Terminal, base station, and communication method

Abstract

To determines a size of a single piece of control information used for scheduling multiple cells in a wireless communication system.SOLUTION: A terminal includes a receiving unit that receives a single piece of control information for scheduling multiple cells from a base station, and a control unit that determines a bit length of each field corresponding to the scheduling of each of a plurality of cells included in the single pieces of control information on the basis of at least one of the numbers of each information bit necessary for the scheduling of each of the plurality of cells, and the receiving unit obtains the single piece of control information on the basis of the determined bit length of each field.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a terminal and a communication method in a wireless communication system. , base station

Background Art

[0002] In NR (New Radio), which is a successor system to LTE (Long Term Evolution) (also referred to as "5G"), technologies that satisfy requirements such as a large-capacity system, high data transmission speed, low latency, simultaneous connection of a large number of terminals, low cost, and power saving are being studied (for example, Non-Patent Document 1).

[0003] In a case where an NR system is operated in the same band as an existing LTE system, NR-DSS (Dynamic Spectrum Sharing) that coexists the existing LTE system and the NR system in the same band is being studied to improve frequency utilization efficiency (for example, Non-Patent Document 2). In NR-DSS, for example, resources used for transmitting a cell-specific reference signal or a control signal in the LTE system are avoided, and signals of the NR system are transmitted using the remaining resources.

[0004] Also, NR-DSS aims to enhance PDCCH (Physical Downlink Control Channel) for cross-carrier scheduling, for example. As an example, a method of scheduling a PDSCH (Physical Downlink Shared Channel) or a PUSCH (Physical Uplink Shared Channel) of a primary cell or a primary-secondary cell by a PDCCH of a secondary cell has been studied. As another example, a method of scheduling PDSCHs of multiple cells using a single DCI (Downlink Control Information) by a PDCCH of a primary cell, a primary-secondary cell, or a secondary cell has been studied.

Prior Art Documents

Non-Patent Literature

[0005]

Non-Patent Literature 1

Non-Patent Literature 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] When a base station schedules a plurality of serving cells for a terminal, since the RRC (Radio Resource Control) settings of each serving cell are independent, it is assumed that the size of the DCI required for each serving cell to be scheduled is different. Here, when scheduling a plurality of serving cells for a terminal using a single DCI, the size of the single DCI needs to be determined in consideration of the size of the DCI of each serving cell.

[0007] The present invention has been made in view of the above points, and an object thereof is to determine the size of a single control information used for scheduling a plurality of cells in a wireless communication system.

Means for Solving the Problems

[0008] According to the disclosed technology, A terminal having a receiving unit that receives, from a base station, single control information for scheduling downlink shared channels in a plurality of cells, and a control unit that determines the bit length of a first field corresponding to the scheduling of each of the plurality of cells included in the single control information based on the total number of information bits required for each of the plurality of cells, and determines the bit length of a second field corresponding to the scheduling of each of the plurality of cells included in the single control information based on the maximum number of bits among the information bits required for each of the plurality of cells, wherein the receiving unit acquires the single control information based on the bit length of the first field and the bit length of the second field is provided.

Effects of the Invention

[0009] According to the disclosed technology, in a wireless communication system, the size of a single control information used for scheduling a plurality of cells can be determined.

Brief Description of the Drawings

[0010] [Figure 1]It is a diagram showing a configuration example (1) of a wireless communication system in an embodiment of the present invention. [Figure 2] It is a diagram showing a configuration example (2) of a wireless communication system in an embodiment of the present invention. [Figure 3] It is a sequence diagram for explaining an example of signaling in an embodiment of the present invention. [Figure 4] It is a diagram showing an example of cross-carrier scheduling. [Figure 5] It is a flowchart for explaining an example (1) of acquiring DCI in an embodiment of the present invention. [Figure 6] It is a flowchart for explaining an example (2) of acquiring DCI in an embodiment of the present invention. [Figure 7] It is a flowchart for explaining an example (3) of acquiring DCI in an embodiment of the present invention. [Figure 8] It is a flowchart for explaining an example (4) of acquiring DCI in an embodiment of the present invention. [Figure 9] It is a diagram showing an example of the functional configuration of base station 10 in an embodiment of the present invention. [Figure 10] It is a diagram showing an example of the functional configuration of terminal 20 in an embodiment of the present invention. [Figure 11] It is a diagram showing an example of the hardware configuration of base station 10 or terminal 20 in an embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

[0012] In the operation of the wireless communication system according to the embodiment of the present invention, existing technologies are appropriately used. However, the existing technology is, for example, existing LTE, but is not limited to existing LTE. In addition, the term "LTE" used in this specification shall have a broad meaning including LTE-Advanced and subsequent systems (e.g., NR) unless otherwise specified.

[0013] In addition, in the embodiments of the present invention described below, terms such as SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), and PUSCH (Physical Uplink Shared Channel) used in existing LTE are used. This is for convenience of description, and signals, functions, etc. similar to these may be called by other names. Also, the above terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, NR-PDCCH, NR-PDSCH, NR-PUCCH, NR-PUSCH, etc. However, even for signals used in NR, the "NR-" is not necessarily specified.

