Terminal, base station, wireless communication method and wireless communication system

Abstract

This terminal (20) comprises: a control unit (203) that determines the granularity of an object for which the control of switching carriers for transmitting an uplink control channel is to be supported; and a transmission unit (202) that transmits the uplink control channel under the control of switching the carriers for the object in accordance with the determined granularity.

Description

[Technical Field]

[0001] The present disclosure relates to a terminal , base station, Wireless communication method and wireless communication systems Regarding. [Background technology]

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

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

[0004] [Non-Patent Document 1] 3GPP TS38.300 V16.4.0(2020-12) [Non-patent document 2] 3GPP TSG RAN Meeting #88e, RP-201310, Electronic meeting, June 29-July 3,2020 Summary of the Invention

[0005] There is room for further study to clarify the targets for which switching control of carriers transmitting uplink control channels is supported.

[0006] One aspect of the present disclosure is a terminal that can clarify a target that supports carrier switching control for transmitting an uplink control channel. , base station, Wireless communication method and wireless communication systems to provide.

[0007] A terminal according to one aspect of the present disclosure includes a control unit that determines the granularity of targets that support carrier switching control for transmitting an uplink control channel, and a transmission unit that transmits the uplink control channel under carrier switching control for the targets according to the determined granularity.

[0008] In a wireless communication method according to one aspect of the present disclosure, a terminal determines the granularity of targets that support carrier switching control for transmitting an uplink control channel, and transmits the uplink control channel under the carrier switching control for the targets according to the determined granularity. [Effects of the Invention]

[0009] According to one aspect of the present disclosure, it is possible to clarify targets for which switching control of carriers transmitting uplink control channels is supported. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram illustrating an example of a wireless communication system according to an embodiment. [Figure 2] FIG. 1 is a diagram illustrating an example of dual connectivity. [Figure 3]FIG. 10 is a diagram illustrating an example of PUCCH carrier switching. [Figure 4] FIG. 2 is a block diagram illustrating an example of a configuration of a base station according to an embodiment. [Figure 5] FIG. 2 is a block diagram illustrating an example of a configuration of a terminal according to an embodiment. [Figure 6] FIG. 2 is a diagram illustrating an example of a hardware configuration of a base station and a terminal according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] (System Configuration) Fig. 1 is a diagram for explaining a wireless communication system according to an embodiment. As shown in Fig. 1, the wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of base stations 10 and / or a plurality of terminals 20.

[0012] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain, and the time domain may be defined by the number of OFDM symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. Furthermore, a TTI (Transmission Time Interval) in the time domain may be a slot, or a TTI may be a subframe.

[0013] Base station 10 is capable of performing carrier aggregation, which aggregates multiple cells (for example, multiple CCs (component carriers)) to communicate with terminal 20. In carrier aggregation, one PCell (primary cell) and one or multiple SCells (secondary cells) are used.

[0014] The base station 10 transmits a synchronization signal, system information, and the like to the terminal 20. The synchronization signal is, for example, a PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal).

[0015] The system information is transmitted, for example, on a PBCH (Physical Broadcast Channel) or a PDSCH (Physical Downlink Shared Channel), and is also referred to as broadcast information. As shown in Fig. 1, a base station 10 transmits control signals or data to a terminal 20 in a DL (Downlink) and receives control signals or data from the terminal 20 in an UL (Uplink).

[0016] Here, signals transmitted via control channels such as PUCCH (Physical Uplink Control Channel) and PDCCH (Physical Downlink Control Channel) are referred to as control signals, and signals transmitted via shared channels such as PUSCH (Physical Uplink Shared Channel) and PDSCH are referred to as data, but these names are merely examples, and other names may also be used.

[0017] The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, or an M2M (Machine-to-Machine) communication module. As shown in Fig. 1, the terminal 20 receives control signals or data from the base station 10 in DL and transmits control signals or data to the base station 10 in UL, thereby utilizing various communication services provided by the wireless communication system. The terminal 20 may also be called UE (User Equipment), and the NR (New Radio) base station 10 may also be called gNB.

[0018] Terminal 20 is capable of performing carrier aggregation (CA) that aggregates multiple cells (multiple CCs (component carriers)) to communicate with base station 10. In CA, one PCell (primary cell) and one or more SCells (secondary cells) are used. Also, a PUCCH-SCell having a PUCCH may be used.

