Terminal and wireless communication method

Abstract

To provide a terminal and a wireless communication method capable of transmitting an uplink control channel (PUCCH) that is adequately responsive to an increase in UCIs and the like.SOLUTION: In a wireless communication system, a terminal (UE) 200 includes a control unit 270 that sets demodulation reference signals for an uplink control channel, and a transmission unit 210 that transmits the demodulation reference signals. The control unit sets demodulation reference signals that are orthogonal in at least one of the time domain and the frequency domain, on the basis of configuration information for the uplink control channel.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a terminal and a wireless communication method for transmitting uplink control information. [Background technology]

[0002] The 3rd Generation Partnership Project (3GPP) has developed specifications for the 5th generation mobile communication system (5G, also known as New Radio (NR) or Next Generation (NG)), and is also developing specifications for the next generation, known as Beyond 5G, 5G Evolution, or 6G.

[0003] 3GPP Release 15 and Release 16 (NR) specify that a terminal (User Equipment, UE) transmits uplink control information (UCI) to a radio base station (gNB) via a PUCCH (Physical Uplink Control Channel) (Non-Patent Document 1). [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 38.212 V16.3.0, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Multiplexing and channel coding (Release 16), 3GPP, September 2020 Summary of the Invention

[0005] For example, the pursuit of accurate beam management and real-time performance increases the amount of Channel State Information-Reference Signal (CSI-RS) feedback, which in turn increases UCI. Therefore, a scheme that can transmit more UCI quickly is needed.

[0006] Therefore, the following disclosure has been made in consideration of such circumstances, and aims to provide a terminal and a wireless communication method capable of transmitting an uplink control channel (PUCCH) that can adequately accommodate an increase in UCI and the like.

[0007] One aspect of the present disclosure is a terminal (UE 200) that includes a transmitter (control signal / reference signal processor 240) that transmits demodulation reference signals for an uplink control channel, and a controller (controller 270) that controls the transmission of the demodulation reference signals, and the controller sets the demodulation reference signals to be orthogonal in at least one of the time domain and the frequency domain.

[0008] One aspect of the present disclosure is a wireless communication method including a step of transmitting a demodulation reference signal for an uplink control channel and a step of controlling the transmission of the demodulation reference signal, wherein in the controlling step, the demodulation reference signal is set to be orthogonal in at least one of the time domain and the frequency domain.

[0009] One aspect of the present disclosure is a terminal (UE) (UE200) that includes a control unit (control unit 270) that sets a demodulation reference signal for an uplink control channel, and a transmission unit (control signal / reference signal processing unit 240) that transmits the demodulation reference signal, and the control unit sets the demodulation reference signal that is orthogonal in at least either the time domain or the frequency domain based on configuration information for the uplink control channel.

[0010] One aspect of the present disclosure is a terminal (UE200) that includes a control unit (control unit 270) that sets an uplink control channel using at least one of precoding information for an uplink control channel and precoding information for an uplink data channel, and a transmission unit (control signal / reference signal processing unit 240) that transmits the set uplink control channel.

[0011] One aspect of the present disclosure is a terminal (UE200) that includes a receiving unit (control signal / reference signal processing unit 240) that receives configuration information for an uplink control channel, and a control unit (control unit 270) that sets multiple spatial relationships to be applied to the uplink control channel based on the configuration information.

[0012] One aspect of the present disclosure is a terminal (UE200) that includes a receiving unit (control signal / reference signal processing unit 240) that receives configuration information for an uplink control channel, and a control unit (control unit 270) that sets, based on the configuration information, at least one of precoding to be applied to the uplink control channel or a demodulation reference signal port for the uplink control channel.

[0013] One aspect of the present disclosure is a terminal (UE 200) that includes a receiving unit (control signal / reference signal processing unit 240) that receives downlink control information for a downlink data channel, and a control unit (control unit 270) that sets an uplink control channel in a specific transmission mode based on the downlink control information.

[0014] One aspect of the present disclosure is a wireless communication method including a step of setting a demodulation reference signal for an uplink control channel and a step of transmitting the demodulation reference signal, wherein in the setting step, the demodulation reference signal is set to be orthogonal in at least one of the time domain and the frequency domain based on setting information of the uplink control channel. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a diagram showing the overall schematic configuration of a wireless communication system 10. As shown in FIG. [Figure 2]FIG. 2 is a diagram showing an example of the configuration of a radio frame, a subframe, and a slot used in the radio communication system 10. As shown in FIG. [Figure 3] Figure 3 is a functional block diagram of gNB100 and UE200. [Figure 4] FIG. 4 is a diagram illustrating an example of an SRS supported by a UE. [Figure 5] FIG. 5 is a diagram showing an image of precoding and DMRS port designation. [Figure 6] FIG. 6 is a diagram showing a schematic operation sequence regarding MIMO transmission of PUCCH. [Figure 7] FIG. 7 is a diagram illustrating an example (part 1) of DMRS allocation according to the first operation example. [Figure 8] FIG. 8 is a diagram illustrating an example (part 2) of DMRS allocation according to the first operation example. [Figure 9] FIG. 9 is a diagram illustrating an example (part 3) of DMRS allocation according to the first operation example. [Figure 10] FIG. 10 is a diagram illustrating an example (part 1) of a mapping pattern of FD-OCC according to the first operation example. [Figure 11] FIG. 11 is a diagram illustrating a mapping pattern example (part 2) of FD-OCC according to the first operation example. [Figure 12] FIG. 12 is a diagram illustrating a mapping pattern example (part 3) of FD-OCC according to the first operation example. [Figure 13] FIG. 13 is a diagram illustrating an example (part 4) of DMRS allocation according to the first operation example. [Figure 14] FIG. 14 is a diagram illustrating an example (part 5) of DMRS allocation according to the first operation example. [Figure 15] FIG. 15 is a diagram illustrating an example of application of transform precoding to a DMRS for PUCCH according to the first operation example, and an example of the configuration of a PUCCH-Config information element. [Figure 16] FIG. 16 is a diagram illustrating an example (part 6) of DMRS allocation according to the first operation example. [Figure 17]FIG. 17 is a diagram illustrating an example (part 7) of DMRS allocation according to the first operation example. [Figure 18] FIG. 18 is a diagram illustrating an eighth example of DMRS allocation according to the first operation example. [Figure 19] FIG. 19 is a diagram illustrating an example (part 9) of DMRS allocation according to the first operation example. [Figure 20] FIG. 20 is a diagram illustrating an example (10) of DMRS allocation according to the first operation example. [Figure 21] FIG. 21 is a diagram illustrating an example of the configuration of a PUCCH-Config information element according to the first operation example. [Figure 22] FIG. 22 is a diagram illustrating a configuration example (part 1) of a PUCCH-Config information element according to the second operation example. [Figure 23] FIG. 23 is a diagram illustrating a configuration example (part 2) of a PUCCH-Config information element according to the second operation example. [Figure 24] FIG. 24 is a diagram showing an application example (part 1) of the TPMI table / Precoding table according to the third operation example. [Figure 25] FIG. 25 is a diagram showing an application example (part 2) of the TPMI table / Precoding table according to the third operation example. [Figure 26] FIG. 26 is a diagram illustrating a configuration example of a PUCCH-SpatialRelationInfo information element according to the fourth operation example. [Figure 27] FIG. 27 is a diagram illustrating a configuration example (part 1) of a MAC-CE according to the fifth operation example. [Figure 28] FIG. 28 is a diagram illustrating a configuration example (part 2) of a MAC-CE according to the fifth operation example. [Figure 29] FIG. 29 is a diagram illustrating a configuration example (part 1) of a MAC-CE according to the sixth operation example. [Figure 30] FIG. 30 is a diagram illustrating a second example of the configuration of a MAC-CE according to the sixth operation example. [Figure 31]FIG. 31 is a diagram illustrating a configuration example of SP CSI reporting on PUCCH activation / deactivation MAC-CE according to the seventh operation example. [Figure 32] FIG. 32 is a diagram illustrating the relationship between DCI, PDSCH, and PUCCH according to the eighth operation example. [Figure 33] FIG. 33 is a diagram illustrating the relationship between DCI, PDSCH, and PUCCH according to the ninth operation example. [Figure 34] FIG. 34 is a diagram showing an example of the hardware configuration of gNB100 and UE200. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments will be described with reference to the drawings. Note that the same or similar reference numerals are used to designate the same functions or configurations, and descriptions thereof will be omitted as appropriate.