[0014] In addition, in the embodiment of the present invention, the duplex mode may be a TDD (Time Division Duplex) mode, an FDD (Frequency Division Duplex) mode, or another mode (e.g., Flexible Duplex, etc.).

[0015] In addition, in the embodiments of the present invention, when wireless parameters or the like are "configured", it may mean that predetermined values are pre-configured, or wireless parameters notified from the base station 10 or the terminal 20 may be configured.

[0016] FIG. 1 is a diagram showing a configuration example (1) of a wireless communication system according to an embodiment of the present invention. As shown in FIG. 1, it includes a base station 10 and a terminal 20. In FIG. 1, one base station 10 and one terminal 20 are shown, but this is an example, and there may be a plurality of each. Note that the terminal 20 may be referred to as a "user device". Also, the wireless communication system in the present embodiment may be referred to as an NR-U system.

[0017] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of the wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by a slot or an OFDM symbol, and the frequency domain may be defined by a sub-band, a sub-carrier, or a resource block.

[0018] As shown in FIG. 1, the base station 10 transmits control information or data to the terminal 20 in the DL (Downlink) and receives control information or data from the terminal 20 in the UL (Uplink). Both the base station 10 and the terminal 20 are capable of performing beamforming for signal transmission and reception. Also, both the base station 10 and the terminal 20 are capable of applying communication by MIMO (Multiple Input Multiple Output) to the DL or the UL. Also, both the base station 10 and the terminal 20 may communicate via SCell (Secondary Cell) and PCell (Primary Cell) by CA (Carrier Aggregation).

[0019] The terminal 20 is a communication device having a wireless communication function such as a smartphone, a mobile phone, a tablet, a wearable terminal, a communication module for M2M (Machine-to-Machine), etc. As shown in FIG. 1, the terminal 20 receives control information or data from the base station 10 in DL and transmits control information or data to the base station 10 in UL, thereby using various communication services provided by the wireless communication system.

[0020] FIG. 2 is a diagram showing a configuration example (2) of a wireless communication system according to an embodiment of the present invention. FIG. 2 shows a configuration example of a wireless communication system when NR-DC (NR-Dual connectivity) is executed. As shown in FIG. 2, a base station 10A serving as an MN (Master Node) and a base station 10B serving as an SN (Secondary Node) are provided. The base station 10A and the base station 10B are each connected to the core network 30. The terminal 20 communicates with both the base station 10A and the base station 10B.

[0021] The cell group provided by the base station 10A serving as the MN is called an MCG (Master Cell Group), and the cell group provided by the base station 10B serving as the SN is called an SCG (Secondary Cell Group). The operations described later may be performed with any of the configurations shown in FIGS. 1 and 2.

[0022] Here, NR-DSS aims to enhance, for example, the PDCCH for cross-carrier scheduling. As an example, a method of scheduling the PDSCH (Physical Downlink Shared Channel) or PUSCH (Physical Uplink Shared Channel) of the primary cell or the primary-secondary cell by the PDCCH of the secondary cell is being studied. As another example, a method of scheduling the PDSCHs of multiple cells using a single DCI (Downlink Control Information) by the PDCCH of the primary cell, the primary-secondary cell, or the secondary cell is being studied. Hereinafter, "cell", "carrier", "component carrier (CC)", or "serving cell" may be replaced with each other or may not be distinguished.

[0023] Figure 3 is a sequence diagram for explaining the signaling in the embodiment of the present invention. As shown in Figure 3, in step S1, the base station 10 may transmit system information including a specific IE (Information Element) to the terminal 20. Alternatively, in step S2, the base station 10 may individually transmit RRC (Radio Resource Control) signaling including a specific IE to the terminal 20. Either step S1 or step S2 may be executed, or the execution order may be reversed. The specific IE may be, for example, at least one of SIB1 (System Information Block 1), other SIBs, servingCellConfig, etc. In step S3, the base station 10 schedules the PDSCH or PUSCH of multiple cells or a single cell to the terminal 20 by DCI. In step S4, the terminal 20 executes the scheduled communication with the base station 10.

[0024] FIG. 4 is a diagram showing an example of cross-carrier scheduling. As shown in FIG. 4, for example, the PDSCHs of CC#2 and CC#3 are cross-carrier scheduled by DCI transmitted from base station 10 to terminal 20 via the PDCCH of CC#1. The cross-carrier scheduling is an example of scheduling of multiple cells by a single control information. Also, as shown in FIG. 4, for example, the PDSCH of CC#3 is cross-carrier scheduled by DCI transmitted from base station 10 to terminal 20 via the PDCCH of CC#1. The cross-carrier scheduling is an example of scheduling of a single cell by a single control information. Also, as shown in FIG. 4, for example, the PDSCHs of CC#3 and CC#4 are cross-carrier scheduled by DCI transmitted from base station 10 to terminal 20 via the PDCCH of CC#1. The cross-carrier scheduling is an example of scheduling of multiple cells by a single control information. Hereinafter, the scheduled PDSCH may be replaced with a scheduled PUSCH.