[0019] Fig. 2 shows an example of the configuration of a wireless communication system when DC (Dual connectivity) is implemented. As shown in Fig. 2, a base station 10-1 serving as an MN (Master Node) and a base station 10-2 serving as an SN (Secondary Node) are provided. The base stations 10-1 and 10-2 are connected to, for example, a core network. A terminal 20 can communicate with both the base station 10-1 and the base station 10-2.

[0020] A cell group provided by base station 10-1, which is an MN, may be called an MCG (Master Cell Group), and a cell group provided by base station 10-2, which is an SN, may be called an SCG (Secondary Cell Group). In DC, an MCG is configured, for example, by one PCell and one or more SCells. An SCG is configured, for example, by one PSCell (Primary SCell) and one or more SCells. As shown in the example of Figure 2, in DC, carriers between different base stations are aggregated.

[0021] 2, the base station 10-1 communicates with the terminal 20 via a primary cell (PCell) and a secondary cell (SCell). In the example of Fig. 2, the terminal 20 establishes an RRC (Radio Resource Control) connection with the base station 10-1.

[0022] In the case of DC, since there is a large delay in communication between base station 10-1 and base station 10-2, it may be difficult to notify uplink control information (e.g., UCI) received on the PCell of base station 10-1 to base station 10-2 in real time via a backhaul link and reflect it in the scheduling of the SCell under base station 10-2.

[0023] Therefore, in DC, for example, in addition to the PCell of base station 10-1, one carrier under base station 10-2 is set as a Primary SCell (PSCell) and PUCCH transmission is supported in the PSCell. Therefore, as shown in the example of Fig. 3, terminal 20 transmits UCI to base station 10-2 via the PSCell.

[0024] In the example of Fig. 2, an SCell is configured in addition to a PCell for base station 10-1. Also, an SCell is configured in addition to a PSCell for base station 10-2. Terminal 20 transmits UCI of each carrier under the control of base station 10-1 on the PUCCH of the PCell. Also, terminal 20 transmits UCI of each carrier under the control of base station 10-2 on the PUCCH of the PSCell.

[0025] When DC is being performed, terminal 20 transmits PUCCH via PCell, PSCell, and / or PUCCH-SCell. It is not expected that terminal 20 transmits PUCCH via SCell other than PCell, PSCell, and PUCCH-SCell.

[0026] Regarding the extension of URLLC technology in 3GPP Release 17, "PUCCH carrier switching" is being considered. "Switching" may be interchangeably read as "switching," "changing," or "selecting."

[0027] "PUCCH carrier switching" is being considered as a method to reduce the latency of Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) feedback in the Time Division Duplex (TDD) system.

[0028] Fig. 3 is a diagram showing an example of "PUCCH carrier switching." In the example of Fig. 3, base station 10 and terminal 20 communicate via cell #1 (cell 1) and cell #2 (cell 2). In the example of Fig. 3, cell #1 is a PCell, and cell #2 is an SCell.

[0029] 3, terminal 20 receives data (for example, receives PDSCH) at timing S101. Terminal 20 attempts to transmit an acknowledgement signal (for example, HARQ-ACK) for the data received at timing S101 at timing S102.

[0030] Here, at the timing of S102, the slot of cell #1 is set to DL. Therefore, when terminal 20 transmits HARQ-ACK in cell #1, the transmission of HARQ-ACK is suspended until an opportunity to transmit PUCCH in an UL slot (for example, the timing of S103 in FIG. 3) arrives. This may increase the latency of HARQ-ACK transmission.

[0031] 3, the slot of cell #2 is set to UL at timing S102. If terminal 20 can transmit HARQ-ACK for the data received at S101 in this UL slot, the latency of HARQ-ACK transmission can be reduced. Since URLLC requires low latency in the wireless section, "PUCCH carrier switching," in which terminal 20 switches the carrier used for PUCCH transmission, is being considered as an extension of URLLC technology.

[0032] In the following description, "the same timing" may mean the exact same timing, or may mean that all or part of a time resource (for example, one or more symbols (which may be a resource with a time unit shorter than a symbol)) is the same or overlaps.

