terminal

Abstract

To provide a terminal that copes with more efficient physical downlink data channel reception according to the coverage enhancement, for realization of coverage enhancement in New Radio (NR).SOLUTION: A radio communication system includes a terminal 200 comprising: a receiving unit for receiving physical downlink data channels; and a controlling unit that assumes that physical downlink data channels assigned in the same symbol or slot in the time direction are also assigned in the frequency direction in the symbol or slot.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] This disclosure relates to a terminal that receives a physical downlink data channel.

Background Art

[0002] The 3rd Generation Partnership Project (3GPP) has been standardizing the 5th generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and is also promoting the standardization of the next generation, such as Beyond 5G, 5G Evolution or 6G.

[0003] For example, in 3GPP Release-17, it has been agreed to study coverage enhancement (CE) in NR (Non-Patent Document 1).

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

[0005] In order to achieve coverage expansion in NR, as a result of evaluating the link budget (Hardware link budget) of physical channels (PDSCH (Physical Downlink Shared Channel), PUSCH (Physical Uplink Shared Channel), PDCCH (Physical Downlink Control Channel), and PUCCH (Physical Uplink Control Channel)), it has been found that there is room for improvement, at least for PDSCH (physical downlink data channel).

[0006] Regarding the downlink (DL) transmission power of a radio base station (gNB), generally, since the power spectral density (PSD: Power Spectrum Density) is constant regardless of the bandwidth of the transmission signal, the total transmission power increases as the number of resource blocks (RBs) allocated to the resources to be transmitted increases.

[0007] In NR, the time - frequency resources of PDSCH can be flexibly allocated. For example, it is possible to increase the total transmission power by increasing the number of RBs and decreasing the coding rate.

[0008] The coding rate is determined for each Modulation and Coding Scheme (MCS) index, and the transport block (TB) size is determined by the MCS and the amount of allocated resources. Therefore, even if the amount of allocated resources is increased, it will not be below the coding rate of MCS = 0. Furthermore, increasing the amount of allocated resources to increase the total transmission power will increase the TB size, resulting in waste of resources when sending small - sized data.

[0009] Therefore, it is desirable to be able to transmit small - sized data with a lower error rate by making use of the allocated resources.

[0010] Therefore, the following disclosure has been made in view of such a situation, and an object thereof is to provide a terminal that can support more efficient reception of PDSCH corresponding to coverage extension.

[0011] One aspect of the present disclosure is a terminal (UE200) including a receiving unit (radio signal transceiver unit 210) that receives a physical downlink data channel, and a control unit (control unit 270) that assumes that the physical downlink data channel is repeated in the frequency direction within the same time domain.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0013] Hereinafter, embodiments will be described with reference to the drawings. Note that the same or similar reference numerals are assigned to the same functions and configurations, and the description thereof will be omitted as appropriate.

[0014] (1) Overall schematic configuration of the wireless communication system FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10 according to this embodiment. The wireless communication system 10 is a wireless communication system compliant with 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).

[0015] Note that the wireless communication system 10 may also be a wireless communication system compliant with a system called Beyond 5G, 5G Evolution, or 6G.

[0016] NG-RAN 20 includes a radio base station 100A (hereinafter, gNB 100A) and a radio base station 100B (hereinafter, gNB 100B). Note that the specific configuration of the wireless communication system 10 including the number of gNBs and UEs is not limited to the example shown in FIG. 1.

[0017] NG-RAN 20 actually includes a plurality of NG-RAN Nodes, specifically, gNBs, and is connected to a core network (5GC, not shown) compliant with 5G. Note that NG-RAN 20 and 5GC may be simply expressed as "network".

[0018] gNB100A and gNB100B are radio base stations compliant with NR and perform wireless communication with UE200 according to NR. gNB100A, gNB100B, and UE200 can support Massive MIMO that generates more directive beams by controlling radio signals transmitted from a plurality of antenna elements, Carrier Aggregation (CA) that bundles and uses a plurality of Component Carriers (CCs), and Dual Connectivity (DC) that simultaneously communicates between the UE and each of a plurality of NG-RAN Nodes.

[0019] Wireless communication system 10 supports FR1 and FR2. The frequency bands for each FR are as follows.

[0020] · FR1: 410 MHz to 7.125 GHz · FR2: 24.25 GHz to 52.6 GHz In FR1, Sub-Carrier Spacing (SCS) of 15, 30, or 60 kHz is used, and a bandwidth (BW) of 5 to 100 MHz may be used. FR2 is at a higher frequency than FR1, SCS of 60 or 120 kHz (240 kHz may be included) is used, and a bandwidth (BW) of 50 to 400 MHz may be used.

