Terminal

Abstract

To provide a terminal capable of realizing more efficient repetition of uplink control channel transmission when multiple antenna beams are used from a wireless base station.SOLUTION: A terminal transmits an uplink control channel corresponding to an antenna beam transmitted from a wireless base station. The terminal assumes the symbol position of the repeated transmission of the uplink control channel on the basis of explicit or implicit notification.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present disclosure relates to a terminal that performs wireless communication, and in particular to a terminal that transmits an uplink control channel. [Background technology]

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

[0003] In Release 17 of 3GPP, NR Coverage Enhancement (CE) has been agreed upon as a Study Item (SI) (Non-Patent Document 1).

[0004] In this SI, an uplink data channel (PUSCH: Physical Uplink Shared Channel) and an uplink control channel (PUCCH: Physical Uplink Control Channel) are listed as channels whose performance should be improved.

[0005] A common method for realizing CE is known to be to repeat the transmission of the channel in the time direction. [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] "New SID on NR coverage enhancement", RP-193240, 3GPP TSG RAN Meeting #86, 3GPP, December 2019 Summary of the Invention

[0007] However, implementing CE in NR poses the following problems: In 3GPP Release 15 and Release 16 (NR), a radio base station (gNB) can transmit sequentially by switching between multiple antenna beams with different radiation directions in the time domain.

[0008] However, when multiple antenna beams are switched in the time domain, it is incompatible with the PUCCH repetition specified in NR, and when PUCCH repetition is combined with multiple antenna beams, restrictions arise on the repetition configuration, making it difficult to design efficient resource allocation for PUCCH repetition.

[0009] Therefore, the following disclosure has been made in consideration of such circumstances, and aims to provide a terminal that can achieve more efficient repetition of uplink control channel transmission when multiple antenna beams from a radio base station are used.

[0010] One aspect of the present disclosure is a terminal (UE200) that includes a transmitter (control signal / reference signal processor 240) that transmits an uplink control channel corresponding to an antenna beam (beam BM) transmitted from a radio base station (gNB100), and a controller (controller 270) that controls repeated transmission of the uplink control channel, and the controller assumes the symbol position of the repeated transmission based on explicit or implicit notification. [Brief explanation of the drawings]

[0011] [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 frequency ranges used in the wireless communication system 10. As shown in FIG. [Figure 3]FIG. 3 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 4] FIG. 4 is a functional block diagram of the UE 200. [Figure 5] FIG. 5 is a diagram showing an example of PUCCH repetition in accordance with 3GPP Release-15 and 16. [Figure 6] FIG. 6 is a diagram showing a configuration example (part 1) of repetition mapping to a plurality of antenna beams according to the first operation example. [Figure 7] FIG. 7 is a diagram showing a configuration example (part 2) of repetition mapping to a plurality of antenna beams according to the first operation example. [Figure 8] FIG. 8 is a diagram showing a configuration example (part 3) of repetition mapping to a plurality of antenna beams according to the first operation example. [Figure 9] FIG. 9 is a diagram showing an example of defining the start symbol of a repetition and the slot difference between repetitions according to the first operational example. [Figure 10] FIG. 10 is a diagram illustrating a configuration example of PUCCH-Config according to the first operation example. [Figure 11] FIG. 11 is a diagram illustrating that the UE 200 according to the first operation example assumes the mapping position of the repetition with reference to the number of beams BM. [Figure 12] FIG. 12 is a diagram illustrating an example of the relationship between antenna beams and PUCCH repetition according to the second operation example. [Figure 13] FIG. 13 is a diagram illustrating an example of dynamic notification of PUCCH repetition using DCI format 1_0 or 1_1 according to the third operation example. [Figure 14] FIG. 14 is a diagram illustrating an example of dynamic notification of PUCCH repetition using MAC-CE according to the third operation example. [Figure 15] FIG. 15 is a diagram illustrating an example of a hardware configuration of the UE 200. As shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] 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.

[0013] (1) Overall configuration of the wireless communication system 1 is a diagram showing the overall schematic configuration of a wireless communication system 10 according to this embodiment. The wireless communication system 10 is a wireless communication system conforming to 5G New Radio (NR) and includes a Next Generation-Radio Access Network 20 (hereinafter referred to as NG-RAN 20) and a terminal 200 (hereinafter referred to as UE 200, User Equipment, UE). Note that the wireless communication system 10 may also be a wireless communication system conforming to a scheme called Beyond 5G or 6G.

