Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure comprises: a reception unit that receives sequence-based first downlink control information (DCI) that does not use a demodulation reference signal (DMRS); and a control unit that controls reception of second DCI using a DMRS on the basis of the first DCI. According to the one aspect of the present disclosure, resource efficiency can be improved.

Description

Terminal, wireless communication method and base station

[0001] The present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system.

[0002] Long Term Evolution (LTE) has been specified for the Universal Mobile Telecommunications System (UMTS) network with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) has been specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later, etc.) are also being considered.

[0004] 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

[0005] In future wireless communication systems (e.g., NR), for example, from the viewpoint of improving resource efficiency, it is being considered to use a sequence-based transmission method that does not use a demodulation reference signal (DMRS) in specific channels (e.g., physical downlink control channel (PDCCH) / physical downlink shared channel (PDSCH) / physical uplink shared channel (PUSCH)).

[0006] However, specific methods for achieving this have not been fully explored. If this exploration is insufficient, there is a risk that improvements in resource efficiency will be hindered and increases in communication throughput will be limited.

[0007] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can improve resource efficiency.

[0008] A terminal according to one aspect of the present disclosure has a receiving unit that receives sequence-based first downlink control information (DCI) that does not use a demodulation reference signal (DMRS), and a control unit that controls reception of a second DCI that uses DMRS based on the first DCI.

[0009] According to one aspect of the present disclosure, resource efficiency can be improved.

[0010] FIG. 1 is a diagram illustrating an example of DCI (DMRS-based DCI) in existing specifications. FIG. 2 is a diagram illustrating an example of sequence-based DCI. FIG. 3 is a diagram illustrating another example of sequence-based DCI. FIG. 4 is a diagram illustrating another example of sequence-based DCI. FIG. 5 is a diagram illustrating an example of sequence-based DCI resources and DMRS-based DCI resources. FIG. 6 is a diagram illustrating an example of multiple PDCCH candidates / DCI candidates monitored by a UE. FIG. 7 is a diagram illustrating an example of a case in which different information is transmitted to multiple PDCCH candidates / DCI candidates on a sequence basis. FIGS. 8A and 8B are diagrams illustrating an example of narrowing down PDCCH candidates / DCI candidates using sequence-based DCI. FIGS. 9A, 10B, 10C, and 10D are diagrams illustrating an example of a process for generating a transmit signal for a sequence-based PDCCH. FIG. 11 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 12 is a diagram illustrating an example of a configuration of a base station according to an embodiment. FIG. 13 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment. Fig. 14 is a diagram illustrating an example of a hardware configuration of a base station and a user terminal according to an embodiment. Fig. 15 is a diagram illustrating an example of a vehicle according to an embodiment.

[0011] (Sequence-based PUCCH) In existing wireless communication systems (for example, up to Rel. 15-17), the following transmission methods for the physical uplink control channel (PUCCH) are specified: a DMRS-based PUCCH (DMRS-based transmission or DMRS-based PUCCH) that notifies UCI by transmitting an UL signal in which demodulation reference signals (DMRS) and uplink control information (UCI) are time division multiplexed (TDM) / frequency division multiplexed (FDM), and a sequence-based PUCCH (sequence-based transmission or sequence-based PUCCH) that notifies UCI by transmitting an UL signal that uses code resources associated with the value of UCI without using DMRS.

[0012] For example, the former is PUCCH format 1 / 2 / 3 / 4, and the latter is PUCCH format 0.

[0013] The sequence-based PUCCH transmits an UL signal using a code resource associated with a UCI value. The code resource is a resource used for code division multiplexing (CDM) and may be at least one of a base sequence, a cyclic shift (CS), and an orthogonal cover code (OCC). CS in the present disclosure may be interpreted as other code resources such as phase rotation and OCC.

[0014] The reference sequence may be a CAZAC (Constant Amplitude Zero Auto-Correlation) sequence (for example, a Zadoff-Chu sequence) or a sequence similar to a CAZAC sequence (a CG-CAZAC (computer generated CAZAC) sequence).

[0015] Information regarding code resources (code resource candidate sets, e.g., CS candidate sets) may be notified from the base station to a terminal (user terminal, User Equipment (UE)) by higher layer signaling, physical layer signaling (e.g., Downlink Control Information (DCI)), or a combination thereof.

[0016] The sequence-based PUCCH has a lower ratio of DMRS resources to PUCCH resources than the DMRS-based PUCCH, and therefore can improve resource efficiency in PUCCH transmission.

[0017] (Minimum Quality Guaranteed in Future Wireless Communication Systems) In existing wireless communication systems (for example, up to Rel. 15-17), mobile communications using public networks generally employ so-called best-effort communications.

[0018] A characteristic of such communications is that telecommunications carriers cannot control sudden increases in traffic volume. For example, in crowded environments such as concerts and stadiums, if traffic suddenly increases, minimum communication standards cannot be guaranteed (for example, you cannot make phone calls or browse the web).

[0019] In existing wireless communication systems (for example, up to Rel. 15-17), mission-critical use cases (for example, Ultra-Reliable and Low Latency Communications (URLLC)) have been considered.

[0020] However, when providing mission-critical communication services over a public network, if the peripheral traffic increases as described above, or if the traffic within the mission-critical communication service increases, it may become impossible to achieve the desired communication quality (e.g., throughput / delay / number of simultaneous connections, etc.).

[0021] Therefore, future wireless communication systems will require mechanisms that can guarantee a minimum level of communication quality, whether for general users or mission-critical use cases.

