Terminal, communication system, and communication method

Abstract

To provide a terminal, a communication system, and a communication method that clarify settings related to transmission of an uplink control channel in a wireless communication system.SOLUTION: A terminal receives from a base station RRC (Radio Resource Control) signaling that specifies a cell having a subcarrier spacing different from that of a primary cell as a destination cell of a PUCCH (Physical Uplink Control Channel), and a PDSCH (Physical Downlink Shared Channel), determines a cell different from the primary cell as a destination cell of the PUCCH based on the RRC signaling, and transmits information related to retransmission control corresponding to the PDSCH to the base station in the destination cell of the PUCCH. The terminal holds an accumulated value of closed-loop power control for each cell in transmission power control in the destination cell of the PUCCH.SELECTED DRAWING: Figure 17

Description

[Technical Field]

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

[0002] The 3GPP (3rd Generation Partnership Project) is currently studying a wireless communication system called 5G or NR (New Radio) (hereinafter, this wireless communication system will be referred to as "NR") in order to achieve a larger system capacity, a higher data transmission speed, and a lower latency in wireless sections. In 5G, various wireless technologies and network architectures are being studied to meet the requirements of achieving a throughput of 10 Gbps or more while keeping the latency in wireless sections to 1 ms or less (for example, Non-Patent Document 1).

[0003] Furthermore, in the 3GPP standardization, PUCCH (Physical Uplink Control Channel) carrier switching is being considered as an extension of the URLLC (Ultra-Reliable and Low Latency Communications) technology. For example, PUCCH carrier switching is being considered as a method for reducing the latency of HARQ-ACK (Hybrid Automatic Repeat Request Acknowledgement) feedback in the TDD (Time Division Duplex) system (see, for example, Non-Patent Document 2). [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 38.300 V16.4.0 (2020-12) [Non-patent document 2] 3GPP TSG RAN Meeting #88e, RP-201310, Electronic meeting, June 29-July 3,2020 Summary of the Invention [Problem to be solved by the invention]

[0005] When the cell transmitting the PUCCH is expanded to a secondary cell other than the primary cell, the primary secondary cell group cell, or the PUCCH secondary cell, when PUCCH carrier switching is performed, the settings related to transmitting the PUCCH on the target carrier were not clear.

[0006] The present invention has been made in view of the above points, and has as its object to clarify settings relating to transmission of an uplink control channel in a wireless communication system. [Means for solving the problem]

[0007] According to the disclosed technology, a terminal is provided which includes: a receiver that receives from a base station RRC (Radio Resource Control) signaling and PDSCH (Physical Downlink Shared Channel) specifying a cell that is different from a primary cell as a destination cell of a PUCCH (Physical Uplink Control Channel) and has a subcarrier spacing that is different from that of the primary cell; a controller that determines a cell that is different from the primary cell as a destination cell of the PUCCH based on the RRC signaling; and a transmitter that transmits information related to retransmission control corresponding to the PDSCH to the base station in the destination cell of the PUCCH, wherein the controller holds an accumulated value of closed-loop power control for each cell in transmission power control in the cell to which the PUCCH is sent. [Effects of the Invention]

[0008] According to the disclosed technique, it is possible to clarify settings related to transmission of an uplink control channel in a wireless communication system. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram illustrating an example (1) of a wireless communication system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram illustrating an example (2) of a wireless communication system according to an embodiment of the present invention. [Figure 3] 10 is a flowchart illustrating an example of PUCCH transmission according to an embodiment of the present invention. [Figure 4] FIG. 2 is a diagram illustrating an example (1) of PUCCH transmission according to an embodiment of the present invention. [Figure 5] FIG. 10 is a diagram illustrating an example (2) of PUCCH transmission according to an embodiment of the present invention. [Figure 6] FIG. 10 is a diagram illustrating an example (3) of PUCCH transmission according to an embodiment of the present invention. [Figure 7] FIG. 10 is a diagram illustrating an example (4) of PUCCH transmission according to an embodiment of the present invention. [Figure 8] FIG. 10 is a diagram showing an example (5) of PUCCH transmission according to an embodiment of the present invention. [Figure 9] FIG. 10 is a diagram showing an example (6) of PUCCH transmission according to an embodiment of the present invention. [Figure 10] FIG. 10 is a diagram showing an example (7) of PUCCH transmission according to an embodiment of the present invention. [Figure 11] FIG. 2 is a diagram illustrating an example of MAC-CE in an embodiment of the present invention. [Figure 12] FIG. 10 is a diagram showing an example (8) of PUCCH transmission according to an embodiment of the present invention. [Figure 13] FIG. 9 is a diagram showing an example (9) of PUCCH transmission according to an embodiment of the present invention. [Figure 14] FIG. 1 is a diagram illustrating an example (1) of PUCCH carrier switching according to an embodiment of the present invention. [Figure 15]FIG. 10 is a diagram illustrating an example (2) of PUCCH carrier switching according to an embodiment of the present invention. [Figure 16] FIG. 10 is a diagram illustrating an example (3) of PUCCH carrier switching according to an embodiment of the present invention. [Figure 17] FIG. 10 is a diagram illustrating an example of disabling PUCCH carrier switching in an embodiment of the present invention. [Figure 18] FIG. 2 is a diagram illustrating an example (1) of PUCCH transmission power control according to an embodiment of the present invention. [Figure 19] FIG. 10 is a diagram illustrating an example (2) of PUCCH transmission power control according to an embodiment of the present invention. [Figure 20] FIG. 10 is a diagram illustrating an example (3) of PUCCH transmission power control according to an embodiment of the present invention. [Figure 21] FIG. 10 is a diagram illustrating an example (4) of PUCCH transmission power control according to an embodiment of the present invention. [Figure 22] FIG. 10 is a diagram illustrating an example (5) of PUCCH transmission power control according to an embodiment of the present invention. [Figure 23] 1A and 1B are diagrams illustrating examples of spatial relationships according to an embodiment of the present invention. [Figure 24] FIG. 10 is a diagram illustrating an example (6) of PUCCH transmission power control according to an embodiment of the present invention. [Figure 25] FIG. 1 is a diagram showing an example (1) of UCI multiplexing in an embodiment of the present invention. [Figure 26] FIG. 10 is a diagram showing an example (2) of UCI multiplexing in the embodiment of the present invention. [Figure 27] FIG. 10 is a diagram showing an example (3) of UCI multiplexing in the embodiment of the present invention. [Figure 28] FIG. 10 is a diagram showing an example (4) of UCI multiplexing in the embodiment of the present invention. [Figure 29] FIG. 10 is a diagram showing an example (5) of UCI multiplexing in the embodiment of the present invention. [Figure 30] FIG. 10 is a diagram illustrating an example (1) of a HARQ-ACK offset according to an embodiment of the present invention. [Figure 31]FIG. 10 is a diagram illustrating an example (2) of a HARQ-ACK offset according to an embodiment of the present invention. [Figure 32] FIG. 10 is a diagram illustrating an example (3) of a HARQ-ACK offset according to an embodiment of the present invention. [Figure 33] FIG. 10 is a diagram showing an example (4) of a HARQ-ACK offset in an embodiment of the present invention. [Figure 34] FIG. 10 is a diagram showing an example (5) of a HARQ-ACK offset in an embodiment of the present invention. [Figure 35] FIG. 10 is a diagram showing an example (6) of a HARQ-ACK offset in an embodiment of the present invention. [Figure 36] 2 is a diagram illustrating an example of a functional configuration of a base station 10 according to an embodiment of the present invention. [Figure 37] FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal 20 according to the embodiment of the present invention. [Figure 38] 2 is a diagram illustrating an example of a hardware configuration of a base station 10 or a terminal 20 according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described 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.

