Communication device, 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 currently under consideration. The 3GPP (3rd Generation Partnership Project), an international standardization organization, is studying the advancement of the 5G communication system from the perspectives of both the advancement of the LTE (Long Term Evolution) and LTE-Advanced (LTE-A) systems and the advancement of the 5G communication system from the perspective of the new radio access technology (NR) (NEW RAT), a new system that is not necessarily backward compatible with LTE and LTE-A (for example, Non-Patent Document 1).

[0003] In NR, in addition to licensed bands, operation in unlicensed bands, similar to LTE-LAA (License-Assisted Access), is being considered (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] Japanese Patent Application Laid-Open No. 2012-90013 [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, when 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, wherein when the resource allocation information indicates a set of two or more interlace numbers, and 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 the largest integer less than or equal to the number of 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 within a band, and when the resource allocation information indicates a set of two or more interlace numbers, and 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 the largest 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 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 the largest integer less than or equal to the number of second resource blocks.

[0011] A receiving method according to one embodiment of the present disclosure, when a first number representing the amount of first resources available for transmitting uplink signals includes a third number in its prime factors that is different from a specific second number, sets a fourth number that does not include the third number in its prime factors, 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 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 includes one or more bands that are 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 so 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, wherein the first resource includes one or more bands located at a predetermined interval among a plurality of bands into which a predetermined frequency band is divided, at least some of the plurality of bands have a bandwidth different from that of the remaining bands, and 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.

[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 transmitted and received appropriately 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. Such advantages and / or benefits may be provided by some of the embodiments and features described in the specification and drawings, respectively, but not necessarily all of them may be provided to obtain one or more identical features. [Brief explanation of the drawings]

[0017] [Figure 1] Diagram showing an example of interlacing in LTE LAA [Figure 2] Diagram showing an example of interlacing in NR-U [Figure 3] FIG. 1 is a block diagram showing a partial configuration of a base station according to a first embodiment; [Figure 4] FIG. 1 is a block diagram showing a partial configuration of a mobile station according to a first embodiment; [Figure 5] 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. 10 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. 10 is a diagram showing an example of an interlace configuration according to another embodiment 2. DETAILED DESCRIPTION OF THE INVENTION

[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 the European Telecommunications Standards Institute (ETSI) (e.g., Non-Patent Document 3), the upper limit of PSD in the band known as the 5 GHz band 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 transmit power under the PSD constraint, it is effective to allocate resources by spreading them in the frequency domain. Therefore, an allocation method called interlaced 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. Each 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. Also, different interlaces are assigned different identifiers. The identifiers assigned to the interlaces are sometimes referred to as interlace numbers.

[0024] An allocation technique called interlace allocation is used, for example, in the uplink. A base station (which may also be called, for example, a Base Station, a Node B, or a gNB) may notify a mobile station (which may also be called, for example, a terminal or a UE (User Equipment)) 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 each assigned an interlace number from 0 to 9. Note that hereinafter, 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 evenly spaced in the frequency domain. The number in each PRB indicates the interlace number. 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 the 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 NR systems in unlicensed bands (e.g., frequency bands below 7 GHz), interlace configurations are being considered based on the maximum number of PRB allocations described above.

[0029] For example, 3GPP considers multiple combinations of M and N when a 20 MHz band is divided into M interlaces and each of the M interlaces has N PRBs. M and N are examples of parameters that indicate the interlace configuration. If the maximum number of PRBs allocated is not a multiple of M, it considers 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 uplink, a mobile station may apply DFT (Discrete Fourier Transform) processing to a signal to be transmitted in order to reduce 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 DFT-processed signal to interlace resources. Furthermore, when the mobile station transmits the DFT-processed signal, the base station may apply IDFT (Inverse Discrete Fourier Transform) processing in the receiving process.

[0032] It is known that in DFT processing using an FFT (Fast Fourier Transform), the amount of calculation is reduced when the DFT size can be prime-factorized into relatively small prime numbers (e.g., Non-Patent Document 6). The DFT size corresponds to, for example, the number of outputs after the DFT processing. It is also known that in IDFT processing using an IFFT (Inverse Fast Fourier Transform), the amount of calculation is reduced when the IDFT size, which is the same as the DFT size, can be prime-factorized into relatively small prime numbers. Therefore, when a DFT-S-OFDM (DFT-S-OFDM) signal waveform is used in the uplink of an NR system, one example of a condition is that the number of subcarriers assigned to a mobile station must have at least one prime factor of 2, 3, or 5 (e.g., Non-Patent Document 7). In other words, the condition is that the number of subcarriers assigned to a mobile station must not include any prime factor other than 2, 3, or 5.

