Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is provided with: a reception unit that receives information relating to a reference carrier; and a control unit that performs a first Doppler correction in the reference carrier on the basis of the information, and performs a second Doppler correction in a carrier other than the reference carrier on the basis of the information and the first Doppler correction. According to one embodiment of the present disclosure, Doppler correction can be appropriately performed.

Description

Technical Field

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

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further high-speed data rates and low latency (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been standardized for the purpose of further increasing capacity and increasing sophistication (advanced) than LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Subsequent systems of LTE (for example, also known as the fifth generation mobile communication system (5G), 5G+(plus), the sixth generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 and later, etc.) are also discussed.

[0004] Prior art literature

[0005] Non-patent literature

[0006] 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

[0007] Problems to be solved by the invention

[0008] It is envisioned that in NR, a beam is transmitted from a transmission point (e.g., a remote radio head (RRH)) configured on the path of a moving body in order to achieve wireless communication in a moving body (e.g., a train) that moves at high speed.

[0009] In addition, it is envisioned that in future wireless communication systems (e.g., 6G), higher frequencies than existing frequencies (e.g., Rel. 15 / 16 / 17) will be utilized.

[0010] However, there has been insufficient research on the Doppler correction method of UE / base station in an environment where the UE moves at high speed and utilizes high frequencies to be introduced in future wireless communication systems (e.g., 6G).

[0011] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station capable of appropriately performing Doppler correction.

[0012] Means for solving problems

[0013] A terminal according to one embodiment of the present disclosure comprises: a receiving unit that receives information related to a reference carrier; and a control unit that performs a first Doppler correction in the reference carrier based on the information, and performs a second Doppler correction in a carrier other than the reference carrier based on the information and the first Doppler correction.

[0014] Effects of the Invention

[0015] According to one aspect of the present disclosure, Doppler correction can be appropriately performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1A as well as Figure 1B This is a diagram showing an example of communication between a mobile object and a transmission point (for example, RRH).

[0017] FIG. 2A to FIG. 2C This is a diagram showing an example of schemes 0 to 2 related to SFN.

[0018] Figure 3A as well as Figure 3B This is a diagram showing an example of scheme 1.

[0019] FIG. 4A to FIG. 4C This is a diagram showing an example of a NW pre-compensation scheme.

[0020] Figure 5 This is a diagram showing an example of mapping of reference signals.

[0021] Figure 6It is a diagram showing an example of Doppler correction / carrier frequency calculation according to the first embodiment.

[0022] Figure 7 This is a diagram showing an example of a combination of a plurality of carriers / bands according to the first embodiment.

[0023] Figure 8 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0024] Fig. 9 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0025] Fig.10 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0026] Fig.11 This is a diagram showing an example of the hardware configuration of a base station and a user terminal involved in one embodiment.

[0027] Fig.12 This is a diagram showing an example of a vehicle according to an embodiment. DETAILED DESCRIPTION

[0028] (HST)

[0029] In LTE, it is difficult to configure HST (high speed train) in a tunnel. A large antenna transmits to the outside / inside of the tunnel. For example, the transmission power of a large antenna is about 1 to 5 W. For switching, it is important to transmit to the outside of the tunnel before the UE enters the tunnel. For example, the transmission power of a small antenna is about 250 mW. Multiple small antennas (transmitting and receiving points) with the same cell ID and a distance of 300 m form a single frequency network (SFN). All small antennas in the SFN send the same signal at the same time on the same PRB. The terminal is assumed to transmit and receive to one base station. In fact, multiple transmitting and receiving points send the same DL signal. When moving at high speed, transmitting and receiving points in units of several kilometers form a cell. Switching is performed when crossing cells. This can reduce the switching frequency.

[0030] In NR, in order to communicate with a terminal (hereinafter also referred to as UE) included in a high-speed train (HST), it is assumed that a beam transmitted from a transmission point (for example, RRH) is used. In existing systems (for example, Rel.15), it is supported to transmit a unidirectional beam from the RRH to communicate with the mobile body (see Figure 1A ).

[0031] exist Figure 1A In FIG. 1 , it is shown that RRHs are configured along the moving path (or moving direction, traveling transmission, walking path) of a moving body, and beams are formed from each RRH in the moving direction of the moving body. An RRH that forms a unidirectional beam can also be called a uni-directional RRH. Figure 1A In the example shown, the mobile object receives a negative Doppler shift (-f D ).

[0032] In addition, although the case where the beam is formed on the moving direction side of the moving body is shown here, the present invention is not limited to this, and the beam may be formed on the opposite direction to the moving direction, or the beam may be formed in any direction regardless of the moving direction of the moving body.

[0033] After Rel. 16, it is also assumed that multiple (for example, more than two) beams are transmitted from the RRH. For example, it is assumed that beams are formed in two directions, the moving direction of the moving object and the reverse direction (see Figure 1B ).

[0034] exist Figure 1B , it is shown that RRHs are arranged along the moving path of a moving body, and beams are formed from each RRH in two directions, namely, in the moving direction of the moving body and in the opposite direction of the moving direction. RRHs that form beams in multiple directions (for example, 2 directions) may also be referred to as bidirectional RRHs.

[0035] In HST, UE also communicates with a single TRP. In a base station installation, it is possible to send from multiple TRPs (same cell ID).

[0036] exist Figure 1B In the example of , when two RRHs (here, RRH#1 and RRH#2) use SFN, the mobile object switches from receiving a signal with a negative Doppler shift to receiving a signal with a positive Doppler shift with increased power between the two RRHs. In this case, the maximum Doppler shift change range that needs to be corrected is from -f D becomes +f D , which is twice as much as the case of unidirectional RRH.

[0037] In addition, in the present disclosure, a positive Doppler shift may also be rewritten as information related to a positive Doppler shift, a positive (+) Doppler shift, and positive (+) Doppler information. In addition, a negative Doppler shift may also be rewritten as information related to a negative Doppler shift, a negative (-) Doppler shift, and negative (-) Doppler information.

[0038] Here, as the schemes for HST, the following schemes 0 to 2 (HST scheme 0 to HST scheme 2) are compared.

[0039] exist Figure 2A In scheme 0, the tracking reference signal (TRS), DMRS, and PDSCH are sent jointly (using the same time and the same frequency resources) to two TRPs (RRHs) (normal SFN, transparent SFN, HST-SFN).

