Communication apparatus, communication method and integrated circuit

Abstract

To provide a communication apparatus, a communication method and an integrated circuit that appropriately transmit and receive a signal in an application in a band in which license is not required (unlicensed band).SOLUTION: A communication apparatus comprises: a transmitter that transmits resource allocation information which instructs a set of one or more interlace numbers selected from a plurality of interlace numbers; and a receiver that receives an uplink signal in a first resource block within a band. When the resource allocation information instructs a set of two or more interlace numbers and the number of a second resource blocks instructed by the set of the two or more interlace numbers is different from an integer based on one or more specific prime numbers, the number of resource blocks in the first resource block is an integer based on the one or more specific prime numbers, and is a maximum integer which is less than or equal to the number of the second resource blocks.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a communication device, a communication method, and an integrated circuit. [Background technology]

[0002] A communication system called the fifth generation mobile communication system (5G) is being considered. The 3GPP (3rd Generation Partnership Project), an international standardization organization, is considering the advancement of the 5G communication system from the perspectives of both the advancement of the LTE (Long Term Evolution) and LTE-A (LTE-Advanced) systems and the advancement of the NR (NEW RAT (New Radio access technology)), a new method that is not necessarily backward compatible with LTE and LTE-A (e.g., Non-Patent Document 1).

[0003] In NR, in addition to licensed bands, operation in unlicensed bands is being considered, similar to LTE-LAA (License-Assisted Access) (for example, Non-Patent Document 2). Operation in unlicensed bands is also called, for example, NR-U (NR-based Access to Unlicensed Spectrum). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-90013 A [Non-patent literature]

[0005] [Non-Patent Document 1] RP-181726, “Revised WID on New Radio Access Technology” [Non-Patent Document 2] RP-181339, “Revised SID on NR-based Access to Unlicensed Spectrum” [Non-Patent Document 3] ETSI EN 301 893 V2.1.1 [Non-Patent Document 4] 3GPP TS 38.101-1 V15.3.0 [Non-Patent Document 5] “Block-Interleaved Frequency Division Multiple Access and its Application in the Uplink of Future Mobile Radio Systems”, T. Frank [Non-Patent Document 6] “LTE for 4G Mobile Broadband”, F. Khan [Non-Patent Document 7] 3GPP TS 38.211 V15.3.0 Summary of the Invention

[0006] However, in operating in unlicensed bands, the method of transmitting and receiving signals has not been fully considered.

[0007] Non-limiting embodiments of the present disclosure contribute to providing a communication device, a communication method, and an integrated circuit that can appropriately transmit and receive signals when operating in an unlicensed band.

[0008] A communication device according to one embodiment of the present disclosure comprises a transmitter that transmits resource allocation information indicating a set of one or more interlace numbers selected from a plurality of interlace numbers, and a receiver that receives an uplink signal in a first resource block within a band, and when the resource allocation information indicates a set of two or more interlace numbers, and when the number of second resource blocks indicated by the set of two or more interlace numbers is different from an integer based on one or more specific prime numbers, the number of resource blocks in the first resource block is an integer based on one or more specific prime numbers and is a maximum integer less than or equal to the number of the second resource blocks.

[0009] A communication method according to one embodiment of the present disclosure includes transmitting resource allocation information indicating a set of one or more interlace numbers selected from a plurality of interlace numbers, receiving an uplink signal in a first resource block in a band, and when the resource allocation information indicates a set of two or more interlace numbers, and when a number of second resource blocks indicated by the set of two or more interlace numbers is different from an integer based on one or more specific prime numbers, the number of resource blocks in the first resource block is an integer based on one or more specific prime numbers and is a maximum integer less than or equal to the number of second resource blocks.

[0010] An integrated circuit according to one embodiment of the present disclosure controls a process of transmitting resource allocation information indicating a set of one or more interlace numbers selected from a plurality of interlace numbers, and a process of receiving an uplink signal in a first resource block within a band, and when the resource allocation information indicates a set of two or more interlace numbers, and when the number of second resource blocks indicated by the set of two or more interlace numbers is different from an integer based on one or more specific prime numbers, the number of resource blocks in the first resource block is an integer based on one or more specific prime numbers and is a maximum integer less than or equal to the number of the second resource blocks.

[0011] A receiving method according to one embodiment of the present disclosure, when a first number representing an amount of first resources available for transmitting an uplink signal includes a third number different from a specific second number as a prime factor, sets a fourth number that does not include the third number as a prime factor, and controls reception of the fourth number of signals using the second resources.

[0012] A base station according to one embodiment of the present disclosure includes a receiving circuit for receiving an uplink signal, and a control circuit for determining a first resource usable for transmitting the uplink signal and controlling the receiving processing of the uplink signal in the first resource, the first resource having one or more bands located at a predetermined interval among a plurality of bands into which a predetermined frequency band is divided, and the control circuit sets the one or more bands to the first resource such that a number representing the amount of resources included in the first resource does not include a third number different from a specified second number as a prime factor.

[0013] A mobile station according to one embodiment of the present disclosure includes a transmission circuit for transmitting a signal, and a control circuit for controlling a transmission process of the signal using a first resource that is available, the first resource including one or more bands located at a predetermined interval among a plurality of bands into which a predetermined frequency band is divided, at least a portion of the plurality of bands having a bandwidth different from a remaining portion of the plurality of bands, and a number representing an amount of resources included in the first resource does not include a third number different from a specified second number as a prime factor.

[0014] These comprehensive or specific aspects may be realized as a system, an apparatus, a method, an integrated circuit, a computer program, or a recording medium, or may be realized as any combination of a system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium.

[0015] According to an embodiment of the present disclosure, signals can be appropriately transmitted and received when operating in unlicensed bands.

[0016] Further advantages and benefits of certain aspects of the present disclosure will become apparent from the specification and drawings, in which such advantages and / or benefits are provided by some of the embodiments and features described in the specification and drawings, respectively, but not necessarily all of which are provided to obtain one or more identical features. [Brief description of the drawings]

[0017] [Figure 1] Diagram showing an example of interlacing in LTE LAA [Diagram 2] Diagram showing an example of interlacing in NR-U [Diagram 3] FIG. 1 is a block diagram showing a configuration of a part of a base station according to a first embodiment; [Figure 4] FIG. 1 is a block diagram showing a configuration of a part of a mobile station according to a first embodiment; [Diagram 5] FIG. 1 is a block diagram showing a configuration of a base station according to a first embodiment. [Figure 6] FIG. 1 is a block diagram showing a configuration of a mobile station according to a first embodiment; [Figure 7] FIG. 1 is a diagram showing an example of an operation sequence between a base station and a mobile station according to the first embodiment. [Figure 8] A diagram showing an example of allocated resources [Figure 9] Another example of interlacing in NR-U [Figure 10] FIG. 13 is a diagram showing an example of an interlace configuration according to another embodiment 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0019] As mentioned above, operation of the NR system is being considered in unlicensed bands (e.g., frequency bands below 7 GHz).

[0020] In unlicensed bands, the upper limit of power spectral density (hereinafter, sometimes referred to as PSD) is restricted by laws, regulations, standards, etc. For example, according to the standard of ETSI (European Telecommunications Standards Institute) (e.g., Non-Patent Document 3), the upper limit of PSD in the band called 5 GHz is restricted to, for example, 10 dBm / MHz (17 dBm / MHz in some bands) even for terminals with power control functions.

[0021] In order to transmit signals with higher transmission power under the PSD limit, it is effective to allocate resources by spreading them in the frequency domain. Therefore, an allocation method called interlace allocation is being considered for NR-U.

[0022] According to an allocation technique called interlace allocation, a certain band (e.g., 20 MHz) is divided into multiple interlaces. An interlace has, for example, multiple consecutive subcarrier groups. One consecutive subcarrier group corresponds to, for example, one physical resource block (hereinafter, sometimes referred to as PRB). The multiple consecutive subcarrier groups are arranged at equal or uneven intervals in the frequency domain. In other words, an interlace has multiple PRBs arranged at equal or uneven intervals in the frequency domain.

[0023] For example, different interlaces have different resources, i.e., resources do not overlap between different interlaces, and different identifiers are assigned to different interlaces. The identifiers assigned to the interlaces may be referred to as interlace numbers.

[0024] An allocation method called interlace allocation is used, for example, in the uplink. A base station (which may also be called, for example, Base Station, Node B, or gNB) may notify a mobile station (which may also be called, for example, a terminal or User Equipment (UE)) of one or more interlace numbers. In this case, the mobile station may allocate a signal to a resource corresponding to the notified interlace number and transmit the signal.

[0025] Fig. 1 is a diagram showing an example of interlaces in LTE LAA. In the example of Fig. 1, a 20 MHz band is divided into 10 interlaces. The 10 interlaces are numbered 0 to 9. In the following, an interlace numbered i (i is an integer equal to or greater than 0) may be referred to as interlace #i.

[0026] Each interlace has PRBs that are equally spaced in the frequency domain. The number in each PRB indicates the number of the interlace. Interlaces with different numbers do not have the same PRB.

[0027] In NR, the maximum number of PRBs to be allocated in a 20 MHz band included in a frequency band lower than 6 GHz is considered to be 106, 51, and 24 for subcarrier spacings (hereinafter sometimes referred to as SCS) of 15 kHz, 30 kHz, and 60 kHz, respectively (for example, Non-Patent Document 4). The maximum number of PRBs to be allocated under NR is a different value from the maximum number of PRBs to be allocated in LTE (i.e., 100).

[0028] In an NR system in an unlicensed band (e.g., a frequency band lower than 7 GHz), the interlace configuration is being considered based on the maximum number of PRB allocations described above.

[0029] For example, in 3GPP, a 20 MHz band is divided into M interlaces, and each of the M interlaces is defined to have N PRBs. M and N are examples of parameters indicating the configuration of an interlace. If the maximum number of PRBs allocated is not a multiple of M, it is considered that the number of PRBs in one interlace is one greater than the number of PRBs in another interlace.

[0030] For example, when the subcarrier spacing is 15 kHz, M is considered to be 12. When the subcarrier spacing is 15 kHz, the maximum number of PRBs allocated is 106, which is not a multiple of M=12. Therefore, when the subcarrier spacing is 15 kHz and M is 12, it is considered that one interlace has 9 PRBs and another interlace has 8 PRBs.

