Terminal, wireless communication method, base station and system

Abstract

A terminal according to one embodiment of the present disclosure comprises: a reception unit that receives at least one reference signal setting and information relating to a reference signal; and a control unit that determines an applicable period for information relating to the reference signal, and determines mapping of the reference signal on the basis of the reference signal setting and the information relating to the reference signal. According to one embodiment of the present disclosure, it is possible to realize suitable RS resource utilization.

Description

[Technical Field]

[0001] The present disclosure relates to a terminal and a wireless communication method in a next-generation mobile communication system. 、 base station and systems Regarding. [Background technology]

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was specified with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP) 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) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0005] Regarding future wireless communication technologies, the use of artificial intelligence (AI) techniques such as machine learning (ML) for network / device control and management is being considered. For example, the use of AI / ML complementation to reduce reference signal (RS) resources is being considered.

[0006] However, the specifics of the RS resource reduction have not yet been fully explored. Unless these are properly defined, highly efficient resource utilization cannot be achieved, and there is a risk that improvements in communication throughput or communication quality will be hindered.

[0007] Therefore, the present disclosure provides a terminal and a wireless communication method that can realize optimal use of RS resources. 、 base station and systems One of the aims is to provide [Means for solving the problem]

[0008] A terminal according to one aspect of the present disclosure includes: a receiving unit that receives one or more reference signal configurations and information related to the reference signals; and a control unit that determines an application period of the information related to the reference signals and determines mapping of the reference signals based on the reference signal configurations and the information related to the reference signals. If the reference signal is a reference signal for a channel scheduled over a plurality of slots, the control unit applies information about the reference signal to all of the channels. do. [Effects of the Invention]

[0009] According to one aspect of the present disclosure, it is possible to realize optimal utilization of RS resources. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram illustrating an example of setting of a reference signal according to option 1-1 of the first embodiment. [Figure 2] FIG. 2 is a diagram illustrating an example of setting of a reference signal according to option 1-2 of the first embodiment. [Figure 3] FIG. 3 is a diagram illustrating an example of conditions related to a reference signal according to the first embodiment. [Figure 4] 4A and 4B are diagrams showing an example of sampling of a reference signal. [Figure 5] 5A and 5B are diagrams showing an example of mapping of reference signals according to the second embodiment. [Figure 6] FIG. 6 is a diagram showing another example of mapping of reference signals according to the second embodiment. [Figure 7] 7A and 7B are diagrams showing an example of mapping of reference signals according to option 2-2-1 of the second embodiment. [Figure 8] FIG. 8 is a diagram illustrating an example of mapping of reference signals according to option 2-2-2 of the second embodiment. [Figure 9] 9A and 9B are diagrams showing an example of determining a sequence according to option 2-3-2 of the second embodiment. [Figure 10] 10A and 10B are diagrams illustrating an example of application of information related to a reference signal according to option 4-1 of the fourth embodiment. [Figure 11] 11A and 11B are diagrams illustrating an example of application of information related to a reference signal according to option 4-2 of the fourth embodiment. [Figure 12] FIG. 12 is a diagram illustrating an example of overlapping of reference signals according to the fifth embodiment. [Figure 13] FIG. 13 is a diagram showing an example of determining the PDSCH decoding time according to option 6-2 of the sixth embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of the bit width of the MAC CE / DCI field according to option 7-1 of the seventh embodiment. [Figure 15] FIG. 15 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 16]FIG. 16 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 17] FIG. 17 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 18] FIG. 18 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. [Figure 19] FIG. 19 is a diagram illustrating an example of a vehicle according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] (Application of Artificial Intelligence (AI) technology to wireless communications) Regarding future wireless communication technologies, the use of AI technology for network / device control and management is being considered.

[0012] For example, in future wireless communication technologies, particularly in communications using beams, there is a demand for high accuracy in channel estimation (which may also be called channel measurement) for beam management, decoding of received signals, and the like.

[0013] Channel estimation may be performed using at least one of, for example, a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal (SS), a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Demodulation Reference Signal (DMRS), a Sounding Reference Signal (SRS), etc.

[0014] Regarding future wireless communication technologies, the use of artificial intelligence (AI) technologies such as machine learning (ML) for network / device control and management is being considered.

[0015] For example, AI / ML complementation is being considered to reduce reference signal (RS) resources while maintaining channel estimation accuracy.

[0016] For example, if AI / ML-based learning has not been performed (or completed) in a terminal (user terminal, also known as User Equipment (UE)) or base station, the following requirements may be necessary to achieve RS reception measurements that enable high channel estimation accuracy or accurate RS reception measurements used for learning: - Transmitting and receiving RS in a wide band (contributing to improved reception quality), Repeatedly transmitting RS to combine received channels / signals (composite reception) at the receiving side (contributes to improved reception quality), · High time / frequency density of RS resources (contributes to obtaining good time / frequency correlation).

[0017] Considering these factors, it is thought that the appropriate allocation of RS will differ depending on whether AI / ML has been sufficiently trained or not. Therefore, it is desirable to introduce a method and framework for dynamically allocating appropriate RS resources.

[0018] However, the specifics of the framework have not yet been fully explored. Unless these are properly defined, it may be difficult to achieve highly efficient resource utilization, which may hinder improvements in communication throughput or communication quality.

[0019] In addition, in the existing specifications (up to Rel. 16), the mapping of reference signals (DMRS / PTRS) is specified to be set at the following granularity: · Per configured grant push. -By DCI format (DCI format 0_1 / 0_2 / 1_1 / 1_2). For each PUSCH / PDSCH mapping type A or B. Whether or not this is a PUSCH that transmits message A (Msg.A PUSCH).

[0020] In order to achieve highly efficient resource utilization as described above, it is desirable to introduce more flexible and dynamic reference signal mapping settings.

[0021] Therefore, the present inventors have devised a suitable method for allocating / using RS resources.

[0022] Note that the embodiments of the present disclosure may be applied when AI / ML / prediction is not used, in which case it is possible to change the RS configuration with reduced delay / overhead without RRC reconfiguration.

[0023] In one embodiment of the present disclosure, a UE / BS trains an ML model in a training mode and executes the ML model in a test mode (also referred to as a test mode, etc.), where the accuracy of the ML model trained in the training mode may be validated.

[0024] In the present disclosure, the UE / BS may input channel state information, reference signal measurements, etc. to the ML model and output highly accurate channel state information / measurements / beam selection / position, future channel state information / radio link quality, etc.

[0025] In this disclosure, AI may be interpreted as an object (also referred to as a subject, object, data, function, program, etc.) that has (performs) at least one of the following characteristics: · inferences based on observed or collected information; · making choices based on information observed or collected; · Predictions based on observed or collected information.

[0026] In the present disclosure, the object may be, for example, an apparatus, a device, etc., such as a terminal or a base station. The object may also correspond to a program included in the apparatus.

[0027] In addition, in the present disclosure, an ML model may be interpreted as an object having (implementing) at least one of the following characteristics: - Producing estimates by feeding information, · Predicting estimates by giving information, · Discover features by providing information, · Selecting behavior by providing information.

[0028] In the present disclosure, the term "ML model" may be interpreted as at least one of an AI model, predictive analytics, a predictive analysis model, etc. The ML model may be derived using at least one of regression analysis (e.g., linear regression analysis, multiple regression analysis, logistic regression analysis), a support vector machine, a random forest, a neural network, deep learning, etc. In the present disclosure, the term "model" may be interpreted as at least one of an encoder, a decoder, a tool, etc.

[0029] Based on input information, the ML model outputs at least one piece of information, such as an estimate, a prediction, a selected action, or a classification.

[0030] 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.

[0031] In the following embodiments, to explain an ML model for communication between a UE and a BS, the relevant entities are a UE and a BS, but application of each embodiment of the present disclosure is not limited to this. For example, for communication between other entities (e.g., communication between UEs), the UE and BS in the following embodiments may be read as a first UE and a second UE. In other words, the UE, BS, etc. in the present disclosure may all be read as any UE / BS.

[0032] In the present disclosure, "A / B" and "at least one of A and B" may be read interchangeably.

[0033] In the present disclosure, terms such as activate, deactivate, indicate, select, configure, update, and determine may be interchangeable. In the present disclosure, terms such as support, control, controllable, operate, and operable may be interchangeable.

[0034] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, information elements (IEs), and configurations may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, and activation / deactivation commands may be interchangeable.

[0035] In the present disclosure, the following terms may be used: panel, UE panel, panel group, beam, beam group, precoder, uplink (UL) transmitting entity, TRP, spatial relationship information (SRI), spatial relationship, SRS Resource Indicator (SRI), SRS resource, control resource set (CORESET), Physical Downlink Shared Channel (PDSCH), codeword, base station, reference signal, predetermined antenna port (e.g., Demodulation Reference Signal (DMRS) port), predetermined antenna port group (e.g., DMRS port group), predetermined group (e.g., Code Division Multiplexing (CDM) group, predetermined reference signal group, CORESET group), predetermined resource (e.g., predetermined reference signal resource), predetermined resource set (e.g., predetermined reference signal resource set), CORESET pool, PUCCH group (PUCCH resource group), spatial relationship group, downlink Transmission Configuration Indication state (TCI state) (DL Terms such as uplink TCI state, uplink TCI state (UL TCI state), unified TCI state, common TCI state, quasi-co-location (QCL), and QCL assumption may be read interchangeably.

[0036] In this disclosure, the terms index, ID, indicator, and resource ID may be interchangeable. In this disclosure, the terms sequence, list, set, group, group, cluster, and subset may be interchangeable.

[0037] In the present disclosure, beam reports may be interchangeably referred to as beam measurement reports, CSI reports, CSI measurement reports, predicted beam reports, predicted CSI reports, etc.

[0038] In the present disclosure, CSI-RS may be interchangeably read as at least one of Non-Zero Power (NZP) CSI-RS, Zero Power (ZP) CSI-RS, and CSI Interference Measurement (CSI-IM).

[0039] In this disclosure, the measured / reported RS may refer to the RS measured / reported for a beam report.

[0040] In the present disclosure, the terms timing, time, duration, slot, subslot, symbol, subframe, etc. may be interpreted as interchangeable.

[0041] In the present disclosure, the terms direction, axis, dimension, polarization, polarization component, etc. may be interpreted interchangeably.