[0040] In scheme 0, the UE receives the DL channel / signal in an equivalent manner of a single TRP, so the TCI state of the PDSCH is one.

[0041] In addition, Rel.16 specifies RRC parameters for distinguishing between transmission using a single TRP and transmission using SFN. When the UE reports the corresponding UE capability information, it can also distinguish between reception of DL channels / signals of a single TRP and reception of PDSCH assuming SFN based on the RRC parameters. On the other hand, the UE can also assume a single TRP and perform transmission and reception using SFN.

[0042] exist Figure 2B In scheme 1, TRS is sent specifically to TRP (using different time / frequency resources according to TRP). In this example, TRS1 is sent from TRP#1 and TRS2 is sent from TRP#2.

[0043] In Scheme 1, the UE uses the TRS from each TRP to receive the DL channel / signal from each TRP, so the TCI state of PDSCH is 2.

[0044] exist Figure 2C In Scheme 2, TRS and DMRS are sent specifically to TRP. In this example, TRS1 and DMRS1 are sent from TRP#1, and TRS2 and DMRS2 are sent from TRP#2. Compared with Scheme 0, Schemes 1 and 2 suppress the rapid change of Doppler shift and can properly estimate / maintain Doppler shift. The DMRS of Scheme 2 is increased compared to that of Scheme 1, so the maximum throughput of Scheme 2 is lower than that of Scheme 1.

[0045] In scheme 0, the UE switches between single TRP and SFN based on high-layer signaling (RRC information element / MAC CE).

[0046] The UE may also switch scheme 1 / scheme 2 / NW precompensation scheme based on high-layer signaling (RRC information element / MAC CE).

[0047] In scheme 1, two TRS resources are set for the HST's traveling direction and its reverse direction respectively.

[0048] exist Figure 3A In the example, the TRP (TRP#0, #2, ...) that sends DL signals in the opposite direction of the HST sends the first TRS (TRS coming from the front of the HST) in the same time and frequency resources (SFN). The TRP (TRP#1, #3, ...) that sends DL signals in the direction of the HST sends the second TRS (TRS coming from the back of the HST) in the same time and frequency resources (SFN). The first TRS and the second TRS can also be sent / received using different frequency resources.

[0049] exist Figure 3B In the example of FIG. 1 , TRS1-1 to 1-4 are sent as the first TRS, and TRS2-1 to 2-4 are sent as the second TRS.

[0050] Considering the beam operation, the first TRS is sent using 64 beams and 64 time resources, and the second TRS is sent using 64 beams and 64 time resources. It is considered that the beam of the first TRS is equal to the beam of the second TRS (QCL type D RS is equal). By multiplexing the first TRS and the second TRS to the same time resource and different frequency resources, resource utilization efficiency can be improved.

[0051] exist Figure 4A In the example, RRH#0 to #7 are configured along the moving path of the HST. RRH#0 to #3 and RRH#4 to #7 are connected to baseband units (BBU) #0 and #1, respectively. Each RRH is a bidirectional RRH, and a beam is formed using each transmission / reception point (TRP) in both the moving direction and the reverse direction of the moving path.

[0052] exist Figure 4B In the example (single TRP (SFN) / Scheme 1), when the UE receives the signal / channel (beam in the direction of travel of the HST, beam from behind the UE) sent from TRP#2n-1 (n is an integer greater than 0), a negative Doppler shift (-f in this example) is caused. D In addition, when the UE receives a signal / channel (a beam in the opposite direction of the HST's direction of travel, a beam from the front of the UE) sent from TRP#2n (n is an integer greater than 0), a positive Doppler shift (in this example, +f D ).

[0053] After Rel.17, the correction (compensation) of Doppler shift in the transmission of downlink (DL) signals / channels from TRP to UEs in HST is discussed (also referred to as Doppler correction (Doppler Compensation), pre-Doppler correction (Pre-Doppler Compensation (Pre-Doppler Compensation, Doppler pre-Compensation), network (NW) pre-correction scheme (NW pre-compensation scheme (NW pre-compensationscheme), HST NW pre-compensation scheme (HST NW pre-compensation scheme))). When TRP transmits DL signals / channels to UEs, it performs Doppler correction in advance, thereby reducing the impact of Doppler shift when receiving DL signals / channels in UEs. In the present disclosure, the NW pre-compensation scheme may also be a combination of Scheme 1 and pre-compensation of Doppler shift based on the base station.

[0054] After Rel.17, the discussion is about sending the TRS from each TRP without Doppler correction, and sending the PDSCH from each TRP after Doppler correction.

[0055] In the NW pre-compensation scheme, the TRP that forms a beam on the moving direction side of the moving path and the TRP that forms a beam on the opposite direction side of the moving path transmit DL signals / channels to the UE in the HST after performing Doppler correction. In this example, TRP#2n-1 performs positive Doppler correction and TRP#2n performs negative Doppler correction, thereby reducing the influence of Doppler shift when the UE receives the signal / channel ( Figure 4C ).

[0056] In addition, Figure 4C In this case, the UE uses the TRS from each TRP to receive the DL channel / signal from each TRP, so the TCI state of PDSCH can also be 2.

[0057] (analyze)

[0058] In future wireless communication systems (e.g., 6G), in order to further improve communication speed, communication capacity, reliability, and delay performance, it is envisioned to utilize higher frequencies and wider bandwidths than 5G (e.g., Rel. 15 / 16 / 17).

[0059] Furthermore, it is envisioned that in order to increase communication speed, carrier aggregation (CA) / dual connectivity (DC) including enhanced high frequencies is implemented in future wireless communication systems.

[0060] In addition, further speed-up of transportation (for example, magnetic levitation trains, etc.) is also being studied, and the introduction of transportation that exceeds the current operating speed is envisioned.

[0061] That is, in future wireless communication systems, it is considered that CA / DC will be performed in an environment exceeding the existing (assumed) operating speed.

[0062] One factor that affects the communication quality of UE is Doppler, which can be calculated by (Doppler)=(UE moving speed)×(carrier frequency) / (light speed).

[0063] The UE performs Doppler correction based on the reception results of the reference signals at two different timings.

