Terminal and wireless communication method

Abstract

One embodiment of a terminal according to the present disclosure is provided with: a reception unit that receives, in a frequency band higher than a specific frequency, a demodulation reference signal for a downlink channel to which at least one of a comb-shaped subcarrier configuration (comb), a cyclic shift, and an orthogonal cover code (OCC) is applied, and a reception unit that receives, in a frequency band higher than the specific frequency, a demodulation reference signal for a downlink channel to which at least one of the comb-shaped subcarrier configuration, the cyclic shift, and the orthogonal cover code (OCC) is applied; and a control unit that controls reception of the downlink channel on the basis of the demodulation reference signal and information notified by high-level signaling.

Description

Cross Reference to Related Applications

[0001] This application is a divisional application of the patent application with application number 201980099155.6, filed on June 11, 2019, and with the title “Terminal and wireless communication method”. TECHNICAL FIELD

[0002] The present disclosure relates to a terminal and a wireless communication method in a next-generation mobile communication system. BACKGROUND

[0003] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further higher-speed data rates, lower delay, and so on (Non-Patent Literature 1). Further, LTE-Advanced (3GPP Rel. 10-14) is standardized for the purpose of further larger capacity, higher density, and so on of LTE (3rd Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0004] A subsequent system of LTE (for example, also referred to as a 5th generation mobile communication system (5G), 5G+, New Radio (NR), 3GPP Rel. 15 onwards, and so on) is also under study.

[0005] Prior Art Documents

[0006] Non-Patent Literature

[0007] Non-Patent Literature 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 SUMMARY

[0008] Problems to be Solved by the Invention

[0009] In a future wireless communication system (e.g., NR beyond Rel. 16), utilization of a frequency band or a frequency range (FR) higher than a certain frequency (e.g., 52.6 GHz) is being studied.

[0010] In the frequency band higher than the certain frequency, it is assumed that phase noise becomes large, and a peak-to-average power ratio (PAPR) has high sensitivity with respect to average power for a peak power.

[0011] However, how to perform communication control (e.g., design of a channel, modulation control, or mapping control, etc.) in the frequency higher than the certain frequency has not been sufficiently studied.

[0012] Therefore, one of the objects of the present disclosure is to provide a terminal and a wireless communication method capable of appropriately performing communication even in a case where a high frequency band is utilized.

[0013] Means for solving the problem

[0014] The terminal of one embodiment of the present disclosure is characterized by including a reception unit that receives, in a frequency band higher than a certain frequency, a demodulation reference signal for a downlink channel to which at least one of a comb-like subcarrier configuration (comb), a cyclic shift, and an Orthogonal Cover Code (OCC) is applied, and a control unit that controls reception of the downlink channel based on the demodulation reference signal and information notified through higher layer signaling.

[0015] Effects of the Invention

[0016] According to one embodiment of the present disclosure, it is possible to appropriately perform communication even in a case where a high frequency band is utilized. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a diagram illustrating an example of an FR.

[0018] Figure 2 is a diagram illustrating an example of a control resource set period corresponding to a subcarrier spacing.

[0019] Figures 3A-3E is a diagram illustrating an example of allocation of a control resource set.

[0020] Figures 4A-4E is a diagram illustrating another example of allocation of a control resource set.

[0021] Figures 5A-5E is a diagram illustrating another example of allocation of a control resource set.

[0022] Figure 6A and Figure 6B is a diagram indicating an example of allocation of DMRS.

[0023] Figure 7 is a diagram indicating an example of setting of TCI state in a specific time unit.

[0024] Figure 8 is a diagram indicating an example of determination method of modulation order in a plurality of periods.

[0025] Figures 9A-9D is a diagram indicating an example of allocation of PDCCH (or DMRS for PDCCH).

[0026] Figure 10 is a diagram indicating an example of allocation of control channel and data channel.

[0027] Figure 11 is a diagram indicating an example of outline structure of wireless communication system of an embodiment.

[0028] Figure 12 is a diagram indicating an example of structure of base station of an embodiment.

[0029] Figure 13 is a diagram indicating an example of structure of user terminal of an embodiment.

[0030] Figure 14 is a diagram indicating an example of hardware structure of base station and user terminal of an embodiment. DETAILED DESCRIPTION

[0031] (FR)

[0032] In NR, utilization of frequency band up to 52.6 GHz (up to 52.6 GHz at the maximum) has been studied. In NR after Rel. 16, utilization of frequency band above 52.6 GHz (above 52.6 GHz) is being studied. In addition, the frequency band can be appropriately renamed as frequency range (frequency range (FR)).

[0033] Figure 1 is a diagram indicating an example of FR. As shown in Figure 1 , FR targeted (FRx (x is an arbitrary character string)) is, for example, 52.6 GHz to 114.25 GHz. In addition, as the frequency range in NR, FR1 is 410 MHz to 7.152 GHz, and FR2 is 24.25 GHz to 52.6 GHz.

[0034] In a frequency band higher than 52.6 GHz, it is assumed that phase noise becomes large and propagation loss becomes large. In addition, it is assumed that at least one of a Peak-to-Average Power Ratio (PAPR) and non-linerity in a PA has high sensitivity with respect to a peak power to average power ratio.

[0035] In view of the above, in a frequency band higher than 52.6 GHz (or, a waveform for above 52.6 GHz), a structure in which a subcarrier spacing is wide (for example, at least one of CP-OFDM and DFT-S-OFDM) is considered.

[0036] In addition, in Rel. 15, although a DL channel (for example, PDCCH and the like) is designed based on an OFDM waveform, in a frequency band higher than 52.6 GHz, it is also assumed that a single carrier-based channel design is studied.

[0037] The present applicant has conceived the present application in view of a point of communication control different from the past in a frequency band of a specific frequency (for example, above 52.6 GHz).

[0038] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In addition, the first to third modes below can be used individually, or at least two of them can be combined and applied.

[0039] In addition, in the present embodiment, not only can it be applied to the above FRx (for example, a specific frequency range of above 52.6 GHz), but also it can be applied to the existing FR1 and FR2.

[0040] (First Mode)

[0041] In the first mode, resource allocation of a downlink channel is described. In addition, although a downlink control channel (for example, PDCCH) is described as an example of the downlink channel, the downlink channel to which the present application can be applied is not limited to PDCCH, and can be applied to other downlink channels (for example, PDSCH and the like). In addition, it is not limited to a downlink channel, and can be applied to an uplink channel (for example, PUCCH, PUSCH, and the like).

[0042] The allocation direction in each region can be applied individually or in combination of at least two.

[0043] <Time domain>

[0044] The time-domain resource allocation (TDRA) of the control resource set can also be determined based on at least one of a unit shorter than a slot (e.g., a sub-slot level or a half-slot level) and a specific slot unit (e.g., an x-slot level (X≥1)). In addition, a slot can also be composed of a specific number of symbols.

[0045] For example, in the case of a normal cyclic prefix (NCP), one slot can also be composed of 14 symbols, and in the case of an extended cyclic prefix (ECP), one slot can also be composed of 12 symbols. Of course, the number of symbols constituting a slot is not limited thereto.

[0046] Figure 2 is a diagram showing an example of the duration of the control resource set (CORESET Duration) in each subcarrier spacing. In Figure 2 , 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz, 960 kHz, 1920 kHz, and 3840 kHz are exemplified as subcarrier spacings, but other subcarrier spacings can also be defined. In addition, Figure 2 The values shown in are examples and are not limited thereto.

[0047] For example, the maximum value of the duration of the control resource set (or the region to which the control resource set is allocated) up to a specific subcarrier spacing can be a first value. Here, in the case where the subcarrier spacing is 120 kHz or less (15 kHz, 30 kHz, 60 kHz, 120 kHz), the first value can be 3 symbols. That is, in the case where the subcarrier spacing is 120 kHz or less, the allocation region of the control resource set can be set to 3 symbols or less (up to 3 symbols).

[0048] On the other hand, in a case where the subcarrier spacing is greater than a certain value (for example, 120 kHz), the maximum value of the duration of the control resource set can also be a second value that is greater than the first value. For example, the second value can be at least one of more than 3 symbols (for example, a sub-slot), a half slot, a slot, and multiple slots. That is, in a case where the subcarrier spacing is greater than 120 kHz, the allocation region of the control resource set can also be set to at least one of x symbols or less (for example, x > 3), a half slot or less, 1 slot or less, and multiple slots or less.

[0049] Further, in a case where the subcarrier spacing is 120 kHz or less, the maximum value of the duration of the control resource set can also be set commonly. In a case where the subcarrier spacing is greater than 120 kHz, the maximum value of the duration of the control resource set can also be set separately per subcarrier spacing (or, per each part of the subcarrier spacing). For example, as the subcarrier spacing becomes higher, the maximum number of symbols or slots that can be allocated for the control resource set can also be set to be more.

