Terminals, communication systems, and communication methods

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, a communication system, and a communication method in a wireless communication system.

Background Art

[0002] In 3GPP (3rd Generation Partnership Project), in order to achieve further increase in system capacity, further increase in data transmission rate, and further reduction in latency in radio sections, studies are underway on a radio communication system called 5G or NR (New Radio) (hereinafter, this radio communication system is referred to as "NR"). In 5G, various radio technologies and network architectures are being studied to satisfy the requirement of reducing the latency of a radio section to 1 ms or less while achieving a throughput of 10 Gbps or more (see, for example, Non-Patent Document 1).

[0003] Furthermore, in 3GPP standardization, PUCCH (Physical Uplink Control Channel) carrier switching has been studied for the expansion of URLLC (Ultra-Reliable and Low Latency Communications) technology. For example, PUCCH carrier switching is studied as a method for reducing latency of HARQ-ACK (Hybrid Automatic Repeat Request Acknowledgement) feedback in a TDD (Time Division Duplex) scheme (see, for example, Non-Patent Document 2).

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Non-Patent Document 2

[0005] When a cell transmitting PUCCH is expanded to a primary cell, a primary-secondary cell group cell, or a secondary cell other than a PUCCH secondary cell, the settings related to PUCCH transmission in the destination carrier were not clear when performing PUCCH carrier switching.

[0006] This invention has been made in view of the above points, and aims to clarify the settings related to the transmission of the uplink control channel in a wireless communication system. [Means for solving the problem]

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

[0008] According to the disclosed technology, the settings related to the transmission of the uplink control channel can be clarified in a wireless communication system. [Brief explanation of the drawing]

[0009] [Figure 1] This figure illustrates an example (1) of a wireless communication system in an embodiment of the present invention. [Figure 2] This figure illustrates an example (2) of a wireless communication system in an embodiment of the present invention. [Figure 3] This is a flowchart illustrating an example of PUCCH transmission in an embodiment of the present invention. [Figure 4] This figure shows an example (1) of PUCCH transmission in an embodiment of the present invention. [Figure 5] This figure shows an example (2) of PUCCH transmission in an embodiment of the present invention. [Figure 6] This figure shows an example (3) of PUCCH transmission in an embodiment of the present invention. [Figure 7] This figure shows an example (4) of PUCCH transmission in an embodiment of the present invention. [Figure 8] This figure shows an example (5) of PUCCH transmission in an embodiment of the present invention. [Figure 9] This figure shows an example (6) of PUCCH transmission in an embodiment of the present invention. [Figure 10] This figure shows an example (7) of PUCCH transmission in an embodiment of the present invention. [Figure 11] This figure shows an example of MAC-CE in an embodiment of the present invention. [Figure 12] This figure shows an example (8) of PUCCH transmission in an embodiment of the present invention. [Figure 13] This figure shows an example (9) of PUCCH transmission in an embodiment of the present invention. [Figure 14] This figure shows an example (1) of PUCCH carrier switching in an embodiment of the present invention. [Figure 15]FIG. 2 is a diagram illustrating an example (2) of PUCCH carrier switching in an embodiment of the present invention. [Figure 16] FIG. 3 is a diagram illustrating an example (3) of PUCCH carrier switching in an embodiment of the present invention. [Figure 17] FIG. 4 is a diagram illustrating an example of disabling PUCCH carrier switching in an embodiment of the present invention. [Figure 18] FIG. 5 is a diagram illustrating an example (1) of PUCCH transmission power control in an embodiment of the present invention. [Figure 19] FIG. 6 is a diagram illustrating an example (2) of PUCCH transmission power control in an embodiment of the present invention. [Figure 20] FIG. 7 is a diagram illustrating an example (3) of PUCCH transmission power control in an embodiment of the present invention. [Figure 21] FIG. 8 is a diagram illustrating an example (4) of PUCCH transmission power control in an embodiment of the present invention. [Figure 22] FIG. 9 is a diagram illustrating an example (5) of PUCCH transmission power control in an embodiment of the present invention. [Figure 23] FIG. 10 is a diagram illustrating an example of spatial relationship in an embodiment of the present invention. [Figure 24] FIG. 11 is a diagram illustrating an example (6) of PUCCH transmission power control in an embodiment of the present invention. [Figure 25] FIG. 12 is a diagram illustrating an example (1) of UCI multiplexing in an embodiment of the present invention. [Figure 26] FIG. 13 is a diagram illustrating an example (2) of UCI multiplexing in an embodiment of the present invention. [Figure 27] FIG. 14 is a diagram illustrating an example (3) of UCI multiplexing in an embodiment of the present invention. [Figure 28] FIG. 15 is a diagram illustrating an example (4) of UCI multiplexing in an embodiment of the present invention. [Figure 29] FIG. 16 is a diagram illustrating an example (5) of UCI multiplexing in an embodiment of the present invention. [Figure 30] FIG. 17 is a diagram illustrating an example (1) of HARQ-ACK offset in an embodiment of the present invention. [Figure 31]This figure shows an example (2) of a HARQ-ACK offset in an embodiment of the present invention. [Figure 32] This figure shows an example (3) of a HARQ-ACK offset in an embodiment of the present invention. [Figure 33] This figure shows an example (4) of a HARQ-ACK offset in an embodiment of the present invention. [Figure 34] This figure shows an example (5) of a HARQ-ACK offset in an embodiment of the present invention. [Figure 35] This figure shows an example (6) of a HARQ-ACK offset in an embodiment of the present invention. [Figure 36] This figure shows an example of the functional configuration of the base station 10 in an embodiment of the present invention. [Figure 37] This figure shows an example of the functional configuration of terminal 20 in an embodiment of the present invention. [Figure 38] This figure shows an example of the hardware configuration of a base station 10 or terminal 20 in an embodiment of the present invention. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to those described below.

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

[0012] Figure 1 is a diagram illustrating an example (1) of a wireless communication system in an embodiment of the present invention. The wireless communication system in the embodiment of the present invention includes a base station 10 and a terminal 20, as shown in Figure 1. Although Figure 1 shows one base station 10 and one terminal 20, this is an example, and there may be multiple base stations 10 and terminals 20.

[0013] Base station 10 is a communication device that provides one or more cells and performs wireless communication with terminal 20. The physical resources of the wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of OFDM symbols, and the frequency domain may be defined by the number of subcarriers or resource blocks. In addition, the TTI (Transmission Time Interval) in the time domain may be a slot, or the TTI may be a subframe.

