Entitled wireless communication system, a communication apparatus and a processing method Technical field [0001] 　The present invention relates to a radio communication system, a communication apparatus and a processing method. Background technique [0002] 　Conventionally, LTE mobile communication such as (Long Term Evolution) and LTE-advanced is known. Further, unlicensed Dobando (Unlicensed band ') technique for performing wireless communication using the shared band, such as has been studied (see, for example, Patent Documents 1-4.). CITATION Patent Document [0003] Patent Document 1: Japanese Patent Publication No. 2013-523018 Patent Document 2: Japanese Patent Publication No. 2008-518541 Patent Document 3: Laid-Open Patent Publication No. 2006-203361 Patent Document 4: Laid-Open Patent Publication No. 2007-312078 Summary of the Invention Problems that the Invention is to Solve [0004] 　However, in the prior art described above, in the shared band, for example if the terminal when transmitting a wireless signal using radio resources allocated by the base station, another radio communication system is using the radio resource there is. Therefore, not to send radio signals, which may throughput decreases. [0005] 　In one aspect, the present invention relates to a radio communication system which can improve the throughput, and to provide a communication apparatus and a processing method. Means for Solving the Problems [0006] 　To solve the above problems and achieve an object, according to one aspect of the present invention, the first communication apparatus using a predetermined bandwidth to be shared with another wireless communication system is a radio from a second communication device in a wireless communication system for receiving a signal, the first communication device, allocates a first candidate and second candidate of resources used in the predetermined band to the second communication device, said second communication device, the first communication performs detection of free radio resources based on the first candidate and the second candidate of the allocation result by the device, when the first candidate is free uses the first candidate to the first communication device transmits a radio signal, the first case the candidate is empty yet not the second candidate vacant radio communication system for transmitting a radio signal to the first communication device using said second candidate, a communication device and processing The law is proposed. Effect of the Invention [0007] 　According to one aspect of the present invention, an effect that it is possible to improve the throughput. BRIEF DESCRIPTION OF THE DRAWINGS [0008] [Figure 1A] Figure 1A is a diagram illustrating an example of a wireless communication system according to the first embodiment. FIG 1B] Figure 1B is a diagram showing an example of a flow of signals in the wireless communication system shown in Figure 1A. FIG. 2 is a diagram illustrating an example of an uplink communication in a wireless communication system according to the first embodiment. [Figure 3A] Figure 3A is a diagram illustrating an example of a base station. [Figure 3B] Figure 3B is a diagram showing an example of signal flow in a base station shown in FIG. 3A. FIG 3C] Figure 3C is a diagram illustrating an example of a hardware configuration of the base station. [Figure 4A] Figure 4A is a diagram illustrating an example of a terminal. [Figure 4B] Figure 4B is a diagram illustrating an example of a signal flow in the terminal shown in FIG. 4A. [Figure 4C] Figure 4C is a diagram illustrating an example of a hardware configuration of the terminal. FIG. 5 is a flowchart illustrating an example of processing by the base station according to the first embodiment. [6] FIG 6 is a flowchart illustrating an example of processing by the terminal according to the first embodiment. [7] FIG. 7 is a flowchart showing a modification of the processing by the base station according to the first embodiment. [8] FIG. 8 is a flowchart showing a modification of the process by the terminal according to the first embodiment. [9] FIG. 9 is a diagram illustrating an example of an uplink communication in a wireless communication system according to the second embodiment. [10] FIG 10 is a flowchart illustrating an example of processing by the base station according to the second embodiment. [11] FIG 11 is a flowchart illustrating an example of processing by the terminal according to the second embodiment. [12] FIG 12 is a diagram illustrating an example of an uplink communication in a wireless communication system according to the third embodiment. [13] FIG 13 is a diagram showing an example of a back-off value for each resource set in each terminal. [14] FIG 14 is a flowchart illustrating an example of processing by the base station according to the third embodiment. [15] FIG 15 is a flowchart illustrating an example of processing by the terminal according to the third embodiment. [Figure 16A] Figure 16A is a diagram (1) showing an example of an uplink communication in a wireless communication system according to the fourth embodiment. [FIG. 16B] FIG 16B is a diagram (2) showing an example of an uplink communication in a wireless communication system according to the fourth embodiment. [17] FIG 17 is a flowchart illustrating an example of processing by the base station according to the fourth embodiment. [18] FIG 18 is a flowchart illustrating an example of processing by the terminal according to the fourth embodiment. [FIG. 19A] FIG 19A is a diagram (1) showing an example of an uplink communication in a wireless communication system according to a modification of the fourth embodiment. [FIG. 19B] FIG 19B is a diagram (2) showing an example of an uplink communication in a wireless communication system according to a modification of the fourth embodiment. [20] FIG 20 is a flowchart illustrating an example of processing by the terminal according to a modification of the fourth embodiment. [21] FIG 21 is a diagram illustrating an example of an uplink communication in a wireless communication system according to the fifth embodiment. [22] FIG 22 is a flowchart illustrating an example of processing by the base station according to the fifth embodiment. [23] FIG 23 is a flowchart illustrating an example of processing by the terminal according to the fifth embodiment. [24] FIG 24 is a diagram illustrating an example of an uplink communication in a wireless communication system according to the sixth embodiment. [25] FIG 25 is a flowchart illustrating an example of processing by the base station according to the sixth embodiment. DESCRIPTION OF THE INVENTION [0009] 　With reference to the drawings, a radio communication system according to the present invention, an embodiment of the communication device and processing methods in detail. [0010] (Embodiment 1) (a wireless communication system according to the first embodiment) 　FIG. 1A is a diagram showing an example of a wireless communication system according to the first embodiment. Figure 1B is a diagram showing an example of a flow of signals in the wireless communication system shown in Figure 1A. Figure 1A, 1B, the radio communication system 100 according to the first embodiment includes a first communication device 110, and the second communication device 120. [0011] 　Examples of the first communication device and the second communication device, base station and terminal in a cellular communication and the like. As another example of the first communication apparatus and second communication apparatus, a first terminal and a second terminal in a direct communication between terminals (Device-to Device Communication) and the like. In the following embodiment, the first communication device 110 is a base station is (hereinafter, referred to as "base