[0022] However, it is difficult to guarantee a minimum quality with limited resources.

[0023] For example, if the number of users is unknown at any given time, it is difficult to guarantee a minimum quality of service for all users using limited resources.

[0024] Furthermore, since the minimum quality that can be guaranteed varies depending on the performance / type of device / UE, it is difficult to guarantee a minimum quality that can achieve the KPIs (Key Performance Indicators) of services desired by all users.

[0025] Furthermore, since wireless communication quality can change from moment to moment due to various factors, it is difficult to always guarantee a specific performance KPI (for example, throughput / reliability).

[0026] Furthermore, due to limitations on the number of base stations / transmission / reception points that can be deployed, or factors such as the surrounding communication environment, it is difficult to guarantee a specific quality in any location.

[0027] Here, as a method for guaranteeing minimum quality to many UEs, an efficient communication method for low data rate / low payload is being studied.

[0028] More specifically, techniques / methods for low data rate / low payload communication even when the resources that can be allocated to one UE are limited, and techniques / methods for improving the frequency utilization efficiency of resources (e.g., spatial multiplexing of channels / signals, sequence-based transmission), etc. are being considered.

[0029] However, existing wireless communication systems do not always realize low data rate / low payload communications.

[0030] Specifically, since a sequence-based transmission scheme for a specific channel (e.g., physical downlink control channel (PDCCH) / physical downlink shared channel (PDSCH)) has not been fully studied, if the number of symbols in the specific channel is small, the ratio of DMRS resources to the resources of the specific channel becomes high. In this case, there is a risk of a decrease in resource efficiency.

[0031] Therefore, the present inventors have come up with a method for providing sufficient communication even when the resources that can be allocated to one UE are limited, by defining a sequence-based transmission scheme for a specific channel.

[0032] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0033] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0034] In the present disclosure, terms such as notify, activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0035] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, fields, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0036] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, other messages (e.g., messages from the core network such as positioning protocol (e.g., NR Positioning Protocol A (NRPPa) / LTE Positioning Protocol (LPP)) messages), or a combination thereof.

[0037] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. Broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0038] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0039] In the present disclosure, sequence-based, sequence-based transmission, sequence-based DL transmission, sequence-based DL data, sequence-based DCI, sequence-based PDCCH, PDCCH linked to sequence-based, etc. may be interpreted as interchangeable.

[0040] In the present disclosure, DCI in existing specifications, DMRS-based DCI, existing DCI, DMRS-based, PDCCH in existing specifications, DCI modulated using a specific modulation method, PDCCH linked to DCI modulated using a specific modulation method, PDCCH including DMRS, DMRS-based PDCCH, etc. may be read as interchangeable.

[0041] (Wireless Communication Method) <Conditions for Application of Sequence-Based DL Data> DL data (DL information bits) to which sequence-based transmission is applied, and the characteristics / conditions for application of the sequence-based transmission will be described.

[0042] [DL Information Bits] The sequence-based DL information bits may be DCI or may be part of DCI.

[0043] [Channel Type] The channel for sequence-based DL data may be a PDCCH, a PDSCH, a PBCH, or any other DL channel.

[0044] [Type of Receiving Terminal] The DL information bit may be receivable only by UEs with specific UE capability information or UEs subject to minimum quality guarantee. The specific UE capability information may indicate support for sequence-based DL data or support for minimum quality guarantee operation.

[0045] [Applicable DCI] A UE may receive information on a sequence basis for a specific DCI format, or may receive information on a sequence basis for a DCI format having a cyclic redundancy check (CRC) scrambled by a specific RNTI. In other words, a sequence-based transmission may be applied to a specific DCI format / a DCI format having a CRC scrambled by a specific RNTI. The specific DCI format and the specific RNTI may be determined based on parameters configured for the UE or may be predefined.

[0046] [UE State] Sequence-based DL data may be supported only in a specific UE state or in all UE states, such as one or more of RRC IDLE, RRC INACTIVE, other UE states that are not RRC CONNECTED, and RRC CONNECTED.

[0047] [Type of DL data] The sequence-based DL data may be at least one of an instruction to turn on / off transmission / reception of a specific signal, an instruction to transmit / measurement timing, an instruction to use resources, information related to UE capabilities / status, and delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), or other information. For example, at least a portion of the information notified in some DCI fields of any DCI format in existing specifications may be received / notified on a sequence basis (sequence selection).

[0048] [Waveform] The waveform of the sequence-based DL data may be at least one of Orthogonal Frequency Division Multiplex (OFDM), Discrete Fourier Transform (DFT)-spread(s)-Orthogonal Frequency Division Multiplex (OFDM), and pre-chirp, or may be any other waveform.

[0049] [Others] Sequence-based DL data may be applicable only when the DCI payload (information bits) or coding rate is equal to or less than / equal to a predetermined value.

[0050] Information regarding the characteristics / application conditions of the sequence-based transmission described above (e.g., which characteristics are present, which application conditions are used, the specific DCI format / specific RNTI, the specific UE state, the predetermined value, etc.) may be notified to the UE using RRC / MAC CE.