[0014] Base station 10 is capable of performing carrier aggregation (CA), which involves bundling multiple cells (multiple CCs (component carriers)) to communicate with terminal 20. Carrier aggregation uses one PCell (Primary Cell) and one or more SCells (Secondary Cells).

[0015] The base station 10 transmits synchronization signals and system information to the terminal 20. Synchronization signals include, for example, NR-PSS and NR-SSS. System information is transmitted via, for example, NR-PBCH or PDSCH, and is also called broadcast information. As shown in Figure 1, the base station 10 transmits control signals or data to the terminal 20 via DL (Downlink) and receives control signals or data from the terminal 20 via UL (Uplink). Here, signals transmitted via control channels such as PUCCH (Physical Uplink Shared Channel) and PDCCH (Physical Downlink Control Channel) are called control signals, and signals transmitted via shared channels such as PUSCH (Physical Uplink Shared Channel) and PDSCH (Physical Downlink Shared Channel) are called data, but this is just one example of terminology.

[0016] Terminal 20 is a communication device equipped with wireless communication capabilities, such as a smartphone, mobile phone, tablet, wearable device, or M2M (Machine-to-Machine) communication module. As shown in Figure 1, 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. Terminal 20 may also be referred to as UE, and base station 10 as gNB.

[0017] Figure 2 is a diagram illustrating an example (2) of a wireless communication system in an embodiment of the present invention. Figure 2 shows an example configuration of a wireless communication system when dual connectivity (DC) is implemented. As shown in Figure 2, the system is provided with a base station 10A which acts as a master node (MN) and a base station 10B which acts as a secondary node (SN). Base stations 10A and 10B are each connected to the core network 30. Terminal 20 can communicate with both base station 10A and base station 10B.

[0018] The cell group provided by base station 10A, which is the MN (Mobile Network Unit), is called the Master Cell Group (MCG), and the cell group provided by base station 10B, which is the SN (Station Network Unit), is called the Secondary Cell Group (SCG). In dual connectivity, the MCG consists of one PCell and zero or more SCells, and the SCG consists of one PSCell (Primary SCG Cell) and zero or more SCells. PCell or PSCell may also be written as SpCell (Special Cell).

[0019] Dual connectivity may also be a communication method that utilizes two communication standards, and any combination of communication standards is acceptable. For example, the combination could be NR and 6G standards, or LTE and 6G standards. Furthermore, dual connectivity may also be a communication method that utilizes three or more communication standards, and may be referred to by a different name than dual connectivity.

[0020] The processing operations in this embodiment may be performed using the system configuration shown in Figure 1, the system configuration shown in Figure 2, or any other system configuration.

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

[0022] Here, the PUCCH resource is set to PCell, PSCell, or PUCCH-SCell. The terminal could not send PUCCH using anything other than PCell, PSCell, or PUCCH-SCell. The cell used to send PUCCH was predetermined and difficult to change flexibly.

[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, for PUCCH group 1, it was possible to send PUCCH only on CC0, and not on CC1. For PUCCH group 2, it was possible to send PUCCH only on CC2, and not on CC3. Furthermore, since PUCCH-SCell cannot be set in intraband CA, it was difficult to flexibly change which CC to use to send PUCCH in the intraband.

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

[0026] For example, the semi-static setting may be based on the timing pattern of the PUCCH cell set by RRC (Radio Resource Control), or PUCCH carrier switching between cells with different neurology or subcarrier intervals may be supported. A PUCCH cell may be a cell capable of transmitting PUCCH.

[0027] Furthermore, a maximum number of PUCCH cells may be specified. Also, dynamic and semi-static configurations may be integrated and applied to PUCCH carrier switching. Furthermore, PUCCH carrier switching and SPS (Semi-persistent) HARQ-ACK deferral may be integrated and applied.

[0028] Figure 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 the PUCCH to which the received PDSCH will transmit a HARQ-ACK. Terminal 20 may determine the cell or carrier to transmit the PUCCH, the resource to transmit the PUCCH, and the transmit power when 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 substituted for each other. In the following step S3, terminal 20 transmits the determined PUCCH to base station 10.

[0029] For example, base station 10 may specify the destination CC for PUCCH using RRC, MAC-CE (Medium Access Control - Control Element), or DCI. Terminal 20 may then transmit PUCCH with the specified CC.

[0030] For example, RRC, MAC-CE, or DCI may switch between PUCCH#1 transmitted via PCell or PSCell and PUCCH#2 transmitted via PUCCH-SCell.

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

[0032] Of all configured CCs, one or more CC lists containing some CCs may be selected or configured based on predetermined rules. For example, such predetermined rules may include a predetermined number of CCs in a single list, starting with the smallest CCID. This predetermined number may be defined by the specifications, configured by the higher layer, or notified from the terminal 20 to the base station 10 through a UE capability report.

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

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

[0035] 1) When the carrier sending the PUCCH is dynamically instructed. 2) When the carrier transmitting PUCCH is instructed to be semi-static. For example, when PUCCH carrier switching is performed only when PUCCH cannot be transmitted in the slot that transmits PUCCH as indicated by the HARQ feedback timing indicator.

[0036] As mentioned above, sending a PUCCH allows for resource distribution because the degree of resource congestion used by the UE differs for each CC. Furthermore, since TDD settings may differ for each CC, PUCCH can be sent at a more flexible timing.

[0037] Figure 5 shows an example (2) of PUCCH transmission in an embodiment of the present invention. The CC of PUCCH, which transmits UCIs in a batch, may be indicated or selected by MAC-CE and / or DCI from a predetermined list of CC candidates, for example, a first CC list shown in Figure 5. By setting or defining a first CC list, the candidates of CC that can be indicated by MAC-CE and / or DCI can be limited, thereby reducing signaling overhead and reducing the complexity of the UE.

[0038] Furthermore, as shown in Figure 5, a second CC list indicating which CCs' UCIs (e.g., HARQ, CSI, etc.) should be transmitted together via PUCCH may or may not be notified from the base station 10 to the terminal 20. If the second list is not notified, the terminal 20 may transmit the UCIs of all CCs together via PUCCH. These "all CCs" may include all CCs, including SpCells and SCells, or they may include all CCs within a PUCCH cell group.

[0039] Figure 6 shows an example (3) of PUCCH transmission in an embodiment of the present invention. As shown in Figure 6, the TDD setting may differ for each CC. If the slot instructed as the HARQ timing is DL, and there is a UL in another CC in that slot, it is possible to reduce the HARQ delay compared to conventional methods by sending a HARQ-ACK in that other CC, thereby improving URLLC performance.