station 110".), The second communication device 120 is a terminal (hereinafter, referred to as "terminal 120".) described in the example of a case. [0012] 　In the wireless communication system 100, the wireless communication system 100 using a predetermined bandwidth to be shared with another wireless communication system, transmission of a radio signal from the terminal 120 to the base station 110 is performed. As an example, in a wireless communication system 100, the wireless communication due to LTE and LTE-A are performed. [0013] 　A predetermined band is, for example, unlicensed Dobando (unlicensed band). Unlicensed Dobando, as an example, and the like ISM (Industry-Science-Medical) band (2.4 [GHz] band) and 5 [GHz] band. Other wireless communication systems, as an example WLAN: a wireless communication system (Wireless Local Area Network Wireless Local Area Network). Also, other communication system may be a wireless communication system, such as different LTE and LTE-A and the wireless communication system 100. [0014] 　Base station 110, an allocation unit 111, a receiving unit 112, a first communication device comprising a. Assignment section 111 assigns the first candidate and second candidate of resources used in a given band to a terminal 120. Using the resource is a radio resource used for transmission of radio signals from terminal 120 to base station 110. The first candidate and second candidate of resources used is a respective radio resource included in a predetermined band, a different respective radio resources. [0015] 　Radio resources, for example, a combination of time resources, frequency resources or time and frequency resources. As an example, the radio resource is CC (Component Carrier: component carrier), RB: can be a (Resource Block Resource Block), or sub-frame. [0016] 　Allocation section 111 notifies the allocation result of the first candidate and the second candidate to the terminal 120 to the receiver 112. Further, allocation section 111 notifies the allocation result of the first candidate and the second candidate to the terminal 120 to the terminal 120. For example, allocation section 111, the allocation result of the first candidate and second candidate and notifies the terminal 120 by transmitting control information to the terminal 120. [0017] 　The transmission of control information by the allocation section 111, for example, wireless communication system 100 may use the band occupied. Band wireless communication system 100 is proprietary, as an example is a license Dobando assigned to the operator of the wireless communication system 100. Or it may be used unlicensed Dobando the transmission of control information by the allocation section 111. [0018] 　The control information allocation section 111 sends, as an example, PDCCH (Physical Downlink Control Channel: PDCCH) or E-PDCCH: the use of (Enhanced-Physical Downlink Control Channel extended physical downlink control channel) can. [0019] 　For example, the control information allocation section 111 is transmitted, it can be directly indicated by the information of the first candidate and second candidate assigned to terminal 120. Thus, allocation section 111 can allocate the respective first candidate and second candidate flexibly. [0020] 　Or control information allocation section 111 is transmitted may be information indicating the first candidate, the relationship between the first candidate and the second candidate, the. This allows the allocation unit 111 suppress the increase in the overhead of the control information to be transmitted. Relationship between the first candidate and the second candidate, for example, may be a difference between the first candidate and the second candidate. The difference between the first candidate and the second candidate may be, for example, the difference of time, the frequency of the difference or the respective differences in time and frequency. In this case, the terminal 120 includes a first candidate indicated by the received control information, and the difference indicated by the received control information, the second candidate may be identified based on. [0021] 　Or it may be previously shared between the base station 110 and the terminal 120 the relationship between the first candidate and the second candidate. For example, it the base station 110 the relationship between the first candidate and the second candidate to be shared between that in the base station 110 and the terminal 120 the relationship between the first candidate and the second candidate to be notified to the terminal 120 it can. The notification from the base station 110 of the relationship between the first candidate and the second candidate to the terminal 120, for example RRC: can be used control signals, such as (Radio Resource Control Radio Resource Control) signal. [0022] 　In this case, control information allocation section 111 is sent may be a second candidate indirectly indicate information by indicating the first candidate directly. This allows the allocation unit 111 suppress the increase in the overhead of the control information to be transmitted. Terminal 120, a first candidate showing control information received, the relationship between the first candidate and the second candidate which has been shared between the base station 110, is possible to identify the second candidate on the basis of it can. [0023] 　Receiving unit 112, based on the first candidate and second candidate allocation result notified from allocation section 111 performs reception processing for each radio resource of the first candidate and second candidate assigned to terminal 120. This allows the terminal 120 also transmits radio signals to any of the first candidate and second candidate, receives the signal terminal 120 has transmitted. [0024] 　The receiving unit 112 first performs a receiving process of the first candidate may be performed reception processing of the second candidate only if it can not receive a radio signal from the terminal 120 by the reception processing of the first candidate. Thus, it is possible to perform the receiving process in the receiving unit 112 efficiently. In this case, for example, the receiving unit 112, leave buffering the received signal for the second candidate, if it can not receive a radio signal from the terminal 120 by the reception processing of the first candidate, and buffers It performs reception processing such as decoding for Oita received signal of the second candidate. [0025] 　Or, allocation section 111 may set the radio resource after the second candidate temporally than the first candidate. Thus, the receiving unit 112 also receives signals for the second candidate without first buffering, reception of the second candidate if it can not receive a radio signal from the terminal 120 by the reception processing of the first candidate processing can be performed. [0026] 　The receiving unit 112 is, for example, for the received radio signal, demodulates and decodes based on the encoding method and modulation specified for the terminal 120, upon a successful decoding, the wireless signal from the terminal 120 it can be determined that the received. The decoding in this case, for example, CRC (Cyclic Redundancy Check: cyclic redundancy check) or the like can be used. [0027] 　Terminal 120, a detection unit 121, a transmission unit 122, a second communication device comprising a. Detector 121, which is notified from the base station 110, based on the allocation result to the first candidate and the second candidate terminal 120 use resources in a given band, to detect a vacant radio resource. For example, detector 121 may identify the first candidate and second candidate by receiving the control information transmitted from the base station 110. [0028] 　Further, detector 121, for example, detects