[0011] In operation of the wireless communication system according to the embodiment of the present invention, an existing technology may be used as appropriate, such as, but not limited to, the existing NR or LTE.

[0012] Fig. 1 is a diagram illustrating an example (1) of a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, the wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each.

[0013] 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 a wireless signal are defined in the time domain and the frequency domain, and the time domain may be defined by the number of OFDM symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. Furthermore, a TTI (Transmission Time Interval) in the time domain may be a slot, or a TTI may be a subframe.

[0014] Base station 10 is capable of performing carrier aggregation (CA) that aggregates multiple cells (multiple CCs (component carriers)) to communicate with terminal 20. In carrier aggregation, one PCell (Primary Cell) and one or more SCells (Secondary Cells) are used.

[0015] The base station 10 transmits a synchronization signal, system information, and the like to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, on the NR-PBCH or PDSCH, and is also called broadcast information. As shown in FIG. 1 , the base station 10 transmits control signals or data to the terminal 20 on the DL (Downlink) and receives control signals or data from the terminal 20 on the UL (Uplink). Note that, here, signals transmitted on control channels such as the PUCCH (Physical Uplink Shared Channel) and the PDCCH (Physical Downlink Control Channel) are called control signals, and signals transmitted on shared channels such as the PUSCH (Physical Uplink Shared Channel) and the PDSCH (Physical Downlink Shared Channel) are called data, but these names are merely examples.

[0016] 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 an M2M (Machine-to-Machine) communication module. As shown in Fig. 1, the terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. The terminal 20 may be referred to as a UE, and the base station 10 may be referred to as a gNB.

[0017] Fig. 2 is a diagram illustrating an 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 in which dual connectivity (DC) is implemented. As shown in Fig. 2, a base station 10A serving as a master node (MN) and a base station 10B serving as a secondary node (SN) are provided. The base station 10A and the base station 10B are each connected to a core network 30. A terminal 20 can communicate with both the base station 10A and the base station 10B.

[0018] A cell group provided by the base station 10A, which is an MN, is called a Master Cell Group (MCG), and a cell group provided by the base station 10B, which is an SN, is called a Secondary Cell Group (SCG). In dual connectivity, an MCG is composed of one PCell and zero or more SCells, and an SCG is composed of one PSCell (Primary SCG Cell) and zero or more SCells. A PCell or a PSCell may be referred to as an SpCell (Special Cell).

[0019] Dual connectivity may be a communication method using two communication standards, and any combination of communication standards may be used. For example, the combination may be NR and 6G standards, or LTE and 6G standards. Dual connectivity may also be a communication method using three or more communication standards, and may be called by a name other than dual connectivity.

[0020] The processing operations in this embodiment may be performed in the system configuration shown in FIG. 1, in the system configuration shown in FIG. 2, or in a system configuration other than these.

[0021] 3GPP standardization is considering supporting enhanced Internet of Things (IoT) and ultra-reliable and low latency communication (URLLC) in NR. Furthermore, enhancements to HARQ-ACK feedback are being considered to address URLLC requirements. For example, PUCCH carrier switching is being considered to improve the latency of HARQ-ACK feedback.

[0022] Here, the PUCCH resource is set to a PCell, a PSCell, or a PUCCH-SCell. A terminal cannot transmit a PUCCH from a cell other than a PCell, a PSCell, or a PUCCH-SCell. Which cell the PUCCH is to be transmitted from is specified in advance, and it is difficult to flexibly change the cell.

[0023] For example, suppose the following settings are made: PUCCH Group 1: CC0=PCell, CC1=SCell PUCCH Group 2: CC2=PUCCH-SCell, CC3=SCell

[0024] In this case, in the case of PUCCH group 1, it was possible to transmit the PUCCH only on CC0, and it was not possible to transmit the PUCCH on CC1. In the case of PUCCH group 2, it was possible to transmit the PUCCH only on CC2, and it was not possible to transmit the PUCCH on CC3. Furthermore, since the PUCCH-SCell cannot be configured in intraband CA, it was difficult to flexibly change which CC in the intraband to transmit the PUCCH on.

[0025] Therefore, the CC for transmitting the PUCCH may be flexibly selected, and it may be specified which CC is used to transmit the PUCCH. For example, PUCCH carrier switching based on dynamic notification by DCI (Downlink Control Information) that schedules the PUCCH may be supported. Also, for example, PUCCH carrier switching based on semi-static settings may be supported. PUCCH carrier switching may mean switching the carrier, CC, or cell for transmitting the PUCCH.

[0026] For example, the semi-static configuration may be based on a timing pattern of the PUCCH cell configured by RRC (Radio Resource Control), or PUCCH carrier switching between cells with different numerologies or subcarrier spacings may be supported. The PUCCH cell may be a cell capable of transmitting the PUCCH.

[0027] In addition, the maximum number of PUCCH cells may be specified. In addition, dynamic configuration and semi-static configuration may be integrated and applied to PUCCH carrier switching. In addition, PUCCH carrier switching and SPS (Semi-persistent) HARQ-ACK postponement may be integrated and applied.

[0028] 3 is a flowchart illustrating an example of PUCCH transmission in an embodiment of the present invention. In step S1, terminal 20 receives DCI and PDSCH from base station 10. In the following step S2, terminal 20 determines a PUCCH for transmitting a HARQ-ACK corresponding to the received PDSCH. Terminal 20 may determine a cell or carrier for transmitting the PUCCH, a resource for transmitting the PUCCH, and transmission power for transmitting the PUCCH, based on control information received from base station 10. This control information may be, for example, RRC, MAC-CE, and / or DCI. Hereinafter, RRC, MAC-CE, and DCI may be interchangeable. In the following step S3, terminal 20 transmits the determined PUCCH to base station 10.

[0029] For example, the base station 10 may indicate the destination CC of the PUCCH using RRC, MAC-CE (Medium Access Control - Control Element), or DCI. The terminal 20 may transmit the PUCCH on the indicated CC.

[0030] For example, PUCCH #1 transmitted on a PCell or a PSCell and PUCCH #2 transmitted on a PUCCH-SCell may be switched by RRC, MAC-CE, or DCI.

[0031] 4 is a diagram showing an example (1) of PUCCH transmission in an embodiment of the present invention. As shown in FIG. 4, switching of the CC that transmits the PUCCH is not limited to PCell, PSCell, or PUCCH-SCell, and may be instructed by RRC, MAC-CE, and / or DCI. For example, a CC that transmits the PUCCH may be instructed from all configured CCs by RRC, MAC-CE, and / or DCI. Furthermore, for example, one or more predetermined CC lists including some CCs from all configured CCs may be selected or configured in advance, and a CC that transmits the PUCCH may be instructed from CCs included in the selected or configured CC list by RRC, MAC-CE, and / or DCI.

[0032] One or more predetermined CC lists including some of the configured CCs may be selected or configured based on a predetermined rule. For example, the predetermined rule may be to select a predetermined number of CCs in ascending order of CCIDs as one list. The predetermined number may be specified by a specification, may be configured by a higher layer, or may be notified from the terminal 20 to the base station 10 by a UE capability report.