[0021] Furthermore, wireless communication system 10 may also support a frequency band higher than the frequency band of FR2. Specifically, wireless communication system 10 can support a frequency band exceeding 52.6 GHz and up to 114.25 GHz.

[0022] Also, 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).

[0023] FIG. 2 shows a configuration example of a radio frame, a subframe, and a slot used in the wireless communication system 10.

[0024] As shown in FIG. 2, one slot is composed of 14 symbols, and the larger (wider) the SCS is, the shorter the symbol period (and slot period) becomes. Note that the number of symbols constituting one slot does not necessarily have to be 14 symbols (for example, 28, 56 symbols). Also, the number of slots per subframe may vary depending on the SCS. Further, although not shown, a wider interval, for example, 480 kHz, 960 kHz, etc. may be used for the SCS.

[0025] Note that the time direction (t) shown in FIG. 2 may also be referred to as a time domain, a symbol period, or a symbol time. Also, the frequency direction may also be referred to as a frequency domain, a resource block, a subcarrier, a BWP (Bandwidth part), etc.

[0026] Also, the wireless communication system 10 can support coverage enhancement (CE) that expands the coverage of the cells formed by gNB100A (and gNB100B, the same hereinafter). In coverage enhancement, a mechanism for increasing the reception success rate of various physical channels may be provided.

[0027] In the present embodiment, the wireless communication system 10 (gNB100A) can support repeated transmission of a physical downlink data channel, specifically, a PDSCH (Physical Downlink Shared Channel).

[0028] (2) Functional Block Configuration of Wireless Communication System Next, the functional block configuration of the wireless communication system 10 will be described. Specifically, the functional block configuration of the UE200 will be described.

[0029] FIG. 3 is a functional block configuration diagram of UE200. As shown in FIG. 3, UE200 includes a radio signal transceiver 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 transceiver unit 260, and a control unit 270.

[0030] The radio signal transceiver unit 210 transmits and receives radio signals according to NR. The radio signal transceiver unit 210 supports Massive MIMO, CA that bundles multiple CCs for use, and DC that enables simultaneous communication between the UE and two NG-RAN Nodes respectively.

[0031] Specifically, the radio signal transceiver unit 210 transmits and receives radio signals via various physical channels. In particular, in this embodiment, the radio signal transceiver unit 210 constitutes a receiving unit that receives a physical downlink data channel. Specifically, the physical downlink data channel may be interpreted as a PDSCH (Physical Downlink Shared Channel). The PDSCH may also be referred to as a physical downlink shared channel.

[0032] In addition, the radio signal transceiver unit 210 constitutes a transmitting unit that transmits the UE200's capability information regarding the reception of the physical downlink data channel to the network.

[0033] Specifically, the radio signal transceiver unit 210 can transmit to the network the capability information indicating the ability to handle repetition in the frequency direction of the PDSCH (physical downlink data channel). Note that the UE200's capability information may be interpreted as UE capability information defined in 3GPP TS38.331 and the like.

[0034] The radio signal transceiver unit 210 can transmit UE capability information via a predetermined uplink physical channel. The content of the UE capability information regarding the reception of the PDSCH will be described in more detail later.

[0035] The amplifier unit 220 is composed of a PA (Power Amplifier) / LNA (Low Noise Amplifier), etc. The amplifier unit 220 amplifies the signal output from the demodulation and modulation unit 230 to a predetermined power level. Also, the amplifier unit 220 amplifies the RF signal output from the wireless signal transmission / reception unit 210.

[0036] The demodulation and modulation unit 230 executes data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (such as gNB100A). In the demodulation and modulation unit 230, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) may be applied. Also, DFT-S-OFDM may be used not only for the uplink (UL) but also for the downlink (DL).

[0037] The control signal / reference signal processing unit 240 executes processing related to various control signals transmitted and received by the UE200, and processing related to various reference signals transmitted and received by the UE200.

[0038] Specifically, the control signal / reference signal processing unit 240 receives various control signals transmitted from gNB100A (or gNB100B, the same hereinafter) via a predetermined control channel, for example, the control signal of the radio resource control layer (RRC). Also, the control signal / reference signal processing unit 240 transmits various control signals to gNB100A via a predetermined control channel.

[0039] The control signal / reference signal processing unit 240 executes processing using reference signals (RS) such as Demodulation Reference Signal (DMRS) and Phase Tracking Reference Signal (PTRS).