the space in the first candidate and the second candidate. Or, detector 121 first detects the vacancy of the first candidate may be detecting a free second candidate only if the first candidate is not available. Detector 121 notifies the detection result to the transmitting unit 122. [0029] 　Transmitting unit 122, based on the notified detection result from the detecting unit 121, if the first candidate is free to transmit a radio signal to the base station 110 using the first candidate. Further, the transmission unit 122, if the second candidate not empty first candidate is free to transmit a radio signal to the base station 110 using the second candidate. Further, the transmission unit 122, when the first candidate and second candidate is not available, does not transmit a radio signal, for example to the base station 110. [0030] 　Further, the transmission unit 122, when the first candidate and second candidate is free transmits a radio signal for example using only the first candidate to the base station 110. Or, transmitting unit 122, when the first candidate and second candidate is free may transmit a radio signal to the base station 110 using both the first candidate and the second candidate. [0031] 　Thus, according to the radio communication system 100 can be a base station 110 allocates a plurality of candidate radio resources in a predetermined band shared with other wireless communication system terminal 120. Further, the terminal 120 performs detection of free radio resources, it is possible to transmit uplink signals by radio resource vacant ones of the plurality of candidates assigned by the base station 110. This increases the success rate of transmission of a radio signal from the terminal 120 to the base station 110 in a predetermined band shared with other wireless communication systems, it is possible to improve the throughput. [0032] 　Figure 1A, in the example shown in Figure 1B, the base station 110 has been described to assign first candidate and second candidate of resources used on the terminal 120, the base station 110 of the third and subsequent use resources to the MS 120 candidates it may be assigned. For example, the terminal 120 is not empty first candidate and second candidate, when the third candidate is free to use the third candidate to the base station 110 transmits a radio signal. [0033] 　Figure 1A, in the example shown in FIG. 1B, respectively a first communication device 110 and the second communication device 120 is shown an example of the operation in the case of a base station 110 and terminal 120 in the cellular communication, the first communication device 110 and the second If the communication device 120 of the first terminal and the second terminal in a communication respectively directly between terminals, the information of the radio resources allocated allocation unit 111 by the upper device (not shown) (e.g. a base station in a cellular communication) first notification to the second terminal may have a function of (transfer). [0034] (Uplink communication in a wireless communication system according to the first embodiment) 　FIG. 2 is a diagram illustrating an example of an uplink communication in a wireless communication system according to the first embodiment. 2, the horizontal axis represents time and the vertical axis represents the frequency. Downlink license Dobando the vertical axis is the band used by the base station 110 of the license Dobando to radio transmission to the terminal 120. Uplink unlicensed Dobando the vertical axis is the band used by the terminal 120 of the Unlicensed Dobando to radio transmission to the base station 110. [0035] 　Control CH210 is a control CH to the base station 110 transmits the downlink license Dobando to terminal 120 (control channel). Control CH210 includes information specifying a first candidate 221 and the second candidate 222 use resources of the transmission of the uplink data from terminal 120 to base station 110. The first candidate 221 and the second candidate 222 is a band included in the uplink unlicensed Dobando respectively. First candidate 221, priority than the second candidate 222 has a high use resources. The control CH210, as an example, it is possible to use the PDCCH and E-PDCCH. [0036] 　Terminal 120, based on the received control CH210, band carrier sensing 230 including a first candidate 221 and the second candidate 222: performing (CS Carrier Sense). In the example shown in FIG. 2, the terminal 120 is just prior to the time domain of the first candidate 221 and the second candidate 222 is performed carrier sense 230 of the entire region of the uplink Unlicensed Dobando. [0037] 　Further, in the example shown in FIG. 2, the terminal 120 as a result of the carrier sense 230, for the first candidate 221 determines that the other system interference 240 is busy (Busy), free for the second candidate 222 (Idle: and it evaluates the idle state). Other system interference 240, the wireless communication system 100 is an interference to the wireless communication system 100 according to the radio signals transmitted from the different wireless communication systems. In this case, the terminal 120 does not transmit the uplink data to the base station 110 by the first candidate 221, and transmits uplink data to the base station 110 by the second candidate 222. [0038] 　Further, as an example different from the example shown in FIG. 2, the terminal 120 determines that vacant for the first candidate 221, if the second candidate 222 determines that busy, the base station 110 by the first candidate 221 to the transmit the uplink data. The terminal 120, when it is determined that vacant for both of the first candidate 221 and the second candidate 222, and transmits uplink data to the base station 110 by the first candidate 221 has a higher priority than the second candidate 222. When it is determined that the busy for both the first candidate 221 and the second candidate 222, the terminal 120 does not transmit the uplink data to the base station 110. [0039] 　In the example shown in FIG. 2, has been described to use the license Dobando the transmission control CH210 from base station 110 to the terminal 120, may be used unlicensed Dobando the transmission control CH210. [0040] (Base station) 　FIG. 3A is a diagram illustrating an example of a base station. Figure 3B is a diagram showing an example of a flow of signals in a base station shown in FIG. 3A. Figure 3A, as shown in FIG. 3B, the base station 110, for example, an antenna 301, a reception processing section 302, a data signal processing unit 303, a control unit 304, a scheduler 305, a control CH generating unit 306, It comprises a transmission processing unit 307, an antenna 308, a. [0041] 　Antenna 301 receives a radio signal transmitted from the terminal (e.g., terminal 120), and outputs the received signal to the reception processing unit 302. The reception processing unit 302 performs reception processing of signals output from the antenna 301. The reception processing by the reception processing unit 302, for example, amplification, RF: frequency conversion from (Radio Frequency RF) band to a baseband band, and the like conversion from an analog signal to a digital signal. The reception processing unit 302 outputs the signal subjected to reception processing to the data signal processing section 303. [0042] 　Data signal processing unit 303, based on the scheduling result of the uplink that is output from the scheduler 305, performs data signal processing of the signal output from the reception processing unit 302. A data signal processing by the data signal processing unit 303 includes, for example, demodulation and decoding. For example, the data signal processing section 303 performs data signal processing attempt to decode the plurality of candidates