JP2024024117A - Terminal and communication method - Google Patents

Abstract

The present invention relates to determining the size of a single piece of control information used for scheduling multiple cells in a wireless communication system. A terminal includes a receiving unit that receives single control information for scheduling a plurality of cells from a base station, and a reception unit that receives from a base station a single control information for scheduling a plurality of cells, and a receiver for each field corresponding to the scheduling of each of the plurality of cells included in the single control information. a control unit that determines a bit length based on at least one of the numbers of each information bit necessary for scheduling each of the plurality of cells; based on the bit length of each field. [Selection diagram] Figure 3

Description

The present invention relates to a terminal and a communication method in a wireless communication system.

The requirements for NR (New Radio) (also referred to as "5G"), which is the successor system to LTE (Long Term Evolution), are a large capacity system, high data transmission speed, low latency, and simultaneous support for a large number of terminals. Techniques that satisfy connectivity, low cost, power saving, etc. are being considered (for example, Non-Patent Document 1).

In cases where the NR system is operated in the same band as the existing LTE system, NR-DSS (Dynamic Spectrum Sharing), which allows the existing LTE system and NR system to coexist in the same band, is being considered in order to improve frequency usage efficiency. (For example, Non-Patent Document 2). In NR-DSS, for example, resources used in the LTE system for transmitting cell-specific reference signals or control signals are avoided, and the remaining resources are used to transmit signals for the NR system.

Furthermore, NR-DSS aims to strengthen 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 using a PDCCH of a secondary cell is being considered. As another example, a method is being considered in which PDSCHs of multiple cells are scheduled using a single DCI (Downlink Control Information) using a PDCCH of a primary cell, a primary secondary cell, or a secondary cell.

3GPP TS 38.300 V15.7.0 (2019-09) 3GPP TSG RAN Meeting #86 RP-193260 (2019-12)

When a base station schedules multiple serving cells to a terminal, the RRC (Radio Resource Control) settings of each serving cell are independent, so it is assumed that the required DCI size will be different for each serving cell to be scheduled. Here, when scheduling a plurality of serving cells to 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.

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

According to the disclosed technology, there is provided a receiving unit that receives single control information for scheduling a plurality of cells from a base station, and a receiving unit that receives from a base station single control information for scheduling a plurality of cells; a control unit that determines a bit length based on at least one of the numbers of each information bit necessary for scheduling each of the plurality of cells; A terminal is provided that obtains the data based on the bit length of each field.

According to the disclosed technology, it is possible to determine the size of a single piece of control information used for scheduling multiple cells in a wireless communication system.

FIG. 1 is a diagram showing a configuration example (1) of a wireless communication system in an embodiment of the present invention. FIG. 2 is a diagram showing a configuration example (2) of a wireless communication system in an embodiment of the present invention. FIG. 3 is a sequence diagram for explaining an example of signaling in an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of cross-carrier scheduling. It is a flowchart for explaining example (1) of acquiring DCI in an embodiment of the present invention. It is a flowchart for explaining example (2) of acquiring DCI in an embodiment of the present invention. It is a flowchart for explaining example (3) of acquiring DCI in an embodiment of the present invention. It is a flowchart for explaining example (4) of acquiring DCI in an embodiment of the present invention. 1 is a diagram showing an example of a functional configuration of a base station 10 in an embodiment of the present invention. It is a diagram showing an example of a functional configuration of a terminal 20 in an embodiment of the present invention. FIG. 2 is a diagram showing an example of the hardware configuration of a base station 10 or a terminal 20 in an embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

Existing techniques are used as appropriate for the operation of the wireless communication system according to the embodiment of the present invention. However, the existing technology is, for example, existing LTE, but is not limited to existing LTE. Further, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and a system after LTE-Advanced (eg, NR) unless otherwise specified.

In addition, in the embodiments of the present invention described below, SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical Terms such as random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), and PUSCH (Physical Uplink Shared Channel) are used. This is for convenience of description, and signals, functions, etc. similar to these may be referred to by other names. Further, the above-mentioned 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 if the signal is used for NR, it is not necessarily specified as "NR-".

