JP2010010983A - Wireless communication system, wireless communication device, and wireless communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce decoding errors of a control signal. <P>SOLUTION: A base station 12 transmits the control signal including the same piece of control information to a mobile station 14 via each of a current control channel (ANCH(1)) and a new control channel (ANCH(2))to which a radio channel which is different from the current control channel is assigned (S116). The mobile station 14 acquires the control information from either of a control signal to be transmitted from the base station 12 via the current control channel (ANCH(1)) or a control signal to be transmitted from the base station 12 via the new control channel (ANCH(2)). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wireless communication system, a wireless communication apparatus, and a wireless communication method, and more particularly to stabilization of wireless communication.

  Radio channels used in the radio communication system are roughly classified into a control channel for transmitting / receiving control information and a communication channel for transmitting / receiving communication data.

  Among these, the requirements regarding the communication quality are particularly strict for the control channel. This is because it becomes difficult to maintain stable wireless communication if control information is not normally transmitted and received due to quality degradation of the control channel.

For this reason, in the next generation personal handy-phone system (PHS), for example, BPSK (Binary Phase) is used as an individual control channel ANCH (Anchor Channel) for individually transmitting and receiving control information between a base station and each mobile station. By applying modulation methods with low required SINR (Signal to Interference and Noise Ratio), such as Shift Keying (QPSK) or Quadrature Phase Shift Keying (QPSK), the occurrence of decoding errors in control information is suppressed. (See Non-Patent Document 1).
“ARIB STD-T95“ OFDMA / TDMA TDD Broadband Wireless Access System (NextGeneration PHS) ARIB STANDARD 1.0 ”, December 12, 2007, Japan Radio Industry Association

  However, if the SINR of a signal transmitted / received via a control channel is greatly reduced due to an increase in the distance between communication devices or interference from other cells, control information decoding errors cannot be sufficiently prevented even by the above-described conventional technique. In some cases, control channel switching or handover is required.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a wireless communication system, a wireless communication apparatus, and a wireless communication method that can reduce control signal decoding errors.

  In order to solve the above-described problem, a radio communication system according to the present invention is a radio communication system including first and second radio communication devices, and the first radio communication device includes a current control channel and a current control channel. Control signal transmitting means for transmitting a control signal including the same control information to each of the second wireless communication devices via each of the new control channels to which a wireless channel different from the control channel is assigned, The wireless communication device includes a control signal transmitted from the first wireless communication device via the current control channel and a control signal transmitted from the first wireless communication device via the new control channel. Control information acquisition means for acquiring the control information from any one of them is included.

  In the wireless communication system according to the present invention, the first wireless communication apparatus transmits a control signal including the same control information to the first wireless communication apparatus via different control channels. Thereby, the 2nd radio | wireless communication apparatus can acquire control information from the thing with a good reception state among the control signals received via each of these different control channels. Therefore, according to the present invention, control information decoding errors can be reduced, and stable wireless communication can be performed.

  In the aspect of the present invention, the first wireless communication device further includes channel allocating means for allocating at least one of the usable wireless channels to the new control channel. According to this aspect, when there are usable radio channels, the number of control channels for transmitting the same control signal can be increased.

  In the aspect of the invention, the first wireless communication device further includes reception quality detection means for detecting reception quality of a control signal transmitted from the second wireless communication device via the current control channel. The control signal transmission means includes the same control information via each of the current control channel and the new control channel when the reception quality detected by the reception quality detection means is less than a predetermined quality. Is transmitted to the second wireless communication apparatus. According to this aspect, when the reception quality of the control signal deteriorates, a control signal including the same control information can be transmitted via each of two or more different control channels.

  In the aspect of the invention, the channel allocating unit may allocate the current control channel based on the reception quality detected by the reception quality detecting unit when the number of the current control channels is 2 or more. It is determined whether to cancel the assignment to the current control channel for a part of the assigned radio channel. According to this aspect, the number of control channels can be increased or decreased according to the reception quality of the control signal.