[0025] In cross-carrier scheduling, a CIF (Carrier indicator field) is used. The CIF is used to specify the serving cell to be scheduled when the PDCCH of the serving cell schedules the resources of another serving cell. However, in the prior art, there are the following limitations shown in 1)-3).

[0026] 1) In cross-carrier scheduling, it is not possible to schedule the primary cell (PCell). That is, the primary cell is always scheduled by its own PDCCH. 2) When a PDCCH is set for a certain secondary cell (SCell), the secondary cell is always scheduled by its own PDCCH. 3) If PDCCH is not configured for a secondary cell, the PDSCH and PUSCH of the secondary cell are always scheduled by the PDCCH in other serving cells.

[0027] Independent RRC configurations (e.g., PDSCH-Config) in each serving cell are supported. Different RRC configurations may result in different sizes of UE-specific non-fallback DCI. For example, the sizes of DCI format 1_1 and / or DCI format 1_2 in different serving cells may be different.

[0028] Also, conventionally, there were limitations on the values that the size of DCI could take (budget) and the number of PDCCH monitoring, which existed in the scheduled cells. For example, the terminal 20 has the ability to monitor PDCCH candidates for up to 4 sizes of DCI formats, including up to 3 sizes of DCI formats with CRC (Cyclic Redundancy Check) scrambled by the C-RNTI (Cell Radio Network Temporary Identifier) for each serving cell. The terminal 20 counts the number of sizes of DCI formats per serving cell based on the number of PDCCH candidates set in each search space set corresponding to the activated DL-BWP (Bandwidth part).

[0029] On the other hand, in future NR, it is supported to schedule PDSCH for multiple cells from a primary cell, a primary-secondary cell, or a secondary cell using a single DCI. Different upper layer configurations set for each scheduled cell affect the size of the DCI. It is necessary to define a method for determining the size of a single DCI that schedules PDSCH for multiple cells. Also, it is necessary to define a method for counting the size of DCI for the scheduled cells.

[0030] Therefore, a method for determining the size of a single DCI that schedules each PDSCH or PUSCH in a plurality of cells is proposed.

[0031] FIG. 5 is a flowchart for explaining an example (1) of obtaining a DCI in an embodiment of the present invention. Using FIG. 5, the operation of the terminal 20 for obtaining the DCI in step S3 shown in FIG. 3 will be described.

[0032] In step S11, the terminal 20 determines the number of bits of the corresponding field of a single DCI that schedules a plurality of cells based on the number of bits of the field having the largest number of necessary information bits among the fields of the DCI of each cell to be scheduled. Step S11 may be executed for all fields for each field of the DCI. For example, the terminal 20 may determine the bit length of each field of a single DCI that schedules a plurality of cells to be the maximum bit length among the corresponding fields of the plurality of cells.

[0033] For example, when scheduling cells CC#x and CC#y by a single DCI, the following mathematical formula A) and / or mathematical formula B) may be satisfied. A) Size of a certain field of a single DCI = max{Number of information bits required for the corresponding field for scheduling CC#x, Number of information bits required for the corresponding field for scheduling CC#y} B) Size of a single DCI = max{Number of information bits required for scheduling CC#x, Number of information bits required for scheduling CC#y}

[0034] For example, when the size of a field with a single DCI for scheduling a plurality of cells is larger than the size required for the cells to be scheduled, when interpreting the field, the terminal 20 may use the least significant bits (LSB) of the size required for the cells to be scheduled among the field. Alternatively, when interpreting the field, the terminal 20 may use the most significant bits (MSB) of the size required for the cells to be scheduled among the field.

[0035] Subsequently, in step S12, the terminal 20 determines the size of a single DCI for scheduling a plurality of cells based on the number of bits of each determined field. Subsequently, in step S13, the terminal 20 acquires a single DCI based on the determined size of the single DCI.

[0036] FIG. 6 is a flowchart for explaining an example (2) of acquiring a DCI in an embodiment of the present invention. With reference to FIG. 6, the operation of the terminal 20 for acquiring the DCI in step S3 shown in FIG. 3 will be described.

[0037] In step S21, the terminal 20 determines the number of bits of the corresponding field of a single DCI for scheduling a plurality of cells based on the number of bits of the field with the smallest number of necessary information bits among the DCI fields of each cell to be scheduled. Step S21 may be executed for all fields for each DCI field. For example, the terminal 20 may determine the bit length of each field of a single DCI for scheduling a plurality of cells to be the minimum bit length among the corresponding fields of the plurality of cells.

[0038] For example, when scheduling to cells CC#x and CC#y by a single DCI, the following mathematical formula C) and / or mathematical formula D) may be satisfied. C) Size of a field with a single DCI = min{number of information bits required for the corresponding field for scheduling on CC#x, number of information bits required for the corresponding field for scheduling on CC#y} D) Size of a single DCI = min{number of information bits required for scheduling on CC#x, number of information bits required for scheduling on CC#y}

[0039] For example, when the size of a field with a single DCI for scheduling multiple cells is smaller than the size required for the cells to be scheduled, the terminal 20 may add zero "0" to the beginning of the field until it reaches the size required for interpreting the field when interpreting the field. Alternatively, the terminal 20 may add zero "0" to the end of the field until it reaches the size required for interpreting the field when interpreting the field.