Further, in the embodiment of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or another method (for example, Flexible Duplex, etc.). This method may also be used.

Furthermore, in the embodiment of the present invention, "configure" the wireless parameters etc. may mean pre-configuring a predetermined value, or may mean that the base station 10 or Wireless parameters notified from the terminal 20 may also be set.

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. Although one base station 10 and one terminal 20 are shown in FIG. 1, this is just an example, and there may be a plurality of each. Note that the terminal 20 may also be referred to as a "user device." Further, the wireless communication system in this embodiment may be called an NR-U system.

The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. Physical resources of a radio signal are defined in the time domain and frequency domain, where the time domain may be defined in slots or OFDM symbols, and the frequency domain may be defined in subbands, subcarriers, or resource blocks.

As shown in FIG. 1, the base station 10 transmits control information or data to the terminal 20 via DL (Downlink), and receives control information or data from the terminal 20 via UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to transmit and receive signals. Further, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) communication to DL or UL. Further, both the base station 10 and the terminal 20 may communicate via an SCell (Secondary Cell) and a PCell (Primary Cell) using CA (Carrier Aggregation).

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

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. Base station 10A and base station 10B are each connected to core network 30. Terminal 20 communicates with both base station 10A and base station 10B.

A cell group provided by the base station 10A, which is an MN, is called an MCG (Master Cell Group), and a cell group provided by the base station 10B, which is an SN, is called an SCG (Secondary Cell Group). The operations described below may be performed in either configuration of FIG. 1 or FIG. 2.

Here, NR-DSS aims to enhance the PDCCH 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 using a PDCCH of a secondary cell is being considered. As another example, a method is being considered in which PDSCHs of multiple cells are scheduled using a single DCI (Downlink Control Information) using a PDCCH of a primary cell, a primary secondary cell, or a secondary cell. Hereinafter, the terms "cell", "carrier", "component carrier (CC)", and "serving cell" may be replaced with each other or may not be distinguished.

FIG. 3 is a sequence diagram for explaining signaling in the embodiment of the present invention. As shown in FIG. 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 order of execution may be reversed. The specific IE may be, for example, at least one of SIB1 (System Information Block 1), another SIB, servingCellConfig, and the like. In step S3, the base station 10 schedules the PDSCH or PUSCH of multiple cells or a single cell to the terminal 20 using the DCI. In step S4, the terminal 20 performs scheduled communication with the base station 10.

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

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

1) The primary cell (PCell) cannot be scheduled using cross-carrier scheduling. That is, the primary cell is always scheduled by its own PDCCH.
2) When a PDCCH is configured in a certain secondary cell (SCell), the secondary cell is always scheduled by its own PDCCH.
3) If a PDCCH is not configured in a certain secondary cell, the PDSCH and PUSCH of that secondary cell are always scheduled by the PDCCH in another serving cell.

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

Furthermore, conventionally, there has been a limit on the value (budget) that the DCI size can take and a limit on the number of PDCCHs to be monitored in a scheduled cell. For example, the terminal 20 uses PDCCH for DCI formats of up to 4 sizes in total, including DCI formats of up to 3 sizes with CRC (Cyclic Redundancy Check) scrambled with C-RNTI (Cell Radio Network Temporary Identifier) for each serving cell. Has the ability to monitor candidates. The terminal 20 counts the number of DCI format sizes per serving cell based on the number of PDCCH candidates configured in each search space set corresponding to the enabled DL-BWP (Bandwidth part).

On the other hand, future NR will support scheduling PDSCH from a primary cell, primary secondary cell, or secondary cell to multiple cells using a single DCI. Different upper layer settings are configured for each scheduled cell, which affects the size of the DCI. It is necessary to define a method for determining the size of a single DCI for scheduling PDSCHs in multiple cells. It is also necessary to define a method for counting the size of the DCI of a scheduled cell.

Therefore, we propose a method for determining the size of a single DCI for scheduling each PDSCH or PUSCH in multiple cells.

FIG. 5 is a flowchart for explaining an example (1) of acquiring DCI in the embodiment of the present invention. The operation of the terminal 20 that acquires the DCI in step S3 shown in FIG. 3 will be described using FIG. 5.