[0017] (1) Overall configuration of the wireless communication system 1 is a diagram showing an overall schematic configuration of a wireless communication system 10 according to this embodiment. The wireless communication system 10 is, for example, a wireless communication system conforming to 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN 20) and a terminal 200 (User Equipment 200, hereinafter, UE 200).

[0018] The wireless communication system 10 may be a wireless communication system conforming to a scheme called Beyond 5G, 5G Evolution, or 6G, and in particular, may be compatible with 3GPP Release 18 or later releases.

[0019] The NG-RAN 20 includes a radio base station 100 (hereinafter, gNB 100). Note that the specific configuration of the radio communication system 10, including the number of gNBs and UEs, is not limited to the example shown in FIG.

[0020] The NG-RAN 20 actually includes multiple NG-RAN nodes, specifically, gNBs (or ng-eNBs), and is connected to a 5G-compliant core network (5GC, not shown). The NG-RAN 20 and the 5GC may also be simply referred to as a "network."

[0021] The gNB 100 is a radio base station that complies with NR and performs NR-compliant radio communication with the UE 200. The gNB 100 and the UE 200 are capable of supporting Massive MIMO, which generates a more directional beam (BM) by controlling radio signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which aggregates and uses multiple component carriers (CCs), and Dual Connectivity (DC), which simultaneously communicates between the UE and multiple NG-RAN nodes.

[0022] The wireless communication system 10 may support FR1 and FR2. The frequency bands of each FR (Frequency Range) are as follows:

[0023] FR1: 410 MHz to 7.125 GHz FR2: 24.25 GHz~52.6 GHz FR1 may use a Sub-Carrier Spacing (SCS) of 15, 30, or 60 kHz and a bandwidth (BW) of 5 to 100 MHz. FR2 is a higher frequency than FR1, and may use an SCS of 60 or 120 kHz (including 240 kHz) and a bandwidth (BW) of 50 to 400 MHz.

[0024] Furthermore, the wireless communication system 10 may also support frequency bands higher than the FR2 frequency band. Specifically, the wireless communication system 10 may support frequency bands above 52.6 GHz up to 114.25 GHz.

[0025] Alternatively, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) with a larger Sub-Carrier Spacing (SCS) may be applied. Furthermore, DFT-S-OFDM may be applied not only to the uplink (UL) but also to the downlink (DL).

[0026] FIG. 2 shows an example of the configuration of a radio frame, a subframe, and a slot used in the radio communication system 10. In FIG.

[0027] As shown in Figure 2, one slot consists of 14 symbols (OFDM symbols), and the larger (wider) the SCS, the shorter the symbol period (and slot period). Note that the number of symbols constituting one slot does not necessarily have to be 14 symbols (for example, 28 or 56 symbols). The number of slots per subframe may differ depending on the SCS. Furthermore, the SCS may be wider than 240 kHz (for example, 480 kHz or 960 kHz as shown in Figure 2).

[0028] 2 may be called a time domain, a symbol period, a symbol time, etc. The frequency direction may be called a frequency domain, a resource block, a subcarrier, a BWP (Bandwidth part), etc.

[0029] Furthermore, the above-mentioned Massive MIMO may be interpreted as a technology that, in a MIMO (Multiple-Input Multiple-Output) transmission method that spatially multiplexes and transmits radio signals by using multiple antenna elements for both transmission and reception, employs a super-multiple-element antenna consisting of more antenna elements to form sharp radio beams that enable compensation for radio wave propagation loss when using high frequency bands, and to realize the simultaneous transmission of more streams.

[0030] MIMO may include single-user MIMO (SU-MIMO) and multi-user MIMO (MU-MIMO). SU-MIMO is a technology that performs MIMO transmission for a single user at the same time and frequency, while MU-MIMO may be interpreted as a technology that transmits signals for multiple users using MIMO at the same time and frequency. MIMO may also be broadly referred to as spatial multiplexing, and multiple MIMO layers may be used. Some MIMO layers may be transmitted from a specific site, and other MIMO layers may be transmitted from other sites different from the specific site.

[0031] MIMO transmission (which may simply be referred to as MIMO) may be applied to a PDSCH (Physical Downlink Shared Channel) and a PUSCH (Physical Uplink Shared Channel), that is, to communications (data communications) via the PDSCH and the PUSCH. In addition, in the wireless communication system 10, MIMO transmission may be applied to a PUCCH (Physical Uplink Control Channel).

[0032] A plurality of formats may be defined for the PUCCH. For example, as defined in 3GPP TS38.211, chapter 6.3.2.1, formats 0 to 4 (not all of them may be defined) may be defined. For each format, the OFDM symbol length (number of symbols) and / or the number of bits may be set.

[0033] In this way, formats may be defined that differ in either the number of information bits transmitted by the PUCCH or the number of symbols (OFDM symbols) allocated to the PUCCH.

[0034] More specifically, PUCCH Formats (hereinafter referred to as PF) 1, 3, and 4 are called long formats, and have 4 to 14 symbols. PFs 0 and 2 are called short formats, and have 1 or 2 symbols.

[0035] The number of information bits of PF 0 and PF 1 is 2 bits or less (≧2), and the number of information bits of PF 2 to PF 4 is greater than 2 bits (>2).

[0036] The PUCCH may be referred to as an uplink control channel and may be used to transmit control signals in the uplink (UL). For example, the PUCCH may be used to transmit uplink control information (UCI).

[0037] The UCI may include at least one of an ACK / NACK of a Hybrid Automatic Repeat Request (HARQ), a Scheduling Request (SR) from the UE 200, and Channel State Information (CSI).

[0038] (2) Functional block configuration of wireless communication system Next, a functional block configuration of the wireless communication system 10 will be described. Specifically, a functional block configuration of the UE 200 will be described. FIG. 3 is a functional block configuration diagram of the gNB 100 and the UE 200.

[0039] As shown in FIG. 3, UE 200 includes a radio signal transmitting / receiving unit 210, an amplifier unit 220, a modulation / demodulation unit 230, a control signal / reference signal processing unit 240, an encoding / decoding unit 250, a data transmitting / receiving unit 260, and a control unit 270.

[0040] It should be noted that Fig. 3 shows only the main functional blocks relevant to the description of the embodiment, and that the UE 200 (gNB 100) has other functional blocks (e.g., a power supply unit, etc.). Fig. 3 shows the functional block configuration of the UE 200, and for the hardware configuration, please refer to Fig. 13.

[0041] The radio signal transmitting and receiving unit 210 transmits and receives radio signals conforming to NR. The radio signal transmitting and receiving unit 210 can support Massive MIMO, which generates a more directional beam by controlling radio (RF) signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which aggregates and uses multiple component carriers (CCs), and Dual Connectivity (DC), which simultaneously communicates between a UE and two NG-RAN nodes.

[0042] The amplifier unit 220 is configured by a PA (Power Amplifier) / LNA (Low Noise Amplifier), etc. The amplifier unit 220 amplifies the signal output from the modulation / demodulation unit 230 to a predetermined power level. The amplifier unit 220 also amplifies the RF signal output from the radio signal transmission / reception unit 210.

[0043] The modem unit 230 performs data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (e.g., gNB 100). The modem unit 230 may apply Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM). Furthermore, DFT-S-OFDM may be used not only for uplink (UL) but also for downlink (DL).

[0044] The control signal / reference signal processor 240 performs processing related to various control signals transmitted and received by the UE 200 and processing related to various reference signals transmitted and received by the UE 200 .

[0045] Specifically, the control signal / reference signal processor 240 receives various control signals, for example, control signals of a radio resource control layer (RRC), transmitted via a predetermined control channel from the gNB 100. The control signal / reference signal processor 240 also transmits various control signals to the gNB 100 via a predetermined control channel.

[0046] The control signal / reference signal processor 240 performs processing using reference signals (RS) such as a Demodulation Reference Signal (DMRS) and a Phase Tracking Reference Signal (PTRS).

[0047] DMRS is a reference signal (pilot signal) known between the base station and the terminal for estimating the fading channel used for data demodulation. PTRS is a terminal-specific reference signal for estimating phase noise, which is an issue in high frequency bands.