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

[0041] In embodiments of the present invention, the CC that transmits PUCCH can be switched even when there is no instruction for PUCCH carrier switching by MAC-CE or DCI, by pre-setting the CC that transmits PUCCH using RRC, or by the terminal 20 searching for available CCs. Furthermore, PUCCH may be transmitted in the same slot as the slot indicated by the HARQ feedback timing indicator, or in a slot where at least a portion of the SCS overlaps with a different SCS. If multiple CCs are available, a priority order may be defined or set in advance for the CCs. For example, the CC with the smaller CC index may be given priority and PUCCH may be transmitted. Candidate CCs that transmit the PUCCH to be switched may be set in advance by the upper layer. This prevents PUCCH from being transmitted in CCs that should not be transmitted to the terminal 20.

[0042] Figure 7 shows an example (4) of PUCCH transmission in an embodiment of the present invention. Figure 8 shows an example (5) of PUCCH transmission in an embodiment of the present invention. If the slot indicated by the HARQ feedback timing indicator is unavailable in the CC that transmits PUCCH, terminal 20 may switch the CC that transmits PUCCH. Furthermore, as shown in Figure 7 or Figure 8, if there are no other available CCs in the same slot or in slots that overlap in at least part, terminal 20 may change the slot that transmits HARQ-ACK. Figure 7 is an example of changing to an earlier available slot in the time domain, and Figure 8 is 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 are no other available CCs.

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

[0044] Figure 9 shows an example (6) of PUCCH transmission in an embodiment of the present invention. As shown in Figure 9, terminal 20 may transmit a HARQ-ACK in the slot and CC that can transmit a PUCCH as soon as possible after a predetermined time has elapsed since receiving a PDSCH. Note that HARQ-ACK may mean HARQ feedback, and may include ACK (positive response) or NACK (negative response). If the operation is set from a higher layer, the UE may omit some or all of the HARQ feedback timing indicator fields in DCI format 1_0, DCI format 1_1, and DCI format 1_2. For PDSCH scheduled in a DCI where HARQ feedback timing indicator fields do not exist, the HARQ-ACK may be transmitted in the slot and CC that can transmit a PUCCH as soon as possible after a predetermined time has elapsed since receiving the PDSCH. In the method shown in Figure 9, the delay of HARQ feedback is minimized, and signaling such as HARQ feedback timing indicators is not required, thus reducing DCI overhead.

[0045] In the example shown in Figure 9, after receiving PDSCH, terminal 20 transmits PUCCH in SCell#1, which is available in the nearest slot after a predetermined time has elapsed. If multiple CCs are available, a priority order between CCs may be defined or set in advance. For example, CCs with smaller CC indices may be given priority for PUCCH transmission. In addition, candidate CCs to which PUCCH will be switched may be set in advance by a higher layer. This prevents PUCCH from being transmitted in CCs that should not be transmitted to terminal 20.

[0046] For example, the base station 10 may instruct or select the CC to transmit PUCCH to the terminal 20 using DCI. The CC to transmit PUCCH may be instructed using predetermined fields of DCI as shown in 1)-3) below.

[0047] 1) A new CC instruction field may be defined to indicate the CC that transmits PUCCH. For example, a new CC instruction field may be defined in part or all of DCI formats 1_0, 1_1, and 1_2, which are DCIs that schedule DLs. Table 1 shows examples of new CC instruction fields.

[0048] [Table 1]

[0049] As shown in Table 1, the DCI code point specifies the CC to which PUCCH is transmitted. Table 1 shows an example where the CC instruction field is 2 bits. The CC index associated with each DCI code point may be notified by RRC or MAC-CE.

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

[0051] [Table 2]

[0052] As shown in Table 2, each PUCCH resource may be associated with a CC that sends PUCCH. The destination CC associated with each PUCCH resource may be configured by a higher layer.

[0053] 3) Existing DCI fields may be used to indicate the CC that will transmit PUCCH. For example, the Carrier Indicator field (CIF) may be used to indicate the CC that will transmit PUCCH. For example, if PUCCH carrier switching is configured regardless of whether PDSCH is cross-carrier scheduled or not, the CIF may be assumed to exist. The base station 10 may use the CIF to indicate the CC that will transmit PUCCH to the terminal 20.

[0054] Furthermore, when cross-carrier scheduling is configured, a common CIF may be used to specify the CC on which the PDSCH is scheduled and the CC on which the PUCCH is transmitted. Alternatively, the CC on which the PDSCH is scheduled may be specified using a CIF, and the CC on which the PUCCH is transmitted may be specified using the method described in 1) or 2) above. Alternatively, the CIF may be extended, with the first CIF used to specify the CC on which the PDSCH is scheduled and the second CIF used to specify the CC on which the PUCCH is transmitted.

[0055] Figure 10 shows an example (7) of PUCCH transmission in an embodiment of the present invention. When transmitting HARQ-ACKs in PUCCH corresponding to multiple PDSCHs triggered or scheduled by multiple DCIs, the CC to transmit the PUCCH indicated by each DCI may be set or predetermined. For example, as shown in Figure 10, the CC to transmit the PUCCH (CC0 in Figure 10) may be determined based on the last DCI in the time and frequency directions.

[0056] Figure 11 shows an example of a MAC-CE in an embodiment of the present invention. The base station 10 may instruct the terminal 20 via MAC-CE to transmit a PUCCH. As shown in Figure 11, a MAC-CE that instructs the CC to transmit a PUCCH may be defined. The terminal 20 may transmit a PUCCH with the CC instructed by the MAC-CE. One MAC-CE per cell group may instruct the cell to transmit a PUCCH, or one MAC-CE per UE may instruct the cell to transmit a PUCCH.

[0057] In the example shown in Figure 10, the MAC-CE may include a cell group index, and the size of the bits indicating the cell group index may be determined according to the number of cell groups. Also, if the cell to send PUCCH is not specified on a cell group basis, the cell group index does not need to be included in the MAC-CE. For example, in the example shown in Figure 10, one cell to send PUCCH from a maximum of 8 cells is specified. Terminal 20 is C n A PUCCH may be sent in a cell with =1. Furthermore, in the MAC-CE, cells may be notified by cell index rather than bitmap. For example, when notifying a cell that sends one PUCCH from 8 cells, the corresponding bit width in the MAC-CE may consist of 3 bits.

