Entitled wireless communication system, a base station apparatus and a terminal device

Technical field

[0001]

　The present invention relates to a wireless communication system, a base station apparatus and a terminal device.

Background technique

[0002]

　Recently, in wireless communication systems such as cellular telephone systems, in order to further speed-up and large capacity or the like of the wireless communication, discussions have been conducted on the next generation wireless communication technology. For example, in a communication standard called LTE (Long Term Evolution), the carrier of the frequency band requires a license: a (LC Licensed Band Carrier), license unnecessary frequency band carriers: by using the (UC Unlicensed Band Carrier) communication It has been considered a technique for performing. The technique, called the LAA (Licensed Assisted Access).

[0003]

　In LAA, terminal device, when performing uplink transmission to the base station apparatus, the base station apparatus, a UL (Up Link) grant for requesting transmission of the data, and transmits to the terminal device via the license Dobando. Terminal device, when receiving the UL grant from the base station apparatus via the license Dobando executes LBT carrier sensing in unlicensed Dobando before transmission of the data (Listen Before Talk). When resources Unlicensed Dobando specified in UL grant is idle, the terminal apparatus transmits data to the base station apparatus using the resources of the unlicensed Dobando specified in UL grant.

CITATION

Non-patent literature

[0004]

非特許文献1 : R.　Ratasuk,　M.　Uusitalo,　N.　Mangalvedhe,　A.　Sorri,　S.　Iraji,　C.　Wijting　and　A.　Ghosh,　“License-Exempt　LTE　Deployment　in　Heterogeneous　Network”,　Proceeding　of　International　Symposium　on　Wireless　Communication　Systems　(ISWCS)　2012,　Aug.　2012.

Summary of the Invention

Problems that the Invention is to Solve

[0005]

　By the way, unlicensed Dobando is also used in other systems, such as other LTE operators and wireless LAN. Therefore, the terminal apparatus when performing the transmission of data, resources Unlicensed Dobando specified in UL grant received from the base station apparatus are not necessarily idle. Therefore, during resource Unlicensed Dobando specified in UL grant received from the base station apparatus is busy, the terminal apparatus does not transmit the data. Thus, the throughput of data in the uplink to the base station apparatus is lowered from the terminal device.

[0006]

　In one aspect, the present invention relates to a wireless communication system that can improve a decrease in throughput in the uplink, to provide a base station apparatus and a terminal device.

Means for Solving the Problems

[0007]

　Wireless communication system disclosed in the present application, in one embodiment, has a first communication apparatus and a plurality of second communication devices, a first communication device, a plurality of second communication apparatuses, the own wireless communication using the shared bandwidth to be shared with the system dedicated dedicated band and other systems. The first communication device includes a first transmission unit for transmitting control information instructing the resource in the shared band for transmitting data, to the second communication device using the resources in the dedicated band. Each of the second communication apparatus includes a determination unit, and a second transmission unit. Determination unit determines which one resource in shared bandwidth is idle or busy. The second transmission unit, when the resource in the shared band is idle, after transmitting a predetermined signal indicating the start of transmission of data to the shared band, using the resources of indicated in a shared band control information to send the data. The second transmission unit, when receiving a predetermined signal from another second communication apparatus, even if the resources in the shared bandwidth is busy, shared bandwidth instructed by the control information It transmits data by using resources within.

Effect of the Invention

[0008]

　According to one aspect of the present invention, it is possible to improve a decrease in throughput in the uplink.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009]

[1] Figure 1 is a diagram illustrating an example of a wireless communication system.
FIG. 2 is a block diagram illustrating an example of a base station apparatus in Embodiment 1.
FIG. 3 is a block diagram illustrating an example of a terminal apparatus according to the first embodiment.
[4] FIG. 4 is a diagram showing an example of the operation of the wireless communication system in the first embodiment.
FIG. 5 is a flowchart showing an example of the operation of the base station apparatus in Embodiment 1.
FIG. 6 is a flow chart showing an example of the operation of the terminal device in the first embodiment.
[7] FIG. 7 is a diagram showing an example of the operation of the wireless communication system according to the second embodiment.
[8] FIG. 8 is a diagram showing an example of the operation of the wireless communication system in the third embodiment.
[9] FIG. 9 is a diagram showing an example of the operation of the wireless communication system in the third embodiment.
[10] FIG 10 is a flowchart showing an example of the operation of the base station apparatus in Embodiment 3.
[11] FIG 11 is a flowchart showing an example of operation of the terminal apparatus in Embodiment 3.
[12] FIG 12 is a block diagram illustrating an example of a base station apparatus in Embodiment 4.
[13] FIG 13 is a diagram showing an example of the operation of the wireless communication system in the fourth embodiment.
[14] FIG 14 is a flowchart showing an example of the operation of the base station apparatus in Embodiment 4.
[15] FIG 15 is a flowchart showing an example of operation of the terminal apparatus in Embodiment 4.
[16] FIG 16 is a diagram illustrating an example of a wireless communication device that implements the functions of the base station apparatus or terminal apparatus.

DESCRIPTION OF THE INVENTION

[0010]

　Hereinafter, a radio communication system disclosed in the present application, an embodiment of a base station apparatus and the terminal apparatus will be described in detail with reference to the drawings. The following examples are not intended to limit the disclosed technique. Further, each embodiment can be combined as appropriate within a range that does not contradict the processing contents.
Example 1

[0011]

[Wireless Communication System 10]
　FIG. 1 is a diagram illustrating an example of a wireless communication system 10. Wireless communication system 10 includes base station apparatus 20, base station apparatus 22, the terminal apparatus 30a, and the terminal device 30b. In the following, described as the terminal device 30 may be collectively without distinguishing each of the terminal devices 30a and terminal 30b.

[0012]

　The base station apparatus 20, for example, performs wireless communication based on LTE. The base station apparatus 20 is eNB (evolved Node B) for example in LTE. Each terminal device 30 is, for example, a UE in LTE (User Equipment). Terminal 30a and the terminal device 30b is the base station apparatus 20 belong to the same cell managed, it communicates with the base station device 20 within the cell. In the following description, it may be described a base station apparatus 20 and the terminal device 30 and the LTE system. The base station apparatus 20 is an example of a first communication device, terminal device 30 is an example of a second communication device.

[0013]

　The base station apparatus 22 is a base station apparatus belonging to a different system than the example LTE system the base station apparatus 20 belongs. The base station device 22, for example, the base station apparatus base station apparatus belonging to LTE systems of different operators 20 and belongs LTE system, or a base station apparatus belonging to another communication system such as a wireless LAN system.

[0014]

　The base station device 20 uses a first band of the LTE system dedicated base station apparatus 20 belongs, a second band which the base station device 20 is shared between the LTE system and other systems belonging, within the cell performing of the terminal device 30 and wireless communication. First band is a band in which radio communication is performed using, for example, a 2GHz band LC (Licensed band Carrier). Second band is a band in which radio communication is performed using e.g. 5GHz band UC the (Unlicensed band Carrier). Hereinafter, a first band license Dobando, the second band is referred to as unlicensed Dobando.

[0015]

　In the LTE system where the base station device 20 belongs, the first band, for example, assigned to the PCC (Primary Component Carrier), a second band, for example, assigned to the SCC (Secondary Component Carrier). In this embodiment, the first band is the base station device 20 is a dedicated band of the LTE system belong, second band, the LTE system the base station apparatus 20 belongs, and a system in which the base station apparatus 22 belongs in a shared bandwidth to be shared.

[0016]

　Further, in FIG. 1, reference numeral 21, the radio wave transmitted from an arbitrary device, showing the area to arrive in intensity is determined to be busy by carrier sensing of the terminal device 30a. Further, reference numeral 23, the radio wave transmitted from an arbitrary device, showing the area to arrive in intensity is determined to be busy by carrier sensing of the terminal device 30b.

[0017]

　When the terminal apparatus 30 performs transmission of data at an unlicensed Dobando, the base station apparatus 20 transmits a UL grant to the terminal device 30 in the license Dobando. Terminal 30 which has received the UL grant, to perform the LBT in unlicensed Dobando. When the unlicensed Dobando is determined to be idle, the terminal device 30, transmitting data using resources of unlicensed Dobando specified in UL grant.

[0018]

　Here, in the example of FIG. 1, the unlicensed Dobando, the base station device 20 is not transmitting a radio wave, when the base station apparatus 22 is transmitting a radio wave, the terminal device 30a, the carrier sense result, unlicensed Dobando it is determined to be idle. Therefore, if the base station apparatus 20 has not transmitted the radio wave in the unlicensed Dobando, the terminal apparatus 30a performs transmission of data by using the resource of the specified unlicensed Dobando in UL grant received from the base station apparatus 20 be able to.

[0019]

　On the other hand, it is determined in the example shown in FIG. 1, the terminal device 30b, when the base station apparatus 22 is transmitting a radio wave in unlicensed Dobando, carrier sense result, the unlicensed Dobando is busy. If unlicensed Dobando performs only transmission of data in a Unlicensed Dobando when it is idle, while the base station apparatus 22 is transmitting a radio wave in unlicensed Dobando, the terminal device 30b is the transmission of data Not performed. Therefore, the throughput of data is reduced in the uplink to the base station device 20 from the terminal device 30b.

[0020]

　In the wireless communication system 10 of this embodiment contrast, when the same cells belonging either terminal device 30 is determined to be the unlicensed Dobando idle by carrier sense, the terminal device 30 is the start of transmission of data transmitting a predetermined signal indicating. In the present embodiment, the predetermined signal is, for example CTS (Clear To Send) signal. Then, after the transmission of the CTS signal, the terminal apparatus 30 starts transmission of data in Unlicensed Dobando.

[0021]

　On the other hand, the terminal device 30 other terminals 30 which has received the CTS signal from belonging to the same cell, even when the unlicensed Dobando through the carrier sense is determined to be busy, the transmission of data in Unlicensed Dobando Start. Thus, it is possible to improve a decrease in throughput of data in the uplink of the terminal device 30.

[0022]

　Here, the same cell two terminal devices belonging to 30 consider a case where the transmission of data. One terminal 30 detects the idle unlicensed Dobando through the carrier sense, when starting the transmission of data, the other terminal device 30 determines the unlicensed Dobando busy by radio waves from one of the terminal device 30. Thus, the other terminal device 30, transmission of one of the terminal device 30 until the end to postpone transmission of data.

[0023]

　Here, unlicensed Dobando is divided into a plurality of sub-bands, the base station apparatus 20, for each of the terminal devices 30 under, assigning different sub-bands. Then, the base station apparatus 20, a signal transmitted from the terminal device 30 in the different subbands, demodulates and decodes separated for each sub-band. Therefore, a plurality of terminal devices 30 belonging to the same cell, by performing each transmission using the resources of the unlicensed Dobando instructed from the base station apparatus 20, base station apparatus 20, transmitted from each terminal device 30 it is possible demodulation and decoding of signals.

[0024]

　However, as shown in FIG. 1, the terminal device 30, the radio waves from the base station apparatus 22 belonging to the different systems, when it is determined unlicensed Dobando busy and, when a transmission in unlicensed Dobando, the base station apparatus there is a case in which affect the reception operation of 22. Therefore, the terminal device 30 that unlicensed Dobando is determined to be busy, transmission power if, the influence on the receiving operation of the base station device 22 is controlled to be lowered to transmit the data by the reception of the CTS signal, data carry out the transmission. Thus, it is possible to reduce the influence on the receiving operation of other systems is transmitting and receiving at the unlicensed Dobando.