[0042] In the present disclosure, estimation, prediction, and inference may be interchangeable. In the present disclosure, estimate, predict, and infer may be interchangeable.

[0043] In the present disclosure, the RS may be, for example, a CSI-RS, an SS / PBCH block (SS block (SSB)), etc. Furthermore, the RS index may be a CSI-RS resource indicator (CSI-RS resource indicator (CRI)), an SS / PBCH block resource indicator (SSBRI), etc.

[0044] In the present disclosure, CSI feedback, CSI feedback information, CSI report, CSI report, CSI transmission, CSI information, CSI, etc. may be interpreted as interchangeable.

[0045] In addition, in the present disclosure, a subband may be interchangeably read as a physical resource block (PRB), a subcarrier, an arbitrary frequency resource unit, and the like.

[0046] (Wireless communication method) The (specific) reference signal described in each embodiment of the present disclosure may be at least one of a demodulation reference signal (DMRS), a phase tracking reference signal (PTRS), or any other reference signal described in the present disclosure. In the present disclosure, the terms "reference signal," "DMRS," "PTRS," and any other reference signal described in the present disclosure may be interchangeable.

[0047] The reference signal described in each embodiment of the present disclosure may be a UL reference signal (a reference signal for a UL channel) or a DL reference signal (a reference signal for a DL channel).

[0048] In the following, in each embodiment of the present disclosure, a DMRS will be mainly described as an example, but the reference signal is not limited to a DMRS and can be applied to any reference signal.

[0049] In the present disclosure, the terms "assigning," "mapping," "transmitting," and "receiving" a reference signal may be read interchangeably.

[0050] First Embodiment In the first embodiment, a method for determining the mapping of reference signals will be described.

[0051] The UE may determine the mapping of the reference signal according to at least one of the following options 1-1 to 1-3.

[0052] Option 1-1 The UE may determine / select one reference signal configuration from multiple configurations for reference signals.

[0053] The determination / selection of the one reference signal configuration may be based on specific conditions / instructions from the base station, which will be described in detail later.

[0054] For example, the UE may determine / select one reference signal configuration (reference signal configuration X or reference signal configuration Y) from multiple reference signal configurations (reference signal configuration X and reference signal configuration Y) when transmitting a UL channel (e.g., PUSCH) and / or when receiving a DL channel (e.g., PDSCH).

[0055] The number of the multiple reference signal configurations may be 2 as described above, or may be a number greater than or equal to 2. In the present disclosure, reference signal configuration X may be interchangeably read as a first reference signal configuration, and reference signal configuration Y may be interchangeably read as a second reference signal configuration.

[0056] The UE may determine one reference signal configuration among the multiple reference signal configurations as the default reference signal configuration.

[0057] In the present disclosure, a default reference signal configuration may refer to a configuration that a UE selects / determines when it does not receive a signal specifying / instructing the selection / determination from a base station (network).

[0058] The multiple reference signal configurations (reference signal configuration X and reference signal configuration Y) may correspond to at least one of, for example, an uplink configuration of a demodulation reference signal (DMRS) (e.g., an upper layer parameter “DMRS-UplinkConfig”) and a downlink configuration of a demodulation reference signal (DMRS) (e.g., an upper layer parameter “DMRS-DownlinkConfig”).

[0059] The multiple reference signal configuration may be a configuration that includes at least one of the following elements / parameters: · Type of reference signal (e.g. DMRS) configuration. · Number of Code Division Multiplexing (CDM) groups (not used for data). Number of additional DMRS symbols. Maximum number of OFDM symbols for front loaded DMRS. · Frequency resources (e.g., subcarriers) on which to transmit the reference signal. The symbol position of the first DMRS (e.g., start DMRS) for a particular mapping type (e.g., mapping type A). · PTRS frequency density / time density. · The frequency (e.g. subcarrier) offset of the PTRS. Energy per resource element (EPRE) ratio between PTRS and DL channel (e.g., PDSCH). PTRS transmit power boosting factor.

[0060] Fig. 1 is a diagram illustrating an example of reference signal configuration according to option 1-1 of the first embodiment. In Fig. 1, the UE selects / determines one reference signal configuration from multiple reference signal configurations (DMRS configuration X and DMRS configuration Y) based on a specific condition / instruction from the base station.

[0061] In the example shown in Figure 1, DMRS setting X does not include a PTRS setting (at least one of elements / parameters related to the PTRS, for example, the frequency density / time density of the PTRS, the frequency (e.g., subcarrier) offset of the PTRS, the EPRE ratio between the PTRS and the DL channel (e.g., PDSCH), and the transmit power boosting factor of the PTRS), while DMRS setting Y includes at least one PTRS setting. Note that whether or not a PTRS setting is included in the settings of multiple reference signals may be optional.

[0062] In the example shown in FIG. 1, the UE selects / determines one DMRS configuration (DMRS configuration X) based on specific conditions / instructions from the base station.

[0063] Option 1-2 The UE may change / update some / all of the settings of one reference signal configuration based on specific conditions / instructions from the base station.

[0064] For example, the UE may change / update the mapping type of the reference signal of an already selected / configured reference signal configuration (DMRS configuration) and apply it to at least one of transmitting a UL channel (e.g., PUSCH) and receiving a DL channel (e.g., PDSCH).

[0065] Also, for example, the configuration to be changed / updated may be a configuration that includes at least one of the following elements / parameters: · Type of reference signal (e.g. DMRS) configuration. · Number of Code Division Multiplexing (CDM) groups (not used for data). Number of additional DMRS symbols. Maximum number of OFDM symbols for front loaded DMRS. · Frequency resources (e.g., subcarriers) on which to transmit the reference signal. The symbol position of the first DMRS (e.g., start DMRS) for a particular mapping type (e.g., mapping type A). · PTRS frequency density / time density. · The frequency (e.g. subcarrier) offset of the PTRS. ·EPRE ratio between PTRS and DL channel (e.g. PDSCH). PTRS transmit power boosting factor.

[0066] Fig. 2 is a diagram illustrating an example of reference signal configuration according to option 1-2 of the first embodiment. In Fig. 2, the UE changes some or all of the reference signal configuration from the already configured / selected reference signal configuration (DMRS configuration X) based on a specific condition / instruction from the base station.

[0067] 2, for example, the UE receives information from the base station instructing it to change the number of additional DMRS symbols. At this time, the UE changes the number of DMRS (additional DMRS) symbols based on the information.

[0068] In the example shown in Fig. 2, for example, the UE receives information from the base station instructing it to change the maximum number of OFDM symbols for the frontloaded DMRS. At this time, the UE changes the number of symbols for the DMRS (additional DMRS) based on the information.

[0069] Options 1-3 The above options 1-1 and 1-2 may be applied in combination.

[0070] For example, the UE may first use the above option 1-1 to select / determine one reference signal configuration for a certain channel, and then use the above option 1-2 to change / update the reference signal configuration for the channel.

[0071] Also, for example, the UE may first use the above option 1-1 to select / determine one reference signal configuration for a certain channel (first channel). Then, the UE may use the above option 1-2 to change / update the reference signal configuration for the first channel. Furthermore, the UE may use the above option 1-1 to select / determine one reference signal configuration for a channel (second channel) different from the first channel. Then, the UE may use the above option 1-2 to change / update the reference signal configuration for the second channel.

[0072] In this way, when selecting / determining / changing / updating reference signal configuration for multiple different channels, the UE may ignore the configuration / change of the first channel.

[0073] Furthermore, when reference signal configurations are selected / determined / changed / updated for multiple different channels in this manner, the UE may maintain the configuration / change of the first channel.

[0074] The following describes the above specific conditions / instructions from the base station.

[0075] The UE may receive instructions regarding the mapping of reference signals from the base station (network).

[0076] The indication information regarding the mapping of the reference signal may be received based on the method described in the third embodiment below.

[0077] The instruction information regarding the mapping of the reference signal may be information regarding the reference signal described in the second embodiment below.

[0078] The UE may determine / decide on the mapping of the reference signal based on whether a certain condition is met when transmitting an UL channel (e.g., PUSCH) and / or when receiving a DL channel (e.g., PDSCH).

[0079] The specific condition may be determined based on a specific rule, or may be determined based on information received according to a method described in the third embodiment below.

[0080] The UE may at least one of determine the mapping of reference signals to be applied and determine whether to apply information about the received reference signals based on whether certain conditions are met when transmitting an UL channel (e.g., PUSCH) and / or when receiving a DL channel (e.g., PDSCH).

[0081] For example, the UE may determine to apply a specific reference signal configuration when a specific condition is met, or may determine to apply information about a received reference signal when a specific condition is met.

[0082] On the other hand, if a specific condition is not satisfied, the UE may apply the reference signal configuration based on a specific method. The specific method may be a reference signal configuration method specified in an existing specification (e.g., Rel. 15 / 16). The specific method may also be the default configuration in Option 1-1 above. The specific method may also be the (default) configuration to which the change (instruction) in Option 1-2 above is not applied.

[0083] The specific condition may be at least one of the following conditions: Whether reference signal bundling (e.g. DMRS bundling) is applied. Whether or not at least one of transmission of an UL channel (for example, PUSCH) and reception of a DL channel (for example, PDSCH) is performed across multiple time resources (for example, slots). Whether the configured resource (e.g., RE) for receiving CSI-RS overlaps with the mapping resource of the reference signal based on the received information. Modulation order (for UL / DL channels). Number of layers (for UL / DL channels). Number of DMRS ports (for UL / DL channels). DCI format to allocate (schedule / activate) UL channel (e.g. PUSCH) / DL channel (e.g. PDSCH). · Whether it is a specific UL channel / DL channel. · RNTI (Radio Network Temporary Identifier) ​​that scrambles the CRC (Cyclic Redundancy Check) of the DCI that schedules / activates the UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH). -By configured grant configuration index (CofiguredGrantConfigIndex). ·Whether or not the DCI that allocates (schedules / activates) the UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH) includes information about the reference signal. The state of the UE corresponding to the training state or the state after training. ·UE speed / UE speed direction.

[0084] By making a decision based on whether DMRS bundling is applied, DMRS bundling enhances / improves channel estimation accuracy, making it possible to maintain estimation accuracy even if the number of DMRS symbols is reduced.