[0058] Figure 12 shows 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 transmitting the PUCCH as indicated by MAC-CE and / or DCI, as shown in Figure 12. For example, terminal 20 may use the PUCCH resource of a scheduled cell indicated by information indicating the CC transmitting the PRI or PUCCH.

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

[0060] Furthermore, when performing PUCCH carrier switching, terminal 20 may use a PUCCH resource located in the CC that receives the PDSCH scheduled by the last DCI.

[0061] Furthermore, PUCCH-config may be set for each BWP (Bandwidth Part). The "CC" mentioned above may be replaced with "BWP within the CC". Furthermore, embodiments of the present invention may operate when PUCCH carrier switching is configured. Also, "PUCCH carrier switching" may be read as "being instructed by RRC, MAC-CE and / or DCI to transmit PUCCH". Furthermore, slot and sub-slot may be read as interchangeable. Furthermore, SUL (Supplementary Uplink) may or may not be included in the target CC for PUCCH carrier switching. Whether or not SUL is included in the target CC for PUCCH carrier switching may be reported from terminal 20 to base station 10 by UE capability report.

[0062] Embodiments of the present invention may be applied to terminal 20 that has reported the UE capabilities shown in 1) and / or 2) below.

[0063] 1) UE capability indicating whether or not it supports PUCCH carrier switching. For example, this may be UE capability indicating whether or not it is instructed to transmit PUCCH in RRC, MAC-CE and / or DCI. Alternatively, it may be UE capability indicating whether or not it is instructed to transmit PUCCH in MAC-CE. Alternatively, it may be UE capability indicating whether or not it is instructed to transmit PUCCH in DCI.

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

[0065] Furthermore, as a UE capability, the CC to which PUCCH carrier switching will be switched may be set to one or more NR carrier types as described below. For example, terminal 20 may report the carrier types to which PUCCH transmission is possible, and PUCCH carriers 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 for a CC to transmit PUCCH may be specified. For example, the time between when a CC to transmit PUCCH is instructed by RRC, MAC-CE and / or DCI and when PUCCH carrier switching is actually applied may be specified.

[0069] The base station 10 and the terminal 20 must have a common understanding of the CC that transmits PUCCH. By defining the timing of application of the CC's instructions for transmitting PUCCH, the base station 10 can recognize, for example, that the instructions are not valid if the terminal 20 fails to receive them.

[0070] Furthermore, PUCCH carrier switching may have an enabled or disabled state. The CC instruction to send PUCCH may be called an activation command, and a separate activation command to enable the instruction may be defined. In addition, a deactivation command to disable the instruction may be defined.

[0071] Figure 14 shows an example (1) of PUCCH carrier switching in an embodiment of the present invention. As shown in Figure 14, the assumption of the CC that transmits PUCCH may be switched after a predetermined time has elapsed from the time an ACK is sent to the MAC-CE that instructs the CC that transmits PUCCH. This predetermined time may be, for example, 3 ms later, or it may be until the start of the next slot after 3 ms has elapsed. Note that instructing by MAC-CE may mean that MAC-CE alone instructs the CC that transmits PUCCH, or MAC-CE may instruct a CC list containing multiple CCs and DCI may instruct one CC.

[0072] Figure 15 shows an example (2) of PUCCH carrier switching in an embodiment of the present invention. As shown in Figure 15, the assumption of the CC transmitting PUCCH may be switched before the transmission of PUCCH / PUSCH, when an ACK / NACK is sent to the DCI indicating the CC transmitting PUCCH.

[0073] Figure 16 shows an example (3) of PUCCH carrier switching in an embodiment of the present invention. As shown in Figure 16, the assumption of the CC transmitting PUCCH may be switched after a predetermined time has elapsed from the time an ACK is sent to the DCI indicating the CC transmitting PUCCH. This predetermined time may be, for example, 3 ms, or it may be until the start of the next slot after 3 ms has elapsed.

[0074] Furthermore, a deactivation timing may be specified. For CCs that previously sent PUCCHs and were activated, the CCs that previously sent PUCCHs may be considered deactivated when the next CC to send a PUCCH is activated.

[0075] Figure 17 shows an example of PUCCH carrier switching disabling in an embodiment of the present invention. A disabling command is defined, and terminal 20 that receives the disabling command may disable PUCCH carrier switching. The disabling command may be notified by MAC-CE or instructed by DCI. Disabling may occur after a predetermined time or period has elapsed after receiving an enable command or after an instruction from CC to send PUCCH via MAC-CE and / DCI. As shown in Figure 17, during the disabling period, the operation may fall back to sending PUCCH using PCell, PSCell, or PUCCH-SCell.

[0076] Furthermore, if the instruction of the CC sending PUCCH as shown in Figure 14 is an invalid MAC-CE, the assumption of the CC sending PUCCH may be switched after a predetermined time has elapsed from the time an ACK is sent to the MAC-CE. This predetermined time may be, for example, 3ms or until the start of the next slot after 3ms has elapsed.

[0077] Furthermore, if the instruction of the CC to send PUCCH as shown in Figure 15 is a DCI indicating invalidation, the assumption of the CC sending PUCCH may be switched before the PUCCH / PUSCH is sent and an ACK / NACK is sent to that DCI.

[0078] Furthermore, if the CC's instruction to send PUCCH as shown in Figure 16 is a DCI indicating invalidation, the assumption of the CC sending PUCCH may be switched after a predetermined time has elapsed from the time an ACK is sent for that DCI. This predetermined time may be, for example, 3ms later, or it may be until the start of the next slot after 3ms has elapsed.

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

[0080] When PUCCH carrier switching is configured, the parameters for PUCCH power control may be those set in the CC (or BWP) transmitting PUCCH to determine the PUCCH transmit power. These parameters may be those included in pucch-PowerControl in PUCCH-Config and the PUCCH spatial relation in the PUCCH resource.

[0081] Furthermore, regarding OL-PC (Open loop power control) and CL-PC (Closed loop power control) in PUCCH carrier switching, both of the following 1) and 2) may be considered.

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

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

[0084] Figure 19 shows an example (2) of PUCCH transmit power control in an embodiment of the present invention. When performing PUCCH carrier switching, as shown in Figure 19, terminal 20 may use a PUCCH power control parameter set on the CC that received a DCI indicating information indicating the CC that transmits PRI or PUCCH. For example, terminal 20 may use a PUCCH power control parameter of the scheduling cell that indicates information indicating the CC that transmits PRI or PUCCH. Also, as shown in Figure 19, when transmitting scheduled PUCCH from multiple CCs, terminal 20 may use a PUCCH power control parameter set on the CC that received the last DCI in the time and frequency direction (last DCI).