[0051] <Configuration of Sequence-Based DL Data> Sequence-based DL data may be received / notified by a UE according to at least one of the following (1) to (3): (1) At least a portion of the information notified in some DCI fields of any DCI format in the existing specifications is received / notified using sequence-based transmission; (2) At least a portion of the resource information (e.g., aggregation level / DCI format / control channel element (CCE) index, etc.) in any DCI format / search space set (SS) / CORESET / PDCCH in any DCI format in the existing specifications is received / notified using sequence-based transmission; (3) At least a portion of the information notified in some DCI fields of any DCI format in the existing specifications is received / notified using only sequence-based transmission.

[0052] The above (1) and (2) may be applied simultaneously. In this case, at least a portion of the information notified in some DCI fields of any DCI format of the existing specifications and at least a portion of the resource information of some DCI format / SS / CORESET / PDCCH of any DCI format of the existing specifications may be received / notified on a sequence basis.

[0053] 1 is a diagram illustrating an example of reception of DCI (DMRS-based DCI) in existing specifications. DCI1 may notify M bits of information to a UE.

[0054] FIG. 2 is a diagram showing an example of (1) above. The sequence-based DCI 2-1 notifies the UE of x (x<M) bits of information, which is at least a portion of the information notified in the DMRS-based DCI (the M-bit information notified in DCI1 in FIG. 1 ), and the DMRS-based DCI 2-2 may notify the UE of M-x bits of information (the M-bit information notified in DCI1 in FIG. 1 , other than the information notified in the sequence-based DCI 2-1). The sequence-based DCI 2-1 may have resources determined by higher layer signaling or the like, or may be blind decoded by the UE. The DMRS-based DCI 2-2 may be blind decoded by the UE.

[0055] FIG. 3 is a diagram showing an example of the above (2). The sequence-based DCI 3-1 notifies the UE of information for identifying the DMRS-based DCI 3-2 (for example, information regarding the resources of the DMRS-based DCI 3-2 (which may be the same as the "information for narrowing down PDCCH candidates" described later)), and the DMRS-based DCI 3-2 may notify the UE of M bits of information. The resources of the sequence-based DCI 3-1 may be determined by higher layer signaling or the like, or the UE may perform blind decoding. The DMRS-based DCI 3-2 may be decoded based on the information of the sequence-based DCI 3-1, but may not be blind decoded.

[0056] 4 is a diagram showing an example of the above (3). Sequence-based DCI 4 may notify a UE of x bits of information that is at least a part of the information notified by the DMRS-based DCI (M bits of information notified by DCI 1 in FIG. 1 ).

[0057] Note that the sequence-based DCI2-1 and sequence-based DCI3-1 may be received / notified using a DMRS base instead of a sequence base.

[0058] Furthermore, new DCI formats may be defined for the above sequence-based DCI 2-1, DMRS-based DCI 2-2, sequence-based DCI 3-1, and sequence-based DCI 4. The DCI format for the DMRS-based DCI 3-2 may be associated with the sequence-based DCI (sequence-based DCI 3-1). This association may be defined in advance or may be notified to the UE by the RRC / MAC CE.

[0059] According to (1) above, part of the information of the DMRS-based DCI (for example, UL / DL allocation, payload / DCI field configuration, etc.) can be notified to the UE in advance by the sequence-based DCI.

[0060] According to the above (2), the UE only needs to attempt to detect the DMRS-based DCI in the resources indicated by the sequence-based DCI, which reduces the number of PDCCH candidates / DCI candidates to be monitored. In other words, the UE does not need to monitor (blind decode) PDCCH candidates for the DMRS-based DCI of a specific DCI format (e.g., the DCI format for the above-mentioned DMRS-based DCI3-2) in resources other than those indicated by the sequence-based DCI.

[0061] According to (3) above, resource efficiency can be further improved.

[0062] In the case of (1) and / or (2) above, the UE may assume that the following relationships / restrictions exist between a PDCCH linked to a sequence base (which may be interpreted as DCIX-1, a PDCCH of DCIX-1, a sequence-based DCI, a sequence-based PDCCH, etc.) and a PDCCH linked to a DCI modulated using a specific modulation method (e.g., Quadrature Phase Shift Keying (QPSK)) or a PDCCH including DMRS (which may be interpreted as DCIX-2, a PDCCH of DCIX-2, a DMRS-based DCI, a DMRS-based PDCCH, etc.).

[0063] [Frequency Relationship Between DCIX-1 and DCIX-2] The UE may assume that the following (i) and / or (ii) exists as the frequency relationship (frequency direction restriction, frequency resource association) between DCIX-1 and DCIX-2: (i) The CCE index of DCIX-1 and the CCE index of DCIX-2 are the same, or the difference between these CCE indices is within a predetermined number (Y). (ii) The physical resource block (PRB) to which DCIX-1 is assigned and the PRB to which DCIX-2 is assigned are the same, or the difference between these PRBs is within a predetermined number (Y) RBs.

[0064] [Temporal Relationship Between DCIX-1 and DCIX-2] The UE may assume that the following (iii) and / or (iv) exists as the temporal relationship (time direction restrictions, time resource association) between DCIX-1 and DCIX-2: (iii) The first symbol of DCIX-2 is allocated Z milliseconds (which may be read as symbols or slots, etc.) after the last symbol of DCIX-1. (iv) The last symbol of DCIX-2 is allocated Z milliseconds (which may be read as symbols or slots, etc.) after the first or last symbol of DCIX-1.

[0065] The relationships / restrictions in (i) to (iv) above may be combined. Note that the first / last symbols in (iii) / (iv) above may be replaced with any symbols (e.g., the first, last, or i-th (i is an integer) symbol).