[0033] "PUCCH carrier switching" may mean that when terminal 20 attempts to transmit PUCCH at a specific transmission timing of PCell (which may be PSCell or PUCCH-SCell), and the slot of the specific transmission timing of PCell (which may be PSCell or PUCCH-SCell) is a DL slot, terminal 20 switches the cell from which PUCCH is transmitted to one of one or more SCells (in the case of a PSCell, a SCell other than the PSCell, and in the case of a PUCCH-SCell, a SCell other than the PUCCH-SCell) in which the slot of the same timing as the specific transmission timing is a UL slot).

[0034] The unit of the specific transmission timing is not limited to a slot. For example, the specific transmission timing may be based on a time interval longer than a "slot" (e.g., a subframe), or may be based on a time interval shorter than a "slot" (e.g., a subslot or a symbol). A subslot may be composed of, for example, two symbols or seven symbols.

[0035] Two methods are considered for "PUCCH carrier switching." The first method is a method in which base station 10 dynamically instructs terminal 20 on the carrier for PUCCH transmission. "Instruction" may be read as "notification."

[0036] The second method is a method in which base station 10 semi-statically configures a carrier for PUCCH transmission for terminal 20. Note that in the following embodiments, "PUCCH transmission" may refer to transmitting uplink control information (e.g., UCI) via PUCCH.

[0037] Here, there is room for further study on how to enable and disable dynamic or semi-static PUCCH carrier switching.

[0038] For example, regarding support for PUCCH carrier switching, there is room for consideration of the granularity (or support level) as exemplified below.

[0039] ·Whether PUCCH carrier switching is based on only one of the two-level priorities (high priority (HP) and low priority (LP)) of UCI or PUCCH, or on both priorities.

[0040] · On what UCI type (e.g., HARQ-ACK, Scheduling Request (SR), Channel State Information (CSI) feedback, etc.) is the PUCCH carrier switching based?

[0041] Is PUCCH carrier switching defined in the standard or subject to enable / disable instructions?

[0042] · Whether dynamic PUCCH carrier switching and semi-static PUCCH carrier switching are enabled or disabled together (jointly) or separately (separately). ·Is there any difference between enabled PUCCH SCells in dynamic PUCCH carrier switching and semi-static PUCCH carrier switching?

[0043] <Proposal 1> The granularity of supporting PUCCH carrier switching will be described below.

[0044] (Option 1) Overall definition PUCCH carrier switching for information relating to which PUCCH (e.g., which priority and / or which UCI type of PUCCH) may be supported. For example, PUCCH carrier switching may be supported uniformly (or collectively) regardless of whether the UCI type is the same, whether the PUCCH priority is the same, or whether the UCI type and the PUCCH priority are the same.

[0045] (Option 2) One level of PUCCH carrier switching based on information about the PUCCH (UCI or PUCCH priority, or UCI type) may be supported. For example, PUCCH carrier switching for a PUCCH with specific PUCCH information may be supported. PUCCH carrier switching for a PUCCH with a specific priority (one or more priorities) or a PUCCH on which UCI of a specific type (one or more types) is transmitted may be supported.

[0046] The "information regarding a specific PUCCH," "specific PUCCH priority," or "specific UCI type" may be defined in a standard or may be determined in the terminal 20 based on an instruction from the base station 10 regarding enabling or disabling PUCCH carrier switching.

[0047] (Option 3) Two-level PUCCH carrier switching based on a combination of information about multiple PUCCHs (e.g., UCI or PUCCH priority and UCI type) may be supported. For example, PUCCH carrier switching may be supported for PUCCHs of a specific UCI type with specific PUCCH priority(s).

[0048] The "specific PUCCH priority" or the "specific UCI type" may be defined in a standard, or may be determined in the terminal 20 based on an instruction from the base station 10 regarding enabling or disabling PUCCH carrier switching.

[0049] It should be noted that, for example, different options may be used for different PUCCH carrier switching methods.

[0050] Example 1: Option 1 for dynamic PUCCH carrier switching For example, dynamic PUCCH carrier switching may be supported for both any priority or any UCI type.

[0051] Example 2: Option 3 for semi-static PUCCH carrier switching For example, semi-static PUCCH carrier switching may be supported for two levels of priority (eg, HARQ-ACK for High Priority (HP) Semi-Persistent Scheduling (SPS)).

[0052] <Proposal 2> Next, enabling and disabling dynamic and / or semi-static PUCCH carrier switching will be described.