[0048] In addition to the DMRS and PTRS, the reference signals may include a Channel State Information-Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), and a Positioning Reference Signal (PRS) for position information.

[0049] The channels include a control channel and a data channel. The control channels may include a PDCCH (Physical Downlink Control Channel), a PUCCH (Physical Uplink Control Channel), a RACH (Random Access Channel, Downlink Control Information (DCI) including a Random Access Radio Network Temporary Identifier (RA-RNTI)), a Physical Broadcast Channel (PBCH), etc.

[0050] Furthermore, the data channel includes a PDSCH (Physical Downlink Shared Channel), a PUSCH (Physical Uplink Shared Channel), etc. Data may refer to data transmitted via a data channel.

[0051] As described above, the control signal and reference signal processor 240 can perform processing related to DMRS (demodulation reference signal), specifically, can transmit and / or receive DMRS for a specific purpose. In particular, in this embodiment, the control signal and reference signal processor 240 can transmit DMRS (demodulation reference signal) for PUCCH (uplink control channel). In this embodiment, the control signal and reference signal processor 240 may constitute a transmitter.

[0052] Here, the DMRS for PUCCH may be interpreted as a DMRS for supporting MIMO transmission in PUCCH. Furthermore, the DMRS may be orthogonal. Specifically, the DMRS may be orthogonal in at least one of the time domain and the frequency domain. Such a DMRS may be referred to as an orthogonal DMRS.

[0053] An orthogonal DMRS may be interpreted as a DMRS in a PUCCH format that is provided with orthogonality by applying (multiplying) an orthogonal cover code (OCC) pattern to the DMRS. In short, an orthogonal DMRS may be interpreted as a DMRS that is not co-located in the time domain or the frequency domain.

[0054] Furthermore, control signal and reference signal processing unit 240 may transmit a PUCCH configured using at least one of precoding information for the PUCCH and precoding information for a PUSCH (uplink data channel). The precoding information may be, for example, a precoding table (precoding matrix) specified in 3GPP TS38.211 Chapter 6.3.1.4 or a TPMI (Transmitted Precoding Matrix Indicator) table (precoding information and number of layers) specified in 3GPP TS38.212 Chapter 7.3.1.1.

[0055] The control signal and reference signal processor 240 can receive PUCCH configuration information. In this embodiment, the control signal and reference signal processor 240 may constitute a receiver. Specifically, the control signal and reference signal processor 240 may receive configuration information via signaling of a higher layer (e.g., RRC), more specifically, PUCCH configuration information (e.g., PUCCH-Config information element) via an RRC information element (IE).

[0056] Alternatively, the control signal and reference signal processor 240 may receive PUCCH configuration information from a control element (CE) of a medium access control layer (MAC).

[0057] The setting information may be anything related to the configuration of the PUCCH, and may include the radio resources to which the PUCCH is allocated, the DMRSport setting for the PUCCH, the PUCCH format, spatial relation, and the like.

[0058] Furthermore, control signal and reference signal processing unit 240 may receive DCI (downlink control information) as described above, but may also receive DCI for a PDSCH (downlink data channel). Specifically, control signal and reference signal processing unit 240 may receive DCI in accordance with a DCI format (e.g., format 1_0) specified in Chapter 7.3 of 3GPP TS38.212.

[0059] The encoding / decoding unit 250 performs data division / concatenation and channel coding / decoding for each predetermined communication destination (gNB100 or another gNB).

[0060] Specifically, the encoding / decoding unit 250 divides the data output from the data transmitting / receiving unit 260 into pieces of a predetermined size, performs channel coding on the divided data, decodes the data output from the modem unit 230, and concatenates the decoded data.

[0061] The data transmitter / receiver 260 transmits and receives Protocol Data Units (PDUs) and Service Data Units (SDUs). Specifically, the data transmitter / receiver 260 assembles and disassembles PDUs / SDUs in multiple layers (such as a Medium Access Control layer (MAC), a Radio Link Control layer (RLC), and a Packet Data Convergence Protocol layer (PDCP)). The data transmitter / receiver 260 also performs data error correction and retransmission control based on Hybrid Automatic Repeat Request (Hybrid ARQ).

[0062] The control unit 270 controls each functional block constituting the UE 200. In particular, in this embodiment, the control unit 270 can execute control to support MIMO transmission of the PUCCH (which may also be referred to as MIMO transmission).

[0063] Specifically, the control unit 270 can control signal transmission by the control signal / reference signal processing unit 240, in particular, transmission and setting of a DMRS. The control unit 270 can set a DMRS for the PUCCH.

[0064] For example, control unit 270 may configure DMRSs to be orthogonal in at least one of the time domain and the frequency domain.

[0065] A specific example of DMRS allocation will be described later, but control unit 270 may set DMRSs that are orthogonal to each other in either or both of the time domain (for example, slots) and the frequency domain (for example, subcarriers).

[0066] The DMRS arrangement may follow an existing PUCCH format (for example, PF 4) or a new PUCCH format having multiple DMRS ports.

[0067] The control unit 270 may set orthogonal DMRSs using an orthogonal cover code (OCC) pattern. The OCC pattern may be TD (Time Domain)-OCC (when orthogonality is imparted in the time domain) or FD (Frequency Domain)-OCC (when orthogonality is imparted in the frequency domain).

[0068] Control unit 270 may share the position of the DMRS for the PUSCH (uplink data channel) and the position of the DMRS for the PUCCH. Specifically, control unit 270 may share the allocation position of the DMRS for the PUSCH in the time domain and the frequency domain as the allocation position of the DMRS for the PUCCH. In other words, control unit 270 may also use the allocation position of the DMRS for the PUSCH as the allocation position of the DMRS for the PUCCH.

[0069] The control unit 270 may stop applying transform precoding to information transmitted via the PUCCH, specifically, to uplink control information (UCI), in a specific transmission format. The specific transmission format may be interpreted as MIMO transmission of the PUCCH, specifically MIMO transmission of the PUCCH according to a specific PUCCH format (e.g., PF 3 or 4). Transform precoding may also be interpreted as DFT-S-OFDM.

[0070] When transmitting a DMRS for PUCCH, control unit 270 may arrange symbols for the DMRS consecutively. Specific examples of DMRS arrangement will be described later, but control unit 270 may arrange DMRS symbols consecutively in the time domain, that is, consecutively with adjacent symbols. In this case, control unit 270 may arrange only one symbol per DMRS port.

[0071] The control unit 270 can configure orthogonal DMRSs in at least either the time domain or the frequency domain based on PUCCH configuration information. The PUCCH configuration information may be an RRC information element or MAC-CE, as described above. That is, the control unit 270 may configure orthogonal DMRSs for PUCCHs in accordance with signaling from the network.

[0072] Furthermore, the control unit 270 may configure at least one of the precoding applied to the PUCCH and the port of the DMRS (DMRSport) based on the configuration information of the PUCCH. Specifically, the control unit 270 may configure the precoding and / or the DMRS port of the PUCCH based on the precoding matrix or TPMI applied during MIMO transmission of the PUCCH.

[0073] Furthermore, control unit 270 may set a plurality of spatial relations to be applied to the PUCCH based on the PUCCH setting information. The spatial relation may be, for example, an extension of PUCCH-SpatialRelationInfo defined in 3GPP TS38.331. Specific examples of extensions of the spatial relation will be described later.

[0074] Control unit 270 may configure the PUCCH using at least one of precoding information for the PUCCH and precoding information for the PUSCH. As described above, the precoding information may be a precoding table (precoding matrix) or a TPMI table (precoding information and number of layers). An example of configuring the PUCCH using the precoding information will be described later.

[0075] Control unit 270 may configure the PUCCH in a specific transmission format based on DCI (downlink control information) for the PDSCH. The specific transmission format may be interpreted as, for example, a case where the PUCCH is transmitted using MIMO. Specifically, control unit 270 may configure the PUCCH for MIMO transmission in accordance with the configuration indicated by the DCI for the PDSCH (for example, format 1_0). A specific example of configuring the PUCCH using such DCI for the PDSCH will be described later.

[0076] (3) Operation of the wireless communication system Next, a description will be given of the operation of the wireless communication system 10. Specifically, a description will be given of the operation of the UE 200 mainly when transmitting the PUCCH, particularly when MIMO is applied to the PUCCH.