[0033] Furthermore, for example, one or more predetermined CC lists including some of the configured CCs may be configured by a higher layer. The maximum number of CCs that can be configured per CC list may be notified to the base station 10 from the terminal 20 by a UE capability report.

[0034] Regarding PUCCH carrier switching, both 1) and 2) below may be considered.

[0035] 1) When the carrier for transmitting the PUCCH is dynamically designated. 2) When the carrier for transmitting the PUCCH is instructed semi-statically, for example, when PUCCH carrier switching is performed only when the PUCCH cannot be transmitted in the slot instructed by the HARQ feedback timing indicator.

[0036] By transmitting the PUCCH as described above, resource distribution becomes possible because the degree of congestion of the resources used by the UE varies for each CC. Also, since the TDD settings may differ for each CC, PUCCH transmission timing can be more flexible.

[0037] Fig. 5 is a diagram showing an example (2) of PUCCH transmission in an embodiment of the present invention. The CC of the PUCCH that collectively transmits UCI may be indicated or selected by MAC-CE and / or DCI from predetermined CC candidates, for example, the first CC list shown in Fig. 5. By setting or defining the first CC list, it is possible to limit the CC candidates that can be indicated by MAC-CE and / or DCI, thereby reducing signaling overhead and UE complexity.

[0038] 5, a second CC list indicating which CC's UCI (e.g., HARQ, CSI, etc.) are to be transmitted collectively on the PUCCH may or may not be transmitted from base station 10 to terminal 20. If the second list is not transmitted, terminal 20 may transmit the UCI of all CCs collectively on the PUCCH. These all CCs may be all CCs including SpCell and SCell, or may be all CCs in a PUCCH cell group.

[0039] Fig. 6 is a diagram showing an example (3) of PUCCH transmission in an embodiment of the present invention. As shown in Fig. 6, the TDD setting may differ for each CC. When the slot specified as HARQ timing is DL, if there is UL in another CC in that slot, HARQ-ACK is transmitted in that other CC, which makes it possible to reduce HARQ delay compared to conventional methods and improve URLLC performance.

[0040] For example, as shown in Fig. 6, in an SpCell transmitting a PUCCH, if a slot indicated by a HARQ feedback timing indicator (PDSCH to HARQ feedback timing indicator) included in DCI is unavailable, the CC transmitting the PUCCH may be switched to SCell #1. The condition for this unavailability may be, for example, that the slot is a DL slot, that the UL symbol of the PUCCH is unavailable in a special subframe, or that the slot is an UL slot but has already been assigned to another channel.

[0041] In an embodiment of the present invention, the CC for transmitting the PUCCH can be switched by pre-setting the CC for transmitting the PUCCH by RRC or by terminal 20 searching for available CCs, even when there is no instruction for PUCCH carrier switching by MAC-CE or DCI. Furthermore, the PUCCH may be transmitted in the same slot as the slot indicated by the HARQ feedback timing indicator, or in a slot that at least partially overlaps with the slot indicated by the HARQ feedback timing indicator in the case of a different SCS. When multiple CCs are available, priorities may be specified or set in advance for the CCs. For example, a CC with a smaller CC index may be given priority for transmitting the PUCCH. Candidates for the CC for transmitting the switched PUCCH may be set in advance by a higher layer. This makes it possible to prevent the PUCCH from being transmitted on a CC that is not desired for terminal 20.

[0042] Fig. 7 is a diagram showing an example (4) of PUCCH transmission in an embodiment of the present invention. Fig. 8 is a diagram showing an example (5) of PUCCH transmission in an embodiment of the present invention. When a slot indicated by the HARQ feedback timing indicator is unavailable in a CC transmitting a PUCCH, terminal 20 may switch the CC transmitting a PUCCH. Furthermore, as shown in Fig. 7 or 8, when there is no other available CC in the same slot or in a slot that at least partially overlaps, terminal 20 may change the slot transmitting an HARQ-ACK. Fig. 7 shows an example of changing to an earlier available slot in the time domain, and Fig. 8 shows an example of changing to a later available slot in the time domain. Alternatively, terminal 20 does not need to consider the case where there is no other available CC.

[0043] Furthermore, when base station 10 instructs terminal 20 on the CC to transmit the PUCCH by RRC, MAC-CE and / or DCI, base station 10 and terminal 20 may first determine the CC to transmit the PUCCH, and then determine the slot to transmit the PUCCH. Furthermore, when base station 10 instructs terminal 20 on the CC to transmit the PUCCH by RRC, MAC-CE and / or DCI, base station 10 and terminal 20 may first determine the slot to transmit the PUCCH, and then determine the CC to transmit the PUCCH.

[0044] FIG. 9 is a diagram showing an example (6) of PUCCH transmission according to an embodiment of the present invention. As shown in FIG. 9, terminal 20 may transmit an HARQ-ACK in a slot and CC that allows the earliest PUCCH transmission after a predetermined time has elapsed after receiving a PDSCH. Note that HARQ-ACK may mean HARQ feedback, and may include an ACK, i.e., a positive response, or a NACK, i.e., a negative response. When an operation is configured by a higher layer, the UE may not require the HARQ feedback timing indicator field in some or all of DCI format 1_0, DCI format 1_1, and DCI format 1_2. The HARQ-ACK for a PDSCH scheduled with a DCI that does not include an HARQ feedback timing indicator field may be transmitted in a slot and CC that allows the earliest PUCCH transmission after a predetermined time has elapsed after receiving a PDSCH. The method shown in FIG. 9 minimizes the delay of HARQ feedback and eliminates the need for signaling such as an HARQ feedback timing indicator, thereby reducing DCI overhead.

[0045] In the example shown in Fig. 9, after receiving the PDSCH, terminal 20 transmits PUCCH on SCell #1, which is available for transmission in the nearest slot after a predetermined time has elapsed. Note that if multiple CCs are available, the priority order between the CCs may be specified or set in advance. For example, a CC with a smaller CC index may be given priority for use in PUCCH transmission. Furthermore, candidates for CCs to which PUCCH is switched may be set in advance by a higher layer. This makes it possible to prevent PUCCH from being transmitted on a CC that is not desired to be transmitted by terminal 20.

[0046] For example, base station 10 may use DCI to indicate or select the CC on which to transmit the PUCCH to terminal 20. As shown in 1)-3) below, base station 10 may use a predetermined field in DCI to indicate the CC on which to transmit the PUCCH.

[0047] 1) A new CC indication field may be defined to indicate the CC that transmits the PUCCH. For example, the new CC indication field may be defined in some or all of DCI format 1_0, DCI format 1_1, and DCI format 1_2, which are DCIs that schedule DL. Table 1 shows an example of the new CC indication field.

[0048] [Table 1]

[0049] The CC for transmitting the PUCCH is specified by the DCI code point as shown in Table 1. Table 1 shows an example in which the CC indication field is 2 bits. The CC index associated with each DCI code point may be signaled by RRC or MAC-CE.

[0050] 2) The CC that transmits the PUCCH may be indicated by an existing DCI field. For example, it may be indicated by a PRI (PUCCH resource indicator) field. Table 2 is an example of indicating the CC that transmits the PUCCH by the PRI field.

[0051] [Table 2]

[0052] A CC for transmitting the PUCCH may be associated with each PUCCH resource as shown in Table 2. A destination CC associated with each PUCCH resource may be configured by a higher layer.