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

[0086] Figure 20 shows an example (3) of PUCCH transmission power control in an embodiment of the present invention. As shown in Figure 20, when PUCCH carrier switching is performed or instructed, terminal 20 may reset the TPC (Transmission Power Control) command cumulative value or set the value to 0. For example, the TPC command cumulative value for PUCCH in CC0 may be a different value from the TPC command cumulative value for PUCCH in CC1 because the frequency and propagation path are different.

[0087] Figure 21 shows an example (4) of PUCCH transmit power control in an embodiment of the present invention. As shown in Figure 21, terminal 20 may accumulate TPC command cumulative values ​​before and after or before instructing PUCCH carrier switching.

[0088] Figure 22 shows an example (5) of PUCCH transmission power control in an embodiment of the present invention. As shown in Figure 22, the cumulative value of CL-PC may be maintained for each CC. For example, if a TPC command is instructed for the PUCCH resource of CC0, it may be maintained as the cumulative value of the TPC command for CC0's PUCCH, or if a TPC command is instructed for the PUCCH resource of CC1, it may be maintained as the cumulative value of the TPC command for CC1's PUCCH. In the example shown in Figure 22, CC1's PUCCH is not transmitted. Subsequently, if CC1 is instructed as the CC to transmit PUCCH, the PUCCH may be transmitted using the cumulative value of the TPC command accumulated by CC1.

[0089] Figure 23 shows an example of a spatial relationship in an embodiment of the present invention. As shown in Figure 23, when transmitting to one base station 10, the path loss will differ if the beam, i.e., the spatial relationship, is different. Also, when transmitting to two base stations 10, the path loss will differ. Therefore, the terminal 20 is able to hold two different cumulative values ​​of CL-PC.

[0090] For each PUCCH resource, one spatial relationship is established. Furthermore, closedLoopIndex={i0,i1} is notified. PUCCH resources to which i0 is notified and PUCCH resources to which i1 is notified independently maintain the cumulative TPC command value of CL-PC.

[0091] Figure 24 shows an example (6) of PUCCH transmission power control in an embodiment of the present invention. Since the closedLoopIndex of PUCCH is set within the spatialRelation of PUCCH for each PUCCH resource, in the PUCCH resource determined by the above-described embodiment of the present invention, the closedLoopIndex={i0,i1} of PUCCH set within the spatialRelation of PUCCH set for the determined PUCCH resource may be used.

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

[0093] Note that closedLoopIndex is just one example of a TPC parameter, and other RRC parameters applied to PUCCH power control, such as P0, α values, PL-RS, etc., may also be set on terminal 20 using a similar mechanism to closedLoopIndex. For example, if a PUCCH resource is switched due to PUCCH carrier switching, the TPC parameters associated with the PUCCH resource to be switched over may be applied using the same mechanism.

[0094] Figure 25 shows an example (1) of UCI multiplexing in an embodiment of the present invention. As shown in Figure 25, if the HARQ feedback timing indicator field indicates that multiple UCIs should 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] The following describes how to dynamically perform PUCCH carrier switching, taking into account the neurology or subcarrier spacing (SCS) of the CC transmitting PUCCH.

[0096] Figure 26 shows an example (2) of UCI multiplexing in an embodiment of the present invention. As shown in Figure 26, if CC0 and CC1 have different SCSs and the SCS of the CC transmitting PUCCH is small, the two UCIs will not be transmitted in the same slot. CC0 is instructed to transmit HARQ-ACK in slot #n, and CC1 is instructed to transmit HARQ-ACK in slot #m. In the case shown in Figure 26, PUCCH may be transmitted in slot #n of CC0.

[0097] Figure 27 shows an example (3) of UCI multiplexing in an embodiment of the present invention. As shown in Figure 27, if CC0 and CC1 have different SCSs and the SCS of the CC transmitting PUCCH is small, the two UCIs will not be transmitted in the same slot. CC0 is instructed to transmit HARQ-ACK in slot #n, and CC1 is instructed to transmit HARQ-ACK in slot #m+1. In the case shown in Figure 27, PUCCH may be transmitted in slot #n of CC0.

[0098] Figure 28 shows an example (4) of UCI multiplexing in an embodiment of the present invention. As shown in Figure 28, if CC0 and CC1 have different SCSs and the SCS of the CC transmitting PUCCH is larger, the two UCIs will not be transmitted in the same slot. CC0 is instructed to transmit HARQ-ACK in slot #n, and CC1 is instructed to transmit HARQ-ACK in slot #m. In the case shown in Figure 28, PUCCH may be transmitted in slot #m of CC1.

[0099] Figure 29 shows an example (5) of UCI multiplexing in an embodiment of the present invention. As shown in Figure 29, if CC0 and CC1 have different SCSs and the SCS of the CC transmitting PUCCH is larger, the two UCIs will not be transmitted in the same slot. CC0 is instructed to transmit HARQ-ACK in slot #n, and CC1 is instructed to transmit HARQ-ACK in slot #m+1. In the case shown in Figure 29, PUCCH may be transmitted in slot #m+1 of CC1.

[0100] The conditions under which UCI is duplicated using the same PUCCH resource may be those shown in 1)-3) below.

[0101] 1) When at least a portion of the PUCCH slots or subslots at the time indicated by each CC overlap. If at least a portion of the PUCCH resource slots or subslots overlap in the PUCCH CC at the time indicated, the UCI may be multiplexed. It is conceivable that the PUCCH CC at the time the PUCCH resource was indicated in the past and the CC that actually transmits the PUCCH may be different when PUCCH carrier switching occurs, but terminal 20 may use the SCS and slots or subslots of the PUCCH CC at the time the PUCCH resource was indicated or triggered to determine the conditions under which the UCI will be multiplexed with the same PUCCH resource and to determine the timing of UCI transmission.

[0102] 2) When at least a portion of the PUCCH slot or subslot overlaps at the time of actual transmission. If, after the CC transmitting the PUCCH is indicated and the CC transmitting the PUCCH is determined, i.e., after the PUCCH carrier switching is performed, the UCI may overlap at least a portion of the slot or subslot of the CC transmitting the PUCCH. If there is no overlap with the slot or subslot of the CC transmitting the PUCCH, the UCI may be transmitted without being multiplexed.