[0025]

[Base station apparatus 20]
　FIG. 2 is a block diagram illustrating an example of a base station apparatus 20 in the first embodiment. The base station apparatus 20 includes a packet generation section 200, MAC (Media Access Control) scheduling section 201, MAC controller 202, RRC (Radio Resource Control) control unit 203 and the MAC · RLC (Radio Link Control) processing section 204, . Further, the base station apparatus 20, unlicensed Dobando transmitting unit 210, a license Dobando transmission unit 220, unlicensed Dobando receiver 230, the license Dobando receiver 240, antenna 216, antenna 226, antenna 235, and an antenna 245. The antenna 216, antenna 226, antenna 235, and antenna 245 may be implemented by a single antenna.

[0026]

　License Dobando receiver unit 240 performs processing to decode data from a signal received in the license Dobando. License Dobando receiver 240 includes a decoder 241, demodulator 242, FFT processing section 243 and the wireless processing unit 244,.

[0027]

　The radio processing section 244 performs radio processing signals received via the antenna 245. A wireless processing performed by the wireless processing unit 244, include, for example, processing for converting the frequency of the received signal from the license Dobando to baseband. The radio processing unit 244 outputs the received signal subjected to radio processing to FFT processing section 243.

[0028]

　FFT processor 243 performs an FFT (Fast Fourier Transform) processing on the received signal outputted from the radio processing unit 244. Thus, the received signal frequency-converted to baseband from the license Dobando is transformed from the time domain to the frequency domain. FFT processing section 243 outputs the received signal subjected to FFT processing to the demodulation unit 242.

[0029]

　Demodulation unit 242 demodulates the received signal outputted from the FFT processing unit 243. Then, demodulation unit 242 outputs the received signal after demodulation to decoding section 241. Decoding unit 241 decodes the received signal output from the demodulator 242. Then, the decoding unit 241 outputs the decoded data to the MAC · RLC processing section 204.

[0030]

　Unlicensed Dobando receiving unit 230 performs processing to decode data from a signal received at an unlicensed Dobando. Unlicensed Dobando receiver 230 includes a decoder 231, demodulator 232, FFT processor 233 and radio processor 234,.

[0031]

　The radio processing section 234 performs radio processing signals received via the antenna 235. The radio processing performed by the wireless processing unit 234, include, for example, processing for converting the frequency of the received signal from the unlicensed Dobando to baseband. The radio processing unit 234 outputs the received signal subjected to radio processing to the FFT processor 233.

[0032]

　FFT processor 233 performs FFT processing on the received signal outputted from the radio processing unit 234. Thus, the received signal frequency-converted to baseband from unlicensed Dobando is transformed from the time domain to the frequency domain. FFT processing section 233 outputs a received signal subjected to FFT processing to the demodulation unit 232.

[0033]

　Demodulation unit 232 demodulates the received signal outputted from the FFT processing unit 233. Then, demodulation unit 232 outputs the received signal after demodulation to decoding section 231. Decoding unit 231 decodes the received signal output from the demodulator 232. Then, the decoding unit 231 outputs the decoded data to the MAC · RLC processing section 204.

[0034]

　MAC · RLC processing unit 204 performs the processing in the processing and RLC layer in MAC layer based on the data output from the decoding unit 231 and the decoding unit 241. MAC · RLC processing section 204, the data obtained by the processing of each layer, and outputs to the device that performs for example processing of the upper layer of the base station apparatus 20. Further, MAC · RLC processing section 204 outputs the control information included in the data obtained by the processing of each layer to the RRC control unit 203. Further, MAC · RLC processing unit 204, if it contains the CTS signal output from unlicensed Dobando receiving unit 230 data, waits for data to be transmitted from the terminal device 30 in the unlicensed Dobando following the CTS signal .

[0035]

　RRC control unit 203 performs radio resource control on the basis of the control information output from the MAC · RLC processing section 204. Radio resource control performed by the RRC control unit 203 is a processing of the RRC layer. RRC control unit 203 generates control information based on a radio resource control, and outputs the generated control information to the MAC control unit 202.

[0036]

　MAC controller 202 controls the MAC layer based on the control information output from the RRC control unit 203. Further, MAC controller 202, when the transmission request of the data to the terminal device 30 has occurred, creating a UL grant for requesting transmission of the data. Then, MAC control unit 202, a UL grant that was created, and outputs to the multiplexing unit 223 to be described later. The UL grant, for example, the terminal device 30 is unlicensed Dobando subband to use when transmitting data, transmission start timing, the back-off value, includes information such as the minimum transmission power.

[0037]

　Further, MAC controller 202 generates a control signal including a signal including DMRS (Data Demodulation Reference Signal) on the basis of the control of the MAC layer, and outputs the generated control signal to the multiplexing unit 213 to be described later. Further, MAC controller 202 generates control information based on the control of the MAC layer, and outputs the generated control information to the MAC scheduling section 201.

[0038]

　Packet generation unit 200 generates a packet including the user data output from the device for processing the higher layer. The packet generation unit 200 outputs the generated packet to the MAC scheduling section 201.

[0039]

　MAC scheduling section 201 based on the control information output from the MAC control unit 202 performs scheduling in the MAC layer with respect to the packet output from the packet generation unit 200. Then, MAC scheduling section 201 outputs the packet to the unlicensed Dobando transmission section 210 or licensed Dobando transmission unit 220 based on the scheduling results. MAC scheduling section 201, for example, as the transmission of the data signal is performed in sub-frame units, it performs scheduling. That, MAC scheduling section 201, as the length of the data signal transmitted in the license Dobando matches the sub-frame period, for scheduling packets.

[0040]

　License Dobando transmitting unit 220 performs a process for transmitting data in a license Dobando. License Dobando transmission section 220 includes an encoding unit 221, modulation unit 222, multiplexing section 223, IFFT (Inverse Fast Fourier Transform) processing unit 224 and the wireless processing unit 225,.

[0041]

　Encoding unit 221 encodes the data of the packet output from the MAC scheduling section 201. The encoding unit 211 outputs the data of the encoded packet to the modulation section 222. Modulation unit 222 modulates the data output from the coding section 221. Then, modulation section 222, and outputs the modulated signal to multiplexing section 223.

[0042]

　Multiplexing section 223 multiplexes a signal of the control information UL grant or the like output from the MAC controller 202, and a signal output from the modulation unit 222. Then, multiplexing section 223 outputs the transmission signal multiplexed to the IFFT processing unit 224.

[0043]

　IFFT processor 224 performs IFFT processing on the transmission signal outputted from multiplexing section 223. Thus, the transmission signal output from the multiplexing section 223 is converted from the frequency domain to the time domain. IFFT processing section 224 outputs the transmission signal after IFFT processing to the radio processor 225.

[0044]

　The radio processing section 225 performs radio processing on the transmission signal outputted from the IFFT processing unit 224. The radio processing performed by the wireless processing unit 225, include, for example, processing for converting the frequency of the transmitted signal from the baseband to the license Dobando. The radio processing unit 225 transmits the transmission signal after radio processing from antenna 226.

[0045]

　The unlicensed Dobando transmitting unit 210 performs a process for transmitting data in a unlicensed Dobando. Unlicensed Dobando transmitting unit 210 has a coding section 211, modulation section 212, multiplexing section 213, IFFT processing section 214 and the wireless processing unit 215,.

[0046]

　Encoding unit 211 encodes the data of the packet output from the MAC scheduling section 201. The encoding unit 211 outputs the data of the encoded packet to the modulation section 212. Modulation unit 212 modulates the data of the packet output from the coding unit 211. Then, modulation section 212, and outputs the modulated signal to multiplexing section 213.

[0047]

　Multiplexing section 213 multiplexes a signal such as DMRS output from the MAC controller 202, and a signal output from the modulation unit 212. Then, multiplexing section 213 outputs a transmission signal multiplexed to the IFFT processing unit 214.

[0048]

　IFFT processor 214 performs IFFT processing on the transmission signal outputted from multiplexing section 213. Thus, the transmission signal output from the multiplexing section 213 is converted from the frequency domain to the time domain. IFFT processing section 214 outputs the transmission signal after IFFT processing to the wireless processing unit 215.

[0049]

　The radio processing unit 215, performs radio processing on the transmission signal outputted from the IFFT processing unit 214. The radio processing performed by the wireless processing unit 215, include, for example, processing for converting the frequency of the transmitted signal from the baseband to the unlicensed Dobando. The radio processing unit 215 transmits the transmission signal after radio processing from antenna 216.

[0050]

Terminal apparatus 30]
　FIG. 3 is a block diagram showing an example of the terminal device 30 according to the first embodiment. Terminal device 30, for example, as shown in FIG. 3, an antenna 300, decoding section 301, measuring section 302, judging section 303, RRC processing unit 304, MAC processing section 305, encoding and modulating unit 306 and the packet generation unit 307, having. The terminal device 30 includes a license Dobando receiver 310, unlicensed Dobando receiver 320, unlicensed Dobando transmitting unit 330 and the license Dobando transmitting unit 340.

[0051]

　The antenna 300, the license Dobando receiver 310, each of Unlicensed Dobando receiver 320, unlicensed Dobando transmitting unit 330, and the license Dobando transmission unit 340, may be provided separately. The antenna 300 is one license Dobando receiving unit 310 and the license Dobando transmitting unit 340 may be provided one for unlicensed Dobando receiving unit 320 and unlicensed Dobando transmitting unit 330.

[0052]

　License Dobando receiver 310 performs a process of demodulating the data from the signal received in the license Dobando. License Dobando receiver 310 includes a radio processing section 311, FFT processing section 312, the equalization processing section 313, IFFT section 314 and demodulation section 315,.

[0053]

　The radio processing section 311 performs radio processing on the signal received via the antenna 300. A wireless processing performed by the wireless processing unit 311, include, for example, processing for converting the frequency of the received signal from the license Dobando to baseband. The radio processing unit 311 outputs the received signal after radio processing to FFT processing section 312.

[0054]

　FFT processor 312 performs FFT processing on the received signal outputted from the radio processing unit 311. Thus, the received signal outputted from the radio processing unit 311 is transformed from the time domain to the frequency domain. FFT processing section 312 outputs the received signal after FFT processing to the equalization processing section 313. Equalizing processing section 313 performs equalization processing on the signal output from the FFT processor 312. The equalization processing section 313 outputs the received signal after the equalization processing to IFFT processing section 314.

[0055]

　IFFT processor 314 performs IFFT processing on the received signal outputted from the equalization processing unit 313. Thus, the received signal outputted from the equalization processing unit 313 is converted from the frequency domain to the time domain. IFFT processing section 314 outputs the received signal after the IFFT processing to demodulation section 315.

[0056]

　Demodulation unit 315 demodulates the received signal output from the IFFT processor 314. Then, demodulation unit 315 outputs the received signal after demodulation to decoding section 301. Note that the data decoded from the received signal demodulated by the license Dobando receiver 310 includes control information such as UL grant and CTS signals.

[0057]

　Unlicensed Dobando receiver 320 performs a process of demodulating the data from the signal received in the unlicensed Dobando. Unlicensed Dobando receiver 320 includes a radio processing section 321, FFT processing section 322, the equalization processing section 323, IFFT section 324 and demodulation section 325,.