[0066] The values ​​of Y and Z in (i) to (iv) above may be any predetermined value, may be values ​​based on UE capability information, or may be values ​​based on set / instructed parameters (e.g., upper layer parameters, etc.).

[0067] 5 is a diagram showing an example of the above (iii) / (iv). In FIG. 5, in the period (Z) from the first / last symbol of DCIX-1 to the first / last symbol of DCIX-2, transmission and reception of a specific channel (for example, PDSCH / PUSCH) may not be performed.

[0068] <Method for Receiving Sequence-Based DL Data> A UE may receive sequence-based DL data while searching PDCCH candidates. In the present disclosure, PDCCH candidates may be interchangeably read as DCI candidates.

[0069] For PDCCH candidates for sequence-based DL data, at least one of the following may be specified by the specification according to (or for) the RNTI / SS / CORESET / aggregation level, and may be signaled to the UE using the RRC / MAC CE: Periodicity / Symbol / Slot / Time Offset Sequence Length / Sequence Format Starting Resource Element (RE) / Starting Resource Block (RB) / Starting Resource Block Group (RBG) / Starting Subband / Starting Symbol / Starting Slot Number of REs / Number of RBs / Number of RBGs / Number of Subbands / Number of Symbols / Number of Slots Density per RB / RBG / Subband / Symbol / Slot Bitmap Indication per RE / RB / RBG / Subband / Symbol / Slot

[0070] The UE may receive sequence-based DL data using at least one of the following reception methods 1 to 3.

[0071] [Reception Method 1] The UE may determine whether or not a PDCCH candidate can be received based on whether or not a measurement value of the PDCCH candidate exceeds a threshold.

[0072] Figure 6 is a diagram showing an example of multiple PDCCH candidates monitored by a UE. In this example, the same sequence-based DCIX may be transmitted in three PDCCH candidates. In Figure 6, the UE may attempt to receive each PDCCH candidate in the order of DCIX candidate 1, DCIX candidate 2, and DCIX candidate 3. Note that the order in which the UE attempts to receive each PDCCH candidate is not limited to this order. The UE may also attempt to receive multiple PDCCH candidates simultaneously.

[0073] The number of PDCCH candidates / upper limit number / reception attempt order may be determined in advance or may be determined based on parameters notified by RRC / MAC CE.

[0074] As the measurement value, at least one of the following metrics may be predetermined, or the metric to be used may be notified to the UE by the RRC / MAC CE: RSRP / RSRQ / SINR Autocorrelation / Cross-correlation

[0075] The threshold value may be determined in advance or may be notified to the UE using RRC / MAC CE.

[0076] [Reception Method 2] Different information may be included in multiple PDCCH candidates.

[0077] 7 is a diagram showing an example of a case in which different information is received / notified on a sequence basis for multiple PDCCH candidates. x-bit information may be notified for DCI candidate 1, and y-bit information may be notified for DCI candidate 3. Alternatively, a PDCCH candidate may be determined for each piece of detected information. Information regarding which information is notified in which PDCCH candidate may be notified to the UE by RRC / MAC CE.

[0078] The PDCCH candidates may be a combination of sequence-based PDCCHs and PDCCHs of existing specifications, and the sequence-based PDCCH may notify the UE of at least one of the aggregation level, CCE index, symbol, slot, RNTI, and DCI format as information for narrowing down the PDCCH candidates in the PDCCH of existing specifications.

[0079] Based on the information for narrowing down PDCCH candidates, PDCCH candidates in a PDCCH of existing specifications to be monitored (a set of PDCCH candidates corresponding to at least one of a certain aggregation level, CCE index, symbol, slot, RNTI, and DCI format) may be narrowed down / limited / specified to one or more candidates. When the set is narrowed down / limited / specified to one candidate based on the information for narrowing down PDCCH candidates, the UE may attempt to receive only the one candidate without monitoring (blind decoding) PDCCH candidates other than the one candidate in the set. When the set is narrowed down / limited / specified to multiple candidates based on the information for narrowing down PDCCH candidates, the UE may monitor (blind decoding) the multiple candidates in the set and not monitor the other candidates.

[0080] 8A and 8B are diagrams showing an example of narrowing down DCI candidates. In Fig. 8A, the UE attempts to receive each DCI candidate in the order of legacy DCI candidate 1, legacy DCI candidate 2, legacy DCI candidate 3, and legacy DCI candidate 4. On the other hand, in Fig. 8B, the legacy DCI candidates are narrowed down using sequence-based DCI, and the UE attempts to receive each DCI candidate in the order of legacy DCI candidate 2 and legacy DCI candidate 4 without attempting to receive legacy DCI candidate 1 and legacy DCI candidate 3.

[0081] PDCCH candidates may be determined for each sequence-based DCI and DCI modulated using a particular modulation scheme (e.g., QPSK).

[0082] Based on a particular DCI (e.g., sequence-based DCI), the PDCCH / PDCCH candidate / DCI format / RNTI to use for detection for a different DCI (e.g., DCI modulated using QPSK) may be determined.

[0083] [Reception Method 3] In sequence-based DL data, information on resources / sequences may be notified to the UE in advance, and the UE may receive DCI in the notified resources / assuming the notified sequence.