[0014] 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.

[0015] 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."

[0016] The gNB 100 is a 5G-compliant radio base station that performs 5G-compliant radio communication with the UE 200. The gNB 100 and the UE 200 are capable of supporting Massive MIMO (Multiple-Input Multiple-Output), which generates a more directional antenna beam (hereinafter referred to as 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 two NG-RAN nodes.

[0017] The gNB 100 can transmit multiple beams BM with different transmission directions (which may also be simply referred to as directions, or radiation directions, or coverages) in a space- and time-division manner. Note that the gNB 100 may transmit multiple beams BM simultaneously.

[0018] The wireless communication system 10 may also support a plurality of frequency ranges (FR).

[0019] 2, the wireless communication system 10 supports FR1 and FR2. The frequency bands of each FR are as follows:

[0020] FR1: 410 MHz to 7.125 GHz FR2: 24.25 GHz~52.6 GHz FR1 uses 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, using an SCS of 60 or 120 kHz (240 kHz may be included) and a bandwidth (BW) of 50 to 400 MHz.

[0021] Note that SCS may be interpreted as numerology, which is defined in 3GPP TS38.300 and corresponds to one subcarrier spacing in the frequency domain.

[0022] 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.

[0023] 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).

[0024] FIG. 3 shows an example of the configuration of a radio frame, a subframe, and a slot used in the radio communication system 10. In FIG.

[0025] As shown in Figure 3, one slot consists of 14 symbols (which may also be called 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). Also, the number of slots per subframe may differ depending on the SCS.

[0026] 3 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.

[0027] The wireless communication system 10 also supports Coverage Enhancement (CE) that extends the coverage of the cell formed by the gNB 100. One method of CE is to improve the probability of successful reception by repeating transmission of various channels (control channels or data channels).

[0028] In particular, the wireless communication system 10 can perform repetition of uplink (UL) channels, specifically, an uplink control channel (PUCCH: Physical Uplink Control Channel) and an uplink data channel (PUSCH: Physical Downlink Shared Channel).

[0029] (2) Functional block configuration of wireless communication system Next, a description will be given of the functional block configuration of the wireless communication system 10. Specifically, a description will be given of the functional block configuration of the UE 200.

[0030] Fig. 4 is a functional block diagram of UE 200. As shown in Fig. 4, UE 200 includes radio signal transmitting / receiving unit 210, amplifier unit 220, modem unit 230, control signal / reference signal processing unit 240, encoding / decoding unit 250, data transmitting / receiving unit 260, and control unit 270.

[0031] The radio signal transmitting / receiving unit 210 transmits and receives radio signals conforming to NR. The radio signal transmitting / receiving unit 210 supports Massive MIMO, CA that uses a bundle of multiple CCs, and DC that simultaneously communicates between a UE and two NG-RAN nodes.

[0032] In particular, the radio signal transmitting / receiving unit 210 can receive an SSB (SS / PBCH Block), which is a block of a synchronization signal / broadcast channel configured from an SS (Synchronization Signal) and a PBCH (Physical Broadcast Channel). The SSB is mainly transmitted periodically by the UE 200 when starting communication in order to detect a cell ID and reception timing. The SSB is also used to measure the reception quality of each cell.

[0033] The transmission periodicity of SSB may be specified as 5, 10, 20, 40, 80, 160 milliseconds, etc. Note that the initial access UE 200 may assume a transmission period of 20 milliseconds.

[0034] The network (NG-RAN 20) can notify the UE 200 of the index indication (ssb-PositionsInBurst) of the actually transmitted SSBs by system information (SIB1) or signaling of the radio resource control layer (RRC).

[0035] In addition, the maximum number of beams BM used for SSB transmission may be 64, but this maximum number may be extended (for example, to 256) to cover a certain geographical area with narrow beams. In this case, the number of SSBs will also be 256, and values ​​from #64 onwards may be used as indices to identify SSBs (SSB index).

[0036] The SS is composed of a primary synchronization signal (PSS: Primary SS) and a secondary synchronization signal (SSS: Secondary SS).

[0037] The PSS is a known signal that the UE 200 first attempts to detect in the cell search procedure, and the SSS is a known signal that is transmitted to detect a physical cell ID in the cell search procedure.