[0031] In the uplink, a mobile station may apply DFT (Discrete Fourier Transform) processing to a signal to be transmitted in order to suppress the PAPR (Peak to Average Power Ratio) of the transmitted signal (for example, Non-Patent Document 5). In this case, the mobile station may map the signal after DFT processing to interlace resources. In addition, when the mobile station transmits a signal after DFT processing, the base station may apply IDFT (Inverse Discrete Fourier Transform) processing in the receiving process.

[0032] In a DFT process using a Fast Fourier Transform (FFT), it is known that the amount of calculations is reduced when the DFT size can be factorized into relatively small prime numbers (for example, Non-Patent Document 6). The DFT size corresponds to, for example, the number of outputs after the DFT process. In addition, in an IDFT process using an Inverse Fast Fourier Transform (IFFT), it is known that the amount of calculations is reduced when the IDFT size, which is the same as the DFT size, can be factorized into relatively small prime numbers. Therefore, in the uplink of the NR system, when a DFT-S-OFDM (DFT-Spread-Orthogonal Frequency Division Multiplexing) signal waveform is used, an example of a condition is specified that the number of subcarriers assigned to a mobile station is a number having at least one prime factor of 2, 3, and 5 (for example, Non-Patent Document 7). In other words, a condition is specified that the number of subcarriers assigned to a mobile station does not include a prime factor other than 2, 3, and 5.

[0033] In LTE LAA, which operates the LTE system in an unlicensed band, the combination of the numbers M and N, which indicate the interlace configuration, is (M,N)=(10,10) or (M,N)=(10,5), so the number of PRBs assigned to a mobile station is a multiple of 10. In other words, the number of subcarriers assigned is a multiple of 120. Here, since 120 does not contain any prime factor different from 2, 3, and 5, it is relatively easy to satisfy the above-mentioned condition in LTE LAA.

[0034] In the interlace configuration under consideration for NR-U, the number of allocated subcarriers may include prime factors other than 2, 3, and 5. We will explain this by taking an example where the subcarrier spacing is 15 kHz and the combination of the numbers M and N that indicate the interlace configuration is (M, N) = (12, 8 or 9).

[0035] In addition, the combination of M and N indicating the interlace configuration in the NR-U considerations is not limited to (M,N)=(12,8or9). For example, when the subcarrier spacing is 15kHz, the combination of the numbers M and N indicating the interlace configuration may be (M,N)=(10,10or11), or (M,N)=(8,13or14). In addition, when the subcarrier spacing is 30kHz, the combination of the numbers M and N indicating the interlace configuration may be (M,N)=(6,8or9), (M,N)=(5,10or11), or (M,N)=(4,12or13). In addition, when the subcarrier spacing is 60kHz, the combination of the numbers M and N indicating the interlace configuration may be (M,N)=(4,6), (M,N)=(3,8), or (M,N)=(2,12). In addition, when the subcarrier spacing is 60 kHz and 26 PRBs are included in a 20 MHz bandwidth, the combination of the numbers M and N indicating the interlace configuration may be (M,N)=(4,6or7), (M,N)=(2,13), or (M,N)=(3,8or9).

[0036] Fig. 2 is a diagram showing an example of interlaces in NR-U. In the example of Fig. 2, an interlace with N=8 (i.e., an interlace with 8 PRBs) and an interlace with N=9 (i.e., an interlace with 9 PRBs) may be assigned to a mobile station.

[0037] For example, when one interlace of N=8 and one interlace of N=9 are assigned to a mobile station, the number of PRBs assigned to the mobile station is 17, that is, the number of subcarriers assigned to the mobile station is 204. Since 204 includes a relatively large prime factor of 17, when the mobile station performs DFT processing of a signal to be mapped to 204 subcarriers, the amount of calculation for the DFT processing may increase. Also, when the base station performs IDFT processing of a signal mapped to 204 subcarriers by the mobile station, the amount of calculation for the IDFT processing may increase as in the case of DFT processing.

[0038] This disclosure describes an example of a technique that enables efficient use of resources without increasing the amount of calculation for DFT processing and IDFT processing corresponding to the DFT processing.

[0039] (Embodiment 1) [Communication system overview] A communication system according to an embodiment of the present disclosure includes a base station 100 and a mobile station 200. In the following description, as an example, the base station 100 determines resources to be allocated to the mobile station 200 and notifies the mobile station 200 of information indicating the determined resources. Then, based on the notification, the mobile station 200 performs a signal transmission process including a mapping process to the resources, and transmits the signal to the base station 100.

[0040] Fig. 3 is a block diagram showing a configuration of a part of the base station 100 according to the first embodiment of the present disclosure. In the base station 100 shown in Fig. 3, the receiving unit 106 receives an uplink signal, and the control unit 101 controls reception of a signal of a fourth number using the second resource and not including the third number in its prime factors when a first number indicating an amount of a first resource available for transmitting the uplink signal includes a third number different from a specific second number in its prime factors.

[0041] Fig. 4 is a block diagram showing a configuration of a part of mobile station 200 according to embodiment 1 of the present disclosure. In mobile station 200 shown in Fig. 4, transmitter 205 transmits an uplink signal, and controller 201 controls transmission of a signal of a fourth number using the second resource and not including the third number in its prime factors when a first number indicating an amount of first resources available for transmitting the uplink signal includes a third number different from a specific second number in its prime factors.

[0042] [Base station configuration] FIG. 5 is a block diagram showing a configuration of base station 100 according to the first embodiment.

[0043] In FIG. 5 , base station 100 includes a control unit 101, an encoding / modulation unit 102, a signal allocation unit 103, a transmitting unit 104, an antenna 105, a receiving unit 106, a signal separating unit 107, an IDFT (Inverse Discrete Fourier Transform) unit 108, and a demodulating / decoding unit 109.

[0044] The control unit 101, for example, schedules the uplink and determines resources to be allocated to the mobile station 200. The control unit 101 outputs allocation resource information (for example, the number of an interlace to be allocated to the uplink transmission of the mobile station 200) to the coding and modulation unit 102 and the signal allocation unit 103. The allocation resource information output to the signal allocation unit 103 may be included in, for example, DCI (Downlink Control Information). The allocation resource information output to the coding and modulation unit 102 may be included in, for example, a higher layer signal.

[0045] When the number indicating the amount of resources allocated to the mobile station 200 includes a prime factor different from a specific number, the control unit 101 controls the receiving process on the assumption that the resources to which the uplink signal received from the mobile station 200 is mapped are different from the resources allocated to the mobile station 200.

[0046] In the following, an example will be described in which the uplink signal is a data signal including uplink data, but the uplink signal in the present disclosure may include a signal different from the data signal.

[0047] Here, the number indicating the amount of resources is, for example, the number of subcarriers included in the resources. Also, the specific number is, for example, a relatively small prime number such as 2, 3, and 5. Also, the resource to which the data signal is mapped is different from the allocated resource, for example, corresponds to the number and / or position of the subcarriers to which the data signal is mapped being different from the number and / or position of the allocated subcarriers. Also, the resource to which the data signal is mapped is different from the allocated resource may include the number of data signals to be received being different from the number of data signals receivable in the allocated resource.

[0048] The number indicating the amount of resources is not limited to the number of subcarriers. The number indicating the amount of resources may be, for example, the number of subcarrier groups or the number of PRBs. The specific number is not limited to 2, 3, and 5. The specific number may include prime numbers other than 2, 3, and 5, or at least one of 2, 3, and 5 may be excluded.

[0049] For example, when the number of allocated subcarriers includes a prime factor different from a specific number, the control unit 101 may change at least one of the number of subcarriers to which the data signals are mapped, the positions, and the number of data signals to a value different from the allocated resources. For example, the control unit 101 may change at least one of the number of subcarriers, the positions, and the number of data signals included in the allocation resource information. The information after the change indicates the resources to which the data signals are allocated and / or the number of uplink data signals transmitted by the mobile station 200. Also, for example, the number of data signals after the change may be the number of data signals output from the IDFT unit 108. Hereinafter, the information after the change may be described as allocation resource information. The control unit 101 outputs the allocation resource information to the signal separation unit 107. Also, the control unit 101 outputs information regarding the number of uplink data signals to the IDFT unit 108.

[0050] The coding and modulation unit 102 receives an upper layer signal as input, performs error correction coding and modulation on the input upper layer signal, and outputs the signal after error correction coding and modulation to the signal allocation unit 103.

[0051] The signal allocation unit 103 allocates (maps) the signal obtained from the coding and modulation unit 102 and / or the DCI obtained from the control unit 101 to resources defined in the time domain and the frequency domain. The signal allocation unit 103 outputs the allocated signal to the transmission unit 104.

[0052] The transmitting unit 104 performs radio transmission processing such as frequency conversion (for example, up-conversion) using a carrier wave on the signal received from the signal allocating unit 103, and outputs the signal after radio transmission processing to the antenna 105.

[0053] The antenna 105 radiates the signal (downlink signal) received from the transmitter 104 to the mobile station 200. The antenna 105 receives the uplink signal transmitted by the mobile station 200, and outputs the received uplink signal to the receiver .

[0054] Receiving section 106 performs radio reception processing such as frequency conversion (for example, down-conversion) of the signal received from antenna 105, and outputs the signal after radio reception processing to signal separating section 107.

[0055] The signal separation unit 107 extracts a data signal included in the signal received from the receiving unit 106 based on the allocation resource information received from the control unit 101. For example, the signal separation unit 107 identifies the position of a resource defined in the time domain and the frequency domain based on the allocation resource information, and extracts a data signal mapped to the identified position. The signal separation unit 107 outputs the extracted data signal to the IDFT unit 108.

[0056] IDFT unit 108 performs IDFT processing (for example, IFFT processing) on ​​the data signal received from signal separation unit 107. IDFT unit 108 outputs the data signal after IDFT processing to demodulation and decoding unit 109. Note that if the number of data signals received from signal separation unit 107 is different from the number of data signals indicated by the information received from control unit 101, IDFT unit 108 may perform signal interpolation processing or signal thinning processing in the IDFT processing. In that case, the number of signals output from IDFT unit 108 may be the number of data signals indicated by the information received from control unit 101.

[0057] The demodulation / decoding unit 109 demodulates and decodes the data signal received from the IDFT unit 108 .

[0058] [Mobile station configuration] FIG. 6 is a block diagram showing a configuration of mobile station 200 according to the first embodiment.