[0084] The UE may be provided with at least one of the following according to the DL information bits / RNTI / SS / CORESET / aggregation level of the PDCCH candidate / DCI candidate, and may be notified by the RRC / MAC CE: RE / RB / RBG level offset / symbol / slot / time offset Sequence length / sequence format Start RE / start RB / start RBG / start subband / start symbol / start slot Number of REs / number of RBs / number of RBGs / number of subbands / number of symbols / number of slots Density per RB / RBG / subband / symbol / slot Bitmap indication per RE / RB / RBG / subband / symbol / slot

[0085] <Sequence Generation for Sequence-Based DL Data> A sequence generation method for sequence-based DL data may be specified. A base station may transmit a sequence-based PDCCH based on a reference sequence. Specifically, the base station may generate a transmission signal for the sequence-based PDCCH by applying phase rotation / cyclic shift (CS) to the reference sequence.

[0086] Sequence-based PDCCH information (DL data) may be reported via CS (FIGS. 9 and 10).

[0087] The transmission signal generation process for sequence-based PDCCH is performed using a reference sequence X ０ -X Ｍ－１ may be phase-rotated (cyclically shifted) using a selected phase rotation amount α, and the phase-rotated reference sequence may be input to an Orthogonal Frequency Division Multiplexing (OFDM) transmitter or a Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) transmitter. The base station may transmit an output signal from the OFDM transmitter or the DFT-S-OFDM transmitter.

[0088] FIG. 9 is a diagram showing an example of the association between sequence-based PDCCH information and the amount of phase rotation. In the sequence-based PDCCH, multiple phase rotation candidates for a base sequence may be assigned. For example, when transmitting a 2-bit sequence-based PDCCH, four code resource candidates (e.g., phase rotation amounts) may be assigned. In this example, the phase rotation amount α is assigned to sequence-based PDCCH information 0-3. ０ , α ３ , α6, and α9 are associated with them, respectively.

[0089] Fig. 10 is a diagram showing an example of a transmission signal generation process for a sequence-based PDCCH based on the association shown in Fig. 9. In Fig. 10, the sequence length of the base sequence is 12, and when information 0 is reported as the sequence-based PDCCH, the base station generates a base sequence X ０ -X １１ , the phase rotation amount α associated with information 0 ０ Similarly, when transmitting information 1-3 as a sequence-based PDCCH, the base station performs phase rotation using the reference sequence X ０ -X １１ , the phase rotation amount α associated with the information 1-3 ３ , α6 and α9 are used to perform phase rotation.

[0090] In the present disclosure, a base station transmitting a sequence-based PDCCH based on a certain sequence (in other words, using a certain sequence for (generating) a sequence-based PDCCH) may be interpreted as a UE performing reception processing (decoding, etc.) of the sequence-based PDCCH assuming that sequence. Also, in the present disclosure, a UE receiving / detecting a sequence-based PDCCH may be interpreted as a base station transmitting that sequence-based PDCCH.

[0091] The reference sequence for the sequence-based PDCCH may be one or more of a pseudo-random sequence, a Zadoff-Chu (ZC) sequence, a Computer Generated (CG) sequence, and an M-sequence. The pseudo-random sequence may be a sequence as described in existing 3GPP TS 38.211, Section 5.2.1. The ZC sequence may be a sequence as described in existing 3GPP TS 38.211, Section 5.2.2.1. The CG sequence may be a sequence as described in existing 3GPP TS 38.211, Section 5.2.2.2. The M-sequence may be a sequence as described in existing 3GPP TS 38.211, Section 7.4.2.2.1.

[0092] Different reference sequences may be used based on specific conditions. For example, the base station may use a first reference sequence (e.g., including one or more of a pseudo-random sequence, a ZC sequence, a CG sequence, and an M sequence) as the reference sequence for the sequence-based PDCCH when a specific condition is met, and may use a second reference sequence (e.g., including one or more of a pseudo-random sequence, a ZC sequence, a CG sequence, and an M sequence) when a specific condition is not met. The specific condition may be determined in advance or may be configured in the UE by the RRC / MAC CE. Note that the first reference sequence and the second reference sequence may be different types of sequences (e.g., a ZC sequence and an M sequence) or may be the same type of sequence but based on different parameters / indexes / equations.

[0093] The specific condition may include a condition based on a sequence length. For example, the base station may use a first reference sequence (e.g., a CG sequence) when the sequence length is less than X, and may use a second reference sequence (e.g., a ZC sequence) when the sequence length is X or greater.

[0094] The specific condition may include a condition based on the payload size (transmission data length) of the DCI. For example, the base station may use a first reference sequence (e.g., a CG sequence) when the payload size of the DCI is less than X, and may use a second reference sequence (e.g., a ZC sequence) when the payload size of the DCI is X or more.

[0095] The specific condition may include a condition based on the SS / aggregation level / CORESET / DCI format / cell ID of the DCI. For example, the base station may use a first reference sequence (e.g., a CG sequence) if the SS receiving the DCI is a UE-specific search space set (USS), and may use a second reference sequence (e.g., a ZC sequence) if the SS receiving the DCI is a common search space set (CSS).

[0096] The specific condition may include a condition based on an aggregation level of the DCI. For example, the base station may use a first reference sequence (e.g., a CG sequence) when the aggregation level of the DCI is a first value (e.g., 1), and may use a second reference sequence (e.g., a ZC sequence) when the aggregation level of the DCI is a second value (e.g., 8).

[0097] The specific condition may include a condition based on the CORESET in which the DCI is received. For example, the base station may use a first reference sequence (e.g., a CG sequence) when the CORESET in which the DCI is received is a first CORESET, and may use a second reference sequence (e.g., a ZC sequence) when the CORESET in which the DCI is received is a second CORESET.

