether the LCCH transmission is successful, the terminal station having the system address ADi of the transmission destination (or When the transmission LCCH data is received in the central control station), (Ack) LCCH data indicating that the transmission is received is transmitted to the transmission source terminal station. In the transmission source terminal station, the transmission destination terminal station (Or the central control station) waits to receive an AckLCCH, and if the AckLCCH cannot be received within a predetermined time, It determines that transmission fails, to perform the LCCH retransmission.
[0106]
FIG. 9 is an explanatory diagram illustrating an example of a control channel (LCCH) transmission operation in the present embodiment. In FIG. 9, A is a central control station, and B, C, and D are terminal stations.
[0107]
In FIG. 9, in the LCCH of BF1 of the first multiframe, A, which is a central control station, transmits LCCH data from CS0 to terminal station B, and in BF2, terminal station B transmits to central control station A. On the other hand, the LCCHAck data is transmitted from CS2, the terminal station B transmits LCCH data of normal priority from CS2 to the terminal station C in BF3, and the terminal station C transmits CS2 to the terminal station B in BF4. LCCHAck data is transmitted from.
[0108]
Further, in the second multi-frame BF1 LCCH, the terminal station B transmits high priority LCCH data from CS1 to the terminal station C, and the central control station A transmits to the terminal station D in BF2. LCCHAck data is transmitted from CS0, terminal station C transmits LCCH data from CS2 to terminal station B in BF3, and no data is transmitted on LCCH in BF4.
[0109]
FIG. 10 is a flowchart showing transmission control of the control channel (LCCH) in the present embodiment. Hereinafter, the LCCH transmission operation of the terminal station will be described according to the flowchart of FIG.
[0110]
First, in S1001, when there is an LCCH transmission request, the process proceeds to S1002. In S1002, the main control unit 204 of the terminal station controls the radio unit 203 to set the reception mode at the frequency corresponding to the BF of the LCCH hopping pattern (referred to as HP1).
[0111]
In S1003, the main control unit 204 controls the radio unit 203 in CS0 to perform carrier detection. If a carrier is detected, the process proceeds to S1006. If no carrier is detected in CS0, the process proceeds to S1004. In S1004, if the LCCH transmission request is a high priority LCCH transmission request, the process proceeds to S1008, and if the LCCH transmission request is a normal LCCH transmission request, the process proceeds to S1005.
[0112]
In S1005, the main control unit 204 controls the radio unit 203 in CS1 to perform carrier detection. If a carrier is detected, the process proceeds to S1006, and if no carrier is detected in CS0, the process proceeds to S1008.
[0113]
In S1006, the number of carrier detections is set to Nc = Nc + 1, and stored in a predetermined address in the memory 205. Then, transmission is attempted on the LCCH of the next BF.
[0114]
In S1008, the main control unit 204 of the terminal station controls the radio unit 203 to set the transmission mode at the frequency corresponding to the BF of the LCCH hopping pattern (referred to as HP1). In S1009, the main control unit 204 sets the channel codec. Control is performed to assemble LCCH data with DA = DAi for the terminal station (or central control station) having the system address DAi, and the radio unit 203 is controlled to transmit the LCCH data.
[0115]
Subsequently, in S1010, the main control unit 204 controls the radio unit 203 with the next BF to set the reception mode at the frequency corresponding to the BF of the LCCH hopping pattern (referred to as HP1).
[0116]
Next, in S1011, the main control unit 204 controls the radio unit 203 to receive the LCCH data of the BF, and the received LCCH data is received from the terminal station (or the centralized control station) of the destination system address DAi. In the case of the LCCHAck data, it is determined that the transmission is successful, and the process ends. If the LCCHAck data is not the LCCHAck data from the terminal station (or central control station) of the system address DAi, the process proceeds to S1012.
[0117]
In S1012, Ack non-reception count Nnack = Nnack + 1 is set and stored at a predetermined address in the memory 205. Try. Further, when the number of Ack not received Nnack ≦ Nnack0, the process returns to S1010 and LCCH data is received by the next BF.