[0077] (3.1) Premise As described above, UCI is transmitted from UE200 to the network (gNB100) via PUCCH, but the amount of UCI may increase from the following perspectives.

[0078] Provides accurate CSI-RS feedback for precise beam management Frequent CSI-RS feedback for real-time operation - Increase in HARQ codebook size due to increase in the number of CCs in carrier aggregation (CA) Considering such a situation, communication using MIMO can improve frequency utilization efficiency (allowing for large amounts of data to be transmitted using fewer resources).

[0079] In this embodiment, MIMO transmission may also be applied to the PUCCH. Examples of information relating to MIMO transmission that needs to be notified to the UE 200 include the following.

[0080] Number of transmission layers UE Precoding specification (when using Codebook MIMO) -Specify the DMR Sport to use when sending -Specify the SRS to use 4 shows an example of SRS supported by the UE. As shown in FIG. 4, the number of transmission layers and the SRS may be specified for the UE 200. For example, the number of layers to be used for transmission and the SRS to be transmitted may be specified.

[0081] Furthermore, for MIMO transmission, it is necessary to secure orthogonal DMRS. Specifically, a DMRS port mapped to each transmission layer may be designated.

[0082] Figure 5 shows an image of precoding and DMRS port designation. As shown in Figure 5, precoding may be designated to adjust the phase and amplitude of each SRS. Here, SRS2 is designated for TRP1 (Tx / Rx Point), and SRS3 is designated for TRP2. SRS2 may be linked to DMRS port 1, and SRS3 may be linked to DMRS port 2. Note that TRP may refer to the antenna array (which may also be an antenna port or antenna element) on the network side, or in a broader sense, the gNB.

[0083] (3.2) Operation overview Fig. 6 shows a schematic operation sequence for MIMO transmission of PUCCH. As shown in Fig. 6, UE 200 measures the UL channel state (step 1). Specifically, UE 200 measures the rank number, channel quality, etc. UE 200 may transmit an SRS and transmit the measurement result as a CSI-report. Note that the rank may mean the transmission rank, and the rank number may be interpreted as the number of layers (spatial streams) simultaneously transmitted in MIMO.

[0084] Furthermore, the UE 200 may report capability information (UE capability) related to the PUCCH transmission of the UE 200 to the network.

[0085] The network (gNB100) notifies the UE200 of information required for MIMO transmission of PUCCH (which may also be referred to as PUCCH MIMO transmission) (step 2). Specifically, the network may notify the UE200 of the information by DCI or signaling of a higher layer (such as RRC). More specifically, the network may notify the UE200 of the designation of multiple SRSs to be used (in the case of non-codebook type), the designation of TPMI (in the case of codebook type), and the selection of DMRSport.

[0086] Based on the notified information, the UE 200 performs PUCCH MIMO transmission (step 3). Specifically, the UE 200 may transmit the PUCCH according to a specific format (PF) using multiple layers by MIMO.

[0087] (3.3) Example of operation Next, operation examples relating to MIMO transmission of PUCCH will be described. Specifically, operation examples 1 to 11 will be described.

[0088] (3.3.1) Operational Example 1: DMRS for PUCCH (3.3.1.1) Orthogonal DMRS placement To realize PUCCH MIMO transmission, orthogonal DMRSs are arranged. For example, multiple orthogonal DMRSs may be arranged by any of the following methods.

[0089] Specifically, an OCC pattern may be applied to the DMRS of the existing PUCCH format (PF) to provide orthogonality.

[0090] Fig. 7 shows an example (part 1) of DMRS allocation according to operation example 1. Specifically, Fig. 7 shows an example of DMRS allocation according to PFs 2, 3, and 4 (the thinly shaded areas indicate the positions of DMRS. Note that DMRS may also be written as DM-RS).

[0091] In this case, only the DMRSs may be orthogonalized in PFs 2, 3, and 4 used for transmitting UCI of 2 or more bits, which can improve frequency utilization efficiency.

[0092] In PF 4, since both UCI and DMRS can be multiplexed with FD-OCC, the DMRS OCC pattern for MIMO may be configured or scheduled so that the FD-OCC pattern is multiplexed.

[0093] Alternatively, a new PUCCH format (PF) having multiple DMRSports may be configured. In this case, the number of OFDM symbols, the number of Physical Resource Blocks (PRBs), the number of Start symbols, etc. may be configured when configuring the PF. In this case, the DMRS position of the PUSCH may be shared as the DMRS for the PUCCH.

[0094] Furthermore, when orthogonal DMRSs are arranged according to PF 2, orthogonality may be achieved by applying a TD-OCC pattern or FD-OCC pattern to the DMRSs of PF 2. Specifically, orthogonality may be ensured by using one of the following methods, or by combining both:

[0095] Orthogonality in the time domain: TD-OCC allows DMRS to be arranged orthogonally or in a comb-like pattern to prevent interference Orthogonality in the frequency domain: FD-OCC arranges DMRS in orthogonal or comb-like patterns to prevent interference Fig. 8 shows a second example of DMRS allocation according to operation example 1. As shown in Fig. 8, in the case of an OCC pattern, the sequence length can be ensured, which makes it possible to improve the accuracy of DMRS estimation. Orthogonality can be ensured by multiplying each DMRS port by a different FD-OCC pattern (or TD-OCC).

[0096] Fig. 9 shows a third example of DMRS allocation according to operation example 1. As shown in Fig. 9, DMRSs may be allocated in a comb-like pattern. The comb-like pattern may refer to a state in which DMRSs are allocated at regular intervals (or irregular intervals) in the frequency direction (or time direction).

[0097] In the example of allocation on the left side of Figure 9, interference does not occur because each DMRS port transmits the DMRS in a different Resource Element (RE). In the example of allocation on the right side of Figure 9, interference does not occur because each DMRS port transmits the DMRS at a different time. Furthermore, with this type of DMRS allocation, transmission is not performed using multiple OCC patterns, so it is possible to prevent an increase in the Peak-to-Average Power Ratio (PAPR).

[0098] (3.3.1.2) FD-OCC Mapping Pattern Fig. 10 shows an example (part 1) of a mapping pattern of FD-OCC according to operation example 1. This FD-OCC mapping pattern (referred to as Opt. 1) is characterized by being resistant to propagation delay and having a high PAPR. Fig. 10 shows an example in which the number of FD-ports is 2 and the number of DMRSREs is 2. As shown in Fig. 10, for example, in the case of FD-OCC pattern example 2, 1 and -1 may be repeated.

[0099] The mapping pattern and index of the DMRS may be determined according to a predetermined rule, or may be notified by higher layer signaling.

[0100] Fig. 11 shows an example (part 2) of a mapping pattern of FD-OCC according to operation example 1. As in Fig. 10, the FD-OCC mapping pattern (Opt. 1) is characterized by being resistant to propagation delay and having a high PAPR. Fig. 11 shows an example in which the number of FD-ports is 4 and the number of DMRSREs is 4. As shown in Fig. 11, for example, in the case of FD-OCC pattern example 2, +1, j, -1, +j may be repeated.

[0101] Fig. 12 shows an example (part 3) of a mapping pattern of FD-OCC according to operation example 1. This FD-OCC mapping pattern (referred to as Opt. 2) uses cyclic shift and is characterized by its low tolerance to propagation delay and low PAPR. Note that Fig. 12 does not show the legends for DMRS, UCI, and No data, but they are the same as Fig. 11 and so on (same below).

[0102] As shown in Fig. 12, the amount of phase rotation (α) may be determined from the cyclic index. When there are N RE DMRSs, N orthogonal DMRSs are generated (RE = 5 in the figure). The mapping between the cyclic index that determines the amount of phase rotation and the orthogonal sequence index may be determined according to a predetermined rule, or may be notified by signaling from a higher layer. In this case, the cyclic index may be assigned evenly so that the difference in the amount of phase rotation becomes large.

[0103] (3.3.1.3) Comb-like DMRS arrangement pattern As described above, when DMRSs are arranged in a comb-like pattern, interference can be prevented by arranging the DMRSs in different REs for each port. In other words, since transmission is not performed using multiple OCC patterns, an increase in PAPR can be prevented.

[0104] Fig. 13 shows an example (part 4) of DMRS allocation according to operation example 1. Fig. 13 shows an example (left side) in which the number of FD-ports is 2, and an example (right side) in which the number of TD-ports is 2.