[0058]

　The radio processing section 321 performs radio processing on the signal received via the antenna 300. The radio processing performed by the wireless processing unit 321, include, for example, processing for converting the frequency of the received signal from the unlicensed Dobando to baseband. The radio processing unit 321 outputs the received signal after radio processing to FFT processing section 322 and the measurement unit 302.

[0059]

　FFT processor 322 performs FFT processing on the received signal outputted from the radio processing unit 321. Thus, the received signal outputted from the radio processing unit 321 is transformed from the time domain to the frequency domain. Then, the FFT processing section 322 outputs the received signal after FFT processing to the equalization processing section 323. Equalizing processing section 323 performs equalization processing of received signals outputted from the FFT processing unit 322. The equalization processing section 323 outputs the received signal after the equalization processing to IFFT processing section 324.

[0060]

　IFFT processor 324 performs IFFT processing on the received signal outputted from the equalization processing unit 323. Thus, the received signal outputted from the equalization processing unit 323 is converted from the frequency domain to the time domain. IFFT processing section 324 outputs the received signal after the IFFT processing to demodulation section 325. Demodulation unit 325 demodulates the received signal outputted from the IFFT processing unit 324. Then, demodulation unit 325 outputs the received signal after demodulation to decoding section 301.

[0061]

　Decoding unit 301 decodes the user data and control information from the received signal outputted from the license Dobando receiver 310 and unlicensed Dobando receiver 320. Then, the decoding unit 301, the user data after decoding, and outputs for example the application processing unit that performs processing based on the received data (not shown). Further, the decoding unit 301, the control information after decoding, and outputs it to the RRC processing section 304. The control information output to the RRC processing section 304 includes a UL grant or CTS signal or the like.

[0062]

　RRC processing unit 304 performs processing RRC layer based on the control information outputted from decoding section 301. Then, RRC processing unit 304 outputs the processing result of the RRC layer to the MAC processing unit 305. Further, RRC processing unit 304 outputs control information such as UL grant or CTS signal to the MAC processing unit 305.

[0063]

　Measuring unit 302 based on the reception signals outputted from the radio processing unit 321 measures the interference power in the unlicensed Dobando. The measuring unit 302 outputs the measurement result of the interference power to the determination unit 303.

[0064]

　Determination unit 303 determines based on the outputted measurement results from the measurement unit 302, which one unlicensed Dobando is idle or busy. Determination unit 303 determines, for example, when the interference power measured by the measurement unit 302 is lower than the predetermined threshold value, unlicensed Dobando is idle. On the other hand, the determination unit 303 determines, for example, when the interference power measured by the measurement unit 302 is the threshold value than the predetermined, the unlicensed Dobando is busy. Then, the determination unit 303, the determination result, the measurement result with output from the measurement unit 302, and outputs it to the MAC processing unit 305.

[0065]

　MAC processor 305 performs processing of the MAC layer based on the processing results outputted from the RRC processing unit 304, the determination output from the determination unit 303 results of. Then, MAC processor 305, based on the processing of the MAC layer, and outputs a signal such as a DMRS to multiplexing section 345. Further, MAC processor 305, based on the processing of the MAC layer, and outputs the dummy signal and CTS signal or the like to the multiplexing unit 335.

[0066]

　Further, MAC processing section 305 outputs to the frequency mapping unit 333 and frequency mapping unit 343 will be described later assignment information of radio resources based on the processing of the MAC layer. Further, MAC processing section 305 outputs allocation information of radio resources created by the RRC processing unit 304 to the encoding and modulation unit 306 to be described later. Further, MAC processor 305, based on the determination result output from the determination unit 303, the base station apparatus 20 is unlicensed Dobando performing communication to confirm whether it is busy.

[0067]

　Packet generation unit 307 generates a packet including the user data output for example from the application processing unit (not shown). The packet generation unit 307 outputs the generated packet to the coding and modulation unit 306.

[0068]

　Encoding and modulating unit 306 performs processing for encoding and modulation on the packet output from the packet generation unit 307. The encoding and modulation unit 306, a signal processing of the coding and modulation is performed, based on the allocation information output radio resource from the MAC processing unit 305, unlicensed Dobando transmitting unit 330 or the license Dobando transmission and outputs it to the section 340.

[0069]

　License Dobando transmitting unit 340 performs a process for transmitting data in a license Dobando. License Dobando transmitting unit 340 includes a radio processing section 341, IFFT processor 342, frequency mapping section 343, FFT processing section 344 and multiplexing section 345,.

[0070]

　Multiplexing section 345 multiplexes the signals output from the MAC processing unit 305, and a signal output from the coding and modulation unit 306. Then, multiplexing section 345 outputs the transmission signal after multiplexing to the FFT processing unit 344.

[0071]

　FFT processor 344 performs FFT processing on the transmission signal outputted from multiplexing section 345. Thus, the transmission signal output from the multiplexing unit 345 is transformed from the time domain to the frequency domain. FFT processing section 344 outputs the transmission signal after FFT processing to the frequency mapping unit 343.

[0072]

　Frequency mapping unit 343, based on the allocation information of radio resources that are output from the MAC processing unit 305 performs frequency mapping to the transmission signals output from the FFT processor 344. The frequency mapping unit 343 outputs the transmission signal after frequency mapping to the IFFT processing unit 342.

[0073]

　IFFT processor 342 performs IFFT processing on the transmission signal outputted from the frequency mapping unit 343. Thus, the transmission signal output from the frequency mapping unit 343 is converted from the frequency domain to the time domain. IFFT processing section 342 outputs the transmission signal after IFFT processing to the wireless processing unit 341.

[0074]

　The radio processing section 341 performs radio processing on the transmission signal outputted from the IFFT processing unit 342. The radio processing performed by the wireless processing unit 341, include, for example, processing for converting the frequency of the transmitted signal from the baseband to the license Dobando. The radio processing unit 341 transmits the transmission signal after radio processing via the antenna 300.

[0075]

　Unlicensed Dobando transmitting unit 330 performs a process for transmitting data in a unlicensed Dobando. Unlicensed Dobando transmitting unit 330 includes a radio processing section 331, IFFT processor 332, frequency mapping section 333, FFT processing section 334 and multiplexing section 335,.

[0076]

　Multiplexing section 335 multiplexes the signals output from the MAC processing unit 305, and a signal output from the coding and modulation unit 306. Then, multiplexing section 335 outputs the transmission signal after multiplexing to the FFT processing unit 334.

[0077]

　FFT processor 334 performs FFT processing on the transmission signal outputted from multiplexing section 335. Thus, the transmission signal output from the multiplexing unit 335 is transformed from the time domain to the frequency domain. FFT processing section 334 outputs the transmission signal after FFT processing to the frequency mapping unit 333.

[0078]

　Frequency mapping unit 333, based on the allocation information of radio resources that are output from the MAC processing unit 305 performs frequency mapping to the transmission signals output from the FFT processor 334. The frequency mapping unit 333 outputs the transmission signal after frequency mapping to the IFFT processing unit 332.

[0079]

　IFFT processor 332 performs IFFT processing on the transmission signal outputted from the frequency mapping unit 333. Thus, the transmission signal output from the frequency mapping unit 333 is converted from the frequency domain to the time domain. IFFT processing section 332 outputs the transmission signal after IFFT processing to the wireless processing unit 331.

[0080]

　The radio processing section 331 performs radio processing on the transmission signal outputted from the IFFT processing unit 332. A wireless processing performed by the wireless processing unit 331 include, for example, processing for converting the frequency of the transmitted signal from the baseband to the unlicensed Dobando, the processing of controlling the transmission power in response to an instruction from the MAC processing unit 305. The radio processing unit 331 transmits the transmission signal after radio processing via the antenna 300.

[0081]

　[Operation of Radio Communication System 10]
　Next, with reference to FIG. 4, the terminal device 30 will be described an example of the operation for transmitting data in a unlicensed Dobando in response to an instruction from the base station apparatus 20. Figure 4 is a diagram showing an example of the operation of the wireless communication system 10 according to the first embodiment. Wireless communication system 10 described in FIG. 4 has a base station apparatus 20, the terminal apparatus 30a, and the terminal device 30b. 4, the upper part shows the signal transmitted by using the LC, the lower part shows the signal transmitted by using the UC. Further, in FIG. 4, the horizontal axis represents the passage of time, t1 ~ t5 are respectively indicates a period of the sub-frame (e.g., 1 millisecond).

[0082]

　Unlicensed Dobando is, for example, is divided into four sub-bands as shown in FIG. In this example, unlicensed Dobando is, for example, 20 MHz, the bandwidth of each subband, for example, 5 MHz. The signal 42a and signal 42b shown in each of the subbands in an unlicensed Dobando represents a signal terminal 30a is determined to busy in each sub-band. Signal terminal 30b is determined to busy in each sub-band is not shown in FIG.

[0083]

　First, MAC controller 202 of base station apparatus 20, when the transmission request of the data to the terminal device 30 has occurred, the subbands in Unlicensed Dobando to be used for transmission of data, transmission start timing, the backoff value, etc. to create a UL grant including the information. The transmission start timing included in the UL grant, e.g., timing after 4 subframes is designated from the subframe in which UL grant transmitted from the base station apparatus 20. Backoff value is a random value, when transmitting the UL grant for a plurality of terminal devices 30 in the same sub-frame period, the back-off value identical values ​​contained in each of the UL grant it is.

[0084]

　In the example of FIG. 4, MAC control unit 202 creates a UL grant 40 to the terminal device 30a, creating a UL grant 41 to the terminal device 30b. Further, in the example of FIG. 4, MAC controller 202, a subband Unlicensed Dobando to be used for transmission of the data, to specify the sub-band 2 to the terminal device 30a, the sub-band 4 to the terminal device 30b to specify.

[0085]

　MAC processor 305 of the terminal apparatus 30a, when receiving the UL grant 40 in the license Dobando for all subbands in unlicensed Dobando, it instructs the idle determine whether or not the determination unit 303. MAC processor 305, the UL Grant 41 before the predetermined time of the transmission start timing specified by (e.g. one frame before), for all of the subbands in an unlicensed Dobando, the determination unit to start the idle determine whether or not to instruct the 303. Incidentally, MAC processing section 305, when receiving the UL grant for all subbands in unlicensed Dobando, the start of the idle determining whether or not may be indicated to the determining unit 303.

[0086]

　In the example shown in FIG. 4, a signal 42a from the other of the LTE system are transmitted in subband 1, the signal 42b from the other LTE system is transmitted in subband 3, and 4. In the example shown in FIG. 4, the determination unit 303 of the terminal apparatus 30a determines, at sub-frame period t4, and all subbands in Unlicensed Dobando it is idle. If all of the sub-bands in the Unlicensed Dobando the determination unit 303 is determined to be idle, MAC processor 305, DIFS (Distributed coordination function Interframe Space) 43 period, check the idle state continues. Period DIFS43, if continuation of the idle state is confirmed, MAC processing section 305, a period 44 corresponding to the backoff value contained in the UL grant, to confirm the continuation of the idle state.

[0087]

　If the period 44 corresponding to the backoff value, continues the idle state is confirmed, MAC processor 305, in all of the subbands in an unlicensed Dobando, instructing transmission of the dummy signal to the unlicensed Dobando transmission unit 330 . Thus, for example, as shown in FIG. 4, in all the subbands of unlicensed Dobando, dummy signal 45 is transmitted.