[0050] Thus, in a high frequency band (for example, Above 52.6 GHz) in which the difference in the subcarrier spacing becomes large, the allocation region of the control resource set (or, PDCCH) can be flexibly set according to the subcarrier spacing (or, symbol length).

[0051] In a certain subcarrier spacing, a case where the PDCCH (or, control resource set) is used in more than 1 slot is also envisaged. At this time, the resource allocation in the time domain of the PDCCH in multiple slots (or, different slots) can also be set to be the same. Or, the resource allocation in the time domain of the PDCCH in multiple slots can also be set separately (for example, differently).

[0052] Further, within a slot, the resource allocation in the time domain of the PDCCH (or, control resource set) can be configured continuously or discontinuously. Further, in different slots (for example, cross slots), the resource allocation in the time domain of the PDCCH (or, control resource set) can be configured continuously or discontinuously.

[0053] Further, the control resource set can be configured (transmission method 1) across (or, across) the boundary of a certain time unit. The certain time unit can also be a slot. Or, the PDCCH can also be repeated in a certain time unit (transmission method 2). The repetition of the PDCCH in a slot unit can be referred to as PDCCH repetition with slot aggregation.

[0054] Which of the two application transmission methods (also known as transmission type or transmission mode) 1 and 2 is used can be defined in the specification or configured by the terminal from the network (e.g., the base station) through higher-layer signaling.

[0055] Furthermore, beam cycling can also be supported in units of specific symbols (or specific time slots). Information related to the unit of beam cycling (e.g., number of symbols) can be communicated to the UE from the base station via higher-layer signaling, or it can be defined in the specification.

[0056] For example, the unit of beam looping can also be determined based on (or referenced to) a specific subcarrier spacing value (e.g., μ). As another example, the unit of beam looping can also be determined by 2... （μ / μ3） The number of symbols obtained. μ is the subcarrier spacing of the transmit control resource set, and μ3 (=3) can also be μ corresponding to a subcarrier spacing of 120kHz.

[0057] Furthermore, within each subcarrier interval, a specific number (e.g., X symbol number) of decall reference signals can also be time-multiplexed (TDM) with the PDCCH. These decall reference signals can also be referred to as the PDCCH decall reference signals (DMRS). Information regarding the number of symbols allocated to the DMRS can be defined in the specification or communicated from the base station to the terminal via higher-layer signaling, etc.

[0058] Furthermore, the number of symbols configured for DMRS within a specific time unit (e.g., a time slot) can also be set commonly (e.g., the same value) across multiple subcarrier intervals. Alternatively, the number of symbols configured for DMRS can be set separately (e.g., differently) for each subcarrier interval.

[0059] Figures 3-5 illustrate an example of the allocation of the control resource set (or PDCCH) in the time domain. Figure 3 shows the case where resources are configured contiguously within one time slot. Figure 4 shows the case where resources are configured discontinuously within one time slot. Figure 5 shows the case where resources are configured contiguously in the initial time slot but discontinuously in other time slots.

[0060] Furthermore, although this section illustrates the application of beam looping (e.g., switching between beams #1, #2, and #3) on a time slot basis, the time unit, number of beam loops, beam index, etc., are not limited to the structures shown in Figures 3-5. The same beam can also be applied in different time slots.

[0061] In Figures 3-5, Figure 3A , Figure 4A , Figure 5AThis example illustrates the allocation of control resource sets (maximum 3 symbols) when the subcarrier spacing is 120kHz. Figures 3B-3E , Figures 4B-4E , Figures 5B-5E This is an example of the allocation of a control resource set with a subcarrier spacing of 1920 kHz. Although this represents the case where the control resource set with a subcarrier spacing of 1920 kHz is configured in 3 time slots, the number and location of the configurable time slots for the control resource set are not limited to this.

[0062] Figure 3B This indicates that the same Time Domain Resource Allocation (TDRA) is applied across different time slots, and the TDRA is continuous across multiple time slots (or, at least, the TDRA is continuous across different time slots).

[0063] Figure 3C This refers to situations where the same TDRA is applied across different time slots, and the TDRA is discontinuous across multiple time slots (e.g., gaps are created between control resource sets assigned to different time slots). By setting gaps between control resource sets (or PDCCH resources) across multiple time slots, the required time for beam switching can be ensured. Furthermore, UL intervals can be set within time slots.

[0064] Figure 3D This indicates a situation where different TDRAs are applied across different time slots, and the TDRAs are continuous across multiple time slots. In this case, it is possible to configure a structure where a portion of the code symbols are allocated control resource sets in the first and last time slots of the allocation control resource set. Thus, a UL interval can be set within this time slot.

[0065] Figure 3E This refers to situations where different TDRAs are applied across different time slots, and the TDRAs are discontinuous across multiple time slots (e.g., gaps occur between control resource sets allocated to different time slots). By setting gaps between control resource sets (or PDCCH resources) across multiple time slots, the required time for beam switching can be ensured. Furthermore, since the resource allocation area can be flexibly set for each time slot, DL or UL intervals can be flexibly configured.

[0066] Figures 4B-4E This refers to a structure in which resources configured in at least one of the multiple time slots of a configuration control resource set are discontinuous (non-continuous). While this describes applying the same beam to discontinuous resources within a single time slot, it is not a limitation. For example, different beams may be applied to discontinuous resources within a single time slot.

[0067] Figure 4BThis indicates that the same TDRA is applied across different time slots, and that the TDRA is continuous (or interleaved) at least across different time slots. By setting the control resource set (or setting gaps) discontinuously within a single time slot, the time required for beam switching can be ensured, for example, when applying different beams. Furthermore, UL intervals can be set within a time slot.

[0068] Figure 4C This refers to situations where the same TDRA is applied across different time slots, and the TDRA is discontinuous across multiple time slots (e.g., gaps are created between control resource sets assigned to different time slots). By setting gaps between control resource sets (or PDCCH resources) across multiple time slots, the required time for beam switching can be ensured. Furthermore, UL intervals can be set within time slots.

[0069] Figure 4D This indicates a situation where different TDRAs are applied across different time slots, and the TDRAs are continuous across multiple time slots. In this case, it is possible to configure a structure where a portion of the code symbols are allocated control resource sets in the first and last time slots of the allocation control resource set. Thus, a UL interval can be set within this time slot.

[0070] Figure 4E This refers to situations where different TDRAs are applied across different time slots, and the TDRAs are discontinuous across multiple time slots (e.g., gaps occur between control resource sets allocated to different time slots). By setting gaps between control resource sets (or PDCCH resources) across multiple time slots, the required time for beam switching can be ensured. Furthermore, since the resource allocation area can be flexibly set for each time slot, DL or UL intervals can be flexibly configured.

[0071] Figures 5B-5E This refers to a configuration where resources are configured consecutively in at least one time slot out of a set of multiple time slots for configuration control resources. While this indicates contiguous resources at least in the initial time slots of the configuration control resource set, it is not a limitation. Furthermore, while this indicates applying the same beam to discontinuous resources within a single time slot, it is not a limitation. For example, different beams may be applied to discontinuous resources within a single time slot.

[0072] Figure 5B This indicates that the same TDRA is applied between different time slots (e.g., the second and third time slots), and the TDRA is continuous (or interleaved) at least between the different time slots. By setting the control resource set discontinuously within a time slot (or setting gaps), for example, the time required for beam switching can be ensured when applying different beams. Furthermore, UL intervals can be set within a time slot.

[0073] Figure 5C This refers to situations where the same TDRA is applied across different time slots (e.g., the second and third time slots), and the TDRA is discontinuous across multiple time slots (e.g., gaps arise between control resource sets assigned to different time slots). By setting gaps between control resource sets (or PDCCH resources) across multiple time slots, the required time for beam switching can be ensured. Furthermore, UL intervals can be set within time slots.

[0074] Figure 5D This indicates a situation where different TDRAs are applied across different time slots, and the TDRAs are continuous across multiple time slots. In this case, it can be configured such that a control resource set is allocated to a portion of the symbols in at least a portion of the time slots. Thus, a UL interval can be set in that time slot.

[0075] Figure 5E This refers to situations where different TDRAs are applied across different time slots, and the TDRAs are discontinuous across multiple time slots (e.g., gaps occur between control resource sets allocated to different time slots). By setting gaps between control resource sets (or PDCCH resources) across multiple time slots, the required time for beam switching can be ensured. Furthermore, since the resource allocation area can be flexibly set for each time slot, DL or UL intervals can be flexibly configured.