[0059] 6, mobile station 200 has a control unit 201, an encoding / modulation unit 202, a DFT unit 203, a signal allocation unit 204, a transmitting unit 205, an antenna 206, a receiving unit 207, a signal separating unit 208, and a demodulating / decoding unit 209.

[0060] The control unit 201 obtains information indicating uplink resources allocated to the mobile station 200 by the base station 100 (for example, the above-mentioned allocation resource information) and controls the transmission process of the uplink signal. For example, the control unit 201 outputs the information indicating the uplink resources allocated to the mobile station 200 to the coding and modulation unit 202 and / or the signal allocation unit 204 based on the DCI received from the signal separation unit 208 and / or the higher layer signal received from the demodulation and decoding unit 209.

[0061] For example, when a number indicating the amount of resources allocated to mobile station 200 includes a prime factor different from a specific number, control unit 201 controls the transmission process assuming that the resources allocated to mobile station 200 are different from the resources to which the data signal is mapped.

[0062] For example, when the number of allocated subcarriers includes a prime factor different from a specific number, the control unit 201 may change at least one of the number of subcarriers, the position, and the number of data signals to which the data signals are mapped, to a value different from the allocated resource. For example, the control unit 201 may change at least one of the number of subcarriers, the position, and the number of data signals included in the allocation resource information. The information after the change (the above-mentioned allocation resource information) indicates the resource to which the data signals are allocated (mapped) and / or the number of uplink data signals to be transmitted. Also, for example, the number of data signals after the change may be the number of data signals output from the DFT unit 203 or the number of data signals input to the DFT unit 203. The control unit 201 outputs the allocation resource information to the signal allocation unit 204. Also, the control unit 201 outputs information regarding the number of uplink data signals to the coding and modulation unit 202.

[0063] The antenna 206 receives a downlink signal transmitted by the base station 100, and outputs the downlink signal to the receiving unit 207. The antenna 206 radiates the uplink signal received from the transmitting unit 205 to the base station 100.

[0064] The receiving section 207 performs radio reception processing such as frequency conversion (for example, down-conversion) of the signal received from the antenna 206 , and outputs the signal after the radio reception processing to the signal separating section 208 .

[0065] The signal separator 208 extracts a downlink data signal and / or control information (e.g., DCI) and the like included in the downlink signal received from the receiver 207. For example, the signal separator 208 identifies the position of a resource in which the downlink data signal and / or the control information is arranged, and extracts the downlink data signal and / or the control information mapped to the identified position. The signal separator 208 outputs the downlink data signal to the demodulator / decoder 209, and outputs the control information to the controller 201.

[0066] The demodulation and decoding unit 209 demodulates and decodes the downlink data signal received from the signal separation unit 208. The demodulation and decoding unit 209 outputs the signal obtained by decoding (upper layer signal) to the control unit 201.

[0067] Based on information relating to the number of data signals received from the control unit 201 , the coding and modulation unit 202 performs error correction coding and modulation on the uplink data, and outputs the result to the DFT unit 203 .

[0068] The DFT unit 203 performs DFT processing (for example, FFT processing) on ​​the signal received from the encoding / modulation unit 202 and outputs a data signal to the signal allocation unit 204 .

[0069] The signal allocation unit 204 allocates the data signal received from the DFT unit 203 in the time-frequency domain based on the resource allocation information received from the control unit 201. The signal allocation unit 204 outputs the allocated signal to the transmission unit.

[0070] The transmitting unit 205 performs radio transmission processing such as frequency conversion (for example, up-conversion) using a carrier wave on the signal received from the signal allocating unit 204 , and outputs the signal to the antenna 206 .

[0071] Next, an example of an operation sequence between the base station 100 and the mobile station 200 will be described.

[0072] FIG. 7 is a diagram showing an example of an operation sequence between base station 100 and mobile station 200 according to the first embodiment.

[0073] In the following, the resources allocated by the base station 100 to the mobile station 200 may be referred to as "allocated resources". Furthermore, the resources to which the mobile station 200 maps the uplink data signal may be referred to as "allocated resources". Furthermore, when resources are represented by subcarriers, the allocated resources and the allocated resources may be replaced with "allocated subcarriers" and "allocated subcarriers", respectively.

[0074] Base station 100 determines one or more interlace numbers to be assigned to mobile station 200 (ST101).

[0075] Base station 100 notifies mobile station 200 of information including the determined interlace number (allocation resource information) using higher layer signaling and / or DCI (ST102).

[0076] Mobile station 200 determines whether the number of subcarriers to be allocated, determined based on the notification, has a prime factor different from a specific number (ST103).

[0077] If the number of allocated subcarriers does not have a prime factor different from the specific number (NO in ST103), mobile station 200 performs the process in ST105.

[0078] If the number of allocated subcarriers has a prime factor different from the specific number (YES in ST103), mobile station 200 adjusts the size of the data signal to be transmitted and / or the resource on which the data signal is mapped (ST104). The adjustment of the size of the data signal to be transmitted may be, for example, an adjustment (change) of the number of data signals to be transmitted. Furthermore, the adjustment of the resource on which the data signal is mapped may be, for example, an adjustment (change) of the amount of resources on which the data signal is mapped and / or the position of the resources. Furthermore, as described above, the resource on which the data signal is mapped may correspond to the allocation resource. Then, mobile station 200 performs the process of ST105.

[0079] Mobile station 200 maps data signals to resources (ST105).

[0080] After the processing in ST102, base station 100 determines whether or not the number of allocated subcarriers has a prime factor different from a specific number (ST106).

[0081] If the number of allocated subcarriers does not have a prime factor different from a specific number (NO in ST106), base station 100 performs reception processing in ST108.

[0082] If the number of allocated subcarriers has a prime factor different from the specific number (YES in ST106), base station 100 adjusts the size of the received data signal and / or the resource to which the received data signal is mapped (ST107). The adjustment of the size of the received data signal may be, for example, an adjustment (change) of the number of received data signals. Furthermore, the adjustment of the resource to which the data signal is mapped may be, for example, an adjustment (change) of the amount of resources to which the data signal is mapped and / or the position of the resource. Furthermore, as described above, the resource to which the data signal is mapped may correspond to the allocation resource. Then, base station 100 performs the reception process of ST108.

[0083] The mobile station 200 transmits an uplink signal, and the base station 100 receives the uplink signal (ST 108).

[0084] 7 shows an example in which base station 100 performs the process of ST106 after ST102, and the process of ST107 if YES in ST106, but base station 100 may perform the process of ST106 between ST101 and ST102, and the process of ST107 if YES in ST106. In this case, base station 100 may notify mobile station 200 of information after the adjustment in ST107 (e.g., allocation resource information) using higher layer signaling and / or DCI in ST102. In this case, mobile station 200 does not need to perform the processes in ST103 and ST104.

[0085] Next, an example of setting resources that the base station 100 allocates to the mobile station 200 and an example of setting resources to which the mobile station 200 maps a data signal will be described.

[0086] [First example of allocation and placement resources] An example of how the base station determines the resources to be allocated to the mobile station 200 and how the mobile station 200 determines the resources to which the data signal is mapped will be described below using an example in which the subcarrier spacing is 15 kHz, the interlace configuration is M=10, and N=8 or 9.

[0087] For example, when the subcarrier spacing is 15 kHz, M=10, and N=8 or 9, the interlace configuration has the configuration shown in FIG.

[0088] In the configuration shown in FIG. 2, control unit 101 determines the numbers of one or more interlaces, and determines resources (for example, PRBs) corresponding to the determined interlace numbers as allocation resources.

[0089] Fig. 8 is a diagram showing an example of allocated resources. In the example of Fig. 8, interlace #0 and interlace #10 are allocated to mobile station 200. Interlace #0 is an interlace with N=9 (i.e., an interlace having 9 PRBs), and interlace #10 is an interlace with N=8 (i.e., an interlace having 8 PRBs).

[0090] In this case, base station 100 notifies mobile station 200 of allocation resource information indicating that the allocated resources are interlaces #0 and #10, using DCI and / or higher layer signaling.

[0091] Control unit 201 of mobile station 200 determines that the allocated resources are interlaces #0 and #10 based on the acquired allocated resource information. Then, control unit 201 determines the amount of resources of the allocated resources. For example, when the amount of resources is represented by the number of subcarriers, control unit 201 determines the number of allocated subcarriers. For example, since the number of PRBs in interlace #0 is 9, the number of PRBs in interlace #10 is 8, and one PRB has 12 subcarriers, control unit 201 determines that the number of allocated subcarriers is 204.

[0092] Then, the control unit 201 determines whether the number of assigned subcarriers includes a prime factor different from the specific number. For example, when the specific number is 2, 3, and 5, the number of assigned subcarriers is 204=2×2×3×17, so the control unit 201 determines that the number of assigned subcarriers includes 17, which is a prime factor different from 2, 3, and 5.

[0093] In this case, the control unit 201 may change at least one of the number of allocated subcarriers, the positions, and the number of data signals to a value different from that in the resource allocation information.

[0094] For example, the control unit 201 may set any number that is equal to or less than the number of allocated subcarriers (or less than the number of allocated subcarriers) and does not contain a prime factor different from a specific number (i.e., a number whose prime factors include only a specific number) to the number of data signals output from the DFT unit 203. In conjunction with this, the control unit 201 may set the number of allocated subcarriers to the same number as the number of set data signals.

[0095] For example, the maximum number among numbers that is equal to or less than the number of allocated subcarriers and does not include a prime factor different from a specific number may be set as the number of data signals and the number of allocated subcarriers.

[0096] In the above example, the number of allocated subcarriers is 204, and the specific numbers are 2, 3, and 5. In this case, the largest number among the numbers that is equal to or less than the number of allocated subcarriers and does not contain a prime factor different from the specific numbers is 200 (=2 3 x5 2 ).

[0097] In this case, the control unit 201 sets the number of data signals and the number of allocated subcarriers to 200.

[0098] The control unit 201 may set the number of data signals and the number of allocated subcarriers to a number that is equal to or less than the number of allocated subcarriers and is smaller than the maximum number among numbers that do not include a prime factor different from a specific number. For example, the control unit 201 may set the number of data signals and the number of allocated subcarriers to 180 (=2 2 ×3 2 ×5), or 150 (=2×3×5) 2 ) may be set.

[0099] Then, the control unit 201 sets the positions of the allocated subcarriers among the allocated subcarriers. The method of setting the positions of the allocated subcarriers is not particularly limited. For example, any of the setting methods 1 to 5 described below may be applied.