[0088]

　The dummy signal 45 to other systems, if the signal which can be determined that all the sub-bands of Unlicensed Dobando is busy, may be any signal. The dummy signal 45 may be a signal of a predetermined pattern which serves as a preamble of the CTS signal 46 to be transmitted following the dummy signal 45.

[0089]

　Then, MAC processor 305, in all of the subbands in an unlicensed Dobando, instructing transmission of the CTS signal 46 to the unlicensed Dobando transmitting unit 330. Thus, for example, as shown in FIG. 4, in all the subbands in unlicensed Dobando, CTS signal 46 is transmitted. The payload of the CTS signal 46, the identification information of the cell to which the terminal apparatus 30a belongs is stored.

[0090]

　Incidentally, MAC processing section 305 instructs the unlicensed Dobando transmission unit 330, from the end of the transmission of the CTS signal 46, until the transmission start timing specified by the UL grant, all in Unlicensed Dobando subband, to transmit some signals. Thus, from the end of the transmission of the CTS signal 46, until the transmission start timing specified by the UL grant, it is possible to prevent that unlicensed Dobando from being used by other systems. The transmission is finished the CTS signal 46, in a period until the transmission start timing specified by the UL grant, the signal transmitted to the unlicensed Dobando may be repeated CTS signal 46, it may be addressed by the dummy signal .

[0091]

　Then, the terminal device 30a, the transmission start timing specified by the UL grant 40, and transmits the signal 47 of the data. In this embodiment, each terminal device 30, even in the transmission of data using the subbands in unlicensed Dobando, in synchronization with the timing of the subframe, the boundary between the sub-frame, the same sub-frame period length It transmits a signal 47 of the data.

[0092]

　In the present embodiment, each terminal device 30 transmits the data via the subbands in Unlicensed Dobando specified in UL grant. Therefore, when the subbands in Unlicensed Dobando specified in UL grant is idle, it appears data as may transmit using idle judged subband.

[0093]

　However, unlicensed Dobando not only LTE system to be assigned to each terminal device 30 for each sub-band, also used in a system such as a wireless LAN communication is performed using the unlicensed Dobando entire band. From this reason, in the radio communication system 10 of the present embodiment, even when using some subbands in unlicensed Dobando detects that all subbands in Unlicensed Dobando is idle , and it transmits the data using a part of the sub-band. This makes it possible to maintain fairness with other systems that perform communication using the entire band of Unlicensed Dobando.

[0094]

　On the other hand, the determination unit 303 of the terminal device 30b is not shown in FIG. 4, in the sub-frame period t4, detects a signal transmitted in the unlicensed Dobando, it is determined to be busy. Therefore, MAC processor 305 of the terminal device 30b does not instruct the transmission of the CTS signal to the unlicensed Dobando transmitting unit 330.

[0095]

　Here, MAC processor 305 of the terminal device 30b is the sub-frame period t4, receives a CTS signal 46 sent to the unlicensed Dobando from the terminal apparatus 30a. MAC processor 305, the CTS signal 46 received, determines whether the identification information of the same cell and the cell that the terminal apparatus 30b belongs is stored. If the identification information of the same cell and the cell that the terminal apparatus 30b belongs is stored, MAC processing section 305, even if the unlicensed Dobando is busy, the transmission start timing specified by the UL Grant 41 , it transmits a signal 48 of the data.

[0096]

　However, for example, as shown in FIG. 1, the radio waves from the base station apparatus 22 belonging to a different system than the LTE system to which the terminal device 30b belongs, there is a case where the determination unit 303 determines the unlicensed Dobando busy with. In that case, the terminal device 30b is performed to transmit the unlicensed Dobando, may affect the reception operation of the base station apparatus 22. Therefore, MAC processor 305, for example, the interference power measured by the measurement unit 302, threshold unlicensed Dobando is used to determine whether a busy (hereinafter, referred to as determination threshold) and, for transmission power It calculates the transmission power using the initial value and, a minimum transmission power. Then, MAC processing section 305 outputs a control signal indicating the calculated transmission power to the wireless processing section 331 of the Unlicensed Dobando transmitting unit 330. The radio processing unit 331, the power indicated by the control signal output from the MAC processing unit 305 transmits a signal 48.

[0097]

　For example, MAC processing section 305, and the interference power measured by the measurement unit 302, the ratio of the determination threshold, a transmission power determined by multiplying the initial value of the transmission power, higher transmission of the minimum transmission power to calculate the power. Then, MAC processing section 305 to transmit a signal 48 with the calculated transmission power, it instructs the wireless processing unit 331.

[0098]

　Specifically, MAC processor 305, for example, calculates the transmission power P by using the following equation (1).
[Number 1]

[0099]

　Here, the transmission power of the two devices included in the wireless communication system 10 is assumed to be approximately the same, if each device transmits radio waves, the intensity of the interference power in which one apparatus receives from the other device substantially the same as the intensity of the interference power other devices received from one device. Moreover, the interference power measured in one device, to be less than the determination threshold value, by lowering the transmission power of the other device, the signal transmitted from the other device, provide the receiving operation of one device influences it is possible to reduce the.

[0100]

　Therefore, in the above (1), the first measured interference power by measuring section 302 (dBm), the difference between the determination threshold value (dBm) (dB) is calculated. The calculated differences with (dB), the initial value of the transmission power and the transmission power calculated by subtracting from the (dBm) (dBm), of the minimum transmission power (dBm), the higher power transmission It is calculated as the power P.

[0101]

　For example, the interference power measured by the measurement unit 302 is -52 dBm, if the determination threshold is -62 dBm, the difference between the interference power and the threshold value becomes 10 dB. Therefore, by performing the transmission by 10dB lower power from the initial value of the transmission power, the signal transmitted from the terminal apparatus 30b, to be received by the -62dBm or less in the apparatus of the interference source. Thus, the terminal device 30b may be a case of transmitting a signal 48 to the subbands in Unlicensed Dobando specified in UL grant 41, it reduces the influence on the receiving operation of the interference source device.

[0102]

　Incidentally, if the measured interference power in the terminal device 30b is large, the power of the terminal apparatus 30b transmits the calculated low. When the transmission power is too low, a signal transmitted from the terminal device 30b will not reach a sufficient strength to the base station apparatus 20. Therefore, when the transmission power calculated by using the interference power and the determination threshold value is smaller than the minimum transmission power, transmission is performed at the minimum transmission power. The minimum transmission power, the terminal device 30 belonging to the cell, when transmitting data at the boundary of the cell, the smallest transmit power that may be the signal received by the base station device 20 from the terminal device 30. Information of minimum transmission power, for example, is included in the UL grant transmitted from the base station apparatus 20. Thus, the terminal device 30b is capable of receiving the transmitted data to the base station apparatus 20.

[0103]

　[Operation of the base station apparatus 20]
　Next, the operation of the base station apparatus 20. Figure 5 is a flowchart showing an example of the operation of the base station apparatus 20 in the first embodiment.

[0104]

　First, MAC controller 202 of base station apparatus 20 determines whether or not the transmission request of the data to the terminal apparatus 30 has occurred (S100). When the transmission request of the data to the terminal apparatus 30 has occurred (S100: Yes), MAC control unit 202 creates a UL grant (S101). Then, MAC control unit 202, a UL grant that was created, and outputs to the multiplexing unit 223 of the license Dobando transmitting unit 220.

[0105]

　Multiplexing section 223 multiplexes the UL grant has been received from the MAC controller 202, and a signal output from the modulation unit 222. Then, IFFT unit 224 performs IFFT processing on the multiplexed transmission signal by multiplexing section 223. The radio processing section 225 performs radio processing on the transmission signal IFFT processing is performed by the IFFT processing unit 224. Then, the wireless processing unit 225 transmits a transmission signal including a UL grant from the antenna 226 (S102). Then, MAC control unit 202 executes again the process shown in step S100.

[0106]

Operation of terminal device 30]
　Next, the operation of the terminal device 30. Figure 6 is a flow chart showing an example of the operation of the terminal device 30 according to the first embodiment. When the MAC processing unit 305 of the terminal device 30 has received the UL grant, the terminal device 30 starts the operations shown in the flowchart.

[0107]

　First, the measurement unit 302 based on the reception signals outputted from the radio processing unit 321 measures the interference power of Unlicensed Dobando (S200). Then, MAC processor 305, unlicensed Dobando instructs the determination unit 303 of the determination start or idle or not. Then, MAC processing section 305 refers to the determination result output from the determination unit 303 determines whether unlicensed Dobando Do idling (S201).

[0108]

　If unlicensed Dobando is idle (S201: Yes), MAC processing section 305, a period corresponding to the DIFS and back-off value, whether an idle state continues, i.e., whether unlicensed Dobando Do idle It is further determined (S203). If unlicensed Dobando is busy (S203: No), MAC processor 305 performs again the process shown in step S201.

[0109]

　On the other hand, if the unlicensed Dobando is idle (S203: Yes), MAC processing section 305 instructs the transmission of the dummy signal to the unlicensed Dobando transmitting unit 330. Unlicensed Dobando transmitting unit 330 transmits the dummy signal to the full bandwidth of Unlicensed Dobando (S204). Then, MAC processor 305 generates a CTS signal stored identification information of a cell to which the terminal device 30 belongs to the payload. Then, MAC processing section 305 instructs the transmission of the CTS signal created unlicensed Dobando transmitting unit 330. Unlicensed Dobando transmitting unit 330 transmits a CTS signal to the full bandwidth of Unlicensed Dobando (S205). Incidentally, MAC processing section 305, the like to transmit repeatedly CTS signal to unlicensed Dobando transmission unit 330, in a period until the transmission start timing specified by the UL grant to transmit the signal to the full bandwidth of Unlicensed Dobando.

[0110]

　Then, MAC processor 305, the transmission start timing specified by the UL grant, and instructs to transmit the data to the coding and modulation unit 306. Specifically, MAC processor 305, the coding and modulation unit 306, and instructs the processing of coding and modulation for the output packet from the packet generation unit 307. The transmission signal that has been encoded and modulated by the coding and modulation unit 306, the unlicensed Dobando transmitting unit 330 is transmitted via the subbands in Unlicensed Dobando specified in UL grant to the base station apparatus 20 that (S206).

[0111]

　On the other hand, if the unlicensed Dobando is busy (S201: No), MAC processing section 305 refers to the signal received from the RRC processing unit 304, receives a CTS signal from another terminal device 30 belonging to the same cell determines whether the not (S207). MAC processor 305, the payload of the CTS signal, the same identification information and identification information of the cell to which the terminal device 30 belongs when stored, receives a CTS signal from another terminal device 30 belonging to the same cell It determines that.

[0112]

　If the other terminal devices 30 belonging to the same cell receiving the CTS signal (S207: Yes), MAC processing section 305 instructs the transmission of data to the encoding and modulation unit 306. Thus, the packet outputted from packet generating section 307 is encoded and modulated by the coding and modulation unit 306. Then, the modulated signal is, the unlicensed Dobando transmitting unit 330, and transmitted to the base station apparatus 20 via the subbands in Unlicensed Dobando specified in UL grant (S208).

[0113]

　On the other hand, if the other terminal devices 30 belonging to the same cell does not receive the CTS signal (S207: No), whether the MAC processing unit 305, a predetermined time has elapsed from the transmission start timing designated by the UL grant It determines whether or not (S209). If the transmission start timing designated by the UL grant predetermined time has not elapsed (S209: No), MAC processor 305 performs again the process shown in step S201.