[0040] The DMRS is a reference signal (pilot signal) known between the base station and the terminal for each terminal, which is used to estimate the fading channel for data demodulation. The PTRS is a reference signal for each terminal aimed at estimating the phase noise that becomes an issue in a high frequency band.

[0041] In addition to the DMRS and the PTRS, the reference signal may include a Channel State Information-Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), and a Positioning Reference Signal (PRS) for position information.

[0042] The channel includes a control channel and a data channel. The control channel includes a Physical Downlink Control Channel (PDCCH), a Physical Uplink Control Channel (PUCCH), a Random Access Channel (RACH, including a Downlink Control Information (DCI) including a Random Access Radio Network Temporary Identifier (RA-RNTI)), and a Physical Broadcast Channel (PBCH), etc.

[0043] The data channel includes a Physical Downlink Shared Channel (PDSCH), a Physical Uplink Shared Channel (PUSCH), etc. The data may mean the data transmitted via the data channel.

[0044] Also, the physical channel may include at least a PDCCH, a PUCCH, a PUSCH, and a PDSCH.

[0045] The encoding / decoding unit 250 performs data segmentation / concatenation, channel coding / decoding, etc. for each predetermined communication destination (such as gNB100A).

[0046] Specifically, the encoding / decoding unit 250 divides the data output from the data transmission / reception unit 260 into a predetermined size and performs channel coding on the divided data. Further, the encoding / decoding unit 250 decodes the data output from the modulation / demodulation unit 230 and concatenates the decoded data.

[0047] The data transmission / reception unit 260 performs the transmission and reception of Protocol Data Unit (PDU) and Service Data Unit (SDU). Specifically, the data transmission / reception unit 260 performs the assembly / disassembly of PDU / SDU in a plurality of layers (such as the Medium Access Control layer (MAC), the Radio Link Control layer (RLC), and the Packet Data Convergence Protocol layer (PDCP)). Further, the data transmission / reception unit 260 performs error correction and retransmission control of data based on Hybrid automatic repeat request (Hybrid ARQ).

[0048] The control unit 270 controls each functional block constituting the UE 200. In particular, in this embodiment, the control unit 270 can perform various controls related to the physical channel in order to support coverage expansion (CE).

[0049] Specifically, the control unit 270 may assume that the Physical Downlink Shared Channel (PDSCH) is repeated in the frequency direction. That the PDSCH is repeated in the frequency direction may mean that the PDSCH allocated to a certain region (resource such as a symbol or a slot) in the time direction is also allocated a plurality of times in the frequency direction within the region in the time direction.

[0050] That is, the control unit 270 may assume that the PDSCH is repeated in the frequency direction within the same time region.

[0051] The PDSCH (which may also be referred to as a PDSCH resource) repeated in the frequency direction may be adjacent in the frequency direction or may be separated with a certain interval provided. That is, a plurality of PDSCHs may be continuously allocated to adjacent sub-carriers, or may be allocated with some sub-carriers in between.

[0052] In this way, the control unit 270 may assume that the PDSCH is repeated with an interval in the frequency direction, or may assume that the PDSCH is continuously repeated in the frequency direction.

[0053] The control unit 270 may change at least either the modulation and coding scheme (MCS) or the coding rate based on the repetition of the PDSCH in the frequency direction.

[0054] For example, when the number of repetitions of the PDSCH (referred to as the Repetition number) is 4 (that is, 4 PDSCHs are repeated), the coding rate may be 1 / 4 when there is no repetition. Also, the control unit 270 may change the MCS according to the Repetition number or the presence or absence of Repetition. For example, when the number of repetitions of the PDSCH is 2, an MCS three less than the indicated MCS may be set.

[0055] The control unit 270 may assume the repetition (Repetition) of the PDSCH in the frequency direction as described above based on signaling from the network. Specifically, the control unit 270 may assume the repetition of the PDSCH in the frequency direction based on the downlink control information (DCI), the control element of the medium access control layer (MAC-CE), or the signaling of the radio resource control layer (RRC).

[0056] The DCI, MAC-CE, or RRC signaling may include information indicating the presence or absence of repetition in the frequency direction of the PDSCH, the number of repetitions, and the interval between repetitions. Specific examples of such signaling will be described later.

[0057] (3) Operation of the wireless communication system Next, the operation of the wireless communication system 10 will be described. Specifically, the operation related to the reception of the physical downlink data channel (PDSCH) corresponding to coverage expansion (CE) will be described.