[0033] In LTE LAA, which operates an 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 allocated to a mobile station is a multiple of 10. In other words, the number of allocated subcarriers is a multiple of 120. Here, because 120 does not contain any prime factors other than 2, 3, and 5, the above-mentioned condition can be met relatively easily in LTE LAA.

[0034] In the interlace configuration under NR-U considerations, the number of allocated subcarriers may have prime factors other than 2, 3, and 5. We will explain this using 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] Note that the combination of M and N indicating the interlace configuration in the NR-U considerations is not limited to (M,N) = (12,8 or 9). For example, when the subcarrier spacing is 15 kHz, the combination of M and N indicating the interlace configuration may be (M,N) = (10,10 or 11) or (M,N) = (8,13 or 14). When the subcarrier spacing is 30 kHz, the combination of M and N indicating the interlace configuration may be (M,N) = (6,8 or 9), (M,N) = (5,10 or 11), or (M,N) = (4,12 or 13). When the subcarrier spacing is 60 kHz, the combination of M and N indicating the interlace configuration may be (M,N) = (4,6), (M,N) = (3,8), or (M,N) = (2,12). Furthermore, if 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, 6 or 7), (M, N) = (2, 13), or (M, N) = (3, 8 or 9).

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

[0037] For example, when one interlace with N=8 and one interlace with N=9 are assigned to a mobile station, the number of PRBs assigned to the mobile station is 17, i.e., the number of subcarriers assigned to the mobile station is 204. Because 204 includes the relatively large prime factor of 17, when the mobile station performs DFT processing on signals mapped to 204 subcarriers, the amount of calculation for the DFT processing may increase. Furthermore, when the base station performs IDFT processing on signals mapped to 204 subcarriers by the mobile station, the amount of calculation for the IDFT processing may increase, similar to the 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 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 resource mapping process, and transmits the signal to the base station 100.

[0040] Fig. 3 is a block diagram showing a partial configuration of a base station 100 according to the first embodiment of the present disclosure. In the base station 100 shown in Fig. 3, a receiving unit 106 receives an uplink signal, and a control unit 101 controls reception of a signal of a fourth number using the second resources and whose prime factors do not include the third number, when a first number representing the amount of first resources 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 partial configuration 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, the fourth number not including the third number in its prime factors, using the second resources, when a first number representing the 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 the configuration of base station 100 according to the first embodiment.

[0043] In FIG. 5, the base station 100 includes a control unit 101, an encoding and modulation unit 102, a signal allocation unit 103, a transmission unit 104, an antenna 105, a reception unit 106, a signal separation unit 107, an IDFT (Inverse Discrete Fourier Transform) unit 108, and a demodulation and 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 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 reception process assuming 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. Furthermore, the specific number is, for example, a relatively small prime number such as 2, 3, or 5. Furthermore, the fact that the resources onto which data signals are mapped are different from the allocated resources corresponds to, for example, the fact that the number and / or positions of the subcarriers onto which the data signals are mapped are different from the number and / or positions of the allocated subcarriers. Furthermore, the fact that the resources onto which data signals are mapped are different from the allocated resources may also include the fact that the number of received data signals is different from the number of data signals receivable in the allocated resources.

[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 may exclude at least one of 2, 3, and 5.

[0049] For example, if 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 data signals are mapped, their 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, their positions, and the number of data signals included in the allocation resource information. The changed information indicates the resources to which the data signals are allocated and / or the number of uplink data signals transmitted by the mobile station 200. Furthermore, for example, the changed number of data signals may be the number of data signals output from the IDFT unit 108. Hereinafter, the changed information may be referred to as allocation resource information. The control unit 101 outputs the allocation resource information to the signal separation unit 107. Furthermore, 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 signals acquired from the coding and modulation unit 102 and / or the DCI acquired from the control unit 101 to resources defined in the time domain and the frequency domain. The signal allocation unit 103 outputs the allocated signals 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 emits 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) on the signal received from antenna 105, and outputs the signal that has undergone radio reception processing to signal separating section 107.