[0064] When there is no phase difference between the two reference signals, the UE determines that there is no Doppler change.

[0065] When there is a phase difference between the two reference signals, the UE performs Doppler correction based on the phase difference.

[0066] If the phase difference exceeds 180° or -180°, the phase rotation cannot be measured. Therefore, when the time interval (period) between the two reference signals is greater than a certain value, Doppler correction cannot be achieved. Specifically, when the phase difference exceeds 180° or -180°, the phase rotation θ can be θ+360×n(°) (n is an arbitrary integer), so Doppler correction cannot be performed.

[0067] Similarly, from a frequency perspective, if the Doppler variation exceeds a certain frequency (e.g., 1 / (2×reference signal time interval)), Doppler correction cannot be performed. Specifically, when the period of 4 symbols is set to 120kHz (reference Figure 5 ), Doppler correction (Doppler estimation) cannot be performed when the frequency of the reference signal exceeds 14000 Hz.

[0068] As described above, in future wireless communication systems, when a higher frequency band than ever before is used, the influence of Doppler will be more severe.

[0069] For example, in an HST environment (e.g., an environment where the UE moves at high speed (e.g., about 500 km / h)), Doppler correction can be appropriately performed for frequencies used in existing wireless communication systems. On the other hand, it is assumed that Doppler correction cannot be appropriately performed for frequencies higher than existing frequencies that are used in future wireless communication systems.

[0070] Therefore, in an environment where the UE moves at high speed, there is a concern that even if CA / DC including a high frequency to be enhanced in a future wireless communication system is performed, the improvement of the communication speed is limited. In other words, in an environment where the UE moves at high speed, when CA / DC including a high frequency to be enhanced in a future wireless communication system is performed, although communication is possible in the existing frequency carrier, communication is not possible in the high frequency to be enhanced in the future wireless communication system.

[0071] There has been insufficient research on Doppler correction methods for frequencies to be enhanced in future wireless communication systems. In the absence of sufficient research, improvements in high-speed mobility, communication capacity, reliability, and delay performance are hindered, and there is a concern that communication throughput may be reduced.

[0072] Therefore, the inventors of the present invention conceived a Doppler correction method using a higher frequency than the conventional frequency.

[0073] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the embodiments may be applied individually or in combination.

[0074] In the present disclosure, "A / B" and "at least one of A and B" may be replaced with each other. In addition, in the present disclosure, "A / B / C" may also mean "at least one of A, B, and C".

[0075] In the present disclosure, activate, deactivate, indicate (or specify), select, configure, update, determine, etc. may also be mutually rewritten. In the present disclosure, support, control, controllable, operate, and operate may also be mutually rewritten.

[0076] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, high-layer parameters, fields, Information Element (IE), settings, etc. may also be mutually overwritten. In the present disclosure, Medium Access Control (MAC) Control Element (CE), update commands, activation / deactivation commands, etc. may also be mutually overwritten.

[0077] In the present disclosure, the high-layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0078] In the present disclosure, MAC signaling may also use, for example, MAC Control Element (MACCE), MAC Protocol Data Unit (PDU), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (Other System Information (OSI)), etc.

[0079] In the present disclosure, the physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI)), etc.

[0080] In the present disclosure, index, identifier (ID), indicator, resource ID, etc. may also be mutually overwritten. In the present disclosure, sequence, list, set, group, group, cluster, subset, etc. may also be mutually overwritten.

[0081] In the present disclosure, panel, UL panel, panel group, beam, beam group, precoder, uplink (UL) transmission entity, transmission / reception point (TRP)), base station, spatial relation information (SpatialRelationInformation(SRI)), spatial relation, SRS resource indicator (SRS Resource Indicator(SRI)), control resource set (COntrol REsource SET(CORESET)), physical downlink shared channel (Physical Downlink Shared Channel(PDSCH)), codeword (Codeword(CW)), transport block (TransportBlock(TB)), reference signal (ReferenceSignal(RS)), antenna port (e.g., demodulation reference signal (Demodulation ReferenceSignal(DMRS)) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relation group, code division multiplexing (Code Division Multiplexing(CDM)) group, reference signal group, CORESET group), physical uplink control channel (Physical Uplink Control Channel (PUCCH)) group, PUCCH resource group), resources (for example, reference signal resources, SRS resources), resource sets (for example, reference signal resource sets), CORESET pool, downlink transmission configuration indication state (Transmission Configuration Indication state (TCI state)) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state (unified TCI state), common TCI state (common TCI state), Quasi-Co-Location (QCL)), QCL assumptions, QCL relationships, etc. can also be rewritten with each other.

[0082] In addition, the spatial relationship information indicator (Identifier (ID)) (TCI state ID) and the spatial relationship information (TCI state) can also be overwritten with each other. "Spatial relationship information" can also be overwritten with "a collection of spatial relationship information", "one or more spatial relationship information", etc. TCI state and TCI can also be overwritten with each other.

[0083] In the present disclosure, frequency, frequency band, band, operating band, bandwidth, bandwidth part (BWP), carrier, frequency range, component carrier (CC), cell, combination of bands, combination of carriers, pair of bands, and pair of carriers may also be replaced with each other.

[0084] In the present disclosure, the first frequency / carrier may also represent, for example, a frequency / carrier specified in an existing specification (e.g., NR (Rel.15 / 16 / 17)). In the present disclosure, the second frequency / carrier may also represent, for example, a frequency / carrier to be introduced / enhanced in a future wireless communication system (e.g., 6G).

[0085] In the following, in the present disclosure, an example is mainly described in which the first frequency / carrier represents the frequency / carrier specified in the existing specification (for example, NR (Rel.15 / 16 / 17)), and the second frequency / carrier represents the frequency / carrier to be introduced / enhanced in the future wireless communication system (for example, 6G), but this is only an example, and the first / second frequency / carrier is not limited to this.

[0086] For example, in the present disclosure, the first frequency / carrier may also be a frequency / carrier less than a specific threshold. In the present disclosure, the second frequency / carrier may also be a frequency / carrier greater than a specific threshold. The specific threshold may be pre-defined in the specification or may be set to the UE.