  Also, in one aspect of the present invention, the first and second wireless communication apparatuses perform wireless communication by an orthogonal frequency division multiple access method, and the channel allocation unit includes the current control among the available wireless channels. A radio channel belonging to a subchannel different from the channel is assigned to the new control channel. According to this aspect, stable wireless communication can be performed using the orthogonal frequency division multiple access method.

  Also, in one aspect of the present invention, the first and second wireless communication apparatuses perform wireless communication by a time division multiple access method, and the channel allocation unit includes the current control channel among the available wireless channels. A radio channel belonging to a different time slot is assigned to the new control channel. According to this aspect, stable wireless communication can be performed using the time division multiple access method.

  Also, in one aspect of the present invention, the second wireless communication apparatus includes interference wave level detection means for detecting an interference wave level in the new control channel, and the number of the new control channels is 2 or more. Channel assignment refusal for deciding whether to reject assignment of a part of the radio channel assigned to the new control channel to the new control channel based on the interference wave level detected by the interference wave level detecting means Means. According to this aspect, the control signal can be transmitted using the radio channel with less interference.

  In addition, the first wireless communication apparatus according to the present invention provides a control signal including the same control information via each of the current control channel and a new control channel to which a wireless channel different from the current control channel is assigned. Control signal transmission means for transmitting to the wireless communication apparatus.

  The second wireless communication apparatus according to the present invention is the same as that transmitted from the first wireless communication apparatus via each of the current control channel and a new control channel to which a wireless channel different from the current control channel is assigned. Control signal receiving means for receiving a control signal including control information for each of the current control channel and the new control channel, a control signal received via the current control channel, and the new control channel And a control information acquisition means for acquiring the control information from any of the control signals received via the control signal.

  In addition, the wireless communication method according to the present invention allows the first wireless communication device to transmit the same control information via each of the current control channel and a new control channel to which a wireless channel different from the current control channel is assigned. Including a control signal including the control signal transmitted from the first wireless communication device via the current control channel, and the new control. Obtaining the control information from any one of the control signals transmitted from the first wireless communication device via the channel.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a configuration diagram of a mobile communication system 10 according to an embodiment of the present invention. As shown in the figure, the mobile communication system 10 includes a base station 12 (only one is shown here), a plurality of mobile stations 14 (here, only mobile stations 14-1 to 14-3 are shown), It is comprised including.

  The base station 12 uses a plurality of OFDMA (Orthogonal Frequency Division Multiple Access) and TDMA / TDD (Time Division Multiple Access / Time Division Duplex) methods. Multiple communication with the mobile station 14 can be performed.

  FIG. 2 is a diagram showing a radio channel configuration of the mobile communication system 10. As shown in the figure, in the mobile communication system 10, a 5 ms TDMA frame is divided into eight time slots, of which four slots are allocated to the uplink and the remaining four slots are allocated to the downlink. . Each radio channel of the mobile communication system 10 is configured by a combination of one of these time slots based on the TDMA / TDD scheme and one of subchannels based on the OFDMA scheme, and each is called a PRU (Physical Resource Unit).

  Among these, a specific PRU (for example, the uppermost PRU shown in FIG. 2) is a radio channel dedicated to a common channel (CCH), and the other PRUs are assigned to each mobile station 14 individually. (Anchor Channel) and an EXCH (Extra Channel) radio channel for an individual channel (Individual Channel: ICH). Also, the four uplinks and the four downlinks make a pair, and the paired uplink and downlink are respectively assigned to the same common channel or the same individual channel.

  When the base station 12 receives the link channel establishment request from the mobile station 14 via the CCH (common channel), the base station 12 allocates one of the usable PRUs to the ANCH (dedicated control channel). Then, the base station 12 transmits a link channel establishment response including the channel ID of the PRU to the mobile station 14 via the CCH in order to notify the mobile station 14 of the PRU assigned to the ANCH. The mobile station 14 specifies the PRU assigned to the ANCH by the base station 12 based on the channel ID included in the link channel establishment response.