of resources used Unlicensed Dobando allocated to one terminal for uplink. Data signal processing section 303 outputs the data obtained by the data signal processing to the control unit 304. [0043] 　Control unit 304 performs various controls relating to communication by the base station 110. For example, the control unit 304 controls the scheduler 305 and the control CH generating unit 306. Control of the scheduler 305 and the control CH generating unit 306 by the control unit 304 may be performed based on the control information for example included in the output data from the data signal processing section 303. [0044] 　The scheduler 305 performs according to control of the control unit 304, and the downlink scheduling to the terminal from the base station 110 (e.g., terminal 120), and scheduling uplink from the terminal (e.g., terminal 120) to the base station 110, the . The uplink scheduling by the scheduler 305, to one terminal includes scheduling for allocating a plurality of candidate resources used for Unlicensed Dobando. The scheduler 305 outputs the scheduling result of the downlink and uplink to the control CH generating unit 306. The scheduler 305 outputs the scheduling result of the uplink to the data signal processing section 303. [0045] 　Control CH generating unit 306 generates the control of the control unit 304, a scheduling result output from the scheduler 305, the control CH of a downlink based on. The control CH to control CH generating unit 306 generates includes information for specifying a plurality of candidates of resources used Unlicensed Dobando assigned to the terminal. Control CH generating unit 306 outputs the generated control CH to the transmission processing unit 307. [0046] 　The transmission processing unit 307 performs transmission processing of the output control CH from the control CH generating unit 306. The transmission processing by the transmission processing unit 307, for example, conversion from a digital signal to an analog signal, a frequency conversion to the RF band from the baseband includes amplification and the like. Transmission processing unit 307 outputs the signal subjected to transmission processing to the antenna 308. Antenna 308 wirelessly transmits a signal output from the transmission processing unit 307 to the terminal (e.g., terminal 120). [0047] 　Figure 1A, allocation section 111 of base station 110 shown in FIG. 1B, for example a scheduler 305, control CH generating unit 306 can be realized by the transmission processing unit 307 and the antenna 308. Figure 1A, the receiving portion 112 of the base station 110 shown in FIG. 1B, can be realized by, for example, antenna 301, reception processing unit 302 and the data signal processing section 303. [0048] 　Figure 3C is a diagram illustrating an example of a hardware configuration of the base station. Figure 3A, the base station 110 shown in FIG. 3B may be realized by the communication device 330 shown in FIG. 3C, for example. Communication device 330 includes a CPU 331, a memory 332, a wireless communication interface 333, a wired communication interface 334, a. CPU 331, memory 332, a wireless communication interface 333 and the wired communication interface 334 is connected by a bus 339. [0049] 　CPU331 (Central Processing Unit) controls the entire communication device 330. The memory 332 includes a main memory and an auxiliary memory, for example. The main memory is, for example, RAM (Random Access Memory). The main memory is used as a work area of ​​the CPU 331. Auxiliary memory, for example a magnetic disk, an optical disk, a nonvolatile memory such as flash memory. The auxiliary memory, various programs for operating the communication apparatus 330 is stored. Program stored in the auxiliary memory is executed by CPU331 is loaded into the main memory. [0050] 　Wireless communication interface 333 is a communication interface for performing communication with an external communication device 330 by wireless (e.g. terminal 120). Wireless communication interface 333 is controlled by the CPU 331. [0051] 　Wired communication interface 334 is a communication interface for performing communication with an external communication device 330 via wired (e.g. the core network of the upper base station 110). Wired communication interface 334 is controlled by the CPU 331. [0052] 　Figure 3A, the antenna 301 shown in FIG. 3B, the reception processing unit 302, transmission processing unit 307 and the antenna 308, for example, can be implemented as a wireless communication interface 333. Figure 3A, the data signal processing section 303 shown in FIG. 3B, the control unit 304, a scheduler 305 and a control CH generating unit 306 may be realized by, for example, CPU 331. [0053] (Terminal) 　FIG. 4A is a diagram illustrating an example of a terminal. Figure 4B is a diagram illustrating an example of a signal flow in the terminal shown in FIG. 4A. Figure 4A, as shown in FIG. 4B, the terminal 120 is, for example, an antenna 401, a downlink signal reception processing unit 402, a control CH processing part 403, an antenna 404, an uplink signal reception processing section 405, availability detector It includes a section 406, a. The terminal 120 includes a control unit 407, a data signal generating unit 408, a transmission processing unit 409, an antenna 410, a. [0054] 　Antenna 401 receives a radio signal transmitted from another communication apparatus (e.g. base station 110), and outputs the received signal to a downlink signal reception processing section 402. Downlink signal reception processing unit 402 performs reception processing of the downlink signal from the base station 110 included in the signal output from the antenna 401. The reception processing by the downlink signal reception processing unit 402, for example, amplification, frequency conversion from the RF band to the baseband, and the like conversion from an analog signal to a digital signal. Downlink signal reception processing unit 402 outputs a downlink signal subjected to reception processing to the control CH processing part 403. [0055] 　Control CH processing part 403 performs processing of the control CH contained in the downlink signal output from the downlink signal reception processing section 402. The processing of the control CH of the control CH processing part 403 includes, for example, demodulation and decoding of the control CH. Control CH processing part 403 outputs a control CH obtained by the processing of the control CH to the control unit 407. [0056] 　The control CH processing part 403 included in the control CH obtained by processing of the control CH, availability detector information representing a plurality of candidates of resources used Unlicensed Dobando allocated to uplink transmission of the terminal 120 to output to 406. [0057] 　Antenna 404 receives a radio signal transmitted from another communication device (e.g. another terminal), and outputs the received signal to the uplink signal reception processing section 405. Uplink signal reception processing unit 405 performs reception processing of the uplink signal included in the signal output from the antenna 404. The reception processing by the uplink signal reception processing unit 405, for example, amplification, frequency conversion from the RF band to the baseband, and the like conversion from an analog signal to a digital signal. Uplink signal reception processing unit 405 outputs the uplink signal subjected to reception processing to availability detection unit 406. [0058] 　Availability detection unit 406, based on the uplink signal output from the uplink signal reception processing unit 405 performs carrier sense to detect the availability of bandwidth of the uplink. Moreover, availability detection unit 406, based on the information output from the control CH processing part 