[0087] In the present disclosure, channel, signal, reference signal (RS), channel / signal may also be overwritten with each other. In the present disclosure, DL channel, DL signal, DL channel / signal, reception of DL channel / signal, DL reception, transmission of DL channel / signal, DL transmission may also be overwritten with each other. In the present disclosure, UL channel, UL signal, UL channel / signal, reception of UL channel / signal, UL reception, transmission of UL channel / signal, UL transmission may also be overwritten with each other.

[0088] In the present disclosure, Doppler, Doppler change, Doppler shift, Doppler spread, Doppler correction, Doppler compensation, Doppler estimation, Doppler frequency, Doppler amount, Doppler value, and Doppler-related parameters may also be rewritten mutually.

[0089] (Wireless Communication Method)

[0090] The UE may also communicate using multiple carriers. For example, the UE may be configured with CA / DC.

[0091] In the following, in each embodiment of the present disclosure, the subject that performs Doppler correction may also be UE or base station. In each embodiment of the present disclosure, the case where UE performs operations related to Doppler correction is mainly described, but "UE" may be appropriately replaced with "base station".

[0092] For example, the UE may also perform Doppler correction using the DL channel / signal. The UE may also apply the Doppler correction to at least one of the reception of the DL channel / signal and the transmission of the UL channel / signal.

[0093] For example, the base station may also perform Doppler correction using the UL channel / signal. The base station may also apply Doppler correction to at least one of the transmission of the DL channel / signal and the reception of the UL channel / signal.

[0094] The calculation of the Doppler amount in the UE / base station may be performed based on the reception results of the reference signal at two different timings.

[0095] The reference signal used in estimating / calculating the Doppler amount (Doppler estimation) may be any DL / UL reference signal.

[0096] The DL reference signal may be, for example, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), a tracking reference signal (Tracking Reference Signal (TRS)), a synchronization signal, at least one of the SS / PBCH blocks, or may be a DL reference signal other than these.

[0097] The UL reference signal may be a sounding reference signal (SRS), a demodulation reference signal (DMRS), or any other UL reference signal.

[0098] In the present disclosure, the Doppler correction performed by the UE (for example, the Doppler correction in the first embodiment below) can also be applied in combination with the Doppler correction performed by the base station (for example, the Doppler correction in the first embodiment below, and at least one of the NW pre-compensation schemes), and the combination can also be applied, for example, only in the following reference carrier.

[0099] The notification of information / parameters in each embodiment of the present disclosure may also be set / activated / indicated / notified to the UE via higher layer signaling (RRC / MACCE), physical layer signaling (DCI), and a combination thereof.

[0100] The notification of information / parameters in each embodiment of the present disclosure may also be performed based on the reported UE capability information (UECapability information).

[0101] In the present disclosure, information for activating (enabling) / deactivating (disabling) functions related to the first / second embodiment may be set for the UE.

[0102] <First Embodiment>

[0103] The UE may perform at least one of Doppler correction for a specific carrier (which may also be referred to as a base (reference) carrier) and Doppler correction for carriers other than the specific carrier based on the specific carrier.

[0104] For example, the specific carrier may be a carrier included in the first carrier, and carriers other than the specific carrier may be carriers included in the first carrier and the second carrier.

[0105] The UE may perform Doppler correction for a specific carrier based on the specific carrier (reference carrier). In addition, the UE may perform Doppler correction for carriers other than the specific carrier based on the result of the Doppler correction for the specific carrier.

[0106] The base station may set / instruct the UE to at least one of: perform Doppler correction on a specific carrier, and perform Doppler correction on a carrier other than the specific carrier.

[0107] The UE may also perform Doppler correction according to the following steps 1 to 3 (refer to Figure 6 ):

[0108] Step 1: The UE may also perform Doppler correction for a specific carrier (reference) and may also calculate the carrier frequency of the carrier.

[0109] Step 2: The UE may also calculate the moving speed of the UE using the Doppler correction value (amount) and the carrier frequency.

[0110] Step 3: The UE may measure / calculate the Doppler of a carrier other than the specific carrier. At this time, the frequency of the carrier other than the specific carrier may be calculated based on the measured / calculated Doppler and the moving speed of the UE.

[0111] In step 2, the UE may also calculate the moving speed of the UE using the formula: (moving speed) = (Doppler) x (speed of light) / (carrier frequency).

[0112] In step 3, the UE may calculate the frequency of a carrier other than the specific carrier using the formula (carrier frequency) = (Doppler) x (light speed) / (moving speed). The moving speed of the UE is the same for all carriers, so the carrier frequency can be calculated by using this formula.

[0113] According to the above steps 1 to 3, for example, when CA / DC is set for the UE, the UE can determine all carrier frequencies for performing CA / DC. In other words, by determining the frequency of a specific carrier (for example, the lowest frequency among the carriers for performing CA / DC), the frequency of the carrier that exceeds the limit of Doppler correction can be calculated.

[0114] The UE may be configured / instructed to perform Doppler correction in the present embodiment by the network (base station). The configuration / instruction may be configured / instructed by using higher layer signaling (RRC / MAC CE) / physical layer signaling (DCI).

[0115] The UE may receive information about the specific carrier (reference carrier) from the base station. The information may be set / indicated using higher layer signaling (RRC / MAC CE) / physical layer signaling (DCI).

[0116] The information related to a specific carrier may also indicate the frequency of the carrier. The frequency of the carrier may also be indicated by at least one of the number of the operating band of the carrier, the center frequency of the carrier, and a frequency grid.

[0117] The information about the specific carrier may be an RRC parameter for setting CA / DC. The information about the specific carrier may be included in the RRC parameter for setting CA / DC.

[0118] The specific carrier may also be a carrier in any RAT (Radio Access Technology).

[0119] For example, when the UE is configured to utilize DC (e.g., EN / NE-DC) of a first RAT (e.g., LTE (E-UTRA)) and a second RAT (e.g., (NR)), the specific carrier may also be a carrier in the first (or, second) RAT.

[0120] For example, when the DC using the first RAT and the second RAT is set for the UE and the frequency of the carrier in the first RAT is determined, the specific carrier may be the carrier in the first RAT.

[0121] For example, when the DC using the first RAT and the second RAT is set for the UE and the frequency of the carrier in the second RAT is determined, the specific carrier may be the carrier in the second RAT.

[0122] For example, when the DC using the first RAT and the second RAT is set for the UE and the frequency of the carrier in the first RAT is determined, the specific carrier may be the carrier in the second RAT.