[0053] (How to enable and disable) Alt. 1: Implicit indication Whether to enable or disable dynamic and / or semi-static PUCCH carrier switching may be determined, for example, by whether configuration information regarding PUCCH (e.g., PUCCH-Config, which is an example of an upper layer parameter) is configured for Scells other than Pcell, PScell, and PUCCH-Scell.

[0054] Alt. 2: Explicit signaling Whether to enable or disable dynamic and / or semi-static PUCCH carrier switching may be determined, for example, by an RRC parameter setting (e.g., the RRC parameter PucchCarrierSwitchingEnabled-r17) and / or a dynamic indication (e.g., a DCI or a MAC CE), where MAC CE is an abbreviation for "medium access control (MAC)-control element".

[0055] <Detailed example of Proposal 2> (enabled and disabled by explicit signaling) The enabling or disabling of dynamic PUCCH carrier switching and semi-static PUCCH carrier switching may be performed separately or jointly.

[0056] (Option 1) Enabling or disabling dynamic PUCCH carrier switching and semi-static PUCCH carrier switching may be performed by separate signaling.

[0057] The signaling methods for dynamic PUCCH carrier switching and semi-static PUCCH carrier switching may be the same or different.

[0058] Separate RRC parameters or dynamic indications (eg, DCI or MACCE) may be used to enable or disable dynamic PUCCH carrier switching and semi-static PUCCH carrier switching, respectively.

[0059] It should be noted that if both dynamic PUCCH carrier switching and semi-static PUCCH carrier switching are enabled according to their respective signaling, but simultaneous activation of dynamic PUCCH carrier switching and semi-static PUCCH carrier switching is not supported, one of the following options may be applied:

[0060] Opt. 1: Treat as an error case. Opt 2: The PUCCH carrier switching method that is enabled later is enabled, and other methods are disabled. Opt. 3: Enable dynamic carrier switching and disable semi-static carrier switching. Opt. 4: Enables semi-static carrier switching and disables dynamic carrier switching.

[0061] Examples 1 and 2 are shown below. Example 1: Dynamic PUCCH carrier switching may be enabled or disabled by a higher layer parameter (e.g., RRC parameter DynamicPucchCarrierSwitchingEnabled-r17). Semi-static PUCCH carrier switching may be enabled or disabled, for example, by a higher layer parameter (e.g., RRC parameter SemiStaticPucchCarrierSwitchingEnabled-r17).

[0062] Example 2: Dynamic PUCCH carrier switching is enabled or disabled by a higher layer parameter (e.g., RRC parameter DynamicPucchCarrierSwitchingEnabled-r17). Semi-static PUCCH carrier switching is enabled or disabled by a dynamic indication (e.g., DCI or MACCE).

[0063] (Option 2) Dynamic PUCCH carrier switching and / or semi-static PUCCH carrier switching may be jointly enabled or disabled. For example, dynamic PUCCH carrier switching and semi-static PUCCH carrier switching may be jointly (or simultaneously) enabled or disabled by configuring higher layer parameters (e.g., RRC parameters) or by dynamic instructions.

[0064] Based on Option 1 or Option 2 described above, cell-specific or cell group (e.g., CCs associated with the same SpCell and / or PUCCH-Scell) are considered as one cell group) specific signaling may be used.

[0065] (for cell group specific signaling) For example, higher layer parameters (e.g., RRC parameters, if any) and / or dynamic indications (if any) may be commonly applied to any possible PUCCH cells in a cell group. For example, higher layer parameters (e.g., RRC parameters, if any) and / or dynamic indications (if any) may apply to enable or disable dynamic PUCCH carrier switching and / or semi-static PUCCH carrier switching. If PUCCH carrier switching is enabled, the PUCCH is allowed to be switched to any possible PUCCH cell in a cell group.

[0066] (for cell-specific signaling) The target of the cell-specific signaling is to indicate the valid PUCCH cell(s) for PUCCH with PUCCH carrier switching. The valid cells may be the same or different for dynamic and semi-static PUCCH carrier switching.

[0067] Higher layer parameters (e.g., RRC parameters, if any) may be configured for each PUCCH Scell ​​or for a set of PUCCH Scells, respectively. For example, the RRC parameter DynamicPucchCarrierSwitchingEnabled-r17 corresponding to cell #1 may be used to enable PUCCH switched to cell #1 by dynamic switching. The dynamic indication, if any, may indicate, for example, that PUCCH is allowed to be switched to specific PUCCH Scell(s).