[0053] 3) An existing DCI field may be used to indicate the CC on which the PUCCH is to be transmitted. For example, the carrier indicator field (CIF) may be used to indicate the CC on which the PUCCH is to be transmitted. For example, a CIF may be present when PUCCH carrier switching is configured, regardless of whether the PDSCH is cross-carrier scheduled. The base station 10 may use the CIF to indicate to the terminal 20 the CC on which the PUCCH is to be transmitted.

[0054] When cross-carrier scheduling is configured, a common CIF may be used to indicate the CC on which the PDSCH is scheduled and the CC on which the PUCCH is transmitted. Alternatively, the CIF may be used to indicate the CC on which the PDSCH is scheduled, and the CC on which the PUCCH is transmitted may be indicated by the method 1) or 2) above. Alternatively, the CIF may be extended, and a first CIF may be used to indicate the CC on which the PDSCH is scheduled, and a second CIF may be used to indicate the CC on which the PUCCH is transmitted.

[0055] 10 is a diagram showing an example (7) of PUCCH transmission in an embodiment of the present invention. When HARQ-ACKs corresponding to multiple PDSCHs triggered or scheduled by multiple DCIs are transmitted on a PUCCH, it may be configured or specified in advance which CC to use to transmit the PUSCH indicated by which DCI. For example, as shown in FIG. 10, the CC (CC0 in FIG. 10) to transmit the PUCCH may be determined based on the last DCI in the time and frequency directions.

[0056] Fig. 11 is a diagram showing an example of a MAC-CE in an embodiment of the present invention. Base station 10 may use a MAC-CE to indicate to terminal 20 the CC that will transmit the PUCCH. As shown in Fig. 11, a MAC-CE that indicates the CC that will transmit the PUCCH may be defined. Terminal 20 may transmit the PUCCH using the CC indicated by the MAC-CE. A cell that will transmit the PUCCH may be indicated by one MAC-CE per cell group, or a cell that will transmit the PUCCH may be indicated by one MAC-CE per UE.

[0057] In the example shown in FIG. 10, the MAC-CE may include a cell group index, and the bit size indicating the cell group index may be determined according to the number of cell groups. Also, when a cell that transmits a PUCCH is not indicated in units of cell groups, the cell group index may not be included in the MAC-CE. For example, in the example shown in FIG. 10, one cell that transmits a PUCCH from a maximum of eight cells is indicated. The terminal 20 n = 1 may transmit the PUCCH. In addition, in the MAC-CE, the cell may be notified by a cell index instead of a bitmap. For example, when notifying one cell that transmits a PUCCH from eight cells, the corresponding bit width in the MAC-CE may be configured as 3 bits.

[0058] Fig. 12 is a diagram showing an example (8) of PUCCH transmission in an embodiment of the present invention. When performing PUCCH carrier switching, terminal 20 may use the PUCCH resource of the CC that transmits the PUCCH indicated by MAC-CE and / or DCI, as shown in Fig. 12. For example, terminal 20 may use the PUCCH resource of the scheduled cell that is indicated by information indicating the PRI or the CC that transmits the PUCCH.

[0059] Fig. 13 is a diagram showing an example (9) of PUCCH transmission in an embodiment of the present invention. When performing PUCCH carrier switching, terminal 20 may use a PUCCH resource set in a CC that has received DCI indicating information indicating the CC that transmits PRI or PUCCH, as shown in Fig. 13. For example, terminal 20 may use a PUCCH resource of a scheduling cell that indicates information indicating the CC that transmits PRI or PUCCH. Furthermore, when transmitting PUCCH scheduled from multiple CCs as shown in Fig. 13, terminal 20 may use a PUCCH resource set in a CC that has received the last DCI in the time and frequency directions.

[0060] Furthermore, when performing PUCCH carrier switching, terminal 20 may use PUCCH resources allocated to the CC that has received the PDSCH scheduled by the last DCI.

[0061] Note that PUCCH-config may be set for each BWP (Bandwidth Part). The above-mentioned "CC" may be replaced with "BWP within CC". Note that the embodiment of the present invention may operate when PUCCH carrier switching is set. Also, "PUCCH carrier switching" may be read as "instructing the CC to transmit PUCCH by RRC, MAC-CE and / or DCI". Note that slot and subslot may be read interchangeably. Note that SUL (Supplementary Uplink) may or may not be included in the CCs targeted for PUCCH carrier switching. Whether or not SUL is included in the CCs targeted for PUCCH carrier switching may be reported from terminal 20 to base station 10 by a UE capability report.

[0062] The embodiment of the present invention may be limited to application to terminals 20 that have reported the UE capabilities shown in 1) and / or 2) below.

[0063] 1) UE capability indicating whether PUCCH carrier switching is supported. For example, it may be a UE capability indicating whether a CC for transmitting PUCCH is indicated by RRC, MAC-CE, and / or DCI. It may also be a UE capability indicating whether a CC for transmitting PUCCH is indicated by MAC-CE. It may also be a UE capability indicating whether a CC for transmitting PUCCH is indicated by DCI.

[0064] 2) The number of CCs to be switched to in PUCCH carrier switching. This may be the maximum number of CCs that can be set per CC list to be switched to in PUCCH carrier switching.

[0065] Furthermore, as UE capabilities, the CC to which PUCCH carrier switching is switched may be set as one or more of the following NR carrier types. For example, terminal 20 may report carrier types that can transmit PUCCH, and the PUCCH carrier may be switched only to those carrier types.

[0066] The one or more NR carrier types may be {FR1 licensed TDD (fr1-NonSharedTDD-r16), FR1 unlicensed TDD (fr1-SharedTDD-r16), FR1 licensed FDD (fr1-NonSharedFDD-r16), FR2 (fr2-r16)}.

[0067] Furthermore, the one or more NR carrier types may be {FR1-NonSharedTDD, FR1-SharedTDD, FR1-NonSharedFDD, FR2}.

[0068] The activation timing of the instruction of the CC that transmits the PUCCH may be specified. For example, the activation timing may be specified as the time from when the CC that transmits the PUCCH is instructed by RRC, MAC-CE, and / or DCI until when the PUCCH carrier switching is actually applied.

[0069] The base station 10 and the terminal 20 need to have a common understanding of the CC that transmits the PUCCH. By specifying the application timing of the instruction of the CC that transmits the PUCCH, for example, if the terminal 20 fails to receive the instruction, the base station 10 can recognize that the instruction is not valid.

[0070] Note that PUCCH carrier switching may be in a valid or invalid state. An instruction of a CC to transmit a PUCCH may be called an activation command, and an activation command for validating the instruction may be defined separately from the instruction. Also, a deactivation command for invalidating the instruction may be defined.

[0071] Fig. 14 is a diagram showing an example (1) of PUCCH carrier switching in an embodiment of the present invention. As shown in Fig. 14, the assumed CC for transmitting the PUCCH may be switched after a predetermined time has elapsed since an ACK is transmitted to the MAC-CE indicating the CC for transmitting the PUCCH. The predetermined time may be, for example, 3 ms later, or until the start of the next slot after 3 ms has elapsed. Note that indicating by the MAC-CE may mean indicating the CC for transmitting the PUCCH only by the MAC-CE, or may mean indicating a CC list including multiple CCs by the MAC-CE and indicating one CC by the DCI.

[0072] 15 is a diagram showing an example (2) of PUCCH carrier switching according to an embodiment of the present invention. As shown in FIG. 15, the assumed CC for transmitting the PUCCH may be switched before transmitting the PUCCH / PUSCH for transmitting an ACK / NACK in response to DCI indicating the CC for transmitting the PUCCH.