[0123] For example, when the DC using the first RAT and the second RAT is set for the UE and the frequency of the carrier in the second RAT is determined, the specific carrier may be the carrier in the first RAT.

[0124] The specific carrier may also be more than one carrier.

[0125] For example, when the UE is configured to use the DC of the first RAT and the second RAT, the specific carrier may be multiple (eg, 2) carriers in the first RAT. The specific carrier may also be used to determine the carrier frequency in the first / second RAT.

[0126] For example, when the UE is configured to use the DC of the first RAT and the second RAT, the specific carrier may be multiple (eg, 2) carriers in the second RAT. The specific carrier may also be used to determine the carrier frequency in the first / second RAT.

[0127] For example, when the DC using the first RAT and the second RAT is set for the UE, the specific carrier may also be a combination of one or more carriers in the first RAT and one or more carriers in the second RAT (may also be referred to as a group / pair / set, etc.). The specific carrier may also be used to determine the carrier frequency in the first / second RAT.

[0128] When a plurality of carriers are used for a specific carrier, for example, the UE may calculate the average of the moving speeds of the UE calculated for each carrier in step 2 above.

[0129] By using a plurality of carriers for a specific carrier, the calculation accuracy of the moving speed of the UE can be improved, and the accuracy of Doppler correction in carriers other than the specific carrier can be improved.

[0130] The specific carrier may be a carrier having a frequency lower than a specific threshold.

[0131] For example, the specific carrier may be a carrier with the lowest frequency among a plurality of carriers configured for the UE. Also, for example, the specific carrier may be a carrier with the lowest frequency in each RAT.

[0132] The specific carrier may also be determined based on the setting of the reference signal. The determination may also be made by the base station. The UE may also assume that a specific carrier is set / indicated based on the setting of the reference signal.

[0133] The setting of the reference signal may also be the setting of the time interval between reference signals or the period of the reference signal.

[0134] For example, the base station may determine a RAT with high Doppler tolerance based on the setting of the reference signal. The base station may determine that a setting in which at least one of the time interval between reference signals and the period of the reference signal is short is a setting with high Doppler tolerance. The base station may also notify the UE of the carrier in the RAT with the shortest time interval between reference signals or the shortest period of the reference signal among multiple RATs set for the UE as a specific carrier.

[0135] When a plurality of specific carriers are set, the UE may use one of the carriers for determining the frequencies of other carriers. At this time, when the Doppler correction of the one carrier fails, the UE may determine to use the other carriers for determining the frequencies of the carriers.

[0136] For example, when Doppler correction based on a carrier in the first (or second) RAT fails, the UE may perform Doppler correction using a carrier in the second (or first) RAT and determine the frequency of other carriers.

[0137] A UE may be configured with a plurality of carrier / band combinations (also referred to as pairs, groups, sets, etc.) for a specific carrier, and may be configured with more than one such combination.

[0138] Figure 7 FIG. 1 is a diagram showing an example of a combination of a plurality of carrier waves / bands according to the first embodiment. Figure 7 For example, when CA using band A to band D is configured for UE, a combination of band A and band B and a combination of band C and band D may be configured for UE as specific carriers.

[0139] For example, the carriers / bands included in the combination may be carriers / bands having the same QCL relationship.

[0140] The carriers / bands included in the combination may be determined based on the physical distance between base stations corresponding to the carriers / bands.

[0141] For example, the network may determine the carrier / band included in the combination as a carrier / band corresponding to multiple (e.g., 2) base stations with a close physical distance between the base stations. The UE may also assume that the carrier / band included in the combination is set to a carrier / band corresponding to multiple (e.g., 2) base stations with a close physical distance between the base stations.

[0142] For example, the carrier / band included in the combination may also be a combination of the following two: a carrier / band corresponding to a base station (first base station) in a certain direction relative to the UE, and a carrier / band corresponding to a base station (second base station) in a direction different from the certain direction. In this case, for the first base station and the second base station, the network may also determine based on the physical distance, or the UE may determine based on an index related to the beam used.

[0143] According to this method, the (relative) moving speed of the UE with respect to each base station depends on the distance / angle between the base station and the UE, so that Doppler correction can be performed with higher accuracy.

[0144] In addition, for example, the carrier / band included in the combination may also be a combination of the following two: a carrier / band corresponding to a base station (first base station) located at a distance greater than a first threshold relative to the UE, and a carrier / band corresponding to a base station (second base station) located at a distance less than a second threshold. In this case, for the first base station and the second base station, the network may also make a judgment based on the physical distance, or the UE may make a judgment based on the reported channel / signal received power / received quality. The first threshold and the second threshold may be the same value, and the first threshold may also be greater than the second threshold.

[0145] According to the first embodiment described above, Doppler correction can be appropriately performed on any carrier using a carrier serving as a reference.

[0146] <Second Embodiment>

[0147] The UE may also receive information regarding whether Doppler correction is applied to the carrier.

[0148] The information may also indicate, for example, whether the carrier satisfies a condition related to a specific threshold.

[0149] When the reference carrier described in the first embodiment is set and the reference carrier does not satisfy the condition related to the specific threshold, the UE may determine not to perform Doppler correction using the reference carrier.

[0150] Furthermore, the UE may assume that, when a certain carrier does not satisfy a condition related to a specific threshold, no reference carrier is set for the carrier.

[0151] Furthermore, when the use of multiple carriers (for example, CA / DC) is configured and a certain carrier among the multiple carriers does not satisfy a condition related to a specific threshold, the UE may assume that the reference carrier is not configured.

[0152] The specific threshold value may be, for example, a threshold value related to frequency.

[0153] For example, the UE may determine at least one of the following based on the frequencies (eg, frequency range) including the plurality of configured carriers: application of Doppler correction using the reference carrier and presence or absence of the configuration of the reference carrier.

[0154] For example, when the multiple carriers to be set are included in the same frequency range, the UE may also determine that Doppler correction using the reference carrier is performed on the multiple carriers. For example, when the multiple carriers to be set are included in the same frequency range, the UE may determine that at least one of the multiple carriers is set as the reference carrier.

