Terminal, communication method, and integrated circuit

Abstract

To allow data communication to be performed appropriately in unlicensed bands.SOLUTION: A terminal includes a receiver that receives first information regarding first resources set for uplink data and second information regarding second resources set for the uplink data, and a control circuit that controls transmission of the uplink data based on the first information and the second information. The first information and the second information are received in one field in one piece of downlink control information.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present disclosure relates to a mobile station, a base station, a receiving method, and a transmitting method.

Background Art

[0002] A communication system called the 5th generation mobile communication system (5G) is being studied. In the 3rd Generation Partnership Project (3GPP), which is an international standardization organization, the enhancement of the LTE / LTE-Advanced system and a new method called New Radio Access Technology (also called New RAT or NR), which is not necessarily backward compatible with the LTE / LTE-Advanced system (see, for example, Non-Patent Document 1), are being considered for the enhancement of the 5G communication system.

[0003] In NR, in addition to the licensed band that requires a license, operation in the unlicensed band (unlicensed band), similar to LTE's License-Assisted Access (LAA) or Enhanced LAA (eLAA), is being considered (see, for example, Non-Patent Document 2). Operation in the unlicensed band is also called, for example, NR-based Access to Unlicensed Spectrum or NR-U.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Non-Patent Document 2

[0005] However, the communication method of data in the unlicensed band has not been sufficiently studied.

[0006] Non-limiting embodiments of the present disclosure contribute to providing a mobile station, a base station, a receiving method, and a transmitting method that can appropriately perform data communication in an unlicensed band. [Means for Solving the Problems]

[0007] A mobile station according to an embodiment of the present disclosure includes a receiving circuit that receives first information regarding a size set for data and second information regarding a resource to which the data is allocated, and a control circuit that controls reception of the data based on the first information and the second information.

[0008] Note that these general or specific aspects may be implemented in a system, apparatus, method, integrated circuit, computer program, or recording medium, or may be implemented in any combination of a system, apparatus, method, integrated circuit, computer program, and recording medium.

Advantages of the Invention

[0009] According to an embodiment of the present disclosure, data communication can be appropriately performed in an unlicensed band.

[0010] Further advantages and effects in an embodiment of the present disclosure will be clarified from the specification and drawings. Such advantages and / or effects are provided by some embodiments and the features described in the specification and drawings respectively, but not all of them are necessarily provided to obtain one or more identical features.

Brief Description of the Drawings

[0011]

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Mode for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0013] [Carrier Sense / Listen Before Talk (LBT)] In the unlicensed band, in order to prevent interference between wireless devices, each wireless device is required to perform carrier sense before transmitting a signal to confirm that no surrounding wireless device is transmitting a signal in the same frequency band.

[0014] In NR-U, similar to eLAA (see, for example, Non-Patent Document 3), it is assumed that carrier sense such as, for example, LBT category 4 (or, Type 1 UL channel access procedure), and LBT category 2 (or, Type 2 UL channel access procedure) is used. In LBT category 2, the period for performing carrier sense (also called LBT duration, for example) is fixed at, for example, 25 microseconds. In LBT category 4, the period for performing carrier sense is, for example, 25 microseconds or more and can be determined randomly.

[0015] Hereinafter, the term "LBT" is used in the sense of carrier sense in NR-U.

[0016] Also, in NR-U, for example, as shown in FIG. 1, a system band (e.g., 80 MHz) is divided into a plurality of bands (e.g., 20 MHz regions, also referred to as sub-bands or sub-bands), and LBT can be performed in each of the sub-bands. In this case, a radio device may operate to transmit a signal in a sub-band where LBT has been completed and not transmit a signal in a sub-band where LBT has not been completed.

[0017] [Downlink Data Allocation (Time Domain)] In NR, for downlink (DL) data transmission, for example, a downlink data channel (e.g., Physical Downlink Shared Channel (PDSCH)) is used.

[0018] In Rel-15 NR, the symbols (e.g., Orthogonal Frequency Division Multiplexing (OFDM) symbols), which are time resources constituting the resources of each PDSCH (hereinafter also referred to as PDSCH resources), are notified from a base station (e.g., also referred to as gNB) to a mobile station (e.g., also referred to as a terminal, User Equipment (UE)) by a downlink control channel (e.g., Physical Downlink Control Channel (PDCCH)).

[0019] For example, the symbols constituting the PDSCH resource are notified to the mobile station by "Time domain resource assignment", which is one of the fields of the downlink control information (e.g., Downlink Control Information (DCI)) transmitted by the PDCCH. This field corresponds to, for example, the Row Index of the "pdsch-TimeDomainAllocationList table" as shown in FIG. 2. In FIG. 2, a value called "Start and Length Indicator Value (SLIV)" is associated with each Row Index. The association between the Row Index and the SLIV is set for the mobile station by, for example, a higher layer. The value of the SLIV corresponds one-to-one with, for example, a combination of two values: "S" indicating the PDSCH allocation start symbol position in a slot and "L" indicating the allocation symbol length (in other words, the number of symbols) (see, for example, Non-Patent Document 4). For example, the mobile station derives the values of S and L from the notified value of the SLIV. The mobile station is instructed that, according to the values of S and L, the PDSCH is allocated from the S-th symbol to the (S + L - 1)-th symbol in the slot, for example.

[0020] FIG. 3 shows, as an example, a configuration example of the PDSCH when the Row index = 0 in FIG. 2 is notified to the mobile station. As shown in FIG. 3, the mobile station determines that the symbols constituting the PDSCH are 12 symbols from the 2nd symbol (S = 2) to the 13th symbol ((S + L - 1) = 13).

[0021] FIG. 4 shows, as another example, a configuration example of the PDSCH when the Row index = 1 in FIG. 2 is notified to the mobile station. As shown in FIG. 4, the mobile station determines that the symbols constituting the PDSCH are 7 symbols from the 7th symbol (S = 7) to the 9th symbol ((S + L - 1) = 13).

[0022] Also in NR-U, the method of instructing the allocation of downlink data in the time domain described above can be applied.

[0023] [Downlink Data Allocation (Frequency Domain)] In Rel-15 NR, the subcarriers, which are the frequency resources constituting each PDSCH resource, are notified to the mobile station by, for example, "Frequency domain resource assignment", which is one of the fields of DCI transmitted by PDCCH.

[0024] In NR-U, in addition to the information notifying this subcarrier, a method of notifying the mobile station which subband to use is also being considered.

[0025] For example, the case where the system band is composed of four subbands as shown in FIG. 1 will be described. In this case, for example, a 4-bit bitmap indicating the usability of each subband may be notified to the mobile station. For example, the 4-bit bitmap may be notified to the mobile station with the subbands used by the mobile station set to "1" and the subbands not used by the mobile station set to "0". As an example, when the mobile station is notified of a bitmap indicating '1110' from the base station, the mobile station may determine to use the three subbands of subband numbers 0 to 2 where the bitmap is "1" and not use the one subband of subband number 3 where the bitmap is "0".

[0026] [Downlink Data Transmission Processing] The base station determines a PDSCH resource (for example, at least one of a time resource and a frequency resource) based on, for example, the size of a transport block (Transport Block (TB)) including downlink data (referred to as TB size or TBS), and a combination of an applicable modulation order and coding rate (for example, Modulation and Coding Scheme (MCS)). For example, the base station notifies the determined PDSCH resource to the mobile station by DCI.

[0027] Also, for example, the base station encodes a transport block (TB) including downlink data and adjusts the number of bits so that the encoded data signal matches the size of the PDSCH resource described above. This process of adjusting the number of bits is called "rate-matching". The base station allocates the rate-matched data signal (hereinafter sometimes referred to as "rate-matching output signal") to the PDSCH resource and transmits the data signal to the mobile station together with DCI.