[0040] Subsequently, in step S22, the terminal 20 determines the size of a single DCI for scheduling multiple cells based on the number of bits of each determined field. Subsequently, in step S23, the terminal 20 obtains a single DCI based on the determined size of the single DCI.

[0041] FIG. 7 is a flowchart for explaining an example (3) of obtaining a DCI in an embodiment of the present invention. The operation of the terminal 20 for obtaining the DCI in step S3 shown in FIG. 3 will be described with reference to FIG. 7.

[0042] In step S31, the terminal 20 determines the number of bits of a single DCI for scheduling multiple cells based on the number of information bits required for the cells to be scheduled. Subsequently, in step S32, the terminal 20 obtains a single DCI based on the determined size of the single DCI.

[0043] The bit length of each field of the single DCI may be the bit length required for the field of the cell to be scheduled.

[0044] For example, when the size of a field of a single DCI for scheduling multiple cells is larger than the size required for the cells to be scheduled, when interpreting the field, the terminal 20 may use the LSB (Least significant bits) of the size required for the multiple cells to be scheduled in the field. Alternatively, when interpreting the field, the terminal 20 may use the MSB (Most significant bits) of the size required for the cells to be scheduled in the field.

[0045] For example, when the size of a field of a single DCI for scheduling multiple cells is smaller than the size required for the cells to be scheduled, when interpreting the field, the terminal 20 may add zero "0" to the head of the field until it reaches the size required for interpreting the field. Alternatively, when interpreting the field, the terminal 20 may add zero "0" to the end of the field until it reaches the size required for interpreting the field.

[0046] Alternatively, the terminal 20 may not assume that the bit length of the field included in the DCI format is greater than the bit length of the corresponding field included in the DCI format of the cell to be scheduled in all cells to be scheduled. For example, when the bit length of the field included in the DCI format of the cell to be scheduled is not equal to the bit length of the corresponding field included in the DCI format of the cell to be scheduled, zero "0" may be added to the head of the field until the bit length of the corresponding field included in the DCI format of the cell to be scheduled is equal to the bit length of the field included in the DCI format of the cell to be scheduled.

[0047] FIG. 8 is a flowchart for explaining an example (4) of obtaining DCI in an embodiment of the present invention. The operation of the terminal 20 for obtaining DCI in step S3 shown in FIG. 3 will be described with reference to FIG. 8.

[0048] In step S41, the terminal 20 determines the number of bits of a single DCI for scheduling a plurality of cells based on the number of information bits required for any of the cells to be scheduled. Subsequently, in step S42, the terminal 20 obtains the single DCI based on the determined size of the single DCI.

[0049] The terminal 20 does not need to assume that the bit length of the field included in the DCI format of the cell to be scheduled is different from the bit length of the corresponding field included in the DCI format of other cells to be scheduled.

[0050] Note that the size of the non-fallback single DCI for scheduling PDSCH or PUSCH in a plurality of cells may be counted by the following methods 1)-3).

[0051] 1) The size of the single DCI is counted in any one of the cells to be scheduled. Any one of the cells to be scheduled may be the cell with the smallest cell index or the largest cell index. 2) The size of the single DCI is counted in all the cells to be scheduled. 3) The size of the single DCI is counted in the cell to be scheduled.

[0052] Note that the sizes of some fields of the non-fallback single DCI that schedules PDSCH or PUSCH in multiple cells may be determined based on the total number of information bits required for each cell to be scheduled. Also, for example, the sizes of some fields of the single DCI may be determined to be twice the number of information bits required for a certain cell to be scheduled in order to ensure flexibility. Also, for example, the sizes of some fields of the single DCI may be determined to be the sum of the sizes of the information bits required for each cell to be scheduled in order to ensure flexibility.

[0053] Note that for the different fields included in the non-fallback single DCI that schedules PDSCH or PUSCH in multiple cells, the methods for obtaining the DCI bit fields described in FIGS. 5, 6, 7, or 8 may be different, or the methods for determining their sizes may be different.

[0054] Note that in the above embodiments, "single DCI" may be replaced with "two or more DCIs".

[0055] According to the above embodiments, the terminal 20 can determine the size of the non-fallback single DCI that schedules PDSCH or PUSCH in multiple cells. Also, the terminal 20 can count the number of sizes of the non-fallback single DCI that schedules PDSCH or PUSCH in multiple cells.

[0056] That is, in a wireless communication system, the size of a single control information used for scheduling multiple cells can be determined.

[0057] (Functional Configuration) Next, an example of the functional configurations of the base station 10 and the terminal 20 that execute the processes and operations described so far will be described. The base station 10 and the terminal 20 include functions for implementing the above-described embodiments. However, the base station 10 and the terminal 20 may each be provided with only some of the functions in the embodiments.

[0058] <Base station 10> FIG. 9 is a diagram showing an example of the functional configuration of the base station 10 in the embodiment of the present invention. As shown in FIG. 9, the base station 10 includes a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in FIG. 9 is merely an example. Any functional classification and name of the functional units may be used as long as the operations according to the embodiment of the present invention can be executed.