[0038] The PBCH includes information necessary for UE200 to establish frame synchronization with the NR cell formed by gNB100 after detecting the SS / PBCH Block, such as the radio frame number (SFN: System Frame Number) and an index for identifying the symbol positions of multiple SS / PBCH Blocks within a half frame (5 milliseconds).

[0039] The PBCH can also include system parameters required for receiving system information (SIB). Furthermore, the SSB also includes a broadcast channel demodulation reference signal (DMRS for PBCH). The DMRS for PBCH is a known signal transmitted to measure the wireless channel conditions for PBCH demodulation.

[0040] UE 200 may assume that each SSB is associated with a beam BM with a different transmission direction (coverage). This allows UE 200 located in an NR cell to receive any beam BM, acquire the SSB, and begin initial access and SSB detection and measurement.

[0041] The SSB transmission pattern may vary depending on the SCS, frequency range (FR), or other parameters. Furthermore, not all SSBs necessarily need to be transmitted. Depending on the network requirements, status, etc., only a small number of SSBs may be selectively transmitted, and UE 200 may be notified of which SSBs are to be transmitted and which are not.

[0042] The SSB transmission pattern is notified to the UE 200 by the RRC IE (Information Element) called ssb-PositionsInBurst described above.

[0043] 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.

[0044] The modem unit 230 performs data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (gNB100 or another gNB).

[0045] As described above, in this embodiment, CP-OFDM and DFT-S-OFDM can be applied.

[0046] 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 .

[0047] 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.

[0048] Furthermore, 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).

[0049] 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.

[0050] In addition to DMRS and PTRS, reference signals also include Channel State Information-Reference Signal (CSI-RS) and Sounding Reference Signal (SRS). The channels include control channels and data channels, such as 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)), and a Physical Broadcast Channel (PBCH).

[0051] The data channel includes a physical downlink shared channel (PDSCH) and a physical downlink shared channel (PUSCH), etc. Data refers to data transmitted via a data channel.

[0052] In particular, in this embodiment, the control signal and reference signal processor 240 can perform repetitive transmission of the PUCCH and PUSCH to support CE.

[0053] The PUCCH may be interpreted as an UL physical channel used to transmit UCI (Uplink Control Information). The UCI can be transmitted by either the PUCCH or the PUSCH depending on the situation. Note that the DCI (Downlink Control Information) may always be transmitted by the PDCCH and does not necessarily have to be transmitted via the PDSCH.

[0054] 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).

[0055] In addition, the timing and radio resources for transmitting the PUCCH may be controlled by DCI in the same way as the data channel.

[0056] Furthermore, five types of formats may be defined for the PUCCH. Specifically, the formats may differ in either the number of information bits transmitted by the PUCCH or the number of symbols (OFDM symbols) allocated to the PUCCH.

[0057] 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.

[0058] The number of information bits of PF0 and PF1 is 2 bits or less (≧2), and the number of information bits of PF2 to PF4 is greater than 2 bits (>2).

[0059] In this embodiment, as described above, the gNB 100 can transmit multiple antenna beams, specifically, beams BM. The control signal and reference signal processing unit 240 can transmit a PUCCH corresponding to the beams BM transmitted from the gNB 100. In this embodiment, the control signal and reference signal processing unit 240 constitutes a transmission unit.

[0060] The PUCCH corresponding to the beam BM may refer to a PUCCH transmitted using a time resource corresponding to the beam BM selected when the gNB 100 transmits a signal, since time and frequency resources to which the PUCCH is assigned are determined for each of a plurality of antenna beams. In other words, the control signal and reference signal processing unit 240 can transmit a PUCCH (including repetitions) using a time resource corresponding to the beam BM selected when the gNB 100 transmits a signal.

[0061] Furthermore, in this embodiment, the control signal and reference signal processing unit 240 can receive repetition transmission information indicating at least one of whether repetition of PUCCH is required and the symbol position of the repetition transmission from the gNB 100. In this embodiment, the control signal and reference signal processing unit 240 constitutes a receiving unit.

[0062] Specifically, the control signal and reference signal processor 240 can receive the PUCCH-Config included in the system information (specifically, SIB1) transmitted from the gNB 100. The PUCCH-Config may be included in the BWP-UplinkDedicated, which may be included in the ServingCellConfig. Furthermore, the ServingCellConfig may be included in the SIB1.