[0028] The mobile station reads the PDSCH resource from the received DCI. Also, the mobile station derives the size of the transport block (TB size) received in the PDSCH based on the size of the read PDSCH resource (see, for example, Non-Patent Document 4). The mobile station further determines how the downlink data was rate-matched at the base station based on the derived TB size. Thereby, the mobile station can appropriately decode the downlink data.

[0029] The downlink data transmission process has been described above.

[0030] Here, in NR-U, for example, it is assumed that the base station performs LBT before transmitting downlink data (also referred to as a PDSCH signal, for example). For example, the base station starts transmitting downlink data after LBT is completed (in other words, LBT is successful).

[0031] Therefore, the size of the PDSCH resource (hereinafter referred to as "first resource") determined by the base station based on the TB size may be different from the size of the PDSCH resource available after LBT is completed (in other words, the actually allocated PDSCH resource. Hereinafter referred to as "second resource").

[0032] For example, when the size of the second resource is smaller than the size of the first resource, the number of bits of the rate matching output signal is larger than the number of bits that can be transmitted using the second resource. Therefore, for example, a method is being considered in which the base station further deletes (in other words, punctures) some bits of the rate matching output signal and adjusts the number of bits of the rate matching output signal to match the size of the second resource (see, for example, Non-Patent Document 5). This process of adjusting the number of bits may be performed separately from the rate matching described above, for example.

[0033] Also, for example, when the size of the second resource is larger than the size of the first resource, the number of bits of the rate matching output signal is smaller than the number of bits that can be transmitted using the second resource. Therefore, for example, there may be a method in which the base station repeats (in other words, repetition) some bits of the rate matching output signal and adjusts the number of bits of the rate matching output signal to match the size of the second resource. This process of adjusting the number of bits may be performed separately from the rate matching described above, for example.

[0034] However, when adjusting the size (e.g., the number of bits) of the rate matching output signal according to the size of the second resource, the mobile station may not be able to correctly estimate (or derive) the TB size of the downlink data if the first resource is not notified even though the second resource is notified, for example. For this reason, the mobile station may not be able to appropriately decode the downlink data. On the other hand, when adjusting the size of the rate matching output signal according to the size of the second resource, the mobile station may not be able to determine the resource where the PDSCH is actually allocated if the second resource is not notified even though the first resource is notified, for example.

[0035] FIG. 5 shows an example in which the first resource and the second resource are different in the time domain.

[0036] For example, as shown in FIG. 5, the base station may determine 12 symbols from the second symbol to the thirteenth symbol as the first resource based on the TB size, and perform rate matching based on the determined first resource. Also, as shown in FIG. 5, the base station performs LBT, and after completing the LBT before the seventh symbol, may determine 7 symbols from the seventh symbol to the thirteenth symbol as the second resource available for the PDSCH allocation.

[0037] At this time, as shown in FIG. 5, the second resource size (for example, 7 symbols) is smaller than the first resource size (for example, 12 symbols). Therefore, the base station deletes some bits of the rate matching output signal (for example, 5 symbols from the second symbol to the sixth symbol in FIG. 5) and adjusts it to match the second resource size. Thereby, the adjusted signal (for example, 7 symbols from the seventh symbol to the thirteenth symbol) can be arranged in the second resource. Then, in order to notify the mobile station of the PDSCH allocation in the second resource, the base station may notify DCI including information corresponding to S = 7 and L = 7 (for example, SLIV, etc.).

[0038] In this case, the mobile station is notified of information regarding the second resource (for example, S = 7 and L = 7) by the DCI, but information indicating the first resource is not notified. For this reason, the mobile station cannot derive the TB size and cannot determine how the downlink data is rate matched at the base station. For this reason, the mobile station may not be able to appropriately decode the downlink data.

[0039] Next, FIG. 6 shows an example in the case where the first resource and the second resource are different in the frequency domain.

[0040] For example, as shown in FIG. 6, the base station may determine a first resource spanning from the 0th to the 3rd sub-bands based on the TB size, and perform rate matching based on the determined first resource. Also, as shown in FIG. 6, the base station performs LBT, and after completing LBT in the 0th to 2nd sub-bands, determines that a second resource can be used for the allocation of PDSCH in these three sub-bands. In other words, the 3rd sub-band shown in FIG. 6 is determined to be unavailable for the allocation of PDSCH.

[0041] At this time, as shown in FIG. 6, the size of the second resource (for example, 3 sub-bands) is smaller than the size of the first resource (for example, 4 sub-bands). Therefore, the base station deletes some bits of the rate matching output signal (for example, the signal of the 3rd sub-band in FIG. 6) and adjusts it to match the size of the second resource. Thereby, the adjusted signal can be arranged in the second resource. Then, the base station may notify the mobile station of DCI including information indicating the allocation of PDSCH in the second resource (for example, the 0th to 2nd sub-bands).

[0042] In this case, information regarding the second resource is notified to the mobile station, while information regarding the first resource is not notified. For this reason, the mobile station cannot derive the TB size and cannot determine how the downlink data is rate-matched at the base station. For this reason, the mobile station may not be able to appropriately decode the downlink data.

[0043] Thus, in NR-U, regarding the transmission of downlink data, due to the influence of LBT, the first resource determined based on the TB size of the data and the second resource to which the data is actually allocated after the completion of LBT may be different. In other words, in NR-U, the first resource set before the implementation of LBT and the second resource set after the implementation of LBT may be different.

[0044] In this case, even if either the information regarding the first resource or the information regarding the second resource is notified to the mobile station, the mobile station may not be able to appropriately perform reception processing (e.g., data extraction processing or data decoding processing, etc.) on the downlink data.

[0045] Therefore, in one embodiment of the present disclosure, a method for notifying the mobile station from the base station of information regarding the TB size of the downlink data (in other words, the first resource) (hereinafter referred to as "first information"), and information regarding the second resource to which the downlink data is allocated (hereinafter referred to as "second information") will be described. For example, the first information is information determined before the implementation of LBT, and includes information regarding the resource amount of the downlink data before the implementation of LBT (e.g., the resource amount corresponding to the TB size). Also, for example, the second information is information determined based on the result of LBT, and includes information regarding the allocated resource of the downlink data after the implementation of LBT.

[0046] (Embodiment 1) In this embodiment, the transmission of downlink data regarding the time domain of NR-U in the unlicensed band will be described. In other words, in this embodiment, the first resource is a time resource determined based on the TB size set for the downlink data, and the second resource is a time resource allocated to the downlink data.

[0047] [Overview of the communication system] The communication system according to this embodiment includes a base station 100 and a mobile station 200.

[0048] FIG. 7 is a block diagram showing a partial configuration example of the base station 100 according to this embodiment. In the base station 100 shown in FIG. 7, a transmission unit 107 (corresponding to a transmission circuit) transmits first information regarding the size set for the data (e.g., TB size) and second information regarding the resource to which the data is allocated (e.g., the second resource). A control unit 101 (corresponding to a control circuit) controls the transmission of the data based on the first information and the second information.

[0049] FIG. 8 is a block diagram showing a configuration example of a part of the mobile station 200 according to the present embodiment. In the mobile station 200 shown in FIG. 8, a receiving unit 202 (corresponding to a receiving circuit) receives first information regarding the size (e.g., TB size) set in data and second information regarding a resource (e.g., a second resource) to which the data is allocated. A control unit 206 (corresponding to a control circuit) controls the reception of data based on the first information and the second information.