[0085] In this disclosure, "DMRS bundling" may mean transmitting (e.g., one) DMRS with equal power and maintaining phase continuity in multiple time resources (e.g., slots). In this disclosure, DMRS bundling, cross-slot channel estimation, cross-repetition channel estimation, and using a common DMRS in multiple time resources may be interchangeable.

[0086] An UL channel / DL channel spanning multiple time resources (e.g., slots) may be, for example, repetition transmission and / or transport block (TB) processing over multi-slots (TBoMS).

[0087] The overlap between the configured resources (for example, REs) for receiving CSI-RS and the mapping resources for reference signals based on received information will be described in detail in the fifth embodiment below.

[0088] A specific DCI format (e.g., DCI format 0_0 / 1_0) for which a UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH) is allocated (scheduled / activated) may be configured not to include information related to reference signals (information related to mapping of reference signals). This allows a configuration in which dynamic mapping of reference signals is not applied to the specific DCI format.

[0089] The specific UL channel / DL channel may be, for example, at least one of a PUSCH of a message A (e.g., message A) for a random access procedure of a specific type (e.g., type 2), a configured grant (type 1 / 2) PUSCH, a semi-persistent scheduling (SPS) PDSCH, and a PUSCH / PDSCH scheduled / activated by DCI.

[0090] The RNTI may be, for example, at least one of a Cell (C-) RNTI, a Configured Scheduling (CS-) RNTI, a Modulcation Coding Scheme Cell (MCS-C-) RNTI, and any other RNTI.

[0091] When applying information regarding a reference signal corresponding to each configured grant setting index (ConfiguredGrantConfigIndex), the DCI / MAC CE including information regarding the reference signal may include the index of the configured grant to be applied (ConfiguredGrantSetIndex).

[0092] A case where information on a reference signal is included in DCI that allocates (schedules / activates) an UL channel (for example, PUSCH) / DL channel (for example, PDSCH) will be described in detail in the fourth embodiment below.

[0093] The speed / direction of the UE may be determined based on whether the UE is identified as belonging to a specific moving body (e.g., a car, a train, etc.) The speed / direction of the UE / identification may be determined by the UE (e.g., based on a sensor possessed by the UE) or may be determined based on information regarding the speed / direction of the UE / identification transmitted from the base station.

[0094] The specific condition may be a condition that combines at least two of the multiple examples of the specific condition described above.

[0095] For example, the UE may apply information about the reference signal included in the DCI / MAC CE if certain conditions are met.

[0096] Furthermore, if certain conditions are met, the UE may change / update some / all of the settings of one reference signal configuration based on information about the reference signal included in the DCI / MAC CE.

[0097] Fig. 3 is a diagram illustrating an example of a condition related to a reference signal according to the first embodiment. In the example illustrated in Fig. 3, the UE makes a determination based on whether DMRS bundling is applied.

[0098] In Figure 3, if the UE determines that DMRS bundling is applied, it determines whether multiple slots of PUSCH transmission opportunities are configured / instructed for the 1TB allocation. If the UE determines that DMRS bundling is not applied, it determines that DMRS configuration A is applied.

[0099] In Fig. 3, if the UE determines that multiple slots of PUSCH transmission opportunities are configured / instructed for the 1TB allocation, it determines to apply DMRS configuration B. If the UE determines that multiple slots of PUSCH transmission opportunities are not configured / instructed for the 1TB allocation, it determines to apply DMRS configuration A.

[0100] Note that these DMRS settings A and B are merely examples, and the setting names and the number of settings are not limited to these.

[0101] According to the first embodiment described above, it is possible to appropriately select / determine / change / update the mapping of reference signals.

[0102] <Second embodiment> In the second embodiment, information related to the reference signal will be described.

[0103] The UE may receive information about the reference signal from the base station (network).

[0104] The information about the reference signal may include an index of the reference signal configuration to be applied to the mapping of the reference signal.

[0105] The index of the reference signal configuration to be applied to the mapping of the reference signal may be an index indicating one reference signal configuration to be applied from among a plurality of configured reference signal configurations.

[0106] If the UE does not receive information about a reference signal including an index of the reference signal configuration, the UE may apply a default reference signal configuration, which may be determined by a specific rule or based on the configuration of RRC signaling.

[0107] The information about the reference signal may include parameters for setting the reference signal, which may be at least one of the following parameters: · Type of reference signal (e.g. DMRS) configuration. · Number of Code Division Multiplexing (CDM) groups (not used for data). Number of additional DMRS symbols. Maximum number of OFDM symbols for front loaded DMRS. · Frequency resources (e.g., subcarriers) on which to transmit the reference signal. The symbol position of the first DMRS (e.g., start DMRS) for a particular mapping type (e.g., mapping type A). · PTRS frequency density / time density. · The frequency (e.g. subcarrier) offset of the PTRS. Energy per resource element (EPRE) ratio between PTRS and DL channel (e.g., PDSCH). PTRS transmit power boosting factor. Number of DMRS combs at RE level (per RE) / Resource Block (RB) level (per RB). The number of samples / sampling interval / sampling offset when sampling the reference signal symbol. - Number of samples / sampling interval / sampling offset when sampling the reference signal subcarrier. Number of samples / sampling interval / sampling offset and associated index.

[0108] The sampling offset may be an offset value for determining the symbol at which sampling starts, or may be an offset value for determining the subcarrier at which sampling starts.

[0109] In the present disclosure, sampling a reference signal may also mean determining / changing the symbols / subcarriers to which / where the reference signal is mapped.

[0110] 4A and 4B are diagrams showing an example of sampling of a reference signal. Fig. 4A shows a case where the sampling interval is 2 and the sampling offset is 0. Fig. 4B shows a case where the sampling interval is 2 and the sampling offset is 1.

[0111] In the examples shown in FIGS. 4A and 4B, the UE determines the symbols of the DMRS based on the indicated sampling interval and offset.

[0112] The information about the reference signal may include information about time resources to which the reference signal is not mapped. The information about time resources to which the reference signal is not mapped may be determined according to at least one of the following options 2-1-1 to 2-1-3.

[0113] Option 2-1-1 The information regarding the time resource to which the reference signal is not mapped may be information indicating the symbol to which the reference signal is not mapped.

[0114] The information indicating the symbols to which the reference signal is not mapped may be a bitmap.

[0115] The UE may determine the symbols to which the reference signals are not mapped based on information (bitmap) indicating the symbols to which the reference signals are not mapped.

[0116] The UE may assume (expect) / determine that a reference signal is not mapped in an (OFDM) symbol where the value of the indicated bitmap corresponds to a bit of a first value (e.g., 1 (or 0)).

[0117] Each bit (value) of the bitmap may correspond to one or more symbols. Each bit (value) of the bitmap may correspond to X symbols (X is an integer greater than or equal to 1). X may be specified in advance in a specification, may be determined based on a specific rule, may be set by RRC signaling, or may be determined based on reported UE capability information.

[0118] The length (bit length) of the bitmap may be specified in advance in a specification, may be determined based on a specific rule, may be set by RRC signaling, or may be determined based on a report of UE capability information.

[0119] The length of the bitmap may be determined based on the number of symbols of the reference signal in N slots (N is an integer, e.g., N=1) / repetition. For example, the length of the bitmap may be the number of symbols of the reference signal in N slots / repetition.

[0120] The length of the bitmap may be determined based on the number of symbols of the additional reference signal (e.g., additional DMRS) plus M (M is an integer, e.g., M=1). For example, the length of the bitmap may be the number of symbols of the additional reference signal (e.g., additional DMRS) plus M.

[0121] The length of the bitmap may be determined based on the number of allocated symbols of the UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH). For example, the length of the bitmap may be the number of allocated symbols of the UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH).

[0122] When repeated transmission / TBoMS is applied to an UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH), the length of the bitmap may be determined based on a value obtained by multiplying at least one of the number of reference signal symbols in N slots / repeated transmission, the number of additional reference signal symbols plus M, and the number of allocated symbols of the UL channel / DL channel by the number of repetitions / number of allocated slots. For example, when repeated transmission / TBoMS is applied to an UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH), the length of the bitmap may be a value obtained by multiplying at least one of the number of reference signal symbols in N slots / repeated transmission, the number of additional reference signal symbols plus M, and the number of allocated symbols of the UL channel / DL channel by the number of repetitions / number of allocated slots.

[0123] When repeated transmission / TBoMS is applied to an UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH), the length of the bitmap may be determined based on at least one of the number of reference signal symbols in N slots / repeated transmission in each slot, the number of additional reference signal symbols plus M, and the number of allocated symbols for the UL channel / DL channel. For example, when repeated transmission / TBoMS is applied to an UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH), the length of the bitmap may be at least one of the number of reference signal symbols in N slots / repeated transmission in each slot, the number of additional reference signal symbols plus M, and the number of allocated symbols for the UL channel / DL channel.

[0124] The length of the bitmap may be determined based on the number of repetitions in the allocatable slots based on the RRC parameters. For example, the length of the bitmap may be the number of repetitions in the allocatable slots based on the RRC parameters.

[0125] When each bit (value) of the bitmap corresponds to a plurality (X) of symbols, the length of the bitmap may be determined based on a value obtained by multiplying at least one of the number of reference signal symbols in N slots / repeated transmission, the number of additional reference signal symbols plus M, and the number of assigned symbols of the UL channel / DL channel by 1 / X and rounding up the result. For example, when each bit (value) of the bitmap corresponds to a plurality (X) of symbols, the length of the bitmap may be a value obtained by multiplying at least one of the number of reference signal symbols in N slots / repeated transmission, the number of additional reference signal symbols plus M, and the number of assigned symbols of the UL channel / DL channel by 1 / X and rounding up the result.

[0126] The UE may receive an index associated with the bitmap based on RRC signaling / specific rules using DCI / MAC CE.

[0127] 5A and 5B are diagrams showing an example of mapping of reference signals according to the second embodiment.

[0128] In the example shown in Fig. 5A, a bitmap with a bit length equal to the number of symbols of the reference signal (DMRS) in one slot is instructed to the UE. In the example shown in Fig. 5A, the number of repeated transmissions is 2, and the number of symbols (above X) corresponding to each bit of the bitmap is 2.

[0129] As shown in FIG. 5A, when a bitmap of "0110" is instructed to the UE, the UE determines that a DMRS is mapped to an OFDM symbol for DMRS corresponding to 0, and that a DMRS is not mapped to an OFDM symbol for DMRS corresponding to 1.