[0114]

　On the other hand, when the predetermined time from the transmission start timing specified by the UL grant has elapsed (S209: Yes), MAC processor 305 sends a signal for notifying the transmission failure to the license Dobando transmitting unit 340. License Dobando transmitting unit 340, a signal notifying transmission failure, and transmits the license Dobando to the base station apparatus 20 (S210). MAC processor 305, for example, the transmission start timing, for example, 3 if the period of the sub-frames has elapsed, to transmit a signal notifying transmission failure to the base station apparatus 20.

[0115]

[Effect]
　According to the wireless communication system 10 of the present embodiment, the terminal device 30 which has received the CTS signal from another terminal device 30 belonging to the same cell, if the unlicensed Dobando is determined to be busy the LBT even, to start the transmission of the data to unlicensed Dobando. Thus, it is possible to improve a decrease in throughput of data in the uplink of the terminal device 30.

[0116]

　The terminal device 30 that unlicensed Dobando is determined to be idle, from the transmission of the CTS signal including identification information of a cell to which the terminal device 30 belongs to the unlicensed Dobando subband specified in UL grant for transmitting data in a. Other terminal devices 30 by receiving the CTS signal, it is possible to determine whether the transmitted CTS signal from the terminal device 30 belonging to the same cell.

[0117]

　The terminal device 30 which has received the CTS signal from another terminal device 30 belonging to the same cell, the ratio of the interference power and the determination threshold, a transmission power determined by multiplying the initial value of the transmission power, the minimum transmission power transmit at higher transmission power of one of the. Thus, it is possible to reduce the influence on the reception operation of other devices.

[0118]

　Further, in this embodiment, the backoff value contained in the UL grant is the same value among the plurality of terminal devices 30. Thus, after the plurality of terminal devices 30 has detected the idle unlicensed Dobando simultaneously, the period corresponding to the DIFS and back-off value, when detecting a continuation of the idle, a plurality of terminal devices 30, substantially simultaneously dummy signal and to send a CTS signal to the unlicensed Dobando. CTS signal transmitted from each terminal apparatus 30 in this embodiment is the same signal. Therefore, even when the overlapped CTS signals transmitted from a plurality of terminal devices 30, are received by the other terminal devices 30 without the signal is lost. By CTS signal by a plurality of terminal devices 30 is transmitted, it is possible to reach a CTS signal to a wider range in the cell. This makes it possible to ensure the transmission opportunity of a number of terminal apparatus 30 than was determined unlicensed Dobando busy with.
Example 2

[0119]

[Operation of the wireless communication system 10]
　above terminal apparatus 30 according to the first embodiment of the is to transmit data at a timing synchronized with the timing of subframe, the terminal device 30 in this embodiment is independent of the timing of subframe point to send data to is different from the terminal apparatus 30 of example 1. Hereinafter will be described with reference to FIG. 7 differs from the first embodiment. Figure 7 is a diagram showing an example of the operation of the wireless communication system 10 according to the second embodiment.

[0120]

　The configuration of the wireless communication system 10, the base station apparatus 20 and terminal apparatus 30, in Example 2, except for points described below, the wireless communication system 10, the base station apparatus 20 described in Embodiment 1, and the terminal because it is similar to device 30, a detailed description thereof will be omitted. Further, in FIG. 7, elements denoted by the same reference numerals as in FIG. 4 are the same as elements described in FIG. 4, a detailed description thereof will be omitted.

[0121]

　For example, as shown in FIG. 7, MAC processor 305 of the terminal device 30a, the sub-frame period t4, when all the sub-bands in the Unlicensed Dobando the determination unit 303 is determined to be idle for a period of DIFS43 , to confirm the continuation of the idle state. Period DIFS43, if continuation of the idle state is confirmed, MAC processing section 305, a period 44 corresponding to the backoff value contained in the UL grant, to confirm the continuation of the idle state.

[0122]

　If the period 44 corresponding to the backoff value, continues the idle state is confirmed, MAC processor 305, in all of the subbands in an unlicensed Dobando to transmit the dummy signal 45 to the unlicensed Dobando transmitting unit 330.

[0123]

　Then, MAC processor 305, in all of the subbands in an unlicensed Dobando to transmit the CTS signal 46 to the unlicensed Dobando transmitting unit 330. In the present embodiment, the timing transmission is completed the CTS signal 46, also a timing earlier than the sub-frame specified by the UL grant, MAC processor 305, in the sub-band specified by the UL grant to start the transmission of the data.

[0124]

　Further, MAC processor 305 of the terminal apparatus 30b that unlicensed Dobando is determined to be busy, when the other terminal devices 30 belonging to the same cell has received the CTS signal, at the timing when the transmission of the CTS signal is completed, to start the transmission of the data.

[0125]

　Thus, in this embodiment, when the CTS signal from any of the terminal apparatus 30 which has detected the idle unlicensed Dobando is transmitted at the timing of the transmission end of the CTS signal, the terminal device 30, the data to start transmission. Thus, it is possible to improve the throughput of data transmitted from each terminal device 30 to the base station apparatus 20. Moreover, since it is possible to complete the transmission of data using unlicensed Dobando early, it is possible to shorten the time wastefully occupy the unlicensed Dobando, it is possible to enhance the utilization efficiency of Unlicensed Dobando.

[0126]

　The length of the present embodiment, the signal from each terminal device 30 is transmitted to the unlicensed Dobando is 1 subframe length. Thus, it is possible to divert a conventional transmit and receive buffers for sending and receiving data in units of sub-frame, it is possible to reduce the manufacturing cost of the terminal device 30.
Example 3

[0127]

[Operation of the wireless communication system 10]
　FIGS. 8 and 9 are diagrams showing an example of the operation of the wireless communication system 10 according to the third embodiment. The configuration of the wireless communication system 10, the base station apparatus 20 and terminal apparatus 30, in Example 3, except for the points described below, the wireless communication system 10, the base station apparatus 20 described in Embodiment 1, and the terminal because it is similar to device 30, a detailed description thereof will be omitted.

[0128]

　For example, as shown in FIG. 8, MAC controller 202 of base station apparatus 20, when the data transmission request is generated on the terminal device 30a, creating a first UL grant 40-1 for the terminal device 30a. The first UL grant 40-1 has the same contents as UL Grant 40 described in the first embodiment. Then, MAC controller 202, the first UL grant 40-1 created to output to multiplexing section 223.

[0129]

　Multiplexing section 223 multiplexes the first UL grant 40-1 outputted from the MAC controller 202, and a signal output from the modulation unit 222. Then, IFFT unit 224 performs IFFT processing on the multiplexed transmission signal by multiplexing section 223. Then, the wireless processing section 225 performs radio processing on the transmission signal IFFT processing is performed by the IFFT processing unit 224. Then, the wireless processing unit 225, in the sub-frame period t1, and transmits a transmission signal including a first UL grant 40-1 from antenna 226.

[0130]

　License Dobando receiver 310 of the terminal device 30a, transmitted in the license Dobando receives a transmission signal including a first UL grant 40-1 demodulates. Decoding unit 301 decodes the control information including a first UL grant 40-1 from a received signal output from the license Dobando receiver 310. RRC processing unit 304 outputs the control information decoded by the decoding section 301 to the MAC processing unit 305.

[0131]

　If the first UL grant 40-1 included in the control information received from the RRC processing unit 304, MAC unit 305, based on the outputted measurement results from the measurement unit 302, the carrier sense of Unlicensed Dobando the instructs the determination unit 303. Then, MAC processor 305 performs LBT with reference to the determination result output from the determination unit 303. In the example of FIG. 8, MAC processor 305, the sub-frame period t4, detects the idle unlicensed Dobando period 44 corresponding to DIFS43 and backoff value, it confirms the continuation of the idle state. During the period 44 corresponding to the backoff value, if the continuation of the idle state is confirmed, MAC processing section 305 instructs the transmission of the dummy signal 45 to the unlicensed Dobando transmitting unit 330. Then, MAC processing section 305 instructs the transmission of the CTS signal 46 to the unlicensed Dobando transmitting unit 330.

[0132]

　Then, MAC processor 305, the sub-frame period t5 after the transmission of the CTS signal 46, the first UL grant 40-1 unlicensed Dobando subbands specified in, unlicensed data signals 47-1 Dobando is transmitted to the transmission unit 330. Thus, unlicensed Dobando receiver 230 of base station apparatus 20 receives the signals 47-1 transmitted from the terminal apparatus 30a in the sub-frame period t5. The unlicensed Dobando receiver 230 decodes the signals 47-1 received.

[0133]

　Hereinafter, similarly, the base station device 20 from the first UL grant 40-2 ~ 40-6 is sent in the license Dobando to the terminal device 30a. Then, the terminal device 30a, the sub-frame period t6-t10, each transmit signals 47-2 ~ 47-6 for data subbands Unlicensed Dobando. Thus, the base station apparatus 20, the sub-frame period t6-t10, receives the signals 47-2 ~ 47-6 transmitted from the terminal device 30a.

[0134]

　Then, in the sub-frame period t6 is receiving data from the terminal device 30a in unlicensed Dobando, if the data transmission request is generated on the terminal device 3b, MAC controller 202 of base station apparatus 20, a second UL grant to create a 49. The second UL grant includes transmission instruction indicating to start sending without LBT. Then, MAC controller 202, a transmission signal including a second UL grant 49 created, similarly to the first UL grant 40-1 to 40-6, and transmits the license Dobando transmitting unit 220.

[0135]

　License Dobando receiver 310 of the terminal device 30b is transmitted in the license Dobando receives a transmission signal including a second UL grant 49 demodulates. Decoding unit 301 decodes the control information including a second UL grant 49 from the received signal outputted from the license Dobando receiver 310. RRC processing unit 304 outputs the control information decoded by the decoding section 301 to the MAC processing unit 305.

[0136]

　If the second UL grant 49 is included in the control information received from the RRC processing unit 304, MAC processing section 305, by not instructing the carrier sense Unlicensed Dobando the determination unit 303 is omitted LBT. Then, MAC processor 305, the sub-frame period t10 is a transmission start timing specified by the second UL grant 49 to transmit the signal 48 of the data in the Unlicensed Dobando transmitting unit 330.

[0137]

　Here, when the base station device 20 is receiving data in unlicensed Dobando from the terminal apparatus 30a, LTE system has a base station apparatus 20 belongs has acquired the transmission right of Unlicensed Dobando already. Therefore any While receiving data from the subordinate terminal apparatus 30a in unlicensed Dobando subbands other than the subbands assigned to the terminal device 30a is idle. Thus, while receiving data from a subordinate terminal apparatus 30a in unlicensed Dobando, if the other terminal devices 30b subordinate UL grant is sent, the other terminal devices 30b does not have to perform the LBT . Therefore, by the base station apparatus 20 in such a case to send the second UL grant to the terminal apparatus 30, it is possible to ensure the transmission opportunity of the terminal device 30. Further, by the LBT is omitted, the processing load of the terminal device 30 can be reduced.

[0138]

　Further, in the example shown in FIG. 9, MAC controller 202 of base station apparatus 20, when the data transmission request to the terminal device 30a and 30b is generated, the first UL grant 40-1 on the terminal device 30a, the terminal device to create a first UL grant 41-1 against 30b. The first UL grant 40-1 and 41-1 that are created by the MAC control unit 202, the multiplexing unit 223 are multiplexed on the signal output from the modulator 222. The multiplexed transmitted signal, IFFT processing by the IFFT processor 224, and, by radio processing is performed by the wireless processing unit 225 is transmitted in sub-frame period t1.