403, availability as target band including a plurality of candidates of resources used Unlicensed Dobando allocated to uplink transmission of the terminal 120 to detect. Availability detection unit 406 outputs the detection result of the availability of bandwidth of the uplink to the control unit 407 and the data signal generating unit 408. [0059] 　For example, availability detection unit 406 detects a radio signal in the target band. Detection of the radio signal in the band of interest, for example, to detect the radio wave received power (reception energy) of the target band, a process for detecting a radio signal by comparing the detected reception power and the predetermined power. Or detection of radio signals in the band of interest can be a process for detecting a radio signal by detecting a predetermined pattern of a radio signal (e.g., preamble) based on the radio wave in the band of interest. [0060] 　As an example, the detection by the availability detection unit 406, CSMA / CA: can be used carrier sense (Carrier Sense Multiple Access / Collision Avoidance carrier sense multiple access / collision avoidance). [0061] 　Control unit 407 performs various controls relating to communication by the terminal 120. For example, the control unit 407 controls the data signal generation section 408. Control of the data signal generating unit 408 by the control unit 407, for example, the control CH output from the control CH processing part 403 may be performed based on the detection result output from the availability detection unit 406 to the control unit 407 . [0062] 　Data signal generating unit 408, a control of the control unit 407, a detection result output from the availability detection unit 406, generates an uplink data signal based on the. For example, the data signal generating unit 408, for uplink transmission by unlicensed Dobando, so that availability detection unit 406 among the plurality of candidates of using resources allocated to uplink transmission of the terminal 120 transmits the candidate is determined that vacant It generates an uplink data signal. Data signal generating unit 408 outputs the generated data signal to the transmission processing unit 409. [0063] 　The transmission processing unit 409 performs transmission processing of the output from the data signal generating unit 408 data signals. The transmission processing by the transmission processing unit 409, for example, conversion from a digital signal to an analog signal, a frequency conversion to the RF band from the baseband includes amplification and the like. The transmission processing unit 409 outputs the signal subjected to transmission processing to the antenna 410. Antenna 410 wirelessly transmits a signal output from the transmission processing unit 409 to the base station (eg, base station 110). [0064] 　Figure 1A, implemented by the detection unit 121, for example an antenna 401, a downlink signal reception processing section 402, control CH processing unit 403, an antenna 404, an uplink signal reception processing section 405 and the availability detection unit 406 of the terminal 120 shown in FIG. 1B can do. Figure 1A, the transmission unit 122 of the terminal 120 shown in FIG. 1B, for example, the data signal generating unit 408 can be realized by the transmission processing unit 409 and the antenna 410. [0065] 　Figure 4C is a diagram showing an example of a hardware configuration of the terminal. Figure 4A, the terminal 120 shown in Figure 4B, can be realized by the communication device 430 shown in FIG. 4C, for example. Communication device 430 includes a CPU 431, a memory 432, a user interface 433, a wireless communication interface 434, a. CPU 431, memory 432, user interface 433 and a wireless communication interface 434 is connected by a bus 439. [0066] 　CPU431 controls the entire communication device 430. The memory 432 includes main memory and auxiliary memory, for example. The main memory is, for example, RAM. The main memory is used as a work area of ​​the CPU 431. Auxiliary memory, such as a magnetic disk, a nonvolatile memory such as flash memory. The auxiliary memory, various programs for operating the communication apparatus 430 is stored. Program stored in the auxiliary memory is executed by CPU431 is loaded into the main memory. [0067] 　The user interface 433 includes, for example, and input devices for accepting an operation input from a user, and an output device for outputting information to the user. Input devices, for example, can be implemented by a key (e.g., a keyboard) or a remote controller. Output device can be implemented by, for example, a display or a speaker. It is also possible to achieve input and output devices, such as by a touch panel. The user interface 433 is controlled by the CPU 431. [0068] 　Wireless communication interface 434 is a communication interface for performing communication with an external communication device 430 by wireless (e.g. base station 110 or another terminal). Wireless communication interface 434 is controlled by the CPU 431. [0069] 　Figure 4A, the antenna 401 shown in FIG. 4B, the downlink signal reception processing section 402, antenna 404, uplink signal reception processing unit 405, transmission processing unit 409 and the antenna 410, for example can be implemented by a wireless communication interface 434. Figure 4A, the control CH processing part 403 shown in FIG. 4B, availability detection unit 406, the control unit 407 and the data signal generating unit 408, for example, can be implemented by CPU 431. [0070] (Such processing by the base station in the first embodiment) 　FIG. 5 is a flowchart illustrating an example of processing by the base station according to the first embodiment. Base station 110 according to the first embodiment executes the steps shown in FIG. 5, for example. First, the base station 110 generates a control CH on the basis of the scheduling result for the terminal 120 (step S501). Control CH generated by step S501 is a control CH to specify the first candidate and second candidate resources used for transmitting the uplink data from terminal 120 to base station 110. [0071] 　Then, the base station 110 transmits the control CH generated in step S501 to the terminal 120 (step S502). Then, the base station 110 performs the receiving process of the first candidate specified by the transmitted control CH in step S502 (step S503). For example, base station 110 attempts to decode the radio signal in the radio resource corresponding to the first candidate. Then, the base station 110 in the reception processing in step S503, decides whether the successfully decoded the uplink data from the terminal 120 in the first candidate (step S504). [0072] 　In step S504, when successfully decoded (step S504: Yes), the base station 110 transmits ACK (acknowledgment) to the terminal 120 (step S505), the flow returns to step S501. If not successfully decoded (Step S504: No), the base station 110 performs the receiving process for the second candidate specified by the transmitted control CH in step S502 (step S506). For example, base station 110 attempts to decode the radio signal in the radio resource corresponding to the second candidate. [0073] 　Then, the base station 110 in the reception processing in step S506, decides whether the successfully decoded the uplink data from the terminal 120 in the second candidate (step S507). If successfully decoded (step S507: Yes), the base station 110 transmits an ACK to the terminal 120 (step S508), the flow returns to step S501. If not successfully decoded (Step S507: No), the base station 110 sends a NACK (negative acknowledgment) to the terminal 120 (step S509), the flow returns to step S501. [0074] 　The base station 110, after collectively performed reception processing of the reception process and the second candidate