[0130] In the example shown in Fig. 5B, the bitmap instructed to the UE indicates a case applied to each slot. In the example shown in Fig. 5B, as in Fig. 5A, the number of repeated transmissions is 2, and the number of symbols (X above) corresponding to each bit of the bitmap is 2.

[0131] As shown in Figure 5B, similar to Figure 5A, when a bitmap of "01" is instructed to the UE, the UE determines that in each slot, DMRS is mapped to the OFDM symbol for DMRS corresponding to 0, and DMRS is not mapped to the OFDM symbol for DMRS corresponding to 1.

[0132] Option 2-1-2 The information regarding the time resource to which the reference signal is not mapped may be information indicating a slot to which the reference signal is not mapped.

[0133] The information indicating the slots to which the reference signal is not mapped may be a bitmap.

[0134] The UE may determine slots to which reference signals are not mapped based on information (bitmap) indicating slots to which reference signals are not mapped.

[0135] The UE may assume (expect) / determine that no reference signal is mapped in a slot where the value of the indicated bitmap corresponds to a bit with a first value (e.g., 1 (or 0)).

[0136] Each bit (value) of the bitmap may correspond to one or more slots. Each bit (value) of the bitmap may correspond to X slots (X is an integer greater than or equal to 1). X may be specified in advance in a specification, may be determined based on a specific rule, may be set by RRC signaling, or may be determined based on reported UE capability information.

[0137] The length (bit length) of the bitmap may be specified in advance in a specification, may be determined based on a specific rule, may be set by RRC signaling, or may be determined based on a report of UE capability information.

[0138] The length of the bitmap may be determined based on the number of repetitions when repeated transmission is applied to the UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH). For example, the length of the bitmap may be the number of repetitions when repeated transmission is applied to the UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH).

[0139] The length of the bitmap may be determined based on the number of allocated slots when TBoMS is applied to an UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH). For example, the length of the bitmap may be the number of allocated slots when TBoMS is applied to an UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH).

[0140] The length of the bitmap may be determined based on the number of repetitions in the allocatable slots based on the RRC parameters. For example, the length of the bitmap may be the number of repetitions in the allocatable slots based on the RRC parameters.

[0141] The length of the bitmap may be determined based on the maximum number of repetitions / number of allocated slots set by RRC signaling. For example, the length of the bitmap may be the maximum number of repetitions / number of allocated slots set by RRC signaling. In this case, the length of the bitmap can be determined independently of the content of the DCI.

[0142] When each bit (value) of the bitmap corresponds to a plurality (X) of slots, the length of the bitmap may be determined based on a value obtained by multiplying at least one of the number of repetitions, the number of assigned slots, the number of repetitions in assignable slots based on RRC parameters, and the maximum number of repetitions / number of assigned slots set by RRC signaling by 1 / X and rounding up the result. For example, when each bit (value) of the bitmap corresponds to a plurality (X) of symbols, the length of the bitmap may be a value obtained by multiplying at least one of the number of repetitions, the number of assigned slots, the number of repetitions in assignable slots based on RRC parameters, and the maximum number of repetitions / number of assigned slots set by RRC signaling by 1 / X and rounding up the result.

[0143] The UE may receive an index associated with the bitmap based on RRC signaling / specific rules using DCI / MAC CE.

[0144] FIG. 6 is a diagram showing another example of mapping of reference signals according to the second embodiment.

[0145] In the example shown in FIG. 6, the number of repeated transmissions is 4, and the number of slots (X above) corresponding to each bit of the bitmap is 2.

[0146] As shown in Fig. 6, when "01" is instructed as a bitmap to a UE, the UE determines that a DMRS is mapped to a slot corresponding to 0, and that a DMRS is not mapped to a slot corresponding to 1. In the example of Fig. 6, a DMRS is mapped to the first two slots, and a DMRS is not mapped to the following two slots.

[0147] 《Option 2-1-3》 The above options 2-1-1 and 2-1-2 may be applied in combination.

[0148] According to the above options 2-1-1 to 2-1-3, it becomes possible to appropriately determine the time resource for transmitting the reference signal.

[0149] The information about the reference signal may include information about frequency resources to which the reference signal is not mapped.

[0150] The information regarding frequency resources to which reference signals are not mapped may be information indicating subcarriers to which reference signals are not mapped.

[0151] Information about frequency resources (eg, subcarriers) to which reference signals are not mapped may be determined according to at least one of the following options 2-2-1 to 2-2-3.

[0152] Option 2-2-1 The information regarding subcarriers to which reference signals are not mapped may be information based on information that specifies (limits) the values ​​of sequences corresponding to frequency resources of the reference signals.

[0153] The sequence is an Orthogonal Cover Code (OCC) sequence (e.g., w f (k') and w t (k') or (k').

[0154] The value of the sequence (eg, the value designated (defined) as k') may be a first value (eg, "0") or a second value (eg, "1").

[0155] When the value of the sequence (k') is limited to one value (first value or second value), the UE may determine the mapping of the reference signal based on a mathematical formula for the reference signal sequence given in Equation 1 below.

[0156]

number

[0157] Here, α in the above formula 1 k,l (p,μ) is the complex value of RE(k,l) corresponding to antenna port p and subcarrier spacing setting μ. PDSCH DMRS is the scaling factor of the reference signal, and w f is the OCC sequence in the frequency domain, and w t is the OCC sequence in the time direction, r is the reference signal sequence, k is the subcarrier index, l is the symbol index, and Δ is the offset value.

[0158] The above formula 1 differs from the formulas defined in the existing specifications (up to Rel. 16) in that the only variable of the sequence r is n. By using the above formula 1 for mapping the reference signal, the sequence values ​​can be used as continuous values ​​even when k' is limited.

[0159] When the value of the sequence (k') is limited to one value (first value or second value), the UE may determine the mapping of the reference signal based on a mathematical formula for the reference signal sequence given in Equation 2 below.

[0160]

number

[0161] The above equation 2 is the same as the equation for mapping of reference signals (DMRS of PDSCH) defined in existing specifications (up to Rel. 16). Each parameter in equation 2 is the same as in equation 1.

[0162] The above formulas 1 and 2 may be applied not only to DL channels (e.g., PDSCH) but also to UL channels (e.g., PUSCH) as appropriate. For example, when applying the above formulas 1 and 2 to PUSCH, the parameters for PDSCH may be appropriately changed and applied to PUSCH.

[0163] If the possible values ​​of the sequence (k') differ between UEs, the UEs may assume that the reference signal is not multiplexed between UEs.

[0164] The UE may determine the possible values ​​of the sequence (k') based on the DMRS port.

[0165] 7A and 7B are diagrams illustrating an example of mapping of a reference signal according to Option 2-2-1 of the second embodiment. When a UE receives information based on information that specifies (limits) the value of a sequence corresponding to a frequency resource of a reference signal, the UE performs mapping of the reference signal as shown in FIGS. 7A and 7B.

[0166] For example, the reference signal mapping shown in Fig. 7A corresponds to the case of configuration type 1 and offset (Δ) = 0 in the above equation 1. The UE determines the reference signal mapping corresponding to each of the cases where the value of k' is limited to 0 and the value of k' is limited to 1.

[0167] For example, the reference signal mapping shown in Figure 7B corresponds to the case of configuration type 2 and offset (Δ) = 0 in the above equation 2. The UE determines the reference signal mapping corresponding to each of the cases where the value of k' is limited to 0 and the value of k' is limited to 1.

[0168] Option 2-2-2 The information regarding frequency resources to which reference signals are not mapped may be information indicating subcarriers to which / to which reference signals are not mapped.

[0169] The information indicating the subcarriers to which the reference signals are mapped / not mapped may be a bitmap.

[0170] The UE may determine the subcarriers to which the reference signals are mapped or not mapped based on information (bitmap) indicating the subcarriers to which the reference signals are mapped or not mapped.

[0171] The UE may assume (expect) / determine that a reference signal is not mapped to a subcarrier whose indicated bitmap value corresponds to a bit having a first value (e.g., 0 (or 1)).

[0172] Each bit (value) of the bitmap may correspond to one or more subcarriers. Each bit (value) of the bitmap may correspond to X subcarriers (X is an integer greater than or equal to 1). X may be specified in advance in a specification, may be determined based on a specific rule, may be set by RRC signaling, or may be determined based on reported UE capability information.

[0173] Each bit (value) of the bitmap may correspond to the variable n in at least one of the above equations 1 and 2.

[0174] The length of the bitmap may be specified in advance, may be determined based on a specific rule, may be set by RRC signaling, or may be determined based on the report of UE capability information.

[0175] For example, the length of the bitmap may be determined based on the maximum number of subcarriers of reference signals that can be mapped in Y RBs / REs (Y is an integer equal to or greater than 1). For example, the length of the bitmap may be determined based on the maximum number of subcarriers of reference signals that can be mapped in Y RBs / REs (Y is an integer equal to or greater than 1). Furthermore, for example, the length of the bitmap may be the maximum number of subcarriers of reference signals that can be mapped in Y RBs / REs. Y may be specified in advance in a specification, may be determined based on a specific rule, may be set by RRC signaling, or may be determined based on reported UE capability information.

[0176] When each bit (value) of the bitmap corresponds to a plurality (X) of subcarriers, the length of the bitmap may be determined based on the number of allocated subcarriers and at least one of the maximum number of reference signal subcarriers that can be mapped in Y (Y is an integer equal to or greater than 1) RB / RE, a number that is predefined in the specifications, a number that is determined based on a specific rule, a number that is configured by RRC signaling, and a number that is based on a UE capability information report, multiplied by 1 / X and rounded up. For example, when each bit (value) of the bitmap corresponds to a plurality (X) of symbols, the length of the bitmap may be determined based on the number of allocated subcarriers and at least one of the maximum number of reference signal subcarriers that can be mapped in Y (Y is an integer equal to or greater than 1) RB / RE, a number that is predefined in the specifications, a number that is determined based on a specific rule, a number that is configured by RRC signaling, and a number that is based on a UE capability information report, multiplied by 1 / X and rounded up.

[0177] The UE may receive an index associated with the bitmap based on RRC signaling / specific rules using DCI / MAC CE.