[0068] (enabled or disabled by explicit signaling) The design of enable or disable signaling can be combined with the granularity considerations shown in any of Options 1-3 of Proposal 1. Examples 1 and 2 are shown below.

[0069] Example 1: The granularity of priority levels may be further considered based on separate signaling for enabling or disabling dynamic PUCCH carrier switching and semi-static PUCCH carrier switching.

[0070] For example, a higher layer parameter corresponding to cell #1 (e.g., RRC parameter HpDymanicationPucchCarrierSwitchingEnabled-r17) may be used to enable dynamic PUCCH carrier switching for the HP PUCCH for cell #1, and a higher layer parameter corresponding to cell #2 (e.g., RRC parameter LpSemiStaticPucchCarrierSwitchingEnabled-r17) may be used to enable semi-static PUCCH carrier switching for the LP PUCCH for cell #2.

[0071] Example 2: Priority and UCI type level granularity may be further considered based on joint enabling or disabling of dynamic PUCCH carrier switching and semi-static PUCCH carrier switching.

[0072] For example, a higher layer parameter (e.g., RRC parameter LpHarqDinamicPucchCarrierSwitchingEnabled-r17) may be used to enable or disable dynamic PUCCH carrier switching for LP HARQ-ACK. A higher layer parameter (e.g., RRC parameter HpSRSemiStaticPucchCarrierSwitchingEnabled-r17) may be used to enable or disable semi-static PUCCH carrier switching for HP Scheduling Request (SR).

[0073] <Variations> Which proposal and option to use from the above-mentioned Proposal 1 (including various options) and Proposal 2 (including various options) may be set in the terminal 20 by upper layer parameters, may be determined by the terminal 20 reporting terminal capability information (UE capability(ies)) to the base station 10, may be described in a standard, or may be determined based on the setting of upper layer parameters and the reported terminal capability information.

[0074] <UE capability> As an example of the terminal capability information regarding PUCCH carrier switching, one or more of the following may be defined: (1) Whether the terminal 20 supports PUCCH carrier switching (2) Whether the terminal 20 supports dynamic PUCCH carrier switching (3) Whether the terminal 20 supports semi-static PUCCH carrier switching (4) Whether the terminal 20 supports PUCCH carrier switching for all UCI types or a specific UCI type (5) Whether the terminal 20 supports PUCCH carrier switching for both two levels of priority or for one specific priority. (6) Whether the terminal 20 supports enabling or disabling dynamic PUCCH carrier switching and semi-static PUCCH carrier switching together. (7) Whether the terminal 20 supports enabling or disabling dynamic PUCCH carrier switching and semi-static PUCCH carrier switching separately. (8) Whether the terminal 20 supports different enabled PUCCH carriers for dynamic PUCCH carrier switching and semi-static PUCCH carrier switching.

[0075] After transmitting, for example, any one or more pieces of terminal capability information (1) to (8) to the base station 10, the terminal 20 may perform an operation according to the transmitted terminal capability information. For example, by transmitting the terminal capability information (1), the terminal 20 may perform a PUCCH carrier switch in accordance with option 1 of proposal 1. Furthermore, by transmitting the terminal capability information (4) and (5), for example, the terminal 20 may perform a PUCCH carrier switch in accordance with option 3 of proposal 1. Furthermore, by transmitting any one or more pieces of terminal capability information (2), (3), (6), (7), and (8), the terminal 20 may perform a PUCCH carrier switch by, for example, any of the methods exemplified in proposal 2.

[0076] 1 may be a wireless communication system that conforms to (or is compliant with) a system called 5G, Beyond 5G, 5G Evolution, or 6G. Also, the wireless communication system may be a system of a generation later than 6G.

[0077] The base station 10 may be called an NG-RAN Node, ng-eNB, eNodeB (eNB), or gNodeB (gNB). The terminal 20 may be called User Equipment (UE). The base station 10 may also be considered as a device included in a network to which the terminal 20 is connected.