[0076] Furthermore, when the subcarrier spacing is greater than a certain value (e.g., 120 kHz), the demodulation reference signal (DMRS) and PDCCH (or DCI) can be configured to be separated in the time direction (e.g., time multiplexing) (see reference). Figure 6A On the other hand, when the subcarrier spacing is below a certain value (e.g., 120 kHz), the DMRS and PDCCH (or DCI) can be configured to be separated in the frequency direction (e.g., frequency reuse), similar to Rel. 15 (see Rel. 15). Figure 6B ).

[0077] The number of symbols (e.g., X) of the DMRS that time-multiplexes with the PDCCH (or DCI) can be defined in the specification or notified to the UE from the base station via higher-layer signaling, etc. Alternatively, at least the DMRS configured at the beginning (e.g., also known as front-loaded DMRS) can be set for each time slot or per specific time slot. Figure 6A This indicates that at least one DMRS is set at the beginning of each time slot.

[0078] Furthermore, a single DMRS can be shared across multiple time slots. Additionally, the number of symbols in a configured DMRS can be increased based on the period during which the control resource set is allocated (e.g., the number of symbols). The additional DMRS can be configured either for each time slot or per specific time slot. Furthermore, information related to the additional DMRS (e.g., the number and location of the additional DMRS) can be communicated to the UE from the base station via at least one of higher-layer signaling and DCI.

[0079] Frequency Domain

[0080] The frequency domain resources of the control resource set can also be designed based on a specific unit of control channel element (CCE) or aggregation level (AL). For example, similar to Rel.15, at least one of the CCE and AL can be set.

[0081] For example, a CCE can also consist of a specific number (e.g., 6) of resource blocks (RBs). That is, the granularity of the RBs constituting a CCE can also be 6. Furthermore, the supported ALs can also be 1, 2, 4, 8, and 16, just like in Rel.15. For example, 1 CCE, 2 CCEs, 4 CCEs, 8 CCEs, and 16 CCEs can correspond to 1AL, 2AL, 4AL, 8AL, and 16AL, respectively.

[0082] For example, in each subcarrier interval (e.g., 15kHz, 30kHz, 60kHz, 120kHz, 240kHz, 480kHz, 960kHz, 1920kHz, 3840kHz), the number of RBs constituting the CCE and at least one of the ALs corresponding to the CCE can also be set commonly.

[0083] Alternatively, at least one of the number of RBs constituting the CCE and the AL corresponding to the CCE in a specific subcarrier interval (e.g., above 240 kHz) can be set separately from other subcarrier intervals (e.g., below 120 kHz).

[0084] For example, the number of RBs constituting a CCE in a specific subcarrier interval can be set to be different (e.g., fewer) than the number of RBs constituting a CCE in other subcarrier intervals. For example, the number of RBs constituting one CCE in a specific subcarrier interval can be set to less than six (e.g., two or three). When the subcarrier interval becomes larger, reducing the number of RBs constituting the CCE can reduce the impact on usage and simplify the terminal structure.

[0085] Alternatively, the supported AL in a specific subcarrier spacing can be set to be different from the supported AL in other subcarrier spacings (e.g., high). For example, the supported AL in a specific subcarrier spacing can be set to 6, 10, 12, 18, 24, or 32. When the subcarrier spacing increases, the degradation of communication quality can be suppressed by increasing the supported AL. Of course, the supported AL is not limited to this. AL1 can also be supported in a specific subcarrier spacing.

[0086] In addition, as a mapping type between CCE and REG (cce-REG-Mapping), there are interleaved and non-interleaved types.

[0087] When interleaving is applied, 2, 3, or 6 REGs can be grouped together to form a REG bundle (REGBundle), and interleaving is performed on the REG bundle basis. Interleaving can be performed within a CORESET. Without interleaving, a REG bundle is formed from 6 REGs constituting one CCE, and these 6 REGs are configured consecutively in the frequency and / or time directions. In this case, one or more CCEs constituting one PDCCH candidate can also be configured consecutively in the frequency direction.

[0088] Alternatively, the applicable mapping type between CCE and REG can be set separately (e.g., differently) for each subcarrier interval. For example, the structure could be set as follows: when the subcarrier interval is below a specific value (e.g., 120kHz), both interleaved and non-interleaved mapping types are supported as the mapping type between CCE and REG. The UE can also be notified from the base station about which type to use via higher-layer signaling, etc.

[0089] Furthermore, when the subcarrier spacing is greater than a certain value (e.g., 120 kHz), only one mapping type can be supported as the mapping type between CCE and REG. This type can also be, for example, non-interleaved. Thus, in the case of single-carrier transmission (e.g., in the case of applying DFT-s-OFDM), an increase in PAPR can be avoided.

[0090] Frequency hopping of the control resource set (or PDCCH) can also be supported when the subcarrier spacing is greater than a certain value. For example, at least one of intro-slot frequency hopping (intro-slot FH) and inter-slot frequency hopping (inter-slot FH) can also be supported. The supported frequency hopping types can be predefined in the specification or notified to the UE from the base station via higher-layer signaling, etc. In addition, different types of frequency hopping can be set for each subcarrier spacing.

[0091] For example, when frequency hopping is supported, the base station can notify the UE of the presence or absence of frequency hopping settings or applications (enable / disable) through higher-layer signaling.

[0092] Furthermore, multiple types of frequency hopping (e.g., intra-slot FH and inter-slot FH) do not need to be set simultaneously. When more than two types of frequency hopping are supported, the base station can also notify the UE of the type of frequency hopping to be applied via higher-layer signaling, etc.

[0093] In a time slot within a FH (Free-Handed) time slot, the time slot boundaries can also be determined based on the number of symbols configured in the PDCCH. For example, when the number of symbols used in the PDCCH is N, the time slot boundaries can be determined by applying the ceiling (rounding up) function or the floor (rounding down) function (ceil / floor(N / 2)) to N / 2.

[0094] Furthermore, the frequency domain offset in frequency hopping (e.g., the offset between the first hop and the second hop) can be communicated to the UE from the base station via higher-layer signaling, or it can be defined in the specification based on the bandwidth size.

[0095] <Spatial Domain>

[0096] The spatial domain resource of the control resource set can also be configured with multiple (e.g., more than one) TCI states. For example, the network can also notify the UE of information related to the TCI state (e.g., the number of TCI states) through higher-layer parameters (e.g., tci-StatesPDCCH-ToAddList, etc.).

[0097] When the PDCCH is configured to be transmitted in different time slots (or using multiple time slots to transmit the PDCCH) (e.g., Figures 3-5), the same TCI state can be applied to the PDCCH. In addition, the time slot can also be replaced with a mini time slot, a half time slot, or a specific number of symbols.

[0098] Alternatively, when the PDCCH is configured to be sent in different time slots (or, when multiple time slots are used to send the PDCCH) (e.g., Figures 3-5), different TCI states can be applied to the PDCCH (see Figures 3-5). Figure 7 ). Figure 7 This indicates the application of different TCI states (here, TCI states #1-#3) to the PDCCH transmitted in each time slot (or, mini time slot, half time slot, specific number of symbols).

[0099] If the number of TCI states (or TCI state sequences or TCI state sets) set by higher-level signaling exceeds the transmission timing of the PDCCH, a specific TCI state can be activated (or updated) using MAC CE.

[0100] For example, consider the case where a set of three TCI states (3TCI state set) is set via higher-level signaling (see reference). Figure 7 Each set can include TCI states with the same index or TCI states with different indices. In this case, the base station can also use MAC CE to specify a specific set of TCI states. Figure 7 This indicates the case of the specified TCI state set #1.

[0101] Alternatively, if the base station has determined the optimal beam (or TCI state) for each time slot (or mini time slot, half time slot, or a specific number of symbols), it can also apply the optimal beam to all time slots. In this case, the UE can be assumed to be notified (or activated / set) one TCI state for all PDCCH repetitions.

[0102] When the base station transmits PDCCH using beam looping, the receiving beam (or, also called the receiving panel or logical panel) of the UE that receives each PDCCH can be set to any one of the following options 1-3.

[0103] Option 1: Apply the same receiving beam

[0104] Option 2: Apply different receiving beams

[0105] Option 3: Apply beams determined autonomously by the UE

[0106] In options 1 and 2, information related to the receive beam used by the UE can also be specified using at least one of higher-layer signaling and MAC CE. In option 3, the receive beam is selected (UE-implemented) on the UE side.

[0107] In addition, regarding the UE's receiving beam (or receiving panel), besides being set, activated, or notified of the TCI status, the panel ID can also be set, activated, or notified. Alternatively, regarding the UE's receiving beam (or receiving panel), besides being set, activated, or notified of the panel ID, the TCI status can also be set, activated, or notified.