[0178] Fig. 8 is a diagram illustrating an example of mapping of reference signals according to option 2-2-2 of the second embodiment. Fig. 8 illustrates a case where the length of the bitmap is the number of subcarriers (here, 6) of the reference signals mapped to 1 RB (12 subcarriers).

[0179] 8 shows an example in which the bitmap value "101010" or "010001" is notified to the UE. The UE determines that the reference signal is mapped to the subcarriers corresponding to "1" and that the reference signal is not mapped to the subcarriers corresponding to "0".

[0180] In the example shown in FIG. 8, the most significant bit (MSB) of the bitmap corresponds to the lowest subcarrier, but the least significant bit (LSB) of the bitmap may also correspond to the lowest subcarrier.

[0181] Option 2-2-3 The above options 2-2-1 and 2-2-2 may be applied in combination.

[0182] According to the above options 2-2-1 to 2-2-3, it becomes possible to appropriately determine the frequency resource on which the reference signal is transmitted.

[0183] The UE may determine a sequence (eg, an OCC sequence) in the frequency direction (frequency domain) for mapping the reference signal.

[0184] The UE may determine the frequency domain sequence for mapping the reference signal based on at least one of the following options 2-3-1 and 2-3-2.

[0185] The UE may decide whether to apply Option 2-3-1 / 2-3-2, or whether to apply either Option 2-3-1 or 2-3-2, according to a specific rule, may be configured by RRC signaling, or may decide based on information regarding the reference signal included in the DCI / MAC CE.

[0186] When applying option 2-3-1 / 2-3-2, the UE may assume that reference signals will not be multiplexed between UEs that do not apply option 2-3-1 / 2-3-2 (the same option) and / or that apply an option different from the option applied by the UE.

[0187] Option 2-3-1 The UE calculates the value of a sequence in the frequency direction (for example, an OCC sequence) (for example, w f (the value of k') may be assumed / determined to be a fixed value.

[0188] For example, the fixed value may be 1 (or may be −1).

[0189] In Option 2-3-1, for a first configuration type (e.g., configuration type 1), the number of applicable DMRS ports may be limited to a specific value (e.g., only 1000 or 1001 (offset (Δ) is 0 or 1, respectively)). Also, different reference signal (e.g., DMRS) ports may be configured based on the value of k'.

[0190] In option 2-3-1, for a second configuration type (e.g., configuration type 2), the number of applicable DMRS ports may be limited to a specific value (e.g., only 1000, 1001, or 1002 (offset (Δ) is 0, 2, or 4, respectively)). The CDM groups at ports 1000, 1001, and 1002 may be 0, 1, and 2, respectively. Also, different reference signal (e.g., DMRS) ports may be configured based on the value of k'.

[0191] Option 2-3-2 The UE may calculate a frequency domain sequence (e.g., an OCC sequence) based on a specific number (e.g., N (N is an integer greater than or equal to 1)) of specific sequences and apply it to each of the specific number of subcarriers to which the reference signal is mapped.

[0192] The particular sequence may be, for example, a cyclic shift sequence.

[0193] The UE may determine a sequence in the frequency direction for each reference signal (DMRS) port based on N cyclic shift sequences with a sequence length of N, which are shifted by a phase rotation amount of 2π / N.

[0194] The N may be specified in advance in a specification, may be determined based on a specific rule, may be set by RRC signaling, or may be determined based on information regarding reference signals included in DCI / MAC CE.

[0195] Option 2-3-2 is suitable for use when a reference signal is mapped to N subcarriers, and multiplexing for N UEs (inter-UE multiplexing) is possible using only a frequency domain sequence (OCC).

[0196] 9A and 9B are diagrams showing an example of determining a sequence according to option 2-3-2 of the second embodiment. The examples shown in Fig. 9A and 9B show a case where N is 3.

[0197] For example, the UE may determine the OCC sequence in the frequency domain for each reference signal (DMRS) port based on three cyclic shift sequences (see FIG. 9A) with a sequence length of 3, each of which has a phase rotation amount shifted by 2π / 3. This method is suitable for use when a reference signal is assigned to each of the subcarriers whose number is calculated by dividing the total number of assigned subcarriers by 3.

[0198] As shown in Figure 9B, the UE may apply an OCC sequence to every fourth subcarrier within the entire RB, or to every third subcarrier among the subcarriers to which the DMRS is mapped.

[0199] According to the second embodiment described above, it is possible to appropriately define / determine information about reference signals for determining mapping of reference signals.

[0200] <Third embodiment> In the third embodiment, a method for notifying / receiving / transmitting information related to a reference signal will be described.

[0201] The UE may receive information about the reference signal using higher layer signaling (RRC signaling / MAC CE) / physical layer signaling (DCI).

[0202] The UE may receive one or more reference signal configurations using RRC signaling.

[0203] One or more (or a plurality of) reference signal configurations (for example, reference signal configurations X and Y in the above first embodiment) may be configured for the UE. One or more (or a plurality of) resource mappings of reference signals may be configured for the UE.

[0204] A condition as to which reference signal to apply from among a plurality of reference signal configurations may be configured for the UE using RRC signaling.

[0205] The mapping of the reference signal may be associated with a Time Domain Resource Assignment (TDRA) of an UL channel (eg, PUSCH) / DL channel (eg, PDSCH).

[0206] For example, each row index of the TDRA may be associated with a mapping configuration of each reference signal. The UE may determine to apply the reference signal configuration corresponding to the row index indicated by the DCI when scheduling an UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH).

[0207] The UE may receive at least one of the pieces of information relating to the reference signal in the second embodiment by using RRC signaling.

[0208] The UE may receive an indication regarding one or more reference signal configurations using the MAC CE.

[0209] For example, the UE may be instructed, using MAC CE, which reference signal configuration to apply from among multiple reference signal configurations configured using RRC signaling.

[0210] The UE may receive at least one of the pieces of information relating to the reference signal in the second embodiment using MAC CE.

[0211] The UE may receive information about the reference signal using DCI.

[0212] The DCI may be DCI transmitted individually to a UE. In other words, the DCI may be DCI transmitted in a UE-specific control resource set (CORESET) / PDCCH / search space set. The RNTI used to scramble the CRC of the DCI may be a specific RNTI (e.g., C-RNTI / CS-RNTI / MCS-C-RNTI).

[0213] By treating the DCI as a DCI for each UE, it is possible to report to the base station (network) whether each UE has been able to decode the DCI.

[0214] The DCI may be a DCI that schedules / activates an UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH).

[0215] Furthermore, the DCI may be DCI transmitted in common to multiple UEs (groupcast / multicast DCI). In other words, the DCI may be DCI transmitted in a control resource set (CORESET) / PDCCH / search space set common to multiple UEs. By making the DCI common to multiple UEs, for example, when the degree of learning differs for each band (for each BWP, for each subband, for each cell), it becomes possible to collectively change / instruct multiple UEs using the same band.

[0216] The RNTI used to scramble the CRC of the DCI (DCI common to multiple UEs) may be an existing RNTI (e.g., C-RNTI / CS-RNTI / MCS-C-RNTI) or another (newly defined) RNTI.

[0217] The UE may determine the discrimination information for the RNTI to be used based on a specific rule, may determine it based on settings made by RRC signaling, or may determine it based on information about the reference signal received using DCI / MAC CE.

[0218] The UE may be configured with a PDCCH / CORESET / search space for receiving the DCI.

[0219] The UE may report / transmit HARQ-ACK information for the DCI.

[0220] The UE may report HARQ-ACK information regarding the decoding of the received DCI a specific number (e.g., N (N is an integer equal to or greater than 1)) of symbols / slots / ms after the last symbol of the PDCCH corresponding to the DCI. N may be determined based on a specific rule, a setting by RRC signaling, a report of UE capability information, or a numerology setting (e.g., subcarrier spacing) based on the received DCI.

[0221] When a UE receives information about a reference signal using DCI common to multiple UEs, the UE may transmit HARQ-ACK (NACK) information only when transmitting an ACK (or NACK).

[0222] When a UE receives information related to a reference signal using DCI common to multiple UEs, the UE may transmit / report information for identifying the UE (for example, C-RNTI) in addition to HARQ-ACK information.

[0223] The UE may be instructed, using DCI, to select one reference signal configuration from among multiple reference signal configurations configured using RRC signaling / MAC CE.

[0224] The UE may receive at least one of the pieces of information relating to the reference signal in the second embodiment using DCI.

[0225] According to the third embodiment described above, it becomes possible to appropriately notify / transmit / receive information related to the reference signal.

[0226] <Fourth embodiment> The fourth embodiment describes a period in which information about a reference signal is applied.

[0227] The UE may determine the period for which information regarding the reference signal is to be applied according to at least one of options 4-1 to 4-3 below.

[0228] Option 4-1 When DCI for scheduling / activating an UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH) includes information about a reference signal, the information about the reference signal (or a change in the settings based on the information about the reference signal) may be applied to the UL channel / DL channel scheduled / activated by the DCI.

[0229] The UL channel / DL channel may include at least one of an SPS PDSCH, a configured grant (CG) PUSCH (eg, a PUSCH of CG type 2), and repeated transmission of a PUSCH / PDSCH.

[0230] When the UL channel / DL channel is scheduled / activated by the DCI, the UE may apply information about the reference signal included in the DCI to all of the UL channel / DL channel.

[0231] When the UL channel / DL channel is scheduled / activated by the DCI, the UE may apply information about the reference signal included in the DCI to the UL channel / DL channel for a specific number of transmission / reception opportunities (e.g., N) from the first transmission / reception opportunity, where N may be determined based on a specific rule, a setting by RRC signaling, or a report of UE capability information.

[0232] When the UL channel / DL channel is scheduled / activated by the DCI, the UE may apply information about the reference signal included in the DCI to the UL channel / DL channel at the first transmission / reception opportunity among the UL channel / DL channel.

[0233] 10A and 10B are diagrams illustrating an example of application of information related to reference signals according to Option 4-1 of the fourth embodiment. In FIG. 10A and FIG. 10B, a UE receives DCI for activating a CG PUSCH. The DCI includes, as information related to reference signals, information instructing the addition of one additional DMRS.

[0234] In the example shown in FIG. 10A, the UE applies information about the reference signal included in the DCI to (all) CG PUSCHs activated by the DCI.