[0078] The base station 10 performs wireless communication with the terminal 20. For example, the performed wireless communication complies with NR. At least one of the base station 10 and the terminal 20 may support Massive MIMO (Multiple-Input Multiple-Output), which generates a more highly directional beam (BM) by controlling radio signals transmitted from multiple antenna elements. Furthermore, at least one of the base station 10 and the terminal 20 may support Carrier Aggregation (CA), which aggregates and uses multiple component carriers (CC). Furthermore, at least one of the base station 10 and the terminal 20 may support Dual Connectivity (DC), which performs communication between the terminal 20 and each of multiple base stations 10.

[0079] The wireless communication system may support multiple frequency bands. For example, the wireless communication system supports Frequency Range (FR) 1 and FR2. The frequency bands of each FR are, for example, as follows: FR1: 410MHz~7.125GHz FR2: 24.25GHz~52.6GHz

[0080] FR1 may use a Sub-Carrier Spacing (SCS) of 15 kHz, 30 kHz, or 60 kHz, and may use a bandwidth (BW) of 5 MHz to 100 MHz. FR2, for example, is a higher frequency than FR1. FR2 may use an SCS of 60 kHz or 120 kHz, and may use a bandwidth (BW) of 50 MHz to 400 MHz. FR2 may also include an SCS of 240 kHz.

[0081] The wireless communication system according to the present embodiment may support a frequency band higher than the FR2 frequency band. For example, the wireless communication system 10 according to the present embodiment may support a frequency band exceeding 52.6 GHz up to 114.25 GHz. Such a high frequency band may be referred to as "FR2x."

[0082] Alternatively, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) having a larger Sub-Carrier Spacing (SCS) than the above-mentioned example may be applied. Furthermore, DFT-S-OFDM may be applied to both the uplink and the downlink, or to either one of them.

[0083] In a wireless communication system, a TDD slot configuration pattern may be set. For example, DDDSU (D: Downlink (DL) symbol, S: DL / Uplink (UL) or guard symbol, U: UL symbol) may be specified (see 3GPP TS38.101-4).

[0084] Furthermore, in the wireless communication system 10, PUSCH (or PUCCH) channel estimation can be performed using a demodulation reference signal (DMRS) for each slot, and further, PUSCH (or PUCCH) channel estimation can be performed using DMRSs allocated to multiple slots, respectively. Such channel estimation may be called joint channel estimation, or may be called by another name such as cross-slot channel estimation.

[0085] The terminal 20 may transmit a DMRS allocated to (spanning) multiple slots so that the base station 10 can perform joint channel estimation using the DMRS.

[0086] Furthermore, in the wireless communication system, an enhanced (or extended) function may be added to the feedback function from the terminal 20 to the base station 10. For example, an enhanced (or extended) function of the terminal's feedback for HARQ-ACK and an enhanced function of CSI feedback for more accurate MCS selection may be added.

[0087] Next, the configurations of the base station 10 and the terminal 20 will be described. Note that the configurations of the base station 10 and the terminal 20 described below are examples of functions related to this embodiment. The base station 10 and the terminal 20 may have functions not shown. Furthermore, the functional divisions and / or names of the functional units are not limited as long as the functions perform the operations related to this embodiment.

[0088] <Base station configuration> 6 is a block diagram showing an example of the configuration of base station 10 according to this embodiment. Base station 10 may include, for example, a transmitting unit 101, a receiving unit 102, and a control unit 103. Base station 10 communicates with terminal 20 wirelessly.

[0089] The transmitter 101 transmits a downlink (DL) signal to the terminal 200. For example, the transmitter 101 transmits the DL signal under the control of the controller 103.

[0090] The DL signal may include, for example, a downlink data signal and control information (e.g., Downlink Control Information (DCI)). The DL signal may also include information indicating scheduling related to signal transmission of terminal 200 (e.g., an UL grant). The DL signal may also include control information of higher layers (e.g., control information of Radio Resource Control (RRC)). The DL signal may also include a reference signal.

[0091] Channels used for transmitting DL signals include, for example, data channels and control channels. For example, the data channels may include a PDSCH (Physical Downlink Shared Channel), and the control channels may include a PDCCH (Physical Downlink Control Channel). For example, the base station 10 transmits control information to the terminal 20 using the PDCCH and transmits downlink data signals using the PDSCH.