In step S11, the terminal 20 selects the corresponding field of the single DCI for scheduling multiple cells based on the number of bits of the field having the maximum number of required information bits among the fields of the DCI of each cell to be scheduled. Determine the number of bits in . Step S11 may be executed for every field of the DCI. For example, the terminal 20 may determine the bit length of each field of a single DCI for scheduling multiple cells to be the maximum bit length among corresponding fields of multiple cells.

For example, when scheduling to cell CC#x and cell CC#y using a single DCI, the following formula A) and/or formula B) may be satisfied.
A) Size of a field in a single DCI = max {number of information bits required in the corresponding field for scheduling on CC#x, number of information bits required on the corresponding field for scheduling on CC#y}
B) Single DCI size = max {Number of information bits required to schedule to CC#x, Number of information bits required to schedule to CC#y}

For example, if the size of a certain field of a single DCI that schedules multiple cells is larger than the size required for the scheduled cell, the terminal 20, when interpreting the field, determines the size of the scheduled cell of the field. You may also use LSB (Least Significant Bits) of the size required for. Alternatively, when interpreting the field, the terminal 20 may use the MSB (Most Significant Bits) of the field necessary for the scheduled cell.

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

FIG. 6 is a flowchart for explaining example (2) of acquiring DCI in the embodiment of the present invention. The operation of the terminal 20 that acquires the DCI in step S3 shown in FIG. 3 will be described using FIG. 6.

In step S21, the terminal 20 selects the corresponding field of the single DCI for scheduling multiple cells based on the number of bits of the field having the minimum number of required information bits among the fields of the DCI of each cell to be scheduled. Determine the number of bits in . Step S21 may be executed for every field of the DCI. For example, the terminal 20 may determine the bit length of each field of a single DCI for scheduling multiple cells to be the minimum bit length among corresponding fields of multiple cells.

For example, when scheduling to cell CC#x and cell CC#y using a single DCI, the following formula C) and/or formula D) may be satisfied.
C) Size of a field in a single DCI = min {number of information bits required in the corresponding field for scheduling on CC#x, number of information bits required on the corresponding field for scheduling on CC#y}
D) Single DCI size = min {Number of information bits required to schedule to CC#x, Number of information bits required to schedule to CC#y}

For example, if the size of a field in a single DCI for scheduling multiple cells is smaller than the size required for the scheduled cell, the terminal 20, when interpreting the field, Zeros "0" may be added to the beginning of the field until the field is of a suitable size. Alternatively, when interpreting the field, the terminal 20 may add zeros "0" to the end of the field until it reaches the size required to interpret the field.

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

FIG. 7 is a flowchart for explaining an example (3) of acquiring DCI in the embodiment of the present invention. The operation of the terminal 20 that acquires the DCI in step S3 shown in FIG. 3 will be described using FIG. 7.

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 cell to be scheduled. Subsequently, in step S32, the terminal 20 acquires a single DCI based on the determined single DCI size.

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.

For example, if the size of a certain field in a single DCI that schedules multiple cells is larger than the size required for the scheduled cell, when interpreting the field, the terminal 20 may LSB (Least Significant Bits) of the size required for the cell may be used. Alternatively, when interpreting the field, the terminal 20 may use the MSB (Most Significant Bits) of the field necessary for the scheduled cell.

For example, if the size of a field in a single DCI for scheduling multiple cells is smaller than the size required for the scheduled cell, the terminal 20, when interpreting the field, Zeros "0" may be added to the beginning of the field until the field is of a suitable size. Alternatively, when interpreting the field, the terminal 20 may add zeros "0" to the end of the field until it reaches the size required to interpret the field.

Alternatively, the terminal 20 may not assume that the bit length of the field included in the DCI format is larger than the bit length of the corresponding field included in the DCI format of the scheduling cell in all scheduled cells. . For example, if the bit length of a field included in the DCI format of the scheduled cell is not equal to the bit length of the corresponding field included in the DCI format of the scheduling cell, then the corresponding field included in the DCI format of the scheduling cell Zeros '0' may be added to the beginning of the field until the bit length of the field is equal to the bit length of the field included in the DCI format of the scheduled cell.