[0050] [Configuration of Base Station] FIG. 9 is a block diagram showing a configuration example of the base station 100 according to the present embodiment. In FIG. 9, the base station 100 includes a control unit 101, an encoding unit 102, a rate matching unit 103, a modulation unit 104, a bit number readjustment unit 105, a signal arrangement unit 106, a transmission unit 107, and an antenna 108.

[0051] The control unit 101 controls the transmission of transmission data (in other words, downlink data), for example. For example, the control unit 101 determines the TB size of the transmission data and outputs information indicating the determined TB size (e.g., referred to as TB size information) to the rate matching unit 103. Further, the control unit 101 determines a PDSCH resource (in other words, a first resource) based on the TB size. Further, the control unit 101 determines, for example, a PDSCH resource (in other words, a second resource) that can actually be used after the completion of LBT. The control unit 101 generates information regarding the PDSCH resource determined based on the TB size (e.g., first information) and information regarding the PDSCH resource determined after the completion of LBT (e.g., second information), and includes at least one of the DCI and the upper layer signal. The control unit 101 outputs the upper layer signal to the encoding unit 102 and outputs the DCI to the signal arrangement unit 106. Further, the control unit 101 outputs PDSCH resource information indicating the PDSCH resource (in other words, the second resource) to the bit number readjustment unit 105 and the signal arrangement unit 106.

[0052] The symbolization unit 102 performs error correction encoding on the transmission data (in other words, the PDSCH signal or the downlink data) and the upper layer signal input from the control unit 101, and outputs the encoded signal to the rate matching unit 103.

[0053] Based on the TB size information input from the control unit 101, the rate matching unit 103 applies rate matching to the signal input from the symbolization unit 102, and outputs the rate-matched signal to the modulation unit 104.

[0054] The modulation unit 104 modulates the signal input from the rate matching unit 103, and outputs the modulated signal to the bit number readjustment unit 105.

[0055] Based on the PDSCH resource information (in other words, the information regarding the second resource) input from the control unit 101, the bit number readjustment unit 105 adjusts the number of bits of the signal input from the modulation unit 104 to match the second resource size, and outputs the signal after bit number adjustment to the signal arrangement unit 106.

[0056] The signal arrangement unit 106 arranges the DCI input from the control unit 101 in, for example, the PDCCH resource. Also, based on the PDSCH resource information input from the control unit 101, the signal arrangement unit 106 arranges the signal input from the bit number readjustment unit 105 in the PDSCH resource (in other words, the second resource). The signal arrangement unit 106 outputs the signal arranged in the resource to the transmission unit 107.

[0057] The transmission unit 107 performs radio transmission processing such as frequency conversion using a carrier wave on the signal input from the signal arrangement unit 106, and outputs the signal after radio transmission processing to the antenna 108.

[0058] The antenna 108 radiates the signal input from the transmission unit 107 (in other words, the downlink signal) toward the mobile station 200.

[0059] [Configuration of the Mobile Station] FIG. 10 is a block diagram showing a configuration example of the mobile station 200 according to the present embodiment. In FIG. 10, the mobile station 200 includes an antenna 201, a receiving unit 202, a signal separation unit 203, a demodulation unit 204, a decoding unit 205, and a control unit 206.

[0060] The antenna 201 receives a downlink signal transmitted by the base station 100 (see, for example, FIG. 9) and outputs it to the receiving unit 202.

[0061] The receiving unit 202 performs radio reception processing such as frequency conversion on the signal input from the antenna 201, and outputs the signal after the radio reception processing to the signal separation unit 203.

[0062] The signal separation unit 203 extracts, for example, DCI arranged in the PDCCH resource from the signal input from the receiving unit 202 and outputs it to the control unit 206. Further, the signal separation unit 203 extracts a data signal arranged in the PDSCH resource based on the PDSCH resource information indicating the PDSCH resource (in other words, the second resource) input from the control unit 206, and outputs it to the demodulation unit 204.

[0063] The demodulation unit 204 demodulates the data signal input from the signal separation unit 203. The demodulation unit 204 outputs the demodulated signal to the decoding unit 205.

[0064] The decoding unit 205 decodes the signal input from the demodulation unit 204 based on the TB size information input from the control unit 206, and obtains a received data signal and a higher layer signal. The decoding unit 205 outputs the higher layer signal to the control unit 206.

[0065] Based on at least one of the DCI input from the signal separation unit 203 and the upper layer signal input from the decoding unit 205, the control unit 206 acquires information regarding the first resource and the second resource. The control unit 206 outputs information regarding the second resource (for example, PDSCH resource information) to the signal separation unit 203. Further, the control unit 206 determines (or figures out) the TB size of the received data based on the information regarding the first resource, and outputs TB size information indicating the TB size to the decoding unit 205.

[0066] [Operation Examples of Base Station 100 and Mobile Station 200] Next, operation examples of the base station 100 (see FIG. 9) and the mobile station 200 (see FIG. 10) will be described.

[0067] Hereinafter, operation examples 1-1 to 1-4 regarding the notification of "first information" regarding the TB size (or the first resource determined based on the TB size) set for the downlink data and "second information" regarding the second resource (for example, PDSCH resource) actually allocated to the downlink data after LBT completion will be described respectively.

[0068] [Operation Example 1-1] In operation example 1-1, the first information and the second information are notified to the mobile station 200 by one parameter. Note that one parameter may be notified, for example, in one DCI (in other words, one control signal), or may be notified in one field within the DCI.

[0069] FIG. 11 is a sequence diagram showing an example of the processing of the base station 100 and the mobile station 200 according to operation example 1-1.

[0070] In FIG. 11, the base station 100 determines, for example, the TB size and MCS of a data signal, and determines a first resource (e.g., time resource) based on the TB size and MCS (ST101). For example, in the example shown in FIG. 5, the base station 100 determines a first resource composed of 12 symbols. Further, the base station 100 performs error correction coding, rate matching, etc. on the data signal based on the first resource (e.g., the number of symbols of the first resource).

[0071] Before transmitting the data signal, the base station 100 performs LBT (ST102). When the LBT is completed, the base station 100 determines a second resource (e.g., time resource) available for transmitting the data signal at the time of LBT completion (ST103). For example, in the example shown in FIG. 5, the base station 100 determines a second resource composed of 7 symbols starting from the 7th symbol in the slot.

[0072] In FIG. 11, the base station 100 determines whether the first resource and the second resource are different (ST104). If the first resource and the second resource are different (ST104: Yes), the base station 100 adjusts the number of bits of the data signal (in other words, the rate matching output signal) so as to match the second resource size (in other words, the resource amount) (ST105). On the other hand, if the first resource and the second resource are not different (ST104: No), the base station 100 performs the process of ST106 without adjusting the number of bits of the data signal.

[0073] For example, in the example shown in FIG. 5, the first resource (12 symbols) and the second resource (7 symbols) are different. Therefore, the base station 100 may, for example, delete a part of the data signal (in other words, puncture) and adjust it to the number of bits that can be arranged in the second resource (7 symbols in FIG. 5).

[0074] Note that, as shown in FIG. 5, not only when the second resource is smaller than the first resource (in other words, when a part of the data signal is deleted), but also when the second resource is larger than the first resource, the base station 100 may adjust the number of bits of the data signal. For example, when the first resource is 7 symbols and the second resource is 12 symbols (not shown), the base station 100 may repeat some bits of the data signal (in other words, repetition) to adjust the number of bits of the data signal so that it is arranged to fill 12 symbols. Note that the case where the second resource is larger than the first resource may be, for example, when the base station 100 determines the first resource assuming an LBT period, but the LBT is completed in a time shorter than the assumed LBT period.