[0092] The reference signal included in the DL signal may include at least one of a demodulation reference signal (Demodulation Reference Signal (DMRS)), a Phase Tracking Reference Signal (PTRS), a Channel State Information-Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), and a Positioning Reference Signal (PRS) for position information. For example, reference signals such as DMRS and PTRS are used for demodulating downlink data signals and are transmitted using the PDSCH.

[0093] The receiver 102 receives an uplink (UL) signal transmitted from the terminal 200. For example, the receiver 102 receives the UL signal under the control of the controller 103.

[0094] The control unit 103 controls the communication operations of the base station 10, including the transmission processing of the transmission unit 101 and the reception processing of the reception unit .

[0095] For example, the control unit 103 acquires information such as data and control information from the upper layer and outputs it to the transmitting unit 101. The control unit 103 also outputs the data, control information, etc. received from the receiving unit 102 to the upper layer.

[0096] For example, control unit 103 allocates resources (or channels) used for transmitting and receiving DL signals and / or resources used for transmitting and receiving UL signals. Information on the allocated resources may be included in control information transmitted to terminal 200.

[0097] As an example of allocation of resources used for transmitting and receiving UL signals, control section 103 may configure multiple PUCCH resource sets. Information about the configured multiple PUCCH resource sets may be reported to terminal 200 by RRC.

[0098] Furthermore, the control unit 103 may set or control the terminal 20 to enable or disable "PUCCH carrier switching" based on, for example, Proposal 1 or Proposal 2 regarding "PUCCH carrier switching" described above.

[0099] <Device configuration> 5 is a block diagram showing an example of the configuration of terminal 20 according to this embodiment. Terminal 20 may include, for example, a receiving unit 201, a transmitting unit 202, and a control unit 203. Terminal 20 communicates with base station 10, for example, wirelessly.

[0100] The receiving unit 201 receives a DL signal transmitted from the base station 10. For example, the receiving unit 201 receives the DL signal under the control of the control unit 203.

[0101] The transmitter 202 transmits the UL signal to the base station 10. For example, the transmitter 202 transmits the UL signal under the control of the controller 203.

[0102] The UL signal may include, for example, an uplink data signal and control information (e.g., UCI). For example, information related to the processing capability of the terminal 20 (e.g., UE capability) may be included. The UL signal may also include a reference signal.

[0103] The channels used to transmit UL signals include, for example, a data channel and a control channel. For example, the data channel may include a PUSCH, and the control channel may include a PUCCH. For example, the terminal 20 receives control information from the base station 10 using the PUCCH and transmits UL data signals using the PUSCH.

[0104] The UL signal may include at least one reference signal of, for example, DMRS, PTRS (Phase-Tracking Reference Signal), CSI-RS, SRS (Sounding Reference Signal), and PRS (Positioning Reference Signal). For example, reference signals such as DMRS and PTRS are used for demodulating uplink data signals and are transmitted using PUSCH.

[0105] The control unit 203 controls the communication operations of the terminal 20, including the reception processing in the reception unit 201 and the transmission processing in the transmission unit 202.

[0106] For example, the control unit 203 acquires information such as data and control information from a higher layer and outputs it to the transmitting unit 202. Also, the control unit 203 outputs, for example, data and control information received from the receiving unit 201 to the higher layer.

[0107] Note that the channel used for DL ​​transmission and the channel used for UL transmission are not limited to the above example. For example, the channel used for DL ​​transmission and the channel used for UL transmission may include a Random Access Channel (RACH) and a Physical Broadcast Channel (PBCH). The RACH may be used to transmit DCI including a Random Access Radio Network Temporary Identifier (RA-RNTI), for example.

[0108] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or multiple devices with software.

[0109] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocation, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0110] For example, a base station, a terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 10 is a diagram illustrating an example of the hardware configuration of a base station and a terminal according to an embodiment of the present disclosure. The above-described base station 100 and terminal 200 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0111] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of base station 100 and terminal 200 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0112] Each function in the base station 100 and the terminal 200 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and the memory 1002, causing the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0113] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 103 and control unit 203 may be realized by the processor 1001.

[0114] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The program used is a program that causes a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 103 of the base station 100 or the control unit 203 of the terminal 200 may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and similar implementations may be made for other functional blocks. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0115] The memory 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0116] Storage 1003 is a computer-readable recording medium, and may be composed of at least one of, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned storage medium may be, for example, a database, a server, or other appropriate medium including at least one of memory 1002 and storage 1003.