[0155] For example, when the multiple carriers to be set are included in different frequency ranges, the UE may also determine that Doppler correction using the reference carrier is not performed on the multiple carriers. For example, when the multiple carriers to be set are included in different frequency ranges, the UE determines that at least one of the multiple carriers is not set as the reference carrier.

[0156] Furthermore, for example, the UE may determine at least one of the following: application of Doppler correction using a reference carrier and presence or absence of setting of a reference carrier, based on the difference in frequencies of a plurality of configured carriers.

[0157] For example, the UE may also determine that Doppler correction using a reference carrier is performed on the multiple carriers when the difference in frequency of the multiple carriers is set to be less than a specific value. For example, the UE may also determine that at least one of the multiple carriers is set as a reference carrier when the difference in frequency of the multiple carriers is set to be less than a specific value.

[0158] For example, the UE may also determine that Doppler correction using the reference carrier is not performed on the multiple carriers when the difference in the frequencies of the multiple carriers is greater than a specific value. For example, the UE may also determine that at least one of the multiple carriers is not set as the reference carrier when the difference in the frequencies of the multiple carriers is greater than a specific value.

[0159] The specific value may be pre-defined in the specification, may be set to the UE using higher layer signaling, or may be determined based on the capability information of the reported UE. The specific value may also be expressed in any frequency unit (eg, MHz unit).

[0160] The specific threshold value may also be, for example, a threshold value related to a measurement result in the UE. The measurement result may also be a received power / received quality (eg, RSRP / RSRQ / SINR) of a DL channel / RS.

[0161] For example, the UE may determine at least one of the following based on the measurement result of each of the plurality of configured carriers: application of Doppler correction using a reference carrier and presence or absence of configuration of a reference carrier.

[0162] For example, the UE may also determine that Doppler correction using the reference carrier is performed on the multiple carriers when the measurement result in each carrier of the multiple carriers is greater than a specific value. For example, the UE may also determine that at least one carrier among the multiple carriers is set as the reference carrier when the measurement result in each carrier of the multiple carriers is greater than a specific value.

[0163] For example, the UE may also determine that Doppler correction using the reference carrier is not performed on the multiple carriers when at least one of the measurement results of the multiple carriers is set to be less than a specific value. For example, the UE may also determine that at least one of the multiple carriers is not set as a reference carrier when at least one of the measurement results of the multiple carriers is set to be less than a specific value.

[0164] The specific threshold may be, for example, a Doppler-related threshold. The Doppler-related threshold may also include at least one of a Doppler value, a moving speed of the UE, and a carrier frequency.

[0165] For example, the UE may determine the application of Doppler correction based on a threshold value related to Doppler in each of a plurality of configured carriers.

[0166] For example, if Doppler correction cannot be performed in the set reference carrier, the UE may determine not to perform Doppler correction using the reference carrier. Whether Doppler correction cannot be performed may also be determined based on at least one of the time interval between reference signals, the moving speed of the UE, and the carrier frequency.

[0167] For example, the UE may determine not to apply Doppler correction using the reference carrier when Doppler correction can be performed based on the frequency of the highest frequency carrier among multiple carriers that are set (i.e., when the UE's moving speed is less than a specific value).

[0168] The specific threshold may be, for example, a threshold related to the distance between base stations to which the UE is connected.

[0169] For example, the UE may determine the application of Doppler correction based on a threshold value related to the distances between the plurality of base stations to which the UE is connected.

[0170] For example, the UE may determine not to perform Doppler correction using the reference carrier when the distance between the base stations is greater than a specific value. For example, the UE may determine that the reference carrier is not set when the distance between the base stations is greater than a specific value.

[0171] For example, the UE may determine not to perform Doppler correction using the reference carrier when the distance between the base stations is less than a specific value. For example, the UE may determine that the reference carrier is not set when the distance between the base stations is less than a specific value.

[0172] The specific value may be pre-defined in the specification, may be set to the UE using higher layer signaling, or may be determined based on the reported capability information of the UE. The specific value may also be expressed in an arbitrary distance unit (eg, km).

[0173] According to the second embodiment described above, the application of Doppler correction can be appropriately notified to the UE using information related to a specific threshold value.

[0174] <Supplement>

[0175] At least one of the above-mentioned embodiments may also be applied only to a UE that reports a specific UE capability (UE capability) or supports the specific UE capability.

[0176] The specific UE capability may also represent at least one of the following:

[0177] ◆Supporting specific processing / operation / control / information for at least one of the above-mentioned embodiments (e.g., Doppler correction using a reference carrier, determination related to Doppler correction based on information related to a specific threshold value).

[0178] ◆Support enhanced frequencies in future wireless communication systems (e.g., 6G).

[0179] ◆The number of carriers supported.

[0180] In addition, the above-mentioned specific UE capabilities can be capabilities that are applied across all frequencies (commonly regardless of frequency), or capabilities by frequency (for example, cell, band, BWP), or capabilities by frequency range (for example, Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or capabilities by subcarrier spacing (SubCarrier Spacing (SCS)).

[0181] In addition, the above-mentioned specific UE capabilities can be capabilities applied across full-duplex modes (commonly regardless of the duplex mode) or capabilities according to duplex modes (for example, time division duplex (TDD) and frequency division duplex (FDD)).

[0182] In addition, at least one of the above embodiments may also be applied when the UE is configured with specific information associated with the above embodiments through high-level signaling. For example, the specific information may also be information indicating Doppler correction using a reference carrier, any RRC parameter for a specific version (e.g., Rel. 19), etc.

[0183] The UE may also apply operations such as Rel.15 / 16 / 17 without supporting at least one of the above-mentioned specific UE capabilities or without being set with the above-mentioned specific information.

[0184] (Note)

[0185] The following inventions are added to one embodiment of the present disclosure.

[0186] [Note 1]

[0187] A terminal comprises: a receiving unit that receives information related to a reference carrier; and a control unit that performs a first Doppler correction in the reference carrier based on the information, and performs a second Doppler correction in a carrier other than the reference carrier based on the information and the first Doppler correction.

[0188] [Note 2]

[0189] The terminal according to Supplementary Note 1, wherein the reference carrier is a carrier with the lowest frequency among a plurality of carriers set for the terminal.

[0190] [Note 3]

[0191] The terminal according to Supplementary Note 1, wherein the reference carrier is a combination of at least two carriers among a plurality of carriers set for the terminal.