[0105] In the case where the number of TD-ports is two, the DMRS ports may be usable only when they are not arranged in a comb-like pattern in the frequency direction. The DMRS mapping pattern and index may be determined according to a predetermined rule, or may be notified by signaling from a higher layer.

[0106] Fig. 14 shows an example (part 5) of DMRS allocation according to operation example 1. Fig. 14 shows an example (left side) in which the number of FD-ports is 4, and an example (right side) in which the number of FD-ports and the number of TD-ports are both 2.

[0107] The number of FD-ports may be set to 2, the number of TD-ports to 2, or the number of TD-ports to 4. The method of mapping orthogonal indexes to each layer may be determined according to a predetermined rule, or may be notified by signaling from a higher layer.

[0108] For example, the index may be assigned to each layer in order of index, or the orthogonal index of each layer may be specified by signaling from a higher layer.

[0109] (3.3.1.4) DFT-S-OFDM for PUCCH format 3.4 When MIMO transmission of PUCCH is performed according to PUCCH format 3.4 (PF 3, 4), PUCCH (DMRS) may be transmitted without applying transform precoding (also known as DFT spread or DFT-S-OFDM). 3GPP Releases 15 and 16 specify that transform precoding should always be applied only to UCI data symbols before transmission.

[0110] The method of not applying transform precoding is as follows:

[0111] (Opt.1): Specifies whether to use transform precoding in higher layers. (Opt.2): Do not apply transform precoding at Layer 2 (e.g. MAC) or above, or when MIMO is configured (Layer 1 may also be included) Fig. 15 shows an example of application of transform precoding to a DMRS for PUCCH and an example of the configuration of a PUCCH-Config information element according to operation example 1. As shown in Fig. 15, whether or not to apply (multiply) transform precoding (DFT spread) during MIMO transmission of PUCCH may be notified to UE 200 by higher layer signaling.

[0112] Also, as shown in FIG. 15, for example, the PUCCH-Config information element may indicate whether or not transform precoding is to be applied (see the transformPrecoder field) (underlined parts indicate relevant parts, same below).

[0113] (3.3.1.5) Arrangement of orthogonal DMRS for PUCCH format 3.4 When MIMO transmission of PUCCH is performed in accordance with PUCCH format 3.4 (PF 3, 4), DMRSs according to the PF are made orthogonal in the time domain or frequency domain.

[0114] Here, to ensure orthogonality in the time domain, DMRS may be made orthogonal by TD-OCC, or interference may be prevented by allocating only a portion of the DMRS resources to one port.

[0115] Fig. 16 shows a sixth example of DMRS allocation according to the first operational example. As shown in Fig. 16, in the case of a TD-OCC pattern, the sequence length can be ensured, which makes it possible to improve the accuracy of DMRS estimation. Orthogonality can be ensured by multiplying each DMRS port by a different TD-OCC pattern.

[0116] Furthermore, when DMRS is arranged in a comb-like pattern, transmission using multiple TD-OCC patterns is not performed, which makes it possible to prevent an increase in PAPR. As shown in Figure 16, interference does not occur when each DMRS port transmits DMRS at a different time.

[0117] Fig. 17 shows an example (part 7) of DMRS allocation according to operation example 1. Specifically, Fig. 17 shows an example of allocation of Opt. 1 and Opt. 2.

[0118] In Opt.1, as described above, DMRSs are arranged in a comb-like pattern. In Opt.2, DMRSs (resources) are arranged in multiple consecutive symbols, and DMRSs may be arranged in only one symbol per port.

[0119] In the case of Opt.2, since transmission using multiple TD-OCC patterns is not performed, it is possible to prevent an increase in PAPR. Also, by placing the DMRS in the center of the slot, it is possible to reduce the number of symbols that have low correlation with the data symbols.

[0120] As shown in Figure 17, in Opt.1, the DMRS of each port is not centered, so there are UCI symbols with low correlation with the DMRS. In Opt.2 (when Intra-slot is applied (DM-RS 4 symbols)), the DMRS of each port is placed in the center, so there are fewer UCI symbols with low correlation with the DMRS. Also, in Opt.2 (DM-RS 2 symbols), the placed DMRS symbols are different between ports, so there is no interference.

[0121] As described above, in Opt. 2, DMRS symbols may be arranged consecutively, with one DMRS symbol arranged in each port. In this case, a new DMRS symbol position applicable in normal times may be set.

[0122] Fig. 18 shows an example (part 8) of DMRS allocation according to operation example 1. Specifically, the left side of Fig. 18 shows an example of DMRS allocation according to normal PFs 3 and 4. As shown in the upper right side of Fig. 18, when there are three DMRS ports, three consecutive DMRS symbols may be allocated, with one symbol allocated to each DMRS port. In this case, UCI data may be mapped to the remaining UCI symbols.

[0123] Furthermore, as shown in the middle and bottom right sections of Fig. 18, the additional DMRS may be arranged before or after the arrangement of DMRSs according to normal PFs 3 and 4. Specifically, the middle right section of Fig. 18 shows an example in which the additional DMRS is arranged before (i.e., at a position earlier in time) the arrangement of DMRSs according to normal PFs 3 and 4. The bottom right section of Fig. 18 shows an example in which the additional DMRS is arranged after (i.e., at a position later in time) the arrangement of DMRSs according to normal PFs 3 and 4.

[0124] The placement (before or after) of such an additional DMRS may be determined according to a predetermined rule or may be notified by signaling from a higher layer.

[0125] Fig. 19 shows an arrangement example (part 9) of DMRSs according to operation example 1. Specifically, Fig. 19 shows an arrangement example of Opt. 1 and Opt. 2.

[0126] Opt.1 applies the FD-OCC mapping pattern (which is tolerant to propagation delays and has a high PAPR), while Opt.2 applies the cyclic shift pattern (which is less tolerant to propagation delays and has a low PAPR).

[0127] As shown in FIG. 19, when orthogonality is provided in the frequency domain, interference can be prevented by orthogonalizing DMRSs using FD-OCC or by arranging DMRSs in a comb-like pattern.

[0128] In the case of Opt.1, the FD-OCC pattern example may follow the arrangement example described above (PF 2 may also be used). In this case, the mapping between the OCC pattern and the FD-port index may be determined according to a predetermined rule or may be notified by signaling from a higher layer.

[0129] In the case of Opt.2, the cyclic shift index may follow the arrangement example described above (PF 2 may also be used). In this case, the mapping between the cyclic shift index and the orthogonal sequence index may be determined according to a predetermined rule or may be notified by signaling from a higher layer.

[0130] Fig. 20 shows a tenth example of DMRS arrangement according to operation example 1. Specifically, Fig. 20 shows an example (referred to as Opt. 3) in which DMRSs are arranged in a comb-like pattern. Like Opt. 2, Opt. 3 is susceptible to propagation delay and has a low PAPR.

[0131] Specifically, Fig. 20 shows an example where the number of FD-ports is 2 (left side) and an example where the number of FD-ports is 4 (right side). In this case, the mapping pattern and index of the DMRS may be determined according to a predetermined rule, or may be notified by signaling from a higher layer.

[0132] As described above, when orthogonality is to be provided in the frequency domain, interference can be prevented by orthogonalizing DMRSs using FD-OCC or by arranging DMRSs in a comb-like pattern.

[0133] In this case, in PF 4, both UCI and DMRS can be multiplexed by FD-OCC, but the maximum number of FD-OCC patterns or FD-OCC lengths that are multiplied only by DMRS may be changed depending on the number of FD-OCCs. Also, in this case, the maximum number of FD-OCC patterns or FD-OCC lengths may be changed depending on the number of PRBs of PUCCH.

[0134] Fig. 21 shows an example of the configuration of a PUCCH-Config information element according to operation example 1. Specifically, the upper part of Fig. 21 shows the PUCCH-Config for PF 3, and the lower part of Fig. 21 shows the PUCCH-Config for PF 4.

[0135] As shown in FIG. 21, the PUCCH-Config information element may indicate a configuration parameter related to the number of orthogonal DMRSports by which the UCI and the DMRS are multiplied (applied).

[0136] PF 3 may indicate the number of PRBs (nr of PRBs). nofTD-ports (nofFD-ports) is a configuration parameter for TD-OCC (FD-OCC) that applies only to DMRS. In this case, the maximum value of the variable may be limited depending on nr of PRBs, occ-length, and occIndex.