[0100] <Setting method 1> For example, the control unit 201 may set the subcarriers on the higher frequency side of the allocated subcarriers as the allocated subcarriers. In the above example, of the 204 subcarriers, the 200 subcarriers located on the higher frequency side are set as the allocated subcarriers, and the four subcarriers located on the lower frequency side are not set as the allocated subcarriers. In other words, the four subcarriers located on the lower frequency side are excluded.

[0101] <Setting method 2> For example, the control unit 201 may set the subcarriers on the low frequency side of the allocated subcarriers as the allocated subcarriers. In the above example, of the 204 subcarriers, 200 subcarriers located on the low frequency side are set as the allocated subcarriers, and the 4 subcarriers located on the high frequency side are not set as the allocated subcarriers.

[0102] <Setting method 3> For example, the control unit 201 may set the allocated subcarriers, excluding the low-frequency side and the high-frequency side, as the allocated subcarriers. In the above example, of the 204 subcarriers, 200 subcarriers, excluding the two subcarriers located on the high-frequency side and the two subcarriers located on the low-frequency side, are set as the allocated subcarriers. Note that the number of subcarriers to be excluded on the high-frequency side and the low-frequency side is not limited. For example, in the above example, one subcarrier located on the high-frequency side and three subcarriers located on the low-frequency side may be excluded.

[0103] In the setting method 1 to the setting method 3, the allocation subcarriers are set on at least one of the low frequency side and the high frequency side of the allocated subcarriers. With this method, the frequency interval of the PRB of the allocation resource is kept uniform, and the deterioration of the PAPR of the uplink signal can be suppressed. In addition, the interference from the adjacent band can be suppressed on the side where the allocation resource (allocation subcarrier) is not set.

[0104] <Setting method 4> For example, the control unit 201 may set the subcarriers excluding the subcarriers located in the central part of the allocated subcarriers as the allocated subcarriers. The subcarriers located in the central part may be, for example, any of the subcarriers different from the subcarriers on the high frequency side and the low frequency side. In other words, when the subcarriers excluding the subcarriers located in the central part of the allocated subcarriers are set as the allocated subcarriers, the maximum frequency and the minimum frequency of the allocated subcarriers are not changed from the allocated subcarriers.

[0105] In setting method 4, subcarriers other than those located in the center of the allocated subcarriers are set as allocated subcarriers. This method reduces the possibility of violating the OCB restrictions defined by ETSI, since the occupied channel bandwidth (OCB) of the allocated subcarriers is not narrower than the bandwidth of the allocated subcarriers.

[0106] <Setting method 5> For example, the control unit 201 may set subcarriers, excluding subcarriers included in a specific interlace, of the allocated subcarriers as allocation subcarriers. In the above example, of the 108 subcarriers included in interlace #0 and the 96 subcarriers included in interlace #10, subcarriers excluding the 4 subcarriers included in interlace #0 may be set as allocation subcarriers. Alternatively, subcarriers excluding the 4 subcarriers included in interlace #10 may be set as allocation subcarriers. In this case, the method of selecting the specific interlace from which the subcarriers are removed is not particularly limited. For example, an interlace that has a smaller number of subcarriers included before the removal may be preferentially selected. In the above example, of the 108 subcarriers included in interlace #0 and the 96 subcarriers included in interlace #10, the 4 subcarriers included in interlace #10 may be preferentially removed, and the remaining subcarriers may be set as allocation subcarriers.

[0107] In the setting method 5, the occupied bandwidth (OCB) of the allocated subcarriers can be secured by the interlace to which the excluded subcarriers do not belong, so that the possibility of violating the OCB restrictions defined by ETSI is low. For example, the possibility of violating the OCB restrictions defined by ETSI can be further reduced by selecting an interlace that contains fewer subcarriers before the exclusion for a specific interlace from which the subcarriers are excluded. In addition, the frequency interval of the PRB of the allocation resource can be kept uniform, suppressing the deterioration of the PAPR of the uplink signal.

[0108] The control unit 201 determines the number and positions of allocated subcarriers, and outputs allocation resource information including information indicating the determined number and positions of subcarriers to the signal allocation unit 204. In addition, the control unit 201 outputs the number of uplink data signals to the coding and modulation unit 202.

[0109] The coding and modulation unit 202 performs error correction coding and modulation on the uplink data based on the number of data signals, and outputs the data to the DFT unit 203. The DFT unit 203 performs DFT processing (e.g., FFT processing) on ​​the signal of the number of data signals received from the coding and modulation unit 202, and outputs the output signal to the signal allocation unit 204. Here, since the number of data signals is a number that does not include prime factors different from a specific number (2, 3, and 5 in the above example), it is possible to suppress an increase in the amount of calculation of the DFT processing (e.g., FFT processing) in the DFT unit 203, and to speed up the DFT processing.

[0110] Based on the positions of the allocated subcarriers, the signal allocation unit 204 maps the signals received from the DFT unit 203. In this case, the signal allocation unit 204 does not need to map signals to subcarriers other than the allocated subcarriers.

[0111] Similarly to the control unit 201 of the mobile station 200, the control unit 101 of the base station 100 may change at least one of the number of allocated subcarriers, the positions, and the number of data signals to a value different from the allocated resource information. Information on the change method may be shared between the mobile station 200 and the base station 100. In this case, the mobile station 200 and the base station 100 may change at least one of the number of allocated subcarriers, the positions, and the number of data signals to a value different from the allocated resource information based on the same change method.

[0112] For example, the IDFT unit 108 performs IDFT processing (e.g., FFT processing) on ​​the signal of the number of data signals received from the signal separation unit 107, and outputs the processed signal to the demodulation and decoding unit 109. Here, the number of data signals is a number that does not include prime factors different from a specific number (2, 3, and 5 in the above example), so that it is possible to suppress an increase in the amount of calculation of the IDFT processing (e.g., IFFT processing) in the IDFT unit 108, and to speed up the IDFT processing.

[0113] In the above-described example, the number of data signals and allocation resources is determined in units of subcarriers, thereby improving the frequency utilization efficiency of the allocated resources and enabling flexible mapping of data signals. For example, a signal different from the uplink data signal may be mapped to a resource that is not set as an allocation resource.

[0114] In addition, the unit of the number of data signals and allocation resources is not limited to subcarrier units. For example, the number of data signals and allocation resources may be determined in sub-PRB units having a number of subcarriers less than PRB (i.e., less than 12 subcarriers). Sub-PRB may be called a part of PRB, or may be considered to correspond to another name.

[0115] Alternatively, the number of data signals and configuration resources may be determined on a PRB basis. The following describes a second example in which the number of data signals and configuration resources is determined on a PRB basis.

[0116] [Second example of allocation and placement resources] When the number of data signals and allocation resources is determined in units of PRB, the control unit 201 determines one of the numbers that is equal to or less than the number of allocated subcarriers and does not contain a prime factor different from a specific number, and is K times 12 (K is an integer equal to or greater than 1). Here, 12 is the number of subcarriers included in one PRB. Then, the control unit 201 sets K, which corresponds to the determined number, as the number of PRBs in the allocation resource.

[0117] For example, as in the example described above, when determining the allocation resource for the allocation resource shown in FIG. 8, the control unit 201 sets K=16, K times 12=192 as the number of data signals, and K=16 as the number of PRBs in the allocation resource.

[0118] Then, the control unit 201 determines the positions of the allocation resources corresponding to the number of PRBs of the set allocation resources.

[0119] The position of the allocation resource may be the PRB on the high frequency side among the allocation resources in the PRB unit, as in the setting method 1 when setting in the subcarrier unit. Alternatively, the position of the allocation resource may be the PRB on the low frequency side among the allocation resources in the PRB unit, as in the setting method 2 when setting in the subcarrier unit.

[0120] For example, in the example of Fig. 8, when the number of PRBs in the configuration resource is set to 16, the control unit 201 may set 16 PRBs excluding the PRB of the lowest frequency included in interlace #0 as the PRBs in the configuration resource. Alternatively, the control unit 201 may set 16 PRBs excluding the PRB of the highest frequency included in interlace #0 as the PRBs in the configuration resource.

[0121] Also, the position of the allocation resource may be any of the PRBs excluding the PRBs on the high frequency side and the PRBs on the low frequency side among the allocation resources in the PRB unit, as in the setting method 3 when setting in subcarrier units. Also, the position of the allocation resource may be any of the PRBs excluding the PRBs in the center part among the allocation resources in the PRB unit, as in the setting method 4 when setting in subcarrier units. The PRBs in the center part may be, for example, any of the PRBs on the high frequency side and the PRBs on the low frequency side. Also, the position of the allocation resource may be any of the PRBs excluding the PRBs included in a specific interlace among the allocation resources in the PRB unit, as in the setting method 5 when setting in subcarrier units.

[0122] When determining allocation resources on a PRB-by-PRB basis, the frequency intervals of the PRBs of the allocated resources are kept uniform, as in the case of determining allocation resources on a subcarrier-by-subcarrier basis, and degradation of the PAPR of the data signal can be suppressed. In addition, interference from adjacent bands on the side where allocation resources are not set can be suppressed.

[0123] When allocation resources are determined in PRB units, the resources used for transmission in mobile station 200 are determined in PRB units, which makes it easy to implement in mobile station 200 and base station 100.

[0124] As described above, in the first embodiment, data signals in the same number as the number of allocated subcarriers are mapped in a one-to-one correspondence to allocated subcarriers in a number that does not include a prime factor different from a specific number (in the above example, 2, 3, and 5) from among the allocated subcarriers. This makes it possible to suppress an increase in the amount of calculation for the DFT process and the IDFT process corresponding to the DFT process, and to use resources efficiently, so that signals can be appropriately transmitted and received when operating in an unlicensed band.

[0125] (Embodiment 2) In the first embodiment, an example has been described in which the number of uplink data signals and allocation resources are determined for the allocation resources, and the data signals are mapped one-to-one to the same amount of allocation resources as the amount of data signals. In the second embodiment, an example will be described in which a mapping method of uplink data signals for the allocation resources is changed.

[0126] The outline of the communication system according to the second embodiment, the configuration of the base station, the configuration of the mobile station, and the operation sequence are the same as those in the first embodiment, and therefore detailed description will be omitted. In the following, the second embodiment will be described by using the outline of the communication system, the configuration of the base station, and the configuration of the mobile station shown in the first embodiment.