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

[0104] In the above, the presence or absence of PUCCH multiplexing was determined by whether or not PUCCH slots or sub-slots overlapped. However, terminal 20 may also determine the presence or absence of PUCCH multiplexing by whether or not at least one symbol of the PUCCH resource overlaps in the time domain.

[0105] Figure 30 shows an example (1) of the HARQ-ACK offset in an embodiment of the present invention. The timing for transmitting the HARQ-ACK is indicated by the offset k of the PDSCH receiving slot. The UCI of each CC is transmitted using either a PCell, PSCell, or PUCCH-SCell, and it may be predetermined which CC's UCI is transmitted using which CC's PUCCH. That is, the CCs transmitting PUCCH do not need to be updated by the RRC, MAC-CE, or DCI.

[0106] As shown in Figure 30, the CC slot that transmits the same PUCCH as the PDSCH receiving slot, or the CC slot that transmits overlapping PUCCHs, corresponds to k=0, and the count may be performed using the CC slot that transmits the PUCCH until k=K1. For example, if a PUCCH-SCell is not set and no PUCCH carrier switching is performed, the k value may be counted using the SpCell slot that is the same as the PDSCH receiving slot.

[0107] For example, if PUCCH-SCell is not set, the UCI of all CCs is sent with the PUCCH of the SpCell. Therefore, the timing for sending the HARQ-ACK of all CCs may be indicated by the slot or sub-slot offset of the HARQ-ACK in the CC that sends the SpCell, i.e., the PUCCH.

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

[0109] In PUCCH carrier switching, the CC transmitting PUCCH may be updated in the RRC, MAC-CE, and / or DCI. The timing for transmitting HARQ-ACK may be counted and indicated as follows, specifying which CC should transmit HARQ-ACK as a slot or sub-slot, as shown in 1)-4) below.

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

[0111] Figure 31 shows an example (2) of the HARQ-ACK offset in an embodiment of the present invention. For example, if PUCCH-SCell is not set, an offset of the slot or subslot to transmit the HARQ-ACK in each CC, assuming that PUCCH is transmitted in a PCell or PSCell i.e., SpCell, may be indicated, as shown in Figure 31.

[0112] In the example shown in Figure 31, PUCCH is transmitted in a slot with m=0 in a different SCell of the SCS, but PUCCH may also be transmitted in a slot with m=1. Whether m=0 or m=1 may be specified by the specification or indicated by a higher layer. When terminal 20 identifies a slot for PUCCH to be transmitted from the CC of a larger SCS to the CC of a smaller SCS, it may transmit PUCCH in a slot of the narrower SCS that partially overlaps with the slot of the larger SCS. The same method may be used to identify slots when the SCSs differ between CCs.

[0113] Furthermore, for example, if a PUCCH-SCell is configured, a slot or subslot may be specified to send a HARQ-ACK for a PCell or PSCell, assuming that a PUCCH is sent by the PCell or PSCell. Similarly, a slot or subslot may be specified to send a HARQ-ACK for CCs other than PCell and PSCell, assuming that a PUCCH is sent by the PUCCH-SCell.

[0114] 2) Figure 32 shows an example (3) of a HARQ-ACK offset in an embodiment of the present invention. As shown in Figure 32, a slot or subslot is designated to transmit a HARQ-ACK assuming a PUCCH destination CC. The method for determining the PUCCH destination CC may be the PUCCH switching method in an embodiment of the present invention. Alternatively, a slot or subslot is designated to transmit a HARQ-ACK assuming a PUCCH destination CC at any of the following points in time: the time of receiving the DCI that triggered the UCI, the time of receiving the PDSCH, or the time of transmitting the PUCCH. Which of these points in time is used may be specified in the specification, set at a higher layer, or notified in the UE capability report.

[0115] 3) Figure 33 shows an example (4) of a HARQ-ACK offset in an embodiment of the present invention. As shown in Figure 33, the UCI of each CC may indicate a slot or subslot to transmit a HARQ-ACK assuming the CC received the PDSCH.

[0116] 4) Assuming the CC received the DCI that triggered the UCI, a slot or sub-slot to send the HARQ-ACK may be indicated.

[0117] Figure 34 shows an example (5) of the HARQ-ACK offset in an embodiment of the present invention. As shown in Figure 34, assuming a CC that transmits a PUCCH that was to be transmitted at the time of DCI reception or PDSCH reception, the timing for transmitting the HARQ-ACK can be determined, and the PUCCH may be transmitted in a slot or sub-slot that overlaps with that timing. Figure 34 shows an example of the timing for transmitting the HARQ-ACK when the CC that transmits the PUCCH is updated from SCell#2 to SpCell. The k value count is performed in the slot in SCell#2.

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

[0119] Previously, it was only possible to configure PUCCH-Config for SpCell and PUCCH-SCell. Therefore, in the cell to which PUCCH carrier switching transitions, either the SpCell or PUCCH-SCell configuration may be applied.

[0120] Furthermore, PUCCH-Config may be configured for SCells other than SpCell and PUCCH-SCell, but only for terminal 20 where PUCCH carrier switching (instructing the CC to transmit PUCCH via RRC, MAC-CE, and / or DCI) is configured. However, this may be limited to SCells corresponding to CCs included in the CC list that are the transition destinations for PUCCH carrier switching configured at the upper layer.

[0121] If PUCCH carrier switching (instructing the CC to transmit PUCCH via RRC, MAC-CE, and / or DCI) is not configured, PUCCH-Config may be configured on up to one additional SCell, or on up to one serving cell per FR.

[0122] The above embodiment allows for flexible configuration of the target carrier for PUCCH carrier switching in terminal 20. Furthermore, it enables clear control of PUCCH transmit power when PUCCH carrier switching is performed. Additionally, it allows for clear timing of HARQ-ACK transmission when PUCCH carrier switching is performed, even when SCS differs.

[0123] In other words, in a wireless communication system, the settings related to the transmission of the uplink control channel can be clearly defined.

[0124] (Device configuration) Next, we will describe an example of the functional configuration of the base station 10 and terminal 20 that perform the processes and operations described above. The base station 10 and terminal 20 include functions to perform the embodiments described above. However, the base station 10 and terminal 20 may each be equipped with only one of the proposed functions from the embodiments.

[0125] <Base station 10> Figure 36 shows an example of the functional configuration of a base station 10. As shown in Figure 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 Figure 36 is merely an example. The names of the functional categories and functional units can be anything as long as they can perform the operations according to the embodiment of the present invention. The transmitting unit 110 and the receiving unit 120 may be called the communication unit.