[0073] Fig. 16 is a diagram showing an example (3) of PUCCH carrier switching in an embodiment of the present invention. As shown in Fig. 16, the assumed CC for transmitting the PUCCH may be switched after a predetermined time has elapsed since an ACK in response to a DCI instructing the CC for transmitting the PUCCH is transmitted. The predetermined time may be, for example, 3 ms later, or until the start of the next slot after 3 ms has elapsed.

[0074] Furthermore, deactivation timing may be specified. Regarding a CC that transmits a PUCCH that was previously enabled, the CC that transmits the PUCCH that was previously enabled may be deactivated when the CC that transmits the PUCCH next becomes enabled.

[0075] Fig. 17 is a diagram showing an example of disabling PUCCH carrier switching in an embodiment of the present invention. A disabling command is defined, and PUCCH carrier switching may be disabled in terminal 20 that receives the disabling command. The disabling command may be notified by MAC-CE or indicated by DCI. Disabling may occur after a predetermined time or period has elapsed after receiving an activation command or after indicating a CC to transmit PUCCH by MAC-CE and / or DCI. As shown in Fig. 17, during the disabling period, fallback may be performed to an operation of transmitting PUCCH on PCell, PSCell, or PUCCH-SCell.

[0076] 14 indicates invalidation of the CC that transmits the PUCCH, the assumption of the CC that transmits the PUCCH may be changed after a predetermined time has elapsed since an ACK for the MAC-CE is transmitted. The predetermined time may be, for example, 3 ms later, or until the start of the next slot after 3 ms has elapsed.

[0077] In addition, if the instruction of the CC that transmits the PUCCH shown in Figure 15 is a DCI indicating invalidation, the assumption of the CC that transmits the PUCCH may be switched before transmitting the PUCCH / PUSCH that transmits the ACK / NACK for the DCI.

[0078] 16 indicates a DCI indicating invalidation, the assumption of the CC transmitting the PUCCH may be changed after a predetermined time has elapsed since an ACK for the DCI was transmitted. The predetermined time may be, for example, 3 ms later, or until the start of the next slot after 3 ms has elapsed.

[0079] PUCCH power control is configured by pucch-PowerControl included in PUCCH-Config, which is an RRC information element, and PUCCH spatial relation included in PUCCH resource. Multiple sets of P0, α, and path loss RS may be configured in pucch-PowerControl, and an ID indicating one of the sets may be indicated in PUCCH spatial relation.

[0080] When PUCCH carrier switching is configured, the PUCCH transmission power may be determined using parameters for PUCCH power control configured in the CC (or BWP) that transmits the PUCCH. The parameters may be pucch-PowerControl included in PUCCH-Config and PUCCH spatial relation included in the PUCCH resource.

[0081] Regarding open loop power control (OL-PC) and closed loop power control (CL-PC) in PUCCH carrier switching, both 1) and 2) shown below may be considered.

[0082] 1) When the carrier for transmitting the PUCCH is dynamically indicated. 2) When the carrier for transmitting the PUCCH is semi-statically indicated, for example, when PUCCH carrier switching is performed only when the PUCCH cannot be transmitted in the slot for transmitting the PUCCH indicated by the HARQ feedback timing indicator.

[0083] Figure 18 is a diagram showing an example (1) of PUCCH transmission power control in an embodiment of the present invention. When performing PUCCH carrier switching, terminal 20 may use the PUCCH power control parameters of a CC that transmits the PUCCH indicated by MAC-CE and / or DCI, as shown in Figure 18. For example, terminal 20 may use the PUCCH power control parameters of a scheduled cell that is indicated by information indicating the PRI or the CC that transmits the PUCCH.

[0084] Fig. 19 is a diagram showing an example (2) of PUCCH transmission power control in an embodiment of the present invention. When performing PUCCH carrier switching, terminal 20 may use PUCCH power control parameters that are set for a CC that has received DCI indicating information indicating the CC that transmits PRI or PUCCH, as shown in Fig. 19. For example, terminal 20 may use PUCCH power control parameters of a scheduling cell that indicates information indicating the CC that transmits PRI or PUCCH. Furthermore, when transmitting PUCCH scheduled from multiple CCs as shown in Fig. 19, terminal 20 may use PUCCH power control parameters that are set for a CC that has received the last DCI in the time and frequency directions (last DCI).

[0085] Furthermore, when performing PUCCH carrier switching, terminal 20 may use the PUCCH power control parameters assigned to the CC that received the PDSCH scheduled by the last DCI.

[0086] Fig. 20 is a diagram showing an example (3) of PUCCH transmission power control in an embodiment of the present invention. As shown in Fig. 20, when PUCCH carrier switching is executed or instructed, terminal 20 may reset the accumulated TPC (Transmission Power Control) command value or set the value to 0. For example, the accumulated TPC command value of the PUCCH in CC0 may be a different value from the accumulated TPC command value of the PUCCH in CC1 because the frequencies and propagation paths are different.

[0087] 21 is a diagram showing an example (4) of PUCCH transmission power control according to an embodiment of the present invention. As shown in FIG. 21, terminal 20 may accumulate the TPC command cumulative value before and after PUCCH carrier switching is performed or instructed.

[0088] Fig. 22 is a diagram showing an example (5) of PUCCH transmission power control in an embodiment of the present invention. As shown in Fig. 22, an accumulated value of CL-PC may be held for each CC. For example, when a TPC command is instructed for a PUCCH resource of CC0, it may be held as an accumulated value of TPC commands for the PUCCH of CC0, and when a TPC command is instructed for a PUCCH resource of CC1, it may be held as an accumulated value of TPC commands for the PUCCH of CC1. In the example shown in Fig. 22, the PUCCH of CC1 is not transmitted. Thereafter, when CC1 is instructed as the CC to transmit the PUCCH, the PUCCH may be transmitted using the accumulated value of TPC commands accumulated in CC1.

[0089] Fig. 23 is a diagram showing an example of spatial relationships in an embodiment of the present invention. As shown in Fig. 23, when transmitting to one base station 10, the path loss differs if the beam, i.e., the spatial relationship, differs. Also, when transmitting to two base stations 10, the path loss differs. Therefore, terminal 20 can hold two accumulated values ​​of CL-PC.

[0090] One spatial relationship is set for each PUCCH resource. Furthermore, closedLoopIndex={i0, i1} is signaled. The PUCCH resource for which i0 is signaled and the PUCCH resource for which i1 is signaled independently hold the accumulated TPC command values ​​of CL-PC.

[0091] 24 is a diagram showing an example (6) of PUCCH transmission power control according to an embodiment of the present invention. Since the PUCCH closedLoopIndex is set in the PUCCH spatialRelation of each PUCCH resource, in the PUCCH resource determined according to the above-described embodiment of the present invention, it is possible to use the PUCCH closedLoopIndex={i0, i1} set in the PUCCH spatialRelation set in the determined PUCCH resource.

[0092] For example, as shown in FIG. 24, when different PUCCH closedLoopIndexes are set between PUCCH resources before and after PUCCH carrier switching, it may be considered that the PUCCH closedLoopIndex is switched in conjunction with the PUCCH carrier switching.

[0093] Note that closedLoopIndex and the like are examples of TPC parameters, and other RRC parameters applied to PUCCH power control, such as P0, the value of α, PL-RS, and the like, may also be set in terminal 20 using a mechanism similar to that of closedLoopIndex. For example, when a PUCCH resource is switched due to PUCCH carrier switching, a TPC parameter linked to the PUCCH resource of the switching destination may be applied using the same mechanism.