[0058] (3.1) Premise In the Study Item set by 3GPP (see RP-193240), the realization of coverage expansion in both the frequency bands of FR1 and FR2 is assumed.

[0059] The target scenarios include service provision from an outdoor (O) gNB to an indoor (I) UE (in the case of FR1), and service provision from an indoor gNB to an indoor UE (in the case of FR2). Also, coverage expansion in urban, suburban, and rural areas (including areas with long-distance communication) is targeted.

[0060] Also, the main target services are VoIP (Voice over IP) and eMBB (enhanced Mobile Broadband).

[0061] Based on such scenarios and target services, as a result of evaluating the link budget (which may also be called the Hardware link budget, MIL) defined by 3GPP for physical channels, specifically, PDSCH, PUSCH, PDCCH, and PUCCH, there is an assumed need for improvement as shown below.

[0062] (FR1) · PUSCH: Approximately 13 dB (eMBB) · PDSCH: Approximately 5 - 6 dB (VoIP and eMBB) ·PDCCH: Approximately 5 dB (VoIP) (FR2) ·PUSCH: Approximately 21 dB (eMBB) ·PDSCH: Approximately 16 dB (VoIP), approximately 8 dB (eMBB) ·PDCCH: Approximately 18 dB (VoIP) Figure 4 shows the MIL evaluation results of the physical channels in FR1. Figure 5 shows the MIL evaluation results of the physical channels in FR2.

[0063] In the following, the operations related to the improvement of PDSCH for supporting coverage expansion will be described.

[0064] Figure 6 shows an example of the relationship between the bandwidth of the transmission signal and the power spectral density (PSD). As shown in Figure 6, regarding the downlink (DL) transmission power of gNB100A (and gNB100B, the same hereinafter), generally, the power spectral density (PSD: Power Spectrum Density) is constant regardless of the bandwidth of the transmission signal. Therefore, the larger the number of resource blocks (RBs) allocated to the resources to be transmitted, the greater the total transmission power.

[0065] In NR, the time-frequency resources of PDSCH can be flexibly allocated. For example, by increasing the number of RBs and reducing the coding rate, it is possible to increase the total transmission power.

[0066] The coding rate is determined for each Modulation and Coding Scheme (MCS) index, and the transport block (TB) size is determined by the MCS and the amount of allocated resources. Therefore, even if the amount of allocated resources is increased, it will not be below the coding rate of MCS = 0. Furthermore, increasing the amount of allocated resources to increase the total transmission power will increase the TB size, resulting in waste of resources when sending small-sized data.

[0067] Therefore, it is desirable to be able to transmit small-sized data with a lower error rate by making use of the allocated resources.

[0068] In order to be able to transmit small-sized data with a lower error rate by utilizing the allocated resources, the following methods can be considered.

[0069] (i) Newly introduce an MCS table with a lower coding rate (ii) Determine the transport block (TB) size from the allocated (partial) resource amount, and repetitively transmit the remaining resources in the frequency direction

[0070] (3.2) Operation overview Hereinafter, an operation example when the method (ii) described above is applied to PDSCH will be described. Thereby, coverage expansion by introducing Repetition in the frequency direction of PDSCH can be realized.

[0071] Specifically, the wireless communication system 10 can execute the following operations.

[0072] ·(Operation example 1): Repetition in the frequency direction of PDSCH ·The PDSCH resources set by DCI are repetitively set in the frequency direction ·The number of repetitions may be arbitrarily set ·The MCS and / or coding rate may be changed according to the number of repetitions ·The interval of repetition may be arbitrarily set ·(Operation example 2):: Method for setting Repetition in the frequency direction of PDSCH ·Notify by DCI (for example, define a new DCI format or expand the field for notifying Frequency Domain Resource Assignment (FDRA)) ·Notify by MAC-CE ·Set by RRC signaling (for example, set using PDSCH-Config) ·(Operation Example 3): UE capability information The UE (terminal) reports its capabilities regarding, for example, the feasibility of the following with respect to Repetition in the frequency direction of the PDSCH. ·Feasibility of Repetition in the frequency direction of the PDSCH ·Number of Repetitions and Repetition interval in the frequency direction of the PDSCH

[0073] (3.3) Operation Example 1 In this operation example, Repetition in the frequency direction is performed to obtain the frequency diversity gain of the PDSCH.

[0074] FIG. 7 shows an example of allocation of PDSCH resources (continuous arrangement) according to Operation Example 1. FIG. 8 shows an example of allocation of PDSCH resources (non - continuous arrangement) according to Operation Example 1. In FIGS. 7 and 8, an example where the number of Repetitions is 4 is shown.