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

[0056] The IDFT unit 108 performs IDFT processing (for example, IFFT processing) on ​​the data signals received from the signal separation unit 107. The IDFT unit 108 outputs the data signals after the IDFT processing to the demodulation and decoding unit 109. Note that if the number of data signals received from the signal separation unit 107 differs from the number of data signals indicated by the information received from the control unit 101, the IDFT unit 108 may perform signal interpolation processing or signal thinning processing in the IDFT processing. In this case, the number of signals output from the IDFT unit 108 may be the number of data signals indicated by the information received from the 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 the configuration of mobile station 200 according to the first embodiment.

[0059] In FIG. 6 , mobile station 200 includes control unit 201, coding / modulation unit 202, DFT unit 203, signal allocation unit 204, transmission unit 205, antenna 206, reception unit 207, signal separation unit 208, and demodulation / decoding unit 209.

[0060] The control unit 201 acquires 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 uplink signals. 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, if the number indicating the amount of resources allocated to the mobile station 200 includes a prime factor that is different from a specific number, the control unit 201 controls the transmission process assuming that the resources allocated to the mobile station 200 are different from the resources onto 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 to which data signals are mapped, their positions, and the number of data signals to a value different from the allocated resources. For example, the control unit 201 may change at least one of the number of subcarriers, their positions, and the number of data signals included in the allocation resource information. The changed information (the above-mentioned allocation resource information) indicates the resources to which the data signals are allocated (mapped) and / or the number of uplink data signals to be transmitted. Furthermore, for example, the changed number of data signals 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. Furthermore, 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] Receiving section 207 performs radio reception processing such as frequency conversion (for example, down-conversion) of the signal received from antenna 206, and outputs the signal that has undergone radio reception processing to signal separating section 208.

[0065] The signal separator 208 extracts a downlink data signal and / or control information (e.g., DCI) 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 control information is allocated, and extracts the downlink data signal and / or 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] The coding and modulation unit 202 performs error correction coding and modulation on the uplink data based on the information on the number of data signals received from the control unit 201 , and outputs the data to the DFT unit 203 .

[0068] DFT section 203 performs DFT processing (for example, FFT processing) on ​​the signal received from encoding / modulating section 202 and outputs the data signal to signal allocating section 204 .

[0069] Signal allocation section 204 allocates the data signals received from DFT section 203 in the time-frequency domain based on the resource allocation information received from control section 201. The allocated signals are output to the transmitting section.

[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 base station 100 and 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 onto which the mobile station 200 maps uplink data signals may be referred to as "allocated resources." Furthermore, when resources are represented by subcarriers, the allocated resources and 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 signals to be transmitted and / or the resources onto which the data signals are mapped (ST104). Adjusting the size of the data signals to be transmitted may be, for example, adjusting (changing) the number of data signals to be transmitted. Adjusting the resources onto which the data signals are mapped may be, for example, adjusting (changing) the amount of resources onto which the data signals are mapped and / or the positions of the resources. As described above, the resources onto which the data signals are mapped may correspond to allocation resources. Mobile station 200 then performs the processing of ST105.

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

[0080] After the processing in ST102, base station 100 determines whether the number of allocated subcarriers has prime factors different from a specific number (ST106).

[0081] If the number of allocated subcarriers does not have a prime factor different from the specific number (NO in ST106), base station 100 performs the receiving process 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). Adjusting the size of the received data signal may be, for example, adjusting (changing) the number of received data signals. Adjusting the resource to which the data signal is mapped may be, for example, adjusting (changing) the amount of resources to which the data signal is mapped and / or the position of the resources. 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 processing in ST108.

[0083] The mobile station 200 transmits an uplink signal, and the base station 100 receives the uplink signal (ST108).

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

[0085] Next, an example of setting resources allocated by base station 100 to mobile station 200 and an example of setting resources to which mobile station 200 maps data signals will be described.

[0086] [First example of allocation and allocation 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, taking as an example a case where 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 transmits, to mobile station 200, allocation resource information indicating that the allocated resources are interlaces #0 and #10, using DCI and / or higher layer signaling.