[0108] For example, when a specific panel ID is set, activated, or notified, the UE may also be required to receive DL transmissions (e.g., at least one of PDCCH, PDSCH, CSI-RS, and PTRS (Phase Tracking Reference Signal)) in the panel corresponding to that panel ID. Alternatively, the panel ID can be replaced with an antenna port group, reference signal group (RS group), reception entity, Rx beam group, or Rx beam. The panel ID may not necessarily correspond to the physical panel ID; it can also be a logical panel ID (e.g., logical panel ID).

[0109] (Second method)

[0110] In the second approach, a modulation scheme applied to a DL channel (e.g., PDCCH) will be described. Furthermore, the following description will explain a modulation scheme applied to a DL channel with a subcarrier spacing greater than a specific value (e.g., 120 kHz), but it can also be applied to subcarrier spacings below the specific value.

[0111] Multiple modulation orders can be supported in PDCCH modulation. For example, PDCCH modulation can support not only QPSK, but also at least one of BPSK, pi / 2QPSK, and pi / 2BPSK.

[0112] The determination (or notification) of the modulation order (or modulation scheme) used for PDCCH transmission can also be controlled by different methods. Furthermore, the method for determining the modulation order can be set separately according to the communication period. For example, the modulation order applied to the PDCCH can be determined using a first method during the first period, and a second method during the second period (see [reference]). Figure 8 ).

[0113] Furthermore, even within the same period (e.g., the second period), the method for determining the modulation order can be set separately based on the type or category of PDCCH (or DCI).

[0114] The first period can be before setting (e.g., providing) higher-layer signaling (e.g., dedicated RRC signaling), and the second period can be after setting that higher-layer signaling. The modulation order used for PDCCH transmission in the first period can also be referred to as the default modulation order, the first modulation order, etc. Of course, the first and second periods are not limited to these. In addition, a third period may exist in addition to the first and second periods.

[0115] <First Period>

[0116] During the first period, the modulation order used for PDCCH transmission can also be predefined in the specification. For example, the modulation order used for PDCCH transmission during the first period can also be QPSK. When the modulation order to be applied is predefined in the specification, the notification of the modulation order information to the UE can be omitted.

[0117] Alternatively, the modulation order transmitted via PDCCH can also be notified to the UE through system information (see [reference]). Figure 8 System information can be either SIBx (e.g., SIB) or MIB. When the modulation order to be applied is notified to the UE from the base station, the information regarding the modulation order to be applied in the first period, which is then communicated to the UE, can be omitted.

[0118] <Second Period>

[0119] During the second period, the modulation order used for PDCCH transmission can also be determined using at least one of the following notification methods 1 to 4.

[0120] [Notification Method 1]

[0121] Information related to the modulation order can also be communicated using higher-layer signaling (e.g., RRC signaling). In this case, the UE can also determine at least one modulation order based on information contained in higher-layer signaling communicated from the network (e.g., base station).

[0122] [Notification Method 2]

[0123] The modulation order used for PDCCH transmission can be determined based on the type or category of the PDCCH (or DCI). For example, information related to the modulation order applied in PDCCH transmission of UE-specific DCI can be transmitted using a specific method, while information related to the modulation order applied in PDCCH transmission of common DCI (or group common DCI) can be transmitted using other methods.

[0124] A specific method may also utilize notifications from higher-layer signaling. The UE may also determine the modulation order of the PDCCH used for UE-specific DCI based on information contained in the higher-layer signaling notified from the base station.

[0125] Other methods may involve notification using higher-layer signaling or system information. The UE may also determine the modulation order of the PDCCH applied to the common DCI based on information contained in at least one of the higher-layer signaling and system information notified from the base station. Furthermore, when information regarding the modulation order corresponding to the common DCI is notified using higher-layer signaling, it can be notified separately from information regarding the modulation order corresponding to the UE-specific DCI (e.g., using different RRC parameters).

[0126] Alternatively, the modulation order applied in the PDCCH transmission of common DCI (or group common DCI) can also be predefined in the specification. In this case, the UE can also determine the modulation order corresponding to the UE-specific DCI based on information from the base station, and determine the modulation order corresponding to the common DCI based on the content defined in the specification.

[0127] In this way, by determining the modulation order applied to the PDCCH based on the type or category of the PDCCH (or DCI), the modulation order can be flexibly set according to the type of the PDCCH.

[0128] [Notification Method 3]

[0129] Information related to the modulation order can also be determined using higher-layer signaling (e.g., RRC signaling) and MAC control information (e.g., MAC CE). For example, higher-layer signaling can be used to set multiple candidates (or sets of modulation orders) for PDCCH transmission, and MAC CE can be used to specify a particular modulation order.

[0130] The UE can also determine a modulation order based on information related to multiple modulation order candidates contained in higher-layer signaling notified from the base station and information contained in the MAC CE. In this case, the modulation order applied to the PDCCH that schedules the MAC CE can also utilize the modulation order known to the UE in advance. For example, it can be the latest modulation order specified by the MAC CE, or it can be a predefined modulation order (e.g., the default modulation order).

[0131] In this way, by using MAC CE to notify information related to the modulation order, the modulation order can be flexibly changed and set.

[0132] [Notification Method 4]

[0133] Information related to the modulation order can also be determined using higher-layer signaling (e.g., RRC signaling) and other side information. For example, higher-layer signaling can be used to set multiple candidate modulation orders (or a set of modulation orders) for PDCCH transmission, and a specific modulation order can be determined based on other information.

[0134] Other information may also include at least one of the following: DCI format, search space type, control resource set index, aggregation level, and RNTI type. For example, multiple modulation order candidates set via higher-level signaling may be associated with different DCI formats (or search space type, control resource set index, aggregation level, and RNTI type).

[0135] The UE can also determine a modulation order based on information related to multiple modulation order candidates contained in the higher-layer signaling notified from the base station and other information applied to PDCCH transmission.

[0136] In this way, by determining the modulation order based on other information, the modulation order can be flexibly changed and set.

[0137] (Third method)

[0138] In the third approach, the allocation method for DL ​​channels (e.g., PDCCH) is described. Alternatively, allocation can be interchanged with mapping or multiplexing. Furthermore, in the following description, multiplexing can also be at least one of multiplexing between different UEs and multiplexing between different antenna ports.

[0139] Furthermore, the following description illustrates the modulation scheme of the DL channel when the subcarrier spacing is greater than a specific value (e.g., 120 kHz), but it can also be applied to subcarrier spacings below the specific value.

[0140] The allocation of DL channels can employ at least one of the following: comb, cyclic shift, time-domain OCC, and frequency-domain OCC. A comb can be referred to as a CDM group.

[0141] At least one of comb, cyclic shift, time-domain OCC, and frequency-domain OCC can be applied only in the DMRS used for demodulation of the DL channel (e.g., the demodulation DMRS of PDCCH). That is, PDCCH (or DCI) may also not apply comb, cyclic shift, time-domain OCC, and frequency-domain OCC.

[0142] Alternatively, at least one of comb, cyclic shift, time-domain OCC, and frequency-domain OCC can also be applied to both the decall DMRS and PDCCH (or DCI) of PDCCH.

[0143] Information relating to at least one of comb, cyclic shift, time-domain OCC, and frequency-domain OCC (e.g., the number applied, etc.) can also be communicated to the UE from the base station via higher-layer signaling. The DMRS structures for different time slots can be identical or configured separately.

[0144] Figure 9A This indicates the application of 2 combs, 2 cyclic shifts, and time-domain OCC. In this case, since the DMRS is configured in two adjacent symbols, in addition to using combs and cyclic shifts (CS), time-direction (time-division) orthogonal codes (TD-OCC) can also be used. For example, up to 8 access points (APs) can be supported using 2 types of combs, 2 types of CS, and TD-OCC ({1,1} and {1,-1}). Alternatively, up to 4 APs can be supported without using TD-OCC ({1,1} and {1,-1}). Furthermore, TDM can be applied without using TD-OCC.

[0145] Figure 9B This indicates the application of frequency-domain OCC and time-domain OCC to adjacent RE units. In this case, DMRS is configured in two adjacent symbols, thus applying orthogonal codes (2-FD-OCC) to two adjacent resource elements (REs) in the frequency direction and TD-OCC ({1,1} and {1,-1}) to two adjacent REs in the time direction, thereby supporting up to 12 APs. Alternatively, up to 6 APs can be supported without using TD-OCC ({1,1} and {1,-1}). Furthermore, TDM can be applied without using TD-OCC.

[0146] Figure 9C This indicates the case where two OCCs (two frequency domain OCCs) are applied in the frequency direction. Figure 9D This represents the case of 12 cyclic shifts and the application of 2 OCCs (2 time-domain OCCs) in the time direction.