[0127] In the second embodiment, similarly to the first embodiment, for example, when a number indicating the amount of resources allocated to the mobile station 200 includes a prime factor different from a specific number, the control unit 201 controls the transmission process under the assumption that the resources allocated to the mobile station 200 and the resources to which an uplink data signal is mapped are different.

[0128] For example, if the number of assigned subcarriers includes a prime factor different from a specific number, the control unit 201 may change at least one of the number, position, and number of data signals of the subcarriers to which the data signals are mapped to a value different from the assigned subcarriers.

[0129] For example, the control unit 201 sets the number of data signals, and also sets the number of allocated subcarriers to which the data signals are mapped in one-to-one correspondence among the allocated subcarriers. In this case, the control unit 201 sets the number of allocated subcarriers to the same number as the number of data signals. As described above, the number of data signals set by the control unit 201 corresponds to the number of data signals output from the DFT unit 203.

[0130] Then, the control unit 201 sets subcarriers onto which the data signal is repeatedly mapped. The subcarriers onto which the data signal is repeatedly mapped are, for example, at least a part of the subcarriers excluding the allocated subcarriers among the allocated subcarriers. The subcarriers onto which the data signal is repeatedly mapped are sometimes referred to as redundantly allocated subcarriers.

[0131] In this case, the data signals mapped to the allocation subcarriers do not overlap with each other. On the other hand, the data signals mapped to the overlapped allocation subcarriers overlap with any of the data signals mapped to the allocation subcarriers. In other words, the data signals mapped to the allocation subcarriers are repeatedly mapped to the overlapped allocation subcarriers.

[0132] An example of the second embodiment will be described with reference to the example of Fig. 8. For example, when the allocated resources shown in Fig. 8 are allocated to mobile station 200, control unit 201 determines that the allocated resources are interlaces #0 and #10. Then, control unit 201 determines that the number of allocated subcarriers is 204.

[0133] Then, the control unit 201 determines whether the number of assigned subcarriers includes a prime factor different from the specific number. For example, when the specific number is 2, 3, and 5, the number of assigned subcarriers is 204=2×2×3×17, so the control unit 201 determines that the number of assigned subcarriers includes 17, which is a prime factor different from 2, 3, and 5.

[0134] In this case, the control unit 201 according to the second embodiment may set the number of data signals and the number of allocated subcarriers to any number that is less than or equal to the number of allocated subcarriers and does not contain a prime factor different from a specific number (i.e., a number whose prime factors include only the specific number).

[0135] For example, the maximum number among numbers that is equal to or less than the number of allocated subcarriers and does not include a prime factor different from a specific number may be set as the number of data signals and the number of allocated subcarriers.

[0136] In the above example, the number of allocated subcarriers is 204, and the specific numbers are 2, 3, and 5. In this case, the largest number among the numbers that is equal to or less than the number of allocated subcarriers and does not contain a prime factor different from the specific numbers is 200 (=2 3 x5 2 ).

[0137] In this case, the control unit 201 sets the number of data signals and the number of allocated subcarriers to 200, and sets the number of data signals to be mapped to subcarriers in one-to-one correspondence to 200. Then, the control unit 201 sets four subcarriers, excluding the number of allocated subcarriers 200, as overlappingly allocated subcarriers from the number of allocated subcarriers 204. Note that the control unit 201 may set some of the four subcarriers (for example, 1 to 3) as overlappingly allocated subcarriers. In this case, signals do not need to be mapped to subcarriers that are not set as allocated subcarriers or overlappingly allocated subcarriers.

[0138] The control unit 201 sets the positions of the allocated subcarriers and the positions of the overlapped allocated subcarriers from among the allocated subcarriers. The method for setting the positions of the allocated subcarriers may be any of the setting methods 1 to 5 described in the first embodiment. Alternatively, the allocated subcarriers may be set arbitrarily (for example, randomly).

[0139] Then, the control unit 201 sets data signals to be mapped to overlappingly allocated subcarriers from among the data signals to be mapped to the 200 allocated subcarriers in one-to-one correspondence.

[0140] For example, the control unit 201 may set the first four data signals out of the 200 data signals output from the DFT unit 203 and mapped to the allocated subcarriers as the data signals to be mapped to the overlapped allocated subcarriers.

[0141] Here, the first four data signals may be the first four data signals when an order is specified for the output of the DFT unit 203. For example, since the DFT process is a time-frequency transform, the specified order may correspond to the frequency in the DFT process.

[0142] For example, when indexes #0 to #199 are assigned to 200 data signals output from DFT section 203, the data signals assigned indexes #0 to #3 correspond to the first four data signals.

[0143] For example, in the assigned subcarriers, data signals #0 to #199 are mapped in order from the lowest frequency subcarrier, and then data signals #0 to #3 are repeatedly mapped. In this case, in the assigned subcarriers, data signals are mapped in order from the lowest frequency to #0 to #199, and then #0 to #3. This method can suppress an increase in PAPR.

[0144] The control unit 201 outputs allocation resource information including information indicating the number and positions of allocated subcarriers, the number and positions of overlapped allocated subcarriers, and data signals to be mapped to the overlapped allocated subcarriers, to the signal allocation unit 204. In addition, the control unit 201 outputs information regarding the number of uplink data signals, i.e., the number of allocated subcarriers, to the coding and modulation unit 202.

[0145] The coding and modulation unit 202 performs error correction coding and modulation on the uplink data based on the number of data signals, and outputs the data to the DFT unit 203. The DFT unit 203 performs DFT processing (e.g., FFT processing) on ​​the signals received from the coding and modulation unit 202, and outputs the output signal to the signal allocation unit 204. Here, since the number of data signals is a number that does not include prime factors different from a specific number (2, 3, and 5 in the above example), it is possible to suppress an increase in the amount of calculation of the DFT processing (e.g., FFT processing) in the DFT unit 203, and to speed up the DFT processing.

[0146] The signal allocation unit 204 maps the signals received from the DFT unit 203 to the allocated subcarriers based on the positions of the allocated subcarriers. Then, the signal allocation unit 204 repeatedly maps the data signals to the overlappedly allocated subcarriers based on the positions of the overlappedly allocated subcarriers and information indicating the data signals to be mapped to the overlappedly allocated subcarriers.

[0147] Although detailed description is omitted, similar to the control unit 201 of the mobile station 200, the control unit 101 of the base station 100 may change at least one of the number of allocated subcarriers, the positions, and the number of data signals to a value different from the allocation resource information. Information on the change method may be shared between the mobile station 200 and the base station 100. In this case, the mobile station 200 and the base station 100 may change at least one of the number of allocated subcarriers, the positions, and the number of data signals to a value different from the allocation resource information based on the same change method.

[0148] For example, the IDFT unit 108 receives signals mapped to the allocation subcarriers from the signal separation unit 107, the number of which is equal to the number of allocation subcarriers, performs IDFT processing (e.g., FFT processing), and outputs the processed signal to the demodulation and decoding unit 109. The IDFT unit 108 may also receive signals mapped to the overlappingly allocated subcarriers from the signal separation unit 107, and perform interpolation processing before or after the IDFT processing. Here, the number of data signals, i.e., the number of allocation subcarriers, is a number that does not include prime factors different from a specific number (2, 3, and 5 in the above example), so that an increase in the amount of calculation of the IDFT processing (e.g., IFFT processing) in the IDFT unit 108 can be suppressed, and the IDFT processing can be accelerated.

[0149] As described above, in the second embodiment, data signals in the same number as the number of allocated subcarriers are mapped in a one-to-one correspondence to allocated subcarriers in a number that does not include a prime factor different from a specific number (2, 3, and 5 in the above example) among the allocated subcarriers. Then, data signals are repeatedly mapped to subcarriers (overlapping allocated subcarriers) different from the allocated subcarriers among the allocated subcarriers. This makes it possible to suppress an increase in the amount of calculation of DFT processing and IDFT processing corresponding to DFT processing, and to efficiently utilize resources, so that signals can be appropriately transmitted and received in operation in an unlicensed band. In addition, this makes it possible to reduce the possibility of violating the OCB restrictions defined by ETSI, since the occupied band (OCB) of the allocated subcarriers is not narrower than the band of the allocated subcarriers.

[0150] Furthermore, in the second embodiment, a part of the data signal is repeatedly transmitted in the frequency domain, so that the reliability of the data signal can be improved.

[0151] (Embodiment 3) In the first and second embodiments, examples in which a number indicating the amount of allocation resources is determined are described. In the third embodiment, an example of a method for determining the amount of data signals (the number of data signals), which is different from the first and second embodiments, is described.

[0152] The outline of the communication system according to the third embodiment, the configuration of the base station, the configuration of the mobile station, and the operation sequence are the same as those in the first embodiment, and therefore detailed description will be omitted. Hereinafter, the third embodiment will be described by using the outline of the communication system, the configuration of the base station, and the configuration of the mobile station shown in the first embodiment.

[0153] In the third embodiment, similarly to the first embodiment, for example, when a number indicating the amount of resources allocated to the mobile station 200 includes a prime factor different from a specific number, the control unit 201 controls the transmission process under the assumption that the resources allocated to the mobile station 200 and the resources to which an uplink data signal is mapped are different.

[0154] For example, when the number of allocated subcarriers includes a prime factor different from a specific number, the control unit 201 may change at least one of the number, position, and number of data signals of allocated subcarriers to a value different from the allocated resource information.

[0155] For example, control section 201 according to the third embodiment may set any number that is equal to or greater than the number of allocated subcarriers (or a number greater than the number of allocated subcarriers) and does not contain a prime factor different from a specific number (i.e., a number whose prime factors include only a specific number) as the number of data signals output from DFT section 203. Note that, hereinafter, the data signal output from DFT section 203 may be referred to as an "output data signal".

[0156] For example, the number of output data signals may be set to the smallest number that is equal to or greater than the number of allocated subcarriers and does not contain a prime factor different from a specific number.

[0157] Then, control section 201 outputs allocation resource information including the set number of output data signals to signal allocation section 204. In addition, control section 201 outputs information relating to the number of output data signals to encoding / modulation section 202.

[0158] The coding and modulation unit 202 performs error correction coding and modulation on the uplink data based on the number of output data signals, and outputs the data to the DFT unit 203. The number of signals output to the DFT unit 203 corresponds to the number of output data signals.