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

[0092] Then, control unit 201 determines whether the number of allocated subcarriers includes a prime factor different from the specific number. For example, if the specific numbers are 2, 3, and 5, the number of allocated subcarriers is 204 = 2 × 2 × 3 × 17, so control unit 201 determines that the number of allocated 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 prime factors different from a specific number (i.e., a number whose prime factors contain only specific numbers) as the number of data signals output from the DFT unit 203. In addition to this, the control unit 201 may set the number of allocated subcarriers to the same number as the set number of data signals.

[0095] For example, the number of data signals and the number of allocated subcarriers may be set to the maximum number among numbers that are equal to or less than the number of allocated subcarriers and that do not contain prime factors different from a specific number.

[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 largest number among numbers that do not contain prime factors 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 to

[0099] Then, the control unit 201 sets the positions of the allocated subcarriers among the allocated subcarriers. The method for setting the positions of the allocated subcarriers is not particularly limited. For example, any of 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 allocated subcarriers. In the above example, of the 204 subcarriers, 200 subcarriers located on the higher frequency side are set as allocated subcarriers, and the four subcarriers located on the lower frequency side are not set as 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 lower frequency side of the allocated subcarriers as allocated subcarriers. In the above example, of the 204 subcarriers, 200 subcarriers located on the lower frequency side are set as allocated subcarriers, and the 4 subcarriers located on the higher frequency side are not set as allocated subcarriers.

[0102] <Setting method 3> For example, the control unit 201 may set the allocated subcarriers, excluding those on the low frequency side and the high frequency side, as allocated subcarriers. In the above example, of the 204 subcarriers, 200 subcarriers, excluding two subcarriers located on the high frequency side and two subcarriers located on the low frequency side, are set as 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 setting methods 1 to 3, allocation subcarriers are set on at least one of the low-frequency side and the high-frequency side of the allocated subcarriers. This method maintains a uniform frequency interval between PRBs in the allocation resources, and can suppress degradation of the PAPR of the uplink signal. In addition, interference from adjacent bands can be suppressed on the side where allocation resources (allocation subcarriers) are not set.

[0104] <Setting method 4> For example, the control unit 201 may set the subcarriers, excluding the subcarriers located in the central portion, of the allocated subcarriers as allocated subcarriers. The subcarriers located in the central portion may be, for example, 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 portion, of the allocated subcarriers are set as allocated subcarriers, the highest and lowest frequencies 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 prevents the occupied channel bandwidth (OCB) of the allocated subcarriers from being narrower than the bandwidth of the allocated subcarriers, reducing the possibility of violating the OCB restrictions defined by ETSI.

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

[0107] In configuration method 5, the occupied bandwidth (OCB) of the allocated subcarriers can be secured by the interlaces to which the excluded subcarriers do not belong, reducing the possibility of violating the OCB restrictions specified by ETSI. For example, by selecting an interlace that contains fewer subcarriers before the exclusion for a specific interlace from which subcarriers are excluded, the possibility of violating the OCB restrictions specified by ETSI can be further reduced. In addition, the frequency spacing of the PRBs of the allocation resources can be kept uniform, reducing the degradation 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. The control unit 201 also 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 result to the DFT unit 203. The DFT unit 203 performs DFT processing (e.g., FFT processing) on ​​the signals corresponding to the number of data signals received from the coding and modulation unit 202, and outputs the output signals to the signal allocation unit 204. Here, the number of data signals is a number that does not contain prime factors different from the 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 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] Furthermore, 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 that in 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 that in 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 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 contain prime factors different from the specific number (2, 3, and 5 in the above example), so that an increase in the amount of calculation for the IDFT processing (e.g., IFFT processing) in the IDFT unit 108 can be suppressed, and the IDFT processing can be speeded up.

[0113] In the above-described example, by determining the number of data signals and allocation resources on a subcarrier-by-subcarrier basis, it is possible to improve the frequency utilization efficiency of allocated resources and perform flexible mapping of data signals. For example, a signal different from the uplink data signal may be mapped to resources that are not set as allocation resources.

[0114] The number of data signals and allocation resources is not limited to a subcarrier unit. For example, the number of data signals and allocation resources may be determined in units of sub-PRBs, each of which has a smaller number of subcarriers than a PRB (i.e., less than 12 subcarriers). A sub-PRB may be referred to as a part of PRB, or may be considered to correspond to another name.

[0115] Alternatively, the number of data signals and allocation resources may be determined in units of PRB. A second example in which the number of data signals and allocation resources is determined in units of PRB will be described below.