[0098] The specific condition may include a condition based on the DCI format. For example, the base station may use a first reference sequence (e.g., a CG sequence) when the DCI is in a first DCI format, and may use a second reference sequence (e.g., a ZC sequence) when the DCI is in a second DCI format.

[0099] The specific condition may include a condition based on the RNTI used to scramble the CRC of the DCI. For example, the base station may use a first reference sequence (e.g., an M sequence) when the RNTI used to scramble the CRC of the DCI is a first RNTI (e.g., a System Information RNTI (SI-RNTI)), and may use a second reference sequence (e.g., a CG sequence) when the RNTI used to scramble the CRC of the DCI is a second RNTI (e.g., a Cell RNTI (C-RNTI)).

[0100] The specific condition may include a condition based on a cell ID. For example, the base station may use a first reference sequence (e.g., a CG sequence) when transmitting the DCI in a first cell and a second reference sequence (e.g., a ZC sequence) when transmitting the DCI in a second cell.

[0101] The specific condition may include a combination of the above conditions. For example, the base station may use a first base sequence (e.g., a CG sequence) when the SS receiving the DCI is a USS and the DCI format of the DCI is a first DCI format, and may use a second base sequence (e.g., a ZC sequence) when the SS receiving the DCI is a CSS or when the DCI format of the DCI is a second DCI format.

[0102] It should be noted that "less than X" may be read as "equal to or less than X." Furthermore, "equal to or greater than X" may be read as "greater than X."

[0103] <Linking of Series-Based DL Data> In series-based DL data, linking of parameters and series may be defined.

[0104] Depending on the DCI / RNTI / SS / CORESET, different reference sequences may be used, or multiple reference sequences may be used.

[0105] The base sequence associated with the DCI / RNTI / SS / CORESET may be defined by a specification or may be signaled by the RRC / MAC CE. In addition, the base sequence index may be changed / determined depending on the type of RNTI / SS / DCI.

[0106] For example, when RNTI=0x8000, the index of the first base sequence used for PDCCH transmission may be set to 0, and when RNTI=0x8001, the index of the first base sequence may be set to 1. Furthermore, when RNTI=0x9000, the index of the second base sequence (a sequence different from the first base sequence) used for PDCCH transmission may be set to 0, and when RNTI=0x9001, the index of the second base sequence may be set to 1.

[0107] The reference sequence associated with the DCI / RNTI / SS may be based on the premise of being received multiple times.

[0108] For example, the UE may receive, for the first time, a sequence-based PDCCH corresponding to a reference sequence indicating an ACK / NACK for an UL transmission, and may receive, for the second time, a sequence-based PDCCH corresponding to a reference sequence indicating information specifying resources for initial transmission / retransmission.

[0109] A plurality of sequence-based PDCCHs having the same type of base sequence may be multiplexed using TDM / FDM / Space Division Multiplexing (SDM) / Code Division Multiplexing (CDM).

[0110] Depending on (or for each) DCI / RNTI / SS / CORESET / aggregation level, at least one of the following may be predefined, or a parameter for specifying the relevant value may be signaled to the UE using RRC / MAC CE: Phase rotation amount in CS Frequency resource Time resource

[0111] The number of UEs that receive the same DCI is not limited to one, and multiple UEs may receive the same DCI. For example, UEs with the same SS / RNTI (UEs to which the same SS / RNTI is set for receiving DCI) may receive the same DCI (e.g., broadcast information).

[0112] <Multiplexing of Sequence-Based DL Data> Sequence-based DL data may be transmitted using TDM / FDM / SDM / CDM with at least one of the following: a reference sequence; a CS (phase rotation amount); a frequency resource; and a time resource.

[0113] A different reference sequence may be configured for each UE / SS / CORESET / DCI format by the RRC / MAC CE.

[0114] A different amount of CS phase rotation may be set for each UE / SS / CORESET / DCI format by RRC / MAC CE.

[0115] Different time resources may be configured for each UE / SS / CORESET / DCI format by the RRC / MAC CE.

[0116] Different frequency resources may be configured for each UE / SS / CORESET / DCI format by RRC / MAC CE.

[0117] <Supplementary Information> [Notification of Information to UE] In the above-described embodiments, any information may be notified to the UE (from a network (NW) (e.g., a base station (BS))) (in other words, reception of any information from the BS by the UE) using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0118] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader, which is not defined in existing standards.

[0119] When the notification is made by DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0120] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0121] [Notification of Information from UE] In the above-described embodiments, notification of any information from the UE (to the NW) (in other words, transmission / report of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0122] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new LCID, which is not defined in existing standards, in the MAC subheader.

[0123] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0124] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0125] [Application of Each Embodiment] At least one of the above-described embodiments may be applied when a specific condition is met. The specific condition may be defined in a standard or may be notified to a UE / BS using higher layer signaling / physical layer signaling.

[0126] At least one of the above-described embodiments may be applied only to UEs that have reported or support a particular UE capability.

[0127] The specific UE capabilities may indicate at least one of the following: - Supporting specific processing / operation / control / information for at least one of the above embodiments; - Supporting sequence-based PDCCH transmission; - Supporting guaranteed minimum quality operation.