[0137] (3.3.2) Operational example 2: PUCCH resource expansion To realize PUCCH MIMO transmission, the PUCCH resource may be extended as follows: Specifically, the PUCCH resource may be extended to a PUCCH resource compatible with MIMO transmission by higher layer signaling, and the extended content may be notified to the UE 200 as MIMO transmission information.

[0138] For example, one PUCCH resource may include information elements regarding the next MIMO transmission.

[0139] Setting the OCC pattern and / or allocated resources for PUCCH DMRS -DMRSport settings used during MIMO transmission Precoding matrix settings Fig. 22 shows a configuration example (part 1) of the PUCCH-Config information element according to operation example 2. As shown in Fig. 22, the PUCCH-Config information element may include the following fields regarding the setting of the OCC pattern / allocated resources during MIMO transmission.

[0140] nofTD-ports: Number of orthogonal DMRS ports on the frequency axis nofFD-ports: Number of orthogonal DMRS ports on the time axis Also, a field related to the setting of the DMRS port to be used during MIMO transmission may be included. In this case, instead of selecting the DMRS port on the frequency axis or the time axis, the DMRS port may be selected by a single variable, for example, as follows:

[0141] Index = (frequency port index) × (total number of time port indexes) + (total number of time port indexes) Furthermore, a field related to the setting of a precoding matrix may be included. In this field, the number of orthogonal DMRS ports on the time axis (or on the frequency axis) may be calculated from the size of the precoding matrix and the number of orthogonal DMRS ports on the frequency axis (or on the time axis).

[0142] Furthermore, information elements (or fields) related to the next MIMO transmission may be predefined by 3GPP specifications rather than by higher layer signaling.

[0143] Setting the OCC pattern and / or allocated resources for PUCCH DMRS The number of orthogonal DMRS ports on the frequency axis and the time axis of the PUCCH DMRS may be uniquely determined according to higher layer signaling or a predetermined rule. In this case, the number of PUCCH PRBs and / or the occ-length of PF4 may be changed depending on the frequency band.

[0144] -DMRS port setting used during MIMO transmission The DMRS ports used in a predetermined rule or higher layer signaling may be determined in index order.

[0145] Fig. 23 shows a configuration example (part 2) of a PUCCH-Config information element according to operation example 2. As shown in Fig. 23, the number of unique orthogonal DMRS ports may be notified according to the number of PRBs, occ-length, and frequency band (or, as described above, may be specified in advance in the 3GPP specifications).

[0146] Furthermore, in the 3GPP specifications, when the DMRS port used for transmission is determined in index order, the FD-orthogonal-index and TD-orthogonal-index are not necessarily required (may not be required).

[0147] (3.3.3) Operation example 3: Example of notification of precoding matrix Regarding the above-described Precoding matrix, the following information may be notified to the UE 200.

[0148] Selection of precoding matrix by TPMI (Opt.1) as in PUSCH (Alt.1): Uses the same TPMI table / Precoding table as PUSCH (Alt.2): Use TPMI table / Precoding table for PUCCH (Alt.3): Use the same TPMI table (or Precoding table) as PUSCH and the Precoding table (or TPMI table) for PUCCH Fig. 24 shows an application example (part 1) of the TPMI table / Precoding table according to operation example 3. As shown in Fig. 24, the TPMI table to be referenced may be selected depending on the Maxrank, the number of antenna ports, and whether or not transform precoding is used. As described above, the details of the TPMI table / Precoding table shown in Fig. 24 are specified in 3GPP TS38.211 Chapter 6.3.1.4 and TS38.212 Chapter 7.3.1.1, etc.

[0149] In addition, in the case of the above-mentioned Opt.1 (selection of a precoding matrix by TPMI as in the case of PUSCH), the Maxrank must be notified in order to refer to the TPMI table, but the Maxrank may be notified by any of the following methods. (Alt.1): Added as a parameter to PUCCHconfig (Alt.2): Share Maxrank in PUSCHconfig with PUCCHconfig Alternatively, a precoding matrix may be selected without notifying Maxrank (Opt. 2). In this case, the operation may be performed in accordance with one of the following methods.

[0150] (Alt.1): A common TPMI table is referenced for all MaxRanks. In this case, a TPMI table may be generated specifically for PUCCH.

[0151] (Alt.2): Specifies the index of the Precoding table without going through the TPMI table. In this case, a Precoding table may be generated specifically for PUCCH.

[0152] Fig. 25 shows an application example (part 2) of the TPMI table / Precoding table according to operation example 3. As shown in Fig. 25, the precoding to be used may be directly specified from the Precoding table.

[0153] (3.3.4) Example 4: Extension of spatial relation For non-codebook MIMO, the spatial relation may be extended so that multiple reference signals (RS) can be specified using higher layer signaling. For example, the spatial relation may be extended by the following method.

[0154] (Alt.1): Set multiple RS / TPMIs by spatial relation (Alt.2): Add spatial relation group consisting of multiple spatial relations to PUCCH-Config A spatial relation info ID may be set in the set spatial relation group and selected in the same way as the spatial relation info. Also, a precoding matrix to be used may be set in the spatial relation group in a similar manner.

[0155] Fig. 26 shows a configuration example of a PUCCH-SpatialRelationInfo information element according to operation example 4. As shown in Fig. 26, multiple reference signals (which may include synchronization signal blocks (SSBs)) may be set in one Spatial relation info. In this case, if the number of MIMO layers is two, only reference signal 1 and reference signal 2 may be used.

[0156] Furthermore, a precoding matrix for Codebook-type MIMO transmission may be set by spatial relation info (TPMI). In this case, a precoding matrix for each number of MIMO layers may be set.

[0157] (3.3.5) Example 5: Spatial relation selection in MAC-CE The spatial relation may be selected by MAC-CE. For example, for non-codebook MIMO, MAC-CE may be used to select a plurality of spatial relations as follows.

[0158] (Opt.1): Enables selection of multiple spatial relations for one PUCCH resource using MAC-CE according to 3GPP Release 15 In this case, a reserved bit may be used to notify that multiple MAC-CEs are selectable.

[0159] (Opt.2): Define a new MAC-CE and enable selection of up to 64 spatial relations using the method described above. Fig. 27 shows a configuration example (part 1) of a MAC-CE according to operation example 5. The MAC-CE shown in Fig. 27 may be newly defined. For example, when the reserved bit (R) of a MAC-CE according to 3GPP Release 15 is 0, an existing MAC-CE according to 3GPP Release 15 may be selected, and one spatial relation may be selected.

[0160] On the other hand, if the reserved bit (R) of the MAC-CE according to 3GPP Release 15 is 1, multiple spatial relations may be selected. In this case, as shown in FIG. 27, the new MAC-CE The number of selectable spatial relations may be expanded.

[0161] Furthermore, for non-codebook MIMO, multiple spatial relations may be selected using MAC-CE (referred to as Opt. 3).

[0162] Specifically, using the Rel. 16 enhanced PUCCH spatial relation, multiple spatial relations may be selected for one PUCCH resource.

[0163] In this case, it may be indicated by using a reserved bit that multiple spatial relations can be assigned to one PUCCH resource ID.

[0164] Fig. 28 shows a configuration example (part 2) of a MAC-CE according to operation example 5. As in (part 1) shown in Fig. 27, when the reserved bit (R) of the MAC-CE is 0, an existing MAC-CE according to 3GPP Release 15 may be selected, and one spatial relation may be selected.

[0165] On the other hand, if the reserved bit (R) of the MAC-CE is 1, multiple spatial relations may be selected.

[0166] Also, as shown in FIG. 28, a plurality of spatial relation info IDs may be selected for one PUCCH resource.

[0167] (3.3.6) Operation Example 6: DMRS port / precoding selection in MAC-CE Also, the DMRS port and precoding of the PUCCH resource may be selected using MAC-CE.

[0168] Specifically, as for the precoding information, information on a precoding matrix applied to MIMO transmission of PUCCH may be notified. In this case, the index of the TPMI used for MIMO transmission of PUCCH may be notified.

[0169] Furthermore, regarding the selection of a DMRS port, multiple DMRS ports used for MIMO transmission of PUCCH may be designated.