[0075] In FIG. 11, for example, the base station 100 allocates a data signal to the second resource and allocates DCI to the PDCCH resource (ST106). Note that the DCI includes, for example, first information regarding the first resource and second information regarding the second resource. The base station 100 transmits a downlink signal including the data signal and DCI to the mobile station 200 (ST108).

[0076] FIG. 12 shows an example of the first information and the second information included in the DCI according to Operation Example 1-1.

[0077] In FIG. 12, for example, a parameter "L" indicating the length of the first resource (also referred to as size or resource amount. For example, the number of symbols constituting the first resource), a parameter "L" indicating the length of the second resource (also referred to as size or resource amount. For example, the number of symbols constituting the second resource), and a parameter "S" indicating the start position of the second resource (for example, the first symbol position where the second resource is arranged) are set as a plurality of combinations of candidates.

[0078] In FIG. 12, the first information indicates "L of the first resource" representing the resource amount of the first resource. Also in FIG. 12, the second information indicates "L of the second resource" representing the resource amount of the second resource and "S of the second resource" representing the position of the second resource.

[0079] Also in FIG. 12, a Row Index (identification information) is associated with each candidate combination of L of the first resource, L of the second resource, and S of the second resource. The base station 100 and the mobile station 200 share, for example, the association between the Row Index shown in FIG. 12 and the combination of each parameter. For example, the association between the Row Index shown in FIG. 12 and the combination of each parameter may be notified from the base station 100 to the mobile station 200 by a higher layer signal or DCI, or may be defined in a standard.

[0080] The base station 100 notifies the mobile station 200 of a DCI including a Row Index indicating any one of a plurality of candidates for the combination of the first information (L of the first resource) and the second information (L and S of the second resource). As an example, in FIG. 12, when the first resource has 12 symbols and the second resource has 7 symbols starting from the 7th symbol of the slot, the base station 100 notifies the mobile station 200 of a DCI including Row Index = 1.

[0081] In FIG. 11, the mobile station 200 extracts a data signal assigned to the second resource based on the second information included in the DCI received from the base station 100 (ST108). For example, in FIG. 12, when Row Index = 1 (for example, L of the second resource = 12 and S of the second resource = 7) is notified by the DCI, the mobile station 200 may determine that the second resource has 7 symbols starting from the 7th symbol in the slot, and extract the data signal in the 7 symbols corresponding to the second resource.

[0082] Also, the mobile station 200 specifies (or in other words, determines) the TB size of the data signal based on the first information included in the DCI received from the base station 100 (ST109). For example, in FIG. 12, when Row Index = 1 (e.g., L = 12 of the first resource) is notified by the DCI, the mobile station 200 determines that the first resource has 12 symbols and calculates the TB size corresponding to 12 symbols (see, for example, Non-Patent Document 4).

[0083] The mobile station 200 demodulates and decodes the extracted data signal based on the calculated TB size (ST110).

[0084] The above is an example of the data transmission and reception method in the base station 100 and the mobile station 200 according to Operation Example 1-1.

[0085] According to Operation Example 1-1, even when the first resource and the second resource are different, the mobile station 200 can specify the allocated resource of the data signal and the TB size set for the data signal, and can appropriately perform reception processing (e.g., data extraction and decoding) on the data signal.

[0086] Also, according to Operation Example 1-1, the base station 100 can notify the mobile station 200 of the first information and the second information by one parameter (e.g., Row Index shown in FIG. 12). Therefore, the overhead of the DCI can be reduced.

[0087] Note that in FIG. 12, the case where L of the second resource and S of the second resource are set to different parameters (in other words, different columns of the table shown in FIG. 12) has been described, but the present invention is not limited to this. For example, as shown in FIG. 13, L of the second resource and S of the second resource may be set by SLIV, similar to FIG. 2. Also in the method shown in FIG. 13, the mobile station 200 can appropriately decode the data signal based on the information on the TB size (in other words, the first resource) and the allocated resource (in other words, the second resource) for the data signal. Further, in FIG. 13, compared with FIG. 12, since the number of parameters is smaller, the overhead of the upper layer signal can be reduced.

[0088] Also in FIG. 13, the case where L of the second resource and S of the second resource are set to SLIV has been described, but the present invention is not limited to this. For example, L of the first resource and S of the second resource may be set to SLIV, and L of the second resource may be set to an individual value. Even in this case, the mobile station 200 can appropriately decode the data signal based on the information on the TB size (in other words, the first resource) and the allocated resource (in other words, the second resource) for the data signal. Also in this case, compared with FIG. 12, since the number of parameters is smaller, the overhead of the upper layer signal can be reduced.

[0089] <Operation Example 1-2> In Operation Example 1-1, the case where the first information and the second information are notified by one parameter has been described. In contrast, in Operation Example 1-2, the first information and the second information are notified by different parameters. Note that the parameters indicating the first information and the second information may be notified, for example, in different DCIs (in other words, different control signals), or may be notified in different fields within one DCI.

[0090] Note that the processing of the base station 100 and the mobile station 200 in Operation Example 1-2 is the same as that in Operation Example 1-1 (see FIG. 11, for example), and the information regarding the first resource and the second resource included in the DCI (in other words, the configuration of the DCI) is different.

[0091] For example, the first information is included in the first DCI (or referred to as the first DCI field), and the second information is included in a second DCI (or referred to as the second DCI field) different from the first DCI.

[0092] For example, the first DCI includes at least a parameter "L" indicating the length of the first resource (for example, the number of symbols constituting the first resource).

[0093] Also, for example, the second DCI includes at least a parameter "L" indicating the length of the second resource (for example, the number of symbols constituting the second resource) and a parameter "S" indicating the start position of the second resource (for example, the first symbol position where the second resource is arranged).

[0094] FIG. 14 shows an example of the second information included in the second DCI according to Operation Example 1-2.

[0095] In FIG. 14, for example, a plurality of candidates for the combination of L of the second resource and S of the second resource are set.

[0096] Also, in FIG. 14, each candidate for the combination of L of the second resource and S of the second resource is associated with a Row Index. The base station 100 and the mobile station 200 share, for example, the association between the Row Index shown in FIG. 14 and the combination of each parameter. For example, the association between the Row Index shown in FIG. 14 and the combination of each parameter may be notified from the base station 100 to the mobile station 200 by a higher layer signal or DCI, or may be defined in the standard.

[0097] The base station 100 notifies the mobile station 200 of a first DCI including first information (e.g., L of a first resource) and a second DCI including second information (L and S of a second resource), respectively. As an example, when the first resource has 12 symbols and the second resource has 7 symbols starting from the 7th symbol of a slot, the base station 100 notifies the mobile station 200 of a first DCI including L = 12 and a second DCI including Row Index = 1 shown in FIG. 14.

[0098] According to Operation Example 1-2, similar to Operation Example 1-1, even when the first resource and the second resource are different, the mobile station 200 can identify the allocated resource of the data signal and the TB size set for the data signal, and can appropriately perform reception processing (e.g., data extraction and decoding) on the data signal.

[0099] Also, according to Operation Example 1-2, the base station 100 can notify the mobile station 200 of the first information and the second information independently. Therefore, the base station 100 can set each of the first resource (in other words, the TB size) and the second resource more flexibly.

[0100] Note that in FIG. 14, the case where L of the second resource and S of the second resource are set to different parameters (in other words, different columns of the table shown in FIG. 14) has been described, but it is not limited thereto. For example, as shown in FIG. 15, L of the second resource and S of the second resource may be set and notified by SLIV, similar to FIG. 2. Also in the method shown in FIG. 15, the mobile station 200 can appropriately decode the data signal based on the information on the TB size (in other words, the first resource) and the allocated resource (in other words, the second resource) for the data signal. Further, in FIG. 15, compared with FIG. 14, the number of parameters is smaller, so the overhead of the upper layer signal can be reduced.