[0235] In the example shown in Fig. 10B, the UE applies information about reference signals included in the DCI to the CG PUSCH at the first transmission opportunity among the CG PUSCHs activated by the DCI, while the UE does not apply information about reference signals included in the DCI to CG PUSCHs other than the CG PUSCH at the first transmission opportunity.

[0236] Option 4-2 Option 4-2 mainly describes the timing for applying information about the reference signal (starting to apply information about the reference signal).

[0237] The UE may determine / decide when to start applying information about the reference signal according to at least one of options 4-2-1 to 4-2-3 below.

[0238] [Option 4-2-1] The UE may start applying the information about the reference signal (including DCI / MAC CE) in a time resource (symbol / slot / subslot) a certain number (e.g., N) of time resources (symbols / slots / subslots / ms) after receiving the information about the reference signal.

[0239] [Option 4-2-2] The UE may start applying the information about the reference signal in a time resource (symbol / slot / subslot) a certain number (e.g., N) of time resources (symbols / slots / subslots / ms) after the transmission of an UL channel (e.g., PUCCH / PUSCH) including HARQ-ACK information corresponding to the information about the reference signal (DCI / MAC CE including the information).

[0240] [Option 4-2-3] If the DCI that schedules / activates an UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH) includes information about a reference signal, the UE may start applying the information about the reference signal in a specific (e.g., first) time resource (symbol / slot / subslot) of the UL channel / DL channel scheduled / activated by the DCI.

[0241] N in the above options 4-2-1 to 4-2-3 may be a value equal to or greater than 0. N in the above options 4-2-1 to 4-2-3 may be specified in advance in a specification, may be determined according to a specific rule, may be set using RRC signaling, may be determined based on UE capability information, may be determined based on information related to reference signals included in DCI / MAC CE, or may be determined for each numerology (e.g., subcarrier spacing setting) based on the received DCI / MAC CE.

[0242] Whether any of the above options 4-2-1 to 4-2-3 is applied may be specified in advance in a specification, may be determined by a specific rule, may be set using RRC signaling, may be determined based on UE capability information, or may be determined based on information about reference signals included in DCI / MAC CE.

[0243] Regarding Option 4-2, whether to apply it to a specific UL channel / DL channel may be determined by a specific rule, may be configured using RRC signaling, may be determined based on UE capability information, or may be determined based on information on reference signals included in DCI / MAC CE. The specific UL channel / DL channel may be, for example, at least one of a PUSCH carrying message A, a CG (Type 1 / 2) PUSCH, an SPS PDSCH, and a PUSCH / PDSCH scheduled / activated by DCI.

[0244] 11A and 11B are diagrams illustrating an example of application of information related to reference signals according to option 4-2 of the fourth embodiment. In Fig. 11A, application of the information related to reference signals starts N slots after the final symbol of reception of DCI / MAC CE including the information related to reference signals (the above-mentioned option 4-2-1). Also, in Fig. 11B, application of the information related to reference signals starts N slots after transmission of HARQ-ACK information corresponding to the information related to reference signals (the above-mentioned option 4-2-2).

[0245] Option 4-3 Option 4-3 mainly explains the timing to end the application of information about the reference signal.

[0246] The UE may determine / decide when to terminate application of information related to the reference signal according to at least one of options 4-3-1 to 4-3-9 below.

[0247] [Option 4-3-1] The UE may terminate application of information related to the reference signal in a time resource (symbol / slot / subslot) a certain number (e.g., M) of time resources (symbols / slots / subslots / ms) after the transmission of HARQ-ACK information corresponding to the RRC reconfiguration message (including the PDSCH).

[0248] [Option 4-3-2] The UE may stop applying information related to the reference signal in the time resource (symbol / slot / subslot) after entering the RRC inactive mode / RRC idle mode.

[0249] [Option 4-3-3] The UE may stop applying the information about the previous reference signal in a time resource (symbol / slot / subslot) a certain number (e.g., M) of time resources (symbols / slots / subslots / ms) after receiving information about a new reference signal (including DCI / MAC CE).

[0250] [Option 4-3-4] The UE may terminate application of the previous information related to the reference signal at the timing when application (starts) of information related to the new reference signal (including DCI / MAC CE).

[0251] The timing for applying (starting) the information about the new reference signal may be at least one of the timings described in Option 4-2 above.

[0252] [Option 4-3-5] The UE may stop applying the information about the reference signal (including DCI / MAC CE) in a time resource (symbol / slot / subslot) a certain number (e.g., M) of time resources (symbols / slots / subslots / ms) after receiving the information about the reference signal.

[0253] [Option 4-3-6] The UE may terminate application of the information regarding the reference signal in a time resource (symbol / slot / subslot) a certain number (e.g., M) of time resources (symbols / slots / subslots / ms) after transmission of an UL channel (e.g., PUCCH / PUSCH) including HARQ-ACK information corresponding to the information regarding the reference signal (DCI / MAC CE including the information).

[0254] [Option 4-3-7] If the DCI that schedules / activates an UL channel (e.g., PUSCH) / DL channel (e.g., PDSCH) includes information about a reference signal, the UE may stop applying the information about the reference signal in a time resource (symbol / slot / subslot) a certain number (e.g., M) of time resources (symbols / slots / subslots / ms) after the time resource (symbol / slot / subslot) of a specific (e.g., last) UL channel / DL channel among the UL channels / DL channels scheduled / activated by the DCI.

[0255] [Option 4-3-8] If the DCI for scheduling / activating a DL channel (e.g., PDSCH) includes information about a reference signal, the UE may stop applying the information about the reference signal a certain number (e.g., M) of time resources (symbols / slots / subslots / ms) after the transmission of the UL channel (PUCCH / PUSCH) including HARQ-ACK information corresponding to the (last) DL channel to be scheduled / activated.

[0256] [Option 4-3-9] The UE may stop applying the information related to the reference signal in at least one of a specific number (e.g., M) of time resources (symbols / slots / subslots) after starting to apply the information related to the reference signal and L UL channel transmissions / DL channel receptions.

[0257] N and L in the above options 4-3-1 to 4-3-9 may be values ​​equal to or greater than 0. N and L in the above options 4-3-1 to 4-3-9 may be specified in advance in a specification, may be determined according to a specific rule, may be set using RRC signaling, may be determined based on UE capability information, may be determined based on information related to reference signals included in DCI / MAC CE, or may be determined for each numerology (e.g., subcarrier spacing setting) based on the received DCI / MAC CE.

[0258] Whether any of the above options 4-3-1 to 4-3-9 is applied may be specified in advance in a specification, may be determined by a specific rule, may be set using RRC signaling, may be determined based on UE capability information, or may be determined based on information regarding reference signals included in DCI / MAC CE.

[0259] Regarding Option 4-3, whether or not to apply to a specific UL channel / DL channel may be determined by a specific rule, may be configured using RRC signaling, may be determined based on UE capability information, or may be determined based on information on reference signals included in DCI / MAC CE. The specific UL channel / DL channel may be, for example, at least one of a PUSCH carrying message A, a CG (Type 1 / 2) PUSCH, an SPS PDSCH, and a PUSCH / PDSCH scheduled / activated by DCI.

[0260] According to the fourth embodiment, it is possible to appropriately determine the application period of the information related to the reference signal.

[0261] <Fifth embodiment> In the fifth embodiment, a case will be described in which a reference signal (first reference signal) overlaps with another reference signal (second reference signal) different from the first reference signal.

[0262] In this embodiment, the first reference signal may refer to the reference signal in the first to fourth and sixth to ninth embodiments. In this embodiment, the second reference signal may be, for example, a CSI-RS.

[0263] The UE may assume that the information (including DCI / MAC CE) regarding the first reference signal does not include an indication that the resources of the first reference signal indicated by the information overlap with the resources of the second reference signal.

[0264] The resource of the first reference signal may be, for example, at least one of a DMRS resource, a DMRS resource of a CDM group associated with a potential DMRS port of a PDSCH, and a PTRS resource.

[0265] The CDM group associated with the potential DMRS port may refer to a CDM group for a DMRS that is mapped to resources that are contiguous / discontiguous in the frequency direction to which the DMRS may be mapped.

[0266] If the information (including DCI / MAC CE) regarding the first reference signal includes an indication that the resources of the first reference signal indicated by the information overlap with the resources of the second reference signal, the UE may operate based on specific rules.

[0267] The particular rule may be at least one of options 5-1 to 5-3 below.

[0268] Option 5-1 The UE may apply information about the first reference signal.

[0269] The UE may not receive / decode (resources of) a second reference signal that overlaps (resources of) a first reference signal.

[0270] Option 5-2 The UE may not apply information about the first reference signal.

[0271] The UE may not apply all of the information about the first reference signal.

[0272] The UE may apply part of the information about the first reference signal and not apply the remaining part about the first reference signal.

[0273] Option 5-3 In applying the information about the first reference signal, the UE may apply the information by changing the resource to which the first reference signal is mapped so that the first reference signal does not overlap with the second reference signal.

[0274] For example, when applying information regarding a first reference signal, the UE may shift the resource onto which the first reference signal is mapped by a specific number of symbols so that the portion of the first reference signal that overlaps with the second reference signal does not overlap with the second reference signal.

[0275] Whether any of the above options 5-1 to 5-3 is applied may be specified in advance in a specification, may be determined by a specific rule, may be set using RRC signaling, or may be determined based on UE capability information.

[0276] The application of this embodiment may be limited to, for example, only option 1-2 (or 1-3) of the first embodiment described above.

[0277] Fig. 12 is a diagram illustrating an example of overlapping of reference signals according to the fifth embodiment. In Fig. 12, the UE receives an SPS PDSCH.

[0278] In the first and second reception opportunities of the SPS PDSCH, the first reference signal (DMRS of the PDSCH) and the second reference signal (CSI-RS) do not overlap.

[0279] In the example shown in FIG. 12, the UE receives information about the first reference signal and transmits an additional DMRS at the third reception opportunity.

[0280] In cases where the first reference signal and the second reference signal overlap due to instructions based on information about the first reference signal, as in the example shown in Figure 12, at least one of the above-mentioned options 5-2 and 5-3 may be applied.

[0281] According to the fifth embodiment described above, it is possible to define an appropriate operation for the case where the first reference signal and the second reference signal overlap.

[0282] Sixth Embodiment In the sixth embodiment, a PDSCH processing procedure time / PDSCH decoding time will be described.