[0094] Fig. 25 is a diagram showing an example (1) of UCI multiplexing in an embodiment of the present invention. As shown in Fig. 25, when the HARQ feedback timing indicator field indicates that multiple UCIs are to be transmitted in the same slot or sub-slot, the multiple UCIs may be multiplexed and transmitted in the same PUCCH resource. Hereinafter, "slot" may be replaced with "sub-slot".

[0095] Hereinafter, a case will be described in which PUCCH carrier switching is dynamically performed in consideration of the numerology or subcarrier spacing (SCS) of the CC that transmits the PUCCH.

[0096] Figure 26 is a diagram showing an example (2) of UCI multiplexing in an embodiment of the present invention. As shown in Figure 26, when the SCSs of CC0 and CC1 are different and the SCS of the CC that transmits PUCCH is smaller, the two UCIs are not transmitted in the same slot. HARQ-ACK transmission is indicated in slot #n in CC0, and HARQ-ACK transmission is indicated in slot #m in CC1. In the case shown in Figure 26, PUCCH may be transmitted in slot #n of CC0.

[0097] Figure 27 is a diagram showing an example (3) of UCI multiplexing in an embodiment of the present invention. As shown in Figure 27, when the SCSs of CC0 and CC1 are different and the SCS of the CC that transmits PUCCH is smaller, the two UCIs are not transmitted in the same slot. HARQ-ACK transmission is indicated in slot #n in CC0, and HARQ-ACK transmission is indicated in slot #m+1 in CC1. In the case shown in Figure 27, PUCCH may be transmitted in slot #n of CC0.

[0098] Figure 28 is a diagram showing an example (4) of UCI multiplexing in an embodiment of the present invention. As shown in Figure 28, when the SCSs of CC0 and CC1 are different and the SCS of the CC that transmits PUCCH is larger, the two UCIs are not transmitted in the same slot. HARQ-ACK transmission is indicated in slot #n in CC0, and HARQ-ACK transmission is indicated in slot #m in CC1. In the case shown in Figure 28, PUCCH may be transmitted in slot #m in CC1.

[0099] Figure 29 is a diagram showing an example (5) of UCI multiplexing in an embodiment of the present invention. As shown in Figure 29, when the SCSs of CC0 and CC1 are different and the SCS of the CC that transmits PUCCH is larger, the two UCIs are not transmitted in the same slot. HARQ-ACK transmission is indicated in slot #n in CC0, and HARQ-ACK transmission is indicated in slot #m+1 in CC1. In the case shown in Figure 29, PUCCH may be transmitted in slot #m+1 in CC1.

[0100] The conditions under which UCIs are multiplexed in the same PUCCH resource may be the conditions shown in 1) to 3) below.

[0101] 1) When at least a portion of the slots or subslots of the PUCCH at the time when each CC is specified overlaps. When at least a portion of the slots or subslots of the PUCCH resources overlap in the CC of the PUCCH at the time when the CC is specified, the UCI may be multiplexed. It is assumed that the CC of the PUCCH at the time when the PUCCH resources were specified in the past and the CC that actually transmits the PUCCH may differ when PUCCH carrier switching occurs. However, the terminal 20 may use the SCS and slot or subslot of the CC of the PUCCH at the time when the PUCCH resources were specified or triggered to determine the conditions for multiplexing UCI on the same PUCCH resource and to determine the transmission timing of the UCI.

[0102] 2) When at least a portion of the slot or sub-slot of the PUCCH at the time of actual transmission overlaps: After the CC that transmits the PUCCH is specified and the CC that transmits the PUCCH is determined, i.e., after PUCCH carrier switching is performed, if at least a portion of the slot or sub-slot of the CC that transmits the PUCCH overlaps, UCI may be multiplexed. If there is no overlap with the slot or sub-slot of the CC that transmits the PUCCH, UCI may be transmitted without being multiplexed.

[0103] 3) When the slot or sub-slot index values ​​of the HARQ feedback timing indicator of the PUCCH resource indicated by each CC are the same.

[0104] In the above, whether or not to multiplex PUCCHs is determined based on whether or not PUCCH slots or subslots overlap, but terminal 20 may also determine whether or not to multiplex PUCCHs based on whether or not PUCCH resources overlap by at least one symbol in the time domain.

[0105] 30 is a diagram showing an example (1) of a HARQ-ACK offset in an embodiment of the present invention. The timing of transmitting the HARQ-ACK is notified by offset k of the PDSCH reception slot. The UCI of each CC is transmitted on either the PCell, PSCell, or PUCCH-SCell, and it may be determined in advance which CC's UCI is transmitted on which CC's PUCCH. In other words, the CC that transmits the PUCCH does not need to be updated by RRC, MAC-CE, or DCI.

[0106] As shown in Fig. 30, the slot of a CC that transmits the same PUCCH as the receiving slot of a PDSCH or the slot of a CC that transmits an overlapping PUCCH corresponds to k = 0, and the slot of a CC that transmits a PUCCH may be counted until k = K1. For example, if a PUCCH-SCell is not configured and PUCCH carrier switching is not performed, the k value may be counted in the slot of an SpCell that is the same as the receiving slot of a PDSCH.

[0107] For example, when PUCCH-SCell is not configured, UCI for all CCs is transmitted on the PUCCH of the SpCell, so the timing for transmitting HARQ-ACK for all CCs may indicate the offset of the slot or sub-slot of HARQ-ACK in the SpCell, i.e., the CC that transmits the PUCCH.

[0108] For example, the timing of HARQ-ACK of the PDSCH of the PCell scheduled by DCI of the PCell may be indicated by a slot or sub-slot offset of the HARQ-ACK on the PCell.Furthermore, the timing of HARQ-ACK of the PDSCH of the SCell scheduled by DCI of the SCell may be indicated by a slot or sub-slot offset of the HARQ-ACK on the PCell.

[0109] In PUCCH carrier switching, the CC for transmitting the PUCCH may be updated by RRC, MAC-CE, and / or DCI. Regarding the method of counting and indicating the timing for transmitting the HARQ-ACK, as shown in 1)-4) below, the method of indicating the timing for transmitting the HARQ-ACK as a slot or sub-slot in which CC.

[0110] 1) Assuming that the UCI of each CC is transmitted on a PUCCH in either a PCell, a PSCell, or a PUCCH-SCell, a slot or a subslot may be indicated in the HARQ feedback timing indicator field. For example, when the HARQ feedback timing indicator field indicates a slot or subslot offset, the offset value may be determined without taking PUCCH carrier switching into consideration.

[0111] 31 is a diagram showing an example (2) of the HARQ-ACK offset in the embodiment of the present invention. For example, when the PUCCH-SCell is not configured, as shown in FIG. 31, the offset of the slot or sub-slot for transmitting the HARQ-ACK may be indicated on the assumption that the PUCCH is transmitted on the PCell or PSCell, i.e., the SpCell, in each CC.

[0112] In the example shown in Fig. 31, the PUCCH is transmitted in the slot m=0 in an SCell with a different SCS, but the PUCCH may also be transmitted in the slot m=1. Whether m=0 or m=1 may be specified by specifications or may be instructed by a higher layer. When terminal 20 identifies a slot for the PUCCH to be transmitted from a CC with a larger SCS to a CC with a smaller SCS, it may transmit the PUCCH in a slot with a narrower SCS that overlaps at least partially with the slot of the larger SCS. Hereinafter, when the SCS differs between CCs, slots may be identified in a similar manner.