[0118]
As described above, in the present embodiment, the logical control channel is configured so that the downlink control channel from the central control station to the terminal station and the uplink control channel from the terminal station to the central control station depend on the hardware configuration and the frame configuration. By using multiple control channels in a multiframe in a competitive manner without distinguishing between them in a fixed manner, the control channel can be used flexibly, efficiently and effectively, and the hardware for transmitting and receiving control channels The configuration or the control software can be shared between the central control station and the terminal station, and there is a great effect that the central control station and the terminal station can be developed, production costs can be reduced, and development and production efficiency can be improved.
[0119]
In addition, the head carrier sense part of the logical control channel is divided into a plurality, the central control station starts sending the logical control channel from the head carrier sense part, and the terminal station starts sending the logical control channel from the third carrier sense part. By controlling the logical control channel transmission start position according to the type of terminal or the priority of transmission data, there is a great effect that the control channel can be used more flexibly and effectively.
[0120]
In addition, this invention is not limited to the said Example, It can change in the range which does not deviate from the summary of this invention. For example, in the above embodiment, the carrier sense unit is divided into three, and the logical control channel transmission start position (corresponding to the carrier sense unit) is controlled according to the type of wireless terminal or the priority of transmission data. The number of divisions of the carrier sense part is not limited to 3, and may be single. Furthermore, when the carrier sense part is divided, the transmission start position is controlled only by the wireless terminal type, or Alternatively, control may be performed based only on the priority of data or based on other conditions.
[0121]
Further, in this embodiment, every time one control channel is transmitted, the Ack control channel from the transmission destination is received in order to confirm the transmission success of the control channel. It is possible to confirm the transmission success by receiving the Ack control channel corresponding to the identification number from the transmission destination after assigning a number and performing control channel transmission continuously. The control method is not limited to the embodiment described above.
[0122]
Further, in the above embodiment, the configuration of the wireless terminal device in which the wireless adapter and the headset are connected to the personal computer in the above embodiment, the configuration of the wireless adapter, the wireless unit inside the wireless adapter, the configuration of the channel codec, the configuration of the basic frame, and 16 pieces The configuration of the radio frame including the configuration of the multi-frame composed of the basic frames and the control channel transmission operation sequence are not limited to the above embodiment.
[0123]
Next, a second embodiment of the present invention will be described.
[0124]
In the first embodiment described above, one control channel is provided in one radio frame, and control is performed so that the one control channel is used for contention control for each frame. This second embodiment In, a plurality of control channels are provided in one radio frame, and the plurality of control channels are controlled to be used in contention control.
[0125]
FIG. 11 is an explanatory diagram showing an example of transmission operation of the control channel (LCCH) in this embodiment. In this embodiment, three logical control channels LCCH1, LCCH2, and LCCH3 are included in one basic frame (BFi). Are multiplexed. In FIG. 11, A is a central control station, and B, C, D, E, F, and G are terminal stations.
[0126]
In the first multiframe in FIG. 11, the central control station A preferentially uses the LCCH channels of BF1 and BF2, and the other radio terminals preferentially use the other BF3 and BF4. 3 is an operation example in which contention control is performed so that the LCCH usage for each basic frame is preferentially used depending on the terminal type.
[0127]
In addition, in LCCH1, LCCH2, and LCCH3 of BF1 of the first multiframe, A, which is a central control station, transmits LCCH data to terminal stations B, C, and D, respectively, and in LCCH1, LCCH2, and LCCH3 of BF2 The central control station A transmits LCCH data to the terminal stations E, F, and G, respectively. In the LCCH1, LCCH2, and LCCH3 of the BF3, the terminal stations B, G, and E are the central control stations. The LCCHAck data is transmitted to A, and the terminal stations D, F, and C are transmitting the LCCHAck data to the centralized control station A in LCCH1, LCCH2, and LCCH3 of BF4.
[0128]
Next, in the second multiframe in FIG. 11, the central control station can use all three LCCH channels in one BF, and the terminal station can select any one of the three LCCH channels in one BF. This is an operation example in which contention control is performed by limiting the usable number of three LCCH channels in one BF according to the terminal type, such that only one LCCH channel can be used.
[0129]
As described above, by providing a plurality of control channels in one radio frame and controlling the usage of the control channel, the LCCH channel in the frame can be flexibly given priority to the centralized control station with high data transmission frequency. In addition, it can be used efficiently and effectively.