[0139]

　MAC processor 305 of the terminal apparatus 30a performs LBT, the sub-frame period t4, detects the idle unlicensed Dobando period 44 corresponding to DIFS43 and backoff value, confirms the continuation of the idle state. During the period 44 corresponding to the backoff value, if the continuation of the idle state is confirmed, MAC processing section 305 instructs the transmission of the dummy signal 45 to the unlicensed Dobando transmitting unit 330. Then, MAC processing section 305 instructs the transmission of the CTS signal 46 to the unlicensed Dobando transmitting unit 330.

[0140]

　Then, MAC processor 305, the sub-frame period t5 after the transmission of the CTS signal 46, the first UL grant 40-1 unlicensed Dobando subbands specified in, unlicensed data signals 47-1 to be sent to the Dobando transmission unit. Thus, unlicensed Dobando receiver 230 of base station apparatus 20 receives the signals 47-1 transmitted from the terminal apparatus 30a in the sub-frame period t5. The unlicensed Dobando receiver 230 decodes the signals 47-1 received.

[0141]

　Hereinafter, similarly, the base station device 20 from the first UL grant 40-2 ~ 40-6 is sent in the license Dobando to the terminal device 30a. Then, the terminal device 30a, the sub-frame period t6-t10, each transmit signals 47-2 ~ 47-6 for data subbands Unlicensed Dobando. Thus, the base station apparatus 20, the sub-frame period t6-t10, receives the signals 47-2 ~ 47-6 transmitted from the terminal device 30a.

[0142]

　On the other hand, the terminal device 30b, in unlicensed Dobando detects the interference power from other systems, are determined to unlicensed Dobando is busy. Further, in the example of FIG. 9, the terminal apparatus 30b is assumed to have failed to receive the CTS signal transmitted to the unlicensed Dobando from the terminal apparatus 30a. In that case, the terminal device 30b is the signal 47-1 to 47-6 to the terminal apparatus 30a transmits to the unlicensed Dobando also measured as interference power, unlicensed Dobando continues determined to be busy. As a result, the terminal device 30b does not transmit the data.

[0143]

　MAC control unit 202 of the base station apparatus 20, to the first UL grant 40-1 which has transmitted to the terminal device 30a in sub-frame period t1, receives data transmitted in a sub-frame period t5 from the terminal device 30a . On the other hand, MAC control unit 202 detects that the relative first UL grant 41-1 which has transmitted to the terminal device 30b in the sub-frame periods t1, no data is received in subframe period t5. In this case, MAC controller 202 creates a second UL grant 49 including a transmission instruction indicating to start sending without LBT. Then, MAC control unit 202 outputs a transmission signal including a second UL grant 49 that created the licenses Dobando transmitting unit 220 to transmit to the terminal device 30b in the next subframe period t6. Accordingly, in the sub-frame period t6, the second UL grant 49 is transmitted to the terminal device 30b.

[0144]

　License Dobando receiver 310 of the terminal device 30b is transmitted in the license Dobando receives a transmission signal including a second UL grant 49 demodulates. Decoding unit 301 decodes the control information including a second UL grant 49 from the received signal outputted from the license Dobando receiver 310. RRC processing unit 304 outputs the control information decoded by the decoding section 301 to the MAC processing unit 305.

[0145]

　MAC processing unit 305, if the second UL grant 49 is included in the control information received from the RRC processing unit 304, by not instructing the carrier sense Unlicensed Dobando the determination unit 303 is omitted LBT. Then, MAC processor 305, in the next subframe period t7 subframe periods t6 receiving the second UL grant 49 to transmit the signal 48 of the data in the Unlicensed Dobando transmitting unit 330.

[0146]

　This makes it possible to ensure the transmission opportunity of the terminal device 30 fails to receive the CTS signal transmitted from another terminal device 30 belonging to the same cell. Thus, it is possible to improve a decrease in throughput of data in the uplink of the terminal device 30 fails to receive the CTS signal.

[0147]

[Operation of the base station apparatus 20]
　Next, the operation of the base station apparatus 20. Figure 10 is a flowchart showing an example of the operation of the base station apparatus 20 according to the third embodiment.

[0148]

　First, MAC controller 202 of base station apparatus 20 determines whether or not the transmission request of the data to the terminal apparatus 30 has occurred (S110). When the transmission request of the data to the terminal apparatus 30 has occurred (S110: Yes), MAC control unit 202 determines whether or not receive data transmitted from another terminal device 30 (S 111).

[0149]

　If it is being received the data transmitted from another terminal device 30 (S111: Yes), MAC control unit 202 creates a second UL grant including an instruction to start transmission without LBT (S112). Then, MAC control unit 202 to transmit the second UL grant created license Dobando transmission unit 220 (S113). Then, MAC control unit 202 executes again the process shown in step S110.

[0150]

　On the other hand, if it is not receiving data transmitted from another terminal device 30 (S111: No), MAC controller 202, a first UL grant which does not include an instruction to start transmission without LBT to create a (S114). Then, MAC control unit 202 to transmit the first UL grant created license Dobando transmission unit 220 (S115). Then, MAC control unit 202 executes again the process shown in step S110.

[0151]

　If the data transmission request has not occurred (S110: No), MAC control unit 202, transmission start timing specified by the first UL grant in the terminal device 30 of the same period, not transmitting data It determines whether there is a terminal device 30 (S116). When the transmission start timing in the terminal device 30 in the same period, no terminal 30 is not sending data (S116: No), MAC control unit 202 executes again the process shown in step S110.

[0152]

　In the transmission start timing of the terminal device 30 in the same period, if there is a terminal device 30 not transmitting data (S116: Yes), MAC controller 202 receives the data transmitted from another terminal device 30 It determines whether in (S117). If it is not receiving data transmitted from another terminal device 30 (S117: No), MAC control unit 202 executes again the process shown in step S110.

[0153]

　On the other hand, if it is receiving data transmitted from another terminal device 30 (S117: Yes), MAC control unit 202 creates a second UL grant (S118). Then, MAC control unit 202 to transmit the second UL grant created license Dobando transmission unit 220 (S119). Then, MAC control unit 202 executes again the process shown in step S110.

[0154]

Operation of terminal device 30]
　Next, the operation of the terminal device 30. Figure 11 is a flow chart showing an example of the operation of the terminal device 30 according to the third embodiment. When the MAC processing unit 305 of the terminal device 30 receives the first or the second UL grant, the terminal device 30 starts the operations shown in the flowchart.

[0155]

　First, MAC processing section 305, the received UL grant determines whether a second UL grant (S220). If UL grant is a second UL grant (S220: Yes), MAC processor 305, skip LBT, the transmission start timing specified by the second UL grant, unlicensed Dobando data signal It is transmitted to the transmission unit 330 (S221).

[0156]

　On the other hand, if the received UL grant is the first UL grant (S220: No), MAC processing section 305 according to the first UL grant, to perform the processing of steps S200 ~ S210 described with reference to FIG. 6 .
Example 4

[0157]

　In the wireless communication system 10 in the first embodiment described above, the terminal device 30 determines the idle unlicensed Dobando began transmission from the transmission of the CTS signal data to Unlicensed Dobando when it is determined that idle. In contrast, in the wireless communication system 10 of the present embodiment, the base station device 20, performs carrier sense of unlicensed Dobando, transmits a predetermined signal indicative of a transmission permission data when it is determined that idle. In the present embodiment, the predetermined signal is, for example identification information of the base station device 20 includes RTS (Request To Send) is a signal. Terminal 30 which has received the UL grant, when detecting the RTS signal, if the own apparatus to the detected RTS signal contains identification information belongs cell, without performing LBT, sub specified in UL grant for transmitting data in a band.

[0158]

[Base station apparatus 20]
　FIG. 12 is a block diagram illustrating an example of a base station apparatus 20 according to the fourth embodiment. Note that except for the points described below, the configuration denoted by the same reference numerals as in FIG. 2 in FIG. 12 is the same as the configuration described in FIG. 2, and detailed description thereof will be omitted. The configuration of the terminal device 30 is the same as that of the terminal device 30 in the first embodiment described with reference to FIG. 3, the description thereof is omitted.

[0159]

　The base station apparatus 20, for example, as shown in FIG. 12, has a determination unit 205 and the measurement unit 206. Measuring unit 206 based on the reception signals outputted from the FFT processing unit 233 measures the interference power in the unlicensed Dobando. The measuring unit 206 outputs the measurement result of the interference power to the determination unit 205. Determination unit 205 determines based on the outputted measurement results from the measurement unit 206, which one unlicensed Dobando is idle or busy. Then, the determination unit 205 outputs the determination result to the MAC control unit 202.

[0160]

[Operation of the wireless communication system 10]
　FIG 13 is a diagram showing an example of the operation of the wireless communication system 10 in the fourth embodiment.

[0161]

　First, MAC controller 202 of base station apparatus 20, when the transmission request of the data to the terminal apparatus 30a and 30b occurs, all of the subbands in an unlicensed Dobando, idle determine whether or not the determination unit 205 to tell. In the example shown in FIG. 13, the determination unit 205 determines, in a period 50 in the sub frame period t0, and all subbands in Unlicensed Dobando is idle.

[0162]

　If all of the sub-bands in the Unlicensed Dobando the determination unit 205 is determined to be idle, MAC controller 202, a UL grant 51 to the terminal device 30a, creating respectively a UL grant 52 to the terminal device 30b . Then, MAC control unit 202, a UL grant 51 and 52 was created, is transmitted to the license Dobando transmitting unit 220. MAC processor 305 of the terminal device 30a receives the UL Grant 51 transmitted from the base station apparatus 20. Further, MAC processor 305 of the terminal device 30b receives the UL Grant 52 transmitted from the base station apparatus 20.

[0163]

　In the example shown in FIG. 13, the signal 53a from the other of the LTE system is transmitted in subband 1, the signal 53b from the other of the LTE system is transmitted in subband 3, and 4.

[0164]

　Then, MAC controller 202, for all of the subbands in an unlicensed Dobando, instructs the idle determine whether or not the determination unit 205. Determination unit 205, a UL Grant 51 and 52 a predetermined time before the transmission start timing specified in (e.g. 1 frame before), for all of the subbands in an unlicensed Dobando, the determination unit to start the idle determine whether or not to instruct the 205. Incidentally, MAC control unit 202, when transmitting the UL grant for all subbands in unlicensed Dobando, the start of the idle determining whether or not may be indicated to the determination unit 205.

[0165]

　In the example shown in FIG. 13, the determination unit 205 determines, in the sub-frame period t4, and all subbands in Unlicensed Dobando is idle. If all of the sub-bands in the Unlicensed Dobando the determination unit 205 is determined to be idle, MAC controller 202, during DIFS54 and backoff period 55, to confirm the continuation of the idle state.

[0166]

　Between DIFS54 and backoff period 55, if the continuation of the idle state is confirmed, MAC control unit 202, the license Dobando transmitting unit 220 to transmit the RTS signal 56 including identification information of the cell when the device itself managed in the license Dobando to tell. Thus, for example, as shown in FIG. 13, in the license Dobando, RTS signal 56 is transmitted. Also, if the determination unit 205 determines unlicensed Dobando is idle, MAC controller 202, the unlicensed Dobando, unlicensed Dobando transmitting unit 210 to transmit the RTS signal 57 including identification information of the cell device itself manages to tell. Thus, for example, as shown in FIG. 13, in all of the subbands in an unlicensed Dobando, RTS signal 57 is transmitted.