[0113] Furthermore, for example, when a PUCCH-SCell is configured, for HARQ-ACK of a PCell or a PSCell, a slot or subslot for transmitting the HARQ-ACK may be indicated assuming that PUCCH is transmitted on the PCell or the PSCell. For HARQ-ACK of a CC other than the PCell and the PSCell, a slot or subslot for transmitting the HARQ-ACK may be indicated assuming that PUCCH is transmitted on the PUCCH-SCell.

[0114] 2) Fig. 32 is a diagram showing an example (3) of a HARQ-ACK offset in an embodiment of the present invention. As shown in Fig. 32, a slot or subslot for transmitting a HARQ-ACK may be indicated assuming a PUCCH destination CC. The PUCCH destination CC may be determined by a PUCCH switching method in an embodiment of the present invention. Furthermore, a slot or subslot for transmitting a HARQ-ACK may be indicated assuming a PUCCH destination CC at any one of the following points: the time of receiving a DCI that triggered a UCI, the time of receiving a PDSCH, and the time of transmitting a PUCCH. The point of time may be specified in a specification, may be set by a higher layer, or may be the point of time indicated in a UE capability report.

[0115] 3) Fig. 33 is a diagram showing an example (4) of HARQ-ACK offset in an embodiment of the present invention. As shown in Fig. 33, the UCI of each CC may indicate the slot or sub-slot in which the HARQ-ACK is transmitted, assuming that the CC has received the PDSCH.

[0116] 4) The slot or sub-slot in which to transmit the HARQ-ACK may be indicated, assuming the CC that received the DCI that triggered the UCI.

[0117] Figure 34 is a diagram showing an example (5) of a HARQ-ACK offset in an embodiment of the present invention. As shown in Figure 34, the timing to transmit the HARQ-ACK may be determined assuming a CC that transmits a PUCCH that was to be transmitted at the time of receiving DCI or PDSCH, and the PUCCH may be transmitted in a slot or subslot that overlaps with this timing. Figure 34 shows an example of the timing to transmit the HARQ-ACK when the CC that transmits the PUCCH is updated from SCell #2 to SpCell. The k value is counted in slots in SCell #2.

[0118] Figure 35 is a diagram showing an example (6) of a HARQ-ACK offset in an embodiment of the present invention. As shown in Figure 35, the timing of transmitting the HARQ-ACK may be determined assuming a CC that actually transmits the PUCCH, and the PUCCH may be transmitted in a slot or subslot that overlaps with this timing. Figure 35 shows an example of the timing of transmitting the HARQ-ACK when the CC that transmits the PUCCH is updated from SCell#2 to SpCell. The k value is counted in slots in the SpCell.

[0119] Here, conventionally, it was possible to configure the PUCCH-Config only for the SpCell and the PUCCH-SCell. Therefore, the configuration of either the SpCell or the PUCCH-SCell may be applied to the cell to which PUCCH carrier switching is to be transferred.

[0120] Furthermore, the PUCCH-Config may be configured for an SCell other than the SpCell and the PUCCH-SCell, limited to terminals 20 configured with PUCCH carrier switching (a CC for transmitting the PUCCH is instructed by RRC, MAC-CE, and / or DCI). However, the PUCCH-Config may be limited to SCells corresponding to CCs included in a CC list that is a transition destination of PUCCH carrier switching configured in a higher layer.

[0121] In addition, if PUCCH carrier switching (instruction of the CC that transmits the PUCCH by RRC, MAC-CE and / or DCI) is not configured, the PUCCH-Config may be configured on up to one additional SCell, or on up to one serving cell per FR.

[0122] The above-described embodiment allows terminal 20 to flexibly set the carrier to which PUCCH carrier switching is to be performed. It also clarifies PUCCH transmission power control when PUCCH carrier switching is performed. It also clarifies the timing of transmitting HARQ-ACK when PUCCH carrier switching is performed, even if the SCS is different.

[0123] That is, in the wireless communication system, it is possible to clarify the settings relating to the transmission of the uplink control channel.

[0124] (Device configuration) Next, a description will be given of an example of the functional configuration of the base station 10 and the terminal 20 that execute the processes and operations described above. The base station 10 and the terminal 20 include functions for executing the above-described embodiments. However, the base station 10 and the terminal 20 may each include only the functions proposed in any of the embodiments.

[0125] <Base station 10> Fig. 36 is a diagram showing an example of the functional configuration of the base station 10. As shown in Fig. 36, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 36 is merely an example. The names of the functional divisions and functional units may be any as long as they can perform the operations related to the embodiment of the present invention. The transmitting unit 110 and the receiving unit 120 may be called a communication unit.

[0126] The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiver 120 has a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of a higher layer from the received signal. The transmitter 110 also has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20. The transmitter 110 also transmits the setting information, etc., described in the embodiments.

[0127] 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 out the information from the storage device as needed. The control unit 140 performs, for example, overall control of the base station 10, including control related to signal transmission and reception. Note that the functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120. Furthermore, the transmitting unit 110 and the receiving unit 120 may be called a transmitter and a receiver, respectively.

[0128] <Terminal 20> Fig. 37 is a diagram showing an example of the functional configuration of the terminal 20. As shown in Fig. 37, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 37 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations related to the embodiment of the present invention. The transmitting unit 210 and the receiving unit 220 may be called a communication unit.

[0129] The transmitter 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiver 220 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals. The transmitter 210 also transmits HARQ-ACK, and the receiver 220 receives the setting information and the like described in the embodiments.

[0130] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 in a storage device, and reads it out from the storage device as needed. The setting unit 230 also stores setting information that is set in advance. The control unit 240 performs overall control of the terminal 20, including control related to signal transmission and reception. Note that the functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and the functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220. The transmitting unit 210 and the receiving unit 220 may also be called a transmitter and a receiver, respectively.

[0131] (Hardware configuration) The block diagrams (FIGS. 36 and 37) used to explain the above embodiments show functional blocks. 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 a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, by wire, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining the single device or the multiple devices with software.

[0132] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocation, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0133] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 38 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 the terminal 20 described above may be 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.

[0134] In the following description, the term "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 the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0135] Each function in the base station 10 and the terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0136] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0137] Furthermore, 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 into the storage device 1002, and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 36 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 37 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0138] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0139] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0140] 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, or a communication module. The communication device 1004 may be configured to include 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). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0141] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives 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 be integrated into one device (for example, a touch panel).

[0142] Furthermore, 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 between each device.

[0143] Furthermore, base station 10 and 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), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

[0144] (Summary of the embodiment) As described above, according to an embodiment of the present invention, there is provided a terminal having a receiving unit that receives control information and data from a base station, a control unit that determines a carrier for transmitting an uplink control channel based on the control information, and a transmitting unit that transmits information related to retransmission control of the data on the determined carrier to the base station via the uplink control channel, wherein the control unit sets the timing at which the determined carrier is enabled and disabled.

[0145] The above configuration makes it possible to clarify the timing at which PUCCH carrier switching is performed in terminal 20. That is, it is possible to clarify the settings related to the transmission of uplink control channels in a wireless communication system.

[0146] The control unit may set the timing of the activation or the timing of the deactivation based on the timing at which the transmission unit transmits a response to the control information to the base station. With this configuration, it is possible to clarify the timing at which PUCCH carrier switching is performed in terminal 20.