[0101] In FIG. 14, the case where the L of the second resource and the S of the second resource are notified by one DCI (or one DCI field) has been described, but the present invention is not limited thereto. For example, the L of the first resource, the L of the second resource, and the S of the second resource may be notified in different DCIs (or DCI fields). Alternatively, the base station 100 may notify the mobile station 200 of the L of the first resource and the S of the second resource by combining them as shown in FIG. 14 or FIG. 15 and using one DCI (for example, one DCI including a Row Index), and notify the mobile station 200 of the L of the second resource by another DCI. Even in such a method, the mobile station 200 can appropriately decode the data signal based on the information on the TB size and the allocated resources.

[0102] <Operation Example 1-3> In Operation Example 1-3, either one of the first information and the second information is notified by a higher layer signal, and the other information is notified by a DCI.

[0103] FIG. 16 is a sequence diagram showing an example of the processing of the base station 100 and the mobile station 200 according to Operation Example 1-3. In FIG. 16, the same operations as those in Operation Example 1-1 (for example, FIG. 11) are denoted by the same reference numerals, and the description thereof is omitted.

[0104] As shown in FIG. 16, the base station 100 may determine the second resource before performing LBT (ST102) (ST103).

[0105] The base station 100 notifies the mobile station 200 of a higher layer signal including either one of the first information regarding the first resource and the second information regarding the second resource (ST201). Further, the base station 100 notifies the mobile station 200 of a DCI including information indicating the other of the first information and the second information (ST202).

[0106] For example, when the first information is notified to the mobile station 200 by the upper layer signal, the base station 100 may determine the second resource after the LBT of ST102 in the same manner as in FIG. 11, and notify the mobile station 200 of the DCI including the second information regarding the determined second resource.

[0107] The mobile station 200 derives the first resource (or TB size) and the second resource based on the first information and the second information notified by the upper layer signal and the DCI from the base station 100. Further, the mobile station 200 performs data reception processing (for example, data extraction and decoding) based on the first resource and the second resource in the same manner as in Operation Example 1-1.

[0108] According to Operation Example 1-3, similar to Operation Example 1-1, even when the first resource and the second resource are different, the mobile station 200 can specify the allocated resource of the data signal and the TB size set for the data signal, and can appropriately perform reception processing (for example, data extraction and decoding) on the data signal.

[0109] Further, according to Operation Example 1-3, since either one of the first information and the second information is notified to the mobile station 200 by the upper layer signal, the overhead of the DCI can be reduced.

[0110] Note that both the first information and the second information may be notified to the mobile station 200 by the upper layer signal. In this case, the notification by the DCI becomes unnecessary, and the signaling can be reduced.

[0111] Further, at least one of the first information and the second information may be a fixed value. The fixed value is shared, for example, by the base station 100 and the mobile station 200. In this case, the notification of either one of the first information and the second information becomes unnecessary, and the amount of signaling can be reduced.

[0112] <Operation Example 1-4> In Operation Examples 1-4, either the first information or the second information is explicitly notified, and the other information is implicitly notified.

[0113] Hereinafter, an example in which the second information is explicitly notified and the first information is implicitly notified will be described. Note that the first information may be explicitly notified and the second information may be implicitly notified.

[0114] FIG. 17 is a sequence diagram showing an example of the processing of the base station 100 and the mobile station 200 according to Operation Examples 1-4. In FIG. 17, the same operations as those in Operation Example 1-1 (for example, FIG. 11) are denoted by the same reference numerals, and the description thereof is omitted.

[0115] In FIG. 17, before performing LBT (ST102), the base station 100 sets, for example, a plurality of candidates for the first resource (ST301). The base station 100 may also generate rate matching output signals corresponding to each candidate for the first resource.

[0116] The base station 100 notifies the mobile station 200 of information regarding the set candidates for the first resource by, for example, a higher layer signal (ST302). Note that the information regarding the candidates for the first resource is not limited to a higher layer signal and may be notified by other signaling (for example, DCI), or may be a fixed value shared by the base station 100 and the mobile station 200.

[0117] After performing LBT (ST102) and determining the second resource (ST103), the base station 100 selects a candidate corresponding to the second resource from among the candidates for the first resource (ST303). For example, the base station 100 may select a candidate having a size (for example, the closest size) close to the size of the second resource from among the candidates for the first resource. The base station 100 also selects the rate matching output signal corresponding to the selected candidate for the first resource.

[0118] The base station 100 transmits (ST304) to the mobile station 200, for example, a DCI including second information regarding a second resource and a data signal (for example, a data signal corresponding to the candidate selected in ST303).

[0119] Similar to ST303, the mobile station 200 selects, from among the candidates of the first resource, a candidate having a size close to the size of the second resource notified by the DCI (ST305). For example, the mobile station 200 may select, from among a plurality of candidates of the first resource, the candidate having the size closest to the size of the second resource. In this way, the mobile station 200 determines the first information based on the second information included in the received DCI. In other words, the first information is implicitly notified to the mobile station 200 by the second information included in the DCI.

[0120] The mobile station 200 specifies the TB size of the received data signal (ST109) based on the selected candidate of the first resource, and demodulates and decodes the data signal (ST110).

[0121] According to Operation Examples 1-4, similar to Operation Example 1-1, even when the first resource and the second resource are different, the mobile station 200 can specify the allocated resource of the data signal and the TB size set for the data signal, and can appropriately perform reception processing (for example, data extraction and decoding) on the data signal.

[0122] Also, according to Operation Examples 1-4, since the first information is not explicitly notified, the overhead of the DCI can be reduced.

[0123] Also, according to Operation Examples 1-4, for example, the candidate of the first resource (in other words, the TB size) is determined according to the second resource determined after the completion of LBT. Therefore, since the TB size is determined according to the available second resource based on the result of LBT, the resource utilization efficiency can be improved.

[0124] In addition, in Operation Examples 1-4, the case where the base station 100 and the mobile station 200 select, from among a plurality of candidates for the first resource, the candidate closest to the size of the second resource has been described. However, the candidate selection method is not limited to this. For example, the base station 100 and the mobile station 200 may select, from among a plurality of candidates for the first resource, the candidate having the largest size among those smaller than the size of the second resource. Alternatively, the base station 100 and the mobile station 200 may select, from among a plurality of candidates for the first resource, the candidate having the smallest size among those larger than the size of the second resource. By such a method as well, the base station 100 and the mobile station 200 can set the optimal TB size corresponding to the available second resource.

[0125] Also, in Operation Examples 1-4, the case where a plurality of candidates for the first resource are set has been described. However, a plurality of candidates may be set for the second resource as well. For example, the base station 100 selects one candidate having a size close to that of the first resource from among the candidates for the second resource. The base station 100 may notify the mobile station 200 of first information regarding the first resource. Based on the notified first information, the mobile station 200 may select one candidate having a size close to that of the first resource from among the known candidates for the second resource, and may specify the data allocation position based on the selected candidate. By such a method as well, the mobile station 200 can appropriately decode the data signal based on the information on the TB size and the allocated resource.

[0126] The above has described Operation Examples 1-1 to 1-4.

[0127] As described above, in this embodiment, the base station 100 notifies the mobile station 200 of first information regarding the TB size set for the data (in other words, information regarding the first resource) and second information regarding the second resource determined after the completion of LBT. The mobile station 200 controls the reception of the data signal (for example, specifying the allocated resource of the data signal, deriving the TB size, and decoding the data signal) based on the first information and the second information notified from the base station 100.