for the first candidate, also determine whether the successfully decoded the uplink data from the terminal 120 by the first candidate good. For example, base station 110, the step S506 may be performed between steps S503 and step S504. It is also a process for omitting the transmission of the NACK by step S505, ACK sent and step S509 in by S508. [0075] (Such processing by the terminal in the first embodiment) 　FIG 6 is a flowchart illustrating an example of processing by the terminal according to the first embodiment. Terminal 120 according to the first embodiment executes the steps shown in FIG. 6, for example. First, the terminal 120 performs reception processing of the control CH from the base station 110 (step S601). Then, the terminal 120 based on the result of the receiving process by the step S601, it is determined whether the detected control CH addressed to its own terminal from the base station 110 (step S602). [0076] 　In step S602, if not detect a control CH addressed to its own terminal (step S602: No), the terminal 120 returns to step S601. When detecting a control CH addressed to its own terminal (step S602: Yes), the terminal 120 detects the availability of channels for each candidate of the use resource control CH addressed to its own terminal is detected is specified (step S603 ). [0077] 　Then, the terminal 120 based on the detection result of the step S603, the first candidate is determined whether empty (step S604). If the first candidate is empty (step S604: Yes), the terminal 120, the first candidate transmit uplink data to the base station 110 (step S605), the flow returns to step S601. [0078] 　In step S604, the case where the first candidate is not empty (step S604: No), the terminal 120, based on the detection result of the step S603, the second candidate to determine whether the empty (step S606). If the second candidate is empty (step S606: Yes), the terminal 120, the second candidate transmit uplink data to the base station 110 (step S607), the flow returns to step S601. If the second candidate is not empty (step S606: No), the terminal 120 returns to step S601 without transmitting the uplink data to the base station 110. [0079] (Modification of the process by the base station according to the first embodiment) 　FIG. 7 is a flowchart showing a modification of the processing by the base station according to the first embodiment. Although in Figure 5 it has been described a case where specify two candidates use resources of the uplink (first candidate and second candidate) will be described in a case of specifying the N candidate resources used for the uplink in Figure 7 . N is for example an integer of 3 or more. [0080] 　First, the base station 110 generates a control CH on the basis of the scheduling result for the terminal 120 (step S701). Control CH generated by step S701 is a control CH to specify the first to N candidate resources used for transmitting the uplink data from terminal 120 to base station 110. [0081] 　Then, the base station 110 transmits the control CH generated in step S701 to the terminal 120 (step S702). Then, the base station 110 initializes the n (n = 1) (step S703). n is the index of each candidate using resources specified by the transmitted control CH in step S702 (1 ~ N). [0082] 　Then, the base station 110 performs the receiving process of the n candidate specified by the transmitted control CH in step S702 (step S704). For example, base station 110 attempts to decode the radio signal in the radio resource corresponding to the n candidates. Then, the base station 110 in the reception processing in step S704, decides whether the successfully decoded the uplink data from the terminal 120 at the n-th candidate (step S705). [0083] 　In step S705, the case of successful decoding (Step S705: Yes), the base station 110 transmits an ACK to the terminal 120 (step S706), the flow returns to step S701. If not successfully decoded (Step S705: No), the base station 110, n determines whether less than N (step S707). N is the maximum value of n. [0084] 　In step S707, the n is less than N (step S707: Yes), the base station 110, the n is incremented (n = n + 1) (step S 708), the flow returns to step S704. If n is greater than or equal to N (step S707: No), the base station 110 transmits a NACK to the terminal 120 (step S709), the flow returns to step S701. [0085] 　The base station 110, after collectively performed each receiving process of the first candidate to N-th candidate, in order from the first candidate, also determine whether the successfully decoded the uplink data from the terminal 120 good. It is also a process for omitting the transmission of the NACK by transmitting and step S709 of ACK by step S706. [0086] (Modification of the process by the terminal according to the first embodiment) 　FIG. 8 is a flowchart showing a modification of the process by the terminal according to the first embodiment. Although in Figure 6 it has been described a case where specify two candidates use resources of the uplink (first candidate and second candidate) will be described in a case of specifying the N candidate resources used for the uplink in Figure 8 . Step S801 ~ S803 shown in FIG. 8 is the same as step S601 ~ S603 shown in FIG. [0087] 　The next step S803, the terminal 120 initializes the n (n = 1) (step S804). n is the index of each candidate designated by the received control CH in step S801 (1 ~ N). Then, the terminal 120 based on the detection result of the step S803, the n candidate designated judges whether vacant by the received control CH in step S801 (step S805). If the n-th candidate is empty (step S805: Yes), the terminal 120, the n-th candidate and transmits uplink data to the base station 110 (step S806), the flow returns to step S801. [0088] 　In step S805, the case the n candidates is not empty (step S805: No), the terminal 120, n determines whether less than N (step S807). N is the maximum value of n. If n is less than N (step S807: Yes), the terminal 120, the n is incremented (n = n + 1) (step S808), the flow returns to step S805. If n is greater than or equal to N (step S807: No), the terminal 120 without transmitting the uplink data to the base station 110 returns to step S801. [0089] 　Thus, according to the first embodiment, it is possible to base station 110 allocates a plurality of candidate radio resource Unlicensed Dobando the terminal 120. Further, the terminal 120 performs carrier sense on the basis of the allocation result from the base station 110 can transmit an uplink signal by radio resource vacant ones of a plurality of assigned candidates. [0090] 　Thus, in the unlicensed Dobando shared with other wireless communication systems, a radio signal from the terminal 120 by the radio resource by the base station 110 is assigned to the base station 110, it can not be transmitted by interference from other radio communication system the possibility is low. Therefore, increasing the success rate of transmission of a radio signal from the terminal 120 to the base station 110, it is possible to improve the throughput. [0091] (Embodiment 2) 　for the second embodiment will be described differences from the first exemplary embodiment. In the second embodiment, the case where the base station 110 allocates resources used for a plurality of terminals 120 (e.g., users 1 to 3). [0092] (Uplink communication in a wireless communication system according to the second embodiment) 　FIG. 9 is a diagram illustrating an example of an uplink communication in a wireless communication system according to the second embodiment. 