[0059] The transmission unit 110 has a function of generating a signal to be transmitted to the terminal 20 side and wirelessly transmitting the signal. Further, the transmission unit 110 transmits an inter-network node message to another network node. The reception unit 120 wirelessly receives various signals transmitted from the terminal 20 and includes a function of obtaining information of a higher layer, for example, from the received signals. Further, the transmission unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, reference signals, etc. to the terminal 20. Further, the reception unit 120 receives an inter-network node message from another network node. The transmission unit 110 and the reception unit 120 may be combined as a communication unit.

[0060] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in a storage device and reads them out from the storage device as necessary. The content of the setting information is, for example, information necessary for DSS technology and cross-carrier scheduling.

[0061] As described in the embodiments, the control unit 140 performs control related to DSS technology. Further, the control unit 140 performs control related to cross-carrier scheduling. A functional unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and a functional unit related to signal reception in the control unit 140 may be included in the reception unit 120.

[0062] <Terminal 20> FIG. 10 is a diagram showing an example of the functional configuration of the terminal 20 in the embodiment of the present invention. As shown in FIG. 10, the terminal 20 includes a transmission unit 210, a reception unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in FIG. 10 is merely an example. As long as the operations according to the embodiment of the present invention can be executed, the functional division and the names of the functional units may be any.

[0063] The transmission unit 210 has a function of creating a transmission signal from transmission data and wirelessly transmitting the transmission signal. The reception unit 220 wirelessly receives various signals and acquires signals of a higher layer from the received physical layer signals. Further, the reception unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals, etc. transmitted from the base station 10. Further, for example, the transmission unit 210 transmits PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel), etc. to another terminal 20 as D2D communication, and the reception unit 220 receives PSCCH, PSSCH, PSDCH or PSBCH, etc. from another terminal 20. The transmission unit 210 and the reception unit 220 may be combined as a communication unit.

[0064] The setting unit 230 stores various setting information received from the base station 10 or the terminal 20 by the reception unit 220 in a storage device and reads it out from the storage device as necessary. Further, the setting unit 230 also stores preset setting information. The content of the setting information is, for example, information necessary for DSS technology and cross-carrier scheduling.

[0065] As described in the embodiments, the control unit 240 performs control related to DSS technology in the terminal 20. Further, the control unit 240 performs control related to cross-carrier scheduling. A functional unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and a functional unit related to signal reception in the control unit 240 may be included in the reception unit 220.

[0066] (Hardware Configuration) The block diagrams (FIGS. 9 and 10) used in the description of the above embodiments show blocks of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (e.g., using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0067] Functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, regarded as, notification (broadcasting), notification (notifying), communication, forwarding, configuration, reconfiguration, allocation (allocating, mapping), assignment, etc. For example, a functional block (component) that functions as transmission is called a transmission unit or a transmitter. In any case, as described above, the realization method is not particularly limited.

[0068] For example, the base station 10, the terminal 20, etc. in one embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 11 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to one embodiment of the present disclosure. The above-described base station 10 and terminal 20 may physically be configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0069] In the following description, the term "device" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0070] Each function in the base station 10 and the terminal 20 is realized by causing the processor 1001 to perform an operation by loading a predetermined software (program) onto hardware such as the processor 1001 and the storage device 1002, and controlling the communication by the communication device 1004, or controlling at least one of reading and writing data in the storage device 1002 and the auxiliary storage device 1003.

[0071] The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the above-described control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0072] Also, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes according to these. As the program, a program for causing a computer to execute at least a part of the operations described in the above-described embodiments is used. For example, the control unit 140 of the base station 10 shown in FIG. 9 may be stored in the storage device 1002 and realized by a control program operating on the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in FIG. 10 may be stored in the storage device 1002 and realized by a control program operating on the processor 1001. Although it has been described that the above-described various processes are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

[0073] The storage device 1002 is a computer-readable recording medium and may be constituted by at least one of, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may be referred to as a register, cache, main memory (main storage device), etc. The storage device 1002 can store a program (program code), software module, etc. executable for implementing the communication method according to an embodiment of the present disclosure.

[0074] The auxiliary storage device 1003 is a computer-readable recording medium, which may be composed of, for example, at least one of an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disc, a digital versatile disc, a Blu-ray (registered trademark) disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. The above-mentioned recording medium may be, for example, a database, a server, or other appropriate media including at least one of the storage device 1002 and the auxiliary storage device 1003.

[0075] The communication device 1004 is hardware (a transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency-division duplexing (FDD: Frequency Division Duplex) and time-division duplexing (TDD: Time Division Duplex). For example, a transmission / reception antenna, an amplifier section, a transmission / reception section, a transmission line interface, etc. may be realized by the communication device 1004. The transmission / reception section may be physically or logically separated into a transmission section and a reception section.

[0076] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives external input. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (e.g., a touch panel).

[0077] Also, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using different buses for each device.