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

[0127] The setting unit 130 stores pre-configured setting information and various setting information to be transmitted to the terminal 20 in a storage device and reads it from the storage device as needed. The control unit 140 performs control of the entire base station 10, including control related to signal transmission and reception. The signal transmission function unit of the control unit 140 may be included in the transmission unit 110, and the signal reception function unit of the control unit 140 may be included in the reception unit 120. The transmission unit 110 and the reception unit 120 may also be called the transmitter and receiver, respectively.

[0128] <Terminal 20> Figure 37 shows an example of the functional configuration of terminal 20. As shown in Figure 37, 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 Figure 37 is merely an example. The names of the functional categories and functional units can be anything as long as they can perform the operations according to the embodiment of the present invention. The transmitting unit 210 and the receiving unit 220 may be called the communication unit.

[0129] The transmitting unit 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiving unit 220 wirelessly receives various signals and obtains signals from higher layers from the received physical layer signals. The transmitting unit 210 also transmits a HARQ-ACK, and the receiving unit 220 receives the configuration information and the like as described in the embodiment.

[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 from the storage device as needed. The setting unit 230 also stores pre-set setting information. The control unit 240 controls the entire terminal 20, including control related to signal transmission and reception. The signal transmission function in the control unit 240 may be included in the transmission unit 210, and the signal reception function in the control unit 240 may be included in the reception unit 220. The transmission unit 210 and the reception unit 220 may also be called the transmitter and receiver, respectively.

[0131] (Hardware configuration) The block diagrams (Figures 36 and 37) used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may be realized by combining the above one device or the above multiple devices with software.

[0132] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. As mentioned above, the method of implementation is not particularly limited.

[0133] For example, the base station 10, terminal 20, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 38 is a diagram showing an example of the hardware configuration of the base station 10 and terminal 20 according to one embodiment of the present disclosure. The above-mentioned base station 10 and terminal 20 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 explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the base station 10 and terminal 20 may include one or more of the devices shown in the figure, or it may be configured without some of the devices.

[0135] Each function in the base station 10 and terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and storage device 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of the reading and writing of data in the storage device 1002 and auxiliary storage device 1003.

[0136] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic units, registers, etc. For example, the control unit 140, control unit 240, etc., described above may be implemented by the processor 1001.

[0137] Furthermore, the processor 1001 reads programs (program code), software modules, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 140 of the base station 10 shown in Figure 36 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in Figure 37 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Although the above-described processes have been explained as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunications line.

[0138] The storage device 1002 is a computer-readable recording medium and may consist of at least one of the following: ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may also be called a register, cache, main memory, etc. The storage device 1002 can store executable programs (program code), software modules, etc., for implementing a communication method according to one embodiment of this disclosure.

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

[0140] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may include high-frequency switches, duplexers, filters, frequency synthesizers, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the transmit / receive antenna, amplifier section, transmit / receive section, transmission path interface, etc., may be implemented by the communication device 1004. The transmit / receive section may be implemented with physically or logically separated transmitting and receiving sections.

[0141] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., 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 different buses may be configured for each device.

[0143] Furthermore, the base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and some or all of each functional block may be realized by such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0144] (Summary of the embodiments) As described above, according to an embodiment of the present invention, the device includes a receiving unit that receives control information and data from a base station, a control unit that determines a carrier to transmit an uplink control channel based on the control information, and a transmitting unit that transmits information relating to data retransmission control on the determined carrier to the base station via the uplink control channel, wherein the control unit is provided with a terminal that sets the timing for when the determined carrier is activated and when it is deactivated.

[0145] With the above configuration, the timing at which PUCCH carrier switching is performed in terminal 20 can be clearly defined. In other words, the settings related to transmission of the uplink control channel can be clearly defined in the wireless communication system.

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

[0147] The transmitting unit may transmit information relating to the retransmission control of the data to the base station via the uplink control channel using power control parameters applied to the carrier instructed by the control information. This configuration makes it possible to clearly define PUCCH transmit power control when PUCCH carrier switching is performed at terminal 20.

[0148] The control unit may reset the cumulative value of the TPC (Transmission Power Control) command applied to the uplink control channel when the transmitting carrier is instructed to use the uplink control channel based on the control information. This configuration makes it possible to clearly define PUCCH transmit power control when PUCCH carrier switching is performed at terminal 20.

[0149] The control unit may switch the closed-loop power control parameters relating to the spatial relationship applied to the uplink control channel when the transmitting carrier is instructed to use the uplink control channel based on the control information. This configuration makes it possible to clearly define PUCCH transmit power control when PUCCH carrier switching is performed at terminal 20.

[0150] Furthermore, according to an embodiment of the present invention, a communication method in which a terminal performs a receiving procedure for receiving control information and data from a base station; a control procedure for determining a carrier to transmit an uplink control channel based on the control information; a transmission procedure for transmitting information relating to data retransmission control on the determined carrier to the base station via the uplink control channel; and a procedure for setting the timing at which the determined carrier is activated and the timing at which it is deactivated. It will be provided.

[0151] With the above configuration, the timing at which PUCCH carrier switching is performed in terminal 20 can be clearly defined. In other words, the settings related to transmission of the uplink control channel can be clearly defined in the wireless communication system.

[0152] (Supplement to the embodiment) While 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, substitutions, etc. Specific numerical examples have been used to facilitate understanding of the invention, but 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, and matters described in two or more items may be combined as needed, and matters described in one item may be applied to matters described in another item (as long as they do not contradict each other). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical parts. The operation of multiple functional units may be physically performed by one part, or the operation of one functional unit may be physically performed by multiple parts. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as it does not contradict each other. For the convenience of explaining the processing, the base station 10 and terminal 20 have been described using functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to an embodiment of the present invention and the software operated by the processor of the terminal 20 according to an embodiment of the present invention may 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 embodiments / models described herein and may be carried out by other methods. For example, the notification of information may be carried out by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or combinations thereof. Also, RRC signaling may be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0154] Each aspect / embodiment described in this disclosure may be applied to at least one of the following systems: LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other appropriate systems, as well as next-generation systems extended based thereon. Furthermore, multiple systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A with 5G).

[0155] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described herein may be reordered, provided they are consistent with each other. For example, the methods described herein present various step elements in an exemplary order and are not limited to that specific order.