FIG. 8 is a flowchart for explaining an example (4) of acquiring DCI in the embodiment of the present invention. The operation of the terminal 20 that acquires the DCI in step S3 shown in FIG. 3 will be described using FIG. 8.

In step S41, 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 any scheduled cell. Subsequently, in step S42, the terminal 20 obtains a single DCI based on the determined single DCI size.

The terminal 20 does not need to assume that the bit length of a field included in the DCI format of a scheduled cell is different from the bit length of a corresponding field included in the DCI format of another scheduled cell.

Note that the size of a non-fallback single DCI for scheduling PDSCH or PUSCH in multiple cells may be counted using methods 1) to 3) below.

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

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

Note that different fields included in a non-fallback single DCI for scheduling PDSCH or PUSCH in multiple cells may be different even if the method of obtaining the DCI bit field explained in FIG. 5, FIG. 6, FIG. 7, or FIG. 8 is different. or the method for determining its size may be different.

Note that in the above embodiment, "single DCI" may be replaced with "two or more DCIs".

According to the embodiments described above, the terminal 20 can determine the size of a non-fallback single DCI for scheduling PDSCH or PUSCH in multiple cells. Additionally, the terminal 20 can count the number of sizes of non-fallback single DCIs that schedule PDSCHs or PUSCHs in multiple cells.

That is, it is possible to determine the size of a single piece of control information used for scheduling multiple cells in a wireless communication system.

(Functional configuration)
Next, an example of the functional configuration of the base station 10 and terminal 20 that execute the processes and operations described above will be described. Base station 10 and terminal 20 include functionality to implement the embodiments described above. However, the base station 10 and the terminal 20 may each have only some of the functions in the embodiment.

<Base station 10>
FIG. 9 is a diagram showing an example of the functional configuration of base station 10 in an embodiment of the present invention. As shown in FIG. 9, base station 10 includes a transmitting section 110, a receiving section 120, a setting section 130, and a control section 140. The functional configuration shown in FIG. 9 is only an example. As long as the operations according to the embodiments of the present invention can be executed, the functional divisions and functional parts may have any names.

The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 side and wirelessly transmitting the signal. The transmitting unit 110 also transmits network node-to-network messages to other network nodes. The receiving unit 120 includes a function of wirelessly receiving various signals transmitted from the terminal 20 and acquiring, for example, information on a higher layer from the received signals. Further, the transmitter 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 receiving unit 120 receives messages between network nodes from other network nodes. The transmitting section 110 and the receiving section 120 may be combined as a communication section.

The setting unit 130 stores preset setting information and various setting information to be sent to the terminal 20 in a storage device, and reads them from the storage device as necessary. The contents of the setting information include, for example, information necessary for DSS technology and cross-carrier scheduling.

The control unit 140 performs control related to the DSS technology, as described in the embodiment. 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 transmitting unit 110, and a functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120.

<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 transmitting section 210, a receiving section 220, a setting section 230, and a control section 240. The functional configuration shown in FIG. 10 is only an example. As long as the operations according to the embodiments of the present invention can be executed, the functional divisions and functional parts may have any names.

The transmitter 210 has a function of creating a transmission signal from transmission data and wirelessly transmitting the transmission signal. The receiving unit 220 receives various signals wirelessly, and obtains higher layer signals from the received physical layer signals. Further, the receiving 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. For example, the transmitting unit 210 transmits a message to another terminal 20 using a PSCCH (Physical Sidelink Control Channel), a PSSCH (Physical Sidelink Shared Channel), a PSDCH (Physical Sidelink Discovery Channel), or a PSBCH (Physical Sidelink Broadcast Channel) as D2D communication. The receiving unit 220 receives PSCCH, PSSCH, PSDCH, PSBCH, etc. from other terminals 20 . The transmitting section 210 and the receiving section 220 may be combined as a communication section.

The setting unit 230 stores various setting information received from the base station 10 or the terminal 20 by the receiving unit 220 in a storage device, and reads it from the storage device as necessary. The setting unit 230 also stores setting information that is set in advance. The contents of the setting information include, for example, information necessary for DSS technology and cross-carrier scheduling.