[0078] Also, the base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0079] (Summary of Embodiment) As described above, according to the embodiment of the present invention, there is provided a terminal including a receiving unit that receives information for scheduling a plurality of cells from a base station, and a control unit that determines the size of the information for scheduling the plurality of cells based on at least one of the sizes of the information for scheduling corresponding to each of the plurality of cells, and the receiving unit acquires the information for scheduling the plurality of cells based on the determined size.

[0080] With the above configuration, the terminal 20 can determine the size of a non-fallback single DCI that schedules PDSCH or PUSCH in a plurality of cells. That is, in a wireless communication system, the size of a single control information used for scheduling a plurality of cells can be determined.

[0081] The control unit may determine the size of the information for scheduling the plurality of cells based on the maximum size among the sizes of the information for scheduling corresponding to each of the plurality of cells. With this configuration, the terminal 20 can determine the size of the non-fallback single DCI for scheduling PDSCH or PUSCH in a plurality of cells based on the size of the DCI of the cell to be scheduled.

[0082] When the size required for scheduling the plurality of cells is smaller than the maximum size, the control unit may use the LSB (Least significant bits) or MSB (Most significant bits) among the bits indicating the information for scheduling the plurality of cells corresponding to the maximum size. With this configuration, the terminal 20 can determine the size of the non-fallback single DCI for scheduling PDSCH or PUSCH in a plurality of cells based on the size of the DCI of the cell to be scheduled.

[0083] The control unit may determine the size of the information for scheduling the plurality of cells based on the minimum size among the sizes of the information for scheduling corresponding to each of the plurality of cells. With this configuration, the terminal 20 can determine the size of the non-fallback single DCI for scheduling PDSCH or PUSCH in a plurality of cells based on the size of the DCI of the cell to be scheduled.

[0084] The control unit may determine the size of the information for scheduling the plurality of cells based on the size of the information for scheduling corresponding to any one of the plurality of cells. With this configuration, the terminal 20 can determine the size of the non-fallback single DCI for scheduling PDSCH or PUSCH in a plurality of cells based on the size of the DCI of the cell to be scheduled.

[0085] Also, according to an embodiment of the present invention, a receiving procedure for receiving information for scheduling a plurality of cells from a base station and a control procedure for determining the size of the information for scheduling the plurality of cells based on at least one of the sizes of the information for scheduling corresponding to each of the plurality of cells are executed by a terminal, and the receiving procedure includes a procedure for acquiring the information for scheduling the plurality of cells based on the determined size, and a communication method is provided.

[0086] With the above configuration, the terminal 20 can determine the size of a non-fallback single DCI that schedules PDSCH or PUSCH in a plurality of cells. That is, in a wireless communication system, the size of a single control information used for scheduling a plurality of cells can be determined.

[0087] (Supplement to the embodiment) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, etc. Although specific numerical examples have been used for the purpose of facilitating the understanding of the invention, unless otherwise specified, those numerical values are merely examples and any appropriate values may be used. The classification of items in the above description is not essential to the present invention, and the matters described in two or more items may be used in combination as needed, or the matters described in one item may be applied to the matters described in another item (as long as there is no contradiction). The boundaries of the functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. The operations of a plurality of functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by a plurality of components. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as there is no contradiction. For the sake of convenience in explaining the processing, the base station 10 and the terminal 20 have been described using a functional block diagram, but such devices may be implemented in hardware, software, or a combination thereof. The software that operates by the processor included in the base station 10 according to the embodiment of the present invention and the software that operates by the processor included in the terminal 20 according to the embodiment of the present invention may be stored in a random access memory (RAM), a flash memory, a read-only memory (ROM), an EPROM, an EEPROM, a register, a hard disk drive (HDD), a removable disk, a CD-ROM, a database, a server, or any other appropriate storage medium, respectively.

[0088] In addition, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and other methods may be used. For example, the notification of information may be implemented by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, notification information (MIB (Master Information Block), SIB (System Information Block)), other signals or combinations thereof. Also, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, etc.

[0089] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other suitable systems, and next-generation systems extended based thereon. Also, a plurality of systems may be combined (e.g., a combination of at least one of LTE and LTE-A and 5G, etc.) and applied.

[0090] The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this specification may be reordered as long as there is no contradiction. For example, regarding the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0091] The specific operations assumed to be performed by the base station 10 in this specification may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 can be performed by at least one of the base station 10 and other network nodes other than the base station 10 (for example, but not limited to, MME or S-GW, etc.). Although the case where there is one other network node other than the base station 10 is exemplified above, the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW).

[0092] The information or signals, etc. described in the present disclosure can be output from an upper layer (or lower layer) to a lower layer (or upper layer). They may also be input and output via a plurality of network nodes.

[0093] The input and output information, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. The input and output information, etc. can be overwritten, updated, or appended. The output information, etc. may be deleted. The input information, etc. may be transmitted to other devices.

[0094] The determination in the present disclosure may be made based on a value represented by 1 bit (0 or 1), or may be made based on a Boolean value (true or false), or may be made by comparing numerical values (for example, comparison with a predetermined value).

[0095] Software should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, hardware description language, or by any other name.

[0096] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0097] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be referred to throughout the above description, may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0098] Note that terms described in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, a signal may be a message. Also, a Component Carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0099] The terms "system" and "network" used in this disclosure are used interchangeably.