[0075] As shown in FIGS. 7 and 8, in this operation example, the PDSCH resources set by DCI can be repeatedly set in the frequency direction. That is, the PDSCH resources may be repeatedly allocated in the frequency direction.

[0076] Note that the number of Repetitions is not limited to 4, and any number (for example, Number of Repetition = 2, 4, 8, 16) may be set.

[0077] Also, at least one of the MCS and the coding rate may be changed according to the number of Repetitions. For example, when the number of Repetitions = 4, the coding rate may be 1 / 4 of the case without repetition. That is, as the number of Repetitions increases, the coding rate may be decreased.

[0078] Also, as shown in FIG. 7 (continuous arrangement) and FIG. 8 (non - continuous arrangement), the repeated PDSCH resources may be set (allocated) continuously in the frequency direction, or may be set (allocated) with a certain interval (gap).

[0079] UE200 may assume such repetition of the PDSCH in the frequency direction in advance. Specifically, based on the setting method described below, such repetition may be assumed in advance.

[0080] (3.4) Operation Example 2 FIG. 9 shows an example of a communication sequence related to the repetition setting of the PDSCH in the frequency direction.

[0081] As shown in FIG. 9, UE200 may transmit UE capability information indicating the capability of UE200 regarding the repetition of the PDSCH in the frequency direction to the network (S10).

[0082] The UE capability information may include whether it can support repetition in the frequency direction of the PDSCH, the number of repetitions that can be supported, and the repetition interval. Note that only any one of these elements (for example, whether it can support repetition) may be included in the UE capability information. Further, specific examples of the UE capability information will be further described in Operation Example 3.

[0083] The network determines the PDSCH resources based on the received UE capability information and the capabilities on the network side, etc. (S20). Specifically, the network may determine the presence or absence of repetition, the number of repetitions, and the repetition interval of the PDSCH in the frequency direction.

[0084] The network notifies the UE 200 of the information on the determined PDSCH resource (S30). Specifically, as described above, the information may be notified by DCI, MAC-CE, or RRC signaling.

[0085] The UE 200 sets PDSCH reception based on the notified information on the PDSCH resource (S40). Specifically, the UE 200 may perform settings regarding Repetition in the frequency direction of the PDSCH based on the notified information on the PDSCH resource.

[0086] As described above, the network may notify the information on the determined PDSCH resource by DCI, MAC-CE, or RRC signaling, but specifically, it can be notified as follows.

[0087] For example, when notifying by DCI, a new DCI format may be defined, and when scheduling the PDSCH, the presence or absence of Repetition and / or the number of Repetitions may be set accordingly.

[0088] Also, in this case, by expanding the FDRA, in addition to the start position, number of RBs, and / or resource block group (RBG) of the existing allocated resources, the number and / or interval of repetitions may be notified by joint coding.

[0089] Alternatively, a field for notifying the number and / or interval of Repetitions may be newly provided within the existing DCI format.

[0090] When notifying by MAC-CE, a new MAC-CE separate from the existing MAC-CE may be used.

[0091] When signaling by RRC, that is, when notified by RRC parameters, for example, the information element of PDSCH-Config may be used. FIG. 10 shows a configuration example of PDSCH-Config.

[0092] As shown in FIG. 10, the number of repetitions in the frequency direction of PDSCH (for example, ENUMERATED (n2, n4, n8, n16)) may be notified using the field of pdsch-Repetition_FrequencyDomain. Alternatively, any value (for example, INTEGER(0…20)) may be set.

[0093] Also, the repetition interval may be the same as the number of RBs set (allocated) to PDSCH, or may be any value. In the case of any value, as shown in FIG. 10, the repetition interval may be notified using the field of Repetition_offset.

[0094] (3.5) Operation Example 3 The UE capability information regarding the repetition in the frequency direction of PDSCH for UE200 may include the following elements.

[0095] · Whether it can support repetition in the frequency direction of PDSCH · The number of repetitions and / or the repetition interval in the frequency direction of PDSCH Also, UE200 may report at least any one of the following regarding the corresponding frequency.

[0096] · Whether it can support all frequencies collectively (whether the UE can support) · Whether it can support each frequency (band) · Whether it can support each frequency range (FR1, FR2) Furthermore, UE200 may report at least any one of the following regarding the corresponding diversity scheme.