[0130]
The hardware configuration of the present embodiment is the same as that of the first embodiment, and the radio frame configuration is multiplexed with three LCCHs of the frame configuration of the first embodiment in one basic frame (BF). The preferential use of the control channel for each BF is controlled by the wireless terminal type, or the number of usable control channels in the BF is controlled by the wireless terminal type.
[0131]
As described above, in the second embodiment, the logical control channel from the central control station to the terminal station is configured so that the downlink control channel and the uplink control channel from the terminal station to the central control station depend on the hardware configuration and the frame configuration. In this way, multiple control channels in a multiframe are used in a competing manner without being fixedly differentiated, and the control channel usage is softly prioritized so that the control channel is flexible and efficient. The hardware configuration or control software for transmitting and receiving the control channel can be shared between the central control station and the terminal station, and the central control station and the terminal station can be developed and the production cost can be reduced. There is a great effect that the production efficiency can be improved.
[0132]
Also, by providing a plurality of control channels in one radio frame and controlling the plurality of control channels to be used for contention control, control channel contention is distributed, and control channels There is a great effect that the frequency of acquisition can be increased and control signals can be transmitted and received quickly.
[0133]
In addition, this invention is not limited to the said 2nd Example, It can change in the range which does not deviate from the summary of this invention. For example, in the second embodiment, the frame configuration is such that three LCCHs are multiplexed in one frame, but the number of LCCH multiplexing may be four or six, and is not limited to three. In this embodiment, priority control of LCCH for each frame is performed according to the type of wireless terminal. However, priority control of LCCH may be performed based on data priority or based on other conditions. good.
[0134]
In the second embodiment, every time one control channel is transmitted, the Ack control channel from the transmission destination is received in order to confirm the transmission success of the control channel. It is possible to confirm the success of the transmission by attaching the identification number and continuously transmitting the control channel and then receiving the Ack control channel corresponding to the identification number from the transmission destination. The reception control method is not limited to the above embodiment.
[0135]
Furthermore, in the second embodiment, the configuration of the wireless terminal device in which the wireless adapter and the headset are connected to the personal computer, the configuration of the wireless adapter, the configuration of the wireless unit inside the wireless adapter, the channel codec, the configuration of the basic frame, and the like The configuration of a radio frame including a multi-frame configuration including 16 basic frames and the control channel transmission operation sequence are not limited to the above-described embodiments.
[0136]
  As described above, according to the above-described embodiment, for example, in a spread spectrum wireless communication system composed of a centralized control station and a terminal station adopting a frequency hopping method, a part of the control channel on the radio frame is transmitted from the centralized control station to the terminal. Provided without distinguishing between the downlink control channel to the station and the uplink control channel from the terminal station to the centralized control station, and provided with means for controlling the control channel to transmit from the centralized control station and terminal station in a competitive manner ByThe control channel is not fixedly differentiated depending on the hardware configuration and frame configuration, and the control channel can be used flexibly, efficiently and effectively, and the hardware configuration or control software for transmitting and receiving the control channel The central control station and the terminal station can be used in common, and the central control station and the terminal station can be developed, production costs can be reduced, and development and production efficiency can be improved.
[0137]
  Also,By providing a plurality of control channels on a radio frame, and providing means for controlling the control channels to transmit from the central control station and terminal station in a competitive manner, the control channel contention is distributed and control is performed. There is an effect that the frequency of channel acquisition can be increased and control signals can be transmitted and received quickly.
[0138]
  Also,By having the transmission destination information in the control information transmitted on the control channel, there is an effect that the control channel can be transmitted directly to the transmission destination.
[0139]
  Also onWhether it is necessary to retransmit by confirming control channel transmission by receiving the control channel reception confirmation from the control channel transmission destination after transmitting the control channel in the control channel transmission competition method There is an effect that can be determined.
[0140]
  Also onThe control channel corresponding to the transmission control information identification information from the control channel transmission destination after the transmission of the control channel is provided in the control information transmitted on the control channel in the control channel transmission competition method By confirming the transmission of the control channel by receiving the control channel for confirmation of reception, there is an effect that it is not necessary to confirm the transmission for each control channel, and the control channel can be flexibly transmitted and received. .