[0147] For example, PDCCH multiplexing can also be performed based on combos (or different DCM groups) (e.g., multiplexing of PDCCHs between different UEs). Furthermore, when multiple MIMO layers are supported for the PDCCH, at least one of cyclic shift, time-domain OCC, and frequency-domain OCC can be applied to different layers of the PDCCH (or different antenna ports). This allows for appropriate multiplexing between UEs and between antenna ports.

[0148] Furthermore, when the subcarrier spacing is greater than a certain value (e.g., 120 kHz), DMRS sequence hopping during PDCCH de-calling can also be supported. DMRS sequence hopping can be controlled based on at least one of the symbol level, slot level, mini-slot level (or sub-slot level).

[0149] For example, when applying symbol-level sequence skipping and applying time-domain OCC to multiple symbols of DMRS, the same DMRS sequence can be applied to multiple DMRS symbols within a single time-domain OCC. This maintains the orthogonality of the time-domain OCC.

[0150] <Allocation of control and data channels>

[0151] The allocation of control channels (e.g., PDCCH) and data channels (e.g., PDSCH) can employ at least one of frequency multiplexing (e.g., FDM) and time multiplexing (e.g., TDM).

[0152] Frequency reuse

[0153] When the UE supports frequency reuse between PDCCH and PDSCH, it can also be controlled to allocate PDCCH to the first allocation area (or resource) and PDSCH to the second allocation area. For example, the first allocation area can be the edge area of ​​a cell, CC, or BWP, and the second allocation area can be the innerside area of ​​a cell, CC, or BWP.

[0154] For example, PDSCH can also be assigned with PDCCH in the frequency direction (see reference). Figure 10 Therefore, continuous resources can be used to send PDSCH.

[0155] [Time reuse]

[0156] When the UE supports time multiplexing between PDCCH and PDSCH, the interval between PDCCH and PDSCH can also be controlled based on UE capability. Furthermore, a time gap can be set between PDCCH and PDSCH. By setting a time gap, the increased processing load on the UE can be suppressed in the PDSCH buffer.

[0157] [Frequency multiplexing / Time multiplexing]

[0158] Furthermore, time multiplexing and frequency multiplexing can also be applied between PDCCH and PDSCH. Thus, the network (e.g., the base station) can flexibly control the allocation of PDCCH and PDSCH based on UE capabilities, requested communication conditions, communication environment, etc.

[0159] (Wireless communication system)

[0160] The structure of a wireless communication system according to one embodiment of the present disclosure will now be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods described in the above embodiments of the present disclosure.

[0161] Figure 11 This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment. The wireless communication system 1 may be a system that uses Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) as standardized by the Third Generation Partnership Project (3GPP).

[0162] Furthermore, the wireless communication system 1 can support dual connectivity between multiple radio access technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0163] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0164] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (e.g., dual connectivity between MN and SN, which are both NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0165] The wireless communication system 1 may also have a base station 11 forming a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a-12c) configured within the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration and number of cells and user terminals 20 are not limited to the arrangement shown in the figures. Hereinafter, without distinguishing between base stations 11 and 12, they will be collectively referred to as base station 10.

[0166] User terminal 20 may also connect to at least one of multiple base stations 10. User terminal 20 may also utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0167] Each CC can also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). Macro cell C1 can also be included in FR1, and small cell C2 can also be included in FR2. For example, FR1 can also be a frequency band below 6 GHz (sub-6 GHz), and FR2 can also be a frequency band above 24 GHz. In addition, the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these; for example, FR1 can also correspond to a frequency band higher than FR2.

[0168] In addition, in each CC, the user terminal 20 may also use at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) for communication.

[0169] Multiple base stations 10 can also be connected via wired (e.g., fiber optic cable based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, in the case where NR communication is used as the backhaul between base stations 11 and 12, base station 11, corresponding to the host station, can be referred to as the Integrated Access Backhaul (IAB) donor, and base station 12, corresponding to the relay station, can be referred to as the IAB node.

[0170] Base station 10 may also be connected to core network 30 via other base stations 10 or directly. For example, core network 30 may include at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0171] User terminal 20 can also be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0172] In wireless communication system 1, wireless access methods based on orthogonal frequency division multiplexing (OFDM) can also be used. For example, at least one of the downlink (DL) and uplink (UL) can utilize cyclic prefix orthogonal frequency division multiplexing (CP-OFDM), discrete fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc.

[0173] The wireless access method can also be referred to as a waveform. In addition, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be used in the wireless access methods of UL and DL in wireless communication system 1.

[0174] As a downlink channel, the wireless communication system 1 can also use downlink shared channels (Physical Downlink Shared Channel (PDSCH)), broadcast channels (Physical Broadcast Channel (PBCH)), downlink control channels (Physical Downlink Control Channel (PDCCH)) and so on, which are shared among the user terminals 20.

[0175] In addition, as uplink channels, the wireless communication system 1 may also use uplink shared channels (Physical Uplink Shared Channel (PUSCH)), uplink control channels (Physical Uplink Control Channel (PUCCH)), random access channels (Physical Random Access Channel (PRACH)) and so on, which are shared by each user terminal 20.

[0176] User data, high-level control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and high-level control information can also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) can be transmitted via PBCH.

[0177] Lower-layer control information can also be transmitted via PDCCH. For example, lower-layer control information may include downlink control information (DCI) containing scheduling information from at least one of PDSCH and PUSCH.

[0178] Additionally, the DCI for scheduling PDSCH can also be called DL allocation, DL DCI, etc., and the DCI for scheduling PUSCH can also be called UL authorization, UL DCI, etc. Furthermore, PDSCH can be replaced with DL data, and PUSCH can be replaced with UL data.

[0179] In PDCCH detection, a Control Resource Set (CORESET) and a search space can be utilized. A CORESET corresponds to the resources used to search for DCIs. The search space corresponds to the search area and search method for PDCCH candidates. A CORESET can be associated with one or more search spaces. The UE can also monitor CORESETs associated with a specific search space based on search space settings.

[0180] A search space can also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces can also be referred to as a search space set. In addition, the terms "search space", "search space set", "search space setting", "search space set setting", "CORESET", and "CORESET setting" in this disclosure can be interchanged.

[0181] The PUCCH can also be used to transmit uplink control information (UCI) including at least one of the following: Channel State Information (CSI), delivery confirmation information (e.g., also known as Hybrid Automatic Repeat Request ACK Knowledgement (HARQ-ACK), ACK / NACK, etc.), and Scheduling Request (SR). The PRACH can be used to transmit the random access preamble for establishing a connection with the cell.

[0182] In addition, in this disclosure, downlink, uplink, etc., may be represented without the label "link". Furthermore, the label "Physical" may be omitted at the beginning of various channels.

[0183] In wireless communication system 1, synchronization signals (SS) and downlink reference signals (DL-RS) can also be transmitted. As DL-RS, wireless communication system 1 can also transmit cell-specific reference signals (CRS), channel state information reference signals (CSI-RS), demodulation reference signals (DMRS), positioning reference signals (PRS), phase tracking reference signals (PTRS), etc.

[0184] For example, a synchronization signal can be at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS used by PBCH) can be called an SS / PBCH block, SS Block (SSB), etc. In addition, SS, SSB, etc. can also be called reference signals.

[0185] Furthermore, as an uplink reference signal (UL-RS), measurement reference signals (sounding reference signals (SRS)) and demodulation reference signals (DMRS) can also be transmitted in the wireless communication system 1. Additionally, DMRS can also be referred to as a user terminal-specific reference signal (UE-specific reference signal).

[0186] (Base station)

[0187] Figure 12 This diagram illustrates an example of the structure of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmit / receive unit 120, a transmit / receive antenna 130, and a transmission line interface 140. Furthermore, the control unit 110, the transmit / receive unit 120, the transmit / receive antenna 130, and the transmission line interface 140 may each be provided with one or more of each.

[0188] Furthermore, in this example, the functional blocks mainly represent the characteristic parts of this embodiment. It is also conceivable that the base station 10 may have other functional blocks required for wireless communication. A portion of the processing of each unit described below may also be omitted.

[0189] The control unit 110 performs overall control of the base station 10. The control unit 110 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the art of this disclosure.

[0190] The control unit 110 can also control signal generation and scheduling (e.g., resource allocation, mapping). The control unit 110 can also control transmission, reception, and measurement using the transmit / receive unit 120, transmit / receive antenna 130, and transmission path interface 140. The control unit 110 can also generate data, control information, sequences, etc., to be transmitted as signals and forward them to the transmit / receive unit 120. The control unit 110 can also perform call processing (setting, releasing, etc.) of the communication channel, status management of the base station 10, and management of wireless resources.