[0128] Thus, for example, even when the first resource determined based on the TB size of the data is different from the second resource to which the data is actually allocated due to the influence of LBT, the mobile station 200 can derive the TB size and determine how the downlink data is rate-matched at the base station 100.

[0129] Therefore, according to the present embodiment, the mobile station 200 can appropriately receive and decode the downlink data. As described above, according to the present embodiment, the base station 100 and the mobile station 200 can appropriately perform data communication in an unlicensed band such as NR-U.

[0130] (Variation of Embodiment 1) Note that in Embodiment 1, the first information is not limited to indicating the number of symbols constituting the first resource. For example, the first information may indicate "the difference between the number of symbols constituting the first resource and the number of symbols constituting the second resource". For example, the mobile station 200 may estimate the size (e.g., the number of symbols) of the first resource based on the first information including the above difference and the second information including the second resource size, and specify the TB size. Also by this method, the mobile station 200 can appropriately decode the data based on the TB size and the information of the allocated resource. In other words, the information regarding the first resource only needs to include information for specifying the size of the first resource.

[0131] Also, in Embodiment 1, the first information is not limited to indicating the number of symbols constituting the first resource. For example, the first information may indicate the TB size set for the mobile station 200. Also by this method, the mobile station 200 can appropriately decode the data based on the TB size and the information of the allocated resource.

[0132] In addition, in Embodiment 1, the second information is not limited to indicating a combination of "the position of the first symbol of the second resource (start position S)" and "the number of symbols constituting the second resource (L)". For example, the second information may indicate a combination of "the position of the first symbol of the second resource (start position S)" and "the position of the last symbol of the second resource (end position)". In other words, the second information only needs to include information for specifying the size and position of the second resource.

[0133] Also, the "position of the last symbol of the second resource" may be implicitly notified to the mobile station 200, for example, by information indicating the configuration of Channel Occupancy Time (COT) or information indicating the slot format (e.g., Slot Format Indicator (SFI)). For example, the base station 100 may notify the mobile station 200, using the COT configuration notification or SFI, that "the last symbol in which the downlink signal is transmitted is the Xth symbol". The mobile station 200 may determine that the second resource ends at the Xth symbol based on the received COT configuration notification or SFT.

[0134] Even by such a method, the mobile station 200 can identify the allocated resources and can appropriately decode the data. In addition, since the information regarding the second resource is notified simultaneously with the COT configuration or the slot format, the overhead of the DCI can be reduced.

[0135] In addition, in Embodiment 1, the "position of the first symbol of the second resource" assumes the symbol number, that is, the absolute position, but other expression methods may also be used. For example, the position of the first symbol of the second resource may be represented by the relative position from the resource where the DCI is arranged, that is, the offset value. Even by such a method, the mobile station 200 can identify the allocated resources and can appropriately decode the data.

[0136] In addition, in Embodiment 1, the first information was described in the case of indicating the number of symbols constituting the first resource, but it is not limited to this. For example, similar to the second information, the first information may include, in addition to the number of symbols (in other words, the resource amount), the position of the first symbol of the first resource (in other words, the position of the resource). By such a method, the mobile station 200 can also specify the TB size and can appropriately decode the data.

[0137] In addition, in Embodiment 1, the number of symbols constituting a slot was set to 14, but the number of symbols constituting a slot is not limited to 14 symbols and may be other values (for example, 12).

[0138] (Embodiment 2) In this embodiment, the transmission of downlink data regarding the frequency region of NR-U in the unlicensed band will be described.

[0139] Note that since the base station and the mobile station according to this embodiment have the same basic configuration as the base station 100 and the mobile station 200 according to Embodiment 1, the description will be made by referring to FIGS. 9 and 10.

[0140] Hereinafter, Operation Example 2-1 and Operation Example 2-2 regarding the notification of the first information regarding the TB size (or the first resource determined based on the TB size) set for the downlink data and the second information regarding the second resource (for example, PDSCH resource) actually allocated to the downlink data after LBT completion will be described respectively.

[0141] <Operation Example 2-1> The processing of the base station 100 and the mobile station 200 according to Operation Example 2-1 is the same as that of Operation Example 1-1 (for example, refer to FIG. 11), for example, except that the first resource and the second resource are frequency resources.

[0142] In FIG. 11, for example, the base station 100 determines the TB size and MCS of a data signal, and determines a first resource (e.g., a frequency resource) based on the TB size and MCS (ST101). Here, for example, the base station 100 determines a first resource composed of 10 resource blocks (RBs) #0, #10, …, #90 belonging to each of the 4 sub-bands of sub-bands #0 to #3, that is, a total of 40 RBs (e.g., 480 sub-carriers). Further, the base station 100 performs error correction coding, rate matching, etc. on the data signal based on the first resource (e.g., the number of RBs or the number of sub-carriers of the first resource).

[0143] Before transmitting the data signal, the base station 100 performs LBT (ST102). When the LBT is completed, the base station 100 determines a second resource (e.g., a frequency resource) that can be used for transmitting the data signal at the time of LBT completion (ST103). For example, in the above-described example, the base station 100 determines a second resource composed of 10 RBs #0, #10, …, #90 belonging to each of the 3 sub-bands of sub-bands #0 to #2, that is, a total of 30 RBs (e.g., 360 sub-carriers).

[0144] When the first resource and the second resource are different (ST104: Yes), the base station 100 adjusts the number of bits of the data signal (in other words, the rate matching output signal) so as to match the second resource size (in other words, the resource amount) (ST105). On the other hand, when the first resource and the second resource are not different (ST104: No), the base station 100 performs the process of ST106 without adjusting the number of bits of the data signal.

[0145] For example, in the above-described example, the first resource (40 RBs = 480 sub-carriers) and the second resource (30 RBs = 360 sub-carriers) are different. Therefore, the base station 100 may, for example, delete a part of the data signal (in other words, puncture) and adjust it to the number of bits that can be arranged in 360 sub-carriers.

[0146] Note that, not only when the second resource is smaller than the first resource (in other words, when a part of the data signal is deleted), but also when the second resource is larger than the first resource, the base station 100 may adjust the number of bits of the data signal. For example, when the first resource is 360 subcarriers and the second resource is 480 subcarriers, the base station 100 may repeat a part of the bits of the data signal (in other words, perform repetition) to adjust the number of bits of the data signal so that it is arranged to fill 480 subcarriers.

[0147] The base station 100, for example, allocates the data signal to the second resource and allocates the DCI to the PDCCH resource (ST106). Note that the DCI includes, for example, the first information regarding the first resource and the information regarding the second resource. The base station 100 transmits a downlink signal including the data signal and the DCI to the mobile station 200 (ST108).

[0148] The mobile station 200 extracts the data signal allocated to the second resource based on the information regarding the second resource included in the DCI received from the base station 100 (ST108).

[0149] In addition, the mobile station 200 specifies (in other words, determines) the TB size of the data signal based on the information regarding the first resource included in the DCI received from the base station 100 (ST109). For example, when the mobile station 200 determines based on the DCI that the first resource has 480 subcarriers, the mobile station 200 calculates the TB size corresponding to 480 subcarriers (see, for example, Non-Patent Document 4).

[0150] The mobile station 200 demodulates and decodes the extracted data signal based on the calculated TB size (ST110).

[0151] As described above, an example of the data transmission and reception method in the base station 100 and the mobile station 200 according to the operation example 2-1 has been described.

[0152] According to Operation Example 2-1, even when the first resource and the second resource are different, the mobile station 200 can identify the resource allocated to the data signal and the TB size set for the data signal, and can appropriately perform reception processing (for example, data extraction and decoding) on the data signal.