[0159] DFT unit 203 performs DFT processing (e.g., FFT processing) on ​​the signal received from encoding / modulating unit 202, and outputs an output data signal to signal allocation unit 204. Here, since the number of output data signals is a number that does not include prime factors other than specific numbers (e.g., 2, 3, and 5), it is possible to suppress an increase in the amount of calculation of DFT processing (e.g., FFT processing) in DFT unit 203, and to speed up DFT processing.

[0160] Signal allocation unit 204 maps the signals received from DFT unit 203. In the case of the third embodiment, the number of signals received from DFT unit 203, i.e., the number of output data signals, is greater than the number of allocated subcarriers. Therefore, signal allocation unit 204 does not need to map some of the signals received from DFT unit 203.

[0161] Similarly to the control unit 201 of the mobile station 200, the control unit 101 of the base station 100 may change at least one of the number of allocated subcarriers, the positions, and the number of data signals to a value different from the allocated resource information. Information on the change method may be shared between the mobile station 200 and the base station 100. In this case, the mobile station 200 and the base station 100 may change at least one of the number of allocated subcarriers, the positions, and the number of data signals to a value different from the allocated resource information based on the same change method.

[0162] An example of the third embodiment will be described with reference to the example of Fig. 8. For example, when the allocated resources shown in Fig. 8 are allocated to mobile station 200, control unit 201 determines that the allocated resources are interlaces #0 and #10. Then, control unit 201 determines that the number of allocated subcarriers is 204.

[0163] Then, the control unit 201 determines whether the number of assigned subcarriers includes a prime factor different from the specific number. For example, when the specific number is 2, 3, and 5, the number of assigned subcarriers is 204=2×2×3×17, so the control unit 201 determines that the number of assigned subcarriers includes 17, which is a prime factor different from 2, 3, and 5.

[0164] In the above example, the number of allocated subcarriers is 204, and the specific numbers are 2, 3, and 5. In this case, the smallest number among the numbers that is equal to or greater than the number of allocated subcarriers and does not contain a prime factor different from the specific numbers is 216 (=2 3 ×3 3 ).

[0165] In this case, control unit 201 sets the number of output data signals to 216. Then control unit 201 outputs allocation resource information including the set number of output data signals to signal allocation unit 204. In addition, control unit 201 outputs information related to the number of output data signals to encoding and modulation unit 202.

[0166] In the above example, the signals received from the DFT unit 203, i.e., the 216 output data signals, are 12 more than the 204 assigned subcarriers. Therefore, the signal assignment unit 204 does not need to map at least the 12 output data signals.

[0167] As described above, in the third embodiment, any number that is equal to or greater than the number of allocated subcarriers and does not include a prime factor different from a specific number (i.e., a number whose prime factors include only a specific number) is set as the number of data signals output from DFT unit 203. This method can suppress an increase in the amount of calculation for DFT processing and IDFT processing corresponding to DFT processing, and can efficiently use resources, so that signals can be appropriately transmitted and received in an operation in an unlicensed band. This method also allows the allocated subcarriers to be used efficiently, and the transmission speed can be improved.

[0168] (Embodiment 4) In the third embodiment, an example has been described in which the number of output data signals output from DFT unit 203 is set to be equal to or greater than the number of allocated subcarriers, and some of the output data signals output from DFT unit 203 are not mapped to subcarriers. In the fourth embodiment, an example will be described in which some of the output data signals output from DFT unit 203 are mapped to resources different from the allocated subcarriers.

[0169] The outline of the communication system according to the fourth embodiment, the configuration of the base station, the configuration of the mobile station, and the operation sequence are the same as those in the first embodiment, and therefore detailed description will be omitted. In the following, the second embodiment will be described by using the outline of the communication system, the configuration of the base station, and the configuration of the mobile station shown in the first embodiment.

[0170] In the fourth embodiment, similarly to the third embodiment, the control section 201 sets the number of output data signals.

[0171] Then, control section 201 outputs allocation resource information including the set number of output data signals to signal allocation section 204. In addition, control section 201 outputs information relating to the number of output data signals to encoding / modulation section 202.

[0172] The coding and modulation unit 202 performs error correction coding and modulation on the uplink data based on the number of output data signals, and outputs the data to the DFT unit 203. The number of signals output to the DFT unit 203 corresponds to the number of output data signals.

[0173] DFT unit 203 performs DFT processing (e.g., FFT processing) on ​​the signal received from encoding / modulating unit 202, and outputs an output data signal to signal allocation unit 204. Here, since the number of output data signals is a number that does not include prime factors other than specific numbers (e.g., 2, 3, and 5), it is possible to suppress an increase in the amount of calculation of DFT processing (e.g., FFT processing) in DFT unit 203, and to speed up DFT processing.

[0174] Signal allocation unit 204 maps the signals received from DFT unit 203. In the case of embodiment 4, similar to embodiment 3, the number of signals received from DFT unit 203, i.e., the number of output data signals, is greater than the number of assigned subcarriers. In embodiment 4, signal allocation unit 204 maps some of the output data signals received from DFT unit 203 to resources different from the assigned subcarriers. Hereinafter, the output data signals mapped to resources different from the assigned subcarriers may be referred to as surplus data signals. The surplus data signals correspond to at least some or all of the output data signals that are not mapped to the assigned subcarriers.

[0175] For example, the excess data signal may be mapped to resources that are not allocated to the mobile station 200. Selection of the resources that are not allocated to the mobile station 200 may be performed by the control unit 201, for example.

[0176] For example, the control unit 201 may select subcarriers of the number of surplus data signals from among the subcarriers located between the assigned subcarriers. Information indicating the positions of the selected subcarriers may be included in the allocation resource information and output to the signal allocation unit 204. Note that information on the method of selecting subcarriers may be known between the mobile station 200 and the base station 100, or may be notified from the base station 100 to the mobile station 200. Alternatively, information on the method of selecting subcarriers and / or information indicating the positions of the selected subcarriers may be notified from the mobile station 200 to the base station 100.

[0177] In this case, the signal allocation unit 204 may map the excess data signal to the selected subcarriers based on the allocation resource information.

[0178] Similarly to the control unit 201 of the mobile station 200, the control unit 101 of the base station 100 may change at least one of the number of allocated subcarriers, the positions, and the number of data signals to a value different from the allocated resource information. Information on the change method may be shared between the mobile station 200 and the base station 100. In this case, the mobile station 200 and the base station 100 may change at least one of the number of allocated subcarriers, the positions, and the number of data signals to a value different from the allocated resource information based on the same change method.

[0179] An example of the fourth embodiment will be described with reference to the example of Fig. 8. For example, when the allocation resources shown in Fig. 8 are allocated to mobile station 200, control unit 201 sets the number of output data signals to 216, as in the example shown in the third embodiment.

[0180] In the above example, the signals received from the DFT unit 203, i.e., the 216 output data signals, are 12 more than the 204 assigned subcarriers. Therefore, the signal assignment unit 204 maps at least the 12 surplus data signals to resources different from the assigned subcarriers.

[0181] As described above, in the fourth embodiment, any number that is equal to or greater than the number of allocated subcarriers and does not include a prime factor different from a specific number (i.e., a number whose prime factors include only a specific number) is set as the number of data signals output from DFT unit 203. This method can suppress an increase in the amount of calculation for DFT processing and IDFT processing corresponding to DFT processing, and can efficiently use resources, so that signals can be appropriately transmitted and received in an operation in an unlicensed band. This method also allows efficient use of allocated subcarriers, and can improve the transmission speed.

[0182] Furthermore, in the fourth embodiment, resources not allocated to the mobile station 200 are added to the allocated resources and used to transmit all of the data signals output from the DFT unit 203. This makes it possible to improve the transmission speed and execute highly reliable signal transmission.

[0183] In the above-described fourth embodiment, the resource for mapping the surplus data signal is selected on a subcarrier basis. By selecting on a subcarrier basis, the resource for use in signal transmission can be flexibly set.

[0184] In the fourth embodiment, the resource to which the surplus data signal is mapped may be selected in units of PRB.

[0185] For example, the control unit 201 may select a PRB that is large enough to map the surplus data signal from among the PRBs of the allocated resource. Information indicating the positions of the selected PRBs may be included in the allocation resource information and output to the signal allocation unit 204.

[0186] In this way, by selecting resources for mapping surplus data signals in PRB units, signal transmission / reception processing can be performed in PRB units, facilitating implementation.

[0187] (Embodiment 5) In this embodiment 5, for example, an example will be described in which the method of any one of the above-mentioned embodiments 1 to 4 is applied based on the number of allocated subcarriers. Note that the methods already described in the embodiments 1 to 4 will be omitted as appropriate.

[0188] The outline of the communication system according to the fifth embodiment, the configuration of the base station, the configuration of the mobile station, and the operation sequence are the same as those in the first embodiment, and therefore detailed description will be omitted. Hereinafter, the fifth embodiment will be described by using the outline of the communication system, the configuration of the base station, and the configuration of the mobile station shown in the first embodiment.

[0189] In the fifth embodiment, similarly to the first embodiment and the like, for example, when a number indicating the amount of resources allocated to the mobile station 200 includes a prime factor different from a specific number, the control unit 201 controls the transmission process under the assumption that the resources allocated to the mobile station 200 and the resources to which an uplink data signal is mapped are different.

[0190] For example, when the number of allocated subcarriers includes a prime factor different from a specific number, the control unit 201 may change at least one of the number, position, and number of data signals of allocated subcarriers to a value different from the allocated resource information.

[0191] For example, the control unit 201 according to this embodiment 5 may set the number that is closest to the number of allocated subcarriers among numbers that do not contain prime factors different from a specific number (i.e., numbers whose prime factors include only a specific number) as the number of output data signals output from the DFT unit 203.

[0192] For example, when the number of set output data signals is equal to or less than the number of allocated subcarriers, control section 201 determines, as in the first and second embodiments, from among the allocated subcarriers, the allocation subcarriers to which the output data signals are to be mapped.

[0193] In this case, the assigned subcarriers not included in the allocation subcarriers may not be used, as in the first embodiment. Alternatively, the output data signal may be repeatedly mapped to the assigned subcarriers not included in the allocation subcarriers, as in the second embodiment.

[0194] Also, for example, when the set number of output data signals is equal to or greater than the number of allocated subcarriers, control section 201 maps the output data signals in the number of allocated subcarriers to the allocated subcarriers, similarly to the third and fourth embodiments.