[0167]

　MAC processor 305 of each terminal device 30, sent in the license Dobando, the RTS signal 56 including identification information of the cell device itself belongs, transmitted in unlicensed Dobando, the identification information of the cell where the own apparatus belongs detecting the RTS signal 57 including. Then, MAC processor 305 waits from the transmission of the RTS signals 56 and 57 is finished to SIFS (Short Interframe Space) 58 has elapsed. When the SIFS58 has elapsed, MAC processor 305 of the terminal device 30a instructs the transmission of data signal 59 to the unlicensed Dobando transmission unit 330 of the terminal apparatus 30a. Further, MAC processor 305 of the terminal device 30b instructs the transmission of data signal 60 to the unlicensed Dobando transmission unit 330 of the terminal apparatus 30b. Accordingly, in the sub-frame period t5, the signal 59 from the terminal 30a is transmitted to the sub-band 2, the signal 60 from the terminal apparatus 30b to the sub-band 4 is transmitted.

[0168]

　Here, if the individual terminal device 30 performs an LBT individually loose timing, there is a case where the timing is determined that the unlicensed Dobando is idle shifts. Therefore, when the terminal device 30 it is determined that the idle first starts transmitting the unlicensed Dobando, another terminal device 30, will be determined unlicensed Dobando busy with the transmission of other terminals 30 is postponed that.

[0169]

　In contrast, in the wireless communication system 10 of the present embodiment, by the base station apparatus 20 performs LBT, to the terminal device 30 under the base station apparatus 20 can instruct the start of transmission uniformly. Therefore, the transmission of one of the terminal device 30, it is possible to prevent the transmission of another terminal device 30 is prevented, thereby improving the throughput of data in the uplink of the terminal device 30.

[0170]

　In the present embodiment, MAC controller 202, prior to transmission of the UL grant, but to execute the carrier sense to the determination unit 205, the carrier sense before transmission of UL grant may not be performed. Further, in the present embodiment, MAC controller 202, but transmits an RTS signal to both the license Dobando and unlicensed Dobando may not transmit an RTS signal to the license Dobando. Further, MAC controller 202 transmits the RTS signal towards the license Dobando, the direction of unlicensed Dobando, may transmit the dummy signal.

[0171]

　Also in this embodiment, similarly to Embodiment 3, while receiving the data from the terminal 30 in the unlicensed Dobando, if the data transmission request is generated for the other terminal devices 30, MAC controller 202, a second UL grant may be transmitted to another terminal device 30. Also in this embodiment, in the same manner as in Example 3, MAC controller 202, transmission start timing specified by the first UL grant is not transmitted in the terminal device 30 of the same period, the data terminal second UL grant to the apparatus 30 may be transmitted to.

[0172]

[Operation of the base station apparatus 20]
　Next, the operation of the base station apparatus 20. Figure 14 is a flowchart showing an example of the operation of the base station apparatus 20 according to the fourth embodiment.

[0173]

　First, MAC controller 202 of base station apparatus 20 determines whether or not the transmission request of the data to the terminal apparatus 30 has occurred (S130). When the transmission request of the data to the terminal apparatus 30 has occurred (S130: Yes), the measurement unit 206 based on the reception signals outputted from the FFT processing unit 233 measures the interference power of Unlicensed Dobando (S131). Then, MAC controller 202, unlicensed Dobando instructs the judgment start or idle or not the determination unit 205. Then, MAC control unit 202 refers to the determination result output from the determination unit 205 determines whether unlicensed Dobando Do idling (S132).

[0174]

　If unlicensed Dobando is idle (S132: Yes), MAC control unit 202 creates a UL grant (S133). Then, MAC control unit 202, a UL grant that was created, is transmitted to the license Dobando transmission unit 220 (S134). The measurement unit 206 based on the reception signals outputted from the FFT processing unit 233 measures the interference power of Unlicensed Dobando (S135). Then, MAC control unit 202 determines, for example, from example 1 subframe before the transmission start timing specified by UL grant, with reference to the determination result output from the determination unit 205, whether unlicensed Dobando Do idle (S136).

[0175]

　If unlicensed Dobando is idle (S136: Yes), MAC control unit 202 instructs the transmission of the RTS signal to the license Dobando transmission unit 220 in the license Dobando. Further, MAC controller 202, all of the subbands in an unlicensed Dobando, instructing transmission of the RTS signal to unlicensed Dobando transmitting unit 210. Thus, in all of the subbands in the license Dobando and unlicensed Dobando, RTS signal is transmitted (S137).

[0176]

Terminal apparatus 30]
　Next, the operation of the terminal device 30. Figure 15 is a flow chart showing an example of the operation of the terminal device 30 in the fourth embodiment. When the MAC processing unit 305 of the terminal device 30 has received the UL grant, the terminal device 30 starts the operations shown in the flowchart.

[0177]

　First, MAC processing section 305 determines whether it has received the RTS signal (S230). When receiving the RTS signal (S230: Yes), MAC processing section 305 waits for a predetermined period after transmission of the RTS signal is completed until SIFS58 has elapsed (S231). When the SIFS58 has elapsed, MAC processing section 305 instructs the transmission of data signals to the Unlicensed Dobando transmitting unit 330. Thus, data is transmitted from the terminal device 30 to the subbands in unlicensed band specified by the UL grant (S232).

[0178]

　[Hardware]
　base station apparatus 20 and terminal apparatus 30 in each of the aforementioned embodiments can be implemented by the wireless communication apparatus 70 shown in FIG. 16 for example. Figure 16 is a diagram showing an example of a wireless communication device 70 for realizing the functions of the base station device 20 or the terminal device 30. Wireless communication device 70, for example, a memory 71, a processor 72, analog-to-digital converter (A / D) 73, a multiplier 74, an amplifier 75, an oscillator 76, a digital-to-analog converter (D / A) 77, a multiplier 78, amplifier 79, and an antenna 80. The wireless communication device 70, in addition, may include an interface for performing wired communication with an external communication device.

[0179]

　Antenna 80 receives a radio signal transmitted from the periphery of the own device, and outputs the received signal to the amplifier 75. The antenna 80 transmits the signal output from the amplifier 79 to the outside of the apparatus.

[0180]

　Amplifier 75 amplifies the signal antenna 80 has received. Then, the amplifier 75 outputs the amplified signal to the multiplier 74. The multiplier 74, a signal output from the amplifier 75, by multiplying the clock signal outputted from the oscillator 76, converts the frequency of the received signal from the radio frequency band to baseband. Then, the multiplier 74 outputs a frequency-converted signal to analog-to-digital converter 73.

[0181]

　Analog-to-digital converter 73 converts the analog signal output from the multiplier 74 into a digital signal. Analog-to-digital converter 73 outputs a digital signal converted from an analog signal to the processor 72.

[0182]

　The processor 72 controls the entire wireless communication device 70. The processor 72 may be realized by, for example, a CPU (Central Processing Unit) and DSP (Digital Signal Processor). The processor 72 performs reception processing of signals output from the analog-digital converter 73. The processor 72 generates a transmission signal, and outputs the generated transmission signal to the digital-to-analog converter 77.

[0183]

　The memory 71 may include, for example, main memory and auxiliary memory. The main memory is, for example, RAM (Random Access Memory). The main memory is used as a work area of ​​the processor 72. Auxiliary memory is, for example, a nonvolatile memory such as a magnetic disk or a flash memory. The auxiliary memory, various programs for operating the processor 72 is stored. Program stored in the auxiliary memory is executed by the processor 72 is loaded into the main memory. Further, the auxiliary memory, for example, various predetermined thresholds are stored.

[0184]

　Digital-to-analog converter 77 converts the digital signal of the transmission signal output from the processor 72 into an analog signal. Digital-to-analog converter 77 outputs an analog signal converted from a digital signal to the multiplier 78.

[0185]

　The multiplier 78, the analog signal converted by the digital-to-analog converter 77, by multiplying the clock signal outputted from the oscillator 76, converts the frequency of the transmitted signal from the baseband to the RF band. Then, the multiplier 78 outputs the frequency converted signal to the amplifier 79. Amplifier 79 amplifies the signal output from the multiplier 78. Then, the amplifier 79 outputs the amplified signal to the outside through the antenna 80.

[0186]

　Oscillator 76 generates a predetermined frequency of the clock signal (AC signal of a continuous wave). Then, the oscillator 76 outputs the generated clock signal to the multiplier 74 and the multiplier 78.

[0187]

　If the wireless communication device 70 functions as a base station apparatus 20 shown in FIG. 2 or FIG. 12, an antenna 216,226,235, and 245 shown in FIG. 2 or FIG. 12 can be realized by, for example, the antenna 80 . The radio processing unit 215,225,234, and 244 shown in FIG. 2 or FIG. 12, for example, analog-to-digital converter 73, a multiplier 74, an amplifier 75, an oscillator 76, a digital-to-analog converter 77, a multiplier 78, and it can be realized by the amplifier 79. Further, other configuration shown in FIG. 2 or FIG. 12 can be realized by, for example, a processor 72 and memory 71.

[0188]

　If the wireless communication device 70 functions as a terminal device 30 shown in FIG. 3, the antenna 300 shown in FIG. 3 may be implemented by, for example, the antenna 80. The radio processing unit 311, 321, 331, and 341 shown in FIG. 3, for example, analog-to-digital converter 73, a multiplier 74, an amplifier 75, an oscillator 76, a digital-to-analog converter 77, a multiplier 78, and an amplifier 79 it can be realized by. Further, other configuration shown in FIG. 3 may be implemented by, for example, a processor 72 and memory 71.

[0189]

[Others]
　In each embodiment described above, when a signal from another system to different subbands has been transmitted from the sub-band specified by the UL grant, the data in the sub-band specified by the UL grant even sent, the low impact on the reception operation of the other system. Therefore, MAC processor 305 of the terminal device 30, in the sub-band specified by the UL grant, the interference power in the case of less than the determination threshold value, it is also possible to perform the transmission of data. Incidentally, when the interference power in the designated subbands in UL grant or more decision threshold, MAC processor 305 of the terminal device 30 may not perform the transmission of data.

[0190]

　Also, shown in the first embodiment (1) In formula is to calculate the transmission power using the interference power and a determination threshold value intended for all bands of the unlicensed Dobando, the disclosed technology is not limited thereto. MAC processor 305, for example, in the subbands in Unlicensed Dobando specified in UL grant, and the interference power measured by the measurement unit 302, and a determination threshold, and the initial value of the transmission power, and a minimum transmission power it may be calculated transmission power used.

[0191]

　For example, MAC processing section 305, the subbands in Unlicensed Dobando specified in UL grant, the ratio of the interference power and the determination threshold, a transmission power determined by multiplying the initial value of the transmission power, the minimum transmission power It calculates the transmission power of the higher of the. Then, MAC processing section 305 to transmit the data with the calculated transmission power, may instruct the wireless processing unit 331.