[0192] [Note 4]

[0193] The terminal according to Supplementary Note 1, wherein the receiving unit receives information on whether or not the reference carrier is set.

[0194] (Wireless Communication System)

[0195] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0196] Figure 8 1 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0197] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0198] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0199] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0200] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0201] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0202] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0203] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0204] Multiple base stations 10 may also be connected via wired (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) may also be referred to as an IAB node.

[0205] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also 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.

[0206] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0207] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), 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), etc. may be used.

[0208] The radio access scheme may also be referred to as a waveform. In addition, 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 radio access schemes for UL and DL.

[0209] As downlink channels, the wireless communication system 1 may use 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.

[0210] In addition, as uplink channels, 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)) and the like can also be used in the wireless communication system 1.

[0211] User data, high-layer control information, system information block (SIB), etc. are transmitted through PDSCH. User data, high-layer control information, etc. can also be transmitted through PUSCH. In addition, master information block (MIB) can also be transmitted through PBCH.

[0212] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0213] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be rewritten as DL data, and the PUSCH may also be rewritten as UL data.

[0214] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0215] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be rewritten mutually.

[0216] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted through PUCCH. The random access preamble used to establish a connection with a cell can also be transmitted through PRACH.

[0217] In the present disclosure, downlink, uplink, etc. may be expressed without the word “link.” In addition, various channels may be expressed without the word “physical” at the beginning.

[0218] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. As DL-RS, in the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. can also be transmitted.

[0219] 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 SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as SS / PBCH block, SS block (SSB), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0220] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0221] (Base Station)

[0222] Fig. 91 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0223] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0224] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0225] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0226] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0227] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0228] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0229] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0230] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0231] The sending and receiving unit 120 (the sending processing unit 1211 may also) performs processing on the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (for example, RLC retransmission control), the Medium Access Control (MAC) layer (for example, HARQ retransmission control), etc., for data and control information obtained from the control unit 110, and generates a bit string to be sent.

[0232] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (Discrete Fourier Transform (DFT)) processing (as needed), inverse fast Fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0233] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0234] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0235] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing (filtering processing), demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0236] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0237] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0238] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0239] The transmitting and receiving unit 120 may also transmit information related to a reference carrier (specific carrier). The control unit 110 may also use the information to instruct to perform a first Doppler correction in the reference carrier, and use the information and the result of the first Doppler correction to instruct to perform a second Doppler correction in a carrier other than the reference carrier.

[0240] (User Terminal)

[0241] Fig.10 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. In addition, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided in one or more portions.

[0242] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0243] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0244] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0245] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0246] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0247] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0248] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0249] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0250] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0251] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0252] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0253] The transmitting and receiving unit 220 (RF unit 222 ) may perform modulation, filter processing (filtering processing), amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0254] On the other hand, the transmitting and receiving unit 220 (RF unit 222) may perform amplification, filter processing (filter processing), demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230.

[0255] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing (filtering processing), demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0256] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0257] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0258] The transmitting and receiving unit 220 may also receive information related to a reference carrier (a specific carrier). The control unit 210 may also perform a first Doppler correction in the reference carrier based on the information, and perform a second Doppler correction in a carrier other than the reference carrier based on the information and the first Doppler correction (first embodiment).

[0259] The reference carrier may be a carrier having the lowest frequency among a plurality of carriers set for the terminal (first embodiment).

[0260] The reference carrier may be a combination of at least two carriers among a plurality of carriers configured for the terminal (first embodiment).

[0261] The transmitting and receiving unit 220 may receive information on whether or not the reference carrier is set (second embodiment).

[0262] (Hardware Structure)

[0263] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0264] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method thereof is not particularly limited.

[0265] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.11 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0266] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. can be interchangeably used. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0267] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0268] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0269] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0270] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be implemented for other functional blocks.

[0271] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0272] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other suitable storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0273] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. can also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) can also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0274] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0275] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0276] In addition, the base station 10 and the user terminal 20 may also 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), and a field programmable gate array (FPGA), and the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0277] (Variation Example)

[0278] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be rewritten with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0279] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0280] Here, the parameter set may also be a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, a wireless frame structure, a specific filter processing performed by a transmitter and receiver in the frequency domain, a specific windowing processing performed by a transmitter and receiver in the time domain, and the like.

[0281] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0282] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0283] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be replaced with each other.

[0284] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot 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 (e.g., 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0285] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0286] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when 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.

[0287] In addition, when a time slot or a mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0288] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0289] In addition, a long TTI (e.g., normal TTI, subframe, etc.) can also be rewritten as a TTI with a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) can also be rewritten as a TTI with a TTI length shorter than that of the long TTI and longer than 1 ms.

[0290] 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 (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0291] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0292] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0293] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0294] A Bandwidth Part (BWP) (also referred to as a partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, a common RB may also be identified by an index of the RB relative to a common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0295] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0296] At least one of the set BWPs may be activated, and the UE may not assume that a specific signal / channel is transmitted or received outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

[0297] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0298] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0299] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0300] Information, signals, etc. described in this disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0301] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0302] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0303] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0304] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0305] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0306] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0307] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0308] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0309] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0310] 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", "transmission 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", and "panel" can be used interchangeably.

[0311] In the present disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro-micro cell, and micro-micro cell.

[0312] A base station can accommodate one or more (for example, 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 also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0313] In the present disclosure, the base station sending information to the terminal may also be rewritten as the base station instructing the terminal to control / operate based on the information.

[0314] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0315] There are also cases where a mobile station is 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, hand set, user agent, mobile client, client or several other appropriate terms.

[0316] At least one of the base station and the mobile station may also be referred to as a transmission device, a reception device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a moving object, a moving object body, etc.

[0317] The mobile body refers to a movable object, and the moving speed is arbitrary, and of course it also includes the situation where the mobile body stops. The mobile body includes, for example, vehicles, transport vehicles, cars, automatic two-wheeled vehicles (motorcycles), bicycles, connected cars, loading shovels, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, trolleys, rickshaws, ships (ships and other watercrafts), airplanes, rockets, artificial satellites, drones, multi-rotor aircraft, quadcopters, balloons and objects carried on them, but are not limited to these. In addition, the mobile body can also be a mobile body that drives autonomously based on operating instructions.