[0195] In this case, the output data signals (surplus data signals) that are not mapped to the assigned subcarriers may be excluded, as in the third embodiment. Alternatively, the output data signals (surplus data signals) that are not mapped to the assigned subcarriers may be mapped to unallocated resources, as in the fourth embodiment.

[0196] An example of the fifth embodiment will be described with reference to the example of Fig. 8. For example, when the allocated resources shown in Fig. 8 are allocated to mobile station 200, control unit 201 determines that the allocated resources are interlaces #0 and #10. Then, control unit 201 determines that the number of allocated subcarriers is 204.

[0197] Then, the control unit 201 determines that, among the numbers that do not contain prime factors different from the specific numbers (2, 3, and 5), the number closest to the number of allocated subcarriers is 200 (=2 3 x5 2 ), so set the number of output data signals to 200.

[0198] In this case, since the number of set output data signals is smaller than the number of allocated subcarriers, the control unit 201 determines the allocation subcarriers to which the output data signals are mapped from among the allocated subcarriers, similar to the first and second embodiments. Then, similar to the first embodiment, the allocated subcarriers that are not included in the allocated subcarriers may not be used. Alternatively, similar to the second embodiment, the output data signals may be repeatedly mapped to the allocated subcarriers that are not included in the allocated subcarriers.

[0199] As described above, in the fifth embodiment, the method of any one of the first to fourth embodiments is applied based on the number of allocated subcarriers. This method can suppress an increase in the amount of calculation of the DFT process and the IDFT process corresponding to the DFT process, and can utilize resources efficiently, so that signals can be appropriately transmitted and received in an operation in an unlicensed band. This method can also suppress a decrease in the frequency utilization efficiency and transmission rate of the allocated subcarriers. This method can also suppress an increase in the utilization rate of unallocated resources and a decrease in reliability in signal transmission and reception.

[0200] (Another embodiment 1) In the above-described first to fifth embodiments, examples of interlace configurations have been described in which the numbers assigned to interlaces with a larger N are larger than the numbers assigned to interlaces with a smaller N. For example, in the interlace configuration illustrated in FIG. 2, an example has been described in which the numbers assigned to interlaces with N=9 are 0 to 9, and the numbers assigned to interlaces with N=9 are 10 and 11. The present disclosure is not limited to this. In another first embodiment, an example of a configuration different from the interlace configuration illustrated in FIG. 2 will be described.

[0201] Fig. 9 is a diagram showing another example of interlacing in NR-U. Fig. 9 shows an example in which M and N indicating the interlacing configuration are (M, N) = (10, 10 or 11).

[0202] In FIG. 9, for N=11 interlaces (i.e., interlaces with 11 PRBs), the interlaces are numbered 0, 1, 3, 4, 6, 7, and for N=10 interlaces (i.e., interlaces with 10 PRBs), the interlaces are numbered 2, 5, 8, 9.

[0203] For example, a case will be described in which control unit 101 of base station 100 assigns three interlaces to mobile station 200 in the interlace configuration shown in Fig. 9. In this case, an assignment method may be assumed in which interlaces with consecutive numbers are assigned to mobile station 200. Under this assumption, three interlaces with consecutive numbers (e.g., interlaces #0, #1, and #2) in the interlace configuration shown in Fig. 9 are assigned to mobile station 200.

[0204] For example, when interlaces #0, #1, and #2 are assigned to the mobile station 200, the total number of PRBs in the assigned resources of the mobile station 200 is 32. Since one PRB has 12 subcarriers, the total number of assigned subcarriers of the mobile station 200 is 384 (=2 7 In this case, the number of subcarriers allocated to the mobile station 200 is a number that does not contain any prime factor different from 2, 3, and 5.

[0205] As described above, in another embodiment 1, the setting of the numbers assigned to the interlaces is changed based on the interlace allocation method and the interlace configuration in the base station 100. This method can suppress an increase in the amount of calculation of the DFT process and the IDFT process corresponding to the DFT process. In addition, the allocated subcarriers can be used efficiently, and the transmission speed can be improved.

[0206] (Another embodiment 2) In the above-mentioned embodiment 1, an example in which the interlace is configured to distribute the PRBs at equal intervals has been described. The present disclosure is not limited to this, and the configuration of the interlace may be changed. In another embodiment 2, an example in which the interlace has a resource in a unit different from the PRB will be described.

[0207] Fig. 10 is a diagram showing an example of an interlace configuration according to another embodiment 2. The example shown in Fig. 10 is an example of an interlace configuration in which the maximum number of PRBs allocated is 106, and M=12. In the example shown in Fig. 10, a subcarrier group having 12 subcarriers (i.e., PRB) is shown in the low frequency portion. Then, a subcarrier group having 8 subcarriers is shown in the high frequency portion. Hereinafter, a subcarrier group having 8 subcarriers may be referred to as a sub-PRB.

[0208] 10, one interlace includes 8 PRBs and 1 sub-PRB, and therefore has 96 subcarriers. For example, when one interlace is assigned to mobile station 200, the number of assigned subcarriers is a number that does not include prime factors different from specific numbers (2, 3, and 5).

[0209] Also, when two or more interlaces are assigned, excluding 7 and 11, the number of assigned subcarriers is a number that does not contain prime factors different from the specific numbers (2, 3, and 5), just as when one interlace is assigned.

[0210] As described above, in another embodiment 2, the unit of the resources constituting the interlace is changed. This change can suppress the increase in the amount of calculation of the DFT process and the IDFT process corresponding to the DFT process. In addition, the allocated subcarriers can be used efficiently, and the transmission speed can be improved.

[0211] In addition, in the second embodiment, an example has been described in which the resource unit of the low frequency portion is PRB and the resource unit of the high frequency portion is sub-PRB. For example, the resource unit of the high frequency portion may be PRB and the resource unit of the low frequency portion may be sub-PRB, or PRB and sub-PRB may be mixed without being biased in the frequency domain.

[0212] In addition, in the second embodiment, an example has been described in which some resource units are PRBs and the remaining resource units are sub-PRBs. For example, all resource units may be defined by sub-PRBs. Alternatively, they may be defined by a plurality of subcarrier groups having different numbers of subcarriers. For example, a subcarrier group having eight subcarriers and a subcarrier group having six subcarriers may be defined as resource units.

[0213] In each of the above-mentioned embodiments, when any part of an interlace included in the allocation resource is a subcarrier group having two or more subcarriers (for example, sub-PRB) and / or a single subcarrier, the allocation method of pilot signals (for example, channel estimation reference signals and Demodulation Reference Signals (DMRS)) in the resource of the part may be the same as the allocation method of pilot signals in PRB. Alternatively, pilot signals may not be allocated in the resource of the part.

[0214] Also, the methods described in the above-mentioned embodiments may be used alone or in combination. Alternatively, the method to be used may be switched depending on the situation (e.g., communication environment and / or traffic volume). For example, the communication environment may be represented by at least one of Reference Signal Received Power (RSRP), Received Signal Strength Indicator (RSSI), Reference Signal Received Quality (RSRQ), and Signal-to-Interference plus Noise power Ratio (SINR), or may be other parameters. Also, for example, the traffic volume may be represented by at least one of the number of mobile stations connected to the base station, the amount of data transmitted by the mobile station, and the amount of resources that can be allocated to the mobile station, or may be other parameters.

[0215] Further, in each of the above-described embodiments, an example has been described in which the mobile station and the base station adjust (change) the allocation resources and the number of data signals to be transmitted and received, but the present disclosure is not limited to this.

[0216] For example, whether or not to adjust and / or the adjustment method may be predefined in a standard. For example, the base station and the mobile station may recognize the same adjustment method and adjust in the same way.

[0217] Also, the base station may explicitly or implicitly notify the mobile station of the adjustment method using, for example, higher layer signaling and / or DCI. The mobile station may adjust according to the notification from the base station. When the adjustment method is implicitly notified, for example, the adjustment method may be implied by the number of the allocated resource or the interlace.

[0218] Alternatively, the mobile station may adjust the transmission rate and notify the base station of the result of the adjustment explicitly or implicitly using a higher layer signal and / or an Uplink Control Signal (UCI), etc. In this case, the base station may adjust the transmission rate according to the notification.

[0219] In addition, in each of the operation examples of each of the above-mentioned embodiments, it is assumed that the mobile station uses DFT processing, but the present disclosure is not limited to this. For example, the interlace arrangement may be realized by a CP-OFDM (Cyclic Prefix - Orthogonal Frequency Division Multiplexing) signal waveform.

[0220] In addition, in each of the above-mentioned embodiments, an uplink is assumed in which the mobile station corresponds to the transmitter and the base station corresponds to the receiver, but, for example, a downlink may be used in which the base station corresponds to the transmitter and the mobile station corresponds to the receiver. Also, it may be a wireless communication link (for example, a sidelink) established in communication between mobile stations (for example, vehicle-to-vehicle communication). In this case, the mobile station that performs communication corresponds to the transmitter and the receiver. Alternatively, it is not limited to these, and may be applied to other communications, etc.

[0221] In addition, in each of the above-mentioned embodiments, the notations "... section" and "... device" used for the components of base station 100 and mobile station 200 may be replaced with other notations such as "... circuitry," "... device," "... unit," or "... module."

[0222] In addition, in each of the above-described embodiments, the terms "specify," "decide," "set," "judge," and "assume" may be read as interchangeable terms.

[0223] Furthermore, in each of the above-described embodiments, the term "higher layer signal" may be replaced with a term such as "RRC signal (Radio Resource Control signaling)".

[0224] Furthermore, in each of the above-described embodiments, the term "DFT" may be replaced with terms such as "Discrete Fourier Transform" and "Transform Precoding".

[0225] Furthermore, in each of the above-described embodiments, the term "FFT" may be replaced with terms such as "Fast Fourier Transform" and "Transform Precoding".

[0226] In addition, in each of the above-mentioned embodiments, the term "IDFT" may be replaced with a term such as "inverse discrete Fourier transform."

[0227] Furthermore, in each of the above-described embodiments, the term "IFFT" may be replaced with a term such as "inverse fast Fourier transform."

[0228] In addition, in each of the above-mentioned embodiments, the bandwidth of the resource defined in the frequency domain, the number of subcarriers, the number of PRBs, etc. are examples, and the present disclosure is not limited thereto. In addition, the notations that define the unit of dividing the resource, such as "subcarrier", "PRB" and "sub-PRB", are examples, and may be replaced with other notations.

[0229] The above describes each embodiment.