[0128] Furthermore, the above-mentioned specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or may be a capability for each frequency (e.g., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), or may be a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or may be a capability for each subcarrier spacing (SubCarrier Spacing (SCS)), or may be a capability for each Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

[0129] Furthermore, the specific UE capability may be a capability that is applied to all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (e.g., Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

[0130] Furthermore, at least one of the above-described embodiments may be applied when a UE is configured / activated / triggered with specific information related to the above-described embodiment (or performing the operations of the above-described embodiment) by higher layer signaling / physical layer signaling. For example, the specific information may be information indicating that sequence-based PDCCH transmission is enabled, any RRC parameter for a specific release (e.g., Rel. 18 / 19), etc.

[0131] If the UE does not support at least one of the specific UE capabilities or is not configured with the specific information, the UE may apply, for example, Rel. 15 / 16 behavior.

[0132] (Supplementary Notes) The following inventions are supplementary notes regarding one embodiment of the present disclosure. [Supplementary Note 1] A terminal having: a receiver that receives sequence-based first downlink control information (DCI) that does not use a demodulation reference signal (DMRS); and a controller that controls reception of a second DCI that uses DMRS, based on the first DCI. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the first DCI includes first information, and the second DCI includes second information that is not indicated in the first information. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the first DCI includes information related to a resource of the second DCI. [Supplementary Note 4] The terminal according to any one of Supplementary Notes 1 to 3, wherein the receiver obtains the first DCI based on a base sequence associated with a search space set for the first DCI.

[0133] (Wireless Communication System) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0134] 11 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (which may be simply referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0135] The wireless communication system 1 may also 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.

[0136] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (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.

[0137] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0138] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0139] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0140] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.

[0141] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0142] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0143] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0144] The core network 30 may include network functions (Network Functions (NF)) such as a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM). A single network node may provide multiple functions. Communication with an external network (e.g., the Internet) may also be performed via the DN.

[0145] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0146] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0147] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0148] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0149] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), or the like may be used as an uplink channel.

[0150] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0151] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0152] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0153] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0154] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0155] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0156] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0157] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0158] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as a reference signal.

[0159] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0160] (Base Station) Fig. 12 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0161] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0162] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0163] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0164] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0165] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, the RF unit 122, and a measurement unit 123.

[0166] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0167] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0168] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0169] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0170] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0171] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0172] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0173] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0174] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may 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 may be output to the control unit 110.

[0175] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes that provide NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0176] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0177] The transceiver 120 may transmit sequence-based first downlink control information (DCI) that does not use a demodulation reference signal (DMRS). The sequence-based first downlink control information (DCI) that does not use a demodulation reference signal (DMRS) may be interpreted as sequence-based DCI.

[0178] The control unit 110 may control transmission of a second DCI using DMRS based on the first DCI. The second DCI using DMRS may be interpreted as a DMRS-based DCI.

[0179] (User Terminal) Fig. 13 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0180] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0181] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0182] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0183] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0184] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0185] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0186] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0187] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0188] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0189] The transmitter / receiver unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0190] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it may not be necessary to perform DFT processing as the transmission processing.

[0191] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0192] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.

[0193] The transceiver unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0194] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may 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 may be output to the control unit 210.

[0195] The measurement unit 223 may derive channel measurements for CSI calculation based on the channel measurement resources. The channel measurement resources may be, for example, non-zero power (NZP) CSI-RS resources. The measurement unit 223 may also derive interference measurements for CSI calculation based on the interference measurement resources. The interference measurement resources may be at least one of an NZP CSI-RS resource for interference measurement, a CSI-Interference Measurement (IM) resource, etc. Note that CSI-IM may be referred to as CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS. Note that in the present disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be interchangeably read as interchangeable.

[0196] The transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0197] The transceiver 220 may receive sequence-based first downlink control information (DCI) that does not use a demodulation reference signal (DMRS). The sequence-based first downlink control information (DCI) that does not use a demodulation reference signal (DMRS) may be interpreted as sequence-based DCI.

[0198] The controller 210 may control reception of a second DCI using DMRS based on the first DCI. The second DCI using DMRS may be interpreted as a DMRS-based DCI.

[0199] The first DCI may include first information, and the second DCI may include second information that is not notified in the first information. The first information may be x (x<M) bits of information that is at least a part of the information notified in the DMRS-based DCI (M bits of information notified in DCI1 in FIG. 1 ). In this case, the second information may be M−x bits of information that is not notified in the first information, out of the information notified in the DMRS-based DCI (M bits of information notified in DCI1 in FIG. 1 ). Furthermore, the first information may be information for identifying the second DCI (DMRS-based DCI).

[0200] The first DCI may include information about resources of the second DCI, which may be at least a part of resource information (e.g., aggregation level, DCI format, control channel element (CCE) index, etc.) of any DCI format / search space set (SS) / CORESET / PDCCH of an existing specification (DMRS-based).

[0201] The transceiver 220 may acquire the first DCI based on a reference sequence associated with a search space set for the first DCI. The search space set may be a CSS or a USS. The reference sequence may include one or more of a pseudo-random sequence, a ZC sequence, a CG sequence, and an M sequence.

[0202] The resources of the second DCI may be associated with at least one of frequency resources and time resources of the first DCI.

[0203] (Hardware Configuration) Note that the block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0204] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As described above, the implementation method of each is not particularly limited.

[0205] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 14 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0206] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0207] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0208] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0209] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0210] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0211] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0212] Storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0213] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0214] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0215] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0216] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0217] (Modifications) Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0218] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0219] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0220] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0221] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0222] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0223] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0224] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0225] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0226] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0227] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0228] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0229] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0230] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI, each of which may be composed of one or more resource blocks.