[0156] In this specification, specific operations performed by the base station 10 may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station 10, it is clear that various operations performed for communication with the terminal 20 can be performed by the base station 10 and at least one of the other network nodes (for example, an MME or S-GW, but not limited to these). Although the above example illustrates the case where there is one other network node besides the base station 10, the other network node may be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0157] The information or signals described in this disclosure may be output from a higher layer (or lower layer) to a lower layer (or higher layer). They may also be input and output via multiple network nodes.

[0158] Input and output information may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0159] The determination in this disclosure may be made by a value represented by one bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0160] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0161] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0162] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0163] In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and symbol may be a signal (signaling). Also, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, cell, frequency carrier, etc.

[0164] The terms “system” and “network” as used in this disclosure are interchangeable.

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

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

[0167] In this disclosure, terms such as "base station (BS)", "wireless 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. If a base station accommodates multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a Remote Radio Head (RRH)). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0169] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" 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 several other appropriate terms.

[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, the mobile body itself, etc. 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 be a device that does not necessarily move during communication operation. 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, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals 20 (which may be called, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, the terminals 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc., may be interpreted as side channel.

[0173] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station may be configured to have the same functions as the user terminal described above.

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

[0175] The terms “connected,” “coupled,” or any variation thereof, mean 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” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be reinterpreted as “access.” As used in this disclosure, two elements may be considered to be “connected” or “coupled” with each other using at least one of one or more wires, cables, and printed electrical connections, and, in some non-limiting and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

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

[0177] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0178] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, references to the first and second elements do not imply that only two elements may be employed, or that the first element must precede the second element in any way.

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

[0180] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0181] A wireless frame may consist of one or more frames in the time domain. Each of these frames in the time domain may be called a subframe. A subframe may further consist 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] Numerical logic may be communication parameters applied to at least one of the transmission and reception of a signal or channel. Numerical logic may include, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, and specific windowing processes performed by the transceiver in the time domain.

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

[0184] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. Minislots may also be called subslots. Minislots 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] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Different names may be used for each of these terms.

[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 mini-slot may be called a TTI. In other words, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, mini-slot, etc., instead of a subframe.

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

[0188] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0189] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0190] A TTI with a time length of 1ms may also be called a normal TTI, long TTI, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may also be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, mini slot, sub slot, slot, etc.

[0191] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

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

[0193] Furthermore, the time domain of RB may contain one or more symbols and may be the length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc., may each consist of one or more resource blocks.

[0194] One or more RBs may also be called a Physical RB (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

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

[0196] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a particular neurology system in a given carrier. These common RBs may be identified by an index of the RBs relative to a common reference point of the carrier. A Bandwidth Part (PRB) may be defined and numbered within a given BWP.

[0197] A BWP may include a BWP for UL (Ultraviolet Link) and a BWP for DL ​​(Download Link). One or more BWPs may be set for a terminal 20 within a single carrier.

[0198] At least one of the configured BWPs may be active, and terminal 20 does not need to be expected to send or receive a predetermined signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0199] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless 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, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0200] In this disclosure, if articles are added through translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0201] In this 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 "combine" may be interpreted similarly to "different."

[0202] Each aspect / embodiment described herein may be used individually, in combination, or switched between as needed during implementation. Furthermore, notification of specific information (e.g., notification that "X is") is not limited to explicit notification, but may also be implicit (e.g., by not providing such notification).

[0203] Although the present disclosure has been described in detail above, it will be 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 intent and scope of the present disclosure as defined by the claims. Therefore, the descriptions in the present disclosure are illustrative and not intended to be restrictive in any way.

[0204] <Note> The embodiments described above can also be further described as follows (see addendum).

[0205] (Note 1) A receiving unit that receives control information and data from the base station, A control unit that determines the carrier to transmit the uplink control channel based on the control information, The carrier determined above includes a transmitting unit that transmits information relating to the retransmission control of the data to the base station via the uplink control channel, The control unit is a terminal that sets the timing for when the determined carrier is activated and when it is deactivated.

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

[0207] (Note 3) The terminal described in Appendix 1, wherein the transmitting unit transmits information relating to the retransmission control of the data to the base station via the uplink control channel using power control parameters applied to the carrier instructed by the control information.

[0208] (Note 4) The terminal described in Appendix 1, wherein the control unit resets the cumulative value of the TPC (Transmission Power Control) command applied to the uplink control channel when the transmitting carrier is instructed to use the uplink control channel by the control information.

[0209] (Note 5) The control unit, when the transmitting carrier is instructed to use the uplink control channel by the control information, switches the closed-loop power control parameters relating to the spatial relationship applied to the uplink control channel, as described in Appendix 1.

[0210] (Note 6) A receiving procedure for receiving control information and data from a base station, A control procedure for determining the carrier to transmit the uplink control channel based on the control information, A transmission procedure comprising transmitting information relating to the retransmission control of the data to the base station via the uplink control channel in the carrier determined above, A communication method in which a terminal performs a procedure for setting the timing at which the determined carrier is activated and the timing at which it is deactivated. [Explanation of symbols]

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

Claims

1. A receiving unit that receives RRC (Radio Resource Control) signaling and PDSCH (Physical Downlink Shared Channel) from a base station, which specify a cell different from the primary cell as the destination cell for PUCCH (Physical Uplink Control Channel), and whose subcarrier interval is different from that of the primary cell. A control unit that determines a cell different from the primary cell as the destination cell for the PUCCH based on the RRC signaling, The system includes a transmitting unit that transmits information related to retransmission control corresponding to the PDSCH to the base station from the 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 the transmission power control of the cell to which the PUCCH is transmitted.

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

3. A communication system having terminals and base stations, The aforementioned terminal is A receiving unit that receives RRC (Radio Resource Control) signaling and PDSCH (Physical Downlink Shared Channel) from the base station, which specify a cell different from the primary cell as the destination cell for PUCCH (Physical Uplink Control Channel), and whose subcarrier interval is different from that of the primary cell. A control unit that determines a cell different from the primary cell as the destination cell for the PUCCH based on the RRC signaling, The system includes a transmitting unit that transmits information related to retransmission control corresponding to the PDSCH to the base station from the destination cell of the PUCCH, The control unit maintains a cumulative value of closed-loop power control for each cell in the transmission power control of the cell to which the PUCCH is transmitted. The aforementioned base station is A transmission unit that transmits the RRC signaling and the PDSCH to the terminal, A communication system having a control unit that, based on the RRC signaling, assumes a cell different from the primary cell as the receiving cell for the PUCCH.

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

Images