The control unit 240 performs control related to the DSS technology in the terminal 20, as described in the embodiment. 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 transmitting unit 210, and a functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220.

(Hardware configuration)
The block diagrams (FIGS. 9 and 10) used to explain the above embodiments show blocks in functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or may be realized using two or more physically or logically separated devices directly or indirectly (e.g. , wired, wireless, etc.) and may be realized using a plurality of these devices. The functional block may be realized by combining software with the one device or the plurality of devices.

Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, These include, but are not limited to, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. I can't. For example, a functional block (configuration unit) that performs transmission is called a transmitting unit or a transmitter. In either case, as described above, the implementation method is not particularly limited.

For example, the base station 10, terminal 20, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 11 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and terminal 20 described above are physically 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, etc. Good too.

In addition, in the following description, the word "apparatus" 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 not to include some of the devices.

Each function in the base station 10 and the terminal 20 is performed by loading predetermined software (programs) onto hardware such as the processor 1001 and the storage device 1002, so that the processor 1001 performs calculations and controls communication by the communication device 1004. This is realized by controlling at least one of reading and writing data in the storage device 1002 and the auxiliary storage device 1003.

The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, registers, and the like. For example, the above-described control unit 140, control unit 240, etc. may be implemented by the processor 1001.

Further, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes in accordance with the programs. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, the control unit 140 of the base station 10 shown in FIG. 9 may be realized by a control program stored in the storage device 1002 and operated on the processor 1001. Further, for example, the control unit 240 of the terminal 20 shown in FIG. 10 may be realized by a control program stored in the storage device 1002 and operated on the processor 1001. Although the various processes described above have been described as being executed by one processor 1001, they may be executed by two or more processors 1001 simultaneously or sequentially. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunications line.

The storage device 1002 is a computer-readable recording medium, such as at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. may be configured. The storage device 1002 may be called a register, cache, main memory, or the like. The storage device 1002 can store executable programs (program codes), software modules, and the like to implement a communication method according to an embodiment of the present disclosure.

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

The communication device 1004 is hardware (transmission/reception device) for communicating 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, or the like. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of. For example, a transmitting/receiving antenna, an amplifier section, a transmitting/receiving section, a transmission path interface, etc. may be realized by the communication device 1004. The transmitting and receiving unit may be physically or logically separated into a transmitting unit and a receiving unit.

The input device 1005 is an input device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (for example, 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 (for example, a touch panel).

Further, 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.

The base station 10 and the terminal 20 also 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). A part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these hardwares.

(Summary of embodiments)
As described above, according to the embodiment of the present invention, the receiving unit receives information for scheduling a plurality of cells from a base station, and the size of the information for scheduling the plurality of cells is determined by the size of the information for scheduling the plurality of cells. a control unit that determines based on at least one size of scheduling information corresponding to each cell, and the receiving unit acquires information for scheduling the plurality of cells based on the determined size. is provided.

With the above configuration, the terminal 20 can determine the size of a non-fallback single DCI for scheduling PDSCH or PUSCH in multiple cells. That is, it is possible to determine the size of a single piece of control information used for scheduling multiple cells in a wireless communication system.

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

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

The control unit may determine the size of the information for scheduling the plurality of cells based on the smallest 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 a non-fallback single DCI for scheduling PDSCH or PUSCH in multiple cells based on the size of the DCI of the scheduled cell.

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

Further, 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 scheduling process corresponding to each of the plurality of cells, and a receiving procedure for receiving information for scheduling a plurality of cells from a base station, and a size of the information for scheduling the plurality of cells. the terminal executes a control procedure to determine based on at least one size of information to be transmitted, and the receiving procedure includes a procedure to acquire information for scheduling the plurality of cells based on the determined size. A method is provided.

With the above configuration, the terminal 20 can determine the size of a non-fallback single DCI for scheduling PDSCH or PUSCH in multiple cells. That is, it is possible to determine the size of a single piece of control information used for scheduling multiple cells in a wireless communication system.