[0153] Here, the case where the first information indicates the frequency band that is the first resource (for example, information indicating a specific RB within a sub-band) has been described, but it is not limited to this. For example, the first information may indicate the number of sub-carriers constituting the first resource (in other words, the size or resource amount of the first resource). Also by this method, the mobile station 200 can identify the TB size and can appropriately decode the data.

[0154] Alternatively, the first information may indicate, for example, "the difference between the number of sub-carriers constituting the first resource and the number of sub-carriers constituting the second resource". In this case, for example, the mobile station 200 may estimate the size (for example, the number of sub-carriers) of the first resource based on the first information and the second information, and identify the TB size. Also by this method, the mobile station 200 can identify the TB size and can appropriately decode the data.

[0155] <Operation Example 2-2> In Operation Example 2-2, the second information is, for example, information indicating an available sub-band among the first resources (frequency resources. For example, a plurality of sub-bands).

[0156] Note that the processing of the base station 100 and the mobile station 200 in Operation Example 2-2 is the same as that in Operation Example 2-1 (for example, refer to FIG. 11), and the information regarding the second resource included in the DCI is different.

[0157] For example, in the base station 100, when it is determined by LBT that sub-bands #0 to #2 are available and sub-band #3 is unavailable, second information indicating the availability of each sub-band (for example, bitmap '1110') may be notified to the mobile station 200. Further, the base station 100 may notify this second information and the first information (for example, information similar to that in Operation Example 2-1). In other words, the base station 100 notifies the mobile station 200 of first information indicating a frequency resource determined based on the TB size set in the downlink data, and second information indicating at least one band among a plurality of bands included in the frequency resource indicated by the first information.

[0158] When the mobile station 200 receives the first information and the second information, it may determine that "the second resource belongs to the available sub-bands among the notified first resources". Thereby, the mobile station 200 can extract a data signal from the second resource.

[0159] According to Operation Example 2-2, similar to Operation Example 2-1, even when the first resource and the second resource are different, the mobile station 200 can identify the allocated resource of the data signal and the TB size set in the data signal, and can appropriately perform reception processing (for example, data extraction and decoding) on the data signal.

[0160] Further, according to Operation Example 2-2, since the second information does not indicate the size and position of the second resource itself, but indicates the availability (available or unavailable) of each resource, the DCI overhead can be reduced as compared with Operation Example 2-1.

[0161] Note that the resource unit for which availability is indicated in the second information is not limited to sub-bands, and may be other units. For example, the resource unit for which availability is indicated may be a sub-carrier unit, a resource block unit, an interleaving unit, an interleaving cluster unit, etc. Even by this method, the mobile station 200 can appropriately decode data based on the information on the TB size and the allocated resource.

[0162] The above has described operation examples 2-1 to 2-2.

[0163] As described above, in this embodiment, the base station 100 notifies the mobile station 200 of first information regarding the TB size set for data (in other words, information regarding the first resource) and second information regarding the second resource determined after the completion of LBT. The mobile station 200 controls the reception of data signals (for example, specifying the allocated resources of the data signals, deriving the TB size, and decoding the data signals) based on the first information and the second information notified from the base station 100.

[0164] Thereby, for example, even when the first resource determined based on the TB size of the data and the second resource to which the data is actually allocated are different due to the influence of LBT, the mobile station 200 can derive the TB size and can determine how the downlink data is rate-matched at the base station 100.

[0165] Therefore, according to this embodiment, the mobile station 200 can appropriately receive and decode the downlink data. From the above, according to this embodiment, the base station 100 and the mobile station 200 can appropriately perform data communication in an unlicensed band such as NR-U.

[0166] (Variation of Embodiment 2) Note that in Embodiment 2, the first information is not limited to the case of indicating the number of subcarriers constituting the first resource. For example, the first information may indicate the TB size. Even by this method, the mobile station 200 can appropriately decode the data based on the information of the TB size and the allocated resources.

[0167] In addition, in Embodiment 2, it is assumed that one first resource or one second resource is arranged across a plurality of sub-bands. However, the present invention is not limited to this, and the first resource or the second resource may be independently set for each sub-band. Further, in this case, one TB may be transmitted and received across a plurality of sub-bands, or a plurality of different TBs may be transmitted and received between sub-bands.

[0168] As described above, each embodiment of the present disclosure has been described.

[0169] (Other embodiments) One example of the present disclosure described above may be applied in any slot. Alternatively, one example of the present disclosure may be applied to the slot immediately after the completion of LBT and may not be applied to other slots.

[0170] Further, in the above embodiment, in the process of deleting or repeating some bits of a data signal corresponding to the size of the first resource in order to match the second resource, the bit sequence to be deleted or repeated may be the bit sequence at the head of the data signal or the bit sequence at the end. Further, the bit sequence to be deleted or repeated may be, for example, in units of Code Block (CB) or CB Group (CBG).

[0171] Further, in the above embodiment, the case where the base station 100 adjusts the number of bits in a process different from rate matching in order to match the second resource has been described. However, the base station 100 may adjust the number of bits by rate matching in the process for matching the second resource. Thereby, the configuration of the base station 100 can be simplified.

[0172] Also, in the above embodiment, the number of patterns of the control signal indicating the first information (in other words, the information regarding the TB size), or the number of bits of the control signal corresponding to the first information, may be larger than the number of patterns of the control signal indicating the second information (in other words, the information regarding the second resource), or the number of bits of the control signal corresponding to the second information. Thereby, the base station 100 can set the TB size and the first resource more flexibly. Alternatively, the number of patterns of the control signal indicating the second information, or the number of bits of the control signal corresponding to the second information, may be larger than the number of patterns of the control signal indicating the first information, or the number of bits of the control signal corresponding to the first information. Thereby, the base station 100 can set the second resource more flexibly.

[0173] Also, in each of the above embodiments, when there is an interval between after the completion of LBT and the transmission using the second resource, the base station 100 may transmit a reservation signal (for example, also referred to as a reservation signal or a dummy signal) during this interval. Thereby, it is possible to prevent surrounding wireless devices from completing carrier sense (for example, LBT) during this interval and also prevent them from interfering with each other.

[0174] Also, in the above embodiment, the downlink is assumed, but it may be applied to the uplink. Alternatively, it may be applied to communication between mobile stations (for example, device-to-device communication or vehicle-to-vehicle communication), that is, sidelink.

[0175] Also, in each of the above embodiments, the "upper layer signal" may also be referred to as, for example, "RRC signal (RRC signaling)" or "MAC signal (MAC signaling)".

[0176] Also, the DCI in each of the above embodiments may be arranged in a PDCCH (for example, UE-specific PDCCH) that can be received by a certain mobile station, or may be arranged in a PDCCH (for example, Group-common PDCCH) that can be received by a plurality of mobile stations.

[0177] Also, although the case where the first information and the second information in each of the above embodiments indicate parameters (number or position) related to symbols or sub-carriers has been described, the present disclosure is not limited thereto. For example, the first information and the second information may indicate parameters (e.g., resource amount or position of the resource) related to other time resources different from symbols, or other frequency resources different from sub-carriers.