[0231] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0232] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0233] A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0234] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0235] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0236] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0237] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0238] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0239] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0240] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0241] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0242] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0243] Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0244] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0245] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0246] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0247] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), these wired and / or wireless technologies are included within the definition of transmission media.

[0248] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0249] In this disclosure, terms such as "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," "layer," "number of layers," "rank," "resource," "resource set," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," "UE panel," "transmitting entity," "receiving entity," etc. may be used interchangeably.

[0250] In the present disclosure, the term "antenna port" may be interchangeably read as an antenna port for any signal / channel (e.g., a demodulation reference signal (DMRS) port). In the present disclosure, the term "resource" may be interchangeably read as a resource for any signal / channel (e.g., a reference signal resource, an SRS resource, etc.). The resource may include time / frequency / code / space / power resources. Furthermore, the spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0251] The group may include, for example, at least one of a spatial relationship group, a Code Division Multiplexing (CDM) group, a Reference Signal (RS) group, a Control Resource Set (CORESET) group, a PUCCH group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, and the like.

[0252] In addition, in the present disclosure, beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable terms.

[0253] In addition, in the present disclosure, the terms TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, joint TCI state, etc. may be read interchangeably.

[0254] Furthermore, in the present disclosure, terms such as "QCL," "QCL assumption," "QCL relationship," "QCL type information," "QCL property / properties," "specific QCL type (e.g., Type A, Type D) property," and "specific QCL type (e.g., Type A, Type D)" may be interchangeable.

[0255] In the present disclosure, terms such as index, identifier (ID), indicator, indication, and resource ID may be interchangeable. In the present disclosure, terms such as sequence, list, set, group, cluster, and subset may be interchangeable.

[0256] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information (TCI state)" may be interchangeable with "set of spatial relationship information (TCI state)", "one or more pieces of spatial relationship information", etc. The TCI state and the TCI may be interchangeable. The spatial relationship information and the spatial relationship may be interchangeable.

[0257] In the present disclosure, terms such as "base station (BS)," "radio 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," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0258] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0259] In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control / operate based on the information.

[0260] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0261] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0262] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0263] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0264] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0265] 15 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0266] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0267] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0268] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0269] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0270] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0271] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0272] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0273] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Furthermore, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (or may function as at least one of the base station 10 and the user terminal 20).

[0274] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0275] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0276] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0277] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as an uplink channel and a downlink channel may be read as a sidelink channel.

[0278] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0279] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0280] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0281] Each aspect / embodiment described in the present disclosure may be a technology other than Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0282] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0283] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0284] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0285] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0286] Furthermore, "determination" may be considered to be "determining" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "determining" some kind of action. In the present disclosure, "determination" may be read interchangeably with the above-mentioned actions.

[0287] Furthermore, in this disclosure, "determine / determining" may be interchangeably read as "assume / assuming," "expect / expecting," "consider / considering," etc. Furthermore, in this disclosure, "does not expect to do..." may be interchangeably read as "assumes not to do...."

[0288] In the present disclosure, "expect" may be interchangeably read as "be expected." For example, "expect(s) ..." ("..." may be expressed, for example, as a that clause, a to-infinitive, etc.) may be interchangeably read as "be expected ...." "does not expect ..." may be interchangeably read as "be not expected ...." Furthermore, "An apparatus A is not expected ..." may be interchangeably read as "an apparatus B other than apparatus A does not expect ... from apparatus A" (e.g., if apparatus A is a UE, apparatus B may be a base station).

[0289] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0290] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0291] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0292] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0293] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0294] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0295] In the present disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be interchangeable. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative, as expressions with "i-th" (i is an arbitrary integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0296] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0297] In the present disclosure, terms such as "when A, B," "if A, (then) B," "B upon A," "B in response to A," "B based on A," "B during / while A," "B before A," "B at (the same time as) / on A," "B after A," "B since A," and "B until A" may be interchangeable. Note that A, B, and the like herein may be replaced with appropriate expressions such as nouns, gerunds, and regular sentences, depending on the context. Note that the time difference between A and B may be approximately zero (immediately after or immediately before). A time offset may also be applied to the time at which A occurs. For example, "A" may be interchangeable with "before / after a time offset at which A occurs." The time offset (eg, one or more symbols / slots) may be predefined or may be specified by the UE based on signaled information.

[0298] In the present disclosure, timing, time, duration, time instance, any time unit (e.g., slot, subslot, symbol, subframe), period, occasion, resource, etc. may be read interchangeably.

[0299] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The description of the present disclosure is for illustrative purposes only and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A terminal having a receiving unit that receives sequence-based first downlink control information (DCI) that does not use a demodulation reference signal (DMRS), and a control unit that controls reception of a second DCI that uses DMRS based on the first DCI.

2. The terminal according to claim 1, wherein the first DCI includes first information, and the second DCI includes second information that is not notified in the first information.

3. The terminal of claim 1, wherein the first DCI includes information regarding resources of the second DCI.

4. The terminal of claim 1, wherein the receiver acquires the first DCI based on a base sequence associated with a search space set for the first DCI.

5. A wireless communication method for a terminal, comprising: a step of receiving sequence-based first downlink control information (DCI) without using a demodulation reference signal (DMRS); and a step of controlling reception of a second DCI using DMRS based on the first DCI.

6. A base station having a transmitter that transmits sequence-based first downlink control information (DCI) without using a demodulation reference signal (DMRS), and a control unit that controls transmission of a second DCI using the DMRS based on the first DCI.

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