[0147] The transmitter may transmit information related to retransmission control of the data to the base station via the uplink control channel, using power control parameters applied to the carrier specified by the control information. With this configuration, PUCCH transmission power control can be clarified in terminal 20 when PUCCH carrier switching is performed.

[0148] When the control information indicates a transmission carrier for the uplink control channel, the control unit may reset an accumulated value of TPC (Transmission Power Control) commands applied to the uplink control channel. With this configuration, it is possible to clarify PUCCH transmission power control when PUCCH carrier switching is performed in terminal 20.

[0149] When the control information indicates a transmission carrier for the uplink control channel, the control unit may switch a closed-loop power control parameter related to a spatial relationship to be applied to the uplink control channel. With this configuration, it is possible to clarify PUCCH transmission power control when PUCCH carrier switching is performed in terminal 20.

[0150] Furthermore, according to an embodiment of the present invention, a communication method is provided in which a terminal executes a receiving procedure for receiving control information and data from a base station, a control procedure for determining a carrier for transmitting an uplink control channel based on the control information, a transmitting procedure for transmitting information related to retransmission control of the data on the determined carrier to the base station via the uplink control channel, and a procedure for setting the timing for enabling and disabling the determined carrier. is provided.

[0151] The above configuration makes it possible to clarify the timing at which PUCCH carrier switching is performed in terminal 20. That is, it is possible to clarify the settings related to the transmission of uplink control channels in a wireless communication system.

[0152] (Supplementary explanation of 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, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; two or more items may be combined as needed, and items described in one item may apply to items described in another item (unless inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of the processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station 10 and terminal 20 have been described using functional block diagrams. However, such devices may be implemented using hardware, software, or a combination thereof. The software operated by the processor of the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor of the terminal 20 in accordance with an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

[0153] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination thereof. Furthermore, 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, or the like.

[0154] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), 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), or other appropriate systems, and next-generation systems extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

[0155] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0156] In this specification, a specific operation that is described as being performed by the base station 10 may also be performed by its upper node in some cases. 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 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0157] The information or signals described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0158] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0159] In the present disclosure, the determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0160] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0161] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0162] 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. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0163] 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 a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0164] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0165] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0166] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0167] In this disclosure, terms such as "base station (BS)," "radio base station," "base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0168] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service 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 entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0169] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0170] A mobile station may also be referred to 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 suitable terminology.

[0171] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, or the mobile body itself. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include 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.

[0172] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0173] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station may be configured to have the functions of the user terminal described above.

[0174] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0175] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may 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 "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0176] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0177] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0178] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0179] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0180] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0181] 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. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0182] Numerology may be communication parameters that apply to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0183] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0184] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0185] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0186] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0187] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0188] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0189] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0190] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0191] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0192] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0193] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0194] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0195] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0196] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0197] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be set for the terminal 20 within one carrier.

[0198] At least one of the configured BWPs may be active, and the terminal 20 may not expect to transmit or receive a predetermined signal / channel outside the active BWP. Note that the terms "cell," "carrier," and the like in this disclosure may be read as "BWP."

[0199] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. 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 subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0200] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0201] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0202] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0203] 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 herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

[0204] <Additional Notes> The above-described embodiment can be further described as follows.

[0205] (Appendix 1) a receiving unit for receiving control information and data from a base station; a control unit that determines a carrier for transmitting an uplink control channel based on the control information; a transmitter that transmits information related to retransmission control of the data in the determined carrier to the base station via the uplink control channel; The control unit is a terminal that sets a timing at which the determined carrier is enabled and a timing at which the determined carrier is disabled.

[0206] (Appendix 2) 2. The terminal according to claim 1, wherein the control unit sets the timing of activation or the timing of deactivation based on the timing at which the transmission unit transmits a response to the control information to the base station.

[0207] (Appendix 3) The terminal according to claim 1, wherein the transmitting unit transmits information related to retransmission control of the data to the base station via the uplink control channel using power control parameters applied to the carrier indicated by the control information.

[0208] (Appendix 4) 2. The terminal according to claim 1, wherein the control unit resets a cumulative value of TPC (Transmission Power Control) commands applied to the uplink control channel when a transmission carrier for the uplink control channel is indicated by the control information.

[0209] (Appendix 5) The terminal according to claim 1, wherein the control unit switches closed-loop power control parameters relating to a spatial relationship to be applied to the uplink control channel when the control information indicates a transmission carrier for the uplink control channel.

[0210] (Appendix 6) a receiving procedure for receiving control information and data from a base station; a control procedure for determining a carrier for transmitting an uplink control channel based on the control information; a transmission procedure of transmitting information related to retransmission control of the data in the determined carrier to the base station via the uplink control channel; and a procedure for setting a timing at which the determined carrier is enabled and a timing at which the determined carrier is disabled. [Explanation of symbols]

[0211] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 terminals 210 Transmitter 220 Receiving unit 230 Setting Section 240 Control Unit 30 Core Network 1001 processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication equipment 1005 Input Device 1006 Output Device

Claims

1. a receiving unit that receives, from a base station, RRC (Radio Resource Control) signaling and PDSCH (Physical Downlink Shared Channel), specifying a cell that is different from a primary cell as a destination cell of a PUCCH (Physical Uplink Control Channel), and that has a subcarrier spacing that is different from the subcarrier spacing of the primary cell; a control unit that determines a cell different from the primary cell as a destination cell of the PUCCH based on the RRC signaling; a transmitter that transmits information related to retransmission control corresponding to the PDSCH to the base station in a destination cell of the PUCCH, The control unit is a terminal that holds an accumulated value of closed-loop power control for each cell in transmission power control in a cell to which the PUCCH is transmitted.

2. The terminal according to claim 1 , wherein the transmitter transmits, to the base station, a terminal capability indicating whether or not the terminal supports PUCCH cell switching by the RRC signaling.

3. A communication system having a terminal and a base station, The terminal a receiving unit that receives, from the base station, RRC (Radio Resource Control) signaling and PDSCH (Physical Downlink Shared Channel), specifying a cell that is different from a primary cell as a destination cell of a PUCCH (Physical Uplink Control Channel), and that has a subcarrier spacing that is different from the subcarrier spacing of the primary cell; a control unit that determines a cell different from the primary cell as a destination cell of the PUCCH based on the RRC signaling; a transmitter that transmits information related to retransmission control corresponding to the PDSCH to the base station in a destination cell of the PUCCH, The control unit holds an accumulated value of closed-loop power control for each cell in transmission power control in a cell to which the PUCCH is transmitted, The base station a transmitter that transmits the RRC signaling and the PDSCH to the terminal; A communication system having a control unit that assumes a cell other than the primary cell as a destination cell for the PUCCH based on the RRC signaling.

4. receiving, from a base station, RRC (Radio Resource Control) signaling and PDSCH (Physical Downlink Shared Channel), which specify a cell that is different from a primary cell as a destination cell of a PUCCH (Physical Uplink Control Channel), and which has a subcarrier spacing that is different from that of the primary cell; A procedure for determining a cell different from the primary cell as a destination cell of the PUCCH based on the RRC signaling; a step of transmitting information related to retransmission control corresponding to the PDSCH to the base station in a destination cell of the PUCCH; and a procedure for storing an accumulated value of closed-loop power control for each cell in transmission power control in the cell to which the PUCCH is transmitted.

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