[0191] The transmitting / receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting / receiving unit 120 can be composed of transmitters / receivers, RF circuits, baseband circuits, filters, phase shifters, measurement circuits, transmitting / receiving circuits, etc., as described based on common knowledge in the art of this disclosure.

[0192] The transmitting and receiving unit 120 can be configured as a single integrated unit, or it can be composed of a transmitting unit and a receiving unit. The transmitting unit can also be composed of a transmitting processing unit 1211 and an RF unit 122. The receiving unit can also be composed of a receiving processing unit 1212, an RF unit 122, and a measurement unit 123.

[0193] The transmitting and receiving antenna 130 can be constructed from an antenna, such as an array antenna, as described in the art based on common knowledge in the field of this disclosure.

[0194] The transmitting / receiving unit 120 can also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 can also receive the aforementioned uplink channel, uplink reference signal, etc.

[0195] The transmitting and receiving unit 120 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of the transmitting beam and the receiving beam.

[0196] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also process data and control information obtained from the control unit 110, such as data and control information, using the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), and the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), to generate a bit string to be transmitted.

[0197] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (including error correction coding), modulation, mapping, filter processing, Discrete Fourier Transform (DFT) processing (as needed), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be transmitted, and output the baseband signal.

[0198] The transmitting and receiving unit 120 (RF unit 122) can also modulate, filter, amplify, etc., the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 130.

[0199] On the other hand, the transmitting and receiving unit 120 (RF unit 122) can also amplify, filter, and demodulate the signals of the wireless frequency band received by the transmitting and receiving antenna 130 into the baseband signal.

[0200] The transmitting and receiving unit 120 (receiving and processing unit 1212) can also perform receiving and processing on the acquired baseband signal, including analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (including error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0201] The transmitting / receiving unit 120 (measurement unit 123) can also perform measurements related to the received signal. For example, the measurement unit 123 can also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc., based on the received signal. The measurement unit 123 can measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 110.

[0202] The transmission path interface 140 can also send and receive (backhaul signaling) signals with devices included in the core network 30, other base stations 10, etc., to acquire and transmit user data (user plane data), control plane data, etc. for user terminal 20.

[0203] Alternatively, the transmitting and receiving units of the base station 10 in this disclosure may also be composed of at least one of the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140.

[0204] In addition, the transmitting and receiving unit 120 may also transmit a control resource set whose maximum value of at least one of the configured number of symbols and number of time slots is changed based on the subcarrier spacing.

[0205] In addition, the transmitting and receiving unit 120 may also transmit at least one of information relating to the first modulation order applied in the first period and information relating to the second modulation order applied in the second period.

[0206] Furthermore, the transmitting and receiving unit 120 can also transmit a downlink channel decall reference signal that has been applied with at least one of comb, cyclic shift, and OCC in a frequency band higher than a specific frequency.

[0207] Control unit 110 controls the transmission of downlink channels (e.g., PDCCH, PDSCH, etc.) in frequency bands above a specific frequency.

[0208] (User terminal)

[0209] Figure 13 This diagram illustrates an example of the structure of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Furthermore, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may each be provided in more than one form.

[0210] Furthermore, in this example, the functional blocks that mainly represent the characteristic parts of this embodiment are also conceivable; however, it is also possible that the user terminal 20 may have other functional blocks required for wireless communication. A portion of the processing of each unit described below may also be omitted.

[0211] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the art of this disclosure.

[0212] The control unit 210 can also control signal generation, mapping, etc. The control unit 210 can also control transmission, reception, measurement, etc., using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, sequences, etc., to be transmitted as signals and forward them to the transmission / reception unit 220.

[0213] The transmitting / receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting / receiving unit 220 may be composed of transmitters / receivers, RF circuits, baseband circuits, filters, phase shifters, measurement circuits, transmitting / receiving circuits, etc., as described based on common knowledge in the art of this disclosure.

[0214] The transmitting and receiving unit 220 can be configured as a single integrated transmitting and receiving unit, or it can be composed of a transmitting unit and a receiving unit. The transmitting unit can also be composed of a transmitting processing unit 2211 and an RF unit 222. The receiving unit can also be composed of a receiving processing unit 2212, an RF unit 222, and a measurement unit 223.

[0215] The transmitting and receiving antenna 230 can be constructed from an antenna, such as an array antenna, as described in the art based on common knowledge in the field of this disclosure.

[0216] The transmitting / receiving unit 220 can also receive the downlink channel, synchronization signal, downlink reference signal, etc., mentioned above. The transmitting / receiving unit 220 can also transmit the uplink channel, uplink reference signal, etc., mentioned above.

[0217] The transmit / receive unit 220 may use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of the transmit beam and the receive beam.

[0218] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control) on data and control information obtained from the control unit 210, and generate a bit string to be transmitted.

[0219] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (including error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be transmitted, and output the baseband signal.

[0220] Furthermore, whether or not to apply DFT processing can also be based on the transform precoding setting. For a certain channel (e.g., PUSCH), if transform precoding is enabled, the transmit / receive unit 220 (transmit processing unit 2211) can perform DFT processing as the aforementioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform; otherwise, it can also perform DFT processing without performing DFT processing as the aforementioned transmission processing.

[0221] The transmitting and receiving unit 220 (RF unit 222) can also modulate, filter, amplify, etc., the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 230.

[0222] On the other hand, the transmitting and receiving unit 220 (RF unit 222) can also amplify, filter, and demodulate the signals of the wireless frequency band received by the transmitting and receiving antenna 230 into the baseband signal.

[0223] The transmitting and receiving unit 220 (receiving and processing unit 2212) can also perform receiving and processing on the acquired baseband signal, such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (including error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data.

[0224] The transmitting / receiving unit 220 (measurement unit 223) can also perform measurements related to the received signal. For example, the measurement unit 223 can also perform RRM measurements, CSI measurements, etc., based on the received signal. The measurement unit 223 can also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 210.

[0225] Alternatively, the transmitting and receiving units of the user terminal 20 in this disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230.

[0226] In addition, the transmitting and receiving unit 220 can also receive a control resource set whose maximum value of at least one of the configured number of symbols and number of time slots is changed based on at least one of the subcarrier spacing and frequency band.

[0227] Furthermore, the transmitting / receiving unit 220 may also receive at least one of information related to the first modulation order applied in the first period and information related to the second modulation order applied in the second period. Furthermore, the transmitting / receiving unit 220 receives the downlink channel based on at least one of the received information related to the first modulation order and the second modulation order.

[0228] Furthermore, the transmitting and receiving unit 220 can also receive a decall reference signal for a downlink channel that has been applied with at least one of comb-shaped subcarrier configuration, cyclic shift, and orthogonal cover code (OCC) in a frequency band above a specific frequency.

[0229] The control unit 210 controls the reception of the control resource set. When the subcarrier spacing is below a specific value, the maximum number of symbols configured for the control resource set can be the same; when the subcarrier spacing is greater than the specific value, the maximum number of symbols configured for the control resource set can be set to multiple values ​​depending on the subcarrier spacing. When the control resource set is configured with multiple symbols, the configuration of the control resource set in each time slot can be set separately. The number of resource blocks constituting the control channel element when the subcarrier spacing is below the specific value and the number of resource blocks constituting the control channel element when the subcarrier spacing is greater than the specific value can also be different. When the control resource set is configured with multiple symbols, a transmission configuration indicator (TCI) applied to the transmission of the control resource set in each time slot can be set separately.

[0230] The control unit 210 can also determine the first modulation order applied in the first period and the second modulation order applied in the second period based on different information. Furthermore, the control unit 210 can also determine the first modulation order based on information defined in the specification or information notified via system information. Additionally, the control unit 210 can also determine the second modulation order based on information notified via higher-layer signaling. Furthermore, the control unit 210 can determine multiple modulation orders as the second modulation order based on the applied channel category. Moreover, the control unit 210 can also determine the second modulation order based on higher-layer signaling notifying multiple modulation order candidates and MAC control information specifying a particular modulation order candidate, or other parameters.

[0231] Control unit 210 can also control downlink channel reception based on a demodulation reference signal and information notified via higher-layer signaling. At least one of comb, cyclic shift, and OCC can also be applied to the downlink channel. At least one of comb, cyclic shift, and OCC can also be applied to the demodulation reference signal. The sequence of the demodulation reference signal can also be skipped at each specific time unit. The downlink channel can also be a downlink control channel configured in a first region of a portion of the bandwidth, with a downlink shared channel scheduled via the downlink control channel configured closer to the center of the portion of the bandwidth than the first region.