[0063] The PUCCH-Config may include the starting symbol position of the repetition (startingSymbolIndexforRepetition) and the difference (slotOffset) between adjacent repetitions in the time direction (repetition n and repetition n+1). However, the slotOffset may not be essential. An example of the configuration of the PUCCH-Config will be described later.

[0064] Furthermore, the control signal and reference signal processor 240 can also receive information that dynamically notifies the contents of the PUCCH repetition.

[0065] Specifically, the control signal / reference signal processor 240 can receive DCI or MAC-CE (Control Element) that notifies the resource position of repetition, whether or not to perform repetition and / or the number of times of repetition, etc. Configuration examples of the DCI and MAC-CE will be described later.

[0066] The encoding / decoding unit 250 performs data division / concatenation and channel coding / decoding for each predetermined communication destination (gNB100 or another gNB).

[0067] 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.

[0068] 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 HARQ.

[0069] The control unit 270 controls each functional block constituting the UE 200. In particular, in this embodiment, the control unit 270 controls repetition of PUCCH transmission.

[0070] Specifically, the control unit 270 can assume the symbol position of the PUCCH repetition based on explicit or implicit notification. More specifically, the control unit 270 can assume the symbol position on the slot (see FIG. 3) (or on the radio frame or subframe) used for the PUCCH repetition. Note that this symbol position may be the start symbol position of the repetition, or may be a specific symbol used for the repetition (for example, the last symbol position).

[0071] For example, explicit notification may mean that, as described above, control unit 270 may assume the symbol position of PUCCH repetition based on the PUCCH-Config. Alternatively, as described above, control unit 270 may assume the symbol position of PUCCH repetition based on DCI or MAC-CE.

[0072] For example, the implicit notification means that the control unit 270 may assume the symbol position of the PUCCH repetition based on the number of beams BM transmitted by the gNB 100 (which can be determined from ssb-PositionsInBurst).

[0073] Specifically, the control unit 270 can assume that PUCCHs corresponding to the number of beams BM transmitted by the gNB 100 are arranged consecutively on the slot.

[0074] Furthermore, when PUCCH repetition is configured (when nrofSlots in PUCCH-Config are n2, n4, n8), control unit 270 may assume that PUCCHs equal to the number of beams BMs multiplied by the number of repetitions are consecutively arranged on slots, and assume that the PUCCH repetition timing for UE 200 occurs at the timing after the number of beams BMs. nrofSlots indicates the number of PUCCH slots for PF1, 3, and 4. More specific examples of assumed positions of PUCCH and repetition will be described later.

[0075] Furthermore, the control unit 270 may assume information indicating the interval between multiple PUCCH repetitions (repeated transmissions) based on explicit or implicit notification.

[0076] Specifically, control unit 270 may estimate a slot difference between repetitions (the difference between repetition n and repetition n+1) that is common to each repetition or multiple repetitions. As described above, the slot difference may be explicitly notified by PUCCH-Config, or may be implicitly estimated based on a slot difference that is defined in advance.

[0077] Furthermore, to achieve more efficient PUCCH repetition, the control unit 270 may assume that at least one of PUCCH and repetition is allocated to uplink resources corresponding to other beams BM (neighboring antenna beams) whose transmission directions are close to the beam BM.

[0078] The control unit 270 may assume that at least one of PUCCH and repetition is allocated to the uplink resource corresponding to the adjacent antenna beam, for example, in accordance with bitmap information transmitted from the gNB 100. The bitmap information may be included in the PUCCH-Config or may be notified to the UE 200 by another information element. Alternatively, the control unit 270 may assume the uplink resource corresponding to the adjacent antenna beam based on initial settings or the like, without relying on the bitmap information.

[0079] The multiple beams BM transmitted by gNB100 are transmitted (radiated) in different directions in at least one of the horizontal and vertical directions, but a nearby antenna beam may be interpreted as an antenna beam whose radiation direction is adjacent to the beam BM received by UE200 in at least one of the horizontal and vertical directions.

[0080] However, the adjacent antenna beam is not necessarily limited to an antenna beam adjacent to the beam BM received by the UE 200, but may be, for example, an antenna beam further adjacent to the adjacent antenna beam.

[0081] (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 regarding the repetition of the PUCCH.

[0082] (3.1) Basic operation First, a description will be given of operations related to PUCCH repetition in accordance with 3GPP Release-15 and 16. FIG.