(Supplementary information on 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 modifications, modifications, alternatives, replacements, etc. Probably. Although the invention has been explained using specific numerical examples to facilitate understanding of the invention, unless otherwise specified, these numerical values are merely examples, and any appropriate values may be used. The classification of items in the above explanation is not essential to the present invention, and matters described in two or more items may be used in combination as necessary, and matters described in one item may be used in another item. may be applied to the matters described in (unless inconsistent). The boundaries of 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 sections may be physically performed by one component, or the operations of one functional section 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. Although the base station 10 and the terminal 20 have been described using functional block diagrams for convenience of processing description, such devices may be implemented in hardware, software, or a combination thereof. The software that runs on the processor of the base station 10 according to the embodiment of the present invention and the software that runs on the processor that the terminal 20 has according to the embodiment of the present invention are respectively random access memory (RAM), flash memory, and read-only memory. (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

Further, the notification of information is not limited to the aspects/embodiments described in this disclosure, and may be performed using other methods. For example, the notification of information may include 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, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. RRC signaling may also be called an RRC message, for example, RRC It may be a connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like.

Each aspect/embodiment described in this disclosure applies to LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G (5th generation mobile communication system). 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), and systems that utilize and are extended based on these. It may be applied to at least one next generation system. Furthermore, a combination of a plurality of systems may be applied (for example, a combination of at least one of LTE and LTE-A and 5G).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this specification may be changed as long as there is no contradiction. For example, the methods described in this disclosure use an example order to present elements of the various steps and are not limited to the particular order presented.

In this specification, specific operations performed by the base station 10 may be performed by its upper node in some cases. In a network consisting of one or more network nodes including a base station 10, various operations performed for communication with a terminal 20 are performed by the base station 10 and other network nodes other than the base station 10 ( It is clear that this can be done by at least one of the following: for example, MME or S-GW (possible, but not limited to). Although the case where there is one network node other than the base station 10 is illustrated above, the other network node may be a combination of multiple other network nodes (for example, MME and S-GW). .

The information, signals, etc. described in this disclosure may be output from an upper layer (or lower layer) to a lower layer (or upper layer). It may be input/output via multiple network nodes.

The input/output information may be stored in a specific location (eg, memory) or may be managed using a management table. Information etc. to be input/output may be overwritten, updated, or additionally written. The output information etc. may be deleted. The input information etc. may be transmitted to other devices.

The determination in the present disclosure may be performed based on a value represented by 1 bit (0 or 1), a truth value (Boolean: true or false), or a comparison of numerical values (e.g. , comparison with a predetermined value).

Software includes instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name. , should be broadly construed to mean an application, software application, software package, routine, subroutine, object, executable, thread of execution, procedure, function, etc.

Additionally, software, instructions, information, etc. may be sent and received via a transmission medium. For example, if the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to When transmitted from a server or other remote source, these wired and/or wireless technologies are included within the definition of transmission medium.

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 refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may also be represented by a combination of

Note that terms explained 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 the channel and the symbol may be a signal. Also, the signal may be a message. Further, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, or the like.

As used in this disclosure, the terms "system" and "network" are used interchangeably.

In addition, the information, parameters, etc. described in this disclosure may be expressed using absolute values, relative values from a predetermined value, or using other corresponding information. may be expressed. For example, radio resources may be indicated by an index.

The names used for the parameters described above are not restrictive in any respect. Furthermore, the mathematical formulas etc. using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (e.g. PUCCH, PDCCH, etc.) and information elements may be identified by any suitable designation, the various names assigned to these various channels and information elements are in no way exclusive designations. isn't it.

In this disclosure, "Base Station (BS)," "wireless base station," "base station device," "fixed station," "NodeB," "eNodeB (eNB)," and "gNodeB (gNB),” “access point,” “transmission point,” “reception point,” “transmission/reception point,” “cell,” “sector,” Terms such as "cell group," "carrier," "component carrier," and the like may be used interchangeably. A base station is sometimes referred to by terms such as macrocell, small cell, femtocell, and picocell.

A base station can accommodate one or more (eg, three) cells. If a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is divided into multiple subsystems (e.g., small indoor base stations (RRHs)). The term "cell" or "sector" refers to a part or all of the coverage area of a base station and/or base station subsystem that provides communication services in this coverage. refers to

In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably. .