[0232] (Hardware structure)

[0233] Furthermore, the block diagrams used in the above description of the embodiments represent functional units. These functional blocks (constituent units) are implemented through any combination of at least one of hardware and software. Moreover, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented using a single device that is physically or logically combined, or it can be implemented by directly or indirectly (e.g., using wired, wireless, etc.) connecting two or more physically or logically separate devices, using these multiple devices. Functional blocks can be implemented by combining software within the aforementioned single device or multiple devices.

[0234] Here, functions include judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, belief, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning, but are not limited to these. For example, the functional block (constituting unit) that enables sending can be called a transmitting unit, a transmitter, etc. As mentioned above, the implementation method is not particularly limited in each case.

[0235] For example, the base station, user terminal, etc. in one embodiment of this disclosure can also function as a computer for processing the wireless communication method of this disclosure. Figure 14 This diagram illustrates an example of the hardware structure of a base station and a user terminal according to one embodiment. The base station 10 and the user terminal 20 described above can be physically configured as a computer device including a processor 1001, a memory 1002, a storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0236] Furthermore, in this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware structure of base station 10 and user terminal 20 can be configured to include one or more of the apparatuses shown in the figures, or it can be configured without including some of the apparatuses.

[0237] For example, only one processor 1001 is illustrated, but there can be multiple processors. Furthermore, processing can be executed by one processor, or it can be executed simultaneously, sequentially, or by two or more processors through other methods. Additionally, processor 1001 can be implemented using more than one chip.

[0238] For example, by reading specific software (programs) onto hardware such as processor 1001 and memory 1002, processor 1001 performs calculations to control communication via communication device 1004, or to control at least one of reading and writing data in memory 1002 and storage device 1003, thereby realizing the various functions of base station 10 and user terminal 20.

[0239] The processor 1001 controls the computer as a whole by enabling the operating system to operate. The processor 1001 may also be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic devices, registers, etc. For example, at least some of the control unit 110 (210), the transmit / receive unit 120 (220), etc. described above may also be implemented by the processor 1001.

[0240] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and performs various processes accordingly. As a program, a program is used that causes the computer to perform at least a portion of the operations described in the above embodiments. For example, the control unit 110 (210) can be implemented by a control program stored in the memory 1002 and operated in the processor 1001; similarly, other functional blocks can also be implemented.

[0241] The memory 1002 is a computer-readable recording medium, and may be composed of at least one of read-only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), random access memory (RAM), or other suitable storage media. The memory 1002 may be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 is capable of storing programs (program code), software modules, etc., that are executable for implementing the wireless communication method of one embodiment of the present disclosure.

[0242] Storage 1003 is a computer-readable recording medium, and may also consist of at least one of the following: flexible disc, floppy disk, optical disk (e.g., compact disc (CD-ROM), digital universal disk, Blu-ray disk), removable disk, hard disk, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage media. Storage 1003 may be referred to as an auxiliary storage device.

[0243] The communication device 1004 is hardware (transmitting and receiving device) used for communication between computers via at least one of a wired network and a wireless network. For example, it is also called a network device, network controller, network interface card (NIC), communication module, etc. In order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD), the communication device 1004 may also be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the aforementioned transmitting and receiving unit 120 (220) and transmitting and receiving antenna 130 (230) can be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) can be physically or logically separated by a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0244] Input device 1005 is an input device that receives input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, light-emitting diode (LED) lamp, etc.). Alternatively, input device 1005 and output device 1006 can also be an integrated structure (e.g., a touch panel).

[0245] Furthermore, devices such as processor 1001 and memory 1002 can be connected via bus 1007 for communicating information. Bus 1007 can be configured as a single bus or as different buses between each device.

[0246] Furthermore, the base station 10 and the user terminal 20 may include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field-programmable gate array (FPGA), which can be used to implement some or all of the functional blocks. For example, the processor 1001 can be implemented using at least one of these hardware components.

[0247] (Modified example)

[0248] Furthermore, the terms described in this disclosure and those necessary for understanding this disclosure can be replaced with terms that have the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) can be used interchangeably. Additionally, a signal can also be a message. A reference signal can be abbreviated as RS, or, depending on the application standard, referred to as pilot, pilot signal, etc. Furthermore, a component carrier (CC) can also be referred to as cell, frequency carrier, carrier frequency, etc.

[0249] A radio frame can consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a radio frame can be called a subframe. Furthermore, a subframe can consist of one or more time slots in the time domain. A subframe can be a fixed time length (e.g., 1 ms) independent of the parameter set (numerology).

[0250] Here, the parameter set can also be communication parameters applied to at least one of the transmission and reception of a signal or channel. The parameter set can represent at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, and specific windowing processing performed by the transmitter and receiver in the time domain.

[0251] A time slot can also 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. In addition, a time slot can also be a time unit based on a set of parameters.

[0252] A time slot can also comprise multiple mini-time slots. Each mini-time slot can also consist of one or more symbols in the time domain. Furthermore, a mini-time slot can also be called a sub-time slot. A mini-time slot can also consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-time slot can be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using mini-time slots can be called PDSCH (PUSCH) mapping type B.

[0253] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also use other corresponding names. Furthermore, the time units such as frames, subframes, time slots, mini-time slots, and symbols used in this disclosure can be interchanged.

[0254] For example, a TTI can refer to a single subframe, multiple consecutive subframes, a time slot, or a mini-time slot. That is, at least one of the subframe and TTI can be a subframe in existing LTE (1ms), a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Furthermore, the unit representing TTI can also be a time slot, mini-time slot, etc., instead of a subframe.

[0255] Here, TTI refers, for example, to the smallest unit of time for scheduling in wireless communication. For instance, in an LTE system, the base station schedules the allocation of radio resources (bandwidth, transmit power, etc., available to each user terminal) in TTI units for each user terminal. However, the definition of TTI is not limited to this.

[0256] A Time Interval (TTI) can be a unit of time for transmitting channel-coded data packets (transmission blocks), code blocks, codewords, etc., or it can be a unit of time for processing such as scheduling and link adaptation. Furthermore, when providing a TTI, the actual time interval (e.g., the number of symbols) used to map transmission blocks, code blocks, codewords, etc., can be shorter than the TTI.

[0257] Additionally, while a time slot or a mini-time slot may be referred to as a TTI, more than one TTI (i.e., more than one time slot or more than one mini-time slot) can also serve as the minimum time unit for scheduling. Furthermore, the number of time slots (mini-time slots) constituting the minimum time unit of the schedule can also be controlled.

[0258] A TTI with a duration of 1ms can also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), standard TTI, long TTI, normal subframe, standard subframe, long subframe, time slot, etc. A TTI shorter than a normal TTI can also be referred to as a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, mini time slot, sub-time slot, time slot, etc.

[0259] In addition, long TTIs (e.g., normal TTIs, subframes, etc.) can be replaced by TTIs with a duration of more than 1 ms, and short TTIs (e.g., shortened TTIs, etc.) can be replaced by TTIs with a duration of less than that of long TTIs but more than 1 ms.

[0260] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it can also include one or more consecutive subcarriers. The number of subcarriers in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers in an RB can also be determined based on the parameter set.

[0261] Furthermore, an RB can include one or more symbols in the time domain, or it can be the length of a time slot, a mini-time slot, a subframe, or a TTI. A TTI, a subframe, etc., can each be composed of one or more resource blocks.

[0262] In addition, one or more RBs can also be referred to as Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0263] Furthermore, a resource block can consist of one or more resource elements (REs). For example, an RE can be a radio resource area consisting of a subcarrier and a symbol.

[0264] The Bandwidth Part (BWP) (which may be referred to as partial bandwidth, etc.) can also represent a subset of consecutive common resource blocks (RBs) for a certain parameter set in a carrier. Here, common RBs can also be determined by the index of RBs based on a common reference point of the carrier. PRBs can also be defined by a BWP and labeled within that BWP.

[0265] A BWP can also include a UL BWP (the BWP used by UL) and a DL BWP (the BWP used by DL). For a UE, one or more BWPs can also be set within a single carrier.

[0266] At least one of the configured BWPs can be active, and the UE may not intend to transmit or receive specific signals / channels outside of the active BWP. Additionally, the terms "cell," "carrier," etc., in this disclosure can be replaced with "BWP."

[0267] Furthermore, the structures of radio frames, subframes, time slots, mini-time slots, and symbols described above are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained in a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, and the number of symbols in a TTI, symbol length, and cyclic prefix (CP) length can be varied.

[0268] Furthermore, the information, parameters, etc., described in this disclosure can be represented using absolute values, relative values ​​with respect to a specific value, or other corresponding information. For example, wireless resources can also be indicated by a specific index.

[0269] The names used for parameters, etc., in this disclosure are not limiting names in any respect. Furthermore, the formulas, etc., using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any appropriate names, the various names assigned to these various channels and information elements are not limiting names in any respect.