[0192]

　Specifically, MAC processor 305, for example, may calculate the transmission power P by using equation (2) below.
[Number 2]

[0193]

　Further, in Examples 2 to 4 described above, the terminal device 30 which performs transmission in unlicensed bands without LBT, for example (1) described in Example 1, or, based on the aforementioned equation (2) in the transmission power calculated Te, it may be performed to transmit. Incidentally, when the interference power in the designated subbands in UL grant or more decision threshold, MAC processor 305 of the terminal device 30 may not perform the transmission of data.

[0194]

　Note that the components shown in each embodiment described above, in order to facilitate understanding of the devices, in which classified by function in accordance with the main processing content. Therefore, by segment method and the name of the components, it does not disclose the technology is limited. Configuration of each apparatus shown in the above embodiment, depending on the processing contents, further can either be divided into a number of components, it can be classified as one component to perform the more processing . Further, each process may be implemented as a processing by software, ASIC may be implemented by (Application Specific Integrated Circuit) dedicated hardware or the like.

DESCRIPTION OF SYMBOLS

[0195]

10 wireless communication system
20 a base station apparatus
220 the license Dobando transmitting section
30 terminal
303 determining unit
330 Unlicensed Dobando transmission unit

The scope of the claims

[Claim 1]

　And a first communication apparatus and a plurality of second communication devices, said first communication device, and said plurality of second communication apparatuses, share the local system only dedicated band and other system in a wireless communication system for wireless communication using the shared bandwidth,
　the first communication device,
　the control information instructing the resource in said shared bandwidth to transmit data, the second with a resource in said dedicated band first transmission unit for transmitting to the communication device
　has,
　each of said second communication apparatus,
　a determining section which of resource idle or busy in said shared bandwidth,
　the determination unit when said resource in the shared band is determined to be idle, a predetermined signal indicating the start of transmission of the data after transmitting the shared bandwidth, resources indicated in a shared band control information by A second transmission unit that transmits data using
　a a,
　the second transmission unit,
　when over resources within said shared bandwidth to receive the predetermined signal from the other of said second communication device the, even when the resources of said shared bandwidth by the determination unit is determined to be busy, and characterized in that transmits data by using the resource in the shared band instructed by the control information wireless communication system to be.

[Claim 2]

　The second transmission unit,
　wherein when the resources in the shared bandwidth is determined to be idle, transmitting said predetermined signal including the identification information of the cell where the information processing apparatus belongs to the shared bandwidth by the determination unit ,
　the predetermined signal transmitted in the shared bandwidth from another said second communication apparatus, when the own device is included identification information belongs cell, resources in said shared bandwidth by the determination unit the wireless communication system according to claim 1 but even when it is determined to be busy, characterized by transmitting the data using the resources in the indicated common band in the control information.

[Claim 3]

　Each of the second communication device,
　comprises the further measuring unit for measuring interference power in the shared band,
　the second transmission unit,
　and the interference power, whether the resource is busy in said shared bandwidth the ratio of the threshold used Kano determination, and transmission power determined by multiplying the initial value of the transmission power, at the higher transmission power of the minimum transmission power, claims, characterized in that for transmitting data the wireless communication system according to 1.

[Claim 4]

　Each of said second communication apparatus,
　a measuring section that measures interference power in the resource in the indicated common band in the control information further
　said second transmission section is
　instructed by the control information than a threshold value used for determining whether a busy in the resource in the shared band, wherein when the interference power measured by the measurement unit is low, to claim 1, characterized in that to transmit the data of the wireless communication system.

[Claim 5]

　Each of said second communication apparatus,
　a measuring section that measures interference power in the resource in the indicated common band in the control information further
　wherein the second transmission unit,
　and the interference power, the control the ratio of the threshold value used for determining busy whether the resources indicated in a shared band information, and transmit power obtained by multiplying the initial value of the transmission power, higher transmission of the minimum transmission power the wireless communication system according to claim 1, characterized in that to transmit at power, data.

[Claim 6]

　The first transmission unit,
　the control information further includes a back-off value, transmitted using the resources of the dedicated band to the second communication device,
　wherein the back-off value,
　a plurality of the second communication the wireless communication system according to claim 1, characterized in that the same value between the devices.

[Claim 7]

　The first transmission unit,
　while from the second communication device is receiving the data using the resources in said shared bandwidth, when transmitting the control information to the other of said second communication device, said shared resources in bandwidth of whether it is idle or busy sending instruction to start transmission of the data without performing the determination, further included in the control information,
　the determination unit,
　the said control information if it contains transmission instruction, the without determining resource is whether it is idle or busy in the shared band,
　the second transmission section,
　the contains transmission instruction to said control information the wireless communication system according to claim 1, case, and transmits the data by using the resource indicated in the shared band control information that are.

[8.]

　Each of said second communication apparatus
　further includes a measurement unit for measuring interference power in said shared bandwidth,
　the second transmission unit
　is busy and the interference power, in the resource in said shared bandwidth the ratio of whether threshold used to determine, to a transmission power determined by multiplying the initial value of the transmission power, at the higher transmission power of the minimum transmission power, and transmits the data the wireless communication system according to claim 7.

[Claim 9]

　Each of said second communication apparatus,
　a measuring section that measures interference power in the resource in the indicated common band in the control information further
　said second transmission section is
　instructed by the control information than a threshold value used for determining whether a busy in the resource in the shared band, wherein when the interference power measured by the measurement unit is low, to claim 7, characterized in that for transmitting data of the wireless communication system.

[Claim 10]

　Each of said second communication apparatus,
　a measuring section that measures interference power in the resource in the indicated common band in the control information further
　wherein the second transmission unit,
　and the interference power, the control the ratio of the threshold value used for determining whether a busy in the resource in the shared band indicated by the information, and transmission power determined by multiplying the initial value of the transmission power, the higher of the minimum transmission power the wireless communication system according to claim 7 in which the transmission power, and transmits the data.

[Claim 11]

　The second transmission unit,
　a wireless communication system of claim 10 wherein the interference power when it is below the threshold value, and transmits the data.

[Claim 12]

　And a first communication apparatus and a plurality of second communication devices, said first communication device, and said plurality of second communication apparatuses, share the local system only dedicated band and other system in a wireless communication system for wireless communication using the shared bandwidth,
　the first communication device,
　the resource in said shared bandwidth and a determination unit that determines which of the idle or busy,
　the shared bandwidth to transmit data the control information for instructing the resource of the inner, transmitted using a resource in said dedicated band to the second communication device, when the resource in said shared bandwidth is determined to be idle by the determination unit, a predetermined signal indicating transmission permission of the data and the first transmission unit to be transmitted to the shared bandwidth
　has,
　each of the second communication device,
　the first communication over a resource within said shared bandwidth instrumentation When receiving the particular signal from without carrier sensing, the second transmission unit that transmits data by using the resource indicated in the shared band control information
　wirelessly, characterized in that it comprises a communication system.

[Claim 13]

　Said first transmission section is
　transmitted when the resources of said shared bandwidth by the determination unit is determined to be idle, said predetermined signal including the identification information of the cell when the device itself managed by the shared bandwidth and,
　the second transmission unit,
　upon receiving the predetermined signal including the identification information of the cell device itself belongs, transmitting data using resources in a shared band instructed by the control information the wireless communication system according to claim 12, wherein.

[Claim 14]

　Each of said second communication apparatus
　further includes a measurement unit for measuring interference power in said shared bandwidth,
　the second transmission unit
　is busy and the interference power, in the resource in said shared bandwidth the ratio of whether threshold used to determine, to a transmission power determined by multiplying the initial value of the transmission power, at the higher transmission power of the minimum transmission power, and transmits the data the wireless communication system according to claim 12.

[Claim 15]

　Each of said second communication apparatus,
　a measuring section that measures interference power in the resource in the indicated common band in the control information further
　said second transmission section is
　instructed by the control information than a threshold value used for determining whether a busy in the resource in the shared band, wherein when the interference power measured by the measurement unit is low, to claim 12, characterized in that for transmitting data of the wireless communication system.

[Claim 16]

　Each of said second communication apparatus,
　a measuring section that measures interference power in the resource in the indicated common band in the control information further
　wherein the second transmission unit,
　and the interference power, the control the ratio of the threshold value used for determining whether a busy in the resource in the shared band indicated by the information, and transmission power determined by multiplying the initial value of the transmission power, the higher of the minimum transmission power the wireless communication system according to claim 12, in the transmission power, and transmits the data.

[Claim 17]

　The determination unit,
　while from the second communication device is receiving the data using the resources in said shared bandwidth, the control information of the first transmission unit to the other of said second communication device when transmitting, the without determining resource is whether it is idle or busy in the shared band,
　the first transmission unit,
　the data using the resources in said shared bandwidth from the second communication device while receiving a case of transmitting the control information to the other of said second communication apparatus, the transmission of data without resource in said shared bandwidth makes a determination of which of the idle or busy a transmission instruction indicating to start further included in the control information,
　the second transmission unit,
　if the said contains transmission instruction to said control information, resources in the shared bandwidth instructed by the control information by using the Day The wireless communication system according to claim 12, wherein sending the.

[Claim 18]

　Each of said second communication apparatus
　further includes a measurement unit for measuring interference power in said shared bandwidth,
　the second transmission unit
　is busy and the interference power, in the resource in said shared bandwidth the ratio of whether threshold used to determine, to a transmission power determined by multiplying the initial value of the transmission power, at the higher transmission power of the minimum transmission power, and transmits the data the wireless communication system according to claim 17.

[Claim 19]

　Each of said second communication apparatus,
　a measuring section that measures interference power in the resource in the indicated common band in the control information further
　said second transmission section is
　instructed by the control information than a threshold value used for determining whether a busy in the resource in the shared band, according to claim 17, wherein the interference power measured by the measurement unit is lower, and transmits the data of the wireless communication system.

[Claim 20]

　Each of said second communication apparatus,
　a measuring section that measures interference power in the resource in the indicated common band in the control information further
　wherein the second transmission unit,
　and the interference power, the control the ratio of the threshold value used for determining whether a busy in the resource in the shared band indicated by the information, and transmission power determined by multiplying the initial value of the transmission power, the higher of the minimum transmission power the wireless communication system according to claim 17, in the transmission power, and transmits the data to.

[Claim 21]

　The second transmission unit,
　a wireless communication system of claim 20 wherein the interference power when it is below the threshold value, and transmits the data.

[Claim 22]

　Dedicated band of the wireless communication system only having a base station apparatus and a plurality of terminal devices, and, in each of the terminal device and the wireless the base station device that communicates with the shared bandwidth to be shared with other systems,
　the terminal device There transmitting unit that transmits to the terminal apparatus by using the control information for instructing the resource in the shared band, a resource in said dedicated band is used when transmitting data
　base station apparatus characterized by having a.

[Claim 23]

　Dedicated band of the wireless communication system only having a base station apparatus and a plurality of terminal devices, and, in the terminal apparatus which the base station apparatus and wireless communication using the shared bandwidth to be shared with other systems,
　in said shared bandwidth resource determination unit and determines whether it is idle or busy
　when the resources of said shared bandwidth is determined to be idle by the determination unit, the shared predetermined signal indicating the start of transmission of data after transmitting the bandwidth, a transmission unit for transmitting the data using the resources in the shared band instructed by the control information transmitted from the base station using the resource in said dedicated band
　has,
　the transmission parts are
　the when over resources in the shared band receives the predetermined signal from the other of said second communication apparatus, in said shared bandwidth by the determination unit Even if the source is determined to be busy, the terminal apparatus and transmits the data using the resources in the shared band instructed by the control information.