[0283] In the present disclosure, the PDSCH processing procedure time may refer to the time (symbols) that elapses from the last symbol of the PDSCH until the transmission of the HARQ-ACK corresponding to the PDSCH.

[0284] The PDSCH processing procedure time may be determined based on the PDSCH decoding time. The PDSCH decoding time may be included in the PDSCH processing procedure time.

[0285] When the UE receives information about the reference signal, the UE may determine / judge the PDSCH processing procedure time / PDSCH decoding time based on at least one of options 6-1 and 6-2 below.

[0286] Option 6-1 Even if the UE receives information about the reference signal, the UE may determine / decide the PDSCH processing procedure time / PDSCH decoding time based on certain higher layer (RRC) parameters.

[0287] The specific higher layer (RRC) parameter may be information about an additional position of a DMRS (e.g., dmrs-AdditionnalPosition) included in a DL DMRS configuration (e.g., DMRS-downlinkConfig). The specific higher layer (RRC) parameter may be a parameter that is set before receiving information about a reference signal.

[0288] Option 6-2 The UE may determine / judge a PDSCH processing procedure time / PDSCH decoding time based on information about the reference signal.

[0289] The information about the reference signal may be information about the number of symbols of the additional reference signal (for example, the number of OFDM symbols of the additional DMRS).

[0290] A setting of PDSCH processing procedure time / PDSCH decoding time corresponding to the number of symbols of the additional reference signal may be defined.

[0291] Fig. 13 is a diagram showing an example of determining a PDSCH decoding time according to option 6-2 of embodiment 6. The UE determines / judges the PDSCH processing procedure time / PDSCH decoding time based on the correspondence relationship (for example, a table) shown in Fig. 13.

[0292] 13 shows a correspondence relationship based on whether the number of OFDM symbols of the additional DMRS is 0, whether the number of OFDM symbols of the additional DMRS is 1 or more, and the setting of the PDSCH subcarrier spacing (μ), but the conditions and time values ​​in the correspondence relationship are merely examples. For example, the number of OFDM symbols of the additional DMRS that is the condition may be any value, and the number of rows indicating the number of OFDM symbols of the additional DMRS that is the condition may be three or more.

[0293] Whether option 6-1 or 6-2 is applied may be specified in advance in a specification, may be determined by a specific rule, may be set using RRC signaling, or may be determined based on UE capability information.

[0294] According to the sixth embodiment described above, even when the settings related to the reference signal are dynamically changed based on the information related to the reference signal, it is possible to appropriately determine / judge the PDSCH processing procedure time / PDSCH decoding time.

[0295] Seventh Embodiment In the seventh embodiment, the bit width of information relating to a reference signal will be described.

[0296] At least one of the following options 7-1 and 7-2 may be applied to the bit field of the information related to the reference signal included in the MAC CE / DCI (format).

[0297] Option 7-1 The UE may not assume reception of DCI / MAC CE that includes information about a reference signal for which the bit width of the bit field is changed.

[0298] When multiple reference signal configurations are configured for the UE, the UE may determine / decide the bit width of the information related to the reference signal based on a specific bit width configuration.

[0299] The particular bit width setting may be, for example, a reference signal setting that requires the longest (or maximum) bit width.

[0300] For example, when a UE receives DCI / MAC CE associated with a reference signal configuration that corresponds to a bit width that is shorter than the longest bit width, the UE may assume that the MSB (or LSB) of the bit field is padded with a fixed value (e.g., 0 (or 1)) to make it equal to the longest bit width.

[0301] Fig. 14 is a diagram illustrating an example of the bit width of the MAC CE / DCI field according to option 7-1 of the seventh embodiment. In the example illustrated in Fig. 14, multiple reference signal configurations (DMRS configurations X and Y) are configured for the UE.

[0302] In the example shown in FIG. 14, the bit field of the information on the reference signals associated with DMRS setting X (in the example of FIG. 14, the antenna port field for DMRS setting X) is shorter than the bit field of the information on the reference signals associated with DMRS setting Y. In this case, the bit width of the information included in the MAC CE / DCI is calculated based on the bit width of the bit field of the information on the reference signals associated with DMRS setting Y, which requires a longer (longest) bit field.

[0303] In this case, the bit width of the information relating to the reference signal associated with DMRS setting X is padded with a fixed value (0) so that it is equal to the bit width of the information relating to the reference signal associated with DMRS setting Y.

[0304] Option 7-2 For the UE, it may be configured as to whether or not the bit width of the bit field of the information relating to the reference signal included in the MAC CE / DCI (format) can be changed.

[0305] This configuration may be performed using higher layer signaling (RRC signaling / MAC CE) / physical layer signaling (DCI).

[0306] If the UE is configured not to change the bit width of the bit field of the information regarding the reference signal included in the MAC CE / DCI (format), the UE may operate according to at least one of the following options 7-2-1 to 7-2-3.

[0307] [Option 7-2-1] The UE may not expect to receive MAC CE / DCI that includes information about reference signals whose bit widths are changed.

[0308] [Option 7-2-2] The UE may receive MAC CE / DCI including information about the reference signal whose bit width is to be changed.

[0309] The UE may not apply the information about the reference signal included in the MAC CE / DCI.

[0310] [Option 7-2-3] The UE may receive MAC CE / DCI including information about the reference signal whose bit width is to be changed.

[0311] The UE may apply the information about the reference signal included in the MAC CE / DCI in certain cases.

[0312] The specific case may be, for example, a case where the information about the reference signal is shorter than the bit width required for the already-set reference signal configuration, or a case where the information about the reference signal is equal to the bit width required for the already-set reference signal configuration.

[0313] The UE may not assume reception of MAC CE / DCI including information about a reference signal that is changed to a bit width longer than the bit width required for the already configured reference signal configuration.

[0314] When a UE receives DCI / MAC CE associated with a reference signal configuration that corresponds to a bit width that is shorter than the longest bit width, the UE may assume that the MSB (or LSB) of the bit field is padded with a fixed value (e.g., 0 (or 1)) to make the bit width equal to the longest bit width.

[0315] When receiving MAC CE / DCI including information about a reference signal that is changed to a bit width longer than the bit width required for the already configured reference signal configuration, the UE does not need to apply all of the information about the reference signal.

[0316] When receiving MAC CE / DCI including information about a reference signal that is changed to a bit width longer than the bit width required for the already configured reference signal configuration, the UE may apply only a portion of the information about the reference signal.

[0317] Whether any of the above options 7-2-1 to 7-2-3 is applied may be specified in advance in a specification, may be determined by a specific rule, may be set using RRC signaling, or may be determined based on UE capability information.

[0318] According to the seventh embodiment, even when the mapping of the reference signal is dynamically set / instructed, the bit field of the information relating to the reference signal can be appropriately determined.

[0319] Eighth Embodiment In the eighth embodiment, restrictions on additional reference signals will be described.

[0320] Regarding the number of symbols of the additional reference signal, at least one of the following options 8-1 and 8-2 may be applied.

[0321] In this embodiment, the additional reference signal and the additional DMRS may be interchangeable. Also, in this disclosure, the number of symbols of the additional reference signal and the number of OFDM symbols of the additional DMRS may be interchangeable.

[0322] In this embodiment, the number of symbols of the additional reference signals may be limited / determined based on the symbol position of the first (initial) reference signal, which may be a reference signal of a specific mapping type (e.g., mapping type A).

[0323] In this embodiment, the number of symbols of the additional reference signals may be limited / determined based on the symbol positions of the front-loaded reference signals.

[0324] In the present disclosure, the above restriction may mean that the number of symbols of the additional reference signal is limited based on at least one of an upper layer parameter (e.g., dmrs-TypeA-Position) indicating the position of the first reference signal, the mapping type of the UL / DL channel, and the duration of the UL / DL channel.

[0325] In the present disclosure, the above restriction may mean that the number of symbols of additional reference signals is limited based on a higher layer parameter (e.g., maxLength) indicating the maximum number of frontloaded reference signals.

[0326] Option 8-1 The UE may assume that the information regarding the reference signal does not include any configuration / instruction to exceed the limit on the number of symbols of the additional reference signal.

[0327] Option 8-2 If the information about the reference signal includes a setting / instruction to exceed the limit on the number of symbols of the additional reference signal, the UE may operate based on at least one of options 8-2-1 and 8-2-2 below.

[0328] [Option 8-2-1] The UE may apply information about the reference signal regardless of the restriction on the number of symbols of the additional reference signal.

[0329] [Option 8-2-2] The UE may not apply information about the reference signal that indicates mapping of the reference signal beyond the limit of the number of symbols of the additional reference signal.

[0330] The UE may not apply all of the information about the received reference signals.

[0331] The UE may not apply all of the information about the received reference signals.

[0332] Whether either of the above options 8-2-1 and 8-2-2 is applied may be specified in advance in a specification, may be determined by a specific rule, may be set using RRC signaling, or may be determined based on UE capability information.

[0333] According to the eighth embodiment, even when the mapping of the reference signal is dynamically set / instructed, it is possible to appropriately perform operations related to limiting the number of symbols of the additional reference signal.

[0334] <Ninth embodiment> At least one of the above embodiments may be applied only to UEs that have reported or support a particular UE capability.

[0335] The specific UE capabilities may indicate at least one of the following: · Whether or not each embodiment supports specific operations / information. -Whether or not each option / combination of options in each embodiment is supported.

[0336] The UE capabilities may be reported as whether the UE is capable or not.

[0337] The UE capabilities may be reported for all frequencies, per frequency, per frequency range (e.g., Frequency Range 1 (FR1), Frequency Range 2 (FR2), FR2-1, FR2-2), per cell, or per subcarrier spacing (SCS).

[0338] The UE capabilities may be reported jointly for Time Division Duplex (TDD) and Frequency Division Duplex (FDD), or may be reported independently.

[0339] At least one of the above-described embodiments may be applied when the UE is configured with specific information related to the above-described embodiments by higher layer signaling. For example, the specific information may be information indicating reduced CSI feedback / enabling reduced CSI feedback, any RRC parameter for a specific release (e.g., Rel. 18), etc.

[0340] According to the ninth embodiment, the UE can achieve the above functions while maintaining compatibility with existing specifications.

[0341] (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.

[0342] 15 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication 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).

[0343] 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.

[0344] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0345] 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 the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0346] 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.

[0347] 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 (CC) and dual connectivity (DC).