[0116] [Second example of allocation and allocation resources] When the number of data signals and allocation resources is determined in units of PRB, 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. Control unit 201 then sets K, which corresponds to the determined number, as the number of PRBs in the allocation resources.

[0117] For example, as in the example described above, when determining the allocation resources for the allocation resources shown in Figure 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 resources.

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

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

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

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

[0122] When determining allocation resources on a PRB-by-PRB basis, the frequency spacing of the PRBs in the allocated resources remains uniform, as in the case of determining allocation resources on a subcarrier-by-subcarrier basis, and this can suppress degradation of the PAPR of the data signal.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 implementation in mobile station 200 and base station 100 easy.

[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 contain a prime factor different from a specific number (2, 3, and 5 in the above example) 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 also makes it possible to use resources efficiently, thereby enabling appropriate transmission and reception of signals in operation in unlicensed bands.

[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 the 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 thereof will be omitted. Hereinafter, the second embodiment will be described by referring to 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 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 201 controls the transmission process assuming that the resources allocated to the mobile station 200 and the resources onto which the uplink data signal is mapped are different.

[0128] For example, if 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 subcarriers to which data signals are mapped to a value different from the allocated 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 be the same 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 portion of the allocated subcarriers excluding 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 overlapping allocated subcarriers overlap with one 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 overlapping allocated 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, control unit 201 determines whether the number of allocated subcarriers includes a prime factor different from the specific number. For example, if the specific numbers are 2, 3, and 5, the number of allocated subcarriers is 204 = 2 × 2 × 3 × 17, so control unit 201 determines that the number of allocated 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 prime factors different from a specific number (i.e., a number whose prime factors include only specific numbers).

[0135] For example, the number of data signals and the number of allocated subcarriers may be set to the maximum number among numbers that are equal to or less than the number of allocated subcarriers and that do not contain prime factors different from a specific number.

[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, from the number of allocated subcarriers 204, as overlappingly allocated subcarriers. 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 overlapping allocated subcarriers from among the allocated subcarriers. The method for setting the positions of the allocated subcarriers may be any of setting methods 1 to 5 described in embodiment 1. 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 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 defined for the output of the DFT unit 203. For example, since the DFT process is a time-frequency transform, the defined order may correspond to the frequency in the DFT process.

[0142] For example, when indices #0 to #199 are assigned to 200 data signals output from DFT section 203, the data signals assigned indices #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 subcarrier with the lowest frequency, and then data signals #0 to #3 are mapped repeatedly. 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. The control unit 201 also 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 result 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 signals to the signal allocation unit 204. Here, the number of data signals is a number that does not contain prime factors different from the 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 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 overlapped allocated subcarriers based on the positions of the overlapped allocated subcarriers and information indicating the data signals to be mapped to the overlapped allocated subcarriers.

[0147] Although detailed description will be 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 that in 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 that in the allocated 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 signals being equal to the number of allocation subcarriers, performs IDFT processing (e.g., FFT processing), and outputs the processed signals 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 contain prime factors different from specific numbers (2, 3, and 5 in the above example), so that an increase in the amount of calculation in the IDFT processing (e.g., IFFT processing) in the IDFT unit 108 can be suppressed, and the IDFT processing can be speeded up.

[0149] As described above, in the second embodiment, data signals, the same number as the number of allocated subcarriers, are mapped in a one-to-one correspondence to allocated subcarriers that do not contain prime factors different from a specific number (2, 3, and 5 in the above example) from among the allocated subcarriers. Then, among the allocated subcarriers, data signals are repeatedly mapped to subcarriers different from the allocated subcarriers (overlapping 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, thereby enabling appropriate transmission and reception of signals in operation in unlicensed bands. Furthermore, this prevents the occupied bandwidth (OCB) of the allocated subcarriers from being narrower than the bandwidth of the allocated subcarriers, thereby reducing the possibility of violating the OCB restrictions defined by ETSI.

[0150] Furthermore, in the second embodiment, a part of the data signal is repeatedly transmitted in the frequency domain, thereby improving the reliability of the data signal.

[0151] (Embodiment 3) In the first and second embodiments, examples have been described in which a number indicating the amount of allocation resources is determined. 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, will be 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 thereof will be omitted. Hereinafter, the third embodiment will be described by referring to 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 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 201 controls the transmission process assuming that the resources allocated to the mobile station 200 and the resources onto which the uplink data signal is mapped are different.