[0230] The present disclosure can be realized in software, hardware, or software in conjunction with hardware.

[0231] Each functional block used in the description of the above embodiments may be realized, in part or in whole, as an LSI, which is an integrated circuit, and each process described in the above embodiments may be controlled, in part or in whole, by one LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of one chip that includes some or all of the functional blocks. The LSI may have data input and output. Depending on the degree of integration, the LSI may be called an IC, a system LSI, a super LSI, or an ultra LSI.

[0232] The method of integration is not limited to LSI, and may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Also, after LSI manufacturing, a programmable FPGA (Field Programmable Gate Array) or a reconfigurable processor that can reconfigure the connections and settings of circuit cells inside the LSI may be used. The present disclosure may be realized as digital processing or analog processing.

[0233] Furthermore, if a new integrated circuit technology that can replace LSI appears due to the progress of semiconductor technology or a derivative technology, it is possible to integrate the functional blocks using that technology. The application of biotechnology is also a possibility.

[0234] The present disclosure may be implemented in any type of apparatus, device, or system with communications capabilities (collectively, communications apparatus), including, but not limited to, telephones (e.g., cell phones, smartphones, etc.), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks, etc.), cameras (e.g., digital still / video cameras), digital players (e.g., digital audio / video players), wearable devices (e.g., wearable cameras, smart watches, tracking devices, etc.), game consoles, digital book readers, telehealth / telemedicine devices, communications-enabled vehicles or mobile conveyances (e.g., cars, planes, ships, etc.), and combinations of the above-mentioned devices.

[0235] Communications Equipment includes, but is not limited to portable or mobile equipment, non-portable or fixed equipment, devices and systems of any kind, such as smart home devices (appliances, lighting equipment, smart meters or metering devices, control panels, etc.), vending machines and any other "Things" that may exist on an Internet of Things (IoT) network.

[0236] Communications include data communications via cellular systems, wireless LAN systems, communications satellite systems, etc., as well as data communications via combinations of these.

[0237] A communications apparatus also includes devices, such as controllers and sensors, connected or coupled to a communications device that performs the communications functions described in this disclosure, such as controllers and sensors that generate control and data signals used by the communications device to perform the communications functions of the communications apparatus.

[0238] The communication apparatus also includes infrastructure facilities, such as base stations, access points, and any other apparatus, device, or system that communicates with or controls the various apparatuses listed above, but are not limited to these.

[0239] A mobile station in one embodiment of the present disclosure includes a transmission circuit for transmitting an uplink signal, and a control circuit for controlling, when a first number representing an amount of first resources available for transmitting the uplink signal includes a third number different from a specific second number as a prime factor, transmission of a fourth number using second resources, the fourth number not including the third number as a prime factor.

[0240] A mobile station according to one embodiment of the present disclosure includes a discrete Fourier transformer that performs a discrete Fourier transform of a modulated signal and outputs the signal, and a signal allocation circuit that maps the signal to the second resource and outputs the uplink signal, and the control circuit sets the number of the modulated signals to the fourth number and sets the second resource based on the first number and the fourth number.

[0241] In a mobile station according to an embodiment of the present disclosure, when the first number is greater than the fourth number, the control circuit sets the second resource to resources obtained by excluding a third resource from the first resources.

[0242] In a mobile station according to an embodiment of the present disclosure, the control circuit sets at least a portion of the third resource as a resource for repeatedly transmitting a portion of the signal.

[0243] In a mobile station according to an embodiment of the present disclosure, the control circuit sets a resource located in at least one of a highest frequency band and a lowest frequency band among the first resources as the third resource.

[0244] In a mobile station according to an embodiment of the present disclosure, the control circuit sets a resource that is not located in a highest frequency band or a lowest frequency band among the first resources as the third resource.

[0245] In a mobile station according to an embodiment of the present disclosure, the control circuit sets, as the third resource, a portion of resources located at predetermined intervals on a frequency axis among the first resources.

[0246] In a mobile station according to one embodiment of the present disclosure, when the first number is smaller than the fourth number, the control circuit sets the first resource to the second resource for transmitting a signal excluding a portion of the fourth number of signals.

[0247] In a mobile station according to an embodiment of the present disclosure, the control circuit sets a resource different from the first resource as a resource for transmitting the excluded signal.

[0248] In a mobile station according to an embodiment of the present disclosure, the control circuit determines the second resource on a subcarrier basis or on a subcarrier group basis.

[0249] In a mobile station according to an embodiment of the present disclosure, the control circuit determines the second resource in units of physical resource blocks.

[0250] In a mobile station according to one embodiment of the present disclosure, the control circuit determines a number closest to the first number among numbers that have the second number as a prime factor and do not have the third number as a prime factor as the fourth number, and differentiates transmission processing between a case where the first number is greater than the fourth number and a case where the first number is smaller than the fourth number.

[0251] In one embodiment of the present disclosure, a base station includes a receiving circuit that receives an uplink signal, and a control circuit that controls reception of a signal of a fourth number using second resources when a first number representing an amount of first resources available for transmitting the uplink signal includes a third number different from a specific second number as a prime factor. The fourth number does not include the third number as a prime factor.

[0252] In one embodiment of the present disclosure, a base station includes a signal separation circuit that separates a signal mapped to the second resource, and an inverse discrete Fourier transform circuit that performs an inverse discrete Fourier transform of the separated signal and outputs an output signal, and the control circuit sets the number of the output signals to the fourth number and sets the second resource based on the first number and the fourth number.

[0253] In one embodiment of the present disclosure, a transmission method, when a first number representing an amount of first resources available for transmitting an uplink signal includes a third number different from a specific second number as a prime factor, sets a fourth number that does not include the third number as a prime factor, and controls transmission of the fourth number of signals using the second resources.

[0254] In one embodiment of the present disclosure, a receiving method, when a first number representing an amount of first resources available for transmitting an uplink signal includes a third number different from a specific second number as a prime factor, sets a fourth number that does not include the third number as a prime factor, and controls reception of the fourth number of signals using the second resources.

[0255] In one embodiment of the present disclosure, a base station includes a receiving circuit that receives an uplink signal, and a control circuit that determines a first resource that can be used to transmit the uplink signal and controls the receiving processing of the uplink signal in the first resource, wherein the first resource has one or more bands located at a predetermined interval among multiple bands into which a predetermined frequency band is divided, and the control circuit sets the one or more bands to the first resource such that a number representing the amount of resources included in the first resource does not include a third number different from a specified second number as a prime factor.

[0256] A mobile station in one embodiment of the present disclosure includes a transmission circuit that transmits a signal, and a control circuit that controls a transmission process of the signal using a first resource that is available, the first resource having one or more bands located at a predetermined interval among a plurality of bands into which a predetermined frequency band is divided, at least a portion of the plurality of bands having a bandwidth different from a remaining portion of the plurality of bands, and a number representing an amount of resources included in the first resource does not include a third number different from a specified second number as a prime factor.

[0257] The disclosures of the specification, drawings and abstract contained in Japanese Patent Application No. 2018-206872, filed on November 1, 2018, are incorporated herein by reference in their entirety. [Industrial Applicability]

[0258] An embodiment of the present disclosure is useful in a mobile communication system. [Explanation of symbols]

[0259] 100 base stations 101,201 Control section 102,202 Coding and modulation section 103,204 Signal allocation section 104,205 Transmitter 105,206 Antennas 106,207 Receiver 107,208 Signal separation section 108 IDFT Department 109,209 Demodulation and Decoding Section 200 Mobile Station 203 DFT section

Claims

1. a transmitter for transmitting resource allocation information indicating a set of one or more interlace numbers selected from a plurality of interlace numbers; a receiver for receiving an upstream signal in a first resource block in the band; When the resource allocation information indicates a set of two or more interlace numbers, and when a number of second resource blocks indicated by the set of two or more interlace numbers is different from an integer based on one or more specific prime numbers, the number of resource blocks in the first resource block is an integer based on one or more specific prime numbers, and is a maximum integer less than or equal to the number of second resource blocks. Communications equipment.

2. the first resource block is the lowest resource block among the second resource blocks. The communication device according to claim 1 .

3. Each of the interlace numbers indicates a plurality of resource blocks equally spaced in the frequency domain. The communication device according to claim 1 .

4. the resource allocation information indicates the one or more sets of interlace numbers selected from a plurality of sets including two or more sets of interlace numbers. The communication device according to claim 1 .

5. a data size of the uplink signal is determined based on the first resource block; The communication device according to claim 1 .

6. each of said interlace numbers indicating a different number of resource blocks; The communication device according to claim 1 .

7. The one or more specific prime numbers are any one or more of 2, 3, and 5. The communication device according to claim 1 .

8. The resource allocation information is indicated by downlink control information. The communication device according to claim 1 .

9. transmitting resource allocation information indicating a set of one or more interlace numbers selected from the plurality of interlace numbers; receiving an upstream signal on a first resource block in the band; When the resource allocation information indicates a set of two or more interlace numbers, and when a number of second resource blocks indicated by the set of two or more interlace numbers is different from an integer based on one or more specific prime numbers, the number of resource blocks in the first resource block is an integer based on one or more specific prime numbers, and is a maximum integer less than or equal to the number of second resource blocks. Communication methods.

10. the first resource block is the lowest resource block among the second resource blocks. The communication method according to claim 9.

11. Each of the interlace numbers indicates a plurality of resource blocks equally spaced in the frequency domain. The communication method according to claim 9.

12. the resource allocation information indicates the one or more sets of interlace numbers selected from a plurality of sets including two or more sets of interlace numbers. The communication method according to claim 9.

13. a data size of the uplink signal is determined based on the first resource block; The communication method according to claim 9.

14. each of said interlace numbers indicating a different number of resource blocks; The communication method according to claim 9.

15. The one or more specific prime numbers are any one or more of 2, 3, and 5. The communication method according to claim 9.

16. The resource allocation information is indicated by downlink control information. The communication method according to claim 9.

17. transmitting resource allocation information indicating a set of one or more interlace numbers selected from a plurality of interlace numbers; receiving an upstream signal in a first resource block in the band; When the resource allocation information indicates a set of two or more interlace numbers, and when a number of second resource blocks indicated by the set of two or more interlace numbers is different from an integer based on one or more specific prime numbers, the number of resource blocks in the first resource block is an integer based on one or more specific prime numbers, and is a maximum integer less than or equal to the number of second resource blocks. Integrated circuits.

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