[0097] ·Capability to Support the Response Method as a UE ·Capability to Support Each Response Method (TDD, FDD)

[0098] (4) Operations and Effects According to the above-described embodiments, the following operations and effects can be obtained. Specifically, it can be assumed that the PDSCH is repeated in the frequency direction within the same time domain. Therefore, the UE 200 can easily obtain the frequency diversity gain of the PDSCH.

[0099] In addition, since the TB size can be determined from the (partial) resource amount allocated to the PDSCH, and the remaining resources can be allocated to the Repetition in the frequency direction, it is easy to realize transmitting small-size data with a lower error rate by utilizing the resources allocated to the PDSCH.

[0100] That is, according to the wireless communication system 10, the UE 200 can support more efficient reception of the PDSCH corresponding to coverage expansion, and can realize higher-quality coverage expansion.

[0101] In this embodiment, it can be assumed that the PDSCH is repeated with an interval in the frequency direction. Therefore, the UE 200 can more easily obtain the frequency diversity gain of the PDSCH, and can realize higher-quality coverage expansion.

[0102] In this embodiment, the UE 200 can change at least one of the MCS or the coding rate based on the Repetition of the PDSCH in the frequency direction. Therefore, it is possible to realize efficient data transmission according to the resource amount allocated to the PDSCH.

[0103] In this embodiment, the UE 200 can assume repetition in the frequency direction of the PDSCH based on DCI, MAC-CE, or RRC signaling. Therefore, the UE 200 can surely recognize in advance the setting of the repetition in the frequency direction of the PDSCH.

[0104] In this embodiment, the UE 200 can transmit UE capability information indicating the corresponding ability to the repetition in the frequency direction of the PDSCH to the network. Therefore, the network can set an appropriate PDSCH according to the capability of the UE 200.

[0105] (5) Other embodiments As described above, the embodiments have been described, but it is obvious to those skilled in the art that the present invention is not limited to the description of the embodiments, and various modifications and improvements are possible.

[0106] For example, in the above-described embodiment, the PDSCH has been described as an example, but the PDSCH may be called by another name. Specifically, as long as it is a downlink (DL) direction data channel, it may be called by a name different from the PDSCH.

[0107] Also, in the above-described embodiment, the UE 200 has been described as assuming repetition in the frequency direction of the PDSCH based on DCI. However, when the presence or absence of such repetition is notified by MAC-CE or RRC signaling, the assumption of the repetition does not have to be based on the DCI for PDSCH reception (for example, Format 1_1).

[0108] In addition, the block diagram (FIG. 3) used in the description of the above-described embodiments shows blocks of functional units. These functional blocks (constituent parts) are realized by any combination of at least one of hardware and software. Also, the realization method of each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (e.g., using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0109] Functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, regarded as, notification (broadcasting), notification (notifying), communication (communicating), forwarding, configuration (configuring), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment (assigning), etc. For example, a functional block (constituent part) that functions as transmission is referred to as a transmitting unit or a transmitter. As described above, the realization method is not particularly limited.

[0110] Furthermore, the above-described UE200 may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 11 is a diagram showing an example of the hardware configuration of the UE200. As shown in FIG. 11, the UE200 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, and the like.

[0111] In the following description, the term "apparatus" can be read as a circuit, device, unit, etc. The hardware configuration of the apparatus may be configured to include one or more of each apparatus shown in the figures, or may be configured without including some of the apparatuses.

[0112] Each functional block of UE200 (see FIG. 3) is realized by any hardware element of the computer apparatus or a combination of such hardware elements.

[0113] Also, each function in UE200 is realized by causing a predetermined software (program) to be loaded onto hardware such as processor 1001 and memory 1002, so that processor 1001 performs calculations and controls communication by communication device 1004, or controls at least one of reading and writing data in memory 1002 and storage 1003.

[0114] Processor 1001 controls the entire computer by operating, for example, an operating system. Processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc.

[0115] Also, processor 1001 reads a program (program code), software module, data, etc. from at least one of storage 1003 and communication device 1004 into memory 1002, and executes various processes according to these. As the program, a program for causing a computer to execute at least a part of the operations described in the above embodiments is used. Further, the above various processes may be executed by one processor 1001, or may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

[0116] The memory 1002 is a computer-readable recording medium and may be composed of at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. The memory 1002 may also be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 can store a program (program code), software module, etc. capable of executing the method according to an embodiment of the present disclosure.