[0154] For example, if 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 allocated subcarriers, the positions, and the number of data signals 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 prime factors different from a specific number (i.e., a number whose prime factors include only specific numbers) 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 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 may be set as the number of output data signals.

[0157] Then, control section 201 outputs allocation resource information including the set number of output data signals to signal allocation section 204. Control section 201 also outputs information related to the number of output data signals to coding and 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 / modulation unit 202, and outputs output data signals to signal allocation unit 204. Here, the number of output data signals is a number that does not contain prime factors different from specific numbers (e.g., 2, 3, and 5), so that an increase in the amount of calculation for DFT processing (e.g., FFT processing) in DFT unit 203 can be suppressed, and the DFT processing can be speeded up.

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

[0161] Furthermore, 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 that in 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 that in the allocated resource information based on the same change method.

[0162] An example of the third embodiment will be described below 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, control unit 201 determines whether the number of allocated subcarriers includes a prime factor different from the specific number. For example, if the specific numbers are 2, 3, and 5, the number of allocated subcarriers is 204 = 2 × 2 × 3 × 17, so control unit 201 determines that the number of allocated 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. Also, control unit 201 outputs information regarding the number of output data signals to coding 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 allocated subcarriers. Therefore, the signal allocation unit 204 does not need to map at least 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 contain prime factors different from a specific number (i.e., a number whose prime factors include only specific numbers) is set as the number of data signals output from DFT section 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, allowing signals to be transmitted and received appropriately in operation in unlicensed bands. This method also allows efficient use of allocated subcarriers, improving transmission speed.

[0168] (Fourth embodiment) 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 thereof will be omitted. Hereinafter, 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 unit 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. Control section 201 also outputs information related to the number of output data signals to coding and 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 / modulation unit 202, and outputs output data signals to signal allocation unit 204. Here, the number of output data signals is a number that does not contain prime factors different from specific numbers (e.g., 2, 3, and 5), so that an increase in the amount of calculation for DFT processing (e.g., FFT processing) in DFT unit 203 can be suppressed, and the DFT processing can be speeded up.

[0174] Signal allocation section 204 maps the signals received from DFT section 203. In the case of embodiment 4, as in embodiment 3, the number of signals received from DFT section 203, i.e., the number of output data signals, is greater than the number of assigned subcarriers. In embodiment 4, signal allocation section 204 maps some of the output data signals received from DFT section 203 to resources different from the assigned subcarriers. Hereinafter, output data signals that are 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. The 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 equal to 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 regarding the subcarrier selection method 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, the information regarding the subcarrier selection method 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 surplus data signals to the selected subcarriers based on the allocation resource information.

[0178] Furthermore, 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 that in 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 that in 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 allocated 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 allocated subcarriers. Therefore, the signal allocation unit 204 maps at least 12 surplus data signals to resources different from the allocated 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 contain prime factors different from a specific number (i.e., a number whose prime factors include only specific numbers) is set as the number of data signals output from DFT section 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, allowing signals to be transmitted and received appropriately in operation in unlicensed bands. Furthermore, this method can efficiently use allocated subcarriers and improve transmission speed.

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

[0183] In the above-described fourth embodiment, an example has been described in which resources for mapping surplus data signals are selected in units of subcarriers. Selection in units of subcarriers allows for flexible configuration of resources used for signal transmission.

[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 number of PRBs that can be used to map the surplus data signals from among the PRBs located between the PRBs in the allocated resources. 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 and reception processing can be performed in PRB units, which makes implementation easier.

[0187] (Embodiment 5) In this fifth embodiment, for example, an example will be described in which one of the methods in the first to fourth embodiments is applied based on the number of allocated subcarriers. Note that the methods already explained in the first to fourth embodiments 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 thereof will be omitted. Hereinafter, the fifth embodiment will be described by referring to 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 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 201 controls the transmission process assuming that the resources allocated to the mobile station 200 and the resources onto which the uplink data signal is mapped are different.

[0190] For example, if 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 allocated subcarriers, the positions, and the number of data signals to a value different from the allocated resource information.

[0191] For example, the control unit 201 according to the fifth embodiment may set the number of output data signals output from the DFT unit 203 to the number 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).

[0192] For example, if the set number of 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 the allocated subcarriers, the allocated subcarriers onto which the output data signals are to be mapped.