  Thereafter, the base station 12 and the mobile station 14 transmit / receive a control signal including control information via the PRU assigned to the ANCH. For example, the base station 12 determines one or more PRUs to be assigned to EXCH (communication channel) for each TDMA frame based on carrier sense and the like, and transmits a control signal including MAP information indicating the determined PRU for EXCH to the mobile station 14 to send.

  In the mobile communication system 10 according to the present embodiment, the base station 12 increases the number of PRUs allocated to the ANCH from 1 to 2 or more based on the reception quality of the control signal received via the ANCH, and the PRUs. A control signal including the same control signal is transmitted to the mobile station 14 via each. Then, the mobile station 14 obtains control information from control signals having good reception status among control signals received via two or more different PRUs assigned to the ANCH. In this way, the mobile communication system 10 reduces control information decoding errors and stabilizes wireless communication.

  Below, the structure with which the base station 12 and the mobile station 14 are provided in order to implement | achieve the said process is demonstrated.

  FIG. 3 is a functional block diagram of the base station 12. As shown in the figure, the base station 12 includes an antenna 20, a radio communication unit 22, a demodulation unit 24, a decoding unit 26, a control unit 28 (reception quality detection unit 30, channel control unit 32, control information acquisition unit 34), A physical frame forming unit 36 and a modulation unit 38 are included.

  The antenna 20 receives a radio signal and outputs the received radio signal to the radio communication unit 22. Further, the antenna 20 transmits a radio signal supplied from the radio communication unit 22 to the mobile station 14. Note that reception and transmission of radio signals are switched every four slots.

  The wireless communication unit 22 includes a low noise amplifier, a power amplifier, a local oscillator, a mixer, and a filter. The radio communication unit 22 amplifies a radio signal input from the antenna 20 with a low noise amplifier, down-converts the radio signal into an intermediate frequency signal, and then outputs the signal to the demodulation unit 24. The radio communication unit 22 up-converts the modulation signal input from the modulation unit 38 into a radio signal, amplifies it to a transmission output level with a power amplifier, and supplies the signal to the antenna 20.

  The demodulator 24 includes an A / D converter, a serial-parallel converter, an FFT (Fast Fourier Transform) arithmetic unit, and a parallel-serial converter. The demodulator 24 performs GI (Guard Interval) removal, A / D conversion, serial-parallel conversion, discrete Fourier transform, parallel-serial conversion, and the like on the analog received signal input from the wireless communication unit 22. Get a sequence of complex symbols. The complex symbol sequence acquired in this way is output to the decoding unit 26. The demodulator 24 also divides the complex symbol of each subcarrier obtained by the discrete Fourier transform for each subchannel, and supplies the divided complex symbol of each subchannel to the controller 28.

  The decoding unit 26 decodes the reception data corresponding to the symbol modulation scheme from the complex symbol sequence input from the demodulation unit 24, and outputs the decoded reception data to an upper layer (not shown).

  The physical frame formation unit 36 stores transmission data input from an upper layer (not shown) in a physical frame corresponding to a common channel (CCH) or a dedicated channel (ANCH, EXCH, etc.), and stores the physical frame in the modulation unit 38. Output.

  The modulation unit 38 includes a serial-parallel converter, an IFFT (Inverse Fast Fourier Transform) calculation unit, a parallel-serial converter, and a D / A converter. The modulation unit 38 performs symbol mapping (assignment of amplitude and phase) on the physical frame input from the physical frame forming unit 36 in accordance with the modulation scheme specified by the control unit 28 to obtain a complex symbol sequence. Then, the modulation unit 38 performs serial / parallel conversion, inverse discrete Fourier transform, parallel / serial conversion, D / A conversion, and the like on the obtained complex symbol sequence, and outputs a signal obtained by adding GI to the generated baseband OFDM signal. Output to the wireless communication unit 22.

  The control unit 28 includes, for example, a CPU (Central Processing Unit) and a program that controls the operation of the CPU, and controls each unit of the base station 12. In particular, the control unit 28 functionally includes a reception quality detection unit 30, a channel control unit 32, and a control signal acquisition unit 34, and controls the number of PRUs allocated to the ANCH and through the PRUs allocated to the ANCH. The wireless communication with the mobile station 14 is controlled based on the received control signal.