[0117] The storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, optical discs such as Compact Disc ROM (CD-ROM), hard disk drives, flexible disks, magneto-optical disks (e.g., compact discs, digital versatile discs, Blu-ray (registered trademark) discs), smart cards, flash memories (e.g., cards, sticks, key drives), floppy (registered trademark) disks, magnetic strips, etc. The 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 media including at least one of the memory 1002 and the storage 1003.

[0118] The communication device 1004 is hardware (transceiving device) for performing communication between computers via at least one of a wired network and a wireless network and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc.

[0119] The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0120] The input device 1005 is an input device that receives external input (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that performs output to the outside (for example, a display, a speaker, an LED lamp, etc.). Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

[0121] Also, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses for each device.

[0122] 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), a Field Programmable Gate Array (FPGA), etc., and some or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0123] Also, the notification of information is not limited to the aspects / embodiments described in this disclosure, and other methods may be used. For example, the notification of information may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or combinations thereof. Also, 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, etc.

[0124] Each aspect / embodiment described in this disclosure may be applied to at least one of systems using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 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), other suitable systems, and next-generation systems extended based thereon. Also, a plurality of systems may be combined (e.g., a combination of at least one of LTE and LTE-A and 5G) and applied.

[0125] The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be reordered as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0126] Specific operations assumed to be performed by a base station in the present disclosure may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station, various operations performed for communication with a terminal can clearly be performed by at least one of the base station and other network nodes other than the base station (for example, but not limited to, MME or S-GW, etc.). Although the case where there is one other network node other than the base station is exemplified above, a combination of a plurality of other network nodes (for example, MME and S-GW) may also be possible.

[0127] Information, signals (such as information) can be output from an upper layer (or lower layer) to a lower layer (or upper layer). They may also be input and output via a plurality of network nodes.

[0128] The input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. The input and output information can be overwritten, updated, or appended. The output information may be deleted. The input information may be transmitted to other devices.

[0129] The determination may be made by a value represented by 1 bit (0 or 1), by a Boolean value (true or false), or by a numerical comparison (for example, comparison with a predetermined value).

[0130] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched and used during execution. Also, the notification of predetermined information (for example, the notification of "being X") is not limited to being explicitly performed, and may be performed implicitly (for example, by not performing the notification of the predetermined information).

[0131] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, hardware description language, or by other names.

[0132] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cables, optical fiber cables, twisted pairs, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared rays, microwaves, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0133] 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., which may be referred to throughout the above description, may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0134] In addition, with regard to the terms described in the present disclosure and the terms necessary for understanding the present disclosure, they 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). Also, the signal may be a message. Further, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

[0135] The terms "system" and "network" used in the present disclosure are used interchangeably.

[0136] Also, the information, parameters, etc. described in the present disclosure may be represented using absolute values, relative values from a predetermined value, or corresponding other information. For example, a radio resource may be indicated by an index.

[0137] The names used for the above-described parameters are not limiting in any way. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting in any way.

[0138] In the present 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. The base station may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0139] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each of the smaller areas can also provide communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0140] The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within this coverage.

[0141] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" may be used interchangeably.

[0142] 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 term.

[0143] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves unmanned (e.g., a drone, a self-driving vehicle, etc.), or a robot (humanoid or unmanned). Note that at least one of the base station and the mobile station also includes a device that does 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.

[0144] Also, the base station in the present disclosure may be read as a mobile station (user terminal, the same hereinafter). For example, for a configuration in which communication between the base station and the mobile station is replaced with communication between a plurality of mobile stations (which may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the base station may be configured as those of the mobile station. Also, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (e.g., "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0145] Similarly, the mobile station in the present disclosure may be read as a base station. In this case, the functions of the mobile station may be configured as those of the base station. The wireless 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 sub-frame. The sub-frame may further be composed of one or more slots in the time domain. The sub-frame may have a fixed time length (e.g., 1 ms) that does not depend on numerology.

[0146] Numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate, for example, at least one of sub-carrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame configuration, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, etc.

[0147] The slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. The slot may be a time unit based on numerology.

[0148] The slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, the mini-slot may be called a sub-slot. The mini-slot may be composed of a smaller number of symbols than the slot. The PDSCH (or PUSCH) transmitted in a time unit larger than the mini-slot may be called PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the mini-slot may be called PDSCH (or PUSCH) mapping type B.

[0149] The radio frame, sub-frame, slot, mini-slot, and symbol all represent time units when transmitting signals. Different names corresponding to each of them may also be used.