[0083] As shown in Figure 5, PUCCH repetition is supported for PUCCH Format (PF) 1, 3, and 4. Repetition is assigned to consecutive slots and can consist of multiple consecutive symbols, but the PUCCH symbols assigned to each slot are the same. Frequency hopping for each slot is also supported (the vertical direction of the border corresponds to the frequency direction).

[0084] Repetition is not supported for PF0 and 2. Note that one frame in Figure 5 corresponds to one symbol (same below). Figure 5 shows an example where PF1, 3, and 4 (long format) have four symbols, and PF0 and 2 (short format) have two symbols.

[0085] Also, the bottom of Figure 5 shows an example of mapping between beams BM and PUCCH when gNB100 (BS) radiates eight beams BM (#0 to 7) in different directions (horizontal direction).

[0086] As described above, this embodiment supports Coverage Enhancement (CE). To implement CE, it is desirable to improve the performance of the PUCCH.

[0087] One possible method for achieving CE is PUCCH repetition in the time direction. However, when the gNB 100 supports multiple antenna beams while following the PUCCH specifications in 3GPP Release-15 and 16, there are restrictions on the PUCCH repetition configuration, as shown in the example at the bottom of Figure 5, making it difficult to achieve a more efficient PUCCH repetition configuration.

[0088] The following describes an example of the operation of the network and UE 200 that can eliminate such constraints and achieve more efficient PUCCH repetition.

[0089] (3.2) Operation overview In the following operation example, PUCCH repetitions are more efficiently mapped to multiple beams BM transmitted from gNB100.

[0090] Specifically, operation examples 1 to 3 realize efficient mapping of PUCCH repetitions to beam BM.

[0091] (Operation example 1): In order to map PUCCH repetitions (hereinafter simply abbreviated as repetitions as appropriate) to multiple beams BM, the following operations are possible.

[0092] (i): Support for repetition in PF 0 and 2 (ii): Setting the start symbol of the repetition (iii): Setting the slot for the repetition symbol Note that (i) to (iii) may be notified to UE 200 explicitly or implicitly from the network.

[0093] (Operation example 2): PUCCH and repetition are assigned to uplink resources corresponding to different antenna beams adjacent to a specific antenna beam.

[0094] In this case, the resource allocation method in the time direction and frequency direction may be as follows.

[0095] (Time direction) (i): Set PUCCH and repetition resources in the same way as in Operation Example 1 (ii): For repetition, associate with SSB index (frequency direction) (i): Instead of frequency hopping between slots, frequency hopping between repetitions is set. (ii): Set an arbitrary resource block (RB) for each repetition (Example 3): Dynamically set the repetition method.

[0096] (3.2.1) Example 1 In this operation example, repetition is mapped to beams BM (antenna beams) from multiple gNBs 100. Specifically, the following mapping configuration example is given.

[0097] Fig. 6 shows a configuration example (part 1) of repetition mapping to multiple antenna beams according to Operation Example 1. Fig. 7 shows a configuration example (part 2) of repetition mapping to multiple antenna beams according to Operation Example 1. Fig. 8 shows a configuration example (part 3) of repetition mapping to multiple antenna beams according to Operation Example 1.

[0098] The patterns in Figures 6 to 8 correspond to the beams BM (#0 to 7) shown in Figure 5. Also, as shown in Figures 6 to 8, such mapping may be supported in PF1, 3, and 4 (long format) and PF0 and 2 (short format).

[0099] In the configuration example (part 1) of FIG. 6, PUCCH (including repetition) is repeatedly mapped to consecutive beams BM #0 to #7.

[0100] In the configuration example (part 2) of Figure 7, PUCCHs (including repetitions) are repeatedly mapped to consecutive beams BM #0 to 7, and PUCCHs that require repetition are mapped to empty symbols. For example, in the case of PF1, 3, and 4, the last (rightmost) PUCCH (4 symbols) in the time direction is mapped to beam BM #3. Similarly, in the case of PF0 and 2, the last six PUCCHs (2 symbols) are mapped to beam BM #3 and 6.

[0101] In the configuration example (part 3) of Fig. 8, similar to part 1, PUCCH (including repetition) is repeatedly mapped to consecutive beams BM #0 to #7, but downlink (DL) slots are allocated in between. UE 200 may assume repetitions such as those shown in Figs. 6 to 8.