[0348] 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 above 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 be a frequency band higher than FR2.

[0349] 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.

[0350] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 interface, or the like) or wirelessly (for example, 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.

[0351] 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.

[0352] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0353] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio 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).

[0354] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0355] 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.

[0356] 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)), etc. may be used as an uplink channel.

[0357] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0358] 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.

[0359] 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 an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0360] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search 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 a CORESET associated with a certain search space based on the search space configuration.

[0361] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0362] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement 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.

[0363] 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.

[0364] 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, 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 as DL-RS.

[0365] 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 the SS (PSS, SSS) and the PBCH (and 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 reference signals.

[0366] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. 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).

[0367] (base station) 16 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.

[0368] 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.

[0369] 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.

[0370] 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 to be transmitted as signals, control information, sequences, etc., 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.

[0371] 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.

[0372] The transmitting / receiving unit 120 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 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0373] 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 pertains, such as an array antenna.

[0374] 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.

[0375] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0376] The transceiver 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.

[0377] The transceiver 120 (transmission processor 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.

[0378] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0379] 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 .

[0380] 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.

[0381] 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.

[0382] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0383] 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.

[0384] The transmitting / receiving unit 120 may transmit one or more reference signal configurations. The control unit 110 may control at least one of transmission and reception of the reference signal to which at least a part of at least one of the reference signal configurations is applied, based on at least one of information related to the reference signal and a specific condition (first embodiment).

[0385] The transceiver 120 may transmit one or more reference signal configurations using Radio Resource Control (RRC) signaling, and may transmit information about the reference signals using at least one of Downlink Control Information (DCI) and Medium Access Control (MAC) Control Element (CE). The controller 110 may determine mapping of the reference signals using the reference signal configurations and the information about the reference signals (second and third embodiments).

[0386] The transceiver 120 may transmit one or more reference signal configurations and information about the reference signals. The controller 110 may determine an application period for the information about the reference signals and determine mapping of the reference signals using the reference signal configurations and the information about the reference signals (fourth embodiment).

[0387] The transceiver 120 may transmit information related to a reference signal using at least one of Downlink Control Information (DCI) and Medium Access Control (MAC) Control Element (CE). When a resource for the reference signal based on the information related to the reference signal and a resource for another reference signal different from the reference signal are set to overlap each other, the control unit 110 may control transmission of the reference signal and the other reference signal (fifth embodiment).

[0388] (user terminal) 17 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.

[0389] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, 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.

[0390] 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, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0391] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also 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.

[0392] 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 from 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.

[0393] 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.

[0394] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0395] 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.

[0396] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0397] The transceiver 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.

[0398] The transceiver 220 (transmission processor 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.

[0399] 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 when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0400] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0401] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0402] The transceiver 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 to acquire user data, etc.

[0403] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, 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.

[0404] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0405] The transceiver 220 may receive one or more reference signal configurations. The controller 210 may control application of at least one of the reference signal configurations based on at least one of information related to the reference signal and a specific condition (first embodiment).

[0406] The reference signal configuration may include at least one of a demodulation reference signal configuration and a phase tracking reference signal configuration (first embodiment).

[0407] The control unit 210 may select / determine one reference signal configuration from the plurality of reference signal configurations that are set based on the information related to the reference signal and the specific condition (first embodiment).

[0408] The specific condition may be a condition based on at least one of application of bundling of reference signals, whether or not transmission of a channel spanning multiple slots is performed, overlap with other reference signals different from the reference signal, modulation order, number of layers, number of ports of the reference signal, format of downlink control information for scheduling a physical downlink shared channel or a physical uplink shared channel, whether or not the reference signal is used for a specific channel, a radio network temporary identifier used for scrambling a cyclic redundancy check of the downlink control information, setting of a configured grant, whether or not the downlink control information includes information about the reference signal, a state of the terminal corresponding to a learning state, and a speed of the terminal (first embodiment).

[0409] The transceiver 220 may receive one or more reference signal configurations using Radio Resource Control (RRC) signaling, and may receive information about the reference signals using at least one of Downlink Control Information (DCI) and Medium Access Control (MAC) Control Element (CE). The controller 210 may control mapping of the reference signals based on the reference signal configurations and the information about the reference signals (second and third embodiments).

[0410] The control unit 210 may determine at least one of a slot and a symbol to which the reference signal is not mapped, based on information related to the reference signal (second embodiment).

[0411] The control unit 210 may determine subcarriers to which the reference signal is not mapped based on information related to the reference signal (second embodiment).

[0412] The control unit 210 may determine an orthogonal cover code sequence to be applied to the reference signal based on information related to the reference signal (second embodiment).

[0413] The transceiver 220 may receive one or more reference signal configurations and information about the reference signals. The controller 210 may determine an application period for the information about the reference signals and determine mapping of the reference signals based on the reference signal configurations and the information about the reference signals (fourth embodiment).

[0414] If the reference signal is a reference signal for a channel that is scheduled or activated over multiple slots, the control unit 210 may apply information about the reference signal to all of the channels (fourth embodiment).

[0415] If the reference signal is a reference signal for a channel that is scheduled or activated over multiple slots, the control unit 210 may apply information about the reference signal at the first transmission opportunity of the channel (fourth embodiment).

[0416] The control unit 210 may determine at least one of the start and end of application of the information related to the reference signal after a first period has elapsed after receiving the information related to the reference signal, and at least one of the first period having elapsed after receiving a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) for downlink control information including the information related to the reference signal (fourth embodiment).

[0417] The transceiver 220 may receive information about a reference signal using at least one of Downlink Control Information (DCI) and Medium Access Control (MAC) Control Element (CE). When a resource for the reference signal based on the information about the reference signal and a resource for another reference signal different from the reference signal are set to overlap each other, the control unit 210 may control reception of the reference signal and the other reference signal (fifth embodiment).

[0418] The control unit 210 may determine the decoding time of the physical downlink shared channel based on information about the additional reference signal included in the DCI (sixth embodiment).

[0419] When multiple reference signal settings are set and the bit width required for the information about the reference signal for each of the multiple reference signal settings is different, the control unit 210 may determine that the bit width of the information about the reference signal is a fixed value, or may assume that the bit width is padded to the fixed value (seventh embodiment).

[0420] The control unit 210 may determine whether the information about the reference signal includes an instruction to exceed the limit on the number of symbols in the additional reference signal (eighth embodiment).

[0421] (Hardware configuration) 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 also be realized by combining the single device or multiple devices with software.

[0422] 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 mentioned above, the implementation method of each is not particularly limited.

[0423] 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. 18 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.

[0424] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may be read 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.

[0425] 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.

[0426] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined 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.

[0427] 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), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0428] 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 realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0429] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0430] Storage 1003 is a computer-readable recording medium and may be constituted by 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, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0431] 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.

[0432] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0433] 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.

[0434] 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 such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0435] (Variation) Note that terms explained 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.

[0436] 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.

[0437] 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, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0438] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol), and may be a time unit based on numerology.

[0439] 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.

[0440] 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.

[0441] 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 a subframe and a 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.

[0442] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0443] 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.

[0444] 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.

[0445] 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.

[0446] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0447] 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 also be determined based on numerology.

[0448] 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. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0449] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0450] 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.

[0451] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0452] The BWP may include an UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0453] 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."

[0454] 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.

[0455] 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.

[0456] 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.

[0457] 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.

[0458] 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.

[0459] 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.

[0460] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, 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.

[0461] Note that the physical layer signaling may be called 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 called 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).

[0462] 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).

[0463] 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).

[0464] 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.

[0465] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0466] 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).

[0467] In the present 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," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0468] In this 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.

[0469] 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 divided 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 term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0470] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0471] 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.

[0472] 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.

[0473] 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.

[0474] 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.

[0475] 19 is a diagram showing an example of a vehicle according to an embodiment. 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.

[0476] 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 the user.

[0477] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (e.g., 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).

[0478] 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.

[0479] 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 (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0480] 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.

[0481] The driving assistance system unit 64 is configured with various devices that provide functions for preventing accidents and reducing 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.

[0482] 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.

[0483] 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 above-mentioned base station 10 or user terminal 20. Furthermore, the communication module 60 may be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (or may function as at least one of the base station 10 and user terminal 20).

[0484] 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.

[0485] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from external devices 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)).

[0486] 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.

[0487] 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 uplink channel and downlink channel may be read as sidelink channel.

[0488] 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.

[0489] 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) and a Serving-Gateway (S-GW)), or a combination thereof.

[0490] 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 specific order presented.

[0491] 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 The present invention may be applied to systems that use 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. It may also be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0492] 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."

[0493] 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.

[0494] 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.

[0495] 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.

[0496] Also, "decision" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "decision" may be considered to be "deciding" on some action.

[0497] Furthermore, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," or the like.

[0498] 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."

[0499] 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.

[0500] 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."

[0501] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0502] 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.

[0503] 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 invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. a receiver for receiving one or more reference signal configurations and information about the reference signals; a control unit that determines an application period of information related to the reference signal, and determines mapping of the reference signal based on the reference signal setting and the information related to the reference signal; When the reference signal is a reference signal for a channel scheduled over a plurality of slots, the control unit applies information related to the reference signal to all of the channels.

2. receiving one or more reference signal configurations and information about the reference signals; determining an application period of the information about the reference signal, and controlling mapping of the reference signal based on the reference signal configuration and the information about the reference signal; A wireless communication method for a terminal, wherein, when the reference signal is a reference signal for a channel scheduled over a plurality of slots, information about the reference signal is applied to all of the channels.

3. a transmitter configured to transmit one or more reference signal configurations and information related to the reference signals; a control unit that determines an application period of information related to the reference signal, and determines mapping of the reference signal using the reference signal configuration and the information related to the reference signal; When the reference signal is a reference signal for a channel scheduled over a plurality of slots, the transmitter transmits information regarding the reference signal to be applied to all of the channels.

4. A system including a terminal and a base station, The terminal a receiver for receiving one or more reference signal configurations and information about the reference signals; a control unit that determines an application period of information related to the reference signal, and determines mapping of the reference signal based on the reference signal setting and the information related to the reference signal; When the reference signal is a reference signal for a channel scheduled over a plurality of slots, the control unit applies information about the reference signal to all of the channels; The base station A system comprising the reference signal setting and a transmitter that transmits information about the reference signal.

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