[0141]
  Also,Means for selecting and deciding to which carrier sense part divided at the time of control channel transmission by dividing the carrier sense part at the head of the control channel into a plurality of parts and performing control channel transmission under a predetermined condition. By providing the control channel, it is possible to use the control channel preferentially while performing contention control, and there is an effect that the control channel can be operated more flexibly and easily.
[0142]
  Also,By providing a means for selecting and determining a wireless terminal type or a wireless terminal to be preferentially transmitted to the control channel for each of a plurality of control channels, the contention is distributed while controlling the contention, and only by software control. The control channel can be used preferentially, and there is an effect that the control channel can be operated more flexibly and easily.
[0143]
  Also,By providing means for selecting and determining the number of control channels that can be transmitted from a plurality of control channels according to the wireless terminal type or the priority of the transmission control information of the control channel, the contention is distributed while controlling the contention. The control channel can be preferentially used only by software control, and the priority can be finely changed according to the number of control channels that can be transmitted. is there.
【The invention's effect】
  As described above, according to the present invention, by providing a control channel dedicated to downlink, the control device can reliably use the control channel, so that the system can be controlled smoothly. By providing a control channel to be used in a competitive manner with the communication device, the control channel can be used flexibly, efficiently and effectively.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a configuration of a wireless communication system according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of a wireless adapter in the first embodiment.
FIG. 3 is a block diagram showing a configuration of a radio unit in the first embodiment.
FIG. 4 is a block diagram showing an internal configuration of a channel codec in the first embodiment.
FIG. 5 is an explanatory diagram showing a radio frame configuration used in the first embodiment.
FIG. 6 is an explanatory diagram showing an example of voice channel hopping and transmission / reception states in the first embodiment.
FIG. 7 is an explanatory diagram showing an example of a frequency hopping method in the first embodiment.
FIG. 8 is an explanatory diagram showing a frequency usage state in each channel in the first embodiment.
FIG. 9 is an explanatory diagram showing an example of a control channel (LCCH) transmission operation in the first embodiment.
FIG. 10 is a flowchart showing an example of control channel (LCCH) transmission operation in the first embodiment.
FIG. 11 is an explanatory diagram showing an example of a control channel (LCCH) transmission operation in the second embodiment of the present invention;
[Explanation of symbols]
101 ... Wireless terminal device,
201 ... data terminal,
202 ... wireless adapter,
203 ... wireless section,
204 ... main control unit,
205 ... Memory,
206 ... communication interface unit,
207 ... Terminal control unit,
208: Channel codec,
209 ... error correction processing unit,
210 ... Timer,
211 ... voice communication circuit,
212 ... Headset.

Claims (9)

In a wireless communication system having a communication device and a control device that controls communication of the communication device ,
Of the plurality of control channels on the radio frame , the first control channel is used as a dedicated downlink control channel from the control device to the communication device, and the second control channel is used as the control device and the communication device. Is used in a competitive manner . In a control device that controls communication of other wireless communication devices,
Of the plurality of control channels on the radio frame, the first control channel is used as a dedicated downlink control channel from the control device to the other communication device, and the second control channel is used as the control device. A control device used in a competitive manner with the communication device. In claim 2 ,
Providing a plurality of the second control channels to be used in the contention method;
The control apparatus, wherein the control apparatus preferentially uses at least one of the plurality of second control channels. In claim 2 ,
Providing a plurality of the second control channels to be used in the contention method;
A control device that limits the number of usable second control channels based on a type of device including the control device and the communication device. In claim 2 ,
A control apparatus using the second control channel according to a priority of a data transmission request of the communication apparatus. In a wireless communication device that communicates under the control of a control device,
Of the plurality of control channels on the radio frame, the first control channel is used as a dedicated downlink control channel from the control device to the other communication device, and the second control channel is used as the control device. A wireless communication device used in a competitive manner with the communication device. In claim 6 ,
Providing a plurality of the second control channels to be used in the contention method;
The wireless communication apparatus, wherein the communication apparatus preferentially uses at least one of the plurality of second control channels. In claim 6 ,
Providing a plurality of the second control channels to be used in the contention method;
The wireless communication device, wherein the number of usable second control channels is limited based on a type of device including the control device and the communication device. In claim 6 ,
The wireless communication device, wherein the second control channel is used according to a priority of a data transmission request of the communication device.

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