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

[0194] Also, for example, if 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 to the allocated subcarriers in the same way as in the third and fourth embodiments.

[0195] In this case, output data signals (surplus data signals) that are not mapped to assigned subcarriers may be excluded, as in the third embodiment. Alternatively, output data signals (surplus data signals) that are not mapped to 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 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, control section 201 determines allocation subcarriers to which output data signals are mapped from among the allocated subcarriers, as in Embodiments 1 and 2. Then, as in Embodiment 1, allocated subcarriers that are not included in the allocated subcarriers may not be used. Alternatively, as in Embodiment 2, output data signals may be repeatedly mapped to allocated subcarriers that are not included in the allocated subcarriers.

[0199] As described above, in this fifth embodiment, one of the methods 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 for the DFT process and the IDFT process corresponding to the DFT process, and can efficiently use resources, allowing signals to be transmitted and received appropriately in operation in unlicensed bands. This method also suppresses a decrease in the frequency utilization efficiency and transmission rate of the allocated subcarriers. This method also suppresses an increase in the utilization rate of unallocated resources and a decrease in the reliability of 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 numbers assigned to interlaces with a larger N are larger than 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 numbers 0 to 9 are assigned to interlaces with N=9, and numbers 10 and 11 are assigned to interlaces with N=9. 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, the interlaces with N=11 (i.e., interlaces with 11 PRBs) are numbered 0, 1, 3, 4, 6, and 7, and the interlaces with N=10 (i.e., interlaces with 10 PRBs) are numbered 2, 5, 8, and 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, if interlaces #0, #1, and #2 are assigned to mobile station 200, the total number of PRBs in the allocated resources of mobile station 200 is 32. Since one PRB has 12 subcarriers, the number of allocated subcarriers of mobile station 200 is 384 (=2 7 In this case, the number of subcarriers allocated to mobile station 200 is a number that does not contain any prime factor other than 2, 3, and 5.

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

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

[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, resulting in 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 the second alternative embodiment, the unit of resources constituting an interlace is changed. This change can suppress an increase in the amount of calculation for 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 alternative embodiment, an example has been described in which the resource unit in the low frequency portion is a PRB and the resource unit in the high frequency portion is a sub-PRB. For example, the resource unit in the high frequency portion may be a PRB and the resource unit in the low frequency portion may be a sub-PRB, or PRBs and sub-PRBs may be mixed without being biased in the frequency domain.

[0212] In addition, in the second alternative 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, resource units may be defined by multiple 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-described embodiments, when any part of an interlace included in the allocation resource is a subcarrier group having two or more subcarriers (for example, a 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 that 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 that part.

[0214] Furthermore, the methods described in the above-described embodiments may be used independently 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 another parameter. Furthermore, 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 stations, and the amount of resources allocable to the mobile stations, or may be another parameter.

[0215] Furthermore, in each of the above-described embodiments, examples have 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 adjustment is performed and / or the adjustment method may be predetermined in a standard. For example, the base station and the mobile station may recognize the same method and adjust using the same method.

[0217] Alternatively, 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 allocated resource or interlace number.

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

[0219] In addition, although the operation examples of the above-described embodiments assume the use of DFT processing in the mobile station, the present disclosure is not limited to this. For example, interlaced arrangement may be realized by a CP-OFDM (Cyclic Prefix - Orthogonal Frequency Division Multiplexing) signal waveform.

[0220] Furthermore, in each of the above-described embodiments, an uplink is assumed in which a mobile station corresponds to a transmitter and a base station corresponds to a receiver. However, for example, a downlink may be used in which a base station corresponds to a transmitter and a mobile station corresponds to a receiver. Furthermore, a wireless communication link (e.g., a sidelink) established in communication between mobile stations (e.g., vehicle-to-vehicle communication) may also be used. In this case, the mobile station that performs communication corresponds to a transmitter and a receiver. Alternatively, the present invention is not limited to these, and may be applied to other types of communication.

[0221] Furthermore, in each of the above-described 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] Furthermore, in each of the above-described embodiments, the terms "identify," "decide," "set," "judge," and "assume" may be read interchangeably.

[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-described embodiments, the term "IDFT" may be replaced with a term such as "inverse discrete Fourier transform."