[0170] Fig. 29 shows a configuration example (part 1) of a MAC-CE according to operation example 6. Fig. 29 shows an example in which the number of DMRS ports is eight or less. When multiple Si shown in Fig. 29 is 1, UE 200 may use the spatial relation of the field that is 1 for MIMO transmission.

[0171] Fig. 30 shows a second example of the configuration of a MAC-CE according to operation example 6. In Fig. 30, a DMRS port index may be specified. For example, when a DMRS port is specified using 8 bits, a maximum of 256 DMRS ports can be specified.

[0172] (3.3.7) Operational Example 7: Semi-Persistent (SP) CSI reporting Activation MAC-CE Furthermore, multiple DMRS ports used for MIMO transmission of PUCCH may be specified using SP CSI reporting on PUCCH activation / deactivation MAC-CE. SP CSI reporting on PUCCH activation / deactivation MAC-CE is specified in Chapter 6.1.3.16 of 3GPP TS38.321.

[0173] In this case, the UE 200 may perform the following process.

[0174] (i) In different DMRS ports, PUCCH resources of the same time and frequency are associated with respective CSI reports.

[0175] (ii) SP CSI reporting on PUCCH activation / deactivation: Using MAC-CE, multiple CSI reports in (i) are selected.

[0176] (iii) Multiple PUCCH resource information linked to a CSI report is combined and transmitted via MIMO.

[0177] In this case, the reserved bit of the SP CSI reporting on PUCCH activation / deactivation MAC-CE may be used to indicate that a MAC-CE is capable of selecting multiple CSI reports and / or Precoding matrix information.

[0178] 31 shows a configuration example of SP CSI reporting on PUCCH activation / deactivation MAC-CE according to operation example 7. When the reserved bit (R) of MAC-CE is 0, an existing MAC-CE conforming to 3GPP Release 15 is selected, and when the reserved bit (R) of MAC-CE is 1, MIMO transmission of PUCCH may be performed in accordance with multiple CSI reports. Also, information on a precoding matrix may be added to the reserved bits.

[0179] When multiple Si shown in FIG. 31 are 1, the UE 200 may use multiple pieces of PUCCH resource information linked to the CSI report in the field where Si is 1 for MIMO transmission.

[0180] (3.3.8) Operation Example 8: Notification of PDSCH Resource Allocation Information Using DCI Information regarding MIMO transmission of the PUCCH may be notified to the UE 200 using DCI for PDSCH resource allocation.

[0181] For example, the following information regarding HARQ feedback PUCCH MIMO may be notified based on DCI that is linked to HARQ feedback and performs PDSCH resource allocation.

[0182] Precoding information (Opt.1):: TMPI is linked to the PUCCH resource indicator and notified (Opt.2): Add a field to select Precoding to DCI -Select multiple DMRS ports to use (Opt.1): Link the DMRS port for PUCCH MIMO transmission to the antenna port table for PDSCH MIMO transmission and notify (Opt.2): Added a field to select DMRS port for DCI. (Opt.3): Select DMRS port according to the CCE index where DCI is placed -Select multiple RSs (Non-codebook type only) (Opt.1): Add a field equivalent to the SRS resource indicator to DCI Fig. 32 shows the relationship between DCI, PDSCH, and PUCCH according to operation example 8. As shown in Fig. 32, DCI for PDSCH (for example, format 1_0) may also be referred to during MIMO transmission of PUCCH. In other words, the DCI may be applied to PUCCH in addition to PDSCH.

[0183] (3.3.9) Example 9: Sharing MIMO information for PUSCH As described above, the PUSCH MIMO transmission method specified by the DCI may be referred to during MIMO transmission of the PUCCH. In this case, information on the SRS resource indicator, DCI TPMI, and selected DMRS port used during PUSCH resource allocation may also be shared during MIMO transmission of the PUCCH.

[0184] The DCI to be referenced may be selected in any of the following ways:

[0185] (Alt.1): Refer to the DCI in the same slot (or immediately before / after) that allocates the PDSCH resource allocation associated with the PUCCH (for HARQ feedback) (Alt.2): Refer to DCI in the same slot as (or immediately before / after) the PUCCH to be transmitted (for CSI report / HARQ feedback) (Alt.3): Refer to the PUSCH in the same slot as the PUCCH to be transmitted (or immediately before / after) (for CSI report / HARQ feedback) In this case, information about the slot to be referenced may be specified by signaling (DCI) of a higher or lower layer.

[0186] Fig. 33 shows the relationship between DCI, PDSCH, and PUCCH according to operation example 9. DCI may be referred to during MIMO transmission of PUCCH. As shown in Fig. 33, DCI may indicate that PUSCH information in the same slot will be referenced ((1) in the figure). Furthermore, the SRS resource indicator and TPMI of the PUSCH in the same slot as the PUCCH may be shared during MIMO transmission of PUCCH.

[0187] (3.3.10) Example 10: Restrictions on notification methods by UCI As described above, various pieces of information can be notified to the UE 200 regarding MIMO transmission of the PUCCH, but notification of some of this information may be restricted.

[0188] For example, the notification content may be limited depending on the UCI. Specifically, the content related to the selection of the spatial relation by the MAC-CE (Operation Example 5) can also be applied to the CSI report and / or HARQ, but such application may be limited.

[0189] Furthermore, sharing of PUSCH MIMO information (Operation Example 9) can also be applied to CSI reports and / or HARQ, but such application may also be restricted. Furthermore, utilization of SP CSI reporting Activation MAC-CE (Operation Example 7) can also be applied to SP CSI reports, but such application may also be restricted. Such restrictions enable flexible operation, such as prioritizing processing of notifications by other methods.

[0190] Note that the DMRS port / precoding selection in MAC-CE (Operation Example 6) can also be applied to HARQ, but since dynamic changes to precoding are desirable, DCI may be used if it can be utilized.

[0191] (3.3.11) Operation Example 11: Reporting UE capability Regarding MIMO transmission of PUCCH, UE 200 may report the following information to the network as UE Capability Information.

[0192] ·Applicability of orthogonal DMRS for PUCCH · Applicability of OCC to existing PF -Possibility of allocating only some DMRS resources on one port using an existing PF - New PF applicability Applicability of notification methods for MIMO transmission of each PUCCH related to the above-mentioned operation example The UE 200 may report the frequencies (which may be FRs or bands) that it supports by any of the following methods.

[0193] - Support for all frequencies at once (support as a mobile station) · Availability of each frequency · Availability of FR1 / FR2 · Availability of each SCS Furthermore, the UE 200 may report the supported duplex mode in one of the following ways.

[0194] · UE compatibility · Support for each duplex method (TDD / FDD)

[0195] (4) Actions and Effects According to the above-described embodiment, the following advantageous effects can be obtained. UE 200 can configure a DMRS for PUCCH so that the DMRS is orthogonal in at least either the time domain or the frequency domain. Therefore, even if UCI increases due to the amount of CSI-RS feedback (CSI report), the PUCCH capacity can be increased by applying MIMO. This allows UE 200 to adequately handle the increase in UCI.

[0196] In this embodiment, the UE 200 can configure an orthogonal DMRS for the PUCCH using the OCC pattern, thereby enabling the UE 200 to configure the orthogonal DMRS easily and reliably.

[0197] In this embodiment, the UE 200 can share the position of the DMRS for the PUSCH and the position of the DMRS for the PUCCH, and therefore the UE 200 can efficiently configure the orthogonal DMRS for the PUCCH.

[0198] In this embodiment, in a specific transmission mode (MIMO transmission of PUCCH), UE 200 can stop applying transform precoding (DFT spread) to UCI, thereby realizing MIMO transmission of PUCCH while reducing the processing load.

[0199] In this embodiment, orthogonal DMRS symbols for PUCCH may be arranged contiguously using multiple ports, which allows for easy and flexible configuration of orthogonal DMRS.

[0200] In this embodiment, UE 200 can configure an orthogonal DMRS for PUCCH in at least one of the time domain and the frequency domain based on the PUCCH configuration information (IE or MAC-CE). Also, UE 200 may configure at least one of precoding to be applied to the PUCCH or a port (DMRSport) of the DMRS based on the PUCCH configuration information. Furthermore, UE 200 may configure multiple spatial relations to be applied to the PUCCH based on the configuration information. Therefore, UE 200 can perform configuration related to an appropriate orthogonal DMRS based on the PUCCH configuration information.