[0102] To achieve such mapping, a symbol (start symbol) at which a repetition starts may be specified. Specifically, a start symbol may be specified for each repetition or may be common to multiple repetitions, and may be indicated by the symbol number or the difference in symbols between repetitions.

[0103] To achieve such mapping, the slots of the repetition symbols may be specified. Specifically, the slot difference between adjacent repetitions, which is common to each repetition, may be specified. For example, the difference (slot difference) between repetition n and repetition n+1 may be specified.

[0104] FIG. 9 shows an example of defining the start symbol of a repetition and the slot difference between repetitions according to the first operational example.

[0105] 9, the symbol at which the repetition starts (start symbol) is specified by a combination of a symbol number and a slot (for example, Start symbol #0, Slot #n+3). However, specifying the slot is not necessarily required.

[0106] Alternatively, a difference in time resources between repetitions (for example, 38 symbols) may be specified as shown in Fig. 9. The difference in time resources may be information indicating the interval between adjacent repetitions in the time direction, and may be specified based on slots or symbols.

[0107] (3.2.1.1) Explicit Notification Example The UE 200 may assume the repetition mapping as described above, but the assumption may be subject to explicit notification from the network.

[0108] For example, the NG-RAN 20 (specifically, the gNB 100) can explicitly notify information regarding repetition mapping using the PUCCH-Config.

[0109] Fig. 10 shows an example of the configuration of PUCCH-Config according to Operation Example 1. As shown in Fig. 10, information about repetition mapping may be added to the PUCCH-Resource field included in PUCCH-Config, or the PUCCH-format1, PUCCH-format2, PUCCH-format3, or PUCCH-format4 field.

[0110] Specifically, the PUCCH-Resource field or the PUCCH-format field may include a starting symbol (startingSymbolIndexforRepetition) that is common to multiple repetitions and a slot difference (slotOffset) between the repetitions (see the solid line box).

[0111] Furthermore, when specifying the starting symbol for each repetition, the starting symbol (startingSymbolIndexforRepetition1 to 3) and the slot difference between the repetitions (slotOffset1 to 3) may be included (see the dotted line frame).

[0112] (3.2.1.2) Implicit Notification Example Furthermore, the UE 200 may assume the above-described mapping of repetitions according to implicit notification, instead of explicit notification using the PUCCH-Config or the like as described above.

[0113] For example, UE200 may assume the mapping position of the repetition based on the number of beams BM transmitted by gNB100.

[0114] FIG. 11 is a diagram illustrating that the UE 200 according to the first operation example assumes the mapping position of the repetition with reference to the number of beams BM.

[0115] As shown in FIG. 11, the UE 200 may assume that the PUCCHs are arranged contiguously according to the number of beams BM (which can be determined from ssb-PositionsInBurst) according to the number of beams BM (8).

[0116] Furthermore, when PUCCH repetition is set (when nrofSlots in PUCCH-Config are: n2, n4, n8), UE200 may assume that PUCCHs equal to the number of beam BMs multiplied by the repetition number are consecutively placed on slots, and may assume that at the timing after the number of beam BMs, there is a repetition timing for the PUCCH to which the beam BM received by UE200 is mapped.

[0117] The timing of repetition (Start symbol index) may be derived from the starting symbol (startingSymbolIndex), number of symbols (noofSymbols), etc. of the PUCCH included in the PUCCH-Config, as shown in FIG.

[0118] Specifically, the Start symbol index can be derived by startingSymbolIndex + {A mod 14}, where A is the number of symbols between repetitions (#n to #n+1), as shown in Fig. 11. Also, as shown in Fig. 11, A may be derived using the values ​​of B to F.

[0119] If a DL slot is inserted between consecutively arranged PUCCH slots, the DL slot may be taken into consideration. For example, the number of DL slots may be added to Slot#n+C.

[0120] (3.2.2) Example 2 In this operation example, the PUCCH and repetition are allocated to PUCCH resources using a different antenna beam that is adjacent to a specific antenna beam (for example, the antenna beam used to transmit the SSB received by the UE 200).

[0121] As described above, the PUCCH and repetition resources are configured in the same manner as in the first operational example, and the repetition may be associated (linked) with the SSB index.