A mobile station is defined by a person 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 It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

At least one of a base station and a mobile station may be called a transmitting device, a receiving device, a communication device, or the like. Note that at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like. The moving object may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving object (for example, a drone, a self-driving car, etc.), or a robot (manned or unmanned). ). Note that at least one of the base station and the mobile station includes devices that do 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.

Furthermore, the base station in the present disclosure may be replaced by a user terminal. For example, communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). Regarding the configuration, each aspect/embodiment of the present disclosure may be applied. In this case, the terminal 20 may have the functions that the base station 10 described above has. Further, words such as "up" and "down" may be replaced with words corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may be replaced with side channels.

Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station may have the functions that the user terminal described above has.

As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of operations. "Judgment" and "decision" include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, and inquiry. (e.g., searching in a table, database, or other data structure), and regarding an ascertaining as a "judgment" or "decision." In addition, "judgment" and "decision" refer to receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and access. (accessing) (e.g., accessing data in memory) may include considering something as a "judgment" or "decision." In addition, "judgment" and "decision" refer to resolving, selecting, choosing, establishing, comparing, etc. as "judgment" and "decision". may be included. In other words, "judgment" and "decision" may include regarding some action as having been "judged" or "determined." Further, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

The terms "connected", "coupled", or any variations thereof, refer to any connection or coupling, direct or indirect, between two or more elements and to each other. It may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled." The bonds or connections between elements may be physical, logical, or a combination thereof. For example, "connection" may be replaced with "access." As used in this disclosure, two elements may include one or more electrical wires, cables, and/or printed electrical connections, as well as in the radio frequency domain, as some non-limiting and non-inclusive examples. , electromagnetic energy having wavelengths in the microwave and optical (both visible and non-visible) ranges.

The reference signal can also be abbreviated as RS (Reference Signal), and may also be called a pilot depending on the applied standard.

As used in this disclosure, the phrase "based on" does not mean "based solely on" unless explicitly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

As used in this disclosure, any reference to elements using the designations "first," "second," etc. does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, reference to a first and second element does not imply that only two elements may be employed or that the first element must precede the second element in any way.

"Means" in the configurations of each of the above devices may be replaced with "unit", "circuit", "device", etc.

Where "include", "including" and variations thereof are used in this disclosure, these terms, like the term "comprising," are inclusive. It is intended that Furthermore, the term "or" as used in this disclosure is not intended to be exclusive or.

A radio frame may be composed of one or more frames in the time domain. Each frame or frames in the time domain may be called a subframe. A subframe may also be composed of one or more slots in the time domain. A subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.

Numerology may be a communication parameter applied to the transmission and/or reception of a signal or channel. Numerology includes, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, and transmitter/receiver. It may also indicate at least one of a specific filtering process performed in the frequency domain, a specific windowing process performed by the transceiver in the time domain, and the like.

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 unit of time based on numerology.

A slot may include multiple minislots. Each minislot may be made up of one or more symbols in the time domain. Furthermore, a mini-slot may also be called a sub-slot. A minislot may be made up of fewer symbols than a slot. PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (or PUSCH) mapping type A. PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (or PUSCH) mapping type B.

Radio frames, subframes, slots, minislots, and symbols all represent time units for transmitting signals. Other names may be used for the radio frame, subframe, slot, minislot, and symbol.

For example, one subframe may be called a Transmission Time Interval (TTI), multiple consecutive subframes may be called a TTI, and one slot or minislot may be called a TTI. It's okay. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. It may be. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each terminal 20) to each terminal 20 on a TTI basis. Note that the definition of TTI is not limited to this.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit of scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (for example, the number of symbols) to which transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.

Note that when one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (minislot number) that constitutes the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI that is shorter than a normal TTI may be referred to as an abbreviated TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, or the like.

Note that long TTI (for example, normal TTI, subframe, etc.) may be read as TTI with a time length exceeding 1 ms, and short TTI (for example, short TTI, etc.) It may also be read as a TTI having the above TTI length.

A resource block (RB) is a resource allocation unit in a time domain and a frequency domain, and may include one or more continuous subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be 12, for example. The number of subcarriers included in an RB may be determined based on newerology.