[0201] In this embodiment, the UE 200 may configure the PUCCH using at least one of the precoding information for the PUCCH and the precoding information for the PUSCH. Furthermore, the UE 200 may configure the PUCCH in a specific transmission mode (MIMO transmission of the PUCCH) based on the DCI for the PDSCH. Therefore, efficient PUCCH configuration can be achieved even during MIMO transmission.

[0202] (5) Other embodiments Although the embodiments have been described above, it will be obvious to those skilled in the art that the present invention is not limited to the description of the embodiments and that various modifications and improvements are possible.

[0203] For example, in the above-described embodiment, MIMO transmission of PUCCH has been described as an example of a specific transmission mode (state), but it does not necessarily have to be MIMO transmission. Specifically, this may be interpreted as a case where a transmission mode (state) that increases the capacity of PUCCH in order to deal with an increase in UCI is applied. Alternatively, as described above, simultaneous transmission of more streams may be interpreted as simultaneous transmission of more streams.

[0204] Furthermore, in the above-described embodiment, an example has been described in which a DMRS (demodulation reference signal) is used as a reference signal for PUCCH, but the reference signal for PUCCH may be called by another name.

[0205] The block diagram (FIG. 3) used in the description of the above-described embodiment shows functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, by wire, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining the single device or multiple devices with software.

[0206] 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, allocating, 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 each is implemented.

[0207] Furthermore, the above-described gNB100 and UE200 (the device) may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 34 is a diagram showing an example of the hardware configuration of the device. As shown in Figure 34, the device may be 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.

[0208] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the apparatus 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.

[0209] Each functional block of the device (see FIG. 3) is realized by any hardware element of the computer device or a combination of the hardware elements.

[0210] In addition, each function of the device is realized by loading specified software (programs) onto hardware such as processor 1001 and memory 1002, causing processor 1001 to perform calculations, control communication via communication device 1004, and control at least one of reading and writing data in memory 1002 and storage 1003.

[0211] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, a register, and the like.

[0212] The processor 1001 also 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 programs used are those that cause a computer to execute at least some of the operations described in the above-mentioned embodiments. Furthermore, the various processes described above may be executed by one processor 1001, or may 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.

[0213] The memory 1002 is a computer-readable recording medium and may be configured by, for example, 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 a program (program code), a software module, etc., that can execute a method according to an embodiment of the present disclosure.

[0214] Storage 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a Compact Disc ROM (CD-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 recording medium may be, for example, a database, a server, or other appropriate medium including at least one of memory 1002 and storage 1003.

[0215] 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 called, for example, a network device, a network controller, a network card, or a communication module.

[0216] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0217] 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).

[0218] Furthermore, each device such as the processor 1001 and the memory 1002 is connected to 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.

[0219] Furthermore, the device 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, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0220] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0221] Each aspect / embodiment described in the present disclosure may be applied to at least one of a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, a 4th generation mobile communication system (4G), a 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable system, and a next-generation system extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G) may also be applied.

[0222] 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.

[0223] In the present disclosure, a specific operation described as being performed by a base station may also 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, an MME or an S-GW, etc., but are not limited to these). 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.

[0224] Information, signals (information, etc.) may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0225] 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.

[0226] 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).

[0227] 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).

[0228] 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.

[0229] 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.

[0230] 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.

[0231] 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.

[0232] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0233] 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.

[0234] 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.

[0235] 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.

[0236] A base station can accommodate one or more (e.g., three) cells (also called sectors). 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 services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0237] The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage area.

[0238] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0239] 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.

[0240] 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 object, or the mobile object itself. The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (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 Internet of Things (IoT) device such as a sensor.

[0241] Furthermore, a base station in the present disclosure may be read as a mobile station (user terminal, the same applies hereinafter). For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between multiple mobile stations (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the mobile station may be configured to have the functions of a base station. 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 uplink channel and downlink channel may be read as side channel.

[0242] Similarly, a mobile station in the present disclosure may be interpreted as a base station, in which case the base station may have the functions of a mobile station. A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0243] Numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by a transceiver in the frequency domain, and specific windowing operations performed by a transceiver in the time domain.

[0244] A slot may consist of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) A slot may be a numerology-based time unit.

[0245] A slot may include multiple minislots. Each minislot may consist of one or more 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.

[0246] 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.

[0247] 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 (e.g., 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.

[0248] 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.

[0249] 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.

[0250] 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.

[0251] 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.

[0252] 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.

[0253] 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.

[0254] The time domain of an RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length. Each TTI, subframe, etc. may be composed of one or more resource blocks.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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."

[0260] The above-described structures of the radio frame, subframe, slot, minislot, and symbol 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, and other configurations can be changed in various ways.

[0261] 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.

[0262] The reference signal may also be abbreviated as Reference Signal (RS), and may also be called a pilot depending on the applicable standard.

[0263] 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."

[0264] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0265] 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 therein or that the first element must precede the second element in some way.

[0266] 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.

[0267] 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.

[0268] 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.

[0269] 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."

[0270] 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. [Explanation of symbols]

[0271] 10. Wireless communication systems 20 NG-RAN 100 gNB 200 UE 210 Radio signal transmitter / receiver 220 Amplifier section 230 Modulation and Demodulation Unit 240 Control signal / reference signal processing section 250 Encoding / Decoding Unit 260 Data transmission and reception unit 270 Control Unit 1001 processor 1002 memory 1003 Storage 1004 Communication equipment 1005 Input Device 1006 Output Device 1007 Bus

Claims

1. a receiver for receiving a Medium Access Control (MAC) control element (CE); a controller for determining one or more spatial relationships for one Physical Uplink Control Channel (PUCCH) resource based on the MAC CE; a transmitter configured to transmit a PUCCH using the one PUCCH resource and the one or more spatial relationships; Equipped with If the bit field included in the MAC CE is set to 1, it indicates that the MAC CE includes multiple spatial relation info ID fields for the one PUCCH resource, and the control unit determines multiple spatial relationships based on the MAC CE; If the bit field is set to 0, it indicates that the MAC CE does not include multiple spatial relation info ID fields for the one PUCCH resource, and the control unit determines one spatial relationship based on the MAC CE.

2. a transmitter for transmitting a Medium Access Control (MAC) control element (CE); a receiver for receiving a Physical Uplink Control Channel (PUCCH) transmitted using one PUCCH resource and one or more spatial relationships; Equipped with When a bit field included in the MAC CE is set to 1, it indicates that the MAC CE includes multiple spatial relation info ID fields for the one PUCCH resource, and the receiving unit receives the PUCCH transmitted using multiple spatial relations determined based on the MAC CE; When the bit field is set to 0, it indicates that the MAC CE does not include multiple spatial relation info ID fields for the one PUCCH resource, and the receiving unit receives the PUCCH transmitted using one spatial relation determined based on the MAC CE.

3. A terminal and a wireless base station are provided, The terminal a receiver for receiving a Medium Access Control (MAC) control element (CE); a controller for determining one or more spatial relationships for one Physical Uplink Control Channel (PUCCH) resource based on the MAC CE; a transmitter configured to transmit a PUCCH using the one PUCCH resource and the one or more spatial relationships; Equipped with If the bit field included in the MAC CE is set to 1, it indicates that the MAC CE includes multiple spatial relation info ID fields for the one PUCCH resource, and the control unit determines multiple spatial relationships based on the MAC CE; If the bit field is set to 0, it indicates that the MAC CE does not include multiple spatial relation info ID fields for the one PUCCH resource, and the control unit determines one spatial relationship based on the MAC CE; The radio base station a transmitter for transmitting the MAC CE; A receiving unit for receiving the PUCCH; A wireless communication system comprising:

4. a terminal receiving a Medium Access Control (MAC) control element (CE); The terminal determines, based on the MAC CE, one or more spatial relationships for one Physical Uplink Control Channel (PUCCH) resource; The terminal transmits a PUCCH using the one PUCCH resource and the one or more spatial relationships; Equipped with If the bit field included in the MAC CE is set to 1, it indicates that the MAC CE includes multiple spatial relation info ID fields for the one PUCCH resource, and in the determining step, the terminal determines multiple spatial relations based on the MAC CE; When the bit field is set to 0, it indicates that the MAC CE does not include multiple spatial relation info ID fields for the one PUCCH resource, and in the determining step, the terminal determines one spatial relation based on the MAC CE.

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