[0117] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitter 101, receiver 102, receiver 201, transmitter 202, etc. may be realized by the communication device 1004.

[0118] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0119] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0120] Furthermore, base station 100 and terminal 200 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

[0121] (Information notification, signaling) The notification of information is not limited to the aspects / embodiments described in the present disclosure and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, and broadcast information (Master Information Block (MIB) and System Information Block (SIB))), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0122] (Applicable system) Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark), IEEE 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or other appropriate systems, and next-generation systems extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G) may also be applied.

[0123] (Processing procedures, etc.) The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0124] (Base station operation) In the present disclosure, a specific operation described as being performed by a base station may be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and another network node other than the base station (for example, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station, a combination of multiple other network nodes (for example, an MME and an S-GW) may also be used.

[0125] (input / output direction) Information, etc. (See the "Information, Signals" section) can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It can also be input / output via multiple network nodes.

[0126] (Handling of input and output information, etc.) Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0127] (Judgment method) The determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0128] (software) Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0129] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0130] (information, signals) The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0131] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0132] ("System", "Network") As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0133] (parameter, channel name) Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or other corresponding information. For example, a radio resource may be indicated by an index.

[0134] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0135] (Base station (wireless base station)) In this disclosure, terms such as "base station (BS)," "radio 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.

[0136] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0137] (Terminal) In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0138] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0139] (Base station / Mobile station) At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, or the mobile body itself. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0140] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 200 may be configured to have the functions of the base station 100 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0141] Similarly, the term "terminal" in the present disclosure may be read as "base station." In this case, the base station 100 may be configured to have the functions of the terminal 200 described above.

[0142] (Term meaning and interpretation) As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0143] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0144] (reference signal) The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0145] (meaning "based on") As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0146] ("First", "Second") As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0147] (means) The "unit" in the configuration of each of the above devices may be replaced with "means," "circuit," "device," etc.

[0148] (open format) When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0149] (Time unit such as TTI, frequency unit such as RB, radio frame configuration) A radio frame may be composed of one or more frames in the time domain. Each of one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0150] Numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by a transceiver in the frequency domain, and specific windowing operations performed by a transceiver in the time domain.

[0151] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0152] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0153] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0154] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0155] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0156] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0157] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0158] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0159] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0160] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0161] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0162] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0163] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0164] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0165] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0166] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0167] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0168] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0169] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0170] (Variations of form, etc.) Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0171] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Industrial Applicability]

[0172] One aspect of the present disclosure is useful in wireless communication systems. [Explanation of symbols]

[0173] 10 base station 20 terminals 101,202 Transmitter 102,201 Receiver 103,203 Control unit

Claims

1. a receiving unit that receives first radio resource control (RRC) parameters and dynamic control information (DCI); a control unit that controls switching of a cell that transmits an uplink control channel based on a dynamic instruction in the DCI when the first RRC parameter is configured; Equipped with The control unit controls cell switching of the semi-static uplink control channel when second RRC parameters different from the first RRC parameters are set. Terminal.

2. a transmitter that transmits first radio resource control (RRC) parameters and dynamic control information (DCI); a receiving unit that receives an uplink control channel transmitted from a terminal that controls switching of a cell that transmits an uplink control channel based on a dynamic instruction in the DCI when the first RRC parameter is configured; Equipped with The receiving unit receives the uplink control channel transmitted from a terminal that controls cell switching of a semi-static uplink control channel when a second RRC parameter different from the first RRC parameter is set. Base station.

3. The device is receiving first radio resource control (RRC) parameters and dynamic control information (DCI); When the first RRC parameter is configured, controlling switching of a cell that transmits an uplink control channel based on a dynamic instruction in the DCI; When a second RRC parameter different from the first RRC parameter is configured, controlling cell switching of the semi-static uplink control channel. Wireless communication method.

4. a base station that transmits first radio resource control (RRC) parameters and dynamic control information (DCI); a receiving unit that receives the first RRC parameter and the DCI; a control unit that controls switching of a cell that transmits an uplink control channel based on a dynamic instruction in the DCI when the first RRC parameter is set, and controls switching of a cell that transmits the semi-static uplink control channel when a second RRC parameter different from the first RRC parameter is set; and a terminal comprising: A wireless communication system having:

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