[0227] Furthermore, in 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-described embodiments, the bandwidth of resources defined in the frequency domain, the number of subcarriers, the number of PRBs, etc. are merely examples, and the present disclosure is not limited thereto. Furthermore, the notations defining the units into which resources are divided, such as "subcarrier," "PRB," and "sub-PRB," are merely 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 partially or entirely realized as an LSI, which is an integrated circuit, and each process described in the above embodiments may be partially or entirely controlled by a single LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of a single 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, system LSI, super LSI, or ultra LSI.

[0232] The integrated circuit method is not limited to LSI, but may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Also, a field programmable gate array (FPGA) that can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure the connections and settings of circuit cells within the LSI, may be used. The present disclosure may be realized as digital processing or analog processing.

[0233] Furthermore, if an integrated circuit technology that can replace LSI emerges due to advances in semiconductor technology or other derivative technologies, it is natural that such technology can be used to integrate functional blocks. 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 referred to as communications apparatus), including, but not limited to, telephones (e.g., cell phones, smartphones), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks), cameras (e.g., digital still / video cameras), digital players (e.g., digital audio / video players), wearable devices (e.g., wearable cameras, smartwatches, tracking devices), game consoles, digital book readers, telehealth / telemedicine devices, communications-enabled vehicles or mobile transportation (e.g., cars, airplanes, ships), and combinations of the above.

[0235] Communications equipment is not limited to portable or mobile equipment, but also includes non-portable or fixed equipment, devices, and systems of any kind, such as smart home devices (such as appliances, lighting equipment, smart meters or metering devices, control panels, etc.), vending machines, and any other "things" that may exist on an IoT (Internet of Things) 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] In one embodiment of the present disclosure, a mobile station includes a transmission circuit that transmits an uplink signal; and a control circuit that, 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, controls transmission of a signal of a fourth number using second resources, the fourth number having a prime factor that does not include the third number.

[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, wherein 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 resources to the first resources excluding the third resource.

[0242] In the 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 the highest frequency band and the lowest frequency band among the first resources as the third resource.

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

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

[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 the 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 the mobile station according to an embodiment of the present disclosure, the control circuit determines the second resource on a subcarrier-by-subcarrier basis or on a subcarrier group-by-subcarrier 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 the fourth number to be the number closest to the first number among numbers that have the second number as a prime factor but do not have the third number as a prime factor, and performs different transmission processes depending on whether the first number is greater than the fourth number or 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, the fourth number having a prime factor that does not include the third number, when a first number representing an amount of first resources available for transmitting the uplink signal has a prime factor that is different from a specific second number.

[0252] In one embodiment of the present disclosure, a base station includes a signal separation circuit that separates signals mapped to the second resources, and an inverse discrete Fourier transform circuit that performs an inverse discrete Fourier transform on the separated signals and outputs output signals, and the control circuit sets the number of the output signals to the fourth number and sets the second resources 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 the amount of first resources available for transmitting uplink signals includes a third number in its prime factors that is different from a specific second number, sets a fourth number that does not include the third number in its prime factors, and controls the 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 the amount of first resources available for transmitting uplink signals includes a third number in its prime factors that is different from a specific second number, sets a fourth number that does not include the third number in its prime factors, 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 includes 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 so 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] In one embodiment of the present disclosure, a mobile station includes a transmission circuit that transmits a signal and a control circuit that controls transmission processing of the signal using available first resources, wherein the first resources include one or more bands located at predetermined intervals among multiple bands into which a predetermined frequency band is divided, at least some of the multiple bands have a bandwidth different from that of the remaining bands, and a number representing the amount of resources included in the first resources 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 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 unit 102,202 Encoding 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 stations 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 uplink signal in a first resource block within the band; When the resource allocation information indicates two or more sets of interlace numbers, and when the number of second resource blocks indicated by the two or more sets of 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 largest integer less than or equal to the number of second resource blocks. Communication 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 the 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 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 in a first resource block within the band; When the resource allocation information indicates two or more sets of interlace numbers, and when the number of second resource blocks indicated by the two or more sets of 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 largest integer less than or equal to the number of second resource blocks. Communication method.

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 the 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 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 uplink signal in a first resource block in the band; When the resource allocation information indicates two or more sets of interlace numbers, and when the number of second resource blocks indicated by the two or more sets of 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 largest integer less than or equal to the number of second resource blocks. Integrated circuit.

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