[0100] Also, the information, parameters, etc. described in this disclosure may be represented using absolute values, relative values from a predetermined value, or using other corresponding information. For example, radio resources may be indicated by an index.

[0101] The names used for the above-described parameters are not limiting names in any way. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in this disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not limiting names in any way.

[0102] In this disclosure, terms such as "base station (BS: Base Station)", "radio base station", "base station device", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. The base station may also be referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0103] The base station can accommodate one or more (e.g., three) cells. When the base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services in this coverage.

[0104] In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" can be used interchangeably.

[0105] The mobile station may also be called by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terms.

[0106] At least one of the base station and the mobile station may also be called a transmission device, a reception device, a communication device, etc. Note that at least one of the base station and the mobile station may also be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or unmanned). Note that at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0107] Also, the base station in the present disclosure may be replaced by a user terminal. For example, for a configuration in which communication between the base station and the user terminal is replaced with communication between a plurality of terminals 20 (which may be referred to as, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the above-described base station 10 may be configured to be functions of the terminal 20. Also, terms such as "uplink" and "downlink" may be replaced with terms corresponding to inter-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be replaced with a side channel.

[0108] Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the functions of the above-described user terminal may be configured to be functions of the base station.

[0109] As used in this disclosure, the terms "determining" and "deciding" may encompass a variety of operations. "Determining" and "deciding" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or another data structure), ascertaining, and considering something as having been "determined" or "decided". Additionally, "determining" and "deciding" may include considering something as having been "determined" or "decided" after receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in memory), and so on. Further, "determining" and "deciding" may include considering something as having been "determined" or "decided" after resolving, selecting, choosing, establishing, comparing, and the like. That is, "determining" and "deciding" may include considering something as having been "determined" or "decided" after performing some operation. Also, "determining (deciding)" may be read as "assuming", "expecting", "considering", etc.

[0110] The terms "connected" or "coupled", or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed". As used in this disclosure, two elements can be considered to be "connected" or "coupled" to each other using at least one of one or more electrical wires, cables, and printed electrical connections, and also, as some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, and optical (both visible and invisible) region, etc.

[0111] The reference signal can also be abbreviated as RS (Reference Signal) and may be called a Pilot depending on the applicable standard.

[0112] As used in this disclosure, the description "based on" does not mean "based only on" unless otherwise specified. In other words, the description "based on" means both "based only on" and "based at least on".

[0113] Any reference to an element using designations such as "first", "second", etc. used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed, or that the first element must precede the second element in any form.

[0114] In the configuration of each of the above devices, "means" may be replaced with "section", "circuit", "device", etc.

[0115] In the present disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0116] A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) independent of numerology.

[0117] Numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, etc.

[0118] A slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A slot may be a time unit based on numerology.

[0119] The slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, the mini-slot may be called a sub-slot. The mini-slot may be composed of a smaller number of symbols than the slot. The PDSCH (or PUSCH) transmitted in a time unit larger than the mini-slot may be called PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the mini-slot may be called PDSCH (or PUSCH) mapping type B.

[0120] The radio frame, sub-frame, slot, mini-slot, and symbol all represent time units when transmitting signals. Different names corresponding to each of them may also be used.

[0121] For example, one sub-frame may be called a Transmission Time Interval (TTI), or a plurality of consecutive sub-frames may be called TTI, or one slot or one mini-slot may be called TTI. That is, at least one of the sub-frame and TTI may be the sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. Note that the unit representing TTI may be called a slot, mini-slot, etc. instead of a sub-frame.

[0122] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used in each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0123] The TTI may be a transmission time unit such as a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit such as scheduling or link adaptation. When the TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a codeword, etc. are actually mapped may be shorter than the TTI.

[0124] Note that when one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit of scheduling. Also, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

[0125] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8 - 12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0126] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of the long TTI and not less than 1 ms.

[0127] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or a plurality of consecutive subcarriers. The number of subcarriers included in the RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in the RB may be determined based on the numerology.

[0128] Also, the time domain of the RB may include one or more symbols, and may be the length of 1 slot, 1 mini-slot, 1 sub-frame, or 1 TTI. 1 TTI, 1 sub-frame, etc. may each be composed of one or more resource blocks.

[0129] Note that one or more RBs may be referred to as physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc.

[0130] Also, the resource block may be composed of one or more resource elements (REs). For example, 1 RE may be a radio resource region of 1 sub-carrier and 1 symbol.

[0131] The bandwidth part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB may be defined in a certain BWP and numbered within that BWP.

[0132] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be set within one carrier for the UE.

[0133] At least one of the set BWPs may be active, and the UE may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0134] The structures such as the above-described radio frames, sub-frames, slots, mini-slots, and symbols are merely examples. For example, the number of sub-frames included in a radio frame, the number of slots per sub-frame or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of sub-carriers included in an RB, and the number of symbols, symbol length, cyclic prefix (CP) length, etc. within a TTI can be changed in various ways.

[0135] In the present disclosure, for example, when articles are added by translation like a, an, and the in English, the present disclosure may include that the nouns following these articles are in the plural form.