[0178] The present disclosure can be implemented by software, hardware, or software in cooperation with hardware. Each functional block used in the description of the above embodiments can be realized, partially or entirely, as an LSI which is an integrated circuit, and each process described in the above embodiments can be controlled, partially or entirely, by one LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of one chip so as to include a part or all of the functional blocks. The LSI may have data input and output. Depending on the degree of integration, the LSI may also be referred to as an IC, a system LSI, a super LSI, or an ultra LSI. The technique of integrating into an integrated circuit is not limited to LSI, and it may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Further, after manufacturing the LSI, an FPGA (Field Programmable Gate Array) which can be programmed, or a reconfigurable processor capable of reconfiguring the connection and setting of circuit cells inside the LSI may be used. The present disclosure may be realized as digital processing or analog processing. Furthermore, if a technique of integrating into an integrated circuit replacing the LSI appears due to the progress of semiconductor technology or another derived technology, of course, the integration of functional blocks may be performed using that technology. The application of biotechnology or the like is possible as a possibility.

[0179] The present disclosure can be implemented in any type of apparatus, device, system having a communication function (collectively referred to as a communication apparatus). Non-limiting examples of communication apparatuses include telephones (mobile phones, smartphones, etc.), tablets, personal computers (PCs) (laptops, desktops, notebooks, etc.), cameras (digital still / video cameras, etc.), digital players (digital audio / video players, etc.), wearable devices (wearable cameras, smartwatches, tracking devices, etc.), game consoles, digital book readers, telehealth / telemedicine (remote healthcare / medical prescription) devices, vehicles or mobile transportation means having a communication function (automobiles, airplanes, ships, etc.), and combinations of the various apparatuses described above.

[0180] The communication apparatus is not limited to being portable or movable, and includes any type of apparatus, device, system that is not portable or is fixed, such as smart home devices (home appliances, lighting devices, smart meters or measuring devices, control panels, etc.), vending machines, and any other "Things" that can exist on the IoT (Internet of Things) network.

[0181] Communication includes data communication by cellular systems, wireless LAN systems, communication satellite systems, etc., as well as data communication by combinations thereof.

[0182] The communication apparatus also includes devices such as controllers and sensors that are connected or coupled to a communication device that executes the communication function described in the present disclosure. For example, controllers and sensors that generate control signals and data signals used by the communication device that executes the communication function of the communication apparatus are included.

[0183] The communication apparatus also includes infrastructure facilities, such as base stations, access points, and any other apparatus, device, system that communicates with or controls the various apparatuses described above.

[0184] A mobile station according to an embodiment of the present disclosure includes a receiving circuit that receives first information regarding a size set for data and second information regarding a resource to which the data is allocated, and a control circuit that controls reception of the data based on the first information and the second information.

[0185] In an embodiment of the present disclosure, the receiving circuit receives information indicating any one of a plurality of candidates for a combination of the first information and the second information.

[0186] In an embodiment of the present disclosure, the receiving circuit receives different control signals each including the first information and the second information.

[0187] In an embodiment of the present disclosure, the receiving circuit receives an upper layer signal including either one of the first information and the second information, and receives a downlink control signal including the other of the first information and the second information.

[0188] In an embodiment of the present disclosure, the receiving circuit receives a signal including either one of the first information and the second information, and the control circuit determines the other of the first information and the second information based on the either one of the information.

[0189] In an embodiment of the present disclosure, the first information indicates a resource amount of a time resource determined based on a size set for the data.

[0190] In an embodiment of the present disclosure, the first information indicates a difference between a resource amount of a time resource determined based on a size set for the data and a resource amount of a time resource to which the data is allocated.

[0191] In an embodiment of the present disclosure, the first information indicates a size set for the data.

[0192] In one embodiment of the present disclosure, the first information indicates the resource amount of time resources determined based on the size set for the data, and the position of the time resources.

[0193] In one embodiment of the present disclosure, the second information indicates the resource amount of time resources to which the data is allocated, and the position of the time resources.

[0194] In one embodiment of the present disclosure, the second information indicates the start position and the end position of the time resources to which the data is allocated.

[0195] In one embodiment of the present disclosure, the first information indicates frequency resources determined based on the size set for the data.

[0196] In one embodiment of the present disclosure, the first information indicates the resource amount of frequency resources determined based on the size set for the data.

[0197] In one embodiment of the present disclosure, the first information indicates the difference between the resource amount of frequency resources determined based on the size set for the data and the resource amount of frequency resources to which the data is allocated.

[0198] In one embodiment of the present disclosure, the second information indicates the frequency resources to which the data is allocated.

[0199] In one embodiment of the present disclosure, the first information indicates frequency resources determined based on the size set for the data, and the second information indicates at least one band among a plurality of bands included in the frequency resources.

[0200] In one embodiment of the present disclosure, the at least one band is a band determined to be available by carrier sense among the plurality of bands.

[0201] In one embodiment of the present disclosure, the amount of resources determined based on the size set for the data is larger than the amount of resources of the resources to which the data is allocated.

[0202] In one embodiment of the present disclosure, the amount of resources determined based on the size set for the data is smaller than the amount of resources of the resources to which the data is allocated.

[0203] In one embodiment of the present disclosure, the first information is determined before the implementation of carrier sense.

[0204] In one embodiment of the present disclosure, the second information is determined based on the result of carrier sense.

[0205] A base station according to one embodiment of the present disclosure includes a transmission circuit that transmits first information regarding the size set for the data and second information regarding the resources to which the data is allocated, and a control circuit that controls the transmission of the data based on the first information and the second information.

[0206] A reception method according to one embodiment of the present disclosure is a method in which a mobile station receives first information regarding the size set for the data and second information regarding the resources to which the data is allocated, and controls the reception of the data based on the first information and the second information.

[0207] A transmission method according to one embodiment of the present disclosure is a method in which a base station transmits first information regarding the size set for the data and second information regarding the resources to which the data is allocated, and controls the transmission of the data based on the first information and the second information.

Industrial Applicability

[0208] One embodiment of the present disclosure is useful for a mobile communication system.

Description of Signs

[0209] 100 Base Station 101, 206 Control Unit 102 Encoding Unit 103 Rate Matching Unit 104 Modulation Unit 105 Bit Number Readjustment Unit 106 Signal Arrangement Unit 107 Transmission Unit 108, 201 Antenna 200 Mobile Station 203 Signal Separation Unit 204 Demodulation Unit 205 Decoding Unit

Claims

1. A receiver that receives first information regarding a first resource set for uplink data and second information regarding a second resource set for the uplink data; A control circuit that controls transmission of the uplink data based on the first information and the second information; and The first information and the second information are received in one field in one downlink control information. A terminal.

2. When the first resource and the second resource are different, the size of the uplink data is adjusted based on the second information. The terminal according to claim 1.

3. The amount of the first resource is smaller than the amount of the second resource. The terminal according to claim 1.

4. The first information indicates a first time resource related to a transport block size set for the uplink data, and the second information indicates a second time resource related to a resource to which the uplink data is allocated. The terminal according to claim 1.

5. The first information indicates a difference between the amount of the first resource and the amount of the second resource. The terminal according to claim 1.

6. A terminal receives first information regarding a first resource set for uplink data and second information regarding a second resource set for the uplink data, controls transmission of the uplink data based on the first information and the second information, and the first information and the second information are received in one field in downlink control information. A communication method.

7. When the first resource and the second resource are different, adjust the size of the uplink data based on the second information. The communication method according to claim 6.

8. The amount of the first resource is smaller than the amount of the second resource. The communication method according to claim 6.

9. The first information indicates a first time resource related to a transport block size set for the uplink data, and the second information indicates a second time resource related to a resource to which the uplink data is allocated. The communication method according to claim 6.

10. The first information indicates a difference between the amount of the first resource and the amount of the second resource. The communication method according to claim 6.

11. A process of receiving first information regarding a first resource set for uplink data and second information regarding a second resource set for transmission of the uplink data, and A process of controlling transmission of the uplink data based on the first information and the second information, The first information and the second information are received in one field in downlink control information, An integrated circuit.

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