Additionally, the time domain of an RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI long. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

Note that one or more RBs include physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc. May be called.

Further, a resource block may be configured by one or more resource elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

A Bandwidth Part (BWP) (which may also be called a partial bandwidth or the like) may represent a subset of consecutive common resource blocks (RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by an RB index based on a common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

The BWP may include a UL BWP (UL BWP) and a DL BWP (DL BWP). One or more BWPs may be configured within one carrier for a UE.

At least one of the configured BWPs may be active and the UE may not expect to transmit or receive a given signal/channel outside of the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

The structures of radio frames, subframes, slots, minislots, symbols, etc. described above are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of symbols included in an RB, Configurations such as the number of subcarriers, the number of symbols within a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

In this disclosure, when articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are plural.

In the present disclosure, the term "A and B are different" may mean "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" and "coupled" may also be interpreted similarly to "different."

Each aspect/embodiment described in this disclosure may be used alone, may be used in combination, or may be switched and used in accordance with execution. In addition, notification of prescribed information (for example, notification of "X") is not limited to being done explicitly, but may also be done implicitly (for example, not notifying the prescribed information). Good too.

Note that in the present disclosure, the DCI or the field included in the DCI is an example of information to be scheduled. DCI for scheduling multiple cells is an example of information for scheduling multiple cells. The DCI of each scheduled cell is an example of scheduling information corresponding to each of a plurality of cells.

Although the present disclosure has been described in detail above, it is clear 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 modifications and variations without departing from the spirit and scope of the present disclosure as determined by the claims. Therefore, the description of the present disclosure is for the purpose of illustrative explanation and is not intended to have any limiting meaning on the present disclosure.

<Additional notes>
Regarding the embodiment described above, the following additional notes can be further described.

(Additional 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 scheduling information for the plurality of cells based on at least one of the sizes of scheduling information corresponding to each of the plurality of cells;
The receiving unit is a terminal that acquires information for scheduling the plurality of cells based on the determined size.

(Additional note 2)
The terminal according to supplementary note 1, wherein the control unit determines the size of the information for scheduling the plurality of cells based on the largest size among the sizes of the information for scheduling corresponding to each of the plurality of cells.

(Additional note 3)
When the size required for scheduling the plurality of cells is smaller than the maximum size, the control unit controls the LSB (of bits indicating information for scheduling the plurality of cells corresponding to the maximum size). Terminals described in Appendix 2 that use bits (Least significant bits).

(Additional note 4)
The terminal according to supplementary note 1, wherein the control unit determines the size of the information for scheduling the plurality of cells based on the smallest size among the sizes of the information for scheduling corresponding to each of the plurality of cells.

(Appendix 5)
The terminal according to supplementary note 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.

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

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

Claims (6)

a receiving unit that receives single control information for scheduling multiple cells from a base station;
The bit length of each field corresponding to the scheduling of each of the plurality of cells included in the single control information is determined based on at least one of the numbers of each information bit necessary for the scheduling of each of the plurality of cells. and a control unit to
The receiving unit is a terminal that obtains the single control information based on the determined bit length of each field. 2. The terminal according to claim 1, wherein the control unit determines the maximum number of information bits among the numbers of each information bit as the bit length of each field. When the number of information bits required for scheduling a certain cell among the plurality of cells is smaller than the maximum number of information bits, the control unit determines the least significant bit (LSB) of the field corresponding to the certain cell. 3. The terminal according to claim 2, wherein the terminal uses bits (significant bits). 2. The terminal according to claim 1, wherein the control unit determines the minimum number of information bits among the numbers of each information bit as the bit length of each field. When the number of information bits necessary for scheduling a certain cell among the plurality of cells is larger than the minimum number of information bits, the control unit adds 0 to the beginning of the field corresponding to the certain cell. 5. The terminal according to claim 4, wherein: receiving from a base station single control information for scheduling multiple cells;
The bit length of each field corresponding to the scheduling of each of the plurality of cells included in the single control information is determined based on at least one of the numbers of each information bit necessary for the scheduling of each of the plurality of cells. the steps to
and acquiring the single control information based on the determined bit length of each field.

Images