[0318] The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0319] Fig.121 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed 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.

[0320] The driving unit 41 is composed of at least one of an engine, a motor, or a combination of an engine and a motor. The steering unit 42 is composed of at least a steering wheel (also called a handlebar), and steers 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.

[0321] The electronic control unit 49 is composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals from various sensors 50-58 provided in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be referred to as an ECU (Electronic Control Unit).

[0322] Signals from various sensors 50-58 include a current signal from a current sensor 50 for sensing the current of a motor, a speed signal of the front wheels 46 / rear wheels 47 obtained by a speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by other sensors 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 an accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of a brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of a shift lever 45 obtained by a shift lever sensor 57, a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58, and the like.

[0323] The information service unit 59 is composed of various devices such as a vehicle navigation system, an audio system, a speaker, 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 provides various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40 using information obtained from an external device via the communication module 60, etc.

[0324] The information service unit 59 may include input devices for accepting input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.), and may also include output devices for implementing output to the outside (e.g., display, speaker, LED light, touch panel, etc.).

[0325] The driving assistance system unit 64 is composed of various devices such as millimeter wave radar, light detection and ranging (LiDAR), camera, positioning locator (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., high-precision (High Definition (HD))) map, autonomous vehicle (Autonomous Vehicle (AV)) map, etc.), gyroscope system (e.g., inertial measurement unit (Inertial Measurement Unit (IMU))), inertial navigation unit (Inertial Navigation System (INS))), artificial intelligence (Artificial Intelligence (AI)) chip, AI processor, etc., for providing functions for preventing accidents before they happen or reducing the driver's driving load, and one or more ECUs for controlling these devices. In addition, the driving assistance system unit 64 sends and receives various information via the communication module 60 and realizes driving assistance function or autonomous driving function.

[0326] The communication module 60 can communicate with the microprocessor 61 and the components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) between the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the microprocessor 61 and the memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58 of the vehicle 40 via the communication port 63.

[0327] The communication module 60 can be controlled by the microprocessor 61 of the electronic control unit 49, and is a communication device that can communicate with an external device. For example, various information is sent and received with the external device via wireless communication. The communication module 60 can be located either inside or outside the electronic control unit 49. The external device can also be, for example, the above-mentioned base station 10, user terminal 20, etc. In addition, the communication module 60 can also be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (it can also function as at least one of the base station 10 and user terminal 20).

[0328] The communication module 60 may also transmit at least one of the signals from the 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 also be referred to as an input unit that receives input. For example, the PUSCH transmitted through the communication module 60 may also include information based on the above input.

[0329] The communication module 60 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) transmitted from an external device, and displays it to the information service unit 59 provided in the vehicle. The information service unit 59 may also be referred to as an output unit for outputting information (for example, outputting information to a display, a speaker, etc. based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0330] In addition, the communication module 60 stores various information received from the external device in the memory 62 that can be used by the microprocessor 61. The microprocessor 61 can also control the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, and various sensors 50-58 of the vehicle 40 based on the information stored in the memory 62.

[0331] In addition, the base station in the present disclosure may also be rewritten as a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink", "downlink", etc. may also be rewritten as terms corresponding to communication between terminals (for example, "sidelink"). For example, uplink channels, downlink channels, etc. may also be rewritten as sidelink channels.

[0332] Likewise, the user terminal in the present disclosure may be rewritten as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0333] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes by its upper node (uppernode) depending on the situation. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, considering the Mobility Management Entity (MME)), the Serving-Gateway (S-GW), etc., but not limited to these) or a combination thereof.

[0334] The various methods / implementations described in this disclosure may be used alone or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, timings, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the method described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0335] The various modes / implementations described in the present disclosure may also be applied to 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 a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New Radio Access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on these enhancements, corrections, production or regulations, etc. In addition, multiple systems can also be combined (for example, LTE or LTE-A, combination with 5G, etc.) for application.

[0336] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0337] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0338] The term "determining" used in the present disclosure may include a variety of actions. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. are considered to be "determining".

[0339] In addition, "judgment (decision)" may also be a situation where receiving (for example, receiving information), sending (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0340] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as a situation where "judgment (decision)" is performed. That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as a situation where "judgment (decision)" is performed.

[0341] In addition, "judge (decide)" can also be rewritten as "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0342] The “maximum transmit power” recorded in the present disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated maximum transmit power).

[0343] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be rewritten as "access".

[0344] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as being "connected" or "combined" to each other using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0345] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same manner as "different".

[0346] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0347] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0348] In the present disclosure, "below", "less than", "above", "more than", "equal to", etc. can also be rephrased with each other. In addition, in the present disclosure, sentences meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. can also be rephrased with each other without limiting the original degree, comparative degree, and superlative degree. In addition, in the present disclosure, sentences meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. can also be rephrased with each other as expressions attached with "ith" (i is an arbitrary integer) without limiting the original degree, comparative degree, and superlative degree (for example, "highest" can also be rephrased with "i-th highest").

[0349] In the present disclosure, “of,” “for,” “regarding,” “related to,” “associated with,” etc. may be rephrased.

[0350] The invention involved in the present disclosure is described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: A receiving unit, receiving information related to a reference carrier; and The control unit performs a first Doppler correction in the reference carrier based on the information, and performs a second Doppler correction in a carrier other than the reference carrier based on the information and the first Doppler correction.

2. The terminal according to claim 1, wherein: The reference carrier is a carrier having the lowest frequency among a plurality of carriers set for the terminal.

3. The terminal according to claim 1, wherein: The reference carrier is a combination of at least two carriers among a plurality of carriers configured for the terminal.

4. The terminal according to claim 1, wherein: The receiving unit receives information on whether or not the reference carrier is set.

5. A wireless communication method of a terminal, comprising: The step of receiving information related to a reference carrier; and A step of performing a first Doppler correction in the reference carrier based on the information, and performing a second Doppler correction in a carrier other than the reference carrier based on the information and the first Doppler correction.

6. A base station, comprising: A sending unit, sending information related to the reference carrier; and The control unit instructs to perform a first Doppler correction in the reference carrier using the information, and instructs to perform a second Doppler correction in a carrier other than the reference carrier using the information and a result of the first Doppler correction.

Images