9, the horizontal axis represents time (subframe), the vertical axis represents the frequency. Downlink license Dobando the vertical axis is the band used by the base station 110 of the license Dobando to radio transmission to the terminal 120. Uplink unlicensed resources 1-4 Dobando the vertical axis is the radio resources included in the unlicensed Dobando. [0093] 　Each user 1-3, for example FIG. 4A, can be applied to the terminal 120 shown in Figure 4B. Resource 1-3 is a radio resource by the base station 110 is set as the first candidate of the resources used for transmission of uplink data of users 1 to 3, respectively. Resource 4 is a radio resource by the base station 110 is set as the second candidate of the resources used for transmission of uplink data of the user 1-3. [0094] 　Thus, in the second embodiment, the base station 110 sets the second candidate of the resources used for transmission of uplink data of a plurality of terminals in the same radio resource. In the example shown in FIG. 9, the base station 110 sets the four resource three resource first candidate (Resource 1-3) each user 1-3 of (resource 1-4) of Unlicensed Dobando It is set as a common second candidate the remaining resource 4 to the user 1-3. [0095] 　User 1-3, when the first candidate which is respectively set to the own terminal is not empty, sends the uplink data by the second candidate. The user 1-3, when transmitting the uplink data by the second candidate (Resource 4), the back-off process only when the channel resource 4 was empty at the time the back-off time has expired It transmits uplink data. [0096] 　Each back-off time of the user 1-3 is notified is set by the base station 110 to be different each to the user 1-3. Or, each back-off time of the user 1-3, the user 1-3 respectively may be set to the radio terminal based on a random number. [0097] 　Control CH911 ~ 913 is a control CH to the base station 110 transmits the downlink license Dobando to a plurality of terminals (users 1-3). In the example shown in FIG. 9, the control CH911 ~ 913 are transmitted at the beginning of the subframe SF1. [0098] 　Control CH911 includes information specifying a first candidate from the user 1 uses resource transmission of uplink data to the base station 110 (Resource 1) and the second candidate (resource 4). Control CH912 includes information specifying a first candidate from the user 2 to use the resource of the transmission of the uplink data to the base station 110 (Resource 2) and the second candidate (resource 4). Control CH913 includes information specifying a first candidate from the user 3 uses resource transmission of the uplink data to the base station 110 (resource 3) and the second candidate (resource 4). [0099] 　Time domain resources 1-4, for example, sub-frame SF5 after 4 sub-frame of the sub-frame SF1 to control CH911 ~ 913 has been sent. [0100] 　The user 1, based on the control CH911, in subframe SF4 of the immediately preceding sub-frame SF5, performs carrier sense in a band including the first candidate of using resources (resource 1). In the example shown in FIG. 9, the user 1, the first candidate (resource 1), and it was determined to be busy with other systems interference 921. [0101] 　In this case, the user 1, waits a back-off period 931 corresponding to the user 1 performs carrier sense of the resource 4 in the back-off period 931. In the example shown in FIG. 9, since the resource 4 were free in backoff period 931, the user 1 transmits a dummy signal 941 (dummy) by the resource 4 to the beginning of the subframe SF5. Then, the user 1, the uplink data 951 of the user 1 (user 1 data) and transmits the resource 4 in subframe SF5. [0102] 　User 2, on the basis of the control CH912, in subframe SF4 of the immediately preceding sub-frame SF5, performs carrier sense in a band including the first candidate of using resources (resource 2). In the example shown in FIG. 9, the user 2, the first candidate (resource 2) is determined to be busy with other systems interference 922. In this case, user 2, waits a back-off period 932 corresponding to the user 2, carrier sensing of the resource 4 in the back-off period 932. In the example shown in FIG. 9, since the resource 4 in the back-off period 932 is busy by the dummy signal 941 from the user 1, user 2 does not transmit the uplink data. [0103] 　User 3 on the basis of the control CH913, in subframe SF4 of the immediately preceding sub-frame SF5, performs carrier sense in a band including the first candidate of using resources (resource 3). In the example shown in FIG. 9, the user 3, the first candidate (resource 3) and determined to be empty. In this case, the user 3 transmits the dummy signal 942 (dummy) by beginning to resource 3 subframe SF5. Then, the user 3, the uplink data 952 of the user 3 (user 3 data) and transmits the resource 3 in subframe SF5. [0104] (Such processing by the base station to the second embodiment) 　FIG. 10 is a flowchart illustrating an example of processing by the base station according to the second embodiment. Base station 110 according to the second embodiment, performing the steps shown in FIG. 10 for example. 10, the case where communication between the base station 110 and the first to M terminal. M is, for example, an integer of 2 or more. First, the base station 110 performs a first candidate resource use resources in each of the first to M terminal, and resources common second candidate to the first to the M terminal, the selection (Step S1001) . [0105] 　Then, the base station 110 generates a control CH on first to M terminal (step S1002). Control CH produced by the step S1002 is based on the selection result by step S1001, the designating the first candidate and second candidate resources used for transmitting the uplink data to the base station 110 from the first to M terminal it is a control CH. Then, the base station 110 transmits the control CH generated in step S1002 to the first to the M addressed terminal (step S1003). [0106] 　Then, the base station 110 performs steps S1004, S1005 for each of the first to M terminal. First, the base station 110, the target terminal from among the first to M terminal performs reception processing of the first candidate specified by the transmitted control CH in step S1003 (step S1004). Then, the base station 110 identifies the success or failure of decoding of the uplink data from the target terminal in the first candidate in the receiving processing at Step S1004 (Step S1005). [0107] 　Then, the base station 110, based on the identification result of step S1005, for each of the terminals decrypting the uplink data in the first candidate is not successful, the order of priority, performs steps S1006, S1007. The order of preference, for example, the set back-off value (backoff time) is small (short) is a forward. [0108] 　First, the base station 110, the target terminal from among the first to M terminal performs the receiving process for the second candidate specified by the transmitted control CH in step S1003 (step S1006). Then, the base station 110 identifies the success or failure of decoding of the uplink data from the target terminal in the second candidate in the receiving processing at Step S1006 (Step S1007). When executing step S1006, S1007 for each of the target terminal, the base station 110 returns to step S1001. [0109] 　Has been described to specify two candidate resources used up (first candidate and second candidate) in FIG. 10, it may be a process of specifying the N candidate resources used in uplink. In this example shows an example of assigning a common second candidate to the first to the M terminal, the allocation of the second candidate may be allocated first to M terminal dispersed to a plurality of resources. [0110] (Such processing by the terminal in the second embodiment) 　FIG. 11 is a flowchart illustrating an example of processing by the terminal according to the second embodiment. Terminal 120 according to the second embodiment can be applied for example to each of the users 1 to 3 and the first to M terminal described above. Terminal 