[0150] For example, one sub-frame may be called a transmission time interval (TTI), or a plurality of consecutive sub-frames may be called TTI, or one slot or one mini-slot may be called TTI. That is, at least one of the sub-frame and TTI may be the sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. Note that the unit representing TTI may be called a slot, mini-slot, etc. instead of a sub-frame.

[0151] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0152] The TTI may be a transmission time unit such as a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit such as scheduling or link adaptation. When the TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a codeword, etc. are actually mapped may be shorter than the TTI.

[0153] Note that when one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0154] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than the normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0155] Note that the long TTI (e.g., the normal TTI, the subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and the short TTI (e.g., the shortened TTI, etc.) may be read as a TTI having a TTI length less than that of the long TTI and equal to or more than 1 ms.

[0156] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of consecutive subcarriers in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in the RB may be determined based on the numerology.

[0157] Also, the time domain of the RB may include one or more symbols, and may have the length of 1 slot, 1 mini-slot, 1 sub-frame, or 1 TTI. 1 TTI, 1 sub-frame, etc. may each be composed of one or more resource blocks.

[0158] Note that one or more RBs may be referred to as physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc.

[0159] Also, the resource block may be composed of one or more resource elements (REs). For example, 1 RE may be a radio resource area of 1 sub-carrier and 1 symbol.

[0160] The bandwidth part (BWP) (which may also be called partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0161] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). For the UE, one or more BWPs may be set within one carrier.

[0162] At least one of the set BWPs may be active, and the UE may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0163] The structures such as the above-mentioned radio frames, sub-frames, slots, mini-slots, and symbols are merely examples. For example, the number of sub-frames included in a radio frame, the number of slots per sub-frame or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of sub-carriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be variously changed.

[0164] The terms "connected" and "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed". As used in this disclosure, two elements can be considered to be "connected" or "coupled" to each other using at least one of one or more electric wires, cables, and printed electrical connections, and also, as some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, and optical (both visible and invisible) region.

[0165] The reference signal can also be abbreviated as Reference Signal (RS) and may be called Pilot according to the applicable standard.

[0166] The description "based on" used in this disclosure does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0167] The "means" in the configuration of each of the above devices may be replaced with "section", "circuit", "device", etc.

[0168] Any reference in this disclosure to elements using designations 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 way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be employed there, or that the first element must precede the second element in any way.

[0169] In this disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, like the term "comprising". Further, the term "or" used in this disclosure is not intended to be an exclusive disjunction.

[0170] In this disclosure, for example, when articles are added by translation, like a, an and the in English, this disclosure may include that the nouns following these articles are in the plural form.

[0171] As used herein, the terms "determining" and "determination" may encompass a variety of operations. "Determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, and considering something as having been "determined". "Determining" may also include considering something as having been "determined" after receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in a memory), resolving, selecting, choosing, establishing, comparing, etc. That is, "determining" may include considering something as having been "determined" after performing some operation. Also, "determining (determination)" may be read as "assuming", "expecting", "considering", etc.

[0172] As used herein, the term "A is different from B" may mean that "A is different from B from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separate", "coupled", etc. may be interpreted in the same way as "different".

[0173] As described in detail above, it is obvious to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes only and has no restrictive meaning for the present disclosure.

Explanation of Signs

[0174] 10 Wireless communication system 20 NG-RAN 100A, 100B gNB UE 200 210 Wireless signal transceiver 220 Amplifier section 230 Modulation / demodulation section 240 Control signal / reference signal processing section 250 Encoding / decoding section 260 Data transceiver 270 Control section 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

Claims

1. A receiving unit for receiving a physical downlink data channel; a control unit that assumes that the physical downlink data channel assigned to the same symbol or slot in the time direction is also assigned in a frequency direction within the symbol or slot; A terminal comprising:

2. The terminal according to claim 1 , wherein the control unit assumes that the physical downlink data channel is repeated at intervals in the frequency direction.

3. The terminal according to claim 1 , wherein the control unit changes at least one of a modulation and coding scheme and a coding rate based on the repetition in the frequency direction of the physical downlink data channel.

4. The terminal according to claim 1 , wherein the control unit assumes repetition in the frequency direction of the physical downlink data channel based on downlink control information, a control element of a medium access control layer, or signaling of a radio resource control layer.

5. The terminal according to claim 1 , further comprising a transmitting unit for transmitting capability information indicating a capability for handling repetition in the frequency direction of the physical downlink data channel.

6. The terminal according to claim 1 , wherein, when the number of repetitions of the physical downlink data channel is X, the control unit sets the coding rate to 1 / X of the coding rate when there is no repetition.

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