[0122] 12 shows an example of the relationship between antenna beams and PUCCH repetition according to operation example 2. UE 200 may determine that PUCCHs are arranged consecutively on slots for the number of beams BM transmitted by gNB 100 (which can be determined from ssb-PositionsInBurst).

[0123] 12, when the SSB index is #2 (i.e., antenna beam #2), the gNB 100 can specify #1, 3, and 6 as target antenna beams for repetition using, for example, a bitmap. When the UE 200 receives the antenna beam #2 based on the bitmap, the UE 200 may transmit repetition at the resource positions (slots or symbols) of the PUCCH mapped to the antenna beams #1, 3, and 6.

[0124] Alternatively, based on the measurement results of the SSB, UE200 may use the top SSB(s) with the highest measurement quality as a reference and transmit the repetition at a PUCCH resource position where a different antenna beam is used that is close to the antenna beam used to transmit the SSB.

[0125] Instead of using SSBs with high measurement quality, SSBs with measurement quality exceeding a predetermined threshold may be used as the reference.

[0126] Furthermore, in this operation example, in the frequency direction, frequency hopping between repetitions may be set instead of frequency hopping between slots.

[0127] Specifically, inter-repetition frequency hopping may be configured instead of interslotFrequencyHopping. Like interslotFrequencyHopping, inter-repetition frequency hopping changes the frequency position at even or odd RB positions. Like secondHopPRB, odd-numbered RB positions may be configured by a PRB-ID or an offset from the startingPRB. secondHopPRB is also included in PUCCH-Config and indicates the index of the first PRB (Physical Resource Block) after PUCCH frequency hopping (second hop).

[0128] Furthermore, as a setting in the frequency direction, any RB may be set for each repetition. As a setting method, for example, the position of the RB for each repetition may be set as the content of UCCH-Resource included in PUCCH-Config.

[0129] Regarding the repetition setting, the UE 200 may report, for example, the following capabilities to the network.

[0130] · PUCCH repetition availability Number of repetitions available - Possibility of assuming consecutive PUCCH allocation (by implicit notification) Furthermore, the UE 200 may report the frequencies that the UE 200 supports to the network in one of the following ways.

[0131] Reports compatibility for all frequencies (compatibility as UE200) - Reports compatibility for each frequency Report availability for each FR1 and FR2 Furthermore, the UE 200 may report the duplex modes supported by the UE 200 to the network by any of the following methods.

[0132] Reports whether UE200 supports all duplex methods - Reports whether each duplex method (TDD / FDD) is supported (3.2.3) Example 3 In the operation examples 1 and 2, the repetition of the PUCCH is determined by semi-static notification, but the method and / or content of the repetition may be set dynamically.

[0133] For example, in the case of the operational example 1, the repetition may be dynamically set by the following method.

[0134] The location of the resource used for repetition is notified explicitly or implicitly. The gNB 100 dynamically notifies the UE 200 of the presence or absence of repetition and / or the number of repetitions (corresponding to nrofSlots) depending on the reception status of the PUCCH from the UE 200. In the case of the second operational example, the repetition may be dynamically set by the following method.

[0135] UE 200 assumes that PUCCHs are arranged consecutively for the number of antenna beams (which can be determined from ssb-PositionsInBurst). The gNB 100 dynamically notifies the UE 200 of the necessity of repetition and / or the repetition position (the position associated with the SSB index). Such dynamic notification can be realized by DCI or MAC-CE, as described above. For example, the notification may be realized by DCI format 1_0 or 1_1, MAC-CE, or a combination of these.

[0136] FIG. 13 shows an example of dynamic notification of PUCCH repetition using DCI format 1_0 or 1_1 according to the third operation example.

[0137] As shown in FIG. 13, when DCI format 1_0 or 1_1 is used, in addition to the PUCCH resource indicator and PDSCH-to-HARQ feedback timing indicator (k), it is possible to specify whether or not repetition is performed and / or the number of repetitions.

[0138] FIG. 14 shows an example of dynamic notification of PUCCH repetition using MAC-CE according to the third operation example.

[0139] As shown in FIG. 14, the presence or absence of repetition and / or the number of repetitions can be specified using the reserved bit (R) of the MAC-CE Reserved index, PUCCH spatial relation Activation / Deactivation, or SPCSI reporting on PUCCH Activation / Deactivation.

[0140] (4) Actions and Effects According to the above-described embodiment, the following advantageous effects can be obtained: Specifically, the UE 200 can control the repetition of the PUCCH and can estimate the position of the start symbol of the repetition based on explicit or implicit notification.