[0270] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, etc., mentioned throughout the foregoing description can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0271] Furthermore, information, signals, etc., can also be output in at least one of the following directions: from higher level (upper layer) to lower level (lower layer) and from lower layer to higher level. Information, signals, etc., can be input and output through multiple network nodes.

[0272] Input and output information and signals can be stored in a specific location (e.g., memory) or managed using a management table. Input and output information and signals can be overwritten, updated, or appended. Output information and signals can also be deleted. Input information and signals can also be sent to other devices.

[0273] The notification of information is not limited to the methods / implementations described in this disclosure, and other methods may also be used. For example, the notification of information in this disclosure may also be implemented through physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC)) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC)) signaling, other signals, or combinations thereof.

[0274] Additionally, physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. Furthermore, RRC signaling can be referred to as RRC messages, for example, as RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. Additionally, MAC signaling can also be notified using, for example, MAC Control Elements (CEs).

[0275] Furthermore, notification of specific information (e.g., a notification that “is X”) is not limited to explicit notification; it can also be implicit (e.g., by not notifying the specific information or by notifying the specific information or by notifying the specific information through other information).

[0276] The determination can be made based on the value represented by 1 bit (whether it is 0 or 1), either by the boolean value representing true or false, or by comparing the values ​​(e.g., comparing with a specific value).

[0277] Whether it is called software, firmware, middleware, microcode, hardware description language, or any other name, software should be broadly interpreted as meaning command, command set, code, code segment, program code, program, subroutine, software module, application, software application, software package, routine, subroutine, object, executable file, execution thread, procedure, function, etc.

[0278] In addition, software, commands, and information can also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL) etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included in the definition of transmission medium.

[0279] The terms “system” and “network” as used in this disclosure may be used interchangeably. “Network” may mean devices included in a network (e.g., base stations).

[0280] In this disclosure, the terms “precoding”, “precoder”, “weight (precoding weight)”, “quasi-co-location (QCL)”, “transmission configuration indication state (TCI state)”, “spatial relation”, “spatial domain filter”, “transmit power”, “phase rotation”, “antenna port”, “antenna port group”, “layer”, “number of layers”, “rank”, “resource”, “resource set”, “resource group”, “beam”, “beamwidth”, “beam angle”, “antenna”, “antenna element”, and “panel” can be used interchangeably.

[0281] In this disclosure, the terms "Base Station (BS)", "Wireless Base Station", "Fixed Station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "Access Point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "Panel", "Cell", "Sector", "Cell Group", "Carrier", and "Component Carrier" can be used interchangeably. Base stations are sometimes also referred to as macrocells, small cells, femtocells, picocells, etc.

[0282] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, its coverage area can be divided into several smaller areas, each of which can provide communication services via a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base station and base station subsystem providing communication services within that coverage area.

[0283] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" may be used interchangeably.

[0284] Mobile stations are sometimes also referred to as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals, handsets, user agents, mobile clients, clients, or several other appropriate terms.

[0285] At least one of the base station and the mobile station can also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Furthermore, at least one of the base station and the mobile station can also be a device mounted on a mobile body, or the mobile body itself. This mobile body can be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanized or unmanned). Additionally, at least one of the base station and the mobile station also includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station can also be an Internet of Things (IoT) device such as a sensor.

[0286] Furthermore, the base station in this disclosure can also be replaced by a user terminal. For example, the various methods / implementations of this disclosure can be applied to a structure where communication between the base station and the user terminal is replaced by communication between multiple user terminals (e.g., which can be referred to as device-to-device (D2D) or vehicle-to-everything (V2X)). In this case, the user terminal 20 can also have the functions of the base station 10 described above. In addition, terms such as "uplink" and "downlink" can be replaced with terms corresponding to inter-terminal communication (e.g., "side"). For example, uplink channel, downlink channel, etc., can also be replaced with side channel.

[0287] Similarly, the user terminal in this disclosure can also be replaced by a base station. In this case, the base station 10 can also have the functions of the user terminal 20 described above.

[0288] In this disclosure, operations purported to be performed by a base station are sometimes performed by its upper node, depending on the circumstances. It should be understood that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed through the base station, one or more network nodes other than the base station (e.g., consider a Mobility Management Entity (MME) such as a Mobility Management Entity (MME), a Serving Gateway (S-GW) such as, but not limited to, these), or combinations thereof.

[0289] The various methods / implementations described in this disclosure can be used individually, in combination, or switched during execution. Furthermore, the processing procedures, timing sequences, flowcharts, etc., of the various methods / implementations described in this disclosure can be rearranged as long as they do not contradict each other. For example, regarding the methods described in this disclosure, the elements of various steps are presented in the illustrative order, but are not limited to a specific order.

[0290] The various methods / implementations described in this disclosure can also be applied to Long Term Evolution (LTE), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Futuregeneration radio access (FX), Global System for Mobile Communications (GSM), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (registered trademark), systems utilizing other appropriate wireless communication methods, and next-generation systems extended from them, etc. Furthermore, multiple systems can be combined (e.g., a combination of LTE or LTE-A and 5G, etc.) for application.

[0291] As used in this disclosure, the word "based on" does not mean "based on only" unless otherwise specified. In other words, the word "based on" means both "based on only" and "based on at least".

[0292] Any reference to an element using the terms "first," "second," etc., as used in this disclosure does not comprehensively limit the quantity or order of these elements. These terms may also be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, references to the first and second elements do not imply that only two elements are permissible, or that the first element must in some form take precedence over the second element.

[0293] As used in this disclosure, the term "determining" sometimes encompasses a variety of operations. For example, "determining" can be viewed as making a "determination" regarding judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), or ascertaining.

[0294] In addition, "judgment (decision)" can also be regarded as the situation of making "judgment (decision)" on receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0295] Furthermore, "judgment (decision)" can also be viewed as situations where "judgment (decision)" is made regarding resolving, selecting, choosing, establishing, comparing, etc. That is, "judgment (decision)" can also include situations where certain operations are regarded as "judgments (decisions)".

[0296] In addition, "judgment (decision)" can also be replaced with "assuming", "expecting", "considering", etc.

[0297] As used in this disclosure, the terms "connected," "coupled," or all variations thereof, mean a direct or indirect connection or combination between two or more elements, and can include cases where there is one or more intermediate elements between the two elements that are "connected" or "coupled." The connection or combination between elements can be physical, logical, or a combination thereof. For example, "connected" can also be replaced with "access."

[0298] In this disclosure, when two elements are connected, they can be considered to be "connected" or "combined" with each other by using one or more wires, cables, printed electrical connections, etc., and as several non-limiting and non-inclusive examples, they can be "connected" or "combined" with each other by using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region.

[0299] In this disclosure, the term "A and B are different" can mean either "A and B are not the same as each other" or "A and B are each different from C". Terms such as "separate" and "combined" can also be interpreted in the same way as "different".

[0300] In the use of “including,” “comprising,” and variations thereof in this disclosure, these terms, like the term “comprising,” refer to inclusion. Furthermore, the term “or” as used in this disclosure does not refer to XOR.

[0301] In this disclosure, for example, in cases where articles are added through translation, such as in English a, an, and the, this disclosure may include cases where the names following these articles are in the plural form.

[0302] The invention described above has been explained in detail. However, it will be apparent to those skilled in the art that the invention is not limited to the embodiments described herein. The invention can be implemented as modifications and variations without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description in this disclosure is for illustrative purposes only and is not intended to limit the invention in any way.

Claims

1. A terminal, characterized in that, have: The receiving unit receives a decall reference signal for the downlink channel in a frequency band above a specific frequency, which is applied with at least one of comb-shaped subcarrier configuration, cyclic shift, and orthogonal cover code (OCC). as well as The control unit controls the reception of the downlink channel based on the demodulation reference signal.

2. The terminal according to claim 1, characterized in that, At least one of the comb, cyclic shift, and OCC is applied to the downlink channel.

3. The terminal according to claim 1 or 2, characterized in that, At least one of the comb, the cyclic shift, and the OCC is applied to the demodulation reference signal.

4. The terminal according to claim 1, characterized in that, The sequence of the demodulation reference signal is skipped at each specific time unit.

5. The terminal according to claim 1, characterized in that, The downlink channel is a downlink control channel, which is configured in a first region of a portion of the bandwidth. The downlink shared channel scheduled through the downlink control channel is configured closer to the center of the portion of the bandwidth than the first region.

6. A wireless communication method, characterized in that, include: The steps of receiving a decryption reference signal for a downlink channel in a frequency band above a specific frequency, wherein at least one of comb-shaped subcarrier configuration, cyclic shift, and orthogonal cover code (OCC) is applied; and The step of controlling the reception of the downlink channel based on the demodulation reference signal.

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