[0136] In the present disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separate", "coupled", etc. may also be interpreted in the same way as "different".

[0137] In the present disclosure, each aspect / embodiment described may be used alone, in combination, or switched for use during execution. Also, the notification of predetermined information (for example, the notification of "being X") is not limited to being explicitly performed, and may be performed implicitly (for example, by not performing the notification of the predetermined information).

[0138] Note that in the present disclosure, DCI or the fields included in DCI are an example of the information for scheduling. DCI for scheduling multiple cells is an example of the information for scheduling multiple cells. The DCI of each cell to be scheduled is an example of the information for scheduling corresponding to each of the multiple cells.

[0139] As described above in detail, it is obvious to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modified and changed modes without departing from the spirit and scope of the present disclosure defined by the description of the claims. Therefore, the description of the present disclosure is for illustrative purposes and has no restrictive meaning for the present disclosure.

[0140] <Supplementary Note> Regarding the embodiments described above, it can also be described as follows in the following supplementary note.

[0141] (Supplementary Note 1) A receiving unit that receives information for scheduling a plurality of cells from a base station, A control unit that determines the size of the information for scheduling the plurality of cells based on at least one of the sizes of the information for scheduling corresponding to each of the plurality of cells, The receiving unit is a terminal that acquires the information for scheduling the plurality of cells based on the determined size.

[0142] (Supplementary Note 2) The control unit is the terminal according to Supplementary Note 1 that determines the size of the information for scheduling the plurality of cells based on the maximum size among the sizes of the information for scheduling corresponding to each of the plurality of cells.

[0143] (Supplementary Note 3) The control unit is the terminal according to Supplementary Note 2 that uses the LSB (Least significant bits) among the bits indicating the information for scheduling the plurality of cells corresponding to the maximum size when the size required for scheduling the plurality of cells is smaller than the maximum size.

[0144] (Supplementary Note 4) The terminal according to Appendix 1, wherein the control unit determines the size of the information for scheduling the plurality of cells based on the minimum size among the sizes of the information for scheduling corresponding to each of the plurality of cells.

[0145] (Appendix 5) The terminal according to Appendix 1, wherein the control unit determines the size of the information for scheduling the plurality of cells based on the size of the information for scheduling corresponding to any one of the plurality of cells.

[0146] (Appendix 6) A receiving procedure for receiving information for scheduling a plurality of cells from a base station, a control procedure for determining the size of the information for scheduling the plurality of cells based on at least one of the sizes of the information for scheduling corresponding to each of the plurality of cells, and the terminal executes the procedures, The receiving procedure includes a procedure for acquiring information for scheduling the plurality of cells based on the determined size, and a communication method.

Explanation of Reference Numerals

[0147] 10 Base station 110 Transmitting unit 120 Receiving unit 130 Setting unit 140 Control unit 20 Terminal 210 Transmitting unit 220 Receiving unit 230 Setting unit 240 Control unit 30 Core network 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims

1. A receiving unit that receives single control information for scheduling downlink shared channels in a plurality of cells from a base station; a control unit that determines a bit length of a first field corresponding to the scheduling of each of the plurality of cells included in the single control information based on a total number of information bits required for each of the plurality of cells, and determines a bit length of a second field corresponding to the scheduling of each of the plurality of cells included in the single control information based on a maximum number of information bits required for each of the plurality of cells, The terminal, wherein the receiving unit acquires the single piece of control information based on a bit length of the first field and a bit length of the second field.

2. A terminal as described in claim 1, wherein the control unit counts the size of the single control information in a cell that schedules the multiple cells, or counts the size of the single control information in a scheduled cell included in the multiple cells.

3. A receiving unit that receives single control information for scheduling uplink shared channels in a plurality of cells from a base station; a control unit that determines a bit length of a first field corresponding to the scheduling of each of the plurality of cells included in the single control information based on a total number of information bits required for each of the plurality of cells, and determines a bit length of a second field corresponding to the scheduling of each of the plurality of cells included in the single control information based on a maximum number of information bits required for each of the plurality of cells, The terminal, wherein the receiving unit acquires the single piece of control information based on a bit length of the first field and a bit length of the second field.

4. A transmitter that transmits single control information for scheduling downlink shared channels in a plurality of cells to a terminal; a control unit that determines a bit length of a first field corresponding to the scheduling of each of the plurality of cells included in the single control information based on a total number of information bits required for each of the plurality of cells, and determines a bit length of a second field corresponding to the scheduling of each of the plurality of cells included in the single control information based on a maximum number of information bits required for each of the plurality of cells, A base station, wherein the transmitting unit transmits the single control information based on a bit length of the first field and a bit length of the second field.

5. A step of receiving single control information for scheduling downlink shared channels in a plurality of cells from a base station; determining a bit length of a first field corresponding to the scheduling of each of the plurality of cells included in the single control information based on a total number of information bits required for each of the plurality of cells, and determining a bit length of a second field corresponding to the scheduling of each of the plurality of cells included in the single control information based on a maximum number of information bits required for each of the plurality of cells; and a procedure of acquiring the single control information based on a bit length of the first field and a bit length of the second field, the terminal executing the communication method.

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