[0141] Therefore, based on the notification, the UE 200 may assume a more efficient repetition that takes into account compatibility with multiple beams BM. In other words, the UE 200 can realize a more efficient PUCCH repetition when multiple antenna beams from the gNB 100 are used.

[0142] In this embodiment, the UE 200 may assume information indicating intervals between multiple repetitions based on explicit or implicit notification. Therefore, the UE 200 can easily assume the positions of the repetitions based on information indicating the intervals between the repetitions, such as slot differences.

[0143] In this embodiment, UE200 may assume that at least one of PUCCH and repetition is assigned to an uplink resource corresponding to an adjacent antenna beam whose transmission direction is close to a specific antenna beam transmitted from gNB100.

[0144] This makes it possible to increase the probability of successful reception of PUCCH at gNB100, making it possible to achieve CE more quickly.

[0145] In this embodiment, the UE 200 can receive repetition transmission information indicating at least one of whether repetition is required and the symbol position of the repetition from the gNB 100. As described above, the repetition transmission information can be transmitted by DCI or MAC-CE.

[0146] Therefore, the UE 200 can assume an appropriate repetition based on the received repetition transmission information.

[0147] In this way, a network including UE200 and gNB100 can realize efficient PUCCH repetition, which can contribute to providing stable CE.

[0148] (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.

[0149] For example, in the above-described embodiment, CE is assumed, but the above-described PUCCH repetition may be performed regardless of whether CE is provided.

[0150] Furthermore, in the above-described embodiment, the PUCCH is taken as an example, but if there is an uplink control channel that transmits UCI and the like, repetition may be performed for that uplink control channel.

[0151] Furthermore, the block diagram (FIG. 4) 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. Furthermore, the method of 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 also be realized by combining the single device or the multiple devices with software.

[0152] 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.

[0153] Furthermore, the above-described UE 200 may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 15 is a diagram showing an example of the hardware configuration of the UE 200. As shown in Fig. 15, the UE 200 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.

[0154] 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.

[0155] The functional blocks of the UE 200 (see FIG. 4) are realized by any hardware element of the computer device or a combination of the hardware elements.

[0156] In addition, each function in UE200 is realized by loading specified software (programs) onto hardware such as processor 1001, memory 1002, etc., so that processor 1001 performs calculations, controls communication by communication device 1004, and controls at least one of reading and writing data in memory 1002 and storage 1003.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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).

[0163] 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).

[0164] 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.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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).

[0173] 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).

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0179] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0180] 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.

[0181] 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.

[0182] 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)).

[0183] 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.

[0184] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0185] 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.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] 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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] 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.

[0201] 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.

[0202] 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.

[0203] 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.

[0204] 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.

[0205] 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."

[0206] 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.

[0207] 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.

[0208] The reference signal may also be abbreviated as Reference Signal (RS), and may also be called a pilot depending on the applicable standard.

[0209] 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."

[0210] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] 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.

[0215] 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."

[0216] 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]

[0217] 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 receiving unit for receiving downlink control information; a transmitter for transmitting an uplink control channel; a control unit that controls repeated transmission of the uplink control channel in a short format of the uplink control channel; Equipped with The control unit In the repeated transmission, an interval between each uplink control channel in a time direction is assumed, dynamically setting the number of repeated transmissions based on the downlink control information; The short format is format 0 of the uplink control channel. Terminal.

2. A wireless communication system including a wireless base station and a terminal, the radio base station includes a transmitter that transmits downlink control information; The terminal a receiving unit that receives the downlink control information; a transmitter for transmitting an uplink control channel; a control unit that controls repeated transmission of the uplink control channel in a short format of the uplink control channel; Equipped with The control unit In the repeated transmission, an interval between each uplink control channel in a time direction is assumed, dynamically setting the number of repeated transmissions based on the downlink control information; The short format is format 0 of the uplink control channel. Wireless communication system.

3. receiving downlink control information; transmitting an uplink control channel; controlling repeated transmission of the uplink control channel in a short format of the uplink control channel; Including, In the controlling step, In the repeated transmission, assuming an interval between each uplink control channel in a time direction, and dynamically setting the number of repeated transmissions based on the downlink control information; The short format is format 0 of the uplink control channel. A wireless communication method in a terminal.

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