120 according to the second embodiment, performing the steps shown in FIG. 11 for example. Step S1101 ~ S1105 shown in FIG. 11 are similar to steps S601 ~ S605 shown in FIG. [0111] 　In step S1104, when the first candidate is not empty (step S1104: No), the terminal 120 waits a back-off time of the terminal performs a back-off process for performing carrier sense (step S1106), to step S1107 Transition. Step S1107, S1108 are similar to steps S606, S607 shown in FIG. 6. [0112] 　The terminal 120, in transmitting the uplink data in step S1105, S1108, if there is time to subframe for transmitting uplink data may be transmitted a dummy signal by the resource to transmit the uplink data. [0113] 　Has been described to specify two candidate resources used up (first candidate and second candidate) in FIG. 11, it may be a process of specifying the N candidate resources used in uplink. [0114] 　Thus, according to the second embodiment, it is possible to assign duplicate with are obtained the same effects as the first embodiment, each base station 110 of the plurality of terminals 120 of the same second candidate. Further, each of the plurality of terminals 120, a second candidate allocated by the base station 110, it is possible to perform an empty detection by different back-off time with each other. [0115] 　Thus, while improving the utilization efficiency of radio resources assigning identical second candidate to each of the plurality of terminals 120, it is possible to avoid collisions between a plurality of terminals 120 in the second candidate. [0116] (Embodiment 3) 　For Embodiment 3 will be described differences from the first exemplary embodiment. In the third embodiment, the case where the base station 110 allocates resources used for a plurality of terminals 120 (e.g., users 1 to 3). [0117] (Uplink communication in a wireless communication system according to the third embodiment) 　FIG. 12 is a diagram illustrating an example of an uplink communication in a wireless communication system according to the third embodiment. 12, its description is omitted with the same reference numerals similar to those depicted in FIG. [0118] 　Base station 110 according to the third embodiment allocates a plurality of resources allow overlapping to each terminal (user 1-3). Then, each terminal performs a backoff process for each resource, transmits uplink data to ensure resources free earlier could be detected. Reservation of resources may be performed by transmitting the dummy signal at for example the target resource. [0119] 　Further, each terminal backoff value is set for each resource. At this time, each resource, the backoff value is set different for each terminal. In each terminal, different back-off values ​​for each resource is set. Each backoff value of each terminal (backoff time) is notified is set by the base station 110 as respectively different to each terminal. Or, each back-off value for each terminal, respectively may be set to the own terminal based on the terminal random number. [0120] 　Control CH911 ~ 913 each include information specifying four candidate resources used for transmission of uplink data from users 1 to 3 to the base station 110. The control CH911 ~ 913 are both including information specifying the resources 1-4 as four candidate resources used. [0121] 　Backoff period from 1211 to 1214 is a backoff period based on the back-off value set for the resource 1-4 user 1, respectively. User 1, for resources 1, waits a back-off period 1211, performs carrier sense in backoff period 1211. Similarly, the user 1, the resources 2-4, waits a back-off period from 1212 to 1214, performs carrier sense in backoff period 1212-1214. [0122] 　Backoff period 1221-1224 are backoff period based on the back-off value set for the resource 1-4 user 2, respectively. User 2, the resources 1-4, waits a back-off period from 1221 to 1224, performs carrier sense in backoff period 1221-1224. [0123] 　Backoff period 1231-1234 are backoff period based on the back-off value set for the resource 1-4 user 3, respectively. User 3, the resources 1-4, waits a back-off period from 1231 to 1234, performs carrier sense in backoff period 1231-1234. [0124] 　In the example shown in FIG. 12, user 1, detected a vacant in backoff period 1211 in the resource 1, it transmits the dummy signal 1241 (User 1 dummy) and user data 1251 (User 1 data) by the resource 1. Then, the user 1, detected a vacant in the resource 1, as indicated by the shaded portion of the back-off period from 1212 to 1214, may not be performed subsequent back-off process in the resource 2-4. [0125] 　User 3, detected a vacant in backoff period 1234 in the resource 4, and transmits the dummy signal 1243 (the user 3 dummy) and the user data 1253 (User 3 data) by the resource 4. The user 3 is detected a vacant in the resource 4, as indicated by the shaded portion of the backoff period 1231-1233 may not perform the subsequent back-off process in the resource 1-3. [0126] 　User 2, since it is determined that the busy by other system interference 1261 with the back-off period 1223 in the resource 3, no data transmission by the resource 3. Also, user 2, since it is determined that the busy by the dummy signal 1243 from the user 3 in the back-off period 1224 in the resource 4, no data transmission by the resource 4. Also, user 2, since it is determined that the busy by the dummy signal 1241 from the user 1 in the back-off period 1221 in the resource 1, no data transmission by the resource 1. [0127] 　The user 2 has detected a vacant in backoff period 1222 in the resource 2, it transmits the dummy signal 1242 (User 2 dummy) and user data 1252 (User 2 data) by the resource 2. [0128] 　In the example shown in FIG. 12, the user data 1251 to 1253 are controlled CH911 ~ 913 are transmitted in the subframe SF5 after 4 subframes from a subframe SF1 is sent. Dummy signal 1241-1243 is transmitted in sub-frame SF4 of the immediately preceding subframe SF5. [0129] (Back-off value for each resource set in each terminal) 　FIG. 13 is a diagram showing an example of a back-off value for each resource set in each terminal. Each terminal (user 1-3), for example, back-off value for each resource, as shown in table 1300 of FIG. 13 (1-4) is set. As shown in table 1300, each resource, the backoff value is set different for each terminal. Further, as shown in table 1300, in each terminal, different back-off values for each resource is set. [0130] (Such processing by the base station to the third embodiment) 　FIG. 14 is a flowchart illustrating an example of processing by the base station according to the third embodiment. Base station 110 according to the third embodiment, performing the steps shown in FIG. 14 for example. 14, the case where communication between the base station 110 and the first to M terminal. M is, for example, an integer of 2 or more. First, the base station 110 sets a backoff value of each resource to each terminal (first to M terminal) (step S1401). [0131] 　Then, the base station 110 generates a control CH on first to M terminal (step S1402). Control CH produced by the step S1402 is a control CH to specify the resource 1-4, for example, as a candidate of the resources used. Then, the base station 110 transmits the control CH generated in step S1402 to the first to the M addressed terminal (step S1403). [0132] 　The back-off value set at step S1401 may be notified to each terminal by the control CH to send eg by step S1403. Or, the back-off value set at step S1401 may be notified to each terminal by a different signal from the control CH to transmit by step S1403. [0133] 　Then, the base station 110 initializes the k (k = 1) (step S1404). k is an index value backoff value can take (for example 1-4). Also, each back-off value and the first back-off value, second K backoff value, and the first back-off value