  Based on the complex symbol of each subchannel input from the demodulator 24, the reception quality detector 30 receives the mobile station 14 via each of one or more PRUs (hereinafter referred to as “current ANCH”) currently assigned to the ANCH. The reception quality (for example, SINR) of the control signal transmitted from is detected.

  The channel control unit 32 controls allocation of PRUs to common channels (CCH) and dedicated channels (ANCH, EXCH, etc.). In particular, the channel control unit 32 controls the number of PRUs assigned to the ANCH based on the reception quality of the control signal detected by the reception quality detection unit 30.

  When all or part of the reception quality of the control signal received via each of the one or more current ANCHs does not satisfy the predetermined quality (for example, when the SINR of the control signal is less than the predetermined value), the channel control unit 32 Assigns at least one usable PRU different from the current ANCH as a new ANCH. Here, usable PRUs are, for example, jamming waves detected by carrier sense among PRUs (free PRUs) that are not assigned to either a common channel (CCH) or a dedicated channel (ANCH, EXCH, etc.). A level is less than a predetermined level.

  Then, the channel control unit 32 transmits an ANCH addition instruction including the channel ID of the PRU assigned as a new ANCH (hereinafter referred to as “new ANCH”) to the mobile station 14, and via each of the current ANCH and the new ANCH. The physical frame forming unit 36 and the modulating unit 38 are instructed to transmit a control signal including the same control information to the mobile station 14. As a result, the mobile station 14 can acquire control information from control signals having good reception states among control signals received via two or more different PRUs assigned to the ANCH. Occurrence of information decoding errors is suppressed.

  Note that when there are a plurality of usable PRUs, the channel control unit 32 may assign a PRU having a lower correlation related to the radio state with the current ANCH to the new ANCH. For example, the channel control unit 32 may allocate a PRU belonging to a subchannel different from the current ANCH among usable PRUs to the new ANCH, or a PRU belonging to a time slot different from the current ANCH among usable PRUs. May be assigned to the new ANCH. In this way, it is possible to reduce the probability that the reception quality of the control signal transmitted through each of the current ANCH and the new ANCH will deteriorate at the same time.

  On the other hand, when the number of current ANCHs is 2 or more, the channel control unit 32 determines the current PRU assigned to the current ANCH based on the reception quality of the control signal detected by the reception quality detection unit 30. It may be determined whether to deallocate the ANCH. For example, the channel control unit 32 may release the assignment of the control information among the PRUs assigned to the current ANCH to the current ANCH for the PRU whose reception quality of control information is less than a predetermined quality, or assigned to the current ANCH. Allocation of the PRU other than the PRU having the highest control information reception quality among the PRUs to the current ANCH may be released. In this way, the number of ANCHs can be increased or decreased according to the reception quality of the control signal.

  Note that the channel control unit 32 may control the number of PRUs allocated to the ANCH based on a request or notification from the mobile station 14. For example, the channel control unit 32 may increase the number of PRUs allocated to the ANCH in response to an ANCH addition request from the mobile station 14, or may respond to an ANCH rejection notification returned from the mobile station 14 in response to a new ANCH notification. The allocation to the new ANCH for the specified PRU may be released.

  The control information acquisition unit 34 acquires control information from a control signal transmitted from the mobile station 14 via the PRU assigned to the ANCH, and controls wireless communication with the mobile station 14 based on the acquired control signal. . In particular, when the number of PRUs allocated to the ANCH is two or more, the control information acquisition unit 34 receives reception in which control information is normally decoded among control signals received via two or more different ANCHs. A control signal is acquired from a control signal in good condition. Thereby, since the decoding error of control information is reduced, the base station 12 can perform stable wireless communication with the mobile station 14. The success or failure of the decoding of the control information can be confirmed by, for example, a CRC (Cyclic Redundancy Checking) check.

  FIG. 4 is a functional block diagram of the mobile station 14. As shown in the figure, the mobile station 14 includes an antenna 40, a radio communication unit 42, a demodulation unit 44, a decoding unit 46, a control unit 48 (interference wave level detection unit 50, channel control unit 52, control information acquisition unit 54). , A physical frame forming unit 56, and a modulation unit 58.

  The antenna 40 receives a radio signal and outputs the received radio signal to the radio communication unit 42. The antenna 40 transmits a radio signal supplied from the radio communication unit 42 to the base station 12. Note that reception and transmission of radio signals are switched every four slots.

  The wireless communication unit 42 includes a low noise amplifier, a power amplifier, a local oscillator, a mixer, and a filter. The radio communication unit 42 amplifies the radio signal input from the antenna 40 with a low noise amplifier, down-converts the radio signal to an intermediate frequency signal, and outputs the signal to the demodulation unit 44. Further, the radio communication unit 42 up-converts the modulation signal input from the modulation unit 58 into a radio signal, amplifies the signal to a transmission output level with a power amplifier, and then supplies the signal to the antenna 40.

  The demodulator 44 includes an A / D converter, a serial / parallel converter, an FFT operation unit, and a parallel / serial converter. The demodulator 44 performs GI removal, A / D conversion, serial / parallel conversion, discrete Fourier transform, parallel / serial conversion, and the like on the analog received signal input from the wireless communication unit 42 to obtain a continuous complex symbol sequence. To do. The complex symbol sequence acquired in this way is output to the decoding unit 46.

  The decoding unit 46 decodes the reception data corresponding to the symbol modulation scheme from the complex symbol sequence input from the demodulation unit 44, and outputs the decoded reception data to an upper layer (not shown).

  The physical frame forming unit 56 stores transmission data input from an upper layer (not shown) in a physical frame corresponding to a common channel (CCH) or a dedicated channel (ANCH, EXCH, etc.), and stores the physical frame in the modulation unit 58. Output.

  The modulation unit 58 includes a serial / parallel converter, an IFFT calculation unit, a parallel / serial converter, and a D / A converter. The modulation unit 58 performs symbol mapping according to the modulation scheme specified by the control unit 48 on the physical frame input from the physical frame forming unit 56 to obtain a complex symbol sequence. Then, the modulation unit 58 performs serial-parallel conversion, inverse discrete Fourier transform, parallel-serial conversion, D / A conversion, and the like on the obtained complex symbol sequence, and a signal obtained by adding GI to the generated baseband OFDM signal. The data is output to the wireless communication unit 42.

  The control unit 48 includes, for example, a CPU and a program that controls the operation of the CPU, and controls each unit of the mobile station 14. In particular, the control unit 48 functionally includes an interference wave level detection unit 50, a channel control unit 52, and a control information acquisition unit 54, and is based on a control signal received via a PRU assigned to the ANCH. 12 to control the wireless communication with 12.

  The interference wave level detection unit 50 detects the interference wave level in the PRU indicated by the channel ID included in the link channel establishment response from the base station 12 or the ANCH addition instruction by carrier sense.

  Based on the jamming wave level detected by the jamming wave level detection unit 50, the channel control unit 52 determines whether or not the PRU indicated by the channel ID included in the link channel establishment response or the ANCH addition instruction from the base station 12 can be used. To do. Specifically, the channel control unit 52 determines that a PRU whose interference wave level detected by the interference wave level detection unit 50 is less than a predetermined level among the PRUs notified from the base station 12 can be used. It is determined that other PRUs cannot be used.

  Then, the channel control unit 52 transmits an ANCH rejection notification specifying the PRU determined to be unusable to the base station 12 in order to reject assignment of the PRU determined to be unusable to the ANCH. On the other hand, the channel control unit 52 accepts assignment of the PRU determined to be usable to the ANCH, and transmits a control signal including the same control information to the base station 12 via each of the PRUs assigned to the ANCH. The physical frame forming unit 56 and the modulating unit 58 are instructed.

  When all or part of the reception quality of the control signal received via each PRU assigned to the ANCH is less than a predetermined quality (for example, when the SINR of the control signal is less than a predetermined value), The channel control unit 52 may transmit an ANCH addition request for adding a PRU to be allocated to the ANCH to the base station 12.

  The control information acquisition unit 54 acquires control information from a control signal transmitted from the base station 12 via the PRU assigned to the ANCH, and controls wireless communication with the base station 12 based on the acquired control signal. . In particular, when the number of PRUs assigned to the ANCH is two or more, the control information acquisition unit 54 receives reception in which control information is normally decoded among control signals received via two or more different ANCHs. A control signal is acquired from a control signal in good condition. Thereby, since the decoding error of control information is reduced, the mobile station 14 can perform stable wireless communication with the base station 12.

  Next, an example of the ANCH addition process performed between the base station 12 and the mobile station 14 will be described with reference to the sequence diagram shown in FIG. As shown in the figure, here, link channel establishment has been completed between the base station 12 and the mobile station 14, and the base station 12 and the mobile station 14 have one PRU (here, It is assumed that a control signal is transmitted / received via “ANCH (1)” (S100). The base station 12 and the mobile station 14 transmit / receive information related to transmission / reception of communication data (MAP information indicating the PRU allocated to EXCH, modulation scheme, transmission power, transmission timing, etc.) via the ANCH (1). (S102, S104).

  Here, for example, when the reception quality of the control signal received via the ANCH (1) is less than the predetermined quality, the mobile station 14 transmits an ANCH addition request for adding an ANCH PRU to the base station 12. (S106). When the base station 12 receives the ANCH addition request from the mobile station 14, the base station 12 selects one PRU from the available PRUs, and represents the selected PRU as a new ANCH (here, “ANCH (2)”). (S108). Then, the base station 12 transmits an ANCH addition instruction including the channel ID of the PRU assigned to the ANCH (2) to the mobile station 14 (S110).

  When receiving the ANCH addition instruction from the base station 12, the mobile station 14 detects the interference wave level in the PRU indicated by the channel ID included in the ANCH addition instruction by carrier sense (S112). If the detected interference wave level is less than the predetermined level, the mobile station 14 accepts the assignment of ANCH (2) to the PRU indicated by the channel ID.

  The mobile station 14 that has received the assignment of the ANCH (2) transmits a control signal including the same control information to the base station 12 via each of the ANCH (1) and the ANCH (2) used so far. (S114). The base station 12 receives the control signal via each of the ANCH (1) and the ANCH (2), and acquires control information from one of the control signals.

  Further, the base station 12 transmits a control signal including the same control information to the mobile station 14 via each of the ANCH (1) and the ANCH (2) (S116). The mobile station 14 receives a control signal via each of the ANCH (1) and ANCH (2), and acquires control information from either of the control signals.

  Thereafter, the base station 12 and the mobile station 14 transmit and receive the same control signal via each of the ANCH (1) and the ANCH (2) (S118, S120), and appropriately assign them to the ANCH according to the reception quality of the control signal. Increase or decrease the number of PRUs.

  Note that, as shown in FIG. 6, the base station 12 determines whether the reception quality of the control signal received via the ANCH, for example, has become less than the predetermined quality, regardless of the presence or absence of the ANCH addition request from the mobile station 14. Thus, the number of PRUs allocated to the ANCH may be increased.

  According to the mobile communication system 10 described above, the base station 12 increases the number of PRUs allocated to the ANCH from 1 to 2 or more based on the reception quality of the control signal received via the ANCH, and the PRUs. A control signal including the same control information is transmitted to the mobile station 14 via each. Then, the mobile station 14 obtains control information from control signals having good reception status among control signals received via two or more different PRUs assigned to the ANCH. For this reason, the decoding error of control information can be reduced, and stable wireless communication with a low frequency of ANCH switching and a frequency of handover activation can be realized.

  The present invention is not limited to the above embodiment.

  For example, in the above embodiment, the base station 12 selects the PRU assigned to the ANCH. However, the mobile station 14 may select the PRU assigned to the ANCH.

  The present invention can be widely applied not only to a mobile communication system including a base station and a plurality of mobile stations, but also to a general wireless communication system including two or more wireless communication devices.

1 is a configuration diagram of a mobile communication system according to an embodiment of the present invention. It is a figure which shows the radio | wireless channel structure of a mobile communication system. It is a functional block diagram of the base station which concerns on embodiment of this invention. It is a functional block diagram of the mobile station which concerns on embodiment of this invention. It is a sequence diagram which shows an example of the ANCH addition process which concerns on embodiment of this invention. It is a sequence diagram which shows the other example of the ANCH addition process which concerns on embodiment of this invention.

Explanation of symbols

  10 mobile communication systems, 12 base stations, 14 mobile stations, 20, 40 antennas, 22, 42 wireless communication units, 24, 44 demodulation units, 26, 46 decoding units, 28, 48 control units, 30 reception quality detection units, 32 , 52 Channel control unit, 34, 54 Control information acquisition unit, 36, 56 Physical frame formation unit, 38, 58 modulation unit, 50 Interference wave level detection unit.

Claims (10)

A wireless communication system including first and second wireless communication devices,
The first wireless communication device is:
Control signal transmitting means for transmitting a control signal including the same control information to the second radio communication device via each of the current control channel and a new control channel to which a radio channel different from the current control channel is allocated; Including
The second wireless communication device is:
The control from one of a control signal transmitted from the first wireless communication device via the current control channel and a control signal transmitted from the first wireless communication device via the new control channel Including control information acquisition means for acquiring information,
A wireless communication system. The wireless communication system according to claim 1, wherein
The first wireless communication apparatus further includes channel allocating means for allocating at least one of available wireless channels to the new control channel.
A wireless communication system. The wireless communication system according to claim 1 or 2,
The first wireless communication apparatus further includes reception quality detection means for detecting reception quality of a control signal transmitted from the second wireless communication apparatus via the current control channel,
The control signal transmission means includes the same control information via each of the current control channel and the new control channel when the reception quality detected by the reception quality detection means is less than a predetermined quality. Transmitting a control signal to the second wireless communication device;
A wireless communication system. The wireless communication system according to claim 3,
The channel allocating means, when the number of the current control channels is 2 or more, based on the reception quality detected by the reception quality detection means, for the part of the radio channel allocated to the current control channel Decide whether to deallocate the current control channel,
A wireless communication system. In the radio | wireless communications system in any one of Claim 2 to 4,
The first and second wireless communication devices perform wireless communication by an orthogonal frequency division multiple access method,
The channel allocating means allocates a radio channel belonging to a subchannel different from the current control channel among the usable radio channels to the new control channel.
A wireless communication system. In the radio | wireless communications system in any one of Claim 2 to 5,
The first and second wireless communication devices perform wireless communication by a time division multiple access method,
The channel allocation means allocates a radio channel belonging to a time slot different from the current control channel among the available radio channels to the new control channel.
A wireless communication system. In the radio | wireless communications system in any one of Claim 1 to 6,
The second wireless communication device is:
Jamming wave level detecting means for detecting the jamming wave level in the new control channel;
When the number of the new control channels is 2 or more, based on the jamming wave level detected by the jamming wave level detection means, to the new control channel for a part of the radio channel allocated to the new control channel Channel assignment refusal means for deciding whether or not to refuse the assignment,
A wireless communication system, further comprising: Control signal transmitting means for transmitting a control signal including the same control information to another wireless communication device through each of the current control channel and a new control channel to which a wireless channel different from the current control channel is assigned,
A wireless communication device comprising: A control signal including the same control information transmitted from another radio communication device via each of the current control channel and a new control channel to which a radio channel different from the current control channel is allocated, Control signal receiving means for receiving via each of the new control channels;
Control information acquisition means for acquiring the control information from any one of a control signal received via the current control channel and a control signal received via the new control channel;
A wireless communication apparatus comprising: The first radio communication device sends a control signal including the same control information to the second radio communication device via each of the current control channel and a new control channel to which a radio channel different from the current control channel is assigned. Sending, and
A control signal transmitted from the first wireless communication device via the current control channel and a control signal transmitted from the first wireless communication device via the new control channel. Obtaining